1 /* 2 * Syscall interface to knfsd. 3 * 4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 5 */ 6 7 #include <linux/slab.h> 8 #include <linux/namei.h> 9 #include <linux/ctype.h> 10 11 #include <linux/nfsd_idmap.h> 12 #include <linux/sunrpc/svcsock.h> 13 #include <linux/nfsd/syscall.h> 14 #include <linux/lockd/lockd.h> 15 #include <linux/sunrpc/clnt.h> 16 17 #include "nfsd.h" 18 #include "cache.h" 19 20 /* 21 * We have a single directory with 9 nodes in it. 22 */ 23 enum { 24 NFSD_Root = 1, 25 NFSD_Svc, 26 NFSD_Add, 27 NFSD_Del, 28 NFSD_Export, 29 NFSD_Unexport, 30 NFSD_Getfd, 31 NFSD_Getfs, 32 NFSD_List, 33 NFSD_Export_features, 34 NFSD_Fh, 35 NFSD_FO_UnlockIP, 36 NFSD_FO_UnlockFS, 37 NFSD_Threads, 38 NFSD_Pool_Threads, 39 NFSD_Pool_Stats, 40 NFSD_Versions, 41 NFSD_Ports, 42 NFSD_MaxBlkSize, 43 /* 44 * The below MUST come last. Otherwise we leave a hole in nfsd_files[] 45 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops 46 */ 47 #ifdef CONFIG_NFSD_V4 48 NFSD_Leasetime, 49 NFSD_Gracetime, 50 NFSD_RecoveryDir, 51 #endif 52 }; 53 54 /* 55 * write() for these nodes. 56 */ 57 static ssize_t write_svc(struct file *file, char *buf, size_t size); 58 static ssize_t write_add(struct file *file, char *buf, size_t size); 59 static ssize_t write_del(struct file *file, char *buf, size_t size); 60 static ssize_t write_export(struct file *file, char *buf, size_t size); 61 static ssize_t write_unexport(struct file *file, char *buf, size_t size); 62 static ssize_t write_getfd(struct file *file, char *buf, size_t size); 63 static ssize_t write_getfs(struct file *file, char *buf, size_t size); 64 static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 65 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); 66 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); 67 static ssize_t write_threads(struct file *file, char *buf, size_t size); 68 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 69 static ssize_t write_versions(struct file *file, char *buf, size_t size); 70 static ssize_t write_ports(struct file *file, char *buf, size_t size); 71 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 72 #ifdef CONFIG_NFSD_V4 73 static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 74 static ssize_t write_gracetime(struct file *file, char *buf, size_t size); 75 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 76 #endif 77 78 static ssize_t (*write_op[])(struct file *, char *, size_t) = { 79 [NFSD_Svc] = write_svc, 80 [NFSD_Add] = write_add, 81 [NFSD_Del] = write_del, 82 [NFSD_Export] = write_export, 83 [NFSD_Unexport] = write_unexport, 84 [NFSD_Getfd] = write_getfd, 85 [NFSD_Getfs] = write_getfs, 86 [NFSD_Fh] = write_filehandle, 87 [NFSD_FO_UnlockIP] = write_unlock_ip, 88 [NFSD_FO_UnlockFS] = write_unlock_fs, 89 [NFSD_Threads] = write_threads, 90 [NFSD_Pool_Threads] = write_pool_threads, 91 [NFSD_Versions] = write_versions, 92 [NFSD_Ports] = write_ports, 93 [NFSD_MaxBlkSize] = write_maxblksize, 94 #ifdef CONFIG_NFSD_V4 95 [NFSD_Leasetime] = write_leasetime, 96 [NFSD_Gracetime] = write_gracetime, 97 [NFSD_RecoveryDir] = write_recoverydir, 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->f_path.dentry->d_inode->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 }; 141 142 static int exports_open(struct inode *inode, struct file *file) 143 { 144 return seq_open(file, &nfs_exports_op); 145 } 146 147 static const struct file_operations exports_operations = { 148 .open = exports_open, 149 .read = seq_read, 150 .llseek = seq_lseek, 151 .release = seq_release, 152 .owner = THIS_MODULE, 153 }; 154 155 static int export_features_show(struct seq_file *m, void *v) 156 { 157 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS); 158 return 0; 159 } 160 161 static int export_features_open(struct inode *inode, struct file *file) 162 { 163 return single_open(file, export_features_show, NULL); 164 } 165 166 static struct file_operations export_features_operations = { 167 .open = export_features_open, 168 .read = seq_read, 169 .llseek = seq_lseek, 170 .release = single_release, 171 }; 172 173 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file); 174 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file); 175 176 static const struct file_operations pool_stats_operations = { 177 .open = nfsd_pool_stats_open, 178 .read = seq_read, 179 .llseek = seq_lseek, 180 .release = nfsd_pool_stats_release, 181 .owner = THIS_MODULE, 182 }; 183 184 /*----------------------------------------------------------------------------*/ 185 /* 186 * payload - write methods 187 */ 188 189 /** 190 * write_svc - Start kernel's NFSD server 191 * 192 * Deprecated. /proc/fs/nfsd/threads is preferred. 193 * Function remains to support old versions of nfs-utils. 194 * 195 * Input: 196 * buf: struct nfsctl_svc 197 * svc_port: port number of this 198 * server's listener 199 * svc_nthreads: number of threads to start 200 * size: size in bytes of passed in nfsctl_svc 201 * Output: 202 * On success: returns zero 203 * On error: return code is negative errno value 204 */ 205 static ssize_t write_svc(struct file *file, char *buf, size_t size) 206 { 207 struct nfsctl_svc *data; 208 int err; 209 if (size < sizeof(*data)) 210 return -EINVAL; 211 data = (struct nfsctl_svc*) buf; 212 err = nfsd_svc(data->svc_port, data->svc_nthreads); 213 if (err < 0) 214 return err; 215 return 0; 216 } 217 218 /** 219 * write_add - Add or modify client entry in auth unix cache 220 * 221 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred. 222 * Function remains to support old versions of nfs-utils. 223 * 224 * Input: 225 * buf: struct nfsctl_client 226 * cl_ident: '\0'-terminated C string 227 * containing domain name 228 * of client 229 * cl_naddr: no. of items in cl_addrlist 230 * cl_addrlist: array of client addresses 231 * cl_fhkeytype: ignored 232 * cl_fhkeylen: ignored 233 * cl_fhkey: ignored 234 * size: size in bytes of passed in nfsctl_client 235 * Output: 236 * On success: returns zero 237 * On error: return code is negative errno value 238 * 239 * Note: Only AF_INET client addresses are passed in, since 240 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses. 241 */ 242 static ssize_t write_add(struct file *file, char *buf, size_t size) 243 { 244 struct nfsctl_client *data; 245 if (size < sizeof(*data)) 246 return -EINVAL; 247 data = (struct nfsctl_client *)buf; 248 return exp_addclient(data); 249 } 250 251 /** 252 * write_del - Remove client from auth unix cache 253 * 254 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred. 255 * Function remains to support old versions of nfs-utils. 256 * 257 * Input: 258 * buf: struct nfsctl_client 259 * cl_ident: '\0'-terminated C string 260 * containing domain name 261 * of client 262 * cl_naddr: ignored 263 * cl_addrlist: ignored 264 * cl_fhkeytype: ignored 265 * cl_fhkeylen: ignored 266 * cl_fhkey: ignored 267 * size: size in bytes of passed in nfsctl_client 268 * Output: 269 * On success: returns zero 270 * On error: return code is negative errno value 271 * 272 * Note: Only AF_INET client addresses are passed in, since 273 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses. 274 */ 275 static ssize_t write_del(struct file *file, char *buf, size_t size) 276 { 277 struct nfsctl_client *data; 278 if (size < sizeof(*data)) 279 return -EINVAL; 280 data = (struct nfsctl_client *)buf; 281 return exp_delclient(data); 282 } 283 284 /** 285 * write_export - Export part or all of a local file system 286 * 287 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred. 288 * Function remains to support old versions of nfs-utils. 289 * 290 * Input: 291 * buf: struct nfsctl_export 292 * ex_client: '\0'-terminated C string 293 * containing domain name 294 * of client allowed to access 295 * this export 296 * ex_path: '\0'-terminated C string 297 * containing pathname of 298 * directory in local file system 299 * ex_dev: fsid to use for this export 300 * ex_ino: ignored 301 * ex_flags: export flags for this export 302 * ex_anon_uid: UID to use for anonymous 303 * requests 304 * ex_anon_gid: GID to use for anonymous 305 * requests 306 * size: size in bytes of passed in nfsctl_export 307 * Output: 308 * On success: returns zero 309 * On error: return code is negative errno value 310 */ 311 static ssize_t write_export(struct file *file, char *buf, size_t size) 312 { 313 struct nfsctl_export *data; 314 if (size < sizeof(*data)) 315 return -EINVAL; 316 data = (struct nfsctl_export*)buf; 317 return exp_export(data); 318 } 319 320 /** 321 * write_unexport - Unexport a previously exported file system 322 * 323 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred. 324 * Function remains to support old versions of nfs-utils. 325 * 326 * Input: 327 * buf: struct nfsctl_export 328 * ex_client: '\0'-terminated C string 329 * containing domain name 330 * of client no longer allowed 331 * to access this export 332 * ex_path: '\0'-terminated C string 333 * containing pathname of 334 * directory in local file system 335 * ex_dev: ignored 336 * ex_ino: ignored 337 * ex_flags: ignored 338 * ex_anon_uid: ignored 339 * ex_anon_gid: ignored 340 * size: size in bytes of passed in nfsctl_export 341 * Output: 342 * On success: returns zero 343 * On error: return code is negative errno value 344 */ 345 static ssize_t write_unexport(struct file *file, char *buf, size_t size) 346 { 347 struct nfsctl_export *data; 348 349 if (size < sizeof(*data)) 350 return -EINVAL; 351 data = (struct nfsctl_export*)buf; 352 return exp_unexport(data); 353 } 354 355 /** 356 * write_getfs - Get a variable-length NFS file handle by path 357 * 358 * Deprecated. /proc/fs/nfsd/filehandle is preferred. 359 * Function remains to support old versions of nfs-utils. 360 * 361 * Input: 362 * buf: struct nfsctl_fsparm 363 * gd_addr: socket address of client 364 * gd_path: '\0'-terminated C string 365 * containing pathname of 366 * directory in local file system 367 * gd_maxlen: maximum size of returned file 368 * handle 369 * size: size in bytes of passed in nfsctl_fsparm 370 * Output: 371 * On success: passed-in buffer filled with a knfsd_fh structure 372 * (a variable-length raw NFS file handle); 373 * return code is the size in bytes of the file handle 374 * On error: return code is negative errno value 375 * 376 * Note: Only AF_INET client addresses are passed in, since gd_addr 377 * is the same size as a struct sockaddr_in. 378 */ 379 static ssize_t write_getfs(struct file *file, char *buf, size_t size) 380 { 381 struct nfsctl_fsparm *data; 382 struct sockaddr_in *sin; 383 struct auth_domain *clp; 384 int err = 0; 385 struct knfsd_fh *res; 386 struct in6_addr in6; 387 388 if (size < sizeof(*data)) 389 return -EINVAL; 390 data = (struct nfsctl_fsparm*)buf; 391 err = -EPROTONOSUPPORT; 392 if (data->gd_addr.sa_family != AF_INET) 393 goto out; 394 sin = (struct sockaddr_in *)&data->gd_addr; 395 if (data->gd_maxlen > NFS3_FHSIZE) 396 data->gd_maxlen = NFS3_FHSIZE; 397 398 res = (struct knfsd_fh*)buf; 399 400 exp_readlock(); 401 402 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6); 403 404 clp = auth_unix_lookup(&in6); 405 if (!clp) 406 err = -EPERM; 407 else { 408 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen); 409 auth_domain_put(clp); 410 } 411 exp_readunlock(); 412 if (err == 0) 413 err = res->fh_size + offsetof(struct knfsd_fh, fh_base); 414 out: 415 return err; 416 } 417 418 /** 419 * write_getfd - Get a fixed-length NFS file handle by path (used by mountd) 420 * 421 * Deprecated. /proc/fs/nfsd/filehandle is preferred. 422 * Function remains to support old versions of nfs-utils. 423 * 424 * Input: 425 * buf: struct nfsctl_fdparm 426 * gd_addr: socket address of client 427 * gd_path: '\0'-terminated C string 428 * containing pathname of 429 * directory in local file system 430 * gd_version: fdparm structure version 431 * size: size in bytes of passed in nfsctl_fdparm 432 * Output: 433 * On success: passed-in buffer filled with nfsctl_res 434 * (a fixed-length raw NFS file handle); 435 * return code is the size in bytes of the file handle 436 * On error: return code is negative errno value 437 * 438 * Note: Only AF_INET client addresses are passed in, since gd_addr 439 * is the same size as a struct sockaddr_in. 440 */ 441 static ssize_t write_getfd(struct file *file, char *buf, size_t size) 442 { 443 struct nfsctl_fdparm *data; 444 struct sockaddr_in *sin; 445 struct auth_domain *clp; 446 int err = 0; 447 struct knfsd_fh fh; 448 char *res; 449 struct in6_addr in6; 450 451 if (size < sizeof(*data)) 452 return -EINVAL; 453 data = (struct nfsctl_fdparm*)buf; 454 err = -EPROTONOSUPPORT; 455 if (data->gd_addr.sa_family != AF_INET) 456 goto out; 457 err = -EINVAL; 458 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS) 459 goto out; 460 461 res = buf; 462 sin = (struct sockaddr_in *)&data->gd_addr; 463 exp_readlock(); 464 465 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6); 466 467 clp = auth_unix_lookup(&in6); 468 if (!clp) 469 err = -EPERM; 470 else { 471 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE); 472 auth_domain_put(clp); 473 } 474 exp_readunlock(); 475 476 if (err == 0) { 477 memset(res,0, NFS_FHSIZE); 478 memcpy(res, &fh.fh_base, fh.fh_size); 479 err = NFS_FHSIZE; 480 } 481 out: 482 return err; 483 } 484 485 /** 486 * write_unlock_ip - Release all locks used by a client 487 * 488 * Experimental. 489 * 490 * Input: 491 * buf: '\n'-terminated C string containing a 492 * presentation format IP address 493 * size: length of C string in @buf 494 * Output: 495 * On success: returns zero if all specified locks were released; 496 * returns one if one or more locks were not released 497 * On error: return code is negative errno value 498 */ 499 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) 500 { 501 struct sockaddr_storage address; 502 struct sockaddr *sap = (struct sockaddr *)&address; 503 size_t salen = sizeof(address); 504 char *fo_path; 505 506 /* sanity check */ 507 if (size == 0) 508 return -EINVAL; 509 510 if (buf[size-1] != '\n') 511 return -EINVAL; 512 513 fo_path = buf; 514 if (qword_get(&buf, fo_path, size) < 0) 515 return -EINVAL; 516 517 if (rpc_pton(fo_path, size, sap, salen) == 0) 518 return -EINVAL; 519 520 return nlmsvc_unlock_all_by_ip(sap); 521 } 522 523 /** 524 * write_unlock_fs - Release all locks on a local file system 525 * 526 * Experimental. 527 * 528 * Input: 529 * buf: '\n'-terminated C string containing the 530 * absolute pathname of a local file system 531 * size: length of C string in @buf 532 * Output: 533 * On success: returns zero if all specified locks were released; 534 * returns one if one or more locks were not released 535 * On error: return code is negative errno value 536 */ 537 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size) 538 { 539 struct path path; 540 char *fo_path; 541 int error; 542 543 /* sanity check */ 544 if (size == 0) 545 return -EINVAL; 546 547 if (buf[size-1] != '\n') 548 return -EINVAL; 549 550 fo_path = buf; 551 if (qword_get(&buf, fo_path, size) < 0) 552 return -EINVAL; 553 554 error = kern_path(fo_path, 0, &path); 555 if (error) 556 return error; 557 558 /* 559 * XXX: Needs better sanity checking. Otherwise we could end up 560 * releasing locks on the wrong file system. 561 * 562 * For example: 563 * 1. Does the path refer to a directory? 564 * 2. Is that directory a mount point, or 565 * 3. Is that directory the root of an exported file system? 566 */ 567 error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb); 568 569 path_put(&path); 570 return error; 571 } 572 573 /** 574 * write_filehandle - Get a variable-length NFS file handle by path 575 * 576 * On input, the buffer contains a '\n'-terminated C string comprised of 577 * three alphanumeric words separated by whitespace. The string may 578 * contain escape sequences. 579 * 580 * Input: 581 * buf: 582 * domain: client domain name 583 * path: export pathname 584 * maxsize: numeric maximum size of 585 * @buf 586 * size: length of C string in @buf 587 * Output: 588 * On success: passed-in buffer filled with '\n'-terminated C 589 * string containing a ASCII hex text version 590 * of the NFS file handle; 591 * return code is the size in bytes of the string 592 * On error: return code is negative errno value 593 */ 594 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 595 { 596 char *dname, *path; 597 int uninitialized_var(maxsize); 598 char *mesg = buf; 599 int len; 600 struct auth_domain *dom; 601 struct knfsd_fh fh; 602 603 if (size == 0) 604 return -EINVAL; 605 606 if (buf[size-1] != '\n') 607 return -EINVAL; 608 buf[size-1] = 0; 609 610 dname = mesg; 611 len = qword_get(&mesg, dname, size); 612 if (len <= 0) 613 return -EINVAL; 614 615 path = dname+len+1; 616 len = qword_get(&mesg, path, size); 617 if (len <= 0) 618 return -EINVAL; 619 620 len = get_int(&mesg, &maxsize); 621 if (len) 622 return len; 623 624 if (maxsize < NFS_FHSIZE) 625 return -EINVAL; 626 if (maxsize > NFS3_FHSIZE) 627 maxsize = NFS3_FHSIZE; 628 629 if (qword_get(&mesg, mesg, size)>0) 630 return -EINVAL; 631 632 /* we have all the words, they are in buf.. */ 633 dom = unix_domain_find(dname); 634 if (!dom) 635 return -ENOMEM; 636 637 len = exp_rootfh(dom, path, &fh, maxsize); 638 auth_domain_put(dom); 639 if (len) 640 return len; 641 642 mesg = buf; 643 len = SIMPLE_TRANSACTION_LIMIT; 644 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); 645 mesg[-1] = '\n'; 646 return mesg - buf; 647 } 648 649 /** 650 * write_threads - Start NFSD, or report the current number of running threads 651 * 652 * Input: 653 * buf: ignored 654 * size: zero 655 * Output: 656 * On success: passed-in buffer filled with '\n'-terminated C 657 * string numeric value representing the number of 658 * running NFSD threads; 659 * return code is the size in bytes of the string 660 * On error: return code is zero 661 * 662 * OR 663 * 664 * Input: 665 * buf: C string containing an unsigned 666 * integer value representing the 667 * number of NFSD threads to start 668 * size: non-zero length of C string in @buf 669 * Output: 670 * On success: NFS service is started; 671 * passed-in buffer filled with '\n'-terminated C 672 * string numeric value representing the number of 673 * running NFSD threads; 674 * return code is the size in bytes of the string 675 * On error: return code is zero or a negative errno value 676 */ 677 static ssize_t write_threads(struct file *file, char *buf, size_t size) 678 { 679 char *mesg = buf; 680 int rv; 681 if (size > 0) { 682 int newthreads; 683 rv = get_int(&mesg, &newthreads); 684 if (rv) 685 return rv; 686 if (newthreads < 0) 687 return -EINVAL; 688 rv = nfsd_svc(NFS_PORT, newthreads); 689 if (rv < 0) 690 return rv; 691 } else 692 rv = nfsd_nrthreads(); 693 694 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); 695 } 696 697 /** 698 * write_pool_threads - Set or report the current number of threads per pool 699 * 700 * Input: 701 * buf: ignored 702 * size: zero 703 * 704 * OR 705 * 706 * Input: 707 * buf: C string containing whitespace- 708 * separated unsigned integer values 709 * representing the number of NFSD 710 * threads to start in each pool 711 * size: non-zero length of C string in @buf 712 * Output: 713 * On success: passed-in buffer filled with '\n'-terminated C 714 * string containing integer values representing the 715 * number of NFSD threads in each pool; 716 * return code is the size in bytes of the string 717 * On error: return code is zero or a negative errno value 718 */ 719 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 720 { 721 /* if size > 0, look for an array of number of threads per node 722 * and apply them then write out number of threads per node as reply 723 */ 724 char *mesg = buf; 725 int i; 726 int rv; 727 int len; 728 int npools; 729 int *nthreads; 730 731 mutex_lock(&nfsd_mutex); 732 npools = nfsd_nrpools(); 733 if (npools == 0) { 734 /* 735 * NFS is shut down. The admin can start it by 736 * writing to the threads file but NOT the pool_threads 737 * file, sorry. Report zero threads. 738 */ 739 mutex_unlock(&nfsd_mutex); 740 strcpy(buf, "0\n"); 741 return strlen(buf); 742 } 743 744 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); 745 rv = -ENOMEM; 746 if (nthreads == NULL) 747 goto out_free; 748 749 if (size > 0) { 750 for (i = 0; i < npools; i++) { 751 rv = get_int(&mesg, &nthreads[i]); 752 if (rv == -ENOENT) 753 break; /* fewer numbers than pools */ 754 if (rv) 755 goto out_free; /* syntax error */ 756 rv = -EINVAL; 757 if (nthreads[i] < 0) 758 goto out_free; 759 } 760 rv = nfsd_set_nrthreads(i, nthreads); 761 if (rv) 762 goto out_free; 763 } 764 765 rv = nfsd_get_nrthreads(npools, nthreads); 766 if (rv) 767 goto out_free; 768 769 mesg = buf; 770 size = SIMPLE_TRANSACTION_LIMIT; 771 for (i = 0; i < npools && size > 0; i++) { 772 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 773 len = strlen(mesg); 774 size -= len; 775 mesg += len; 776 } 777 rv = mesg - buf; 778 out_free: 779 kfree(nthreads); 780 mutex_unlock(&nfsd_mutex); 781 return rv; 782 } 783 784 static ssize_t __write_versions(struct file *file, char *buf, size_t size) 785 { 786 char *mesg = buf; 787 char *vers, *minorp, sign; 788 int len, num, remaining; 789 unsigned minor; 790 ssize_t tlen = 0; 791 char *sep; 792 793 if (size>0) { 794 if (nfsd_serv) 795 /* Cannot change versions without updating 796 * nfsd_serv->sv_xdrsize, and reallocing 797 * rq_argp and rq_resp 798 */ 799 return -EBUSY; 800 if (buf[size-1] != '\n') 801 return -EINVAL; 802 buf[size-1] = 0; 803 804 vers = mesg; 805 len = qword_get(&mesg, vers, size); 806 if (len <= 0) return -EINVAL; 807 do { 808 sign = *vers; 809 if (sign == '+' || sign == '-') 810 num = simple_strtol((vers+1), &minorp, 0); 811 else 812 num = simple_strtol(vers, &minorp, 0); 813 if (*minorp == '.') { 814 if (num < 4) 815 return -EINVAL; 816 minor = simple_strtoul(minorp+1, NULL, 0); 817 if (minor == 0) 818 return -EINVAL; 819 if (nfsd_minorversion(minor, sign == '-' ? 820 NFSD_CLEAR : NFSD_SET) < 0) 821 return -EINVAL; 822 goto next; 823 } 824 switch(num) { 825 case 2: 826 case 3: 827 case 4: 828 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET); 829 break; 830 default: 831 return -EINVAL; 832 } 833 next: 834 vers += len + 1; 835 } while ((len = qword_get(&mesg, vers, size)) > 0); 836 /* If all get turned off, turn them back on, as 837 * having no versions is BAD 838 */ 839 nfsd_reset_versions(); 840 } 841 842 /* Now write current state into reply buffer */ 843 len = 0; 844 sep = ""; 845 remaining = SIMPLE_TRANSACTION_LIMIT; 846 for (num=2 ; num <= 4 ; num++) 847 if (nfsd_vers(num, NFSD_AVAIL)) { 848 len = snprintf(buf, remaining, "%s%c%d", sep, 849 nfsd_vers(num, NFSD_TEST)?'+':'-', 850 num); 851 sep = " "; 852 853 if (len > remaining) 854 break; 855 remaining -= len; 856 buf += len; 857 tlen += len; 858 } 859 if (nfsd_vers(4, NFSD_AVAIL)) 860 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION; 861 minor++) { 862 len = snprintf(buf, remaining, " %c4.%u", 863 (nfsd_vers(4, NFSD_TEST) && 864 nfsd_minorversion(minor, NFSD_TEST)) ? 865 '+' : '-', 866 minor); 867 868 if (len > remaining) 869 break; 870 remaining -= len; 871 buf += len; 872 tlen += len; 873 } 874 875 len = snprintf(buf, remaining, "\n"); 876 if (len > remaining) 877 return -EINVAL; 878 return tlen + len; 879 } 880 881 /** 882 * write_versions - Set or report the available NFS protocol versions 883 * 884 * Input: 885 * buf: ignored 886 * size: zero 887 * Output: 888 * On success: passed-in buffer filled with '\n'-terminated C 889 * string containing positive or negative integer 890 * values representing the current status of each 891 * protocol version; 892 * return code is the size in bytes of the string 893 * On error: return code is zero or a negative errno value 894 * 895 * OR 896 * 897 * Input: 898 * buf: C string containing whitespace- 899 * separated positive or negative 900 * integer values representing NFS 901 * protocol versions to enable ("+n") 902 * or disable ("-n") 903 * size: non-zero length of C string in @buf 904 * Output: 905 * On success: status of zero or more protocol versions has 906 * been updated; passed-in buffer filled with 907 * '\n'-terminated C string containing positive 908 * or negative integer values representing the 909 * current status of each protocol version; 910 * return code is the size in bytes of the string 911 * On error: return code is zero or a negative errno value 912 */ 913 static ssize_t write_versions(struct file *file, char *buf, size_t size) 914 { 915 ssize_t rv; 916 917 mutex_lock(&nfsd_mutex); 918 rv = __write_versions(file, buf, size); 919 mutex_unlock(&nfsd_mutex); 920 return rv; 921 } 922 923 /* 924 * Zero-length write. Return a list of NFSD's current listener 925 * transports. 926 */ 927 static ssize_t __write_ports_names(char *buf) 928 { 929 if (nfsd_serv == NULL) 930 return 0; 931 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); 932 } 933 934 /* 935 * A single 'fd' number was written, in which case it must be for 936 * a socket of a supported family/protocol, and we use it as an 937 * nfsd listener. 938 */ 939 static ssize_t __write_ports_addfd(char *buf) 940 { 941 char *mesg = buf; 942 int fd, err; 943 944 err = get_int(&mesg, &fd); 945 if (err != 0 || fd < 0) 946 return -EINVAL; 947 948 err = nfsd_create_serv(); 949 if (err != 0) 950 return err; 951 952 err = lockd_up(); 953 if (err != 0) 954 goto out; 955 956 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT); 957 if (err < 0) 958 lockd_down(); 959 960 out: 961 /* Decrease the count, but don't shut down the service */ 962 nfsd_serv->sv_nrthreads--; 963 return err; 964 } 965 966 /* 967 * A '-' followed by the 'name' of a socket means we close the socket. 968 */ 969 static ssize_t __write_ports_delfd(char *buf) 970 { 971 char *toclose; 972 int len = 0; 973 974 toclose = kstrdup(buf + 1, GFP_KERNEL); 975 if (toclose == NULL) 976 return -ENOMEM; 977 978 if (nfsd_serv != NULL) 979 len = svc_sock_names(nfsd_serv, buf, 980 SIMPLE_TRANSACTION_LIMIT, toclose); 981 if (len >= 0) 982 lockd_down(); 983 984 kfree(toclose); 985 return len; 986 } 987 988 /* 989 * A transport listener is added by writing it's transport name and 990 * a port number. 991 */ 992 static ssize_t __write_ports_addxprt(char *buf) 993 { 994 char transport[16]; 995 struct svc_xprt *xprt; 996 int port, err; 997 998 if (sscanf(buf, "%15s %4u", transport, &port) != 2) 999 return -EINVAL; 1000 1001 if (port < 1 || port > USHRT_MAX) 1002 return -EINVAL; 1003 1004 err = nfsd_create_serv(); 1005 if (err != 0) 1006 return err; 1007 1008 err = svc_create_xprt(nfsd_serv, transport, 1009 PF_INET, port, SVC_SOCK_ANONYMOUS); 1010 if (err < 0) 1011 goto out_err; 1012 1013 err = svc_create_xprt(nfsd_serv, transport, 1014 PF_INET6, port, SVC_SOCK_ANONYMOUS); 1015 if (err < 0 && err != -EAFNOSUPPORT) 1016 goto out_close; 1017 return 0; 1018 out_close: 1019 xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port); 1020 if (xprt != NULL) { 1021 svc_close_xprt(xprt); 1022 svc_xprt_put(xprt); 1023 } 1024 out_err: 1025 /* Decrease the count, but don't shut down the service */ 1026 nfsd_serv->sv_nrthreads--; 1027 return err; 1028 } 1029 1030 /* 1031 * A transport listener is removed by writing a "-", it's transport 1032 * name, and it's port number. 1033 */ 1034 static ssize_t __write_ports_delxprt(char *buf) 1035 { 1036 struct svc_xprt *xprt; 1037 char transport[16]; 1038 int port; 1039 1040 if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2) 1041 return -EINVAL; 1042 1043 if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL) 1044 return -EINVAL; 1045 1046 xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port); 1047 if (xprt == NULL) 1048 return -ENOTCONN; 1049 1050 svc_close_xprt(xprt); 1051 svc_xprt_put(xprt); 1052 return 0; 1053 } 1054 1055 static ssize_t __write_ports(struct file *file, char *buf, size_t size) 1056 { 1057 if (size == 0) 1058 return __write_ports_names(buf); 1059 1060 if (isdigit(buf[0])) 1061 return __write_ports_addfd(buf); 1062 1063 if (buf[0] == '-' && isdigit(buf[1])) 1064 return __write_ports_delfd(buf); 1065 1066 if (isalpha(buf[0])) 1067 return __write_ports_addxprt(buf); 1068 1069 if (buf[0] == '-' && isalpha(buf[1])) 1070 return __write_ports_delxprt(buf); 1071 1072 return -EINVAL; 1073 } 1074 1075 /** 1076 * write_ports - Pass a socket file descriptor or transport name to listen on 1077 * 1078 * Input: 1079 * buf: ignored 1080 * size: zero 1081 * Output: 1082 * On success: passed-in buffer filled with a '\n'-terminated C 1083 * string containing a whitespace-separated list of 1084 * named NFSD listeners; 1085 * return code is the size in bytes of the string 1086 * On error: return code is zero or a negative errno value 1087 * 1088 * OR 1089 * 1090 * Input: 1091 * buf: C string containing an unsigned 1092 * integer value representing a bound 1093 * but unconnected socket that is to be 1094 * used as an NFSD listener; listen(3) 1095 * must be called for a SOCK_STREAM 1096 * socket, otherwise it is ignored 1097 * size: non-zero length of C string in @buf 1098 * Output: 1099 * On success: NFS service is started; 1100 * passed-in buffer filled with a '\n'-terminated C 1101 * string containing a unique alphanumeric name of 1102 * the listener; 1103 * return code is the size in bytes of the string 1104 * On error: return code is a negative errno value 1105 * 1106 * OR 1107 * 1108 * Input: 1109 * buf: C string containing a "-" followed 1110 * by an integer value representing a 1111 * previously passed in socket file 1112 * descriptor 1113 * size: non-zero length of C string in @buf 1114 * Output: 1115 * On success: NFS service no longer listens on that socket; 1116 * passed-in buffer filled with a '\n'-terminated C 1117 * string containing a unique name of the listener; 1118 * return code is the size in bytes of the string 1119 * On error: return code is a negative errno value 1120 * 1121 * OR 1122 * 1123 * Input: 1124 * buf: C string containing a transport 1125 * name and an unsigned integer value 1126 * representing the port to listen on, 1127 * separated by whitespace 1128 * size: non-zero length of C string in @buf 1129 * Output: 1130 * On success: returns zero; NFS service is started 1131 * On error: return code is a negative errno value 1132 * 1133 * OR 1134 * 1135 * Input: 1136 * buf: C string containing a "-" followed 1137 * by a transport name and an unsigned 1138 * integer value representing the port 1139 * to listen on, separated by whitespace 1140 * size: non-zero length of C string in @buf 1141 * Output: 1142 * On success: returns zero; NFS service no longer listens 1143 * on that transport 1144 * On error: return code is a negative errno value 1145 */ 1146 static ssize_t write_ports(struct file *file, char *buf, size_t size) 1147 { 1148 ssize_t rv; 1149 1150 mutex_lock(&nfsd_mutex); 1151 rv = __write_ports(file, buf, size); 1152 mutex_unlock(&nfsd_mutex); 1153 return rv; 1154 } 1155 1156 1157 int nfsd_max_blksize; 1158 1159 /** 1160 * write_maxblksize - Set or report the current NFS blksize 1161 * 1162 * Input: 1163 * buf: ignored 1164 * size: zero 1165 * 1166 * OR 1167 * 1168 * Input: 1169 * buf: C string containing an unsigned 1170 * integer value representing the new 1171 * NFS blksize 1172 * size: non-zero length of C string in @buf 1173 * Output: 1174 * On success: passed-in buffer filled with '\n'-terminated C string 1175 * containing numeric value of the current NFS blksize 1176 * setting; 1177 * return code is the size in bytes of the string 1178 * On error: return code is zero or a negative errno value 1179 */ 1180 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 1181 { 1182 char *mesg = buf; 1183 if (size > 0) { 1184 int bsize; 1185 int rv = get_int(&mesg, &bsize); 1186 if (rv) 1187 return rv; 1188 /* force bsize into allowed range and 1189 * required alignment. 1190 */ 1191 if (bsize < 1024) 1192 bsize = 1024; 1193 if (bsize > NFSSVC_MAXBLKSIZE) 1194 bsize = NFSSVC_MAXBLKSIZE; 1195 bsize &= ~(1024-1); 1196 mutex_lock(&nfsd_mutex); 1197 if (nfsd_serv && nfsd_serv->sv_nrthreads) { 1198 mutex_unlock(&nfsd_mutex); 1199 return -EBUSY; 1200 } 1201 nfsd_max_blksize = bsize; 1202 mutex_unlock(&nfsd_mutex); 1203 } 1204 1205 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 1206 nfsd_max_blksize); 1207 } 1208 1209 #ifdef CONFIG_NFSD_V4 1210 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time) 1211 { 1212 char *mesg = buf; 1213 int rv, i; 1214 1215 if (size > 0) { 1216 if (nfsd_serv) 1217 return -EBUSY; 1218 rv = get_int(&mesg, &i); 1219 if (rv) 1220 return rv; 1221 /* 1222 * Some sanity checking. We don't have a reason for 1223 * these particular numbers, but problems with the 1224 * extremes are: 1225 * - Too short: the briefest network outage may 1226 * cause clients to lose all their locks. Also, 1227 * the frequent polling may be wasteful. 1228 * - Too long: do you really want reboot recovery 1229 * to take more than an hour? Or to make other 1230 * clients wait an hour before being able to 1231 * revoke a dead client's locks? 1232 */ 1233 if (i < 10 || i > 3600) 1234 return -EINVAL; 1235 *time = i; 1236 } 1237 1238 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time); 1239 } 1240 1241 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time) 1242 { 1243 ssize_t rv; 1244 1245 mutex_lock(&nfsd_mutex); 1246 rv = __nfsd4_write_time(file, buf, size, time); 1247 mutex_unlock(&nfsd_mutex); 1248 return rv; 1249 } 1250 1251 /** 1252 * write_leasetime - Set or report the current NFSv4 lease time 1253 * 1254 * Input: 1255 * buf: ignored 1256 * size: zero 1257 * 1258 * OR 1259 * 1260 * Input: 1261 * buf: C string containing an unsigned 1262 * integer value representing the new 1263 * NFSv4 lease expiry time 1264 * size: non-zero length of C string in @buf 1265 * Output: 1266 * On success: passed-in buffer filled with '\n'-terminated C 1267 * string containing unsigned integer value of the 1268 * current lease expiry time; 1269 * return code is the size in bytes of the string 1270 * On error: return code is zero or a negative errno value 1271 */ 1272 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 1273 { 1274 return nfsd4_write_time(file, buf, size, &nfsd4_lease); 1275 } 1276 1277 /** 1278 * write_gracetime - Set or report current NFSv4 grace period time 1279 * 1280 * As above, but sets the time of the NFSv4 grace period. 1281 * 1282 * Note this should never be set to less than the *previous* 1283 * lease-period time, but we don't try to enforce this. (In the common 1284 * case (a new boot), we don't know what the previous lease time was 1285 * anyway.) 1286 */ 1287 static ssize_t write_gracetime(struct file *file, char *buf, size_t size) 1288 { 1289 return nfsd4_write_time(file, buf, size, &nfsd4_grace); 1290 } 1291 1292 extern char *nfs4_recoverydir(void); 1293 1294 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size) 1295 { 1296 char *mesg = buf; 1297 char *recdir; 1298 int len, status; 1299 1300 if (size > 0) { 1301 if (nfsd_serv) 1302 return -EBUSY; 1303 if (size > PATH_MAX || buf[size-1] != '\n') 1304 return -EINVAL; 1305 buf[size-1] = 0; 1306 1307 recdir = mesg; 1308 len = qword_get(&mesg, recdir, size); 1309 if (len <= 0) 1310 return -EINVAL; 1311 1312 status = nfs4_reset_recoverydir(recdir); 1313 } 1314 1315 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 1316 nfs4_recoverydir()); 1317 } 1318 1319 /** 1320 * write_recoverydir - Set or report the pathname of the recovery directory 1321 * 1322 * Input: 1323 * buf: ignored 1324 * size: zero 1325 * 1326 * OR 1327 * 1328 * Input: 1329 * buf: C string containing the pathname 1330 * of the directory on a local file 1331 * system containing permanent NFSv4 1332 * recovery data 1333 * size: non-zero length of C string in @buf 1334 * Output: 1335 * On success: passed-in buffer filled with '\n'-terminated C string 1336 * containing the current recovery pathname setting; 1337 * return code is the size in bytes of the string 1338 * On error: return code is zero or a negative errno value 1339 */ 1340 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1341 { 1342 ssize_t rv; 1343 1344 mutex_lock(&nfsd_mutex); 1345 rv = __write_recoverydir(file, buf, size); 1346 mutex_unlock(&nfsd_mutex); 1347 return rv; 1348 } 1349 1350 #endif 1351 1352 /*----------------------------------------------------------------------------*/ 1353 /* 1354 * populating the filesystem. 1355 */ 1356 1357 static int nfsd_fill_super(struct super_block * sb, void * data, int silent) 1358 { 1359 static struct tree_descr nfsd_files[] = { 1360 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR}, 1361 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR}, 1362 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR}, 1363 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR}, 1364 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR}, 1365 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR}, 1366 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR}, 1367 [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, 1368 [NFSD_Export_features] = {"export_features", 1369 &export_features_operations, S_IRUGO}, 1370 [NFSD_FO_UnlockIP] = {"unlock_ip", 1371 &transaction_ops, S_IWUSR|S_IRUSR}, 1372 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1373 &transaction_ops, S_IWUSR|S_IRUSR}, 1374 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1375 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1376 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1377 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1378 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1379 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1380 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1381 #ifdef CONFIG_NFSD_V4 1382 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1383 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1384 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1385 #endif 1386 /* last one */ {""} 1387 }; 1388 return simple_fill_super(sb, 0x6e667364, nfsd_files); 1389 } 1390 1391 static int nfsd_get_sb(struct file_system_type *fs_type, 1392 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 1393 { 1394 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt); 1395 } 1396 1397 static struct file_system_type nfsd_fs_type = { 1398 .owner = THIS_MODULE, 1399 .name = "nfsd", 1400 .get_sb = nfsd_get_sb, 1401 .kill_sb = kill_litter_super, 1402 }; 1403 1404 #ifdef CONFIG_PROC_FS 1405 static int create_proc_exports_entry(void) 1406 { 1407 struct proc_dir_entry *entry; 1408 1409 entry = proc_mkdir("fs/nfs", NULL); 1410 if (!entry) 1411 return -ENOMEM; 1412 entry = proc_create("exports", 0, entry, &exports_operations); 1413 if (!entry) 1414 return -ENOMEM; 1415 return 0; 1416 } 1417 #else /* CONFIG_PROC_FS */ 1418 static int create_proc_exports_entry(void) 1419 { 1420 return 0; 1421 } 1422 #endif 1423 1424 static int __init init_nfsd(void) 1425 { 1426 int retval; 1427 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); 1428 1429 retval = nfs4_state_init(); /* nfs4 locking state */ 1430 if (retval) 1431 return retval; 1432 nfsd_stat_init(); /* Statistics */ 1433 retval = nfsd_reply_cache_init(); 1434 if (retval) 1435 goto out_free_stat; 1436 retval = nfsd_export_init(); 1437 if (retval) 1438 goto out_free_cache; 1439 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 1440 retval = nfsd_idmap_init(); 1441 if (retval) 1442 goto out_free_lockd; 1443 retval = create_proc_exports_entry(); 1444 if (retval) 1445 goto out_free_idmap; 1446 retval = register_filesystem(&nfsd_fs_type); 1447 if (retval) 1448 goto out_free_all; 1449 return 0; 1450 out_free_all: 1451 remove_proc_entry("fs/nfs/exports", NULL); 1452 remove_proc_entry("fs/nfs", NULL); 1453 out_free_idmap: 1454 nfsd_idmap_shutdown(); 1455 out_free_lockd: 1456 nfsd_lockd_shutdown(); 1457 nfsd_export_shutdown(); 1458 out_free_cache: 1459 nfsd_reply_cache_shutdown(); 1460 out_free_stat: 1461 nfsd_stat_shutdown(); 1462 nfsd4_free_slabs(); 1463 return retval; 1464 } 1465 1466 static void __exit exit_nfsd(void) 1467 { 1468 nfsd_export_shutdown(); 1469 nfsd_reply_cache_shutdown(); 1470 remove_proc_entry("fs/nfs/exports", NULL); 1471 remove_proc_entry("fs/nfs", NULL); 1472 nfsd_stat_shutdown(); 1473 nfsd_lockd_shutdown(); 1474 nfsd_idmap_shutdown(); 1475 nfsd4_free_slabs(); 1476 unregister_filesystem(&nfsd_fs_type); 1477 } 1478 1479 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1480 MODULE_LICENSE("GPL"); 1481 module_init(init_nfsd) 1482 module_exit(exit_nfsd) 1483