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/namei.h> 16 #include <linux/fcntl.h> 17 #include <linux/net.h> 18 #include <linux/in.h> 19 #include <linux/syscalls.h> 20 #include <linux/unistd.h> 21 #include <linux/slab.h> 22 #include <linux/proc_fs.h> 23 #include <linux/seq_file.h> 24 #include <linux/pagemap.h> 25 #include <linux/init.h> 26 #include <linux/inet.h> 27 #include <linux/string.h> 28 #include <linux/smp_lock.h> 29 #include <linux/ctype.h> 30 31 #include <linux/nfs.h> 32 #include <linux/nfsd_idmap.h> 33 #include <linux/lockd/bind.h> 34 #include <linux/sunrpc/svc.h> 35 #include <linux/sunrpc/svcsock.h> 36 #include <linux/nfsd/nfsd.h> 37 #include <linux/nfsd/cache.h> 38 #include <linux/nfsd/xdr.h> 39 #include <linux/nfsd/syscall.h> 40 #include <linux/lockd/lockd.h> 41 42 #include <asm/uaccess.h> 43 #include <net/ipv6.h> 44 45 /* 46 * We have a single directory with 9 nodes in it. 47 */ 48 enum { 49 NFSD_Root = 1, 50 NFSD_Svc, 51 NFSD_Add, 52 NFSD_Del, 53 NFSD_Export, 54 NFSD_Unexport, 55 NFSD_Getfd, 56 NFSD_Getfs, 57 NFSD_List, 58 NFSD_Fh, 59 NFSD_FO_UnlockIP, 60 NFSD_FO_UnlockFS, 61 NFSD_Threads, 62 NFSD_Pool_Threads, 63 NFSD_Versions, 64 NFSD_Ports, 65 NFSD_MaxBlkSize, 66 /* 67 * The below MUST come last. Otherwise we leave a hole in nfsd_files[] 68 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops 69 */ 70 #ifdef CONFIG_NFSD_V4 71 NFSD_Leasetime, 72 NFSD_RecoveryDir, 73 #endif 74 }; 75 76 /* 77 * write() for these nodes. 78 */ 79 static ssize_t write_svc(struct file *file, char *buf, size_t size); 80 static ssize_t write_add(struct file *file, char *buf, size_t size); 81 static ssize_t write_del(struct file *file, char *buf, size_t size); 82 static ssize_t write_export(struct file *file, char *buf, size_t size); 83 static ssize_t write_unexport(struct file *file, char *buf, size_t size); 84 static ssize_t write_getfd(struct file *file, char *buf, size_t size); 85 static ssize_t write_getfs(struct file *file, char *buf, size_t size); 86 static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 87 static ssize_t write_threads(struct file *file, char *buf, size_t size); 88 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 89 static ssize_t write_versions(struct file *file, char *buf, size_t size); 90 static ssize_t write_ports(struct file *file, char *buf, size_t size); 91 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 92 #ifdef CONFIG_NFSD_V4 93 static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 94 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 95 #endif 96 97 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size); 98 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size); 99 100 static ssize_t (*write_op[])(struct file *, char *, size_t) = { 101 [NFSD_Svc] = write_svc, 102 [NFSD_Add] = write_add, 103 [NFSD_Del] = write_del, 104 [NFSD_Export] = write_export, 105 [NFSD_Unexport] = write_unexport, 106 [NFSD_Getfd] = write_getfd, 107 [NFSD_Getfs] = write_getfs, 108 [NFSD_Fh] = write_filehandle, 109 [NFSD_FO_UnlockIP] = failover_unlock_ip, 110 [NFSD_FO_UnlockFS] = failover_unlock_fs, 111 [NFSD_Threads] = write_threads, 112 [NFSD_Pool_Threads] = write_pool_threads, 113 [NFSD_Versions] = write_versions, 114 [NFSD_Ports] = write_ports, 115 [NFSD_MaxBlkSize] = write_maxblksize, 116 #ifdef CONFIG_NFSD_V4 117 [NFSD_Leasetime] = write_leasetime, 118 [NFSD_RecoveryDir] = write_recoverydir, 119 #endif 120 }; 121 122 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 123 { 124 ino_t ino = file->f_path.dentry->d_inode->i_ino; 125 char *data; 126 ssize_t rv; 127 128 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 129 return -EINVAL; 130 131 data = simple_transaction_get(file, buf, size); 132 if (IS_ERR(data)) 133 return PTR_ERR(data); 134 135 rv = write_op[ino](file, data, size); 136 if (rv >= 0) { 137 simple_transaction_set(file, rv); 138 rv = size; 139 } 140 return rv; 141 } 142 143 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) 144 { 145 if (! file->private_data) { 146 /* An attempt to read a transaction file without writing 147 * causes a 0-byte write so that the file can return 148 * state information 149 */ 150 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); 151 if (rv < 0) 152 return rv; 153 } 154 return simple_transaction_read(file, buf, size, pos); 155 } 156 157 static const struct file_operations transaction_ops = { 158 .write = nfsctl_transaction_write, 159 .read = nfsctl_transaction_read, 160 .release = simple_transaction_release, 161 }; 162 163 static int exports_open(struct inode *inode, struct file *file) 164 { 165 return seq_open(file, &nfs_exports_op); 166 } 167 168 static const struct file_operations exports_operations = { 169 .open = exports_open, 170 .read = seq_read, 171 .llseek = seq_lseek, 172 .release = seq_release, 173 .owner = THIS_MODULE, 174 }; 175 176 /*----------------------------------------------------------------------------*/ 177 /* 178 * payload - write methods 179 * If the method has a response, the response should be put in buf, 180 * and the length returned. Otherwise return 0 or and -error. 181 */ 182 183 static ssize_t write_svc(struct file *file, char *buf, size_t size) 184 { 185 struct nfsctl_svc *data; 186 if (size < sizeof(*data)) 187 return -EINVAL; 188 data = (struct nfsctl_svc*) buf; 189 return nfsd_svc(data->svc_port, data->svc_nthreads); 190 } 191 192 static ssize_t write_add(struct file *file, char *buf, size_t size) 193 { 194 struct nfsctl_client *data; 195 if (size < sizeof(*data)) 196 return -EINVAL; 197 data = (struct nfsctl_client *)buf; 198 return exp_addclient(data); 199 } 200 201 static ssize_t write_del(struct file *file, char *buf, size_t size) 202 { 203 struct nfsctl_client *data; 204 if (size < sizeof(*data)) 205 return -EINVAL; 206 data = (struct nfsctl_client *)buf; 207 return exp_delclient(data); 208 } 209 210 static ssize_t write_export(struct file *file, char *buf, size_t size) 211 { 212 struct nfsctl_export *data; 213 if (size < sizeof(*data)) 214 return -EINVAL; 215 data = (struct nfsctl_export*)buf; 216 return exp_export(data); 217 } 218 219 static ssize_t write_unexport(struct file *file, char *buf, size_t size) 220 { 221 struct nfsctl_export *data; 222 223 if (size < sizeof(*data)) 224 return -EINVAL; 225 data = (struct nfsctl_export*)buf; 226 return exp_unexport(data); 227 } 228 229 static ssize_t write_getfs(struct file *file, char *buf, size_t size) 230 { 231 struct nfsctl_fsparm *data; 232 struct sockaddr_in *sin; 233 struct auth_domain *clp; 234 int err = 0; 235 struct knfsd_fh *res; 236 struct in6_addr in6; 237 238 if (size < sizeof(*data)) 239 return -EINVAL; 240 data = (struct nfsctl_fsparm*)buf; 241 err = -EPROTONOSUPPORT; 242 if (data->gd_addr.sa_family != AF_INET) 243 goto out; 244 sin = (struct sockaddr_in *)&data->gd_addr; 245 if (data->gd_maxlen > NFS3_FHSIZE) 246 data->gd_maxlen = NFS3_FHSIZE; 247 248 res = (struct knfsd_fh*)buf; 249 250 exp_readlock(); 251 252 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6); 253 254 clp = auth_unix_lookup(&in6); 255 if (!clp) 256 err = -EPERM; 257 else { 258 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen); 259 auth_domain_put(clp); 260 } 261 exp_readunlock(); 262 if (err == 0) 263 err = res->fh_size + offsetof(struct knfsd_fh, fh_base); 264 out: 265 return err; 266 } 267 268 static ssize_t write_getfd(struct file *file, char *buf, size_t size) 269 { 270 struct nfsctl_fdparm *data; 271 struct sockaddr_in *sin; 272 struct auth_domain *clp; 273 int err = 0; 274 struct knfsd_fh fh; 275 char *res; 276 struct in6_addr in6; 277 278 if (size < sizeof(*data)) 279 return -EINVAL; 280 data = (struct nfsctl_fdparm*)buf; 281 err = -EPROTONOSUPPORT; 282 if (data->gd_addr.sa_family != AF_INET) 283 goto out; 284 err = -EINVAL; 285 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS) 286 goto out; 287 288 res = buf; 289 sin = (struct sockaddr_in *)&data->gd_addr; 290 exp_readlock(); 291 292 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6); 293 294 clp = auth_unix_lookup(&in6); 295 if (!clp) 296 err = -EPERM; 297 else { 298 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE); 299 auth_domain_put(clp); 300 } 301 exp_readunlock(); 302 303 if (err == 0) { 304 memset(res,0, NFS_FHSIZE); 305 memcpy(res, &fh.fh_base, fh.fh_size); 306 err = NFS_FHSIZE; 307 } 308 out: 309 return err; 310 } 311 312 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size) 313 { 314 struct sockaddr_in sin = { 315 .sin_family = AF_INET, 316 }; 317 int b1, b2, b3, b4; 318 char c; 319 char *fo_path; 320 321 /* sanity check */ 322 if (size == 0) 323 return -EINVAL; 324 325 if (buf[size-1] != '\n') 326 return -EINVAL; 327 328 fo_path = buf; 329 if (qword_get(&buf, fo_path, size) < 0) 330 return -EINVAL; 331 332 /* get ipv4 address */ 333 if (sscanf(fo_path, NIPQUAD_FMT "%c", &b1, &b2, &b3, &b4, &c) != 4) 334 return -EINVAL; 335 if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255) 336 return -EINVAL; 337 sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4); 338 339 return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin); 340 } 341 342 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size) 343 { 344 struct nameidata nd; 345 char *fo_path; 346 int error; 347 348 /* sanity check */ 349 if (size == 0) 350 return -EINVAL; 351 352 if (buf[size-1] != '\n') 353 return -EINVAL; 354 355 fo_path = buf; 356 if (qword_get(&buf, fo_path, size) < 0) 357 return -EINVAL; 358 359 error = path_lookup(fo_path, 0, &nd); 360 if (error) 361 return error; 362 363 error = nlmsvc_unlock_all_by_sb(nd.path.mnt->mnt_sb); 364 365 path_put(&nd.path); 366 return error; 367 } 368 369 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 370 { 371 /* request is: 372 * domain path maxsize 373 * response is 374 * filehandle 375 * 376 * qword quoting is used, so filehandle will be \x.... 377 */ 378 char *dname, *path; 379 int uninitialized_var(maxsize); 380 char *mesg = buf; 381 int len; 382 struct auth_domain *dom; 383 struct knfsd_fh fh; 384 385 if (size == 0) 386 return -EINVAL; 387 388 if (buf[size-1] != '\n') 389 return -EINVAL; 390 buf[size-1] = 0; 391 392 dname = mesg; 393 len = qword_get(&mesg, dname, size); 394 if (len <= 0) return -EINVAL; 395 396 path = dname+len+1; 397 len = qword_get(&mesg, path, size); 398 if (len <= 0) return -EINVAL; 399 400 len = get_int(&mesg, &maxsize); 401 if (len) 402 return len; 403 404 if (maxsize < NFS_FHSIZE) 405 return -EINVAL; 406 if (maxsize > NFS3_FHSIZE) 407 maxsize = NFS3_FHSIZE; 408 409 if (qword_get(&mesg, mesg, size)>0) 410 return -EINVAL; 411 412 /* we have all the words, they are in buf.. */ 413 dom = unix_domain_find(dname); 414 if (!dom) 415 return -ENOMEM; 416 417 len = exp_rootfh(dom, path, &fh, maxsize); 418 auth_domain_put(dom); 419 if (len) 420 return len; 421 422 mesg = buf; len = SIMPLE_TRANSACTION_LIMIT; 423 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); 424 mesg[-1] = '\n'; 425 return mesg - buf; 426 } 427 428 static ssize_t write_threads(struct file *file, char *buf, size_t size) 429 { 430 /* if size > 0, look for a number of threads and call nfsd_svc 431 * then write out number of threads as reply 432 */ 433 char *mesg = buf; 434 int rv; 435 if (size > 0) { 436 int newthreads; 437 rv = get_int(&mesg, &newthreads); 438 if (rv) 439 return rv; 440 if (newthreads <0) 441 return -EINVAL; 442 rv = nfsd_svc(2049, newthreads); 443 if (rv) 444 return rv; 445 } 446 sprintf(buf, "%d\n", nfsd_nrthreads()); 447 return strlen(buf); 448 } 449 450 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 451 { 452 /* if size > 0, look for an array of number of threads per node 453 * and apply them then write out number of threads per node as reply 454 */ 455 char *mesg = buf; 456 int i; 457 int rv; 458 int len; 459 int npools; 460 int *nthreads; 461 462 mutex_lock(&nfsd_mutex); 463 npools = nfsd_nrpools(); 464 if (npools == 0) { 465 /* 466 * NFS is shut down. The admin can start it by 467 * writing to the threads file but NOT the pool_threads 468 * file, sorry. Report zero threads. 469 */ 470 mutex_unlock(&nfsd_mutex); 471 strcpy(buf, "0\n"); 472 return strlen(buf); 473 } 474 475 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); 476 rv = -ENOMEM; 477 if (nthreads == NULL) 478 goto out_free; 479 480 if (size > 0) { 481 for (i = 0; i < npools; i++) { 482 rv = get_int(&mesg, &nthreads[i]); 483 if (rv == -ENOENT) 484 break; /* fewer numbers than pools */ 485 if (rv) 486 goto out_free; /* syntax error */ 487 rv = -EINVAL; 488 if (nthreads[i] < 0) 489 goto out_free; 490 } 491 rv = nfsd_set_nrthreads(i, nthreads); 492 if (rv) 493 goto out_free; 494 } 495 496 rv = nfsd_get_nrthreads(npools, nthreads); 497 if (rv) 498 goto out_free; 499 500 mesg = buf; 501 size = SIMPLE_TRANSACTION_LIMIT; 502 for (i = 0; i < npools && size > 0; i++) { 503 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 504 len = strlen(mesg); 505 size -= len; 506 mesg += len; 507 } 508 509 mutex_unlock(&nfsd_mutex); 510 return (mesg-buf); 511 512 out_free: 513 kfree(nthreads); 514 mutex_unlock(&nfsd_mutex); 515 return rv; 516 } 517 518 static ssize_t __write_versions(struct file *file, char *buf, size_t size) 519 { 520 /* 521 * Format: 522 * [-/+]vers [-/+]vers ... 523 */ 524 char *mesg = buf; 525 char *vers, sign; 526 int len, num; 527 ssize_t tlen = 0; 528 char *sep; 529 530 if (size>0) { 531 if (nfsd_serv) 532 /* Cannot change versions without updating 533 * nfsd_serv->sv_xdrsize, and reallocing 534 * rq_argp and rq_resp 535 */ 536 return -EBUSY; 537 if (buf[size-1] != '\n') 538 return -EINVAL; 539 buf[size-1] = 0; 540 541 vers = mesg; 542 len = qword_get(&mesg, vers, size); 543 if (len <= 0) return -EINVAL; 544 do { 545 sign = *vers; 546 if (sign == '+' || sign == '-') 547 num = simple_strtol((vers+1), NULL, 0); 548 else 549 num = simple_strtol(vers, NULL, 0); 550 switch(num) { 551 case 2: 552 case 3: 553 case 4: 554 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET); 555 break; 556 default: 557 return -EINVAL; 558 } 559 vers += len + 1; 560 tlen += len; 561 } while ((len = qword_get(&mesg, vers, size)) > 0); 562 /* If all get turned off, turn them back on, as 563 * having no versions is BAD 564 */ 565 nfsd_reset_versions(); 566 } 567 /* Now write current state into reply buffer */ 568 len = 0; 569 sep = ""; 570 for (num=2 ; num <= 4 ; num++) 571 if (nfsd_vers(num, NFSD_AVAIL)) { 572 len += sprintf(buf+len, "%s%c%d", sep, 573 nfsd_vers(num, NFSD_TEST)?'+':'-', 574 num); 575 sep = " "; 576 } 577 len += sprintf(buf+len, "\n"); 578 return len; 579 } 580 581 static ssize_t write_versions(struct file *file, char *buf, size_t size) 582 { 583 ssize_t rv; 584 585 mutex_lock(&nfsd_mutex); 586 rv = __write_versions(file, buf, size); 587 mutex_unlock(&nfsd_mutex); 588 return rv; 589 } 590 591 static ssize_t __write_ports(struct file *file, char *buf, size_t size) 592 { 593 if (size == 0) { 594 int len = 0; 595 596 if (nfsd_serv) 597 len = svc_xprt_names(nfsd_serv, buf, 0); 598 return len; 599 } 600 /* Either a single 'fd' number is written, in which 601 * case it must be for a socket of a supported family/protocol, 602 * and we use it as an nfsd socket, or 603 * A '-' followed by the 'name' of a socket in which case 604 * we close the socket. 605 */ 606 if (isdigit(buf[0])) { 607 char *mesg = buf; 608 int fd; 609 int err; 610 err = get_int(&mesg, &fd); 611 if (err) 612 return -EINVAL; 613 if (fd < 0) 614 return -EINVAL; 615 err = nfsd_create_serv(); 616 if (!err) { 617 int proto = 0; 618 err = svc_addsock(nfsd_serv, fd, buf, &proto); 619 if (err >= 0) { 620 err = lockd_up(proto); 621 if (err < 0) 622 svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf); 623 } 624 /* Decrease the count, but don't shutdown the 625 * the service 626 */ 627 nfsd_serv->sv_nrthreads--; 628 } 629 return err < 0 ? err : 0; 630 } 631 if (buf[0] == '-' && isdigit(buf[1])) { 632 char *toclose = kstrdup(buf+1, GFP_KERNEL); 633 int len = 0; 634 if (!toclose) 635 return -ENOMEM; 636 if (nfsd_serv) 637 len = svc_sock_names(buf, nfsd_serv, toclose); 638 if (len >= 0) 639 lockd_down(); 640 kfree(toclose); 641 return len; 642 } 643 /* 644 * Add a transport listener by writing it's transport name 645 */ 646 if (isalpha(buf[0])) { 647 int err; 648 char transport[16]; 649 int port; 650 if (sscanf(buf, "%15s %4d", transport, &port) == 2) { 651 err = nfsd_create_serv(); 652 if (!err) { 653 err = svc_create_xprt(nfsd_serv, 654 transport, port, 655 SVC_SOCK_ANONYMOUS); 656 if (err == -ENOENT) 657 /* Give a reasonable perror msg for 658 * bad transport string */ 659 err = -EPROTONOSUPPORT; 660 } 661 return err < 0 ? err : 0; 662 } 663 } 664 /* 665 * Remove a transport by writing it's transport name and port number 666 */ 667 if (buf[0] == '-' && isalpha(buf[1])) { 668 struct svc_xprt *xprt; 669 int err = -EINVAL; 670 char transport[16]; 671 int port; 672 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) { 673 if (port == 0) 674 return -EINVAL; 675 if (nfsd_serv) { 676 xprt = svc_find_xprt(nfsd_serv, transport, 677 AF_UNSPEC, port); 678 if (xprt) { 679 svc_close_xprt(xprt); 680 svc_xprt_put(xprt); 681 err = 0; 682 } else 683 err = -ENOTCONN; 684 } 685 return err < 0 ? err : 0; 686 } 687 } 688 return -EINVAL; 689 } 690 691 static ssize_t write_ports(struct file *file, char *buf, size_t size) 692 { 693 ssize_t rv; 694 695 mutex_lock(&nfsd_mutex); 696 rv = __write_ports(file, buf, size); 697 mutex_unlock(&nfsd_mutex); 698 return rv; 699 } 700 701 702 int nfsd_max_blksize; 703 704 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 705 { 706 char *mesg = buf; 707 if (size > 0) { 708 int bsize; 709 int rv = get_int(&mesg, &bsize); 710 if (rv) 711 return rv; 712 /* force bsize into allowed range and 713 * required alignment. 714 */ 715 if (bsize < 1024) 716 bsize = 1024; 717 if (bsize > NFSSVC_MAXBLKSIZE) 718 bsize = NFSSVC_MAXBLKSIZE; 719 bsize &= ~(1024-1); 720 mutex_lock(&nfsd_mutex); 721 if (nfsd_serv && nfsd_serv->sv_nrthreads) { 722 mutex_unlock(&nfsd_mutex); 723 return -EBUSY; 724 } 725 nfsd_max_blksize = bsize; 726 mutex_unlock(&nfsd_mutex); 727 } 728 return sprintf(buf, "%d\n", nfsd_max_blksize); 729 } 730 731 #ifdef CONFIG_NFSD_V4 732 extern time_t nfs4_leasetime(void); 733 734 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size) 735 { 736 /* if size > 10 seconds, call 737 * nfs4_reset_lease() then write out the new lease (seconds) as reply 738 */ 739 char *mesg = buf; 740 int rv, lease; 741 742 if (size > 0) { 743 if (nfsd_serv) 744 return -EBUSY; 745 rv = get_int(&mesg, &lease); 746 if (rv) 747 return rv; 748 if (lease < 10 || lease > 3600) 749 return -EINVAL; 750 nfs4_reset_lease(lease); 751 } 752 sprintf(buf, "%ld\n", nfs4_lease_time()); 753 return strlen(buf); 754 } 755 756 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 757 { 758 ssize_t rv; 759 760 mutex_lock(&nfsd_mutex); 761 rv = __write_leasetime(file, buf, size); 762 mutex_unlock(&nfsd_mutex); 763 return rv; 764 } 765 766 extern char *nfs4_recoverydir(void); 767 768 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size) 769 { 770 char *mesg = buf; 771 char *recdir; 772 int len, status; 773 774 if (size > 0) { 775 if (nfsd_serv) 776 return -EBUSY; 777 if (size > PATH_MAX || buf[size-1] != '\n') 778 return -EINVAL; 779 buf[size-1] = 0; 780 781 recdir = mesg; 782 len = qword_get(&mesg, recdir, size); 783 if (len <= 0) 784 return -EINVAL; 785 786 status = nfs4_reset_recoverydir(recdir); 787 } 788 sprintf(buf, "%s\n", nfs4_recoverydir()); 789 return strlen(buf); 790 } 791 792 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 793 { 794 ssize_t rv; 795 796 mutex_lock(&nfsd_mutex); 797 rv = __write_recoverydir(file, buf, size); 798 mutex_unlock(&nfsd_mutex); 799 return rv; 800 } 801 802 #endif 803 804 /*----------------------------------------------------------------------------*/ 805 /* 806 * populating the filesystem. 807 */ 808 809 static int nfsd_fill_super(struct super_block * sb, void * data, int silent) 810 { 811 static struct tree_descr nfsd_files[] = { 812 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR}, 813 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR}, 814 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR}, 815 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR}, 816 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR}, 817 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR}, 818 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR}, 819 [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, 820 [NFSD_FO_UnlockIP] = {"unlock_ip", 821 &transaction_ops, S_IWUSR|S_IRUSR}, 822 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 823 &transaction_ops, S_IWUSR|S_IRUSR}, 824 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 825 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 826 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 827 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 828 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 829 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 830 #ifdef CONFIG_NFSD_V4 831 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 832 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 833 #endif 834 /* last one */ {""} 835 }; 836 return simple_fill_super(sb, 0x6e667364, nfsd_files); 837 } 838 839 static int nfsd_get_sb(struct file_system_type *fs_type, 840 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 841 { 842 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt); 843 } 844 845 static struct file_system_type nfsd_fs_type = { 846 .owner = THIS_MODULE, 847 .name = "nfsd", 848 .get_sb = nfsd_get_sb, 849 .kill_sb = kill_litter_super, 850 }; 851 852 #ifdef CONFIG_PROC_FS 853 static int create_proc_exports_entry(void) 854 { 855 struct proc_dir_entry *entry; 856 857 entry = proc_mkdir("fs/nfs", NULL); 858 if (!entry) 859 return -ENOMEM; 860 entry = proc_create("exports", 0, entry, &exports_operations); 861 if (!entry) 862 return -ENOMEM; 863 return 0; 864 } 865 #else /* CONFIG_PROC_FS */ 866 static int create_proc_exports_entry(void) 867 { 868 return 0; 869 } 870 #endif 871 872 static int __init init_nfsd(void) 873 { 874 int retval; 875 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); 876 877 retval = nfs4_state_init(); /* nfs4 locking state */ 878 if (retval) 879 return retval; 880 nfsd_stat_init(); /* Statistics */ 881 retval = nfsd_reply_cache_init(); 882 if (retval) 883 goto out_free_stat; 884 retval = nfsd_export_init(); 885 if (retval) 886 goto out_free_cache; 887 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 888 retval = nfsd_idmap_init(); 889 if (retval) 890 goto out_free_lockd; 891 retval = create_proc_exports_entry(); 892 if (retval) 893 goto out_free_idmap; 894 retval = register_filesystem(&nfsd_fs_type); 895 if (retval) 896 goto out_free_all; 897 return 0; 898 out_free_all: 899 remove_proc_entry("fs/nfs/exports", NULL); 900 remove_proc_entry("fs/nfs", NULL); 901 out_free_idmap: 902 nfsd_idmap_shutdown(); 903 out_free_lockd: 904 nfsd_lockd_shutdown(); 905 nfsd_export_shutdown(); 906 out_free_cache: 907 nfsd_reply_cache_shutdown(); 908 out_free_stat: 909 nfsd_stat_shutdown(); 910 nfsd4_free_slabs(); 911 return retval; 912 } 913 914 static void __exit exit_nfsd(void) 915 { 916 nfsd_export_shutdown(); 917 nfsd_reply_cache_shutdown(); 918 remove_proc_entry("fs/nfs/exports", NULL); 919 remove_proc_entry("fs/nfs", NULL); 920 nfsd_stat_shutdown(); 921 nfsd_lockd_shutdown(); 922 nfsd_idmap_shutdown(); 923 nfsd4_free_slabs(); 924 unregister_filesystem(&nfsd_fs_type); 925 } 926 927 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 928 MODULE_LICENSE("GPL"); 929 module_init(init_nfsd) 930 module_exit(exit_nfsd) 931