1 /* 2 * linux/fs/nfsd/nfsctl.c 3 * 4 * Syscall interface to knfsd. 5 * 6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 7 */ 8 9 #include <linux/module.h> 10 11 #include <linux/linkage.h> 12 #include <linux/time.h> 13 #include <linux/errno.h> 14 #include <linux/fs.h> 15 #include <linux/fcntl.h> 16 #include <linux/net.h> 17 #include <linux/in.h> 18 #include <linux/syscalls.h> 19 #include <linux/unistd.h> 20 #include <linux/slab.h> 21 #include <linux/proc_fs.h> 22 #include <linux/seq_file.h> 23 #include <linux/pagemap.h> 24 #include <linux/init.h> 25 #include <linux/inet.h> 26 #include <linux/string.h> 27 #include <linux/smp_lock.h> 28 #include <linux/ctype.h> 29 30 #include <linux/nfs.h> 31 #include <linux/nfsd_idmap.h> 32 #include <linux/lockd/bind.h> 33 #include <linux/sunrpc/svc.h> 34 #include <linux/sunrpc/svcsock.h> 35 #include <linux/nfsd/nfsd.h> 36 #include <linux/nfsd/cache.h> 37 #include <linux/nfsd/xdr.h> 38 #include <linux/nfsd/syscall.h> 39 #include <linux/lockd/lockd.h> 40 41 #include <asm/uaccess.h> 42 #include <net/ipv6.h> 43 44 /* 45 * We have a single directory with 9 nodes in it. 46 */ 47 enum { 48 NFSD_Root = 1, 49 NFSD_Svc, 50 NFSD_Add, 51 NFSD_Del, 52 NFSD_Export, 53 NFSD_Unexport, 54 NFSD_Getfd, 55 NFSD_Getfs, 56 NFSD_List, 57 NFSD_Fh, 58 NFSD_FO_UnlockIP, 59 NFSD_FO_UnlockFS, 60 NFSD_Threads, 61 NFSD_Pool_Threads, 62 NFSD_Versions, 63 NFSD_Ports, 64 NFSD_MaxBlkSize, 65 /* 66 * The below MUST come last. Otherwise we leave a hole in nfsd_files[] 67 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops 68 */ 69 #ifdef CONFIG_NFSD_V4 70 NFSD_Leasetime, 71 NFSD_RecoveryDir, 72 #endif 73 }; 74 75 /* 76 * write() for these nodes. 77 */ 78 static ssize_t write_svc(struct file *file, char *buf, size_t size); 79 static ssize_t write_add(struct file *file, char *buf, size_t size); 80 static ssize_t write_del(struct file *file, char *buf, size_t size); 81 static ssize_t write_export(struct file *file, char *buf, size_t size); 82 static ssize_t write_unexport(struct file *file, char *buf, size_t size); 83 static ssize_t write_getfd(struct file *file, char *buf, size_t size); 84 static ssize_t write_getfs(struct file *file, char *buf, size_t size); 85 static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 86 static ssize_t write_threads(struct file *file, char *buf, size_t size); 87 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 88 static ssize_t write_versions(struct file *file, char *buf, size_t size); 89 static ssize_t write_ports(struct file *file, char *buf, size_t size); 90 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 91 #ifdef CONFIG_NFSD_V4 92 static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 93 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 94 #endif 95 96 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size); 97 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size); 98 99 static ssize_t (*write_op[])(struct file *, char *, size_t) = { 100 [NFSD_Svc] = write_svc, 101 [NFSD_Add] = write_add, 102 [NFSD_Del] = write_del, 103 [NFSD_Export] = write_export, 104 [NFSD_Unexport] = write_unexport, 105 [NFSD_Getfd] = write_getfd, 106 [NFSD_Getfs] = write_getfs, 107 [NFSD_Fh] = write_filehandle, 108 [NFSD_FO_UnlockIP] = failover_unlock_ip, 109 [NFSD_FO_UnlockFS] = failover_unlock_fs, 110 [NFSD_Threads] = write_threads, 111 [NFSD_Pool_Threads] = write_pool_threads, 112 [NFSD_Versions] = write_versions, 113 [NFSD_Ports] = write_ports, 114 [NFSD_MaxBlkSize] = write_maxblksize, 115 #ifdef CONFIG_NFSD_V4 116 [NFSD_Leasetime] = write_leasetime, 117 [NFSD_RecoveryDir] = write_recoverydir, 118 #endif 119 }; 120 121 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 122 { 123 ino_t ino = file->f_path.dentry->d_inode->i_ino; 124 char *data; 125 ssize_t rv; 126 127 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 128 return -EINVAL; 129 130 data = simple_transaction_get(file, buf, size); 131 if (IS_ERR(data)) 132 return PTR_ERR(data); 133 134 rv = write_op[ino](file, data, size); 135 if (rv >= 0) { 136 simple_transaction_set(file, rv); 137 rv = size; 138 } 139 return rv; 140 } 141 142 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) 143 { 144 if (! file->private_data) { 145 /* An attempt to read a transaction file without writing 146 * causes a 0-byte write so that the file can return 147 * state information 148 */ 149 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); 150 if (rv < 0) 151 return rv; 152 } 153 return simple_transaction_read(file, buf, size, pos); 154 } 155 156 static const struct file_operations transaction_ops = { 157 .write = nfsctl_transaction_write, 158 .read = nfsctl_transaction_read, 159 .release = simple_transaction_release, 160 }; 161 162 static int exports_open(struct inode *inode, struct file *file) 163 { 164 return seq_open(file, &nfs_exports_op); 165 } 166 167 static const struct file_operations exports_operations = { 168 .open = exports_open, 169 .read = seq_read, 170 .llseek = seq_lseek, 171 .release = seq_release, 172 .owner = THIS_MODULE, 173 }; 174 175 /*----------------------------------------------------------------------------*/ 176 /* 177 * payload - write methods 178 * If the method has a response, the response should be put in buf, 179 * and the length returned. Otherwise return 0 or and -error. 180 */ 181 182 static ssize_t write_svc(struct file *file, char *buf, size_t size) 183 { 184 struct nfsctl_svc *data; 185 if (size < sizeof(*data)) 186 return -EINVAL; 187 data = (struct nfsctl_svc*) buf; 188 return nfsd_svc(data->svc_port, data->svc_nthreads); 189 } 190 191 static ssize_t write_add(struct file *file, char *buf, size_t size) 192 { 193 struct nfsctl_client *data; 194 if (size < sizeof(*data)) 195 return -EINVAL; 196 data = (struct nfsctl_client *)buf; 197 return exp_addclient(data); 198 } 199 200 static ssize_t write_del(struct file *file, char *buf, size_t size) 201 { 202 struct nfsctl_client *data; 203 if (size < sizeof(*data)) 204 return -EINVAL; 205 data = (struct nfsctl_client *)buf; 206 return exp_delclient(data); 207 } 208 209 static ssize_t write_export(struct file *file, char *buf, size_t size) 210 { 211 struct nfsctl_export *data; 212 if (size < sizeof(*data)) 213 return -EINVAL; 214 data = (struct nfsctl_export*)buf; 215 return exp_export(data); 216 } 217 218 static ssize_t write_unexport(struct file *file, char *buf, size_t size) 219 { 220 struct nfsctl_export *data; 221 222 if (size < sizeof(*data)) 223 return -EINVAL; 224 data = (struct nfsctl_export*)buf; 225 return exp_unexport(data); 226 } 227 228 static ssize_t write_getfs(struct file *file, char *buf, size_t size) 229 { 230 struct nfsctl_fsparm *data; 231 struct sockaddr_in *sin; 232 struct auth_domain *clp; 233 int err = 0; 234 struct knfsd_fh *res; 235 struct in6_addr in6; 236 237 if (size < sizeof(*data)) 238 return -EINVAL; 239 data = (struct nfsctl_fsparm*)buf; 240 err = -EPROTONOSUPPORT; 241 if (data->gd_addr.sa_family != AF_INET) 242 goto out; 243 sin = (struct sockaddr_in *)&data->gd_addr; 244 if (data->gd_maxlen > NFS3_FHSIZE) 245 data->gd_maxlen = NFS3_FHSIZE; 246 247 res = (struct knfsd_fh*)buf; 248 249 exp_readlock(); 250 251 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6); 252 253 clp = auth_unix_lookup(&in6); 254 if (!clp) 255 err = -EPERM; 256 else { 257 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen); 258 auth_domain_put(clp); 259 } 260 exp_readunlock(); 261 if (err == 0) 262 err = res->fh_size + offsetof(struct knfsd_fh, fh_base); 263 out: 264 return err; 265 } 266 267 static ssize_t write_getfd(struct file *file, char *buf, size_t size) 268 { 269 struct nfsctl_fdparm *data; 270 struct sockaddr_in *sin; 271 struct auth_domain *clp; 272 int err = 0; 273 struct knfsd_fh fh; 274 char *res; 275 struct in6_addr in6; 276 277 if (size < sizeof(*data)) 278 return -EINVAL; 279 data = (struct nfsctl_fdparm*)buf; 280 err = -EPROTONOSUPPORT; 281 if (data->gd_addr.sa_family != AF_INET) 282 goto out; 283 err = -EINVAL; 284 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS) 285 goto out; 286 287 res = buf; 288 sin = (struct sockaddr_in *)&data->gd_addr; 289 exp_readlock(); 290 291 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6); 292 293 clp = auth_unix_lookup(&in6); 294 if (!clp) 295 err = -EPERM; 296 else { 297 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE); 298 auth_domain_put(clp); 299 } 300 exp_readunlock(); 301 302 if (err == 0) { 303 memset(res,0, NFS_FHSIZE); 304 memcpy(res, &fh.fh_base, fh.fh_size); 305 err = NFS_FHSIZE; 306 } 307 out: 308 return err; 309 } 310 311 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size) 312 { 313 struct sockaddr_in sin = { 314 .sin_family = AF_INET, 315 }; 316 int b1, b2, b3, b4; 317 char c; 318 char *fo_path; 319 320 /* sanity check */ 321 if (size == 0) 322 return -EINVAL; 323 324 if (buf[size-1] != '\n') 325 return -EINVAL; 326 327 fo_path = buf; 328 if (qword_get(&buf, fo_path, size) < 0) 329 return -EINVAL; 330 331 /* get ipv4 address */ 332 if (sscanf(fo_path, NIPQUAD_FMT "%c", &b1, &b2, &b3, &b4, &c) != 4) 333 return -EINVAL; 334 if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255) 335 return -EINVAL; 336 sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4); 337 338 return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin); 339 } 340 341 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size) 342 { 343 struct nameidata nd; 344 char *fo_path; 345 int error; 346 347 /* sanity check */ 348 if (size == 0) 349 return -EINVAL; 350 351 if (buf[size-1] != '\n') 352 return -EINVAL; 353 354 fo_path = buf; 355 if (qword_get(&buf, fo_path, size) < 0) 356 return -EINVAL; 357 358 error = path_lookup(fo_path, 0, &nd); 359 if (error) 360 return error; 361 362 error = nlmsvc_unlock_all_by_sb(nd.path.mnt->mnt_sb); 363 364 path_put(&nd.path); 365 return error; 366 } 367 368 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 369 { 370 /* request is: 371 * domain path maxsize 372 * response is 373 * filehandle 374 * 375 * qword quoting is used, so filehandle will be \x.... 376 */ 377 char *dname, *path; 378 int uninitialized_var(maxsize); 379 char *mesg = buf; 380 int len; 381 struct auth_domain *dom; 382 struct knfsd_fh fh; 383 384 if (size == 0) 385 return -EINVAL; 386 387 if (buf[size-1] != '\n') 388 return -EINVAL; 389 buf[size-1] = 0; 390 391 dname = mesg; 392 len = qword_get(&mesg, dname, size); 393 if (len <= 0) return -EINVAL; 394 395 path = dname+len+1; 396 len = qword_get(&mesg, path, size); 397 if (len <= 0) return -EINVAL; 398 399 len = get_int(&mesg, &maxsize); 400 if (len) 401 return len; 402 403 if (maxsize < NFS_FHSIZE) 404 return -EINVAL; 405 if (maxsize > NFS3_FHSIZE) 406 maxsize = NFS3_FHSIZE; 407 408 if (qword_get(&mesg, mesg, size)>0) 409 return -EINVAL; 410 411 /* we have all the words, they are in buf.. */ 412 dom = unix_domain_find(dname); 413 if (!dom) 414 return -ENOMEM; 415 416 len = exp_rootfh(dom, path, &fh, maxsize); 417 auth_domain_put(dom); 418 if (len) 419 return len; 420 421 mesg = buf; len = SIMPLE_TRANSACTION_LIMIT; 422 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); 423 mesg[-1] = '\n'; 424 return mesg - buf; 425 } 426 427 static ssize_t write_threads(struct file *file, char *buf, size_t size) 428 { 429 /* if size > 0, look for a number of threads and call nfsd_svc 430 * then write out number of threads as reply 431 */ 432 char *mesg = buf; 433 int rv; 434 if (size > 0) { 435 int newthreads; 436 rv = get_int(&mesg, &newthreads); 437 if (rv) 438 return rv; 439 if (newthreads <0) 440 return -EINVAL; 441 rv = nfsd_svc(2049, newthreads); 442 if (rv) 443 return rv; 444 } 445 sprintf(buf, "%d\n", nfsd_nrthreads()); 446 return strlen(buf); 447 } 448 449 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 450 { 451 /* if size > 0, look for an array of number of threads per node 452 * and apply them then write out number of threads per node as reply 453 */ 454 char *mesg = buf; 455 int i; 456 int rv; 457 int len; 458 int npools; 459 int *nthreads; 460 461 mutex_lock(&nfsd_mutex); 462 npools = nfsd_nrpools(); 463 if (npools == 0) { 464 /* 465 * NFS is shut down. The admin can start it by 466 * writing to the threads file but NOT the pool_threads 467 * file, sorry. Report zero threads. 468 */ 469 mutex_unlock(&nfsd_mutex); 470 strcpy(buf, "0\n"); 471 return strlen(buf); 472 } 473 474 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); 475 rv = -ENOMEM; 476 if (nthreads == NULL) 477 goto out_free; 478 479 if (size > 0) { 480 for (i = 0; i < npools; i++) { 481 rv = get_int(&mesg, &nthreads[i]); 482 if (rv == -ENOENT) 483 break; /* fewer numbers than pools */ 484 if (rv) 485 goto out_free; /* syntax error */ 486 rv = -EINVAL; 487 if (nthreads[i] < 0) 488 goto out_free; 489 } 490 rv = nfsd_set_nrthreads(i, nthreads); 491 if (rv) 492 goto out_free; 493 } 494 495 rv = nfsd_get_nrthreads(npools, nthreads); 496 if (rv) 497 goto out_free; 498 499 mesg = buf; 500 size = SIMPLE_TRANSACTION_LIMIT; 501 for (i = 0; i < npools && size > 0; i++) { 502 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 503 len = strlen(mesg); 504 size -= len; 505 mesg += len; 506 } 507 508 mutex_unlock(&nfsd_mutex); 509 return (mesg-buf); 510 511 out_free: 512 kfree(nthreads); 513 mutex_unlock(&nfsd_mutex); 514 return rv; 515 } 516 517 static ssize_t __write_versions(struct file *file, char *buf, size_t size) 518 { 519 /* 520 * Format: 521 * [-/+]vers [-/+]vers ... 522 */ 523 char *mesg = buf; 524 char *vers, sign; 525 int len, num; 526 ssize_t tlen = 0; 527 char *sep; 528 529 if (size>0) { 530 if (nfsd_serv) 531 /* Cannot change versions without updating 532 * nfsd_serv->sv_xdrsize, and reallocing 533 * rq_argp and rq_resp 534 */ 535 return -EBUSY; 536 if (buf[size-1] != '\n') 537 return -EINVAL; 538 buf[size-1] = 0; 539 540 vers = mesg; 541 len = qword_get(&mesg, vers, size); 542 if (len <= 0) return -EINVAL; 543 do { 544 sign = *vers; 545 if (sign == '+' || sign == '-') 546 num = simple_strtol((vers+1), NULL, 0); 547 else 548 num = simple_strtol(vers, NULL, 0); 549 switch(num) { 550 case 2: 551 case 3: 552 case 4: 553 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET); 554 break; 555 default: 556 return -EINVAL; 557 } 558 vers += len + 1; 559 tlen += len; 560 } while ((len = qword_get(&mesg, vers, size)) > 0); 561 /* If all get turned off, turn them back on, as 562 * having no versions is BAD 563 */ 564 nfsd_reset_versions(); 565 } 566 /* Now write current state into reply buffer */ 567 len = 0; 568 sep = ""; 569 for (num=2 ; num <= 4 ; num++) 570 if (nfsd_vers(num, NFSD_AVAIL)) { 571 len += sprintf(buf+len, "%s%c%d", sep, 572 nfsd_vers(num, NFSD_TEST)?'+':'-', 573 num); 574 sep = " "; 575 } 576 len += sprintf(buf+len, "\n"); 577 return len; 578 } 579 580 static ssize_t write_versions(struct file *file, char *buf, size_t size) 581 { 582 ssize_t rv; 583 584 mutex_lock(&nfsd_mutex); 585 rv = __write_versions(file, buf, size); 586 mutex_unlock(&nfsd_mutex); 587 return rv; 588 } 589 590 static ssize_t __write_ports(struct file *file, char *buf, size_t size) 591 { 592 if (size == 0) { 593 int len = 0; 594 595 if (nfsd_serv) 596 len = svc_xprt_names(nfsd_serv, buf, 0); 597 return len; 598 } 599 /* Either a single 'fd' number is written, in which 600 * case it must be for a socket of a supported family/protocol, 601 * and we use it as an nfsd socket, or 602 * A '-' followed by the 'name' of a socket in which case 603 * we close the socket. 604 */ 605 if (isdigit(buf[0])) { 606 char *mesg = buf; 607 int fd; 608 int err; 609 err = get_int(&mesg, &fd); 610 if (err) 611 return -EINVAL; 612 if (fd < 0) 613 return -EINVAL; 614 err = nfsd_create_serv(); 615 if (!err) { 616 int proto = 0; 617 err = svc_addsock(nfsd_serv, fd, buf, &proto); 618 if (err >= 0) { 619 err = lockd_up(proto); 620 if (err < 0) 621 svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf); 622 } 623 /* Decrease the count, but don't shutdown the 624 * the service 625 */ 626 nfsd_serv->sv_nrthreads--; 627 } 628 return err < 0 ? err : 0; 629 } 630 if (buf[0] == '-' && isdigit(buf[1])) { 631 char *toclose = kstrdup(buf+1, GFP_KERNEL); 632 int len = 0; 633 if (!toclose) 634 return -ENOMEM; 635 if (nfsd_serv) 636 len = svc_sock_names(buf, nfsd_serv, toclose); 637 if (len >= 0) 638 lockd_down(); 639 kfree(toclose); 640 return len; 641 } 642 /* 643 * Add a transport listener by writing it's transport name 644 */ 645 if (isalpha(buf[0])) { 646 int err; 647 char transport[16]; 648 int port; 649 if (sscanf(buf, "%15s %4d", transport, &port) == 2) { 650 err = nfsd_create_serv(); 651 if (!err) { 652 err = svc_create_xprt(nfsd_serv, 653 transport, port, 654 SVC_SOCK_ANONYMOUS); 655 if (err == -ENOENT) 656 /* Give a reasonable perror msg for 657 * bad transport string */ 658 err = -EPROTONOSUPPORT; 659 } 660 return err < 0 ? err : 0; 661 } 662 } 663 /* 664 * Remove a transport by writing it's transport name and port number 665 */ 666 if (buf[0] == '-' && isalpha(buf[1])) { 667 struct svc_xprt *xprt; 668 int err = -EINVAL; 669 char transport[16]; 670 int port; 671 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) { 672 if (port == 0) 673 return -EINVAL; 674 if (nfsd_serv) { 675 xprt = svc_find_xprt(nfsd_serv, transport, 676 AF_UNSPEC, port); 677 if (xprt) { 678 svc_close_xprt(xprt); 679 svc_xprt_put(xprt); 680 err = 0; 681 } else 682 err = -ENOTCONN; 683 } 684 return err < 0 ? err : 0; 685 } 686 } 687 return -EINVAL; 688 } 689 690 static ssize_t write_ports(struct file *file, char *buf, size_t size) 691 { 692 ssize_t rv; 693 694 mutex_lock(&nfsd_mutex); 695 rv = __write_ports(file, buf, size); 696 mutex_unlock(&nfsd_mutex); 697 return rv; 698 } 699 700 701 int nfsd_max_blksize; 702 703 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 704 { 705 char *mesg = buf; 706 if (size > 0) { 707 int bsize; 708 int rv = get_int(&mesg, &bsize); 709 if (rv) 710 return rv; 711 /* force bsize into allowed range and 712 * required alignment. 713 */ 714 if (bsize < 1024) 715 bsize = 1024; 716 if (bsize > NFSSVC_MAXBLKSIZE) 717 bsize = NFSSVC_MAXBLKSIZE; 718 bsize &= ~(1024-1); 719 mutex_lock(&nfsd_mutex); 720 if (nfsd_serv && nfsd_serv->sv_nrthreads) { 721 mutex_unlock(&nfsd_mutex); 722 return -EBUSY; 723 } 724 nfsd_max_blksize = bsize; 725 mutex_unlock(&nfsd_mutex); 726 } 727 return sprintf(buf, "%d\n", nfsd_max_blksize); 728 } 729 730 #ifdef CONFIG_NFSD_V4 731 extern time_t nfs4_leasetime(void); 732 733 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size) 734 { 735 /* if size > 10 seconds, call 736 * nfs4_reset_lease() then write out the new lease (seconds) as reply 737 */ 738 char *mesg = buf; 739 int rv, lease; 740 741 if (size > 0) { 742 if (nfsd_serv) 743 return -EBUSY; 744 rv = get_int(&mesg, &lease); 745 if (rv) 746 return rv; 747 if (lease < 10 || lease > 3600) 748 return -EINVAL; 749 nfs4_reset_lease(lease); 750 } 751 sprintf(buf, "%ld\n", nfs4_lease_time()); 752 return strlen(buf); 753 } 754 755 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 756 { 757 ssize_t rv; 758 759 mutex_lock(&nfsd_mutex); 760 rv = __write_leasetime(file, buf, size); 761 mutex_unlock(&nfsd_mutex); 762 return rv; 763 } 764 765 extern char *nfs4_recoverydir(void); 766 767 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size) 768 { 769 char *mesg = buf; 770 char *recdir; 771 int len, status; 772 773 if (size > 0) { 774 if (nfsd_serv) 775 return -EBUSY; 776 if (size > PATH_MAX || buf[size-1] != '\n') 777 return -EINVAL; 778 buf[size-1] = 0; 779 780 recdir = mesg; 781 len = qword_get(&mesg, recdir, size); 782 if (len <= 0) 783 return -EINVAL; 784 785 status = nfs4_reset_recoverydir(recdir); 786 } 787 sprintf(buf, "%s\n", nfs4_recoverydir()); 788 return strlen(buf); 789 } 790 791 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 792 { 793 ssize_t rv; 794 795 mutex_lock(&nfsd_mutex); 796 rv = __write_recoverydir(file, buf, size); 797 mutex_unlock(&nfsd_mutex); 798 return rv; 799 } 800 801 #endif 802 803 /*----------------------------------------------------------------------------*/ 804 /* 805 * populating the filesystem. 806 */ 807 808 static int nfsd_fill_super(struct super_block * sb, void * data, int silent) 809 { 810 static struct tree_descr nfsd_files[] = { 811 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR}, 812 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR}, 813 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR}, 814 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR}, 815 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR}, 816 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR}, 817 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR}, 818 [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, 819 [NFSD_FO_UnlockIP] = {"unlock_ip", 820 &transaction_ops, S_IWUSR|S_IRUSR}, 821 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 822 &transaction_ops, S_IWUSR|S_IRUSR}, 823 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 824 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 825 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 826 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 827 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 828 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 829 #ifdef CONFIG_NFSD_V4 830 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 831 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 832 #endif 833 /* last one */ {""} 834 }; 835 return simple_fill_super(sb, 0x6e667364, nfsd_files); 836 } 837 838 static int nfsd_get_sb(struct file_system_type *fs_type, 839 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 840 { 841 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt); 842 } 843 844 static struct file_system_type nfsd_fs_type = { 845 .owner = THIS_MODULE, 846 .name = "nfsd", 847 .get_sb = nfsd_get_sb, 848 .kill_sb = kill_litter_super, 849 }; 850 851 #ifdef CONFIG_PROC_FS 852 static int create_proc_exports_entry(void) 853 { 854 struct proc_dir_entry *entry; 855 856 entry = proc_mkdir("fs/nfs", NULL); 857 if (!entry) 858 return -ENOMEM; 859 entry = proc_create("exports", 0, entry, &exports_operations); 860 if (!entry) 861 return -ENOMEM; 862 return 0; 863 } 864 #else /* CONFIG_PROC_FS */ 865 static int create_proc_exports_entry(void) 866 { 867 return 0; 868 } 869 #endif 870 871 static int __init init_nfsd(void) 872 { 873 int retval; 874 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); 875 876 retval = nfs4_state_init(); /* nfs4 locking state */ 877 if (retval) 878 return retval; 879 nfsd_stat_init(); /* Statistics */ 880 retval = nfsd_reply_cache_init(); 881 if (retval) 882 goto out_free_stat; 883 retval = nfsd_export_init(); 884 if (retval) 885 goto out_free_cache; 886 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 887 retval = nfsd_idmap_init(); 888 if (retval) 889 goto out_free_lockd; 890 retval = create_proc_exports_entry(); 891 if (retval) 892 goto out_free_idmap; 893 retval = register_filesystem(&nfsd_fs_type); 894 if (retval) 895 goto out_free_all; 896 return 0; 897 out_free_all: 898 remove_proc_entry("fs/nfs/exports", NULL); 899 remove_proc_entry("fs/nfs", NULL); 900 out_free_idmap: 901 nfsd_idmap_shutdown(); 902 out_free_lockd: 903 nfsd_lockd_shutdown(); 904 nfsd_export_shutdown(); 905 out_free_cache: 906 nfsd_reply_cache_shutdown(); 907 out_free_stat: 908 nfsd_stat_shutdown(); 909 nfsd4_free_slabs(); 910 return retval; 911 } 912 913 static void __exit exit_nfsd(void) 914 { 915 nfsd_export_shutdown(); 916 nfsd_reply_cache_shutdown(); 917 remove_proc_entry("fs/nfs/exports", NULL); 918 remove_proc_entry("fs/nfs", NULL); 919 nfsd_stat_shutdown(); 920 nfsd_lockd_shutdown(); 921 nfsd_idmap_shutdown(); 922 nfsd4_free_slabs(); 923 unregister_filesystem(&nfsd_fs_type); 924 } 925 926 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 927 MODULE_LICENSE("GPL"); 928 module_init(init_nfsd) 929 module_exit(exit_nfsd) 930