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 29 /* 30 * We have a single directory with several nodes in it. 31 */ 32 enum { 33 NFSD_Root = 1, 34 NFSD_List, 35 NFSD_Export_Stats, 36 NFSD_Export_features, 37 NFSD_Fh, 38 NFSD_FO_UnlockIP, 39 NFSD_FO_UnlockFS, 40 NFSD_Threads, 41 NFSD_Pool_Threads, 42 NFSD_Pool_Stats, 43 NFSD_Reply_Cache_Stats, 44 NFSD_Versions, 45 NFSD_Ports, 46 NFSD_MaxBlkSize, 47 NFSD_MaxConnections, 48 NFSD_SupportedEnctypes, 49 /* 50 * The below MUST come last. Otherwise we leave a hole in nfsd_files[] 51 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops 52 */ 53 #ifdef CONFIG_NFSD_V4 54 NFSD_Leasetime, 55 NFSD_Gracetime, 56 NFSD_RecoveryDir, 57 NFSD_V4EndGrace, 58 #endif 59 NFSD_MaxReserved 60 }; 61 62 /* 63 * write() for these nodes. 64 */ 65 static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 66 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); 67 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); 68 static ssize_t write_threads(struct file *file, char *buf, size_t size); 69 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 70 static ssize_t write_versions(struct file *file, char *buf, size_t size); 71 static ssize_t write_ports(struct file *file, char *buf, size_t size); 72 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 73 static ssize_t write_maxconn(struct file *file, char *buf, size_t size); 74 #ifdef CONFIG_NFSD_V4 75 static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 76 static ssize_t write_gracetime(struct file *file, char *buf, size_t size); 77 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 78 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size); 79 #endif 80 81 static ssize_t (*const write_op[])(struct file *, char *, size_t) = { 82 [NFSD_Fh] = write_filehandle, 83 [NFSD_FO_UnlockIP] = write_unlock_ip, 84 [NFSD_FO_UnlockFS] = write_unlock_fs, 85 [NFSD_Threads] = write_threads, 86 [NFSD_Pool_Threads] = write_pool_threads, 87 [NFSD_Versions] = write_versions, 88 [NFSD_Ports] = write_ports, 89 [NFSD_MaxBlkSize] = write_maxblksize, 90 [NFSD_MaxConnections] = write_maxconn, 91 #ifdef CONFIG_NFSD_V4 92 [NFSD_Leasetime] = write_leasetime, 93 [NFSD_Gracetime] = write_gracetime, 94 [NFSD_RecoveryDir] = write_recoverydir, 95 [NFSD_V4EndGrace] = write_v4_end_grace, 96 #endif 97 }; 98 99 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 100 { 101 ino_t ino = file_inode(file)->i_ino; 102 char *data; 103 ssize_t rv; 104 105 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 106 return -EINVAL; 107 108 data = simple_transaction_get(file, buf, size); 109 if (IS_ERR(data)) 110 return PTR_ERR(data); 111 112 rv = write_op[ino](file, data, size); 113 if (rv >= 0) { 114 simple_transaction_set(file, rv); 115 rv = size; 116 } 117 return rv; 118 } 119 120 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) 121 { 122 if (! file->private_data) { 123 /* An attempt to read a transaction file without writing 124 * causes a 0-byte write so that the file can return 125 * state information 126 */ 127 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); 128 if (rv < 0) 129 return rv; 130 } 131 return simple_transaction_read(file, buf, size, pos); 132 } 133 134 static const struct file_operations transaction_ops = { 135 .write = nfsctl_transaction_write, 136 .read = nfsctl_transaction_read, 137 .release = simple_transaction_release, 138 .llseek = default_llseek, 139 }; 140 141 static int exports_net_open(struct net *net, struct file *file) 142 { 143 int err; 144 struct seq_file *seq; 145 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 146 147 err = seq_open(file, &nfs_exports_op); 148 if (err) 149 return err; 150 151 seq = file->private_data; 152 seq->private = nn->svc_export_cache; 153 return 0; 154 } 155 156 static int exports_proc_open(struct inode *inode, struct file *file) 157 { 158 return exports_net_open(current->nsproxy->net_ns, file); 159 } 160 161 static const struct proc_ops exports_proc_ops = { 162 .proc_open = exports_proc_open, 163 .proc_read = seq_read, 164 .proc_lseek = seq_lseek, 165 .proc_release = seq_release, 166 }; 167 168 static int exports_nfsd_open(struct inode *inode, struct file *file) 169 { 170 return exports_net_open(inode->i_sb->s_fs_info, file); 171 } 172 173 static const struct file_operations exports_nfsd_operations = { 174 .open = exports_nfsd_open, 175 .read = seq_read, 176 .llseek = seq_lseek, 177 .release = seq_release, 178 }; 179 180 static int export_features_show(struct seq_file *m, void *v) 181 { 182 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS); 183 return 0; 184 } 185 186 static int export_features_open(struct inode *inode, struct file *file) 187 { 188 return single_open(file, export_features_show, NULL); 189 } 190 191 static const struct file_operations export_features_operations = { 192 .open = export_features_open, 193 .read = seq_read, 194 .llseek = seq_lseek, 195 .release = single_release, 196 }; 197 198 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE) 199 static int supported_enctypes_show(struct seq_file *m, void *v) 200 { 201 seq_printf(m, KRB5_SUPPORTED_ENCTYPES); 202 return 0; 203 } 204 205 static int supported_enctypes_open(struct inode *inode, struct file *file) 206 { 207 return single_open(file, supported_enctypes_show, NULL); 208 } 209 210 static const struct file_operations supported_enctypes_ops = { 211 .open = supported_enctypes_open, 212 .read = seq_read, 213 .llseek = seq_lseek, 214 .release = single_release, 215 }; 216 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */ 217 218 static const struct file_operations pool_stats_operations = { 219 .open = nfsd_pool_stats_open, 220 .read = seq_read, 221 .llseek = seq_lseek, 222 .release = nfsd_pool_stats_release, 223 }; 224 225 static const struct file_operations reply_cache_stats_operations = { 226 .open = nfsd_reply_cache_stats_open, 227 .read = seq_read, 228 .llseek = seq_lseek, 229 .release = single_release, 230 }; 231 232 /*----------------------------------------------------------------------------*/ 233 /* 234 * payload - write methods 235 */ 236 237 static inline struct net *netns(struct file *file) 238 { 239 return file_inode(file)->i_sb->s_fs_info; 240 } 241 242 /* 243 * write_unlock_ip - Release all locks used by a client 244 * 245 * Experimental. 246 * 247 * Input: 248 * buf: '\n'-terminated C string containing a 249 * presentation format IP address 250 * size: length of C string in @buf 251 * Output: 252 * On success: returns zero if all specified locks were released; 253 * returns one if one or more locks were not released 254 * On error: return code is negative errno value 255 */ 256 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) 257 { 258 struct sockaddr_storage address; 259 struct sockaddr *sap = (struct sockaddr *)&address; 260 size_t salen = sizeof(address); 261 char *fo_path; 262 struct net *net = netns(file); 263 264 /* sanity check */ 265 if (size == 0) 266 return -EINVAL; 267 268 if (buf[size-1] != '\n') 269 return -EINVAL; 270 271 fo_path = buf; 272 if (qword_get(&buf, fo_path, size) < 0) 273 return -EINVAL; 274 275 if (rpc_pton(net, fo_path, size, sap, salen) == 0) 276 return -EINVAL; 277 278 return nlmsvc_unlock_all_by_ip(sap); 279 } 280 281 /* 282 * write_unlock_fs - Release all locks on a local file system 283 * 284 * Experimental. 285 * 286 * Input: 287 * buf: '\n'-terminated C string containing the 288 * absolute pathname of a local file system 289 * size: length of C string in @buf 290 * Output: 291 * On success: returns zero if all specified locks were released; 292 * returns one if one or more locks were not released 293 * On error: return code is negative errno value 294 */ 295 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size) 296 { 297 struct path path; 298 char *fo_path; 299 int error; 300 301 /* sanity check */ 302 if (size == 0) 303 return -EINVAL; 304 305 if (buf[size-1] != '\n') 306 return -EINVAL; 307 308 fo_path = buf; 309 if (qword_get(&buf, fo_path, size) < 0) 310 return -EINVAL; 311 312 error = kern_path(fo_path, 0, &path); 313 if (error) 314 return error; 315 316 /* 317 * XXX: Needs better sanity checking. Otherwise we could end up 318 * releasing locks on the wrong file system. 319 * 320 * For example: 321 * 1. Does the path refer to a directory? 322 * 2. Is that directory a mount point, or 323 * 3. Is that directory the root of an exported file system? 324 */ 325 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb); 326 327 path_put(&path); 328 return error; 329 } 330 331 /* 332 * write_filehandle - Get a variable-length NFS file handle by path 333 * 334 * On input, the buffer contains a '\n'-terminated C string comprised of 335 * three alphanumeric words separated by whitespace. The string may 336 * contain escape sequences. 337 * 338 * Input: 339 * buf: 340 * domain: client domain name 341 * path: export pathname 342 * maxsize: numeric maximum size of 343 * @buf 344 * size: length of C string in @buf 345 * Output: 346 * On success: passed-in buffer filled with '\n'-terminated C 347 * string containing a ASCII hex text version 348 * of the NFS file handle; 349 * return code is the size in bytes of the string 350 * On error: return code is negative errno value 351 */ 352 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 353 { 354 char *dname, *path; 355 int maxsize; 356 char *mesg = buf; 357 int len; 358 struct auth_domain *dom; 359 struct knfsd_fh fh; 360 361 if (size == 0) 362 return -EINVAL; 363 364 if (buf[size-1] != '\n') 365 return -EINVAL; 366 buf[size-1] = 0; 367 368 dname = mesg; 369 len = qword_get(&mesg, dname, size); 370 if (len <= 0) 371 return -EINVAL; 372 373 path = dname+len+1; 374 len = qword_get(&mesg, path, size); 375 if (len <= 0) 376 return -EINVAL; 377 378 len = get_int(&mesg, &maxsize); 379 if (len) 380 return len; 381 382 if (maxsize < NFS_FHSIZE) 383 return -EINVAL; 384 maxsize = min(maxsize, NFS3_FHSIZE); 385 386 if (qword_get(&mesg, mesg, size)>0) 387 return -EINVAL; 388 389 /* we have all the words, they are in buf.. */ 390 dom = unix_domain_find(dname); 391 if (!dom) 392 return -ENOMEM; 393 394 len = exp_rootfh(netns(file), dom, path, &fh, maxsize); 395 auth_domain_put(dom); 396 if (len) 397 return len; 398 399 mesg = buf; 400 len = SIMPLE_TRANSACTION_LIMIT; 401 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); 402 mesg[-1] = '\n'; 403 return mesg - buf; 404 } 405 406 /* 407 * write_threads - Start NFSD, or report the current number of running threads 408 * 409 * Input: 410 * buf: ignored 411 * size: zero 412 * Output: 413 * On success: passed-in buffer filled with '\n'-terminated C 414 * string numeric value representing the number of 415 * running NFSD threads; 416 * return code is the size in bytes of the string 417 * On error: return code is zero 418 * 419 * OR 420 * 421 * Input: 422 * buf: C string containing an unsigned 423 * integer value representing the 424 * number of NFSD threads to start 425 * size: non-zero length of C string in @buf 426 * Output: 427 * On success: NFS service is started; 428 * passed-in buffer filled with '\n'-terminated C 429 * string numeric value representing the number of 430 * running NFSD threads; 431 * return code is the size in bytes of the string 432 * On error: return code is zero or a negative errno value 433 */ 434 static ssize_t write_threads(struct file *file, char *buf, size_t size) 435 { 436 char *mesg = buf; 437 int rv; 438 struct net *net = netns(file); 439 440 if (size > 0) { 441 int newthreads; 442 rv = get_int(&mesg, &newthreads); 443 if (rv) 444 return rv; 445 if (newthreads < 0) 446 return -EINVAL; 447 rv = nfsd_svc(newthreads, net, file->f_cred); 448 if (rv < 0) 449 return rv; 450 } else 451 rv = nfsd_nrthreads(net); 452 453 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); 454 } 455 456 /* 457 * write_pool_threads - Set or report the current number of threads per pool 458 * 459 * Input: 460 * buf: ignored 461 * size: zero 462 * 463 * OR 464 * 465 * Input: 466 * buf: C string containing whitespace- 467 * separated unsigned integer values 468 * representing the number of NFSD 469 * threads to start in each pool 470 * size: non-zero length of C string in @buf 471 * Output: 472 * On success: passed-in buffer filled with '\n'-terminated C 473 * string containing integer values representing the 474 * number of NFSD threads in each pool; 475 * return code is the size in bytes of the string 476 * On error: return code is zero or a negative errno value 477 */ 478 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 479 { 480 /* if size > 0, look for an array of number of threads per node 481 * and apply them then write out number of threads per node as reply 482 */ 483 char *mesg = buf; 484 int i; 485 int rv; 486 int len; 487 int npools; 488 int *nthreads; 489 struct net *net = netns(file); 490 491 mutex_lock(&nfsd_mutex); 492 npools = nfsd_nrpools(net); 493 if (npools == 0) { 494 /* 495 * NFS is shut down. The admin can start it by 496 * writing to the threads file but NOT the pool_threads 497 * file, sorry. Report zero threads. 498 */ 499 mutex_unlock(&nfsd_mutex); 500 strcpy(buf, "0\n"); 501 return strlen(buf); 502 } 503 504 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); 505 rv = -ENOMEM; 506 if (nthreads == NULL) 507 goto out_free; 508 509 if (size > 0) { 510 for (i = 0; i < npools; i++) { 511 rv = get_int(&mesg, &nthreads[i]); 512 if (rv == -ENOENT) 513 break; /* fewer numbers than pools */ 514 if (rv) 515 goto out_free; /* syntax error */ 516 rv = -EINVAL; 517 if (nthreads[i] < 0) 518 goto out_free; 519 } 520 rv = nfsd_set_nrthreads(i, nthreads, net); 521 if (rv) 522 goto out_free; 523 } 524 525 rv = nfsd_get_nrthreads(npools, nthreads, net); 526 if (rv) 527 goto out_free; 528 529 mesg = buf; 530 size = SIMPLE_TRANSACTION_LIMIT; 531 for (i = 0; i < npools && size > 0; i++) { 532 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 533 len = strlen(mesg); 534 size -= len; 535 mesg += len; 536 } 537 rv = mesg - buf; 538 out_free: 539 kfree(nthreads); 540 mutex_unlock(&nfsd_mutex); 541 return rv; 542 } 543 544 static ssize_t 545 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining, 546 const char *sep, unsigned vers, int minor) 547 { 548 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u"; 549 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST); 550 551 if (vers == 4 && minor >= 0 && 552 !nfsd_minorversion(nn, minor, NFSD_TEST)) 553 supported = false; 554 if (minor == 0 && supported) 555 /* 556 * special case for backward compatability. 557 * +4.0 is never reported, it is implied by 558 * +4, unless -4.0 is present. 559 */ 560 return 0; 561 return snprintf(buf, remaining, format, sep, 562 supported ? '+' : '-', vers, minor); 563 } 564 565 static ssize_t __write_versions(struct file *file, char *buf, size_t size) 566 { 567 char *mesg = buf; 568 char *vers, *minorp, sign; 569 int len, num, remaining; 570 ssize_t tlen = 0; 571 char *sep; 572 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 573 574 if (size>0) { 575 if (nn->nfsd_serv) 576 /* Cannot change versions without updating 577 * nn->nfsd_serv->sv_xdrsize, and reallocing 578 * rq_argp and rq_resp 579 */ 580 return -EBUSY; 581 if (buf[size-1] != '\n') 582 return -EINVAL; 583 buf[size-1] = 0; 584 585 vers = mesg; 586 len = qword_get(&mesg, vers, size); 587 if (len <= 0) return -EINVAL; 588 do { 589 enum vers_op cmd; 590 unsigned minor; 591 sign = *vers; 592 if (sign == '+' || sign == '-') 593 num = simple_strtol((vers+1), &minorp, 0); 594 else 595 num = simple_strtol(vers, &minorp, 0); 596 if (*minorp == '.') { 597 if (num != 4) 598 return -EINVAL; 599 if (kstrtouint(minorp+1, 0, &minor) < 0) 600 return -EINVAL; 601 } 602 603 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET; 604 switch(num) { 605 case 2: 606 case 3: 607 nfsd_vers(nn, num, cmd); 608 break; 609 case 4: 610 if (*minorp == '.') { 611 if (nfsd_minorversion(nn, minor, cmd) < 0) 612 return -EINVAL; 613 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) { 614 /* 615 * Either we have +4 and no minors are enabled, 616 * or we have -4 and at least one minor is enabled. 617 * In either case, propagate 'cmd' to all minors. 618 */ 619 minor = 0; 620 while (nfsd_minorversion(nn, minor, cmd) >= 0) 621 minor++; 622 } 623 break; 624 default: 625 return -EINVAL; 626 } 627 vers += len + 1; 628 } while ((len = qword_get(&mesg, vers, size)) > 0); 629 /* If all get turned off, turn them back on, as 630 * having no versions is BAD 631 */ 632 nfsd_reset_versions(nn); 633 } 634 635 /* Now write current state into reply buffer */ 636 len = 0; 637 sep = ""; 638 remaining = SIMPLE_TRANSACTION_LIMIT; 639 for (num=2 ; num <= 4 ; num++) { 640 int minor; 641 if (!nfsd_vers(nn, num, NFSD_AVAIL)) 642 continue; 643 644 minor = -1; 645 do { 646 len = nfsd_print_version_support(nn, buf, remaining, 647 sep, num, minor); 648 if (len >= remaining) 649 goto out; 650 remaining -= len; 651 buf += len; 652 tlen += len; 653 minor++; 654 if (len) 655 sep = " "; 656 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION); 657 } 658 out: 659 len = snprintf(buf, remaining, "\n"); 660 if (len >= remaining) 661 return -EINVAL; 662 return tlen + len; 663 } 664 665 /* 666 * write_versions - Set or report the available NFS protocol versions 667 * 668 * Input: 669 * buf: ignored 670 * size: zero 671 * Output: 672 * On success: passed-in buffer filled with '\n'-terminated C 673 * string containing positive or negative integer 674 * values representing the current status of each 675 * 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 * OR 680 * 681 * Input: 682 * buf: C string containing whitespace- 683 * separated positive or negative 684 * integer values representing NFS 685 * protocol versions to enable ("+n") 686 * or disable ("-n") 687 * size: non-zero length of C string in @buf 688 * Output: 689 * On success: status of zero or more protocol versions has 690 * been updated; passed-in buffer filled with 691 * '\n'-terminated C string containing positive 692 * or negative integer values representing the 693 * current status of each protocol version; 694 * return code is the size in bytes of the string 695 * On error: return code is zero or a negative errno value 696 */ 697 static ssize_t write_versions(struct file *file, char *buf, size_t size) 698 { 699 ssize_t rv; 700 701 mutex_lock(&nfsd_mutex); 702 rv = __write_versions(file, buf, size); 703 mutex_unlock(&nfsd_mutex); 704 return rv; 705 } 706 707 /* 708 * Zero-length write. Return a list of NFSD's current listener 709 * transports. 710 */ 711 static ssize_t __write_ports_names(char *buf, struct net *net) 712 { 713 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 714 715 if (nn->nfsd_serv == NULL) 716 return 0; 717 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); 718 } 719 720 /* 721 * A single 'fd' number was written, in which case it must be for 722 * a socket of a supported family/protocol, and we use it as an 723 * nfsd listener. 724 */ 725 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred) 726 { 727 char *mesg = buf; 728 int fd, err; 729 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 730 731 err = get_int(&mesg, &fd); 732 if (err != 0 || fd < 0) 733 return -EINVAL; 734 735 if (svc_alien_sock(net, fd)) { 736 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__); 737 return -EINVAL; 738 } 739 740 err = nfsd_create_serv(net); 741 if (err != 0) 742 return err; 743 744 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred); 745 if (err < 0) { 746 nfsd_destroy(net); 747 return err; 748 } 749 750 /* Decrease the count, but don't shut down the service */ 751 nn->nfsd_serv->sv_nrthreads--; 752 return err; 753 } 754 755 /* 756 * A transport listener is added by writing it's transport name and 757 * a port number. 758 */ 759 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred) 760 { 761 char transport[16]; 762 struct svc_xprt *xprt; 763 int port, err; 764 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 765 766 if (sscanf(buf, "%15s %5u", transport, &port) != 2) 767 return -EINVAL; 768 769 if (port < 1 || port > USHRT_MAX) 770 return -EINVAL; 771 772 err = nfsd_create_serv(net); 773 if (err != 0) 774 return err; 775 776 err = svc_create_xprt(nn->nfsd_serv, transport, net, 777 PF_INET, port, SVC_SOCK_ANONYMOUS, cred); 778 if (err < 0) 779 goto out_err; 780 781 err = svc_create_xprt(nn->nfsd_serv, transport, net, 782 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred); 783 if (err < 0 && err != -EAFNOSUPPORT) 784 goto out_close; 785 786 /* Decrease the count, but don't shut down the service */ 787 nn->nfsd_serv->sv_nrthreads--; 788 return 0; 789 out_close: 790 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port); 791 if (xprt != NULL) { 792 svc_close_xprt(xprt); 793 svc_xprt_put(xprt); 794 } 795 out_err: 796 nfsd_destroy(net); 797 return err; 798 } 799 800 static ssize_t __write_ports(struct file *file, char *buf, size_t size, 801 struct net *net) 802 { 803 if (size == 0) 804 return __write_ports_names(buf, net); 805 806 if (isdigit(buf[0])) 807 return __write_ports_addfd(buf, net, file->f_cred); 808 809 if (isalpha(buf[0])) 810 return __write_ports_addxprt(buf, net, file->f_cred); 811 812 return -EINVAL; 813 } 814 815 /* 816 * write_ports - Pass a socket file descriptor or transport name to listen on 817 * 818 * Input: 819 * buf: ignored 820 * size: zero 821 * Output: 822 * On success: passed-in buffer filled with a '\n'-terminated C 823 * string containing a whitespace-separated list of 824 * named NFSD listeners; 825 * return code is the size in bytes of the string 826 * On error: return code is zero or a negative errno value 827 * 828 * OR 829 * 830 * Input: 831 * buf: C string containing an unsigned 832 * integer value representing a bound 833 * but unconnected socket that is to be 834 * used as an NFSD listener; listen(3) 835 * must be called for a SOCK_STREAM 836 * socket, otherwise it is ignored 837 * size: non-zero length of C string in @buf 838 * Output: 839 * On success: NFS service is started; 840 * passed-in buffer filled with a '\n'-terminated C 841 * string containing a unique alphanumeric name of 842 * the listener; 843 * return code is the size in bytes of the string 844 * On error: return code is a negative errno value 845 * 846 * OR 847 * 848 * Input: 849 * buf: C string containing a transport 850 * name and an unsigned integer value 851 * representing the port to listen on, 852 * separated by whitespace 853 * size: non-zero length of C string in @buf 854 * Output: 855 * On success: returns zero; NFS service is started 856 * On error: return code is a negative errno value 857 */ 858 static ssize_t write_ports(struct file *file, char *buf, size_t size) 859 { 860 ssize_t rv; 861 862 mutex_lock(&nfsd_mutex); 863 rv = __write_ports(file, buf, size, netns(file)); 864 mutex_unlock(&nfsd_mutex); 865 return rv; 866 } 867 868 869 int nfsd_max_blksize; 870 871 /* 872 * write_maxblksize - Set or report the current NFS blksize 873 * 874 * Input: 875 * buf: ignored 876 * size: zero 877 * 878 * OR 879 * 880 * Input: 881 * buf: C string containing an unsigned 882 * integer value representing the new 883 * NFS blksize 884 * size: non-zero length of C string in @buf 885 * Output: 886 * On success: passed-in buffer filled with '\n'-terminated C string 887 * containing numeric value of the current NFS blksize 888 * setting; 889 * return code is the size in bytes of the string 890 * On error: return code is zero or a negative errno value 891 */ 892 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 893 { 894 char *mesg = buf; 895 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 896 897 if (size > 0) { 898 int bsize; 899 int rv = get_int(&mesg, &bsize); 900 if (rv) 901 return rv; 902 /* force bsize into allowed range and 903 * required alignment. 904 */ 905 bsize = max_t(int, bsize, 1024); 906 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE); 907 bsize &= ~(1024-1); 908 mutex_lock(&nfsd_mutex); 909 if (nn->nfsd_serv) { 910 mutex_unlock(&nfsd_mutex); 911 return -EBUSY; 912 } 913 nfsd_max_blksize = bsize; 914 mutex_unlock(&nfsd_mutex); 915 } 916 917 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 918 nfsd_max_blksize); 919 } 920 921 /* 922 * write_maxconn - Set or report the current max number of connections 923 * 924 * Input: 925 * buf: ignored 926 * size: zero 927 * OR 928 * 929 * Input: 930 * buf: C string containing an unsigned 931 * integer value representing the new 932 * number of max connections 933 * size: non-zero length of C string in @buf 934 * Output: 935 * On success: passed-in buffer filled with '\n'-terminated C string 936 * containing numeric value of max_connections setting 937 * for this net namespace; 938 * return code is the size in bytes of the string 939 * On error: return code is zero or a negative errno value 940 */ 941 static ssize_t write_maxconn(struct file *file, char *buf, size_t size) 942 { 943 char *mesg = buf; 944 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 945 unsigned int maxconn = nn->max_connections; 946 947 if (size > 0) { 948 int rv = get_uint(&mesg, &maxconn); 949 950 if (rv) 951 return rv; 952 nn->max_connections = maxconn; 953 } 954 955 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn); 956 } 957 958 #ifdef CONFIG_NFSD_V4 959 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, 960 time64_t *time, struct nfsd_net *nn) 961 { 962 char *mesg = buf; 963 int rv, i; 964 965 if (size > 0) { 966 if (nn->nfsd_serv) 967 return -EBUSY; 968 rv = get_int(&mesg, &i); 969 if (rv) 970 return rv; 971 /* 972 * Some sanity checking. We don't have a reason for 973 * these particular numbers, but problems with the 974 * extremes are: 975 * - Too short: the briefest network outage may 976 * cause clients to lose all their locks. Also, 977 * the frequent polling may be wasteful. 978 * - Too long: do you really want reboot recovery 979 * to take more than an hour? Or to make other 980 * clients wait an hour before being able to 981 * revoke a dead client's locks? 982 */ 983 if (i < 10 || i > 3600) 984 return -EINVAL; 985 *time = i; 986 } 987 988 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time); 989 } 990 991 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, 992 time64_t *time, struct nfsd_net *nn) 993 { 994 ssize_t rv; 995 996 mutex_lock(&nfsd_mutex); 997 rv = __nfsd4_write_time(file, buf, size, time, nn); 998 mutex_unlock(&nfsd_mutex); 999 return rv; 1000 } 1001 1002 /* 1003 * write_leasetime - Set or report the current NFSv4 lease time 1004 * 1005 * Input: 1006 * buf: ignored 1007 * size: zero 1008 * 1009 * OR 1010 * 1011 * Input: 1012 * buf: C string containing an unsigned 1013 * integer value representing the new 1014 * NFSv4 lease expiry time 1015 * size: non-zero length of C string in @buf 1016 * Output: 1017 * On success: passed-in buffer filled with '\n'-terminated C 1018 * string containing unsigned integer value of the 1019 * current lease expiry time; 1020 * return code is the size in bytes of the string 1021 * On error: return code is zero or a negative errno value 1022 */ 1023 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 1024 { 1025 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1026 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn); 1027 } 1028 1029 /* 1030 * write_gracetime - Set or report current NFSv4 grace period time 1031 * 1032 * As above, but sets the time of the NFSv4 grace period. 1033 * 1034 * Note this should never be set to less than the *previous* 1035 * lease-period time, but we don't try to enforce this. (In the common 1036 * case (a new boot), we don't know what the previous lease time was 1037 * anyway.) 1038 */ 1039 static ssize_t write_gracetime(struct file *file, char *buf, size_t size) 1040 { 1041 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1042 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn); 1043 } 1044 1045 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size, 1046 struct nfsd_net *nn) 1047 { 1048 char *mesg = buf; 1049 char *recdir; 1050 int len, status; 1051 1052 if (size > 0) { 1053 if (nn->nfsd_serv) 1054 return -EBUSY; 1055 if (size > PATH_MAX || buf[size-1] != '\n') 1056 return -EINVAL; 1057 buf[size-1] = 0; 1058 1059 recdir = mesg; 1060 len = qword_get(&mesg, recdir, size); 1061 if (len <= 0) 1062 return -EINVAL; 1063 1064 status = nfs4_reset_recoverydir(recdir); 1065 if (status) 1066 return status; 1067 } 1068 1069 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 1070 nfs4_recoverydir()); 1071 } 1072 1073 /* 1074 * write_recoverydir - Set or report the pathname of the recovery directory 1075 * 1076 * Input: 1077 * buf: ignored 1078 * size: zero 1079 * 1080 * OR 1081 * 1082 * Input: 1083 * buf: C string containing the pathname 1084 * of the directory on a local file 1085 * system containing permanent NFSv4 1086 * recovery data 1087 * size: non-zero length of C string in @buf 1088 * Output: 1089 * On success: passed-in buffer filled with '\n'-terminated C string 1090 * containing the current recovery pathname setting; 1091 * return code is the size in bytes of the string 1092 * On error: return code is zero or a negative errno value 1093 */ 1094 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1095 { 1096 ssize_t rv; 1097 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1098 1099 mutex_lock(&nfsd_mutex); 1100 rv = __write_recoverydir(file, buf, size, nn); 1101 mutex_unlock(&nfsd_mutex); 1102 return rv; 1103 } 1104 1105 /* 1106 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager 1107 * 1108 * Input: 1109 * buf: ignored 1110 * size: zero 1111 * OR 1112 * 1113 * Input: 1114 * buf: any value 1115 * size: non-zero length of C string in @buf 1116 * Output: 1117 * passed-in buffer filled with "Y" or "N" with a newline 1118 * and NULL-terminated C string. This indicates whether 1119 * the grace period has ended in the current net 1120 * namespace. Return code is the size in bytes of the 1121 * string. Writing a string that starts with 'Y', 'y', or 1122 * '1' to the file will end the grace period for nfsd's v4 1123 * lock manager. 1124 */ 1125 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size) 1126 { 1127 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1128 1129 if (size > 0) { 1130 switch(buf[0]) { 1131 case 'Y': 1132 case 'y': 1133 case '1': 1134 if (!nn->nfsd_serv) 1135 return -EBUSY; 1136 nfsd4_end_grace(nn); 1137 break; 1138 default: 1139 return -EINVAL; 1140 } 1141 } 1142 1143 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n", 1144 nn->grace_ended ? 'Y' : 'N'); 1145 } 1146 1147 #endif 1148 1149 /*----------------------------------------------------------------------------*/ 1150 /* 1151 * populating the filesystem. 1152 */ 1153 1154 /* Basically copying rpc_get_inode. */ 1155 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode) 1156 { 1157 struct inode *inode = new_inode(sb); 1158 if (!inode) 1159 return NULL; 1160 /* Following advice from simple_fill_super documentation: */ 1161 inode->i_ino = iunique(sb, NFSD_MaxReserved); 1162 inode->i_mode = mode; 1163 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 1164 switch (mode & S_IFMT) { 1165 case S_IFDIR: 1166 inode->i_fop = &simple_dir_operations; 1167 inode->i_op = &simple_dir_inode_operations; 1168 inc_nlink(inode); 1169 default: 1170 break; 1171 } 1172 return inode; 1173 } 1174 1175 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl) 1176 { 1177 struct inode *inode; 1178 1179 inode = nfsd_get_inode(dir->i_sb, mode); 1180 if (!inode) 1181 return -ENOMEM; 1182 if (ncl) { 1183 inode->i_private = ncl; 1184 kref_get(&ncl->cl_ref); 1185 } 1186 d_add(dentry, inode); 1187 inc_nlink(dir); 1188 fsnotify_mkdir(dir, dentry); 1189 return 0; 1190 } 1191 1192 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name) 1193 { 1194 struct inode *dir = parent->d_inode; 1195 struct dentry *dentry; 1196 int ret = -ENOMEM; 1197 1198 inode_lock(dir); 1199 dentry = d_alloc_name(parent, name); 1200 if (!dentry) 1201 goto out_err; 1202 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl); 1203 if (ret) 1204 goto out_err; 1205 out: 1206 inode_unlock(dir); 1207 return dentry; 1208 out_err: 1209 dput(dentry); 1210 dentry = ERR_PTR(ret); 1211 goto out; 1212 } 1213 1214 static void clear_ncl(struct inode *inode) 1215 { 1216 struct nfsdfs_client *ncl = inode->i_private; 1217 1218 inode->i_private = NULL; 1219 kref_put(&ncl->cl_ref, ncl->cl_release); 1220 } 1221 1222 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode) 1223 { 1224 struct nfsdfs_client *nc = inode->i_private; 1225 1226 if (nc) 1227 kref_get(&nc->cl_ref); 1228 return nc; 1229 } 1230 1231 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode) 1232 { 1233 struct nfsdfs_client *nc; 1234 1235 inode_lock_shared(inode); 1236 nc = __get_nfsdfs_client(inode); 1237 inode_unlock_shared(inode); 1238 return nc; 1239 } 1240 /* from __rpc_unlink */ 1241 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry) 1242 { 1243 int ret; 1244 1245 clear_ncl(d_inode(dentry)); 1246 dget(dentry); 1247 ret = simple_unlink(dir, dentry); 1248 d_delete(dentry); 1249 dput(dentry); 1250 WARN_ON_ONCE(ret); 1251 } 1252 1253 static void nfsdfs_remove_files(struct dentry *root) 1254 { 1255 struct dentry *dentry, *tmp; 1256 1257 list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) { 1258 if (!simple_positive(dentry)) { 1259 WARN_ON_ONCE(1); /* I think this can't happen? */ 1260 continue; 1261 } 1262 nfsdfs_remove_file(d_inode(root), dentry); 1263 } 1264 } 1265 1266 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share 1267 * code instead. */ 1268 static int nfsdfs_create_files(struct dentry *root, 1269 const struct tree_descr *files) 1270 { 1271 struct inode *dir = d_inode(root); 1272 struct inode *inode; 1273 struct dentry *dentry; 1274 int i; 1275 1276 inode_lock(dir); 1277 for (i = 0; files->name && files->name[0]; i++, files++) { 1278 if (!files->name) 1279 continue; 1280 dentry = d_alloc_name(root, files->name); 1281 if (!dentry) 1282 goto out; 1283 inode = nfsd_get_inode(d_inode(root)->i_sb, 1284 S_IFREG | files->mode); 1285 if (!inode) { 1286 dput(dentry); 1287 goto out; 1288 } 1289 inode->i_fop = files->ops; 1290 inode->i_private = __get_nfsdfs_client(dir); 1291 d_add(dentry, inode); 1292 fsnotify_create(dir, dentry); 1293 } 1294 inode_unlock(dir); 1295 return 0; 1296 out: 1297 nfsdfs_remove_files(root); 1298 inode_unlock(dir); 1299 return -ENOMEM; 1300 } 1301 1302 /* on success, returns positive number unique to that client. */ 1303 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn, 1304 struct nfsdfs_client *ncl, u32 id, 1305 const struct tree_descr *files) 1306 { 1307 struct dentry *dentry; 1308 char name[11]; 1309 int ret; 1310 1311 sprintf(name, "%u", id); 1312 1313 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name); 1314 if (IS_ERR(dentry)) /* XXX: tossing errors? */ 1315 return NULL; 1316 ret = nfsdfs_create_files(dentry, files); 1317 if (ret) { 1318 nfsd_client_rmdir(dentry); 1319 return NULL; 1320 } 1321 return dentry; 1322 } 1323 1324 /* Taken from __rpc_rmdir: */ 1325 void nfsd_client_rmdir(struct dentry *dentry) 1326 { 1327 struct inode *dir = d_inode(dentry->d_parent); 1328 struct inode *inode = d_inode(dentry); 1329 int ret; 1330 1331 inode_lock(dir); 1332 nfsdfs_remove_files(dentry); 1333 clear_ncl(inode); 1334 dget(dentry); 1335 ret = simple_rmdir(dir, dentry); 1336 WARN_ON_ONCE(ret); 1337 fsnotify_rmdir(dir, dentry); 1338 d_delete(dentry); 1339 dput(dentry); 1340 inode_unlock(dir); 1341 } 1342 1343 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc) 1344 { 1345 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 1346 nfsd_net_id); 1347 struct dentry *dentry; 1348 int ret; 1349 1350 static const struct tree_descr nfsd_files[] = { 1351 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO}, 1352 /* Per-export io stats use same ops as exports file */ 1353 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO}, 1354 [NFSD_Export_features] = {"export_features", 1355 &export_features_operations, S_IRUGO}, 1356 [NFSD_FO_UnlockIP] = {"unlock_ip", 1357 &transaction_ops, S_IWUSR|S_IRUSR}, 1358 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1359 &transaction_ops, S_IWUSR|S_IRUSR}, 1360 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1361 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1362 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1363 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1364 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO}, 1365 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1366 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1367 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1368 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO}, 1369 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE) 1370 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO}, 1371 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */ 1372 #ifdef CONFIG_NFSD_V4 1373 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1374 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1375 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1376 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO}, 1377 #endif 1378 /* last one */ {""} 1379 }; 1380 1381 ret = simple_fill_super(sb, 0x6e667364, nfsd_files); 1382 if (ret) 1383 return ret; 1384 dentry = nfsd_mkdir(sb->s_root, NULL, "clients"); 1385 if (IS_ERR(dentry)) 1386 return PTR_ERR(dentry); 1387 nn->nfsd_client_dir = dentry; 1388 return 0; 1389 } 1390 1391 static int nfsd_fs_get_tree(struct fs_context *fc) 1392 { 1393 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns)); 1394 } 1395 1396 static void nfsd_fs_free_fc(struct fs_context *fc) 1397 { 1398 if (fc->s_fs_info) 1399 put_net(fc->s_fs_info); 1400 } 1401 1402 static const struct fs_context_operations nfsd_fs_context_ops = { 1403 .free = nfsd_fs_free_fc, 1404 .get_tree = nfsd_fs_get_tree, 1405 }; 1406 1407 static int nfsd_init_fs_context(struct fs_context *fc) 1408 { 1409 put_user_ns(fc->user_ns); 1410 fc->user_ns = get_user_ns(fc->net_ns->user_ns); 1411 fc->ops = &nfsd_fs_context_ops; 1412 return 0; 1413 } 1414 1415 static void nfsd_umount(struct super_block *sb) 1416 { 1417 struct net *net = sb->s_fs_info; 1418 1419 kill_litter_super(sb); 1420 put_net(net); 1421 } 1422 1423 static struct file_system_type nfsd_fs_type = { 1424 .owner = THIS_MODULE, 1425 .name = "nfsd", 1426 .init_fs_context = nfsd_init_fs_context, 1427 .kill_sb = nfsd_umount, 1428 }; 1429 MODULE_ALIAS_FS("nfsd"); 1430 1431 int get_nfsdfs(struct net *net) 1432 { 1433 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1434 struct vfsmount *mnt; 1435 1436 mnt = vfs_kern_mount(&nfsd_fs_type, SB_KERNMOUNT, "nfsd", NULL); 1437 if (IS_ERR(mnt)) 1438 return PTR_ERR(mnt); 1439 nn->nfsd_mnt = mnt; 1440 return 0; 1441 } 1442 1443 #ifdef CONFIG_PROC_FS 1444 static int create_proc_exports_entry(void) 1445 { 1446 struct proc_dir_entry *entry; 1447 1448 entry = proc_mkdir("fs/nfs", NULL); 1449 if (!entry) 1450 return -ENOMEM; 1451 entry = proc_create("exports", 0, entry, &exports_proc_ops); 1452 if (!entry) { 1453 remove_proc_entry("fs/nfs", NULL); 1454 return -ENOMEM; 1455 } 1456 return 0; 1457 } 1458 #else /* CONFIG_PROC_FS */ 1459 static int create_proc_exports_entry(void) 1460 { 1461 return 0; 1462 } 1463 #endif 1464 1465 unsigned int nfsd_net_id; 1466 1467 static __net_init int nfsd_init_net(struct net *net) 1468 { 1469 int retval; 1470 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1471 1472 retval = nfsd_export_init(net); 1473 if (retval) 1474 goto out_export_error; 1475 retval = nfsd_idmap_init(net); 1476 if (retval) 1477 goto out_idmap_error; 1478 nn->nfsd_versions = NULL; 1479 nn->nfsd4_minorversions = NULL; 1480 retval = nfsd_reply_cache_init(nn); 1481 if (retval) 1482 goto out_drc_error; 1483 nn->nfsd4_lease = 90; /* default lease time */ 1484 nn->nfsd4_grace = 90; 1485 nn->somebody_reclaimed = false; 1486 nn->track_reclaim_completes = false; 1487 nn->clverifier_counter = prandom_u32(); 1488 nn->clientid_base = prandom_u32(); 1489 nn->clientid_counter = nn->clientid_base + 1; 1490 nn->s2s_cp_cl_id = nn->clientid_counter++; 1491 1492 atomic_set(&nn->ntf_refcnt, 0); 1493 init_waitqueue_head(&nn->ntf_wq); 1494 seqlock_init(&nn->boot_lock); 1495 1496 return 0; 1497 1498 out_drc_error: 1499 nfsd_idmap_shutdown(net); 1500 out_idmap_error: 1501 nfsd_export_shutdown(net); 1502 out_export_error: 1503 return retval; 1504 } 1505 1506 static __net_exit void nfsd_exit_net(struct net *net) 1507 { 1508 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1509 1510 nfsd_reply_cache_shutdown(nn); 1511 nfsd_idmap_shutdown(net); 1512 nfsd_export_shutdown(net); 1513 nfsd_netns_free_versions(net_generic(net, nfsd_net_id)); 1514 } 1515 1516 static struct pernet_operations nfsd_net_ops = { 1517 .init = nfsd_init_net, 1518 .exit = nfsd_exit_net, 1519 .id = &nfsd_net_id, 1520 .size = sizeof(struct nfsd_net), 1521 }; 1522 1523 static int __init init_nfsd(void) 1524 { 1525 int retval; 1526 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); 1527 1528 retval = register_cld_notifier(); 1529 if (retval) 1530 return retval; 1531 retval = nfsd4_init_slabs(); 1532 if (retval) 1533 goto out_unregister_notifier; 1534 retval = nfsd4_init_pnfs(); 1535 if (retval) 1536 goto out_free_slabs; 1537 retval = nfsd_stat_init(); /* Statistics */ 1538 if (retval) 1539 goto out_free_pnfs; 1540 retval = nfsd_drc_slab_create(); 1541 if (retval) 1542 goto out_free_stat; 1543 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 1544 retval = create_proc_exports_entry(); 1545 if (retval) 1546 goto out_free_lockd; 1547 retval = register_filesystem(&nfsd_fs_type); 1548 if (retval) 1549 goto out_free_exports; 1550 retval = register_pernet_subsys(&nfsd_net_ops); 1551 if (retval < 0) 1552 goto out_free_all; 1553 return 0; 1554 out_free_all: 1555 unregister_pernet_subsys(&nfsd_net_ops); 1556 out_free_exports: 1557 remove_proc_entry("fs/nfs/exports", NULL); 1558 remove_proc_entry("fs/nfs", NULL); 1559 out_free_lockd: 1560 nfsd_lockd_shutdown(); 1561 nfsd_drc_slab_free(); 1562 out_free_stat: 1563 nfsd_stat_shutdown(); 1564 out_free_pnfs: 1565 nfsd4_exit_pnfs(); 1566 out_free_slabs: 1567 nfsd4_free_slabs(); 1568 out_unregister_notifier: 1569 unregister_cld_notifier(); 1570 return retval; 1571 } 1572 1573 static void __exit exit_nfsd(void) 1574 { 1575 unregister_pernet_subsys(&nfsd_net_ops); 1576 nfsd_drc_slab_free(); 1577 remove_proc_entry("fs/nfs/exports", NULL); 1578 remove_proc_entry("fs/nfs", NULL); 1579 nfsd_stat_shutdown(); 1580 nfsd_lockd_shutdown(); 1581 nfsd4_free_slabs(); 1582 nfsd4_exit_pnfs(); 1583 unregister_filesystem(&nfsd_fs_type); 1584 unregister_cld_notifier(); 1585 } 1586 1587 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1588 MODULE_LICENSE("GPL"); 1589 module_init(init_nfsd) 1590 module_exit(exit_nfsd) 1591