1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Syscall interface to knfsd. 4 * 5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 6 */ 7 8 #include <linux/slab.h> 9 #include <linux/namei.h> 10 #include <linux/ctype.h> 11 #include <linux/fs_context.h> 12 13 #include <linux/sunrpc/svcsock.h> 14 #include <linux/lockd/lockd.h> 15 #include <linux/sunrpc/addr.h> 16 #include <linux/sunrpc/gss_api.h> 17 #include <linux/sunrpc/rpc_pipe_fs.h> 18 #include <linux/module.h> 19 #include <linux/fsnotify.h> 20 21 #include "idmap.h" 22 #include "nfsd.h" 23 #include "cache.h" 24 #include "state.h" 25 #include "netns.h" 26 #include "pnfs.h" 27 #include "filecache.h" 28 #include "trace.h" 29 30 /* 31 * We have a single directory with several nodes in it. 32 */ 33 enum { 34 NFSD_Root = 1, 35 NFSD_List, 36 NFSD_Export_Stats, 37 NFSD_Export_features, 38 NFSD_Fh, 39 NFSD_FO_UnlockIP, 40 NFSD_FO_UnlockFS, 41 NFSD_Threads, 42 NFSD_Pool_Threads, 43 NFSD_Pool_Stats, 44 NFSD_Reply_Cache_Stats, 45 NFSD_Versions, 46 NFSD_Ports, 47 NFSD_MaxBlkSize, 48 NFSD_MaxConnections, 49 NFSD_Filecache, 50 /* 51 * The below MUST come last. Otherwise we leave a hole in nfsd_files[] 52 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops 53 */ 54 #ifdef CONFIG_NFSD_V4 55 NFSD_Leasetime, 56 NFSD_Gracetime, 57 NFSD_RecoveryDir, 58 NFSD_V4EndGrace, 59 #endif 60 NFSD_MaxReserved 61 }; 62 63 /* 64 * write() for these nodes. 65 */ 66 static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 67 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); 68 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); 69 static ssize_t write_threads(struct file *file, char *buf, size_t size); 70 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 71 static ssize_t write_versions(struct file *file, char *buf, size_t size); 72 static ssize_t write_ports(struct file *file, char *buf, size_t size); 73 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 74 static ssize_t write_maxconn(struct file *file, char *buf, size_t size); 75 #ifdef CONFIG_NFSD_V4 76 static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 77 static ssize_t write_gracetime(struct file *file, char *buf, size_t size); 78 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 79 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size); 80 #endif 81 82 static ssize_t (*const write_op[])(struct file *, char *, size_t) = { 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 [NFSD_MaxConnections] = write_maxconn, 92 #ifdef CONFIG_NFSD_V4 93 [NFSD_Leasetime] = write_leasetime, 94 [NFSD_Gracetime] = write_gracetime, 95 [NFSD_RecoveryDir] = write_recoverydir, 96 [NFSD_V4EndGrace] = write_v4_end_grace, 97 #endif 98 }; 99 100 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 101 { 102 ino_t ino = file_inode(file)->i_ino; 103 char *data; 104 ssize_t rv; 105 106 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 107 return -EINVAL; 108 109 data = simple_transaction_get(file, buf, size); 110 if (IS_ERR(data)) 111 return PTR_ERR(data); 112 113 rv = write_op[ino](file, data, size); 114 if (rv < 0) 115 return rv; 116 117 simple_transaction_set(file, rv); 118 return size; 119 } 120 121 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) 122 { 123 if (! file->private_data) { 124 /* An attempt to read a transaction file without writing 125 * causes a 0-byte write so that the file can return 126 * state information 127 */ 128 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); 129 if (rv < 0) 130 return rv; 131 } 132 return simple_transaction_read(file, buf, size, pos); 133 } 134 135 static const struct file_operations transaction_ops = { 136 .write = nfsctl_transaction_write, 137 .read = nfsctl_transaction_read, 138 .release = simple_transaction_release, 139 .llseek = default_llseek, 140 }; 141 142 static int exports_net_open(struct net *net, struct file *file) 143 { 144 int err; 145 struct seq_file *seq; 146 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 147 148 err = seq_open(file, &nfs_exports_op); 149 if (err) 150 return err; 151 152 seq = file->private_data; 153 seq->private = nn->svc_export_cache; 154 return 0; 155 } 156 157 static int exports_nfsd_open(struct inode *inode, struct file *file) 158 { 159 return exports_net_open(inode->i_sb->s_fs_info, file); 160 } 161 162 static const struct file_operations exports_nfsd_operations = { 163 .open = exports_nfsd_open, 164 .read = seq_read, 165 .llseek = seq_lseek, 166 .release = seq_release, 167 }; 168 169 static int export_features_show(struct seq_file *m, void *v) 170 { 171 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS); 172 return 0; 173 } 174 175 DEFINE_SHOW_ATTRIBUTE(export_features); 176 177 static const struct file_operations pool_stats_operations = { 178 .open = nfsd_pool_stats_open, 179 .read = seq_read, 180 .llseek = seq_lseek, 181 .release = nfsd_pool_stats_release, 182 }; 183 184 DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats); 185 186 DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats); 187 188 /*----------------------------------------------------------------------------*/ 189 /* 190 * payload - write methods 191 */ 192 193 static inline struct net *netns(struct file *file) 194 { 195 return file_inode(file)->i_sb->s_fs_info; 196 } 197 198 /* 199 * write_unlock_ip - Release all locks used by a client 200 * 201 * Experimental. 202 * 203 * Input: 204 * buf: '\n'-terminated C string containing a 205 * presentation format IP address 206 * size: length of C string in @buf 207 * Output: 208 * On success: returns zero if all specified locks were released; 209 * returns one if one or more locks were not released 210 * On error: return code is negative errno value 211 */ 212 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) 213 { 214 struct sockaddr_storage address; 215 struct sockaddr *sap = (struct sockaddr *)&address; 216 size_t salen = sizeof(address); 217 char *fo_path; 218 struct net *net = netns(file); 219 220 /* sanity check */ 221 if (size == 0) 222 return -EINVAL; 223 224 if (buf[size-1] != '\n') 225 return -EINVAL; 226 227 fo_path = buf; 228 if (qword_get(&buf, fo_path, size) < 0) 229 return -EINVAL; 230 231 if (rpc_pton(net, fo_path, size, sap, salen) == 0) 232 return -EINVAL; 233 234 trace_nfsd_ctl_unlock_ip(net, buf); 235 return nlmsvc_unlock_all_by_ip(sap); 236 } 237 238 /* 239 * write_unlock_fs - Release all locks on a local file system 240 * 241 * Experimental. 242 * 243 * Input: 244 * buf: '\n'-terminated C string containing the 245 * absolute pathname of a local file system 246 * size: length of C string in @buf 247 * Output: 248 * On success: returns zero if all specified locks were released; 249 * returns one if one or more locks were not released 250 * On error: return code is negative errno value 251 */ 252 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size) 253 { 254 struct path path; 255 char *fo_path; 256 int error; 257 258 /* sanity check */ 259 if (size == 0) 260 return -EINVAL; 261 262 if (buf[size-1] != '\n') 263 return -EINVAL; 264 265 fo_path = buf; 266 if (qword_get(&buf, fo_path, size) < 0) 267 return -EINVAL; 268 trace_nfsd_ctl_unlock_fs(netns(file), fo_path); 269 error = kern_path(fo_path, 0, &path); 270 if (error) 271 return error; 272 273 /* 274 * XXX: Needs better sanity checking. Otherwise we could end up 275 * releasing locks on the wrong file system. 276 * 277 * For example: 278 * 1. Does the path refer to a directory? 279 * 2. Is that directory a mount point, or 280 * 3. Is that directory the root of an exported file system? 281 */ 282 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb); 283 284 path_put(&path); 285 return error; 286 } 287 288 /* 289 * write_filehandle - Get a variable-length NFS file handle by path 290 * 291 * On input, the buffer contains a '\n'-terminated C string comprised of 292 * three alphanumeric words separated by whitespace. The string may 293 * contain escape sequences. 294 * 295 * Input: 296 * buf: 297 * domain: client domain name 298 * path: export pathname 299 * maxsize: numeric maximum size of 300 * @buf 301 * size: length of C string in @buf 302 * Output: 303 * On success: passed-in buffer filled with '\n'-terminated C 304 * string containing a ASCII hex text version 305 * of the NFS file handle; 306 * return code is the size in bytes of the string 307 * On error: return code is negative errno value 308 */ 309 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 310 { 311 char *dname, *path; 312 int maxsize; 313 char *mesg = buf; 314 int len; 315 struct auth_domain *dom; 316 struct knfsd_fh fh; 317 318 if (size == 0) 319 return -EINVAL; 320 321 if (buf[size-1] != '\n') 322 return -EINVAL; 323 buf[size-1] = 0; 324 325 dname = mesg; 326 len = qword_get(&mesg, dname, size); 327 if (len <= 0) 328 return -EINVAL; 329 330 path = dname+len+1; 331 len = qword_get(&mesg, path, size); 332 if (len <= 0) 333 return -EINVAL; 334 335 len = get_int(&mesg, &maxsize); 336 if (len) 337 return len; 338 339 if (maxsize < NFS_FHSIZE) 340 return -EINVAL; 341 maxsize = min(maxsize, NFS3_FHSIZE); 342 343 if (qword_get(&mesg, mesg, size) > 0) 344 return -EINVAL; 345 346 trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize); 347 348 /* we have all the words, they are in buf.. */ 349 dom = unix_domain_find(dname); 350 if (!dom) 351 return -ENOMEM; 352 353 len = exp_rootfh(netns(file), dom, path, &fh, maxsize); 354 auth_domain_put(dom); 355 if (len) 356 return len; 357 358 mesg = buf; 359 len = SIMPLE_TRANSACTION_LIMIT; 360 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size); 361 mesg[-1] = '\n'; 362 return mesg - buf; 363 } 364 365 /* 366 * write_threads - Start NFSD, or report the current number of running threads 367 * 368 * Input: 369 * buf: ignored 370 * size: zero 371 * Output: 372 * On success: passed-in buffer filled with '\n'-terminated C 373 * string numeric value representing the number of 374 * running NFSD threads; 375 * return code is the size in bytes of the string 376 * On error: return code is zero 377 * 378 * OR 379 * 380 * Input: 381 * buf: C string containing an unsigned 382 * integer value representing the 383 * number of NFSD threads to start 384 * size: non-zero length of C string in @buf 385 * Output: 386 * On success: NFS service is started; 387 * passed-in buffer filled with '\n'-terminated C 388 * string numeric value representing the number of 389 * running NFSD threads; 390 * return code is the size in bytes of the string 391 * On error: return code is zero or a negative errno value 392 */ 393 static ssize_t write_threads(struct file *file, char *buf, size_t size) 394 { 395 char *mesg = buf; 396 int rv; 397 struct net *net = netns(file); 398 399 if (size > 0) { 400 int newthreads; 401 rv = get_int(&mesg, &newthreads); 402 if (rv) 403 return rv; 404 if (newthreads < 0) 405 return -EINVAL; 406 trace_nfsd_ctl_threads(net, newthreads); 407 rv = nfsd_svc(newthreads, net, file->f_cred); 408 if (rv < 0) 409 return rv; 410 } else 411 rv = nfsd_nrthreads(net); 412 413 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); 414 } 415 416 /* 417 * write_pool_threads - Set or report the current number of threads per pool 418 * 419 * Input: 420 * buf: ignored 421 * size: zero 422 * 423 * OR 424 * 425 * Input: 426 * buf: C string containing whitespace- 427 * separated unsigned integer values 428 * representing the number of NFSD 429 * threads to start in each pool 430 * size: non-zero length of C string in @buf 431 * Output: 432 * On success: passed-in buffer filled with '\n'-terminated C 433 * string containing integer values representing the 434 * number of NFSD threads in each pool; 435 * return code is the size in bytes of the string 436 * On error: return code is zero or a negative errno value 437 */ 438 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 439 { 440 /* if size > 0, look for an array of number of threads per node 441 * and apply them then write out number of threads per node as reply 442 */ 443 char *mesg = buf; 444 int i; 445 int rv; 446 int len; 447 int npools; 448 int *nthreads; 449 struct net *net = netns(file); 450 451 mutex_lock(&nfsd_mutex); 452 npools = nfsd_nrpools(net); 453 if (npools == 0) { 454 /* 455 * NFS is shut down. The admin can start it by 456 * writing to the threads file but NOT the pool_threads 457 * file, sorry. Report zero threads. 458 */ 459 mutex_unlock(&nfsd_mutex); 460 strcpy(buf, "0\n"); 461 return strlen(buf); 462 } 463 464 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); 465 rv = -ENOMEM; 466 if (nthreads == NULL) 467 goto out_free; 468 469 if (size > 0) { 470 for (i = 0; i < npools; i++) { 471 rv = get_int(&mesg, &nthreads[i]); 472 if (rv == -ENOENT) 473 break; /* fewer numbers than pools */ 474 if (rv) 475 goto out_free; /* syntax error */ 476 rv = -EINVAL; 477 if (nthreads[i] < 0) 478 goto out_free; 479 trace_nfsd_ctl_pool_threads(net, i, nthreads[i]); 480 } 481 rv = nfsd_set_nrthreads(i, nthreads, net); 482 if (rv) 483 goto out_free; 484 } 485 486 rv = nfsd_get_nrthreads(npools, nthreads, net); 487 if (rv) 488 goto out_free; 489 490 mesg = buf; 491 size = SIMPLE_TRANSACTION_LIMIT; 492 for (i = 0; i < npools && size > 0; i++) { 493 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 494 len = strlen(mesg); 495 size -= len; 496 mesg += len; 497 } 498 rv = mesg - buf; 499 out_free: 500 kfree(nthreads); 501 mutex_unlock(&nfsd_mutex); 502 return rv; 503 } 504 505 static ssize_t 506 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining, 507 const char *sep, unsigned vers, int minor) 508 { 509 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u"; 510 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST); 511 512 if (vers == 4 && minor >= 0 && 513 !nfsd_minorversion(nn, minor, NFSD_TEST)) 514 supported = false; 515 if (minor == 0 && supported) 516 /* 517 * special case for backward compatability. 518 * +4.0 is never reported, it is implied by 519 * +4, unless -4.0 is present. 520 */ 521 return 0; 522 return snprintf(buf, remaining, format, sep, 523 supported ? '+' : '-', vers, minor); 524 } 525 526 static ssize_t __write_versions(struct file *file, char *buf, size_t size) 527 { 528 char *mesg = buf; 529 char *vers, *minorp, sign; 530 int len, num, remaining; 531 ssize_t tlen = 0; 532 char *sep; 533 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 534 535 if (size > 0) { 536 if (nn->nfsd_serv) 537 /* Cannot change versions without updating 538 * nn->nfsd_serv->sv_xdrsize, and reallocing 539 * rq_argp and rq_resp 540 */ 541 return -EBUSY; 542 if (buf[size-1] != '\n') 543 return -EINVAL; 544 buf[size-1] = 0; 545 trace_nfsd_ctl_version(netns(file), buf); 546 547 vers = mesg; 548 len = qword_get(&mesg, vers, size); 549 if (len <= 0) return -EINVAL; 550 do { 551 enum vers_op cmd; 552 unsigned minor; 553 sign = *vers; 554 if (sign == '+' || sign == '-') 555 num = simple_strtol((vers+1), &minorp, 0); 556 else 557 num = simple_strtol(vers, &minorp, 0); 558 if (*minorp == '.') { 559 if (num != 4) 560 return -EINVAL; 561 if (kstrtouint(minorp+1, 0, &minor) < 0) 562 return -EINVAL; 563 } 564 565 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET; 566 switch(num) { 567 #ifdef CONFIG_NFSD_V2 568 case 2: 569 #endif 570 case 3: 571 nfsd_vers(nn, num, cmd); 572 break; 573 case 4: 574 if (*minorp == '.') { 575 if (nfsd_minorversion(nn, minor, cmd) < 0) 576 return -EINVAL; 577 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) { 578 /* 579 * Either we have +4 and no minors are enabled, 580 * or we have -4 and at least one minor is enabled. 581 * In either case, propagate 'cmd' to all minors. 582 */ 583 minor = 0; 584 while (nfsd_minorversion(nn, minor, cmd) >= 0) 585 minor++; 586 } 587 break; 588 default: 589 /* Ignore requests to disable non-existent versions */ 590 if (cmd == NFSD_SET) 591 return -EINVAL; 592 } 593 vers += len + 1; 594 } while ((len = qword_get(&mesg, vers, size)) > 0); 595 /* If all get turned off, turn them back on, as 596 * having no versions is BAD 597 */ 598 nfsd_reset_versions(nn); 599 } 600 601 /* Now write current state into reply buffer */ 602 sep = ""; 603 remaining = SIMPLE_TRANSACTION_LIMIT; 604 for (num=2 ; num <= 4 ; num++) { 605 int minor; 606 if (!nfsd_vers(nn, num, NFSD_AVAIL)) 607 continue; 608 609 minor = -1; 610 do { 611 len = nfsd_print_version_support(nn, buf, remaining, 612 sep, num, minor); 613 if (len >= remaining) 614 goto out; 615 remaining -= len; 616 buf += len; 617 tlen += len; 618 minor++; 619 if (len) 620 sep = " "; 621 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION); 622 } 623 out: 624 len = snprintf(buf, remaining, "\n"); 625 if (len >= remaining) 626 return -EINVAL; 627 return tlen + len; 628 } 629 630 /* 631 * write_versions - Set or report the available NFS protocol versions 632 * 633 * Input: 634 * buf: ignored 635 * size: zero 636 * Output: 637 * On success: passed-in buffer filled with '\n'-terminated C 638 * string containing positive or negative integer 639 * values representing the current status of each 640 * protocol version; 641 * return code is the size in bytes of the string 642 * On error: return code is zero or a negative errno value 643 * 644 * OR 645 * 646 * Input: 647 * buf: C string containing whitespace- 648 * separated positive or negative 649 * integer values representing NFS 650 * protocol versions to enable ("+n") 651 * or disable ("-n") 652 * size: non-zero length of C string in @buf 653 * Output: 654 * On success: status of zero or more protocol versions has 655 * been updated; passed-in buffer filled with 656 * '\n'-terminated C string containing positive 657 * or negative integer values representing the 658 * current status of each protocol version; 659 * return code is the size in bytes of the string 660 * On error: return code is zero or a negative errno value 661 */ 662 static ssize_t write_versions(struct file *file, char *buf, size_t size) 663 { 664 ssize_t rv; 665 666 mutex_lock(&nfsd_mutex); 667 rv = __write_versions(file, buf, size); 668 mutex_unlock(&nfsd_mutex); 669 return rv; 670 } 671 672 /* 673 * Zero-length write. Return a list of NFSD's current listener 674 * transports. 675 */ 676 static ssize_t __write_ports_names(char *buf, struct net *net) 677 { 678 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 679 680 if (nn->nfsd_serv == NULL) 681 return 0; 682 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); 683 } 684 685 /* 686 * A single 'fd' number was written, in which case it must be for 687 * a socket of a supported family/protocol, and we use it as an 688 * nfsd listener. 689 */ 690 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred) 691 { 692 char *mesg = buf; 693 int fd, err; 694 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 695 696 err = get_int(&mesg, &fd); 697 if (err != 0 || fd < 0) 698 return -EINVAL; 699 trace_nfsd_ctl_ports_addfd(net, fd); 700 701 err = nfsd_create_serv(net); 702 if (err != 0) 703 return err; 704 705 err = svc_addsock(nn->nfsd_serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred); 706 707 if (err >= 0 && 708 !nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1)) 709 svc_get(nn->nfsd_serv); 710 711 nfsd_put(net); 712 return err; 713 } 714 715 /* 716 * A transport listener is added by writing its transport name and 717 * a port number. 718 */ 719 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred) 720 { 721 char transport[16]; 722 struct svc_xprt *xprt; 723 int port, err; 724 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 725 726 if (sscanf(buf, "%15s %5u", transport, &port) != 2) 727 return -EINVAL; 728 729 if (port < 1 || port > USHRT_MAX) 730 return -EINVAL; 731 trace_nfsd_ctl_ports_addxprt(net, transport, port); 732 733 err = nfsd_create_serv(net); 734 if (err != 0) 735 return err; 736 737 err = svc_xprt_create(nn->nfsd_serv, transport, net, 738 PF_INET, port, SVC_SOCK_ANONYMOUS, cred); 739 if (err < 0) 740 goto out_err; 741 742 err = svc_xprt_create(nn->nfsd_serv, transport, net, 743 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred); 744 if (err < 0 && err != -EAFNOSUPPORT) 745 goto out_close; 746 747 if (!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1)) 748 svc_get(nn->nfsd_serv); 749 750 nfsd_put(net); 751 return 0; 752 out_close: 753 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port); 754 if (xprt != NULL) { 755 svc_xprt_close(xprt); 756 svc_xprt_put(xprt); 757 } 758 out_err: 759 nfsd_put(net); 760 return err; 761 } 762 763 static ssize_t __write_ports(struct file *file, char *buf, size_t size, 764 struct net *net) 765 { 766 if (size == 0) 767 return __write_ports_names(buf, net); 768 769 if (isdigit(buf[0])) 770 return __write_ports_addfd(buf, net, file->f_cred); 771 772 if (isalpha(buf[0])) 773 return __write_ports_addxprt(buf, net, file->f_cred); 774 775 return -EINVAL; 776 } 777 778 /* 779 * write_ports - Pass a socket file descriptor or transport name to listen on 780 * 781 * Input: 782 * buf: ignored 783 * size: zero 784 * Output: 785 * On success: passed-in buffer filled with a '\n'-terminated C 786 * string containing a whitespace-separated list of 787 * named NFSD listeners; 788 * return code is the size in bytes of the string 789 * On error: return code is zero or a negative errno value 790 * 791 * OR 792 * 793 * Input: 794 * buf: C string containing an unsigned 795 * integer value representing a bound 796 * but unconnected socket that is to be 797 * used as an NFSD listener; listen(3) 798 * must be called for a SOCK_STREAM 799 * socket, otherwise it is ignored 800 * size: non-zero length of C string in @buf 801 * Output: 802 * On success: NFS service is started; 803 * passed-in buffer filled with a '\n'-terminated C 804 * string containing a unique alphanumeric name of 805 * the listener; 806 * return code is the size in bytes of the string 807 * On error: return code is a negative errno value 808 * 809 * OR 810 * 811 * Input: 812 * buf: C string containing a transport 813 * name and an unsigned integer value 814 * representing the port to listen on, 815 * separated by whitespace 816 * size: non-zero length of C string in @buf 817 * Output: 818 * On success: returns zero; NFS service is started 819 * On error: return code is a negative errno value 820 */ 821 static ssize_t write_ports(struct file *file, char *buf, size_t size) 822 { 823 ssize_t rv; 824 825 mutex_lock(&nfsd_mutex); 826 rv = __write_ports(file, buf, size, netns(file)); 827 mutex_unlock(&nfsd_mutex); 828 return rv; 829 } 830 831 832 int nfsd_max_blksize; 833 834 /* 835 * write_maxblksize - Set or report the current NFS blksize 836 * 837 * Input: 838 * buf: ignored 839 * size: zero 840 * 841 * OR 842 * 843 * Input: 844 * buf: C string containing an unsigned 845 * integer value representing the new 846 * NFS blksize 847 * size: non-zero length of C string in @buf 848 * Output: 849 * On success: passed-in buffer filled with '\n'-terminated C string 850 * containing numeric value of the current NFS blksize 851 * setting; 852 * return code is the size in bytes of the string 853 * On error: return code is zero or a negative errno value 854 */ 855 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 856 { 857 char *mesg = buf; 858 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 859 860 if (size > 0) { 861 int bsize; 862 int rv = get_int(&mesg, &bsize); 863 if (rv) 864 return rv; 865 trace_nfsd_ctl_maxblksize(netns(file), bsize); 866 867 /* force bsize into allowed range and 868 * required alignment. 869 */ 870 bsize = max_t(int, bsize, 1024); 871 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE); 872 bsize &= ~(1024-1); 873 mutex_lock(&nfsd_mutex); 874 if (nn->nfsd_serv) { 875 mutex_unlock(&nfsd_mutex); 876 return -EBUSY; 877 } 878 nfsd_max_blksize = bsize; 879 mutex_unlock(&nfsd_mutex); 880 } 881 882 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 883 nfsd_max_blksize); 884 } 885 886 /* 887 * write_maxconn - Set or report the current max number of connections 888 * 889 * Input: 890 * buf: ignored 891 * size: zero 892 * OR 893 * 894 * Input: 895 * buf: C string containing an unsigned 896 * integer value representing the new 897 * number of max connections 898 * size: non-zero length of C string in @buf 899 * Output: 900 * On success: passed-in buffer filled with '\n'-terminated C string 901 * containing numeric value of max_connections setting 902 * for this net namespace; 903 * return code is the size in bytes of the string 904 * On error: return code is zero or a negative errno value 905 */ 906 static ssize_t write_maxconn(struct file *file, char *buf, size_t size) 907 { 908 char *mesg = buf; 909 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 910 unsigned int maxconn = nn->max_connections; 911 912 if (size > 0) { 913 int rv = get_uint(&mesg, &maxconn); 914 915 if (rv) 916 return rv; 917 trace_nfsd_ctl_maxconn(netns(file), maxconn); 918 nn->max_connections = maxconn; 919 } 920 921 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn); 922 } 923 924 #ifdef CONFIG_NFSD_V4 925 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, 926 time64_t *time, struct nfsd_net *nn) 927 { 928 struct dentry *dentry = file_dentry(file); 929 char *mesg = buf; 930 int rv, i; 931 932 if (size > 0) { 933 if (nn->nfsd_serv) 934 return -EBUSY; 935 rv = get_int(&mesg, &i); 936 if (rv) 937 return rv; 938 trace_nfsd_ctl_time(netns(file), dentry->d_name.name, 939 dentry->d_name.len, i); 940 941 /* 942 * Some sanity checking. We don't have a reason for 943 * these particular numbers, but problems with the 944 * extremes are: 945 * - Too short: the briefest network outage may 946 * cause clients to lose all their locks. Also, 947 * the frequent polling may be wasteful. 948 * - Too long: do you really want reboot recovery 949 * to take more than an hour? Or to make other 950 * clients wait an hour before being able to 951 * revoke a dead client's locks? 952 */ 953 if (i < 10 || i > 3600) 954 return -EINVAL; 955 *time = i; 956 } 957 958 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time); 959 } 960 961 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, 962 time64_t *time, struct nfsd_net *nn) 963 { 964 ssize_t rv; 965 966 mutex_lock(&nfsd_mutex); 967 rv = __nfsd4_write_time(file, buf, size, time, nn); 968 mutex_unlock(&nfsd_mutex); 969 return rv; 970 } 971 972 /* 973 * write_leasetime - Set or report the current NFSv4 lease time 974 * 975 * Input: 976 * buf: ignored 977 * size: zero 978 * 979 * OR 980 * 981 * Input: 982 * buf: C string containing an unsigned 983 * integer value representing the new 984 * NFSv4 lease expiry time 985 * size: non-zero length of C string in @buf 986 * Output: 987 * On success: passed-in buffer filled with '\n'-terminated C 988 * string containing unsigned integer value of the 989 * current lease expiry time; 990 * return code is the size in bytes of the string 991 * On error: return code is zero or a negative errno value 992 */ 993 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 994 { 995 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 996 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn); 997 } 998 999 /* 1000 * write_gracetime - Set or report current NFSv4 grace period time 1001 * 1002 * As above, but sets the time of the NFSv4 grace period. 1003 * 1004 * Note this should never be set to less than the *previous* 1005 * lease-period time, but we don't try to enforce this. (In the common 1006 * case (a new boot), we don't know what the previous lease time was 1007 * anyway.) 1008 */ 1009 static ssize_t write_gracetime(struct file *file, char *buf, size_t size) 1010 { 1011 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1012 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn); 1013 } 1014 1015 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size, 1016 struct nfsd_net *nn) 1017 { 1018 char *mesg = buf; 1019 char *recdir; 1020 int len, status; 1021 1022 if (size > 0) { 1023 if (nn->nfsd_serv) 1024 return -EBUSY; 1025 if (size > PATH_MAX || buf[size-1] != '\n') 1026 return -EINVAL; 1027 buf[size-1] = 0; 1028 1029 recdir = mesg; 1030 len = qword_get(&mesg, recdir, size); 1031 if (len <= 0) 1032 return -EINVAL; 1033 trace_nfsd_ctl_recoverydir(netns(file), recdir); 1034 1035 status = nfs4_reset_recoverydir(recdir); 1036 if (status) 1037 return status; 1038 } 1039 1040 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 1041 nfs4_recoverydir()); 1042 } 1043 1044 /* 1045 * write_recoverydir - Set or report the pathname of the recovery directory 1046 * 1047 * Input: 1048 * buf: ignored 1049 * size: zero 1050 * 1051 * OR 1052 * 1053 * Input: 1054 * buf: C string containing the pathname 1055 * of the directory on a local file 1056 * system containing permanent NFSv4 1057 * recovery data 1058 * size: non-zero length of C string in @buf 1059 * Output: 1060 * On success: passed-in buffer filled with '\n'-terminated C string 1061 * containing the current recovery pathname setting; 1062 * return code is the size in bytes of the string 1063 * On error: return code is zero or a negative errno value 1064 */ 1065 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1066 { 1067 ssize_t rv; 1068 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1069 1070 mutex_lock(&nfsd_mutex); 1071 rv = __write_recoverydir(file, buf, size, nn); 1072 mutex_unlock(&nfsd_mutex); 1073 return rv; 1074 } 1075 1076 /* 1077 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager 1078 * 1079 * Input: 1080 * buf: ignored 1081 * size: zero 1082 * OR 1083 * 1084 * Input: 1085 * buf: any value 1086 * size: non-zero length of C string in @buf 1087 * Output: 1088 * passed-in buffer filled with "Y" or "N" with a newline 1089 * and NULL-terminated C string. This indicates whether 1090 * the grace period has ended in the current net 1091 * namespace. Return code is the size in bytes of the 1092 * string. Writing a string that starts with 'Y', 'y', or 1093 * '1' to the file will end the grace period for nfsd's v4 1094 * lock manager. 1095 */ 1096 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size) 1097 { 1098 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1099 1100 if (size > 0) { 1101 switch(buf[0]) { 1102 case 'Y': 1103 case 'y': 1104 case '1': 1105 if (!nn->nfsd_serv) 1106 return -EBUSY; 1107 trace_nfsd_end_grace(netns(file)); 1108 break; 1109 default: 1110 return -EINVAL; 1111 } 1112 } 1113 1114 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n", 1115 nn->grace_ended ? 'Y' : 'N'); 1116 } 1117 1118 #endif 1119 1120 /*----------------------------------------------------------------------------*/ 1121 /* 1122 * populating the filesystem. 1123 */ 1124 1125 /* Basically copying rpc_get_inode. */ 1126 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode) 1127 { 1128 struct inode *inode = new_inode(sb); 1129 if (!inode) 1130 return NULL; 1131 /* Following advice from simple_fill_super documentation: */ 1132 inode->i_ino = iunique(sb, NFSD_MaxReserved); 1133 inode->i_mode = mode; 1134 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 1135 switch (mode & S_IFMT) { 1136 case S_IFDIR: 1137 inode->i_fop = &simple_dir_operations; 1138 inode->i_op = &simple_dir_inode_operations; 1139 inc_nlink(inode); 1140 break; 1141 case S_IFLNK: 1142 inode->i_op = &simple_symlink_inode_operations; 1143 break; 1144 default: 1145 break; 1146 } 1147 return inode; 1148 } 1149 1150 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl) 1151 { 1152 struct inode *inode; 1153 1154 inode = nfsd_get_inode(dir->i_sb, mode); 1155 if (!inode) 1156 return -ENOMEM; 1157 if (ncl) { 1158 inode->i_private = ncl; 1159 kref_get(&ncl->cl_ref); 1160 } 1161 d_add(dentry, inode); 1162 inc_nlink(dir); 1163 fsnotify_mkdir(dir, dentry); 1164 return 0; 1165 } 1166 1167 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name) 1168 { 1169 struct inode *dir = parent->d_inode; 1170 struct dentry *dentry; 1171 int ret = -ENOMEM; 1172 1173 inode_lock(dir); 1174 dentry = d_alloc_name(parent, name); 1175 if (!dentry) 1176 goto out_err; 1177 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl); 1178 if (ret) 1179 goto out_err; 1180 out: 1181 inode_unlock(dir); 1182 return dentry; 1183 out_err: 1184 dput(dentry); 1185 dentry = ERR_PTR(ret); 1186 goto out; 1187 } 1188 1189 #if IS_ENABLED(CONFIG_SUNRPC_GSS) 1190 static int __nfsd_symlink(struct inode *dir, struct dentry *dentry, 1191 umode_t mode, const char *content) 1192 { 1193 struct inode *inode; 1194 1195 inode = nfsd_get_inode(dir->i_sb, mode); 1196 if (!inode) 1197 return -ENOMEM; 1198 1199 inode->i_link = (char *)content; 1200 inode->i_size = strlen(content); 1201 1202 d_add(dentry, inode); 1203 inc_nlink(dir); 1204 fsnotify_create(dir, dentry); 1205 return 0; 1206 } 1207 1208 /* 1209 * @content is assumed to be a NUL-terminated string that lives 1210 * longer than the symlink itself. 1211 */ 1212 static void _nfsd_symlink(struct dentry *parent, const char *name, 1213 const char *content) 1214 { 1215 struct inode *dir = parent->d_inode; 1216 struct dentry *dentry; 1217 int ret; 1218 1219 inode_lock(dir); 1220 dentry = d_alloc_name(parent, name); 1221 if (!dentry) 1222 goto out; 1223 ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content); 1224 if (ret) 1225 dput(dentry); 1226 out: 1227 inode_unlock(dir); 1228 } 1229 #else 1230 static inline void _nfsd_symlink(struct dentry *parent, const char *name, 1231 const char *content) 1232 { 1233 } 1234 1235 #endif 1236 1237 static void clear_ncl(struct inode *inode) 1238 { 1239 struct nfsdfs_client *ncl = inode->i_private; 1240 1241 inode->i_private = NULL; 1242 kref_put(&ncl->cl_ref, ncl->cl_release); 1243 } 1244 1245 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode) 1246 { 1247 struct nfsdfs_client *nc = inode->i_private; 1248 1249 if (nc) 1250 kref_get(&nc->cl_ref); 1251 return nc; 1252 } 1253 1254 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode) 1255 { 1256 struct nfsdfs_client *nc; 1257 1258 inode_lock_shared(inode); 1259 nc = __get_nfsdfs_client(inode); 1260 inode_unlock_shared(inode); 1261 return nc; 1262 } 1263 /* from __rpc_unlink */ 1264 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry) 1265 { 1266 int ret; 1267 1268 clear_ncl(d_inode(dentry)); 1269 dget(dentry); 1270 ret = simple_unlink(dir, dentry); 1271 d_drop(dentry); 1272 fsnotify_unlink(dir, dentry); 1273 dput(dentry); 1274 WARN_ON_ONCE(ret); 1275 } 1276 1277 static void nfsdfs_remove_files(struct dentry *root) 1278 { 1279 struct dentry *dentry, *tmp; 1280 1281 list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) { 1282 if (!simple_positive(dentry)) { 1283 WARN_ON_ONCE(1); /* I think this can't happen? */ 1284 continue; 1285 } 1286 nfsdfs_remove_file(d_inode(root), dentry); 1287 } 1288 } 1289 1290 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share 1291 * code instead. */ 1292 static int nfsdfs_create_files(struct dentry *root, 1293 const struct tree_descr *files, 1294 struct dentry **fdentries) 1295 { 1296 struct inode *dir = d_inode(root); 1297 struct inode *inode; 1298 struct dentry *dentry; 1299 int i; 1300 1301 inode_lock(dir); 1302 for (i = 0; files->name && files->name[0]; i++, files++) { 1303 dentry = d_alloc_name(root, files->name); 1304 if (!dentry) 1305 goto out; 1306 inode = nfsd_get_inode(d_inode(root)->i_sb, 1307 S_IFREG | files->mode); 1308 if (!inode) { 1309 dput(dentry); 1310 goto out; 1311 } 1312 inode->i_fop = files->ops; 1313 inode->i_private = __get_nfsdfs_client(dir); 1314 d_add(dentry, inode); 1315 fsnotify_create(dir, dentry); 1316 if (fdentries) 1317 fdentries[i] = dentry; 1318 } 1319 inode_unlock(dir); 1320 return 0; 1321 out: 1322 nfsdfs_remove_files(root); 1323 inode_unlock(dir); 1324 return -ENOMEM; 1325 } 1326 1327 /* on success, returns positive number unique to that client. */ 1328 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn, 1329 struct nfsdfs_client *ncl, u32 id, 1330 const struct tree_descr *files, 1331 struct dentry **fdentries) 1332 { 1333 struct dentry *dentry; 1334 char name[11]; 1335 int ret; 1336 1337 sprintf(name, "%u", id); 1338 1339 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name); 1340 if (IS_ERR(dentry)) /* XXX: tossing errors? */ 1341 return NULL; 1342 ret = nfsdfs_create_files(dentry, files, fdentries); 1343 if (ret) { 1344 nfsd_client_rmdir(dentry); 1345 return NULL; 1346 } 1347 return dentry; 1348 } 1349 1350 /* Taken from __rpc_rmdir: */ 1351 void nfsd_client_rmdir(struct dentry *dentry) 1352 { 1353 struct inode *dir = d_inode(dentry->d_parent); 1354 struct inode *inode = d_inode(dentry); 1355 int ret; 1356 1357 inode_lock(dir); 1358 nfsdfs_remove_files(dentry); 1359 clear_ncl(inode); 1360 dget(dentry); 1361 ret = simple_rmdir(dir, dentry); 1362 WARN_ON_ONCE(ret); 1363 d_drop(dentry); 1364 fsnotify_rmdir(dir, dentry); 1365 dput(dentry); 1366 inode_unlock(dir); 1367 } 1368 1369 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc) 1370 { 1371 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 1372 nfsd_net_id); 1373 struct dentry *dentry; 1374 int ret; 1375 1376 static const struct tree_descr nfsd_files[] = { 1377 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO}, 1378 /* Per-export io stats use same ops as exports file */ 1379 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO}, 1380 [NFSD_Export_features] = {"export_features", 1381 &export_features_fops, S_IRUGO}, 1382 [NFSD_FO_UnlockIP] = {"unlock_ip", 1383 &transaction_ops, S_IWUSR|S_IRUSR}, 1384 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1385 &transaction_ops, S_IWUSR|S_IRUSR}, 1386 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1387 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1388 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1389 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1390 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", 1391 &nfsd_reply_cache_stats_fops, S_IRUGO}, 1392 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1393 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1394 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1395 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO}, 1396 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO}, 1397 #ifdef CONFIG_NFSD_V4 1398 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1399 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1400 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1401 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO}, 1402 #endif 1403 /* last one */ {""} 1404 }; 1405 1406 ret = simple_fill_super(sb, 0x6e667364, nfsd_files); 1407 if (ret) 1408 return ret; 1409 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes", 1410 "/proc/net/rpc/gss_krb5_enctypes"); 1411 dentry = nfsd_mkdir(sb->s_root, NULL, "clients"); 1412 if (IS_ERR(dentry)) 1413 return PTR_ERR(dentry); 1414 nn->nfsd_client_dir = dentry; 1415 return 0; 1416 } 1417 1418 static int nfsd_fs_get_tree(struct fs_context *fc) 1419 { 1420 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns)); 1421 } 1422 1423 static void nfsd_fs_free_fc(struct fs_context *fc) 1424 { 1425 if (fc->s_fs_info) 1426 put_net(fc->s_fs_info); 1427 } 1428 1429 static const struct fs_context_operations nfsd_fs_context_ops = { 1430 .free = nfsd_fs_free_fc, 1431 .get_tree = nfsd_fs_get_tree, 1432 }; 1433 1434 static int nfsd_init_fs_context(struct fs_context *fc) 1435 { 1436 put_user_ns(fc->user_ns); 1437 fc->user_ns = get_user_ns(fc->net_ns->user_ns); 1438 fc->ops = &nfsd_fs_context_ops; 1439 return 0; 1440 } 1441 1442 static void nfsd_umount(struct super_block *sb) 1443 { 1444 struct net *net = sb->s_fs_info; 1445 1446 nfsd_shutdown_threads(net); 1447 1448 kill_litter_super(sb); 1449 put_net(net); 1450 } 1451 1452 static struct file_system_type nfsd_fs_type = { 1453 .owner = THIS_MODULE, 1454 .name = "nfsd", 1455 .init_fs_context = nfsd_init_fs_context, 1456 .kill_sb = nfsd_umount, 1457 }; 1458 MODULE_ALIAS_FS("nfsd"); 1459 1460 #ifdef CONFIG_PROC_FS 1461 1462 static int exports_proc_open(struct inode *inode, struct file *file) 1463 { 1464 return exports_net_open(current->nsproxy->net_ns, file); 1465 } 1466 1467 static const struct proc_ops exports_proc_ops = { 1468 .proc_open = exports_proc_open, 1469 .proc_read = seq_read, 1470 .proc_lseek = seq_lseek, 1471 .proc_release = seq_release, 1472 }; 1473 1474 static int create_proc_exports_entry(void) 1475 { 1476 struct proc_dir_entry *entry; 1477 1478 entry = proc_mkdir("fs/nfs", NULL); 1479 if (!entry) 1480 return -ENOMEM; 1481 entry = proc_create("exports", 0, entry, &exports_proc_ops); 1482 if (!entry) { 1483 remove_proc_entry("fs/nfs", NULL); 1484 return -ENOMEM; 1485 } 1486 return 0; 1487 } 1488 #else /* CONFIG_PROC_FS */ 1489 static int create_proc_exports_entry(void) 1490 { 1491 return 0; 1492 } 1493 #endif 1494 1495 unsigned int nfsd_net_id; 1496 1497 /** 1498 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace 1499 * @net: a freshly-created network namespace 1500 * 1501 * This information stays around as long as the network namespace is 1502 * alive whether or not there is an NFSD instance running in the 1503 * namespace. 1504 * 1505 * Returns zero on success, or a negative errno otherwise. 1506 */ 1507 static __net_init int nfsd_net_init(struct net *net) 1508 { 1509 int retval; 1510 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1511 1512 retval = nfsd_export_init(net); 1513 if (retval) 1514 goto out_export_error; 1515 retval = nfsd_idmap_init(net); 1516 if (retval) 1517 goto out_idmap_error; 1518 retval = nfsd_net_reply_cache_init(nn); 1519 if (retval) 1520 goto out_repcache_error; 1521 nn->nfsd_versions = NULL; 1522 nn->nfsd4_minorversions = NULL; 1523 nfsd4_init_leases_net(nn); 1524 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key)); 1525 seqlock_init(&nn->writeverf_lock); 1526 1527 return 0; 1528 1529 out_repcache_error: 1530 nfsd_idmap_shutdown(net); 1531 out_idmap_error: 1532 nfsd_export_shutdown(net); 1533 out_export_error: 1534 return retval; 1535 } 1536 1537 /** 1538 * nfsd_net_exit - Release the nfsd_net portion of a net namespace 1539 * @net: a network namespace that is about to be destroyed 1540 * 1541 */ 1542 static __net_exit void nfsd_net_exit(struct net *net) 1543 { 1544 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1545 1546 nfsd_net_reply_cache_destroy(nn); 1547 nfsd_idmap_shutdown(net); 1548 nfsd_export_shutdown(net); 1549 nfsd_netns_free_versions(nn); 1550 } 1551 1552 static struct pernet_operations nfsd_net_ops = { 1553 .init = nfsd_net_init, 1554 .exit = nfsd_net_exit, 1555 .id = &nfsd_net_id, 1556 .size = sizeof(struct nfsd_net), 1557 }; 1558 1559 static int __init init_nfsd(void) 1560 { 1561 int retval; 1562 1563 retval = nfsd4_init_slabs(); 1564 if (retval) 1565 return retval; 1566 retval = nfsd4_init_pnfs(); 1567 if (retval) 1568 goto out_free_slabs; 1569 retval = nfsd_stat_init(); /* Statistics */ 1570 if (retval) 1571 goto out_free_pnfs; 1572 retval = nfsd_drc_slab_create(); 1573 if (retval) 1574 goto out_free_stat; 1575 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 1576 retval = create_proc_exports_entry(); 1577 if (retval) 1578 goto out_free_lockd; 1579 retval = register_pernet_subsys(&nfsd_net_ops); 1580 if (retval < 0) 1581 goto out_free_exports; 1582 retval = register_cld_notifier(); 1583 if (retval) 1584 goto out_free_subsys; 1585 retval = nfsd4_create_laundry_wq(); 1586 if (retval) 1587 goto out_free_cld; 1588 retval = register_filesystem(&nfsd_fs_type); 1589 if (retval) 1590 goto out_free_all; 1591 return 0; 1592 out_free_all: 1593 nfsd4_destroy_laundry_wq(); 1594 out_free_cld: 1595 unregister_cld_notifier(); 1596 out_free_subsys: 1597 unregister_pernet_subsys(&nfsd_net_ops); 1598 out_free_exports: 1599 remove_proc_entry("fs/nfs/exports", NULL); 1600 remove_proc_entry("fs/nfs", NULL); 1601 out_free_lockd: 1602 nfsd_lockd_shutdown(); 1603 nfsd_drc_slab_free(); 1604 out_free_stat: 1605 nfsd_stat_shutdown(); 1606 out_free_pnfs: 1607 nfsd4_exit_pnfs(); 1608 out_free_slabs: 1609 nfsd4_free_slabs(); 1610 return retval; 1611 } 1612 1613 static void __exit exit_nfsd(void) 1614 { 1615 unregister_filesystem(&nfsd_fs_type); 1616 nfsd4_destroy_laundry_wq(); 1617 unregister_cld_notifier(); 1618 unregister_pernet_subsys(&nfsd_net_ops); 1619 nfsd_drc_slab_free(); 1620 remove_proc_entry("fs/nfs/exports", NULL); 1621 remove_proc_entry("fs/nfs", NULL); 1622 nfsd_stat_shutdown(); 1623 nfsd_lockd_shutdown(); 1624 nfsd4_free_slabs(); 1625 nfsd4_exit_pnfs(); 1626 } 1627 1628 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1629 MODULE_LICENSE("GPL"); 1630 module_init(init_nfsd) 1631 module_exit(exit_nfsd) 1632