1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Syscall interface to knfsd. 4 * 5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 6 */ 7 8 #include <linux/slab.h> 9 #include <linux/namei.h> 10 #include <linux/ctype.h> 11 #include <linux/fs_context.h> 12 13 #include <linux/sunrpc/svcsock.h> 14 #include <linux/lockd/lockd.h> 15 #include <linux/sunrpc/addr.h> 16 #include <linux/sunrpc/gss_api.h> 17 #include <linux/sunrpc/gss_krb5_enctypes.h> 18 #include <linux/sunrpc/rpc_pipe_fs.h> 19 #include <linux/module.h> 20 #include <linux/fsnotify.h> 21 22 #include "idmap.h" 23 #include "nfsd.h" 24 #include "cache.h" 25 #include "state.h" 26 #include "netns.h" 27 #include "pnfs.h" 28 #include "filecache.h" 29 30 /* 31 * We have a single directory with several nodes in it. 32 */ 33 enum { 34 NFSD_Root = 1, 35 NFSD_List, 36 NFSD_Export_Stats, 37 NFSD_Export_features, 38 NFSD_Fh, 39 NFSD_FO_UnlockIP, 40 NFSD_FO_UnlockFS, 41 NFSD_Threads, 42 NFSD_Pool_Threads, 43 NFSD_Pool_Stats, 44 NFSD_Reply_Cache_Stats, 45 NFSD_Versions, 46 NFSD_Ports, 47 NFSD_MaxBlkSize, 48 NFSD_MaxConnections, 49 NFSD_Filecache, 50 NFSD_SupportedEnctypes, 51 /* 52 * The below MUST come last. Otherwise we leave a hole in nfsd_files[] 53 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops 54 */ 55 #ifdef CONFIG_NFSD_V4 56 NFSD_Leasetime, 57 NFSD_Gracetime, 58 NFSD_RecoveryDir, 59 NFSD_V4EndGrace, 60 #endif 61 NFSD_MaxReserved 62 }; 63 64 /* 65 * write() for these nodes. 66 */ 67 static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 68 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); 69 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); 70 static ssize_t write_threads(struct file *file, char *buf, size_t size); 71 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 72 static ssize_t write_versions(struct file *file, char *buf, size_t size); 73 static ssize_t write_ports(struct file *file, char *buf, size_t size); 74 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 75 static ssize_t write_maxconn(struct file *file, char *buf, size_t size); 76 #ifdef CONFIG_NFSD_V4 77 static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 78 static ssize_t write_gracetime(struct file *file, char *buf, size_t size); 79 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 80 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size); 81 #endif 82 83 static ssize_t (*const write_op[])(struct file *, char *, size_t) = { 84 [NFSD_Fh] = write_filehandle, 85 [NFSD_FO_UnlockIP] = write_unlock_ip, 86 [NFSD_FO_UnlockFS] = write_unlock_fs, 87 [NFSD_Threads] = write_threads, 88 [NFSD_Pool_Threads] = write_pool_threads, 89 [NFSD_Versions] = write_versions, 90 [NFSD_Ports] = write_ports, 91 [NFSD_MaxBlkSize] = write_maxblksize, 92 [NFSD_MaxConnections] = write_maxconn, 93 #ifdef CONFIG_NFSD_V4 94 [NFSD_Leasetime] = write_leasetime, 95 [NFSD_Gracetime] = write_gracetime, 96 [NFSD_RecoveryDir] = write_recoverydir, 97 [NFSD_V4EndGrace] = write_v4_end_grace, 98 #endif 99 }; 100 101 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 102 { 103 ino_t ino = file_inode(file)->i_ino; 104 char *data; 105 ssize_t rv; 106 107 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 108 return -EINVAL; 109 110 data = simple_transaction_get(file, buf, size); 111 if (IS_ERR(data)) 112 return PTR_ERR(data); 113 114 rv = write_op[ino](file, data, size); 115 if (rv >= 0) { 116 simple_transaction_set(file, rv); 117 rv = size; 118 } 119 return rv; 120 } 121 122 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) 123 { 124 if (! file->private_data) { 125 /* An attempt to read a transaction file without writing 126 * causes a 0-byte write so that the file can return 127 * state information 128 */ 129 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); 130 if (rv < 0) 131 return rv; 132 } 133 return simple_transaction_read(file, buf, size, pos); 134 } 135 136 static const struct file_operations transaction_ops = { 137 .write = nfsctl_transaction_write, 138 .read = nfsctl_transaction_read, 139 .release = simple_transaction_release, 140 .llseek = default_llseek, 141 }; 142 143 static int exports_net_open(struct net *net, struct file *file) 144 { 145 int err; 146 struct seq_file *seq; 147 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 148 149 err = seq_open(file, &nfs_exports_op); 150 if (err) 151 return err; 152 153 seq = file->private_data; 154 seq->private = nn->svc_export_cache; 155 return 0; 156 } 157 158 static int exports_proc_open(struct inode *inode, struct file *file) 159 { 160 return exports_net_open(current->nsproxy->net_ns, file); 161 } 162 163 static const struct proc_ops exports_proc_ops = { 164 .proc_open = exports_proc_open, 165 .proc_read = seq_read, 166 .proc_lseek = seq_lseek, 167 .proc_release = seq_release, 168 }; 169 170 static int exports_nfsd_open(struct inode *inode, struct file *file) 171 { 172 return exports_net_open(inode->i_sb->s_fs_info, file); 173 } 174 175 static const struct file_operations exports_nfsd_operations = { 176 .open = exports_nfsd_open, 177 .read = seq_read, 178 .llseek = seq_lseek, 179 .release = seq_release, 180 }; 181 182 static int export_features_show(struct seq_file *m, void *v) 183 { 184 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS); 185 return 0; 186 } 187 188 DEFINE_SHOW_ATTRIBUTE(export_features); 189 190 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE) 191 static int supported_enctypes_show(struct seq_file *m, void *v) 192 { 193 seq_printf(m, KRB5_SUPPORTED_ENCTYPES); 194 return 0; 195 } 196 197 DEFINE_SHOW_ATTRIBUTE(supported_enctypes); 198 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */ 199 200 static const struct file_operations pool_stats_operations = { 201 .open = nfsd_pool_stats_open, 202 .read = seq_read, 203 .llseek = seq_lseek, 204 .release = nfsd_pool_stats_release, 205 }; 206 207 DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats); 208 209 DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats); 210 211 /*----------------------------------------------------------------------------*/ 212 /* 213 * payload - write methods 214 */ 215 216 static inline struct net *netns(struct file *file) 217 { 218 return file_inode(file)->i_sb->s_fs_info; 219 } 220 221 /* 222 * write_unlock_ip - Release all locks used by a client 223 * 224 * Experimental. 225 * 226 * Input: 227 * buf: '\n'-terminated C string containing a 228 * presentation format IP address 229 * size: length of C string in @buf 230 * Output: 231 * On success: returns zero if all specified locks were released; 232 * returns one if one or more locks were not released 233 * On error: return code is negative errno value 234 */ 235 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) 236 { 237 struct sockaddr_storage address; 238 struct sockaddr *sap = (struct sockaddr *)&address; 239 size_t salen = sizeof(address); 240 char *fo_path; 241 struct net *net = netns(file); 242 243 /* sanity check */ 244 if (size == 0) 245 return -EINVAL; 246 247 if (buf[size-1] != '\n') 248 return -EINVAL; 249 250 fo_path = buf; 251 if (qword_get(&buf, fo_path, size) < 0) 252 return -EINVAL; 253 254 if (rpc_pton(net, fo_path, size, sap, salen) == 0) 255 return -EINVAL; 256 257 return nlmsvc_unlock_all_by_ip(sap); 258 } 259 260 /* 261 * write_unlock_fs - Release all locks on a local file system 262 * 263 * Experimental. 264 * 265 * Input: 266 * buf: '\n'-terminated C string containing the 267 * absolute pathname of a local file system 268 * size: length of C string in @buf 269 * Output: 270 * On success: returns zero if all specified locks were released; 271 * returns one if one or more locks were not released 272 * On error: return code is negative errno value 273 */ 274 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size) 275 { 276 struct path path; 277 char *fo_path; 278 int error; 279 280 /* sanity check */ 281 if (size == 0) 282 return -EINVAL; 283 284 if (buf[size-1] != '\n') 285 return -EINVAL; 286 287 fo_path = buf; 288 if (qword_get(&buf, fo_path, size) < 0) 289 return -EINVAL; 290 291 error = kern_path(fo_path, 0, &path); 292 if (error) 293 return error; 294 295 /* 296 * XXX: Needs better sanity checking. Otherwise we could end up 297 * releasing locks on the wrong file system. 298 * 299 * For example: 300 * 1. Does the path refer to a directory? 301 * 2. Is that directory a mount point, or 302 * 3. Is that directory the root of an exported file system? 303 */ 304 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb); 305 306 path_put(&path); 307 return error; 308 } 309 310 /* 311 * write_filehandle - Get a variable-length NFS file handle by path 312 * 313 * On input, the buffer contains a '\n'-terminated C string comprised of 314 * three alphanumeric words separated by whitespace. The string may 315 * contain escape sequences. 316 * 317 * Input: 318 * buf: 319 * domain: client domain name 320 * path: export pathname 321 * maxsize: numeric maximum size of 322 * @buf 323 * size: length of C string in @buf 324 * Output: 325 * On success: passed-in buffer filled with '\n'-terminated C 326 * string containing a ASCII hex text version 327 * of the NFS file handle; 328 * return code is the size in bytes of the string 329 * On error: return code is negative errno value 330 */ 331 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 332 { 333 char *dname, *path; 334 int maxsize; 335 char *mesg = buf; 336 int len; 337 struct auth_domain *dom; 338 struct knfsd_fh fh; 339 340 if (size == 0) 341 return -EINVAL; 342 343 if (buf[size-1] != '\n') 344 return -EINVAL; 345 buf[size-1] = 0; 346 347 dname = mesg; 348 len = qword_get(&mesg, dname, size); 349 if (len <= 0) 350 return -EINVAL; 351 352 path = dname+len+1; 353 len = qword_get(&mesg, path, size); 354 if (len <= 0) 355 return -EINVAL; 356 357 len = get_int(&mesg, &maxsize); 358 if (len) 359 return len; 360 361 if (maxsize < NFS_FHSIZE) 362 return -EINVAL; 363 maxsize = min(maxsize, NFS3_FHSIZE); 364 365 if (qword_get(&mesg, mesg, size)>0) 366 return -EINVAL; 367 368 /* we have all the words, they are in buf.. */ 369 dom = unix_domain_find(dname); 370 if (!dom) 371 return -ENOMEM; 372 373 len = exp_rootfh(netns(file), dom, path, &fh, maxsize); 374 auth_domain_put(dom); 375 if (len) 376 return len; 377 378 mesg = buf; 379 len = SIMPLE_TRANSACTION_LIMIT; 380 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size); 381 mesg[-1] = '\n'; 382 return mesg - buf; 383 } 384 385 /* 386 * write_threads - Start NFSD, or report the current number of running threads 387 * 388 * Input: 389 * buf: ignored 390 * size: zero 391 * Output: 392 * On success: passed-in buffer filled with '\n'-terminated C 393 * string numeric value representing the number of 394 * running NFSD threads; 395 * return code is the size in bytes of the string 396 * On error: return code is zero 397 * 398 * OR 399 * 400 * Input: 401 * buf: C string containing an unsigned 402 * integer value representing the 403 * number of NFSD threads to start 404 * size: non-zero length of C string in @buf 405 * Output: 406 * On success: NFS service is started; 407 * passed-in buffer filled with '\n'-terminated C 408 * string numeric value representing the number of 409 * running NFSD threads; 410 * return code is the size in bytes of the string 411 * On error: return code is zero or a negative errno value 412 */ 413 static ssize_t write_threads(struct file *file, char *buf, size_t size) 414 { 415 char *mesg = buf; 416 int rv; 417 struct net *net = netns(file); 418 419 if (size > 0) { 420 int newthreads; 421 rv = get_int(&mesg, &newthreads); 422 if (rv) 423 return rv; 424 if (newthreads < 0) 425 return -EINVAL; 426 rv = nfsd_svc(newthreads, net, file->f_cred); 427 if (rv < 0) 428 return rv; 429 } else 430 rv = nfsd_nrthreads(net); 431 432 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); 433 } 434 435 /* 436 * write_pool_threads - Set or report the current number of threads per pool 437 * 438 * Input: 439 * buf: ignored 440 * size: zero 441 * 442 * OR 443 * 444 * Input: 445 * buf: C string containing whitespace- 446 * separated unsigned integer values 447 * representing the number of NFSD 448 * threads to start in each pool 449 * size: non-zero length of C string in @buf 450 * Output: 451 * On success: passed-in buffer filled with '\n'-terminated C 452 * string containing integer values representing the 453 * number of NFSD threads in each pool; 454 * return code is the size in bytes of the string 455 * On error: return code is zero or a negative errno value 456 */ 457 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 458 { 459 /* if size > 0, look for an array of number of threads per node 460 * and apply them then write out number of threads per node as reply 461 */ 462 char *mesg = buf; 463 int i; 464 int rv; 465 int len; 466 int npools; 467 int *nthreads; 468 struct net *net = netns(file); 469 470 mutex_lock(&nfsd_mutex); 471 npools = nfsd_nrpools(net); 472 if (npools == 0) { 473 /* 474 * NFS is shut down. The admin can start it by 475 * writing to the threads file but NOT the pool_threads 476 * file, sorry. Report zero threads. 477 */ 478 mutex_unlock(&nfsd_mutex); 479 strcpy(buf, "0\n"); 480 return strlen(buf); 481 } 482 483 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); 484 rv = -ENOMEM; 485 if (nthreads == NULL) 486 goto out_free; 487 488 if (size > 0) { 489 for (i = 0; i < npools; i++) { 490 rv = get_int(&mesg, &nthreads[i]); 491 if (rv == -ENOENT) 492 break; /* fewer numbers than pools */ 493 if (rv) 494 goto out_free; /* syntax error */ 495 rv = -EINVAL; 496 if (nthreads[i] < 0) 497 goto out_free; 498 } 499 rv = nfsd_set_nrthreads(i, nthreads, net); 500 if (rv) 501 goto out_free; 502 } 503 504 rv = nfsd_get_nrthreads(npools, nthreads, net); 505 if (rv) 506 goto out_free; 507 508 mesg = buf; 509 size = SIMPLE_TRANSACTION_LIMIT; 510 for (i = 0; i < npools && size > 0; i++) { 511 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 512 len = strlen(mesg); 513 size -= len; 514 mesg += len; 515 } 516 rv = mesg - buf; 517 out_free: 518 kfree(nthreads); 519 mutex_unlock(&nfsd_mutex); 520 return rv; 521 } 522 523 static ssize_t 524 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining, 525 const char *sep, unsigned vers, int minor) 526 { 527 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u"; 528 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST); 529 530 if (vers == 4 && minor >= 0 && 531 !nfsd_minorversion(nn, minor, NFSD_TEST)) 532 supported = false; 533 if (minor == 0 && supported) 534 /* 535 * special case for backward compatability. 536 * +4.0 is never reported, it is implied by 537 * +4, unless -4.0 is present. 538 */ 539 return 0; 540 return snprintf(buf, remaining, format, sep, 541 supported ? '+' : '-', vers, minor); 542 } 543 544 static ssize_t __write_versions(struct file *file, char *buf, size_t size) 545 { 546 char *mesg = buf; 547 char *vers, *minorp, sign; 548 int len, num, remaining; 549 ssize_t tlen = 0; 550 char *sep; 551 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 552 553 if (size>0) { 554 if (nn->nfsd_serv) 555 /* Cannot change versions without updating 556 * nn->nfsd_serv->sv_xdrsize, and reallocing 557 * rq_argp and rq_resp 558 */ 559 return -EBUSY; 560 if (buf[size-1] != '\n') 561 return -EINVAL; 562 buf[size-1] = 0; 563 564 vers = mesg; 565 len = qword_get(&mesg, vers, size); 566 if (len <= 0) return -EINVAL; 567 do { 568 enum vers_op cmd; 569 unsigned minor; 570 sign = *vers; 571 if (sign == '+' || sign == '-') 572 num = simple_strtol((vers+1), &minorp, 0); 573 else 574 num = simple_strtol(vers, &minorp, 0); 575 if (*minorp == '.') { 576 if (num != 4) 577 return -EINVAL; 578 if (kstrtouint(minorp+1, 0, &minor) < 0) 579 return -EINVAL; 580 } 581 582 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET; 583 switch(num) { 584 #ifdef CONFIG_NFSD_V2 585 case 2: 586 #endif 587 case 3: 588 nfsd_vers(nn, num, cmd); 589 break; 590 case 4: 591 if (*minorp == '.') { 592 if (nfsd_minorversion(nn, minor, cmd) < 0) 593 return -EINVAL; 594 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) { 595 /* 596 * Either we have +4 and no minors are enabled, 597 * or we have -4 and at least one minor is enabled. 598 * In either case, propagate 'cmd' to all minors. 599 */ 600 minor = 0; 601 while (nfsd_minorversion(nn, minor, cmd) >= 0) 602 minor++; 603 } 604 break; 605 default: 606 /* Ignore requests to disable non-existent versions */ 607 if (cmd == NFSD_SET) 608 return -EINVAL; 609 } 610 vers += len + 1; 611 } while ((len = qword_get(&mesg, vers, size)) > 0); 612 /* If all get turned off, turn them back on, as 613 * having no versions is BAD 614 */ 615 nfsd_reset_versions(nn); 616 } 617 618 /* Now write current state into reply buffer */ 619 sep = ""; 620 remaining = SIMPLE_TRANSACTION_LIMIT; 621 for (num=2 ; num <= 4 ; num++) { 622 int minor; 623 if (!nfsd_vers(nn, num, NFSD_AVAIL)) 624 continue; 625 626 minor = -1; 627 do { 628 len = nfsd_print_version_support(nn, buf, remaining, 629 sep, num, minor); 630 if (len >= remaining) 631 goto out; 632 remaining -= len; 633 buf += len; 634 tlen += len; 635 minor++; 636 if (len) 637 sep = " "; 638 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION); 639 } 640 out: 641 len = snprintf(buf, remaining, "\n"); 642 if (len >= remaining) 643 return -EINVAL; 644 return tlen + len; 645 } 646 647 /* 648 * write_versions - Set or report the available NFS protocol versions 649 * 650 * Input: 651 * buf: ignored 652 * size: zero 653 * Output: 654 * On success: passed-in buffer filled with '\n'-terminated C 655 * string containing positive or negative integer 656 * values representing the current status of each 657 * protocol version; 658 * return code is the size in bytes of the string 659 * On error: return code is zero or a negative errno value 660 * 661 * OR 662 * 663 * Input: 664 * buf: C string containing whitespace- 665 * separated positive or negative 666 * integer values representing NFS 667 * protocol versions to enable ("+n") 668 * or disable ("-n") 669 * size: non-zero length of C string in @buf 670 * Output: 671 * On success: status of zero or more protocol versions has 672 * been updated; passed-in buffer filled with 673 * '\n'-terminated C string containing positive 674 * or negative integer values representing the 675 * current status of each protocol version; 676 * return code is the size in bytes of the string 677 * On error: return code is zero or a negative errno value 678 */ 679 static ssize_t write_versions(struct file *file, char *buf, size_t size) 680 { 681 ssize_t rv; 682 683 mutex_lock(&nfsd_mutex); 684 rv = __write_versions(file, buf, size); 685 mutex_unlock(&nfsd_mutex); 686 return rv; 687 } 688 689 /* 690 * Zero-length write. Return a list of NFSD's current listener 691 * transports. 692 */ 693 static ssize_t __write_ports_names(char *buf, struct net *net) 694 { 695 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 696 697 if (nn->nfsd_serv == NULL) 698 return 0; 699 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); 700 } 701 702 /* 703 * A single 'fd' number was written, in which case it must be for 704 * a socket of a supported family/protocol, and we use it as an 705 * nfsd listener. 706 */ 707 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred) 708 { 709 char *mesg = buf; 710 int fd, err; 711 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 712 713 err = get_int(&mesg, &fd); 714 if (err != 0 || fd < 0) 715 return -EINVAL; 716 717 if (svc_alien_sock(net, fd)) { 718 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__); 719 return -EINVAL; 720 } 721 722 err = nfsd_create_serv(net); 723 if (err != 0) 724 return err; 725 726 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred); 727 728 if (err >= 0 && 729 !nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1)) 730 svc_get(nn->nfsd_serv); 731 732 nfsd_put(net); 733 return err; 734 } 735 736 /* 737 * A transport listener is added by writing it's transport name and 738 * a port number. 739 */ 740 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred) 741 { 742 char transport[16]; 743 struct svc_xprt *xprt; 744 int port, err; 745 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 746 747 if (sscanf(buf, "%15s %5u", transport, &port) != 2) 748 return -EINVAL; 749 750 if (port < 1 || port > USHRT_MAX) 751 return -EINVAL; 752 753 err = nfsd_create_serv(net); 754 if (err != 0) 755 return err; 756 757 err = svc_xprt_create(nn->nfsd_serv, transport, net, 758 PF_INET, port, SVC_SOCK_ANONYMOUS, cred); 759 if (err < 0) 760 goto out_err; 761 762 err = svc_xprt_create(nn->nfsd_serv, transport, net, 763 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred); 764 if (err < 0 && err != -EAFNOSUPPORT) 765 goto out_close; 766 767 if (!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1)) 768 svc_get(nn->nfsd_serv); 769 770 nfsd_put(net); 771 return 0; 772 out_close: 773 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port); 774 if (xprt != NULL) { 775 svc_xprt_close(xprt); 776 svc_xprt_put(xprt); 777 } 778 out_err: 779 nfsd_put(net); 780 return err; 781 } 782 783 static ssize_t __write_ports(struct file *file, char *buf, size_t size, 784 struct net *net) 785 { 786 if (size == 0) 787 return __write_ports_names(buf, net); 788 789 if (isdigit(buf[0])) 790 return __write_ports_addfd(buf, net, file->f_cred); 791 792 if (isalpha(buf[0])) 793 return __write_ports_addxprt(buf, net, file->f_cred); 794 795 return -EINVAL; 796 } 797 798 /* 799 * write_ports - Pass a socket file descriptor or transport name to listen on 800 * 801 * Input: 802 * buf: ignored 803 * size: zero 804 * Output: 805 * On success: passed-in buffer filled with a '\n'-terminated C 806 * string containing a whitespace-separated list of 807 * named NFSD listeners; 808 * return code is the size in bytes of the string 809 * On error: return code is zero or a negative errno value 810 * 811 * OR 812 * 813 * Input: 814 * buf: C string containing an unsigned 815 * integer value representing a bound 816 * but unconnected socket that is to be 817 * used as an NFSD listener; listen(3) 818 * must be called for a SOCK_STREAM 819 * socket, otherwise it is ignored 820 * size: non-zero length of C string in @buf 821 * Output: 822 * On success: NFS service is started; 823 * passed-in buffer filled with a '\n'-terminated C 824 * string containing a unique alphanumeric name of 825 * the listener; 826 * return code is the size in bytes of the string 827 * On error: return code is a negative errno value 828 * 829 * OR 830 * 831 * Input: 832 * buf: C string containing a transport 833 * name and an unsigned integer value 834 * representing the port to listen on, 835 * separated by whitespace 836 * size: non-zero length of C string in @buf 837 * Output: 838 * On success: returns zero; NFS service is started 839 * On error: return code is a negative errno value 840 */ 841 static ssize_t write_ports(struct file *file, char *buf, size_t size) 842 { 843 ssize_t rv; 844 845 mutex_lock(&nfsd_mutex); 846 rv = __write_ports(file, buf, size, netns(file)); 847 mutex_unlock(&nfsd_mutex); 848 return rv; 849 } 850 851 852 int nfsd_max_blksize; 853 854 /* 855 * write_maxblksize - Set or report the current NFS blksize 856 * 857 * Input: 858 * buf: ignored 859 * size: zero 860 * 861 * OR 862 * 863 * Input: 864 * buf: C string containing an unsigned 865 * integer value representing the new 866 * NFS blksize 867 * size: non-zero length of C string in @buf 868 * Output: 869 * On success: passed-in buffer filled with '\n'-terminated C string 870 * containing numeric value of the current NFS blksize 871 * setting; 872 * return code is the size in bytes of the string 873 * On error: return code is zero or a negative errno value 874 */ 875 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 876 { 877 char *mesg = buf; 878 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 879 880 if (size > 0) { 881 int bsize; 882 int rv = get_int(&mesg, &bsize); 883 if (rv) 884 return rv; 885 /* force bsize into allowed range and 886 * required alignment. 887 */ 888 bsize = max_t(int, bsize, 1024); 889 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE); 890 bsize &= ~(1024-1); 891 mutex_lock(&nfsd_mutex); 892 if (nn->nfsd_serv) { 893 mutex_unlock(&nfsd_mutex); 894 return -EBUSY; 895 } 896 nfsd_max_blksize = bsize; 897 mutex_unlock(&nfsd_mutex); 898 } 899 900 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 901 nfsd_max_blksize); 902 } 903 904 /* 905 * write_maxconn - Set or report the current max number of connections 906 * 907 * Input: 908 * buf: ignored 909 * size: zero 910 * OR 911 * 912 * Input: 913 * buf: C string containing an unsigned 914 * integer value representing the new 915 * number of max connections 916 * size: non-zero length of C string in @buf 917 * Output: 918 * On success: passed-in buffer filled with '\n'-terminated C string 919 * containing numeric value of max_connections setting 920 * for this net namespace; 921 * return code is the size in bytes of the string 922 * On error: return code is zero or a negative errno value 923 */ 924 static ssize_t write_maxconn(struct file *file, char *buf, size_t size) 925 { 926 char *mesg = buf; 927 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 928 unsigned int maxconn = nn->max_connections; 929 930 if (size > 0) { 931 int rv = get_uint(&mesg, &maxconn); 932 933 if (rv) 934 return rv; 935 nn->max_connections = maxconn; 936 } 937 938 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn); 939 } 940 941 #ifdef CONFIG_NFSD_V4 942 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, 943 time64_t *time, struct nfsd_net *nn) 944 { 945 char *mesg = buf; 946 int rv, i; 947 948 if (size > 0) { 949 if (nn->nfsd_serv) 950 return -EBUSY; 951 rv = get_int(&mesg, &i); 952 if (rv) 953 return rv; 954 /* 955 * Some sanity checking. We don't have a reason for 956 * these particular numbers, but problems with the 957 * extremes are: 958 * - Too short: the briefest network outage may 959 * cause clients to lose all their locks. Also, 960 * the frequent polling may be wasteful. 961 * - Too long: do you really want reboot recovery 962 * to take more than an hour? Or to make other 963 * clients wait an hour before being able to 964 * revoke a dead client's locks? 965 */ 966 if (i < 10 || i > 3600) 967 return -EINVAL; 968 *time = i; 969 } 970 971 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time); 972 } 973 974 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, 975 time64_t *time, struct nfsd_net *nn) 976 { 977 ssize_t rv; 978 979 mutex_lock(&nfsd_mutex); 980 rv = __nfsd4_write_time(file, buf, size, time, nn); 981 mutex_unlock(&nfsd_mutex); 982 return rv; 983 } 984 985 /* 986 * write_leasetime - Set or report the current NFSv4 lease time 987 * 988 * Input: 989 * buf: ignored 990 * size: zero 991 * 992 * OR 993 * 994 * Input: 995 * buf: C string containing an unsigned 996 * integer value representing the new 997 * NFSv4 lease expiry time 998 * size: non-zero length of C string in @buf 999 * Output: 1000 * On success: passed-in buffer filled with '\n'-terminated C 1001 * string containing unsigned integer value of the 1002 * current lease expiry time; 1003 * return code is the size in bytes of the string 1004 * On error: return code is zero or a negative errno value 1005 */ 1006 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 1007 { 1008 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1009 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn); 1010 } 1011 1012 /* 1013 * write_gracetime - Set or report current NFSv4 grace period time 1014 * 1015 * As above, but sets the time of the NFSv4 grace period. 1016 * 1017 * Note this should never be set to less than the *previous* 1018 * lease-period time, but we don't try to enforce this. (In the common 1019 * case (a new boot), we don't know what the previous lease time was 1020 * anyway.) 1021 */ 1022 static ssize_t write_gracetime(struct file *file, char *buf, size_t size) 1023 { 1024 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1025 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn); 1026 } 1027 1028 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size, 1029 struct nfsd_net *nn) 1030 { 1031 char *mesg = buf; 1032 char *recdir; 1033 int len, status; 1034 1035 if (size > 0) { 1036 if (nn->nfsd_serv) 1037 return -EBUSY; 1038 if (size > PATH_MAX || buf[size-1] != '\n') 1039 return -EINVAL; 1040 buf[size-1] = 0; 1041 1042 recdir = mesg; 1043 len = qword_get(&mesg, recdir, size); 1044 if (len <= 0) 1045 return -EINVAL; 1046 1047 status = nfs4_reset_recoverydir(recdir); 1048 if (status) 1049 return status; 1050 } 1051 1052 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 1053 nfs4_recoverydir()); 1054 } 1055 1056 /* 1057 * write_recoverydir - Set or report the pathname of the recovery directory 1058 * 1059 * Input: 1060 * buf: ignored 1061 * size: zero 1062 * 1063 * OR 1064 * 1065 * Input: 1066 * buf: C string containing the pathname 1067 * of the directory on a local file 1068 * system containing permanent NFSv4 1069 * recovery data 1070 * size: non-zero length of C string in @buf 1071 * Output: 1072 * On success: passed-in buffer filled with '\n'-terminated C string 1073 * containing the current recovery pathname setting; 1074 * return code is the size in bytes of the string 1075 * On error: return code is zero or a negative errno value 1076 */ 1077 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1078 { 1079 ssize_t rv; 1080 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1081 1082 mutex_lock(&nfsd_mutex); 1083 rv = __write_recoverydir(file, buf, size, nn); 1084 mutex_unlock(&nfsd_mutex); 1085 return rv; 1086 } 1087 1088 /* 1089 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager 1090 * 1091 * Input: 1092 * buf: ignored 1093 * size: zero 1094 * OR 1095 * 1096 * Input: 1097 * buf: any value 1098 * size: non-zero length of C string in @buf 1099 * Output: 1100 * passed-in buffer filled with "Y" or "N" with a newline 1101 * and NULL-terminated C string. This indicates whether 1102 * the grace period has ended in the current net 1103 * namespace. Return code is the size in bytes of the 1104 * string. Writing a string that starts with 'Y', 'y', or 1105 * '1' to the file will end the grace period for nfsd's v4 1106 * lock manager. 1107 */ 1108 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size) 1109 { 1110 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1111 1112 if (size > 0) { 1113 switch(buf[0]) { 1114 case 'Y': 1115 case 'y': 1116 case '1': 1117 if (!nn->nfsd_serv) 1118 return -EBUSY; 1119 nfsd4_end_grace(nn); 1120 break; 1121 default: 1122 return -EINVAL; 1123 } 1124 } 1125 1126 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n", 1127 nn->grace_ended ? 'Y' : 'N'); 1128 } 1129 1130 #endif 1131 1132 /*----------------------------------------------------------------------------*/ 1133 /* 1134 * populating the filesystem. 1135 */ 1136 1137 /* Basically copying rpc_get_inode. */ 1138 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode) 1139 { 1140 struct inode *inode = new_inode(sb); 1141 if (!inode) 1142 return NULL; 1143 /* Following advice from simple_fill_super documentation: */ 1144 inode->i_ino = iunique(sb, NFSD_MaxReserved); 1145 inode->i_mode = mode; 1146 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 1147 switch (mode & S_IFMT) { 1148 case S_IFDIR: 1149 inode->i_fop = &simple_dir_operations; 1150 inode->i_op = &simple_dir_inode_operations; 1151 inc_nlink(inode); 1152 break; 1153 default: 1154 break; 1155 } 1156 return inode; 1157 } 1158 1159 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl) 1160 { 1161 struct inode *inode; 1162 1163 inode = nfsd_get_inode(dir->i_sb, mode); 1164 if (!inode) 1165 return -ENOMEM; 1166 if (ncl) { 1167 inode->i_private = ncl; 1168 kref_get(&ncl->cl_ref); 1169 } 1170 d_add(dentry, inode); 1171 inc_nlink(dir); 1172 fsnotify_mkdir(dir, dentry); 1173 return 0; 1174 } 1175 1176 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name) 1177 { 1178 struct inode *dir = parent->d_inode; 1179 struct dentry *dentry; 1180 int ret = -ENOMEM; 1181 1182 inode_lock(dir); 1183 dentry = d_alloc_name(parent, name); 1184 if (!dentry) 1185 goto out_err; 1186 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl); 1187 if (ret) 1188 goto out_err; 1189 out: 1190 inode_unlock(dir); 1191 return dentry; 1192 out_err: 1193 dput(dentry); 1194 dentry = ERR_PTR(ret); 1195 goto out; 1196 } 1197 1198 static void clear_ncl(struct inode *inode) 1199 { 1200 struct nfsdfs_client *ncl = inode->i_private; 1201 1202 inode->i_private = NULL; 1203 kref_put(&ncl->cl_ref, ncl->cl_release); 1204 } 1205 1206 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode) 1207 { 1208 struct nfsdfs_client *nc = inode->i_private; 1209 1210 if (nc) 1211 kref_get(&nc->cl_ref); 1212 return nc; 1213 } 1214 1215 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode) 1216 { 1217 struct nfsdfs_client *nc; 1218 1219 inode_lock_shared(inode); 1220 nc = __get_nfsdfs_client(inode); 1221 inode_unlock_shared(inode); 1222 return nc; 1223 } 1224 /* from __rpc_unlink */ 1225 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry) 1226 { 1227 int ret; 1228 1229 clear_ncl(d_inode(dentry)); 1230 dget(dentry); 1231 ret = simple_unlink(dir, dentry); 1232 d_drop(dentry); 1233 fsnotify_unlink(dir, dentry); 1234 dput(dentry); 1235 WARN_ON_ONCE(ret); 1236 } 1237 1238 static void nfsdfs_remove_files(struct dentry *root) 1239 { 1240 struct dentry *dentry, *tmp; 1241 1242 list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) { 1243 if (!simple_positive(dentry)) { 1244 WARN_ON_ONCE(1); /* I think this can't happen? */ 1245 continue; 1246 } 1247 nfsdfs_remove_file(d_inode(root), dentry); 1248 } 1249 } 1250 1251 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share 1252 * code instead. */ 1253 static int nfsdfs_create_files(struct dentry *root, 1254 const struct tree_descr *files, 1255 struct dentry **fdentries) 1256 { 1257 struct inode *dir = d_inode(root); 1258 struct inode *inode; 1259 struct dentry *dentry; 1260 int i; 1261 1262 inode_lock(dir); 1263 for (i = 0; files->name && files->name[0]; i++, files++) { 1264 dentry = d_alloc_name(root, files->name); 1265 if (!dentry) 1266 goto out; 1267 inode = nfsd_get_inode(d_inode(root)->i_sb, 1268 S_IFREG | files->mode); 1269 if (!inode) { 1270 dput(dentry); 1271 goto out; 1272 } 1273 inode->i_fop = files->ops; 1274 inode->i_private = __get_nfsdfs_client(dir); 1275 d_add(dentry, inode); 1276 fsnotify_create(dir, dentry); 1277 if (fdentries) 1278 fdentries[i] = dentry; 1279 } 1280 inode_unlock(dir); 1281 return 0; 1282 out: 1283 nfsdfs_remove_files(root); 1284 inode_unlock(dir); 1285 return -ENOMEM; 1286 } 1287 1288 /* on success, returns positive number unique to that client. */ 1289 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn, 1290 struct nfsdfs_client *ncl, u32 id, 1291 const struct tree_descr *files, 1292 struct dentry **fdentries) 1293 { 1294 struct dentry *dentry; 1295 char name[11]; 1296 int ret; 1297 1298 sprintf(name, "%u", id); 1299 1300 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name); 1301 if (IS_ERR(dentry)) /* XXX: tossing errors? */ 1302 return NULL; 1303 ret = nfsdfs_create_files(dentry, files, fdentries); 1304 if (ret) { 1305 nfsd_client_rmdir(dentry); 1306 return NULL; 1307 } 1308 return dentry; 1309 } 1310 1311 /* Taken from __rpc_rmdir: */ 1312 void nfsd_client_rmdir(struct dentry *dentry) 1313 { 1314 struct inode *dir = d_inode(dentry->d_parent); 1315 struct inode *inode = d_inode(dentry); 1316 int ret; 1317 1318 inode_lock(dir); 1319 nfsdfs_remove_files(dentry); 1320 clear_ncl(inode); 1321 dget(dentry); 1322 ret = simple_rmdir(dir, dentry); 1323 WARN_ON_ONCE(ret); 1324 d_drop(dentry); 1325 fsnotify_rmdir(dir, dentry); 1326 dput(dentry); 1327 inode_unlock(dir); 1328 } 1329 1330 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc) 1331 { 1332 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 1333 nfsd_net_id); 1334 struct dentry *dentry; 1335 int ret; 1336 1337 static const struct tree_descr nfsd_files[] = { 1338 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO}, 1339 /* Per-export io stats use same ops as exports file */ 1340 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO}, 1341 [NFSD_Export_features] = {"export_features", 1342 &export_features_fops, S_IRUGO}, 1343 [NFSD_FO_UnlockIP] = {"unlock_ip", 1344 &transaction_ops, S_IWUSR|S_IRUSR}, 1345 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1346 &transaction_ops, S_IWUSR|S_IRUSR}, 1347 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1348 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1349 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1350 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1351 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", 1352 &nfsd_reply_cache_stats_fops, S_IRUGO}, 1353 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1354 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1355 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1356 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO}, 1357 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO}, 1358 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE) 1359 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", 1360 &supported_enctypes_fops, S_IRUGO}, 1361 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */ 1362 #ifdef CONFIG_NFSD_V4 1363 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1364 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1365 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1366 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO}, 1367 #endif 1368 /* last one */ {""} 1369 }; 1370 1371 ret = simple_fill_super(sb, 0x6e667364, nfsd_files); 1372 if (ret) 1373 return ret; 1374 dentry = nfsd_mkdir(sb->s_root, NULL, "clients"); 1375 if (IS_ERR(dentry)) 1376 return PTR_ERR(dentry); 1377 nn->nfsd_client_dir = dentry; 1378 return 0; 1379 } 1380 1381 static int nfsd_fs_get_tree(struct fs_context *fc) 1382 { 1383 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns)); 1384 } 1385 1386 static void nfsd_fs_free_fc(struct fs_context *fc) 1387 { 1388 if (fc->s_fs_info) 1389 put_net(fc->s_fs_info); 1390 } 1391 1392 static const struct fs_context_operations nfsd_fs_context_ops = { 1393 .free = nfsd_fs_free_fc, 1394 .get_tree = nfsd_fs_get_tree, 1395 }; 1396 1397 static int nfsd_init_fs_context(struct fs_context *fc) 1398 { 1399 put_user_ns(fc->user_ns); 1400 fc->user_ns = get_user_ns(fc->net_ns->user_ns); 1401 fc->ops = &nfsd_fs_context_ops; 1402 return 0; 1403 } 1404 1405 static void nfsd_umount(struct super_block *sb) 1406 { 1407 struct net *net = sb->s_fs_info; 1408 1409 nfsd_shutdown_threads(net); 1410 1411 kill_litter_super(sb); 1412 put_net(net); 1413 } 1414 1415 static struct file_system_type nfsd_fs_type = { 1416 .owner = THIS_MODULE, 1417 .name = "nfsd", 1418 .init_fs_context = nfsd_init_fs_context, 1419 .kill_sb = nfsd_umount, 1420 }; 1421 MODULE_ALIAS_FS("nfsd"); 1422 1423 #ifdef CONFIG_PROC_FS 1424 static int create_proc_exports_entry(void) 1425 { 1426 struct proc_dir_entry *entry; 1427 1428 entry = proc_mkdir("fs/nfs", NULL); 1429 if (!entry) 1430 return -ENOMEM; 1431 entry = proc_create("exports", 0, entry, &exports_proc_ops); 1432 if (!entry) { 1433 remove_proc_entry("fs/nfs", NULL); 1434 return -ENOMEM; 1435 } 1436 return 0; 1437 } 1438 #else /* CONFIG_PROC_FS */ 1439 static int create_proc_exports_entry(void) 1440 { 1441 return 0; 1442 } 1443 #endif 1444 1445 unsigned int nfsd_net_id; 1446 1447 static __net_init int nfsd_init_net(struct net *net) 1448 { 1449 int retval; 1450 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1451 1452 retval = nfsd_export_init(net); 1453 if (retval) 1454 goto out_export_error; 1455 retval = nfsd_idmap_init(net); 1456 if (retval) 1457 goto out_idmap_error; 1458 nn->nfsd_versions = NULL; 1459 nn->nfsd4_minorversions = NULL; 1460 nfsd4_init_leases_net(nn); 1461 retval = nfsd_reply_cache_init(nn); 1462 if (retval) 1463 goto out_cache_error; 1464 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key)); 1465 seqlock_init(&nn->writeverf_lock); 1466 1467 return 0; 1468 1469 out_cache_error: 1470 nfsd_idmap_shutdown(net); 1471 out_idmap_error: 1472 nfsd_export_shutdown(net); 1473 out_export_error: 1474 return retval; 1475 } 1476 1477 static __net_exit void nfsd_exit_net(struct net *net) 1478 { 1479 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1480 1481 nfsd_reply_cache_shutdown(nn); 1482 nfsd_idmap_shutdown(net); 1483 nfsd_export_shutdown(net); 1484 nfsd_netns_free_versions(net_generic(net, nfsd_net_id)); 1485 } 1486 1487 static struct pernet_operations nfsd_net_ops = { 1488 .init = nfsd_init_net, 1489 .exit = nfsd_exit_net, 1490 .id = &nfsd_net_id, 1491 .size = sizeof(struct nfsd_net), 1492 }; 1493 1494 static int __init init_nfsd(void) 1495 { 1496 int retval; 1497 1498 retval = nfsd4_init_slabs(); 1499 if (retval) 1500 return retval; 1501 retval = nfsd4_init_pnfs(); 1502 if (retval) 1503 goto out_free_slabs; 1504 retval = nfsd_stat_init(); /* Statistics */ 1505 if (retval) 1506 goto out_free_pnfs; 1507 retval = nfsd_drc_slab_create(); 1508 if (retval) 1509 goto out_free_stat; 1510 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 1511 retval = create_proc_exports_entry(); 1512 if (retval) 1513 goto out_free_lockd; 1514 retval = register_pernet_subsys(&nfsd_net_ops); 1515 if (retval < 0) 1516 goto out_free_exports; 1517 retval = register_cld_notifier(); 1518 if (retval) 1519 goto out_free_subsys; 1520 retval = nfsd4_create_laundry_wq(); 1521 if (retval) 1522 goto out_free_cld; 1523 retval = register_filesystem(&nfsd_fs_type); 1524 if (retval) 1525 goto out_free_all; 1526 return 0; 1527 out_free_all: 1528 nfsd4_destroy_laundry_wq(); 1529 out_free_cld: 1530 unregister_cld_notifier(); 1531 out_free_subsys: 1532 unregister_pernet_subsys(&nfsd_net_ops); 1533 out_free_exports: 1534 remove_proc_entry("fs/nfs/exports", NULL); 1535 remove_proc_entry("fs/nfs", NULL); 1536 out_free_lockd: 1537 nfsd_lockd_shutdown(); 1538 nfsd_drc_slab_free(); 1539 out_free_stat: 1540 nfsd_stat_shutdown(); 1541 out_free_pnfs: 1542 nfsd4_exit_pnfs(); 1543 out_free_slabs: 1544 nfsd4_free_slabs(); 1545 return retval; 1546 } 1547 1548 static void __exit exit_nfsd(void) 1549 { 1550 unregister_filesystem(&nfsd_fs_type); 1551 nfsd4_destroy_laundry_wq(); 1552 unregister_cld_notifier(); 1553 unregister_pernet_subsys(&nfsd_net_ops); 1554 nfsd_drc_slab_free(); 1555 remove_proc_entry("fs/nfs/exports", NULL); 1556 remove_proc_entry("fs/nfs", NULL); 1557 nfsd_stat_shutdown(); 1558 nfsd_lockd_shutdown(); 1559 nfsd4_free_slabs(); 1560 nfsd4_exit_pnfs(); 1561 } 1562 1563 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1564 MODULE_LICENSE("GPL"); 1565 module_init(init_nfsd) 1566 module_exit(exit_nfsd) 1567