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 */ 23enum { 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 */ 57static ssize_t write_svc(struct file *file, char *buf, size_t size); 58static ssize_t write_add(struct file *file, char *buf, size_t size); 59static ssize_t write_del(struct file *file, char *buf, size_t size); 60static ssize_t write_export(struct file *file, char *buf, size_t size); 61static ssize_t write_unexport(struct file *file, char *buf, size_t size); 62static ssize_t write_getfd(struct file *file, char *buf, size_t size); 63static ssize_t write_getfs(struct file *file, char *buf, size_t size); 64static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 65static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); 66static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); 67static ssize_t write_threads(struct file *file, char *buf, size_t size); 68static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 69static ssize_t write_versions(struct file *file, char *buf, size_t size); 70static ssize_t write_ports(struct file *file, char *buf, size_t size); 71static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 72#ifdef CONFIG_NFSD_V4 73static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 74static ssize_t write_gracetime(struct file *file, char *buf, size_t size); 75static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 76#endif 77 78static 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 101static 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 122static 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 136static const struct file_operations transaction_ops = { 137 .write = nfsctl_transaction_write, 138 .read = nfsctl_transaction_read, 139 .release = simple_transaction_release, 140}; 141 142static int exports_open(struct inode *inode, struct file *file) 143{ 144 return seq_open(file, &nfs_exports_op); 145} 146 147static 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 155static 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 161static int export_features_open(struct inode *inode, struct file *file) 162{ 163 return single_open(file, export_features_show, NULL); 164} 165 166static 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 173extern int nfsd_pool_stats_open(struct inode *inode, struct file *file); 174extern int nfsd_pool_stats_release(struct inode *inode, struct file *file); 175 176static 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 */ 205static 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 */ 242static 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 */ 275static 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 */ 311static 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 */ 345static 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 */ 379static 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 */ 441static 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 */ 499static 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 */ 537static 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 error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb); 559 560 path_put(&path); 561 return error; 562} 563 564/** 565 * write_filehandle - Get a variable-length NFS file handle by path 566 * 567 * On input, the buffer contains a '\n'-terminated C string comprised of 568 * three alphanumeric words separated by whitespace. The string may 569 * contain escape sequences. 570 * 571 * Input: 572 * buf: 573 * domain: client domain name 574 * path: export pathname 575 * maxsize: numeric maximum size of 576 * @buf 577 * size: length of C string in @buf 578 * Output: 579 * On success: passed-in buffer filled with '\n'-terminated C 580 * string containing a ASCII hex text version 581 * of the NFS file handle; 582 * return code is the size in bytes of the string 583 * On error: return code is negative errno value 584 */ 585static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 586{ 587 char *dname, *path; 588 int uninitialized_var(maxsize); 589 char *mesg = buf; 590 int len; 591 struct auth_domain *dom; 592 struct knfsd_fh fh; 593 594 if (size == 0) 595 return -EINVAL; 596 597 if (buf[size-1] != '\n') 598 return -EINVAL; 599 buf[size-1] = 0; 600 601 dname = mesg; 602 len = qword_get(&mesg, dname, size); 603 if (len <= 0) 604 return -EINVAL; 605 606 path = dname+len+1; 607 len = qword_get(&mesg, path, size); 608 if (len <= 0) 609 return -EINVAL; 610 611 len = get_int(&mesg, &maxsize); 612 if (len) 613 return len; 614 615 if (maxsize < NFS_FHSIZE) 616 return -EINVAL; 617 if (maxsize > NFS3_FHSIZE) 618 maxsize = NFS3_FHSIZE; 619 620 if (qword_get(&mesg, mesg, size)>0) 621 return -EINVAL; 622 623 /* we have all the words, they are in buf.. */ 624 dom = unix_domain_find(dname); 625 if (!dom) 626 return -ENOMEM; 627 628 len = exp_rootfh(dom, path, &fh, maxsize); 629 auth_domain_put(dom); 630 if (len) 631 return len; 632 633 mesg = buf; 634 len = SIMPLE_TRANSACTION_LIMIT; 635 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); 636 mesg[-1] = '\n'; 637 return mesg - buf; 638} 639 640/** 641 * write_threads - Start NFSD, or report the current number of running threads 642 * 643 * Input: 644 * buf: ignored 645 * size: zero 646 * Output: 647 * On success: passed-in buffer filled with '\n'-terminated C 648 * string numeric value representing the number of 649 * running NFSD threads; 650 * return code is the size in bytes of the string 651 * On error: return code is zero 652 * 653 * OR 654 * 655 * Input: 656 * buf: C string containing an unsigned 657 * integer value representing the 658 * number of NFSD threads to start 659 * size: non-zero length of C string in @buf 660 * Output: 661 * On success: NFS service is started; 662 * passed-in buffer filled with '\n'-terminated C 663 * string numeric value representing the number of 664 * running NFSD threads; 665 * return code is the size in bytes of the string 666 * On error: return code is zero or a negative errno value 667 */ 668static ssize_t write_threads(struct file *file, char *buf, size_t size) 669{ 670 char *mesg = buf; 671 int rv; 672 if (size > 0) { 673 int newthreads; 674 rv = get_int(&mesg, &newthreads); 675 if (rv) 676 return rv; 677 if (newthreads < 0) 678 return -EINVAL; 679 rv = nfsd_svc(NFS_PORT, newthreads); 680 if (rv < 0) 681 return rv; 682 } else 683 rv = nfsd_nrthreads(); 684 685 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); 686} 687 688/** 689 * write_pool_threads - Set or report the current number of threads per pool 690 * 691 * Input: 692 * buf: ignored 693 * size: zero 694 * 695 * OR 696 * 697 * Input: 698 * buf: C string containing whitespace- 699 * separated unsigned integer values 700 * representing the number of NFSD 701 * threads to start in each pool 702 * size: non-zero length of C string in @buf 703 * Output: 704 * On success: passed-in buffer filled with '\n'-terminated C 705 * string containing integer values representing the 706 * number of NFSD threads in each pool; 707 * return code is the size in bytes of the string 708 * On error: return code is zero or a negative errno value 709 */ 710static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 711{ 712 /* if size > 0, look for an array of number of threads per node 713 * and apply them then write out number of threads per node as reply 714 */ 715 char *mesg = buf; 716 int i; 717 int rv; 718 int len; 719 int npools; 720 int *nthreads; 721 722 mutex_lock(&nfsd_mutex); 723 npools = nfsd_nrpools(); 724 if (npools == 0) { 725 /* 726 * NFS is shut down. The admin can start it by 727 * writing to the threads file but NOT the pool_threads 728 * file, sorry. Report zero threads. 729 */ 730 mutex_unlock(&nfsd_mutex); 731 strcpy(buf, "0\n"); 732 return strlen(buf); 733 } 734 735 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); 736 rv = -ENOMEM; 737 if (nthreads == NULL) 738 goto out_free; 739 740 if (size > 0) { 741 for (i = 0; i < npools; i++) { 742 rv = get_int(&mesg, &nthreads[i]); 743 if (rv == -ENOENT) 744 break; /* fewer numbers than pools */ 745 if (rv) 746 goto out_free; /* syntax error */ 747 rv = -EINVAL; 748 if (nthreads[i] < 0) 749 goto out_free; 750 } 751 rv = nfsd_set_nrthreads(i, nthreads); 752 if (rv) 753 goto out_free; 754 } 755 756 rv = nfsd_get_nrthreads(npools, nthreads); 757 if (rv) 758 goto out_free; 759 760 mesg = buf; 761 size = SIMPLE_TRANSACTION_LIMIT; 762 for (i = 0; i < npools && size > 0; i++) { 763 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 764 len = strlen(mesg); 765 size -= len; 766 mesg += len; 767 } 768 rv = mesg - buf; 769out_free: 770 kfree(nthreads); 771 mutex_unlock(&nfsd_mutex); 772 return rv; 773} 774 775static ssize_t __write_versions(struct file *file, char *buf, size_t size) 776{ 777 char *mesg = buf; 778 char *vers, *minorp, sign; 779 int len, num, remaining; 780 unsigned minor; 781 ssize_t tlen = 0; 782 char *sep; 783 784 if (size>0) { 785 if (nfsd_serv) 786 /* Cannot change versions without updating 787 * nfsd_serv->sv_xdrsize, and reallocing 788 * rq_argp and rq_resp 789 */ 790 return -EBUSY; 791 if (buf[size-1] != '\n') 792 return -EINVAL; 793 buf[size-1] = 0; 794 795 vers = mesg; 796 len = qword_get(&mesg, vers, size); 797 if (len <= 0) return -EINVAL; 798 do { 799 sign = *vers; 800 if (sign == '+' || sign == '-') 801 num = simple_strtol((vers+1), &minorp, 0); 802 else 803 num = simple_strtol(vers, &minorp, 0); 804 if (*minorp == '.') { 805 if (num < 4) 806 return -EINVAL; 807 minor = simple_strtoul(minorp+1, NULL, 0); 808 if (minor == 0) 809 return -EINVAL; 810 if (nfsd_minorversion(minor, sign == '-' ? 811 NFSD_CLEAR : NFSD_SET) < 0) 812 return -EINVAL; 813 goto next; 814 } 815 switch(num) { 816 case 2: 817 case 3: 818 case 4: 819 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET); 820 break; 821 default: 822 return -EINVAL; 823 } 824 next: 825 vers += len + 1; 826 } while ((len = qword_get(&mesg, vers, size)) > 0); 827 /* If all get turned off, turn them back on, as 828 * having no versions is BAD 829 */ 830 nfsd_reset_versions(); 831 } 832 833 /* Now write current state into reply buffer */ 834 len = 0; 835 sep = ""; 836 remaining = SIMPLE_TRANSACTION_LIMIT; 837 for (num=2 ; num <= 4 ; num++) 838 if (nfsd_vers(num, NFSD_AVAIL)) { 839 len = snprintf(buf, remaining, "%s%c%d", sep, 840 nfsd_vers(num, NFSD_TEST)?'+':'-', 841 num); 842 sep = " "; 843 844 if (len > remaining) 845 break; 846 remaining -= len; 847 buf += len; 848 tlen += len; 849 } 850 if (nfsd_vers(4, NFSD_AVAIL)) 851 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION; 852 minor++) { 853 len = snprintf(buf, remaining, " %c4.%u", 854 (nfsd_vers(4, NFSD_TEST) && 855 nfsd_minorversion(minor, NFSD_TEST)) ? 856 '+' : '-', 857 minor); 858 859 if (len > remaining) 860 break; 861 remaining -= len; 862 buf += len; 863 tlen += len; 864 } 865 866 len = snprintf(buf, remaining, "\n"); 867 if (len > remaining) 868 return -EINVAL; 869 return tlen + len; 870} 871 872/** 873 * write_versions - Set or report the available NFS protocol versions 874 * 875 * Input: 876 * buf: ignored 877 * size: zero 878 * Output: 879 * On success: passed-in buffer filled with '\n'-terminated C 880 * string containing positive or negative integer 881 * values representing the current status of each 882 * protocol version; 883 * return code is the size in bytes of the string 884 * On error: return code is zero or a negative errno value 885 * 886 * OR 887 * 888 * Input: 889 * buf: C string containing whitespace- 890 * separated positive or negative 891 * integer values representing NFS 892 * protocol versions to enable ("+n") 893 * or disable ("-n") 894 * size: non-zero length of C string in @buf 895 * Output: 896 * On success: status of zero or more protocol versions has 897 * been updated; passed-in buffer filled with 898 * '\n'-terminated C string containing positive 899 * or negative integer values representing the 900 * current status of each protocol version; 901 * return code is the size in bytes of the string 902 * On error: return code is zero or a negative errno value 903 */ 904static ssize_t write_versions(struct file *file, char *buf, size_t size) 905{ 906 ssize_t rv; 907 908 mutex_lock(&nfsd_mutex); 909 rv = __write_versions(file, buf, size); 910 mutex_unlock(&nfsd_mutex); 911 return rv; 912} 913 914/* 915 * Zero-length write. Return a list of NFSD's current listener 916 * transports. 917 */ 918static ssize_t __write_ports_names(char *buf) 919{ 920 if (nfsd_serv == NULL) 921 return 0; 922 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); 923} 924 925/* 926 * A single 'fd' number was written, in which case it must be for 927 * a socket of a supported family/protocol, and we use it as an 928 * nfsd listener. 929 */ 930static ssize_t __write_ports_addfd(char *buf) 931{ 932 char *mesg = buf; 933 int fd, err; 934 935 err = get_int(&mesg, &fd); 936 if (err != 0 || fd < 0) 937 return -EINVAL; 938 939 err = nfsd_create_serv(); 940 if (err != 0) 941 return err; 942 943 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT); 944 if (err < 0) { 945 svc_destroy(nfsd_serv); 946 return err; 947 } 948 949 /* Decrease the count, but don't shut down the service */ 950 nfsd_serv->sv_nrthreads--; 951 return err; 952} 953 954/* 955 * A '-' followed by the 'name' of a socket means we close the socket. 956 */ 957static ssize_t __write_ports_delfd(char *buf) 958{ 959 char *toclose; 960 int len = 0; 961 962 toclose = kstrdup(buf + 1, GFP_KERNEL); 963 if (toclose == NULL) 964 return -ENOMEM; 965 966 if (nfsd_serv != NULL) 967 len = svc_sock_names(nfsd_serv, buf, 968 SIMPLE_TRANSACTION_LIMIT, toclose); 969 kfree(toclose); 970 return len; 971} 972 973/* 974 * A transport listener is added by writing it's transport name and 975 * a port number. 976 */ 977static ssize_t __write_ports_addxprt(char *buf) 978{ 979 char transport[16]; 980 struct svc_xprt *xprt; 981 int port, err; 982 983 if (sscanf(buf, "%15s %4u", transport, &port) != 2) 984 return -EINVAL; 985 986 if (port < 1 || port > USHRT_MAX) 987 return -EINVAL; 988 989 err = nfsd_create_serv(); 990 if (err != 0) 991 return err; 992 993 err = svc_create_xprt(nfsd_serv, transport, 994 PF_INET, port, SVC_SOCK_ANONYMOUS); 995 if (err < 0) 996 goto out_err; 997 998 err = svc_create_xprt(nfsd_serv, transport, 999 PF_INET6, port, SVC_SOCK_ANONYMOUS); 1000 if (err < 0 && err != -EAFNOSUPPORT) 1001 goto out_close; 1002 1003 /* Decrease the count, but don't shut down the service */ 1004 nfsd_serv->sv_nrthreads--; 1005 return 0; 1006out_close: 1007 xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port); 1008 if (xprt != NULL) { 1009 svc_close_xprt(xprt); 1010 svc_xprt_put(xprt); 1011 } 1012out_err: 1013 svc_destroy(nfsd_serv); 1014 return err; 1015} 1016 1017/* 1018 * A transport listener is removed by writing a "-", it's transport 1019 * name, and it's port number. 1020 */ 1021static ssize_t __write_ports_delxprt(char *buf) 1022{ 1023 struct svc_xprt *xprt; 1024 char transport[16]; 1025 int port; 1026 1027 if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2) 1028 return -EINVAL; 1029 1030 if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL) 1031 return -EINVAL; 1032 1033 xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port); 1034 if (xprt == NULL) 1035 return -ENOTCONN; 1036 1037 svc_close_xprt(xprt); 1038 svc_xprt_put(xprt); 1039 return 0; 1040} 1041 1042static ssize_t __write_ports(struct file *file, char *buf, size_t size) 1043{ 1044 if (size == 0) 1045 return __write_ports_names(buf); 1046 1047 if (isdigit(buf[0])) 1048 return __write_ports_addfd(buf); 1049 1050 if (buf[0] == '-' && isdigit(buf[1])) 1051 return __write_ports_delfd(buf); 1052 1053 if (isalpha(buf[0])) 1054 return __write_ports_addxprt(buf); 1055 1056 if (buf[0] == '-' && isalpha(buf[1])) 1057 return __write_ports_delxprt(buf); 1058 1059 return -EINVAL; 1060} 1061 1062/** 1063 * write_ports - Pass a socket file descriptor or transport name to listen on 1064 * 1065 * Input: 1066 * buf: ignored 1067 * size: zero 1068 * Output: 1069 * On success: passed-in buffer filled with a '\n'-terminated C 1070 * string containing a whitespace-separated list of 1071 * named NFSD listeners; 1072 * return code is the size in bytes of the string 1073 * On error: return code is zero or a negative errno value 1074 * 1075 * OR 1076 * 1077 * Input: 1078 * buf: C string containing an unsigned 1079 * integer value representing a bound 1080 * but unconnected socket that is to be 1081 * used as an NFSD listener; listen(3) 1082 * must be called for a SOCK_STREAM 1083 * socket, otherwise it is ignored 1084 * size: non-zero length of C string in @buf 1085 * Output: 1086 * On success: NFS service is started; 1087 * passed-in buffer filled with a '\n'-terminated C 1088 * string containing a unique alphanumeric name of 1089 * the listener; 1090 * return code is the size in bytes of the string 1091 * On error: return code is a negative errno value 1092 * 1093 * OR 1094 * 1095 * Input: 1096 * buf: C string containing a "-" followed 1097 * by an integer value representing a 1098 * previously passed in socket file 1099 * descriptor 1100 * size: non-zero length of C string in @buf 1101 * Output: 1102 * On success: NFS service no longer listens on that socket; 1103 * passed-in buffer filled with a '\n'-terminated C 1104 * string containing a unique name of the listener; 1105 * return code is the size in bytes of the string 1106 * On error: return code is a negative errno value 1107 * 1108 * OR 1109 * 1110 * Input: 1111 * buf: C string containing a transport 1112 * name and an unsigned integer value 1113 * representing the port to listen on, 1114 * separated by whitespace 1115 * size: non-zero length of C string in @buf 1116 * Output: 1117 * On success: returns zero; NFS service is started 1118 * On error: return code is a negative errno value 1119 * 1120 * OR 1121 * 1122 * Input: 1123 * buf: C string containing a "-" followed 1124 * by a transport name and an unsigned 1125 * integer value representing the port 1126 * to listen on, separated by whitespace 1127 * size: non-zero length of C string in @buf 1128 * Output: 1129 * On success: returns zero; NFS service no longer listens 1130 * on that transport 1131 * On error: return code is a negative errno value 1132 */ 1133static ssize_t write_ports(struct file *file, char *buf, size_t size) 1134{ 1135 ssize_t rv; 1136 1137 mutex_lock(&nfsd_mutex); 1138 rv = __write_ports(file, buf, size); 1139 mutex_unlock(&nfsd_mutex); 1140 return rv; 1141} 1142 1143 1144int nfsd_max_blksize; 1145 1146/** 1147 * write_maxblksize - Set or report the current NFS blksize 1148 * 1149 * Input: 1150 * buf: ignored 1151 * size: zero 1152 * 1153 * OR 1154 * 1155 * Input: 1156 * buf: C string containing an unsigned 1157 * integer value representing the new 1158 * NFS blksize 1159 * size: non-zero length of C string in @buf 1160 * Output: 1161 * On success: passed-in buffer filled with '\n'-terminated C string 1162 * containing numeric value of the current NFS blksize 1163 * setting; 1164 * return code is the size in bytes of the string 1165 * On error: return code is zero or a negative errno value 1166 */ 1167static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 1168{ 1169 char *mesg = buf; 1170 if (size > 0) { 1171 int bsize; 1172 int rv = get_int(&mesg, &bsize); 1173 if (rv) 1174 return rv; 1175 /* force bsize into allowed range and 1176 * required alignment. 1177 */ 1178 if (bsize < 1024) 1179 bsize = 1024; 1180 if (bsize > NFSSVC_MAXBLKSIZE) 1181 bsize = NFSSVC_MAXBLKSIZE; 1182 bsize &= ~(1024-1); 1183 mutex_lock(&nfsd_mutex); 1184 if (nfsd_serv) { 1185 mutex_unlock(&nfsd_mutex); 1186 return -EBUSY; 1187 } 1188 nfsd_max_blksize = bsize; 1189 mutex_unlock(&nfsd_mutex); 1190 } 1191 1192 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 1193 nfsd_max_blksize); 1194} 1195 1196#ifdef CONFIG_NFSD_V4 1197static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time) 1198{ 1199 char *mesg = buf; 1200 int rv, i; 1201 1202 if (size > 0) { 1203 if (nfsd_serv) 1204 return -EBUSY; 1205 rv = get_int(&mesg, &i); 1206 if (rv) 1207 return rv; 1208 /* 1209 * Some sanity checking. We don't have a reason for 1210 * these particular numbers, but problems with the 1211 * extremes are: 1212 * - Too short: the briefest network outage may 1213 * cause clients to lose all their locks. Also, 1214 * the frequent polling may be wasteful. 1215 * - Too long: do you really want reboot recovery 1216 * to take more than an hour? Or to make other 1217 * clients wait an hour before being able to 1218 * revoke a dead client's locks? 1219 */ 1220 if (i < 10 || i > 3600) 1221 return -EINVAL; 1222 *time = i; 1223 } 1224 1225 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time); 1226} 1227 1228static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time) 1229{ 1230 ssize_t rv; 1231 1232 mutex_lock(&nfsd_mutex); 1233 rv = __nfsd4_write_time(file, buf, size, time); 1234 mutex_unlock(&nfsd_mutex); 1235 return rv; 1236} 1237 1238/** 1239 * write_leasetime - Set or report the current NFSv4 lease time 1240 * 1241 * Input: 1242 * buf: ignored 1243 * size: zero 1244 * 1245 * OR 1246 * 1247 * Input: 1248 * buf: C string containing an unsigned 1249 * integer value representing the new 1250 * NFSv4 lease expiry time 1251 * size: non-zero length of C string in @buf 1252 * Output: 1253 * On success: passed-in buffer filled with '\n'-terminated C 1254 * string containing unsigned integer value of the 1255 * current lease expiry time; 1256 * return code is the size in bytes of the string 1257 * On error: return code is zero or a negative errno value 1258 */ 1259static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 1260{ 1261 return nfsd4_write_time(file, buf, size, &nfsd4_lease); 1262} 1263 1264/** 1265 * write_gracetime - Set or report current NFSv4 grace period time 1266 * 1267 * As above, but sets the time of the NFSv4 grace period. 1268 * 1269 * Note this should never be set to less than the *previous* 1270 * lease-period time, but we don't try to enforce this. (In the common 1271 * case (a new boot), we don't know what the previous lease time was 1272 * anyway.) 1273 */ 1274static ssize_t write_gracetime(struct file *file, char *buf, size_t size) 1275{ 1276 return nfsd4_write_time(file, buf, size, &nfsd4_grace); 1277} 1278 1279extern char *nfs4_recoverydir(void); 1280 1281static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size) 1282{ 1283 char *mesg = buf; 1284 char *recdir; 1285 int len, status; 1286 1287 if (size > 0) { 1288 if (nfsd_serv) 1289 return -EBUSY; 1290 if (size > PATH_MAX || buf[size-1] != '\n') 1291 return -EINVAL; 1292 buf[size-1] = 0; 1293 1294 recdir = mesg; 1295 len = qword_get(&mesg, recdir, size); 1296 if (len <= 0) 1297 return -EINVAL; 1298 1299 status = nfs4_reset_recoverydir(recdir); 1300 if (status) 1301 return status; 1302 } 1303 1304 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 1305 nfs4_recoverydir()); 1306} 1307 1308/** 1309 * write_recoverydir - Set or report the pathname of the recovery directory 1310 * 1311 * Input: 1312 * buf: ignored 1313 * size: zero 1314 * 1315 * OR 1316 * 1317 * Input: 1318 * buf: C string containing the pathname 1319 * of the directory on a local file 1320 * system containing permanent NFSv4 1321 * recovery data 1322 * size: non-zero length of C string in @buf 1323 * Output: 1324 * On success: passed-in buffer filled with '\n'-terminated C string 1325 * containing the current recovery pathname setting; 1326 * return code is the size in bytes of the string 1327 * On error: return code is zero or a negative errno value 1328 */ 1329static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1330{ 1331 ssize_t rv; 1332 1333 mutex_lock(&nfsd_mutex); 1334 rv = __write_recoverydir(file, buf, size); 1335 mutex_unlock(&nfsd_mutex); 1336 return rv; 1337} 1338 1339#endif 1340 1341/*----------------------------------------------------------------------------*/ 1342/* 1343 * populating the filesystem. 1344 */ 1345 1346static int nfsd_fill_super(struct super_block * sb, void * data, int silent) 1347{ 1348 static struct tree_descr nfsd_files[] = { 1349 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR}, 1350 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR}, 1351 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR}, 1352 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR}, 1353 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR}, 1354 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR}, 1355 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR}, 1356 [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, 1357 [NFSD_Export_features] = {"export_features", 1358 &export_features_operations, S_IRUGO}, 1359 [NFSD_FO_UnlockIP] = {"unlock_ip", 1360 &transaction_ops, S_IWUSR|S_IRUSR}, 1361 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1362 &transaction_ops, S_IWUSR|S_IRUSR}, 1363 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1364 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1365 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1366 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1367 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1368 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1369 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1370#ifdef CONFIG_NFSD_V4 1371 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1372 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1373 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1374#endif 1375 /* last one */ {""} 1376 }; 1377 return simple_fill_super(sb, 0x6e667364, nfsd_files); 1378} 1379 1380static int nfsd_get_sb(struct file_system_type *fs_type, 1381 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 1382{ 1383 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt); 1384} 1385 1386static struct file_system_type nfsd_fs_type = { 1387 .owner = THIS_MODULE, 1388 .name = "nfsd", 1389 .get_sb = nfsd_get_sb, 1390 .kill_sb = kill_litter_super, 1391}; 1392 1393#ifdef CONFIG_PROC_FS 1394static int create_proc_exports_entry(void) 1395{ 1396 struct proc_dir_entry *entry; 1397 1398 entry = proc_mkdir("fs/nfs", NULL); 1399 if (!entry) 1400 return -ENOMEM; 1401 entry = proc_create("exports", 0, entry, &exports_operations); 1402 if (!entry) 1403 return -ENOMEM; 1404 return 0; 1405} 1406#else /* CONFIG_PROC_FS */ 1407static int create_proc_exports_entry(void) 1408{ 1409 return 0; 1410} 1411#endif 1412 1413static int __init init_nfsd(void) 1414{ 1415 int retval; 1416 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); 1417 1418 retval = nfs4_state_init(); /* nfs4 locking state */ 1419 if (retval) 1420 return retval; 1421 nfsd_stat_init(); /* Statistics */ 1422 retval = nfsd_reply_cache_init(); 1423 if (retval) 1424 goto out_free_stat; 1425 retval = nfsd_export_init(); 1426 if (retval) 1427 goto out_free_cache; 1428 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 1429 retval = nfsd_idmap_init(); 1430 if (retval) 1431 goto out_free_lockd; 1432 retval = create_proc_exports_entry(); 1433 if (retval) 1434 goto out_free_idmap; 1435 retval = register_filesystem(&nfsd_fs_type); 1436 if (retval) 1437 goto out_free_all; 1438 return 0; 1439out_free_all: 1440 remove_proc_entry("fs/nfs/exports", NULL); 1441 remove_proc_entry("fs/nfs", NULL); 1442out_free_idmap: 1443 nfsd_idmap_shutdown(); 1444out_free_lockd: 1445 nfsd_lockd_shutdown(); 1446 nfsd_export_shutdown(); 1447out_free_cache: 1448 nfsd_reply_cache_shutdown(); 1449out_free_stat: 1450 nfsd_stat_shutdown(); 1451 nfsd4_free_slabs(); 1452 return retval; 1453} 1454 1455static void __exit exit_nfsd(void) 1456{ 1457 nfsd_export_shutdown(); 1458 nfsd_reply_cache_shutdown(); 1459 remove_proc_entry("fs/nfs/exports", NULL); 1460 remove_proc_entry("fs/nfs", NULL); 1461 nfsd_stat_shutdown(); 1462 nfsd_lockd_shutdown(); 1463 nfsd_idmap_shutdown(); 1464 nfsd4_free_slabs(); 1465 unregister_filesystem(&nfsd_fs_type); 1466} 1467 1468MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1469MODULE_LICENSE("GPL"); 1470module_init(init_nfsd) 1471module_exit(exit_nfsd) 1472