1 /* 2 * Syscall interface to knfsd. 3 * 4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 5 */ 6 7 #include <linux/namei.h> 8 #include <linux/ctype.h> 9 10 #include <linux/nfsd_idmap.h> 11 #include <linux/sunrpc/svcsock.h> 12 #include <linux/nfsd/syscall.h> 13 #include <linux/lockd/lockd.h> 14 #include <linux/sunrpc/clnt.h> 15 16 #include "nfsd.h" 17 #include "cache.h" 18 19 /* 20 * We have a single directory with 9 nodes in it. 21 */ 22 enum { 23 NFSD_Root = 1, 24 NFSD_Svc, 25 NFSD_Add, 26 NFSD_Del, 27 NFSD_Export, 28 NFSD_Unexport, 29 NFSD_Getfd, 30 NFSD_Getfs, 31 NFSD_List, 32 NFSD_Export_features, 33 NFSD_Fh, 34 NFSD_FO_UnlockIP, 35 NFSD_FO_UnlockFS, 36 NFSD_Threads, 37 NFSD_Pool_Threads, 38 NFSD_Pool_Stats, 39 NFSD_Versions, 40 NFSD_Ports, 41 NFSD_MaxBlkSize, 42 /* 43 * The below MUST come last. Otherwise we leave a hole in nfsd_files[] 44 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops 45 */ 46 #ifdef CONFIG_NFSD_V4 47 NFSD_Leasetime, 48 NFSD_RecoveryDir, 49 #endif 50 }; 51 52 /* 53 * write() for these nodes. 54 */ 55 static ssize_t write_svc(struct file *file, char *buf, size_t size); 56 static ssize_t write_add(struct file *file, char *buf, size_t size); 57 static ssize_t write_del(struct file *file, char *buf, size_t size); 58 static ssize_t write_export(struct file *file, char *buf, size_t size); 59 static ssize_t write_unexport(struct file *file, char *buf, size_t size); 60 static ssize_t write_getfd(struct file *file, char *buf, size_t size); 61 static ssize_t write_getfs(struct file *file, char *buf, size_t size); 62 static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 63 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); 64 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); 65 static ssize_t write_threads(struct file *file, char *buf, size_t size); 66 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 67 static ssize_t write_versions(struct file *file, char *buf, size_t size); 68 static ssize_t write_ports(struct file *file, char *buf, size_t size); 69 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 70 #ifdef CONFIG_NFSD_V4 71 static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 72 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 73 #endif 74 75 static ssize_t (*write_op[])(struct file *, char *, size_t) = { 76 [NFSD_Svc] = write_svc, 77 [NFSD_Add] = write_add, 78 [NFSD_Del] = write_del, 79 [NFSD_Export] = write_export, 80 [NFSD_Unexport] = write_unexport, 81 [NFSD_Getfd] = write_getfd, 82 [NFSD_Getfs] = write_getfs, 83 [NFSD_Fh] = write_filehandle, 84 [NFSD_FO_UnlockIP] = write_unlock_ip, 85 [NFSD_FO_UnlockFS] = write_unlock_fs, 86 [NFSD_Threads] = write_threads, 87 [NFSD_Pool_Threads] = write_pool_threads, 88 [NFSD_Versions] = write_versions, 89 [NFSD_Ports] = write_ports, 90 [NFSD_MaxBlkSize] = write_maxblksize, 91 #ifdef CONFIG_NFSD_V4 92 [NFSD_Leasetime] = write_leasetime, 93 [NFSD_RecoveryDir] = write_recoverydir, 94 #endif 95 }; 96 97 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 98 { 99 ino_t ino = file->f_path.dentry->d_inode->i_ino; 100 char *data; 101 ssize_t rv; 102 103 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 104 return -EINVAL; 105 106 data = simple_transaction_get(file, buf, size); 107 if (IS_ERR(data)) 108 return PTR_ERR(data); 109 110 rv = write_op[ino](file, data, size); 111 if (rv >= 0) { 112 simple_transaction_set(file, rv); 113 rv = size; 114 } 115 return rv; 116 } 117 118 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) 119 { 120 if (! file->private_data) { 121 /* An attempt to read a transaction file without writing 122 * causes a 0-byte write so that the file can return 123 * state information 124 */ 125 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); 126 if (rv < 0) 127 return rv; 128 } 129 return simple_transaction_read(file, buf, size, pos); 130 } 131 132 static const struct file_operations transaction_ops = { 133 .write = nfsctl_transaction_write, 134 .read = nfsctl_transaction_read, 135 .release = simple_transaction_release, 136 }; 137 138 static int exports_open(struct inode *inode, struct file *file) 139 { 140 return seq_open(file, &nfs_exports_op); 141 } 142 143 static const struct file_operations exports_operations = { 144 .open = exports_open, 145 .read = seq_read, 146 .llseek = seq_lseek, 147 .release = seq_release, 148 .owner = THIS_MODULE, 149 }; 150 151 static int export_features_show(struct seq_file *m, void *v) 152 { 153 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS); 154 return 0; 155 } 156 157 static int export_features_open(struct inode *inode, struct file *file) 158 { 159 return single_open(file, export_features_show, NULL); 160 } 161 162 static struct file_operations export_features_operations = { 163 .open = export_features_open, 164 .read = seq_read, 165 .llseek = seq_lseek, 166 .release = single_release, 167 }; 168 169 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file); 170 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file); 171 172 static const struct file_operations pool_stats_operations = { 173 .open = nfsd_pool_stats_open, 174 .read = seq_read, 175 .llseek = seq_lseek, 176 .release = nfsd_pool_stats_release, 177 .owner = THIS_MODULE, 178 }; 179 180 /*----------------------------------------------------------------------------*/ 181 /* 182 * payload - write methods 183 */ 184 185 /** 186 * write_svc - Start kernel's NFSD server 187 * 188 * Deprecated. /proc/fs/nfsd/threads is preferred. 189 * Function remains to support old versions of nfs-utils. 190 * 191 * Input: 192 * buf: struct nfsctl_svc 193 * svc_port: port number of this 194 * server's listener 195 * svc_nthreads: number of threads to start 196 * size: size in bytes of passed in nfsctl_svc 197 * Output: 198 * On success: returns zero 199 * On error: return code is negative errno value 200 */ 201 static ssize_t write_svc(struct file *file, char *buf, size_t size) 202 { 203 struct nfsctl_svc *data; 204 int err; 205 if (size < sizeof(*data)) 206 return -EINVAL; 207 data = (struct nfsctl_svc*) buf; 208 err = nfsd_svc(data->svc_port, data->svc_nthreads); 209 if (err < 0) 210 return err; 211 return 0; 212 } 213 214 /** 215 * write_add - Add or modify client entry in auth unix cache 216 * 217 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred. 218 * Function remains to support old versions of nfs-utils. 219 * 220 * Input: 221 * buf: struct nfsctl_client 222 * cl_ident: '\0'-terminated C string 223 * containing domain name 224 * of client 225 * cl_naddr: no. of items in cl_addrlist 226 * cl_addrlist: array of client addresses 227 * cl_fhkeytype: ignored 228 * cl_fhkeylen: ignored 229 * cl_fhkey: ignored 230 * size: size in bytes of passed in nfsctl_client 231 * Output: 232 * On success: returns zero 233 * On error: return code is negative errno value 234 * 235 * Note: Only AF_INET client addresses are passed in, since 236 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses. 237 */ 238 static ssize_t write_add(struct file *file, char *buf, size_t size) 239 { 240 struct nfsctl_client *data; 241 if (size < sizeof(*data)) 242 return -EINVAL; 243 data = (struct nfsctl_client *)buf; 244 return exp_addclient(data); 245 } 246 247 /** 248 * write_del - Remove client from auth unix cache 249 * 250 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred. 251 * Function remains to support old versions of nfs-utils. 252 * 253 * Input: 254 * buf: struct nfsctl_client 255 * cl_ident: '\0'-terminated C string 256 * containing domain name 257 * of client 258 * cl_naddr: ignored 259 * cl_addrlist: ignored 260 * cl_fhkeytype: ignored 261 * cl_fhkeylen: ignored 262 * cl_fhkey: ignored 263 * size: size in bytes of passed in nfsctl_client 264 * Output: 265 * On success: returns zero 266 * On error: return code is negative errno value 267 * 268 * Note: Only AF_INET client addresses are passed in, since 269 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses. 270 */ 271 static ssize_t write_del(struct file *file, char *buf, size_t size) 272 { 273 struct nfsctl_client *data; 274 if (size < sizeof(*data)) 275 return -EINVAL; 276 data = (struct nfsctl_client *)buf; 277 return exp_delclient(data); 278 } 279 280 /** 281 * write_export - Export part or all of a local file system 282 * 283 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred. 284 * Function remains to support old versions of nfs-utils. 285 * 286 * Input: 287 * buf: struct nfsctl_export 288 * ex_client: '\0'-terminated C string 289 * containing domain name 290 * of client allowed to access 291 * this export 292 * ex_path: '\0'-terminated C string 293 * containing pathname of 294 * directory in local file system 295 * ex_dev: fsid to use for this export 296 * ex_ino: ignored 297 * ex_flags: export flags for this export 298 * ex_anon_uid: UID to use for anonymous 299 * requests 300 * ex_anon_gid: GID to use for anonymous 301 * requests 302 * size: size in bytes of passed in nfsctl_export 303 * Output: 304 * On success: returns zero 305 * On error: return code is negative errno value 306 */ 307 static ssize_t write_export(struct file *file, char *buf, size_t size) 308 { 309 struct nfsctl_export *data; 310 if (size < sizeof(*data)) 311 return -EINVAL; 312 data = (struct nfsctl_export*)buf; 313 return exp_export(data); 314 } 315 316 /** 317 * write_unexport - Unexport a previously exported file system 318 * 319 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred. 320 * Function remains to support old versions of nfs-utils. 321 * 322 * Input: 323 * buf: struct nfsctl_export 324 * ex_client: '\0'-terminated C string 325 * containing domain name 326 * of client no longer allowed 327 * to access this export 328 * ex_path: '\0'-terminated C string 329 * containing pathname of 330 * directory in local file system 331 * ex_dev: ignored 332 * ex_ino: ignored 333 * ex_flags: ignored 334 * ex_anon_uid: ignored 335 * ex_anon_gid: ignored 336 * size: size in bytes of passed in nfsctl_export 337 * Output: 338 * On success: returns zero 339 * On error: return code is negative errno value 340 */ 341 static ssize_t write_unexport(struct file *file, char *buf, size_t size) 342 { 343 struct nfsctl_export *data; 344 345 if (size < sizeof(*data)) 346 return -EINVAL; 347 data = (struct nfsctl_export*)buf; 348 return exp_unexport(data); 349 } 350 351 /** 352 * write_getfs - Get a variable-length NFS file handle by path 353 * 354 * Deprecated. /proc/fs/nfsd/filehandle is preferred. 355 * Function remains to support old versions of nfs-utils. 356 * 357 * Input: 358 * buf: struct nfsctl_fsparm 359 * gd_addr: socket address of client 360 * gd_path: '\0'-terminated C string 361 * containing pathname of 362 * directory in local file system 363 * gd_maxlen: maximum size of returned file 364 * handle 365 * size: size in bytes of passed in nfsctl_fsparm 366 * Output: 367 * On success: passed-in buffer filled with a knfsd_fh structure 368 * (a variable-length raw NFS file handle); 369 * return code is the size in bytes of the file handle 370 * On error: return code is negative errno value 371 * 372 * Note: Only AF_INET client addresses are passed in, since gd_addr 373 * is the same size as a struct sockaddr_in. 374 */ 375 static ssize_t write_getfs(struct file *file, char *buf, size_t size) 376 { 377 struct nfsctl_fsparm *data; 378 struct sockaddr_in *sin; 379 struct auth_domain *clp; 380 int err = 0; 381 struct knfsd_fh *res; 382 struct in6_addr in6; 383 384 if (size < sizeof(*data)) 385 return -EINVAL; 386 data = (struct nfsctl_fsparm*)buf; 387 err = -EPROTONOSUPPORT; 388 if (data->gd_addr.sa_family != AF_INET) 389 goto out; 390 sin = (struct sockaddr_in *)&data->gd_addr; 391 if (data->gd_maxlen > NFS3_FHSIZE) 392 data->gd_maxlen = NFS3_FHSIZE; 393 394 res = (struct knfsd_fh*)buf; 395 396 exp_readlock(); 397 398 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6); 399 400 clp = auth_unix_lookup(&in6); 401 if (!clp) 402 err = -EPERM; 403 else { 404 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen); 405 auth_domain_put(clp); 406 } 407 exp_readunlock(); 408 if (err == 0) 409 err = res->fh_size + offsetof(struct knfsd_fh, fh_base); 410 out: 411 return err; 412 } 413 414 /** 415 * write_getfd - Get a fixed-length NFS file handle by path (used by mountd) 416 * 417 * Deprecated. /proc/fs/nfsd/filehandle is preferred. 418 * Function remains to support old versions of nfs-utils. 419 * 420 * Input: 421 * buf: struct nfsctl_fdparm 422 * gd_addr: socket address of client 423 * gd_path: '\0'-terminated C string 424 * containing pathname of 425 * directory in local file system 426 * gd_version: fdparm structure version 427 * size: size in bytes of passed in nfsctl_fdparm 428 * Output: 429 * On success: passed-in buffer filled with nfsctl_res 430 * (a fixed-length raw NFS file handle); 431 * return code is the size in bytes of the file handle 432 * On error: return code is negative errno value 433 * 434 * Note: Only AF_INET client addresses are passed in, since gd_addr 435 * is the same size as a struct sockaddr_in. 436 */ 437 static ssize_t write_getfd(struct file *file, char *buf, size_t size) 438 { 439 struct nfsctl_fdparm *data; 440 struct sockaddr_in *sin; 441 struct auth_domain *clp; 442 int err = 0; 443 struct knfsd_fh fh; 444 char *res; 445 struct in6_addr in6; 446 447 if (size < sizeof(*data)) 448 return -EINVAL; 449 data = (struct nfsctl_fdparm*)buf; 450 err = -EPROTONOSUPPORT; 451 if (data->gd_addr.sa_family != AF_INET) 452 goto out; 453 err = -EINVAL; 454 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS) 455 goto out; 456 457 res = buf; 458 sin = (struct sockaddr_in *)&data->gd_addr; 459 exp_readlock(); 460 461 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6); 462 463 clp = auth_unix_lookup(&in6); 464 if (!clp) 465 err = -EPERM; 466 else { 467 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE); 468 auth_domain_put(clp); 469 } 470 exp_readunlock(); 471 472 if (err == 0) { 473 memset(res,0, NFS_FHSIZE); 474 memcpy(res, &fh.fh_base, fh.fh_size); 475 err = NFS_FHSIZE; 476 } 477 out: 478 return err; 479 } 480 481 /** 482 * write_unlock_ip - Release all locks used by a client 483 * 484 * Experimental. 485 * 486 * Input: 487 * buf: '\n'-terminated C string containing a 488 * presentation format IP address 489 * size: length of C string in @buf 490 * Output: 491 * On success: returns zero if all specified locks were released; 492 * returns one if one or more locks were not released 493 * On error: return code is negative errno value 494 */ 495 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) 496 { 497 struct sockaddr_storage address; 498 struct sockaddr *sap = (struct sockaddr *)&address; 499 size_t salen = sizeof(address); 500 char *fo_path; 501 502 /* sanity check */ 503 if (size == 0) 504 return -EINVAL; 505 506 if (buf[size-1] != '\n') 507 return -EINVAL; 508 509 fo_path = buf; 510 if (qword_get(&buf, fo_path, size) < 0) 511 return -EINVAL; 512 513 if (rpc_pton(fo_path, size, sap, salen) == 0) 514 return -EINVAL; 515 516 return nlmsvc_unlock_all_by_ip(sap); 517 } 518 519 /** 520 * write_unlock_fs - Release all locks on a local file system 521 * 522 * Experimental. 523 * 524 * Input: 525 * buf: '\n'-terminated C string containing the 526 * absolute pathname of a local file system 527 * size: length of C string in @buf 528 * Output: 529 * On success: returns zero if all specified locks were released; 530 * returns one if one or more locks were not released 531 * On error: return code is negative errno value 532 */ 533 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size) 534 { 535 struct path path; 536 char *fo_path; 537 int error; 538 539 /* sanity check */ 540 if (size == 0) 541 return -EINVAL; 542 543 if (buf[size-1] != '\n') 544 return -EINVAL; 545 546 fo_path = buf; 547 if (qword_get(&buf, fo_path, size) < 0) 548 return -EINVAL; 549 550 error = kern_path(fo_path, 0, &path); 551 if (error) 552 return error; 553 554 /* 555 * XXX: Needs better sanity checking. Otherwise we could end up 556 * releasing locks on the wrong file system. 557 * 558 * For example: 559 * 1. Does the path refer to a directory? 560 * 2. Is that directory a mount point, or 561 * 3. Is that directory the root of an exported file system? 562 */ 563 error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb); 564 565 path_put(&path); 566 return error; 567 } 568 569 /** 570 * write_filehandle - Get a variable-length NFS file handle by path 571 * 572 * On input, the buffer contains a '\n'-terminated C string comprised of 573 * three alphanumeric words separated by whitespace. The string may 574 * contain escape sequences. 575 * 576 * Input: 577 * buf: 578 * domain: client domain name 579 * path: export pathname 580 * maxsize: numeric maximum size of 581 * @buf 582 * size: length of C string in @buf 583 * Output: 584 * On success: passed-in buffer filled with '\n'-terminated C 585 * string containing a ASCII hex text version 586 * of the NFS file handle; 587 * return code is the size in bytes of the string 588 * On error: return code is negative errno value 589 */ 590 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 591 { 592 char *dname, *path; 593 int uninitialized_var(maxsize); 594 char *mesg = buf; 595 int len; 596 struct auth_domain *dom; 597 struct knfsd_fh fh; 598 599 if (size == 0) 600 return -EINVAL; 601 602 if (buf[size-1] != '\n') 603 return -EINVAL; 604 buf[size-1] = 0; 605 606 dname = mesg; 607 len = qword_get(&mesg, dname, size); 608 if (len <= 0) 609 return -EINVAL; 610 611 path = dname+len+1; 612 len = qword_get(&mesg, path, size); 613 if (len <= 0) 614 return -EINVAL; 615 616 len = get_int(&mesg, &maxsize); 617 if (len) 618 return len; 619 620 if (maxsize < NFS_FHSIZE) 621 return -EINVAL; 622 if (maxsize > NFS3_FHSIZE) 623 maxsize = NFS3_FHSIZE; 624 625 if (qword_get(&mesg, mesg, size)>0) 626 return -EINVAL; 627 628 /* we have all the words, they are in buf.. */ 629 dom = unix_domain_find(dname); 630 if (!dom) 631 return -ENOMEM; 632 633 len = exp_rootfh(dom, path, &fh, maxsize); 634 auth_domain_put(dom); 635 if (len) 636 return len; 637 638 mesg = buf; 639 len = SIMPLE_TRANSACTION_LIMIT; 640 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); 641 mesg[-1] = '\n'; 642 return mesg - buf; 643 } 644 645 /** 646 * write_threads - Start NFSD, or report the current number of running threads 647 * 648 * Input: 649 * buf: ignored 650 * size: zero 651 * Output: 652 * On success: passed-in buffer filled with '\n'-terminated C 653 * string numeric value representing the number of 654 * running NFSD threads; 655 * return code is the size in bytes of the string 656 * On error: return code is zero 657 * 658 * OR 659 * 660 * Input: 661 * buf: C string containing an unsigned 662 * integer value representing the 663 * number of NFSD threads to start 664 * size: non-zero length of C string in @buf 665 * Output: 666 * On success: NFS service is started; 667 * passed-in buffer filled with '\n'-terminated C 668 * string numeric value representing the number of 669 * running NFSD threads; 670 * return code is the size in bytes of the string 671 * On error: return code is zero or a negative errno value 672 */ 673 static ssize_t write_threads(struct file *file, char *buf, size_t size) 674 { 675 char *mesg = buf; 676 int rv; 677 if (size > 0) { 678 int newthreads; 679 rv = get_int(&mesg, &newthreads); 680 if (rv) 681 return rv; 682 if (newthreads < 0) 683 return -EINVAL; 684 rv = nfsd_svc(NFS_PORT, newthreads); 685 if (rv < 0) 686 return rv; 687 } else 688 rv = nfsd_nrthreads(); 689 690 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); 691 } 692 693 /** 694 * write_pool_threads - Set or report the current number of threads per pool 695 * 696 * Input: 697 * buf: ignored 698 * size: zero 699 * 700 * OR 701 * 702 * Input: 703 * buf: C string containing whitespace- 704 * separated unsigned integer values 705 * representing the number of NFSD 706 * threads to start in each pool 707 * size: non-zero length of C string in @buf 708 * Output: 709 * On success: passed-in buffer filled with '\n'-terminated C 710 * string containing integer values representing the 711 * number of NFSD threads in each pool; 712 * return code is the size in bytes of the string 713 * On error: return code is zero or a negative errno value 714 */ 715 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 716 { 717 /* if size > 0, look for an array of number of threads per node 718 * and apply them then write out number of threads per node as reply 719 */ 720 char *mesg = buf; 721 int i; 722 int rv; 723 int len; 724 int npools; 725 int *nthreads; 726 727 mutex_lock(&nfsd_mutex); 728 npools = nfsd_nrpools(); 729 if (npools == 0) { 730 /* 731 * NFS is shut down. The admin can start it by 732 * writing to the threads file but NOT the pool_threads 733 * file, sorry. Report zero threads. 734 */ 735 mutex_unlock(&nfsd_mutex); 736 strcpy(buf, "0\n"); 737 return strlen(buf); 738 } 739 740 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); 741 rv = -ENOMEM; 742 if (nthreads == NULL) 743 goto out_free; 744 745 if (size > 0) { 746 for (i = 0; i < npools; i++) { 747 rv = get_int(&mesg, &nthreads[i]); 748 if (rv == -ENOENT) 749 break; /* fewer numbers than pools */ 750 if (rv) 751 goto out_free; /* syntax error */ 752 rv = -EINVAL; 753 if (nthreads[i] < 0) 754 goto out_free; 755 } 756 rv = nfsd_set_nrthreads(i, nthreads); 757 if (rv) 758 goto out_free; 759 } 760 761 rv = nfsd_get_nrthreads(npools, nthreads); 762 if (rv) 763 goto out_free; 764 765 mesg = buf; 766 size = SIMPLE_TRANSACTION_LIMIT; 767 for (i = 0; i < npools && size > 0; i++) { 768 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 769 len = strlen(mesg); 770 size -= len; 771 mesg += len; 772 } 773 rv = mesg - buf; 774 out_free: 775 kfree(nthreads); 776 mutex_unlock(&nfsd_mutex); 777 return rv; 778 } 779 780 static ssize_t __write_versions(struct file *file, char *buf, size_t size) 781 { 782 char *mesg = buf; 783 char *vers, *minorp, sign; 784 int len, num, remaining; 785 unsigned minor; 786 ssize_t tlen = 0; 787 char *sep; 788 789 if (size>0) { 790 if (nfsd_serv) 791 /* Cannot change versions without updating 792 * nfsd_serv->sv_xdrsize, and reallocing 793 * rq_argp and rq_resp 794 */ 795 return -EBUSY; 796 if (buf[size-1] != '\n') 797 return -EINVAL; 798 buf[size-1] = 0; 799 800 vers = mesg; 801 len = qword_get(&mesg, vers, size); 802 if (len <= 0) return -EINVAL; 803 do { 804 sign = *vers; 805 if (sign == '+' || sign == '-') 806 num = simple_strtol((vers+1), &minorp, 0); 807 else 808 num = simple_strtol(vers, &minorp, 0); 809 if (*minorp == '.') { 810 if (num < 4) 811 return -EINVAL; 812 minor = simple_strtoul(minorp+1, NULL, 0); 813 if (minor == 0) 814 return -EINVAL; 815 if (nfsd_minorversion(minor, sign == '-' ? 816 NFSD_CLEAR : NFSD_SET) < 0) 817 return -EINVAL; 818 goto next; 819 } 820 switch(num) { 821 case 2: 822 case 3: 823 case 4: 824 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET); 825 break; 826 default: 827 return -EINVAL; 828 } 829 next: 830 vers += len + 1; 831 } while ((len = qword_get(&mesg, vers, size)) > 0); 832 /* If all get turned off, turn them back on, as 833 * having no versions is BAD 834 */ 835 nfsd_reset_versions(); 836 } 837 838 /* Now write current state into reply buffer */ 839 len = 0; 840 sep = ""; 841 remaining = SIMPLE_TRANSACTION_LIMIT; 842 for (num=2 ; num <= 4 ; num++) 843 if (nfsd_vers(num, NFSD_AVAIL)) { 844 len = snprintf(buf, remaining, "%s%c%d", sep, 845 nfsd_vers(num, NFSD_TEST)?'+':'-', 846 num); 847 sep = " "; 848 849 if (len > remaining) 850 break; 851 remaining -= len; 852 buf += len; 853 tlen += len; 854 } 855 if (nfsd_vers(4, NFSD_AVAIL)) 856 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION; 857 minor++) { 858 len = snprintf(buf, remaining, " %c4.%u", 859 (nfsd_vers(4, NFSD_TEST) && 860 nfsd_minorversion(minor, NFSD_TEST)) ? 861 '+' : '-', 862 minor); 863 864 if (len > remaining) 865 break; 866 remaining -= len; 867 buf += len; 868 tlen += len; 869 } 870 871 len = snprintf(buf, remaining, "\n"); 872 if (len > remaining) 873 return -EINVAL; 874 return tlen + len; 875 } 876 877 /** 878 * write_versions - Set or report the available NFS protocol versions 879 * 880 * Input: 881 * buf: ignored 882 * size: zero 883 * Output: 884 * On success: passed-in buffer filled with '\n'-terminated C 885 * string containing positive or negative integer 886 * values representing the current status of each 887 * protocol version; 888 * return code is the size in bytes of the string 889 * On error: return code is zero or a negative errno value 890 * 891 * OR 892 * 893 * Input: 894 * buf: C string containing whitespace- 895 * separated positive or negative 896 * integer values representing NFS 897 * protocol versions to enable ("+n") 898 * or disable ("-n") 899 * size: non-zero length of C string in @buf 900 * Output: 901 * On success: status of zero or more protocol versions has 902 * been updated; passed-in buffer filled with 903 * '\n'-terminated C string containing positive 904 * or negative integer values representing the 905 * current status of each protocol version; 906 * return code is the size in bytes of the string 907 * On error: return code is zero or a negative errno value 908 */ 909 static ssize_t write_versions(struct file *file, char *buf, size_t size) 910 { 911 ssize_t rv; 912 913 mutex_lock(&nfsd_mutex); 914 rv = __write_versions(file, buf, size); 915 mutex_unlock(&nfsd_mutex); 916 return rv; 917 } 918 919 /* 920 * Zero-length write. Return a list of NFSD's current listener 921 * transports. 922 */ 923 static ssize_t __write_ports_names(char *buf) 924 { 925 if (nfsd_serv == NULL) 926 return 0; 927 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); 928 } 929 930 /* 931 * A single 'fd' number was written, in which case it must be for 932 * a socket of a supported family/protocol, and we use it as an 933 * nfsd listener. 934 */ 935 static ssize_t __write_ports_addfd(char *buf) 936 { 937 char *mesg = buf; 938 int fd, err; 939 940 err = get_int(&mesg, &fd); 941 if (err != 0 || fd < 0) 942 return -EINVAL; 943 944 err = nfsd_create_serv(); 945 if (err != 0) 946 return err; 947 948 err = lockd_up(); 949 if (err != 0) 950 goto out; 951 952 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT); 953 if (err < 0) 954 lockd_down(); 955 956 out: 957 /* Decrease the count, but don't shut down the service */ 958 nfsd_serv->sv_nrthreads--; 959 return err; 960 } 961 962 /* 963 * A '-' followed by the 'name' of a socket means we close the socket. 964 */ 965 static ssize_t __write_ports_delfd(char *buf) 966 { 967 char *toclose; 968 int len = 0; 969 970 toclose = kstrdup(buf + 1, GFP_KERNEL); 971 if (toclose == NULL) 972 return -ENOMEM; 973 974 if (nfsd_serv != NULL) 975 len = svc_sock_names(nfsd_serv, buf, 976 SIMPLE_TRANSACTION_LIMIT, toclose); 977 if (len >= 0) 978 lockd_down(); 979 980 kfree(toclose); 981 return len; 982 } 983 984 /* 985 * A transport listener is added by writing it's transport name and 986 * a port number. 987 */ 988 static ssize_t __write_ports_addxprt(char *buf) 989 { 990 char transport[16]; 991 int port, err; 992 993 if (sscanf(buf, "%15s %4u", transport, &port) != 2) 994 return -EINVAL; 995 996 if (port < 1 || port > USHORT_MAX) 997 return -EINVAL; 998 999 err = nfsd_create_serv(); 1000 if (err != 0) 1001 return err; 1002 1003 err = svc_create_xprt(nfsd_serv, transport, 1004 PF_INET, port, SVC_SOCK_ANONYMOUS); 1005 if (err < 0) { 1006 /* Give a reasonable perror msg for bad transport string */ 1007 if (err == -ENOENT) 1008 err = -EPROTONOSUPPORT; 1009 return err; 1010 } 1011 return 0; 1012 } 1013 1014 /* 1015 * A transport listener is removed by writing a "-", it's transport 1016 * name, and it's port number. 1017 */ 1018 static ssize_t __write_ports_delxprt(char *buf) 1019 { 1020 struct svc_xprt *xprt; 1021 char transport[16]; 1022 int port; 1023 1024 if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2) 1025 return -EINVAL; 1026 1027 if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL) 1028 return -EINVAL; 1029 1030 xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port); 1031 if (xprt == NULL) 1032 return -ENOTCONN; 1033 1034 svc_close_xprt(xprt); 1035 svc_xprt_put(xprt); 1036 return 0; 1037 } 1038 1039 static ssize_t __write_ports(struct file *file, char *buf, size_t size) 1040 { 1041 if (size == 0) 1042 return __write_ports_names(buf); 1043 1044 if (isdigit(buf[0])) 1045 return __write_ports_addfd(buf); 1046 1047 if (buf[0] == '-' && isdigit(buf[1])) 1048 return __write_ports_delfd(buf); 1049 1050 if (isalpha(buf[0])) 1051 return __write_ports_addxprt(buf); 1052 1053 if (buf[0] == '-' && isalpha(buf[1])) 1054 return __write_ports_delxprt(buf); 1055 1056 return -EINVAL; 1057 } 1058 1059 /** 1060 * write_ports - Pass a socket file descriptor or transport name to listen on 1061 * 1062 * Input: 1063 * buf: ignored 1064 * size: zero 1065 * Output: 1066 * On success: passed-in buffer filled with a '\n'-terminated C 1067 * string containing a whitespace-separated list of 1068 * named NFSD listeners; 1069 * return code is the size in bytes of the string 1070 * On error: return code is zero or a negative errno value 1071 * 1072 * OR 1073 * 1074 * Input: 1075 * buf: C string containing an unsigned 1076 * integer value representing a bound 1077 * but unconnected socket that is to be 1078 * used as an NFSD listener; listen(3) 1079 * must be called for a SOCK_STREAM 1080 * socket, otherwise it is ignored 1081 * size: non-zero length of C string in @buf 1082 * Output: 1083 * On success: NFS service is started; 1084 * passed-in buffer filled with a '\n'-terminated C 1085 * string containing a unique alphanumeric name of 1086 * the listener; 1087 * return code is the size in bytes of the string 1088 * On error: return code is a negative errno value 1089 * 1090 * OR 1091 * 1092 * Input: 1093 * buf: C string containing a "-" followed 1094 * by an integer value representing a 1095 * previously passed in socket file 1096 * descriptor 1097 * size: non-zero length of C string in @buf 1098 * Output: 1099 * On success: NFS service no longer listens on that socket; 1100 * passed-in buffer filled with a '\n'-terminated C 1101 * string containing a unique name of the listener; 1102 * return code is the size in bytes of the string 1103 * On error: return code is a negative errno value 1104 * 1105 * OR 1106 * 1107 * Input: 1108 * buf: C string containing a transport 1109 * name and an unsigned integer value 1110 * representing the port to listen on, 1111 * separated by whitespace 1112 * size: non-zero length of C string in @buf 1113 * Output: 1114 * On success: returns zero; NFS service is started 1115 * On error: return code is a negative errno value 1116 * 1117 * OR 1118 * 1119 * Input: 1120 * buf: C string containing a "-" followed 1121 * by a transport name and an unsigned 1122 * integer value representing the port 1123 * to listen on, separated by whitespace 1124 * size: non-zero length of C string in @buf 1125 * Output: 1126 * On success: returns zero; NFS service no longer listens 1127 * on that transport 1128 * On error: return code is a negative errno value 1129 */ 1130 static ssize_t write_ports(struct file *file, char *buf, size_t size) 1131 { 1132 ssize_t rv; 1133 1134 mutex_lock(&nfsd_mutex); 1135 rv = __write_ports(file, buf, size); 1136 mutex_unlock(&nfsd_mutex); 1137 return rv; 1138 } 1139 1140 1141 int nfsd_max_blksize; 1142 1143 /** 1144 * write_maxblksize - Set or report the current NFS blksize 1145 * 1146 * Input: 1147 * buf: ignored 1148 * size: zero 1149 * 1150 * OR 1151 * 1152 * Input: 1153 * buf: C string containing an unsigned 1154 * integer value representing the new 1155 * NFS blksize 1156 * size: non-zero length of C string in @buf 1157 * Output: 1158 * On success: passed-in buffer filled with '\n'-terminated C string 1159 * containing numeric value of the current NFS blksize 1160 * setting; 1161 * return code is the size in bytes of the string 1162 * On error: return code is zero or a negative errno value 1163 */ 1164 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 1165 { 1166 char *mesg = buf; 1167 if (size > 0) { 1168 int bsize; 1169 int rv = get_int(&mesg, &bsize); 1170 if (rv) 1171 return rv; 1172 /* force bsize into allowed range and 1173 * required alignment. 1174 */ 1175 if (bsize < 1024) 1176 bsize = 1024; 1177 if (bsize > NFSSVC_MAXBLKSIZE) 1178 bsize = NFSSVC_MAXBLKSIZE; 1179 bsize &= ~(1024-1); 1180 mutex_lock(&nfsd_mutex); 1181 if (nfsd_serv && nfsd_serv->sv_nrthreads) { 1182 mutex_unlock(&nfsd_mutex); 1183 return -EBUSY; 1184 } 1185 nfsd_max_blksize = bsize; 1186 mutex_unlock(&nfsd_mutex); 1187 } 1188 1189 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 1190 nfsd_max_blksize); 1191 } 1192 1193 #ifdef CONFIG_NFSD_V4 1194 extern time_t nfs4_leasetime(void); 1195 1196 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size) 1197 { 1198 /* if size > 10 seconds, call 1199 * nfs4_reset_lease() then write out the new lease (seconds) as reply 1200 */ 1201 char *mesg = buf; 1202 int rv, lease; 1203 1204 if (size > 0) { 1205 if (nfsd_serv) 1206 return -EBUSY; 1207 rv = get_int(&mesg, &lease); 1208 if (rv) 1209 return rv; 1210 if (lease < 10 || lease > 3600) 1211 return -EINVAL; 1212 nfs4_reset_lease(lease); 1213 } 1214 1215 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", 1216 nfs4_lease_time()); 1217 } 1218 1219 /** 1220 * write_leasetime - Set or report the current NFSv4 lease time 1221 * 1222 * Input: 1223 * buf: ignored 1224 * size: zero 1225 * 1226 * OR 1227 * 1228 * Input: 1229 * buf: C string containing an unsigned 1230 * integer value representing the new 1231 * NFSv4 lease expiry time 1232 * size: non-zero length of C string in @buf 1233 * Output: 1234 * On success: passed-in buffer filled with '\n'-terminated C 1235 * string containing unsigned integer value of the 1236 * current lease expiry time; 1237 * return code is the size in bytes of the string 1238 * On error: return code is zero or a negative errno value 1239 */ 1240 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 1241 { 1242 ssize_t rv; 1243 1244 mutex_lock(&nfsd_mutex); 1245 rv = __write_leasetime(file, buf, size); 1246 mutex_unlock(&nfsd_mutex); 1247 return rv; 1248 } 1249 1250 extern char *nfs4_recoverydir(void); 1251 1252 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size) 1253 { 1254 char *mesg = buf; 1255 char *recdir; 1256 int len, status; 1257 1258 if (size > 0) { 1259 if (nfsd_serv) 1260 return -EBUSY; 1261 if (size > PATH_MAX || buf[size-1] != '\n') 1262 return -EINVAL; 1263 buf[size-1] = 0; 1264 1265 recdir = mesg; 1266 len = qword_get(&mesg, recdir, size); 1267 if (len <= 0) 1268 return -EINVAL; 1269 1270 status = nfs4_reset_recoverydir(recdir); 1271 } 1272 1273 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 1274 nfs4_recoverydir()); 1275 } 1276 1277 /** 1278 * write_recoverydir - Set or report the pathname of the recovery directory 1279 * 1280 * Input: 1281 * buf: ignored 1282 * size: zero 1283 * 1284 * OR 1285 * 1286 * Input: 1287 * buf: C string containing the pathname 1288 * of the directory on a local file 1289 * system containing permanent NFSv4 1290 * recovery data 1291 * size: non-zero length of C string in @buf 1292 * Output: 1293 * On success: passed-in buffer filled with '\n'-terminated C string 1294 * containing the current recovery pathname setting; 1295 * return code is the size in bytes of the string 1296 * On error: return code is zero or a negative errno value 1297 */ 1298 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1299 { 1300 ssize_t rv; 1301 1302 mutex_lock(&nfsd_mutex); 1303 rv = __write_recoverydir(file, buf, size); 1304 mutex_unlock(&nfsd_mutex); 1305 return rv; 1306 } 1307 1308 #endif 1309 1310 /*----------------------------------------------------------------------------*/ 1311 /* 1312 * populating the filesystem. 1313 */ 1314 1315 static int nfsd_fill_super(struct super_block * sb, void * data, int silent) 1316 { 1317 static struct tree_descr nfsd_files[] = { 1318 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR}, 1319 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR}, 1320 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR}, 1321 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR}, 1322 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR}, 1323 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR}, 1324 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR}, 1325 [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, 1326 [NFSD_Export_features] = {"export_features", 1327 &export_features_operations, S_IRUGO}, 1328 [NFSD_FO_UnlockIP] = {"unlock_ip", 1329 &transaction_ops, S_IWUSR|S_IRUSR}, 1330 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1331 &transaction_ops, S_IWUSR|S_IRUSR}, 1332 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1333 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1334 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1335 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1336 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1337 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1338 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1339 #ifdef CONFIG_NFSD_V4 1340 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1341 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1342 #endif 1343 /* last one */ {""} 1344 }; 1345 return simple_fill_super(sb, 0x6e667364, nfsd_files); 1346 } 1347 1348 static int nfsd_get_sb(struct file_system_type *fs_type, 1349 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 1350 { 1351 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt); 1352 } 1353 1354 static struct file_system_type nfsd_fs_type = { 1355 .owner = THIS_MODULE, 1356 .name = "nfsd", 1357 .get_sb = nfsd_get_sb, 1358 .kill_sb = kill_litter_super, 1359 }; 1360 1361 #ifdef CONFIG_PROC_FS 1362 static int create_proc_exports_entry(void) 1363 { 1364 struct proc_dir_entry *entry; 1365 1366 entry = proc_mkdir("fs/nfs", NULL); 1367 if (!entry) 1368 return -ENOMEM; 1369 entry = proc_create("exports", 0, entry, &exports_operations); 1370 if (!entry) 1371 return -ENOMEM; 1372 return 0; 1373 } 1374 #else /* CONFIG_PROC_FS */ 1375 static int create_proc_exports_entry(void) 1376 { 1377 return 0; 1378 } 1379 #endif 1380 1381 static int __init init_nfsd(void) 1382 { 1383 int retval; 1384 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); 1385 1386 retval = nfs4_state_init(); /* nfs4 locking state */ 1387 if (retval) 1388 return retval; 1389 nfsd_stat_init(); /* Statistics */ 1390 retval = nfsd_reply_cache_init(); 1391 if (retval) 1392 goto out_free_stat; 1393 retval = nfsd_export_init(); 1394 if (retval) 1395 goto out_free_cache; 1396 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 1397 retval = nfsd_idmap_init(); 1398 if (retval) 1399 goto out_free_lockd; 1400 retval = create_proc_exports_entry(); 1401 if (retval) 1402 goto out_free_idmap; 1403 retval = register_filesystem(&nfsd_fs_type); 1404 if (retval) 1405 goto out_free_all; 1406 return 0; 1407 out_free_all: 1408 remove_proc_entry("fs/nfs/exports", NULL); 1409 remove_proc_entry("fs/nfs", NULL); 1410 out_free_idmap: 1411 nfsd_idmap_shutdown(); 1412 out_free_lockd: 1413 nfsd_lockd_shutdown(); 1414 nfsd_export_shutdown(); 1415 out_free_cache: 1416 nfsd_reply_cache_shutdown(); 1417 out_free_stat: 1418 nfsd_stat_shutdown(); 1419 nfsd4_free_slabs(); 1420 return retval; 1421 } 1422 1423 static void __exit exit_nfsd(void) 1424 { 1425 nfsd_export_shutdown(); 1426 nfsd_reply_cache_shutdown(); 1427 remove_proc_entry("fs/nfs/exports", NULL); 1428 remove_proc_entry("fs/nfs", NULL); 1429 nfsd_stat_shutdown(); 1430 nfsd_lockd_shutdown(); 1431 nfsd_idmap_shutdown(); 1432 nfsd4_free_slabs(); 1433 unregister_filesystem(&nfsd_fs_type); 1434 } 1435 1436 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1437 MODULE_LICENSE("GPL"); 1438 module_init(init_nfsd) 1439 module_exit(exit_nfsd) 1440