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 */ 33enum { 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 */ 66static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 67static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); 68static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); 69static ssize_t write_threads(struct file *file, char *buf, size_t size); 70static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 71static ssize_t write_versions(struct file *file, char *buf, size_t size); 72static ssize_t write_ports(struct file *file, char *buf, size_t size); 73static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 74static ssize_t write_maxconn(struct file *file, char *buf, size_t size); 75#ifdef CONFIG_NFSD_V4 76static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 77static ssize_t write_gracetime(struct file *file, char *buf, size_t size); 78static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 79static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size); 80#endif 81 82static 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 100static 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 121static 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 135static 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 142static 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 157static 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 162static 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 169static 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 175DEFINE_SHOW_ATTRIBUTE(export_features); 176 177static 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 184DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats); 185 186DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats); 187 188/*----------------------------------------------------------------------------*/ 189/* 190 * payload - write methods 191 */ 192 193static 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 */ 212static 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 */ 252static 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 */ 309static 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 */ 393static 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 */ 438static 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; 499out_free: 500 kfree(nthreads); 501 mutex_unlock(&nfsd_mutex); 502 return rv; 503} 504 505static ssize_t 506nfsd_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 526static 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 } 623out: 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 */ 662static 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 */ 676static 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 */ 690static 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 struct svc_serv *serv; 696 697 err = get_int(&mesg, &fd); 698 if (err != 0 || fd < 0) 699 return -EINVAL; 700 trace_nfsd_ctl_ports_addfd(net, fd); 701 702 err = nfsd_create_serv(net); 703 if (err != 0) 704 return err; 705 706 serv = nn->nfsd_serv; 707 err = svc_addsock(serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred); 708 709 if (err < 0 && !serv->sv_nrthreads && !nn->keep_active) 710 nfsd_last_thread(net); 711 else if (err >= 0 && !serv->sv_nrthreads && !xchg(&nn->keep_active, 1)) 712 svc_get(serv); 713 714 svc_put(serv); 715 return err; 716} 717 718/* 719 * A transport listener is added by writing its transport name and 720 * a port number. 721 */ 722static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred) 723{ 724 char transport[16]; 725 struct svc_xprt *xprt; 726 int port, err; 727 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 728 struct svc_serv *serv; 729 730 if (sscanf(buf, "%15s %5u", transport, &port) != 2) 731 return -EINVAL; 732 733 if (port < 1 || port > USHRT_MAX) 734 return -EINVAL; 735 trace_nfsd_ctl_ports_addxprt(net, transport, port); 736 737 err = nfsd_create_serv(net); 738 if (err != 0) 739 return err; 740 741 serv = nn->nfsd_serv; 742 err = svc_xprt_create(serv, transport, net, 743 PF_INET, port, SVC_SOCK_ANONYMOUS, cred); 744 if (err < 0) 745 goto out_err; 746 747 err = svc_xprt_create(serv, transport, net, 748 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred); 749 if (err < 0 && err != -EAFNOSUPPORT) 750 goto out_close; 751 752 if (!serv->sv_nrthreads && !xchg(&nn->keep_active, 1)) 753 svc_get(serv); 754 755 svc_put(serv); 756 return 0; 757out_close: 758 xprt = svc_find_xprt(serv, transport, net, PF_INET, port); 759 if (xprt != NULL) { 760 svc_xprt_close(xprt); 761 svc_xprt_put(xprt); 762 } 763out_err: 764 if (!serv->sv_nrthreads && !nn->keep_active) 765 nfsd_last_thread(net); 766 767 svc_put(serv); 768 return err; 769} 770 771static ssize_t __write_ports(struct file *file, char *buf, size_t size, 772 struct net *net) 773{ 774 if (size == 0) 775 return __write_ports_names(buf, net); 776 777 if (isdigit(buf[0])) 778 return __write_ports_addfd(buf, net, file->f_cred); 779 780 if (isalpha(buf[0])) 781 return __write_ports_addxprt(buf, net, file->f_cred); 782 783 return -EINVAL; 784} 785 786/* 787 * write_ports - Pass a socket file descriptor or transport name to listen on 788 * 789 * Input: 790 * buf: ignored 791 * size: zero 792 * Output: 793 * On success: passed-in buffer filled with a '\n'-terminated C 794 * string containing a whitespace-separated list of 795 * named NFSD listeners; 796 * return code is the size in bytes of the string 797 * On error: return code is zero or a negative errno value 798 * 799 * OR 800 * 801 * Input: 802 * buf: C string containing an unsigned 803 * integer value representing a bound 804 * but unconnected socket that is to be 805 * used as an NFSD listener; listen(3) 806 * must be called for a SOCK_STREAM 807 * socket, otherwise it is ignored 808 * size: non-zero length of C string in @buf 809 * Output: 810 * On success: NFS service is started; 811 * passed-in buffer filled with a '\n'-terminated C 812 * string containing a unique alphanumeric name of 813 * the listener; 814 * return code is the size in bytes of the string 815 * On error: return code is a negative errno value 816 * 817 * OR 818 * 819 * Input: 820 * buf: C string containing a transport 821 * name and an unsigned integer value 822 * representing the port to listen on, 823 * separated by whitespace 824 * size: non-zero length of C string in @buf 825 * Output: 826 * On success: returns zero; NFS service is started 827 * On error: return code is a negative errno value 828 */ 829static ssize_t write_ports(struct file *file, char *buf, size_t size) 830{ 831 ssize_t rv; 832 833 mutex_lock(&nfsd_mutex); 834 rv = __write_ports(file, buf, size, netns(file)); 835 mutex_unlock(&nfsd_mutex); 836 return rv; 837} 838 839 840int nfsd_max_blksize; 841 842/* 843 * write_maxblksize - Set or report the current NFS blksize 844 * 845 * Input: 846 * buf: ignored 847 * size: zero 848 * 849 * OR 850 * 851 * Input: 852 * buf: C string containing an unsigned 853 * integer value representing the new 854 * NFS blksize 855 * size: non-zero length of C string in @buf 856 * Output: 857 * On success: passed-in buffer filled with '\n'-terminated C string 858 * containing numeric value of the current NFS blksize 859 * setting; 860 * return code is the size in bytes of the string 861 * On error: return code is zero or a negative errno value 862 */ 863static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 864{ 865 char *mesg = buf; 866 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 867 868 if (size > 0) { 869 int bsize; 870 int rv = get_int(&mesg, &bsize); 871 if (rv) 872 return rv; 873 trace_nfsd_ctl_maxblksize(netns(file), bsize); 874 875 /* force bsize into allowed range and 876 * required alignment. 877 */ 878 bsize = max_t(int, bsize, 1024); 879 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE); 880 bsize &= ~(1024-1); 881 mutex_lock(&nfsd_mutex); 882 if (nn->nfsd_serv) { 883 mutex_unlock(&nfsd_mutex); 884 return -EBUSY; 885 } 886 nfsd_max_blksize = bsize; 887 mutex_unlock(&nfsd_mutex); 888 } 889 890 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 891 nfsd_max_blksize); 892} 893 894/* 895 * write_maxconn - Set or report the current max number of connections 896 * 897 * Input: 898 * buf: ignored 899 * size: zero 900 * OR 901 * 902 * Input: 903 * buf: C string containing an unsigned 904 * integer value representing the new 905 * number of max connections 906 * size: non-zero length of C string in @buf 907 * Output: 908 * On success: passed-in buffer filled with '\n'-terminated C string 909 * containing numeric value of max_connections setting 910 * for this net namespace; 911 * return code is the size in bytes of the string 912 * On error: return code is zero or a negative errno value 913 */ 914static ssize_t write_maxconn(struct file *file, char *buf, size_t size) 915{ 916 char *mesg = buf; 917 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 918 unsigned int maxconn = nn->max_connections; 919 920 if (size > 0) { 921 int rv = get_uint(&mesg, &maxconn); 922 923 if (rv) 924 return rv; 925 trace_nfsd_ctl_maxconn(netns(file), maxconn); 926 nn->max_connections = maxconn; 927 } 928 929 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn); 930} 931 932#ifdef CONFIG_NFSD_V4 933static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, 934 time64_t *time, struct nfsd_net *nn) 935{ 936 struct dentry *dentry = file_dentry(file); 937 char *mesg = buf; 938 int rv, i; 939 940 if (size > 0) { 941 if (nn->nfsd_serv) 942 return -EBUSY; 943 rv = get_int(&mesg, &i); 944 if (rv) 945 return rv; 946 trace_nfsd_ctl_time(netns(file), dentry->d_name.name, 947 dentry->d_name.len, i); 948 949 /* 950 * Some sanity checking. We don't have a reason for 951 * these particular numbers, but problems with the 952 * extremes are: 953 * - Too short: the briefest network outage may 954 * cause clients to lose all their locks. Also, 955 * the frequent polling may be wasteful. 956 * - Too long: do you really want reboot recovery 957 * to take more than an hour? Or to make other 958 * clients wait an hour before being able to 959 * revoke a dead client's locks? 960 */ 961 if (i < 10 || i > 3600) 962 return -EINVAL; 963 *time = i; 964 } 965 966 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time); 967} 968 969static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, 970 time64_t *time, struct nfsd_net *nn) 971{ 972 ssize_t rv; 973 974 mutex_lock(&nfsd_mutex); 975 rv = __nfsd4_write_time(file, buf, size, time, nn); 976 mutex_unlock(&nfsd_mutex); 977 return rv; 978} 979 980/* 981 * write_leasetime - Set or report the current NFSv4 lease time 982 * 983 * Input: 984 * buf: ignored 985 * size: zero 986 * 987 * OR 988 * 989 * Input: 990 * buf: C string containing an unsigned 991 * integer value representing the new 992 * NFSv4 lease expiry time 993 * size: non-zero length of C string in @buf 994 * Output: 995 * On success: passed-in buffer filled with '\n'-terminated C 996 * string containing unsigned integer value of the 997 * current lease expiry time; 998 * return code is the size in bytes of the string 999 * On error: return code is zero or a negative errno value 1000 */ 1001static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 1002{ 1003 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1004 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn); 1005} 1006 1007/* 1008 * write_gracetime - Set or report current NFSv4 grace period time 1009 * 1010 * As above, but sets the time of the NFSv4 grace period. 1011 * 1012 * Note this should never be set to less than the *previous* 1013 * lease-period time, but we don't try to enforce this. (In the common 1014 * case (a new boot), we don't know what the previous lease time was 1015 * anyway.) 1016 */ 1017static ssize_t write_gracetime(struct file *file, char *buf, size_t size) 1018{ 1019 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1020 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn); 1021} 1022 1023static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size, 1024 struct nfsd_net *nn) 1025{ 1026 char *mesg = buf; 1027 char *recdir; 1028 int len, status; 1029 1030 if (size > 0) { 1031 if (nn->nfsd_serv) 1032 return -EBUSY; 1033 if (size > PATH_MAX || buf[size-1] != '\n') 1034 return -EINVAL; 1035 buf[size-1] = 0; 1036 1037 recdir = mesg; 1038 len = qword_get(&mesg, recdir, size); 1039 if (len <= 0) 1040 return -EINVAL; 1041 trace_nfsd_ctl_recoverydir(netns(file), recdir); 1042 1043 status = nfs4_reset_recoverydir(recdir); 1044 if (status) 1045 return status; 1046 } 1047 1048 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 1049 nfs4_recoverydir()); 1050} 1051 1052/* 1053 * write_recoverydir - Set or report the pathname of the recovery directory 1054 * 1055 * Input: 1056 * buf: ignored 1057 * size: zero 1058 * 1059 * OR 1060 * 1061 * Input: 1062 * buf: C string containing the pathname 1063 * of the directory on a local file 1064 * system containing permanent NFSv4 1065 * recovery data 1066 * size: non-zero length of C string in @buf 1067 * Output: 1068 * On success: passed-in buffer filled with '\n'-terminated C string 1069 * containing the current recovery pathname setting; 1070 * return code is the size in bytes of the string 1071 * On error: return code is zero or a negative errno value 1072 */ 1073static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1074{ 1075 ssize_t rv; 1076 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1077 1078 mutex_lock(&nfsd_mutex); 1079 rv = __write_recoverydir(file, buf, size, nn); 1080 mutex_unlock(&nfsd_mutex); 1081 return rv; 1082} 1083 1084/* 1085 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager 1086 * 1087 * Input: 1088 * buf: ignored 1089 * size: zero 1090 * OR 1091 * 1092 * Input: 1093 * buf: any value 1094 * size: non-zero length of C string in @buf 1095 * Output: 1096 * passed-in buffer filled with "Y" or "N" with a newline 1097 * and NULL-terminated C string. This indicates whether 1098 * the grace period has ended in the current net 1099 * namespace. Return code is the size in bytes of the 1100 * string. Writing a string that starts with 'Y', 'y', or 1101 * '1' to the file will end the grace period for nfsd's v4 1102 * lock manager. 1103 */ 1104static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size) 1105{ 1106 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1107 1108 if (size > 0) { 1109 switch(buf[0]) { 1110 case 'Y': 1111 case 'y': 1112 case '1': 1113 if (!nn->nfsd_serv) 1114 return -EBUSY; 1115 trace_nfsd_end_grace(netns(file)); 1116 nfsd4_end_grace(nn); 1117 break; 1118 default: 1119 return -EINVAL; 1120 } 1121 } 1122 1123 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n", 1124 nn->grace_ended ? 'Y' : 'N'); 1125} 1126 1127#endif 1128 1129/*----------------------------------------------------------------------------*/ 1130/* 1131 * populating the filesystem. 1132 */ 1133 1134/* Basically copying rpc_get_inode. */ 1135static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode) 1136{ 1137 struct inode *inode = new_inode(sb); 1138 if (!inode) 1139 return NULL; 1140 /* Following advice from simple_fill_super documentation: */ 1141 inode->i_ino = iunique(sb, NFSD_MaxReserved); 1142 inode->i_mode = mode; 1143 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode); 1144 switch (mode & S_IFMT) { 1145 case S_IFDIR: 1146 inode->i_fop = &simple_dir_operations; 1147 inode->i_op = &simple_dir_inode_operations; 1148 inc_nlink(inode); 1149 break; 1150 case S_IFLNK: 1151 inode->i_op = &simple_symlink_inode_operations; 1152 break; 1153 default: 1154 break; 1155 } 1156 return inode; 1157} 1158 1159static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl) 1160{ 1161 struct inode *inode; 1162 1163 inode = nfsd_get_inode(dir->i_sb, mode); 1164 if (!inode) 1165 return -ENOMEM; 1166 if (ncl) { 1167 inode->i_private = ncl; 1168 kref_get(&ncl->cl_ref); 1169 } 1170 d_add(dentry, inode); 1171 inc_nlink(dir); 1172 fsnotify_mkdir(dir, dentry); 1173 return 0; 1174} 1175 1176static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name) 1177{ 1178 struct inode *dir = parent->d_inode; 1179 struct dentry *dentry; 1180 int ret = -ENOMEM; 1181 1182 inode_lock(dir); 1183 dentry = d_alloc_name(parent, name); 1184 if (!dentry) 1185 goto out_err; 1186 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl); 1187 if (ret) 1188 goto out_err; 1189out: 1190 inode_unlock(dir); 1191 return dentry; 1192out_err: 1193 dput(dentry); 1194 dentry = ERR_PTR(ret); 1195 goto out; 1196} 1197 1198#if IS_ENABLED(CONFIG_SUNRPC_GSS) 1199static int __nfsd_symlink(struct inode *dir, struct dentry *dentry, 1200 umode_t mode, const char *content) 1201{ 1202 struct inode *inode; 1203 1204 inode = nfsd_get_inode(dir->i_sb, mode); 1205 if (!inode) 1206 return -ENOMEM; 1207 1208 inode->i_link = (char *)content; 1209 inode->i_size = strlen(content); 1210 1211 d_add(dentry, inode); 1212 inc_nlink(dir); 1213 fsnotify_create(dir, dentry); 1214 return 0; 1215} 1216 1217/* 1218 * @content is assumed to be a NUL-terminated string that lives 1219 * longer than the symlink itself. 1220 */ 1221static void _nfsd_symlink(struct dentry *parent, const char *name, 1222 const char *content) 1223{ 1224 struct inode *dir = parent->d_inode; 1225 struct dentry *dentry; 1226 int ret; 1227 1228 inode_lock(dir); 1229 dentry = d_alloc_name(parent, name); 1230 if (!dentry) 1231 goto out; 1232 ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content); 1233 if (ret) 1234 dput(dentry); 1235out: 1236 inode_unlock(dir); 1237} 1238#else 1239static inline void _nfsd_symlink(struct dentry *parent, const char *name, 1240 const char *content) 1241{ 1242} 1243 1244#endif 1245 1246static void clear_ncl(struct inode *inode) 1247{ 1248 struct nfsdfs_client *ncl = inode->i_private; 1249 1250 inode->i_private = NULL; 1251 kref_put(&ncl->cl_ref, ncl->cl_release); 1252} 1253 1254static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode) 1255{ 1256 struct nfsdfs_client *nc = inode->i_private; 1257 1258 if (nc) 1259 kref_get(&nc->cl_ref); 1260 return nc; 1261} 1262 1263struct nfsdfs_client *get_nfsdfs_client(struct inode *inode) 1264{ 1265 struct nfsdfs_client *nc; 1266 1267 inode_lock_shared(inode); 1268 nc = __get_nfsdfs_client(inode); 1269 inode_unlock_shared(inode); 1270 return nc; 1271} 1272/* from __rpc_unlink */ 1273static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry) 1274{ 1275 int ret; 1276 1277 clear_ncl(d_inode(dentry)); 1278 dget(dentry); 1279 ret = simple_unlink(dir, dentry); 1280 d_drop(dentry); 1281 fsnotify_unlink(dir, dentry); 1282 dput(dentry); 1283 WARN_ON_ONCE(ret); 1284} 1285 1286static void nfsdfs_remove_files(struct dentry *root) 1287{ 1288 struct dentry *dentry, *tmp; 1289 1290 list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) { 1291 if (!simple_positive(dentry)) { 1292 WARN_ON_ONCE(1); /* I think this can't happen? */ 1293 continue; 1294 } 1295 nfsdfs_remove_file(d_inode(root), dentry); 1296 } 1297} 1298 1299/* XXX: cut'n'paste from simple_fill_super; figure out if we could share 1300 * code instead. */ 1301static int nfsdfs_create_files(struct dentry *root, 1302 const struct tree_descr *files, 1303 struct dentry **fdentries) 1304{ 1305 struct inode *dir = d_inode(root); 1306 struct inode *inode; 1307 struct dentry *dentry; 1308 int i; 1309 1310 inode_lock(dir); 1311 for (i = 0; files->name && files->name[0]; i++, files++) { 1312 dentry = d_alloc_name(root, files->name); 1313 if (!dentry) 1314 goto out; 1315 inode = nfsd_get_inode(d_inode(root)->i_sb, 1316 S_IFREG | files->mode); 1317 if (!inode) { 1318 dput(dentry); 1319 goto out; 1320 } 1321 inode->i_fop = files->ops; 1322 inode->i_private = __get_nfsdfs_client(dir); 1323 d_add(dentry, inode); 1324 fsnotify_create(dir, dentry); 1325 if (fdentries) 1326 fdentries[i] = dentry; 1327 } 1328 inode_unlock(dir); 1329 return 0; 1330out: 1331 nfsdfs_remove_files(root); 1332 inode_unlock(dir); 1333 return -ENOMEM; 1334} 1335 1336/* on success, returns positive number unique to that client. */ 1337struct dentry *nfsd_client_mkdir(struct nfsd_net *nn, 1338 struct nfsdfs_client *ncl, u32 id, 1339 const struct tree_descr *files, 1340 struct dentry **fdentries) 1341{ 1342 struct dentry *dentry; 1343 char name[11]; 1344 int ret; 1345 1346 sprintf(name, "%u", id); 1347 1348 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name); 1349 if (IS_ERR(dentry)) /* XXX: tossing errors? */ 1350 return NULL; 1351 ret = nfsdfs_create_files(dentry, files, fdentries); 1352 if (ret) { 1353 nfsd_client_rmdir(dentry); 1354 return NULL; 1355 } 1356 return dentry; 1357} 1358 1359/* Taken from __rpc_rmdir: */ 1360void nfsd_client_rmdir(struct dentry *dentry) 1361{ 1362 struct inode *dir = d_inode(dentry->d_parent); 1363 struct inode *inode = d_inode(dentry); 1364 int ret; 1365 1366 inode_lock(dir); 1367 nfsdfs_remove_files(dentry); 1368 clear_ncl(inode); 1369 dget(dentry); 1370 ret = simple_rmdir(dir, dentry); 1371 WARN_ON_ONCE(ret); 1372 d_drop(dentry); 1373 fsnotify_rmdir(dir, dentry); 1374 dput(dentry); 1375 inode_unlock(dir); 1376} 1377 1378static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc) 1379{ 1380 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 1381 nfsd_net_id); 1382 struct dentry *dentry; 1383 int ret; 1384 1385 static const struct tree_descr nfsd_files[] = { 1386 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO}, 1387 /* Per-export io stats use same ops as exports file */ 1388 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO}, 1389 [NFSD_Export_features] = {"export_features", 1390 &export_features_fops, S_IRUGO}, 1391 [NFSD_FO_UnlockIP] = {"unlock_ip", 1392 &transaction_ops, S_IWUSR|S_IRUSR}, 1393 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1394 &transaction_ops, S_IWUSR|S_IRUSR}, 1395 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1396 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1397 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1398 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1399 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", 1400 &nfsd_reply_cache_stats_fops, S_IRUGO}, 1401 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1402 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1403 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1404 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO}, 1405 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO}, 1406#ifdef CONFIG_NFSD_V4 1407 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1408 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1409 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1410 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO}, 1411#endif 1412 /* last one */ {""} 1413 }; 1414 1415 ret = simple_fill_super(sb, 0x6e667364, nfsd_files); 1416 if (ret) 1417 return ret; 1418 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes", 1419 "/proc/net/rpc/gss_krb5_enctypes"); 1420 dentry = nfsd_mkdir(sb->s_root, NULL, "clients"); 1421 if (IS_ERR(dentry)) 1422 return PTR_ERR(dentry); 1423 nn->nfsd_client_dir = dentry; 1424 return 0; 1425} 1426 1427static int nfsd_fs_get_tree(struct fs_context *fc) 1428{ 1429 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns)); 1430} 1431 1432static void nfsd_fs_free_fc(struct fs_context *fc) 1433{ 1434 if (fc->s_fs_info) 1435 put_net(fc->s_fs_info); 1436} 1437 1438static const struct fs_context_operations nfsd_fs_context_ops = { 1439 .free = nfsd_fs_free_fc, 1440 .get_tree = nfsd_fs_get_tree, 1441}; 1442 1443static int nfsd_init_fs_context(struct fs_context *fc) 1444{ 1445 put_user_ns(fc->user_ns); 1446 fc->user_ns = get_user_ns(fc->net_ns->user_ns); 1447 fc->ops = &nfsd_fs_context_ops; 1448 return 0; 1449} 1450 1451static void nfsd_umount(struct super_block *sb) 1452{ 1453 struct net *net = sb->s_fs_info; 1454 1455 nfsd_shutdown_threads(net); 1456 1457 kill_litter_super(sb); 1458 put_net(net); 1459} 1460 1461static struct file_system_type nfsd_fs_type = { 1462 .owner = THIS_MODULE, 1463 .name = "nfsd", 1464 .init_fs_context = nfsd_init_fs_context, 1465 .kill_sb = nfsd_umount, 1466}; 1467MODULE_ALIAS_FS("nfsd"); 1468 1469#ifdef CONFIG_PROC_FS 1470 1471static int exports_proc_open(struct inode *inode, struct file *file) 1472{ 1473 return exports_net_open(current->nsproxy->net_ns, file); 1474} 1475 1476static const struct proc_ops exports_proc_ops = { 1477 .proc_open = exports_proc_open, 1478 .proc_read = seq_read, 1479 .proc_lseek = seq_lseek, 1480 .proc_release = seq_release, 1481}; 1482 1483static int create_proc_exports_entry(void) 1484{ 1485 struct proc_dir_entry *entry; 1486 1487 entry = proc_mkdir("fs/nfs", NULL); 1488 if (!entry) 1489 return -ENOMEM; 1490 entry = proc_create("exports", 0, entry, &exports_proc_ops); 1491 if (!entry) { 1492 remove_proc_entry("fs/nfs", NULL); 1493 return -ENOMEM; 1494 } 1495 return 0; 1496} 1497#else /* CONFIG_PROC_FS */ 1498static int create_proc_exports_entry(void) 1499{ 1500 return 0; 1501} 1502#endif 1503 1504unsigned int nfsd_net_id; 1505 1506/** 1507 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace 1508 * @net: a freshly-created network namespace 1509 * 1510 * This information stays around as long as the network namespace is 1511 * alive whether or not there is an NFSD instance running in the 1512 * namespace. 1513 * 1514 * Returns zero on success, or a negative errno otherwise. 1515 */ 1516static __net_init int nfsd_net_init(struct net *net) 1517{ 1518 int retval; 1519 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1520 1521 retval = nfsd_export_init(net); 1522 if (retval) 1523 goto out_export_error; 1524 retval = nfsd_idmap_init(net); 1525 if (retval) 1526 goto out_idmap_error; 1527 retval = nfsd_net_reply_cache_init(nn); 1528 if (retval) 1529 goto out_repcache_error; 1530 nn->nfsd_versions = NULL; 1531 nn->nfsd4_minorversions = NULL; 1532 nfsd4_init_leases_net(nn); 1533 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key)); 1534 seqlock_init(&nn->writeverf_lock); 1535 1536 return 0; 1537 1538out_repcache_error: 1539 nfsd_idmap_shutdown(net); 1540out_idmap_error: 1541 nfsd_export_shutdown(net); 1542out_export_error: 1543 return retval; 1544} 1545 1546/** 1547 * nfsd_net_exit - Release the nfsd_net portion of a net namespace 1548 * @net: a network namespace that is about to be destroyed 1549 * 1550 */ 1551static __net_exit void nfsd_net_exit(struct net *net) 1552{ 1553 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1554 1555 nfsd_net_reply_cache_destroy(nn); 1556 nfsd_idmap_shutdown(net); 1557 nfsd_export_shutdown(net); 1558 nfsd_netns_free_versions(nn); 1559} 1560 1561static struct pernet_operations nfsd_net_ops = { 1562 .init = nfsd_net_init, 1563 .exit = nfsd_net_exit, 1564 .id = &nfsd_net_id, 1565 .size = sizeof(struct nfsd_net), 1566}; 1567 1568static int __init init_nfsd(void) 1569{ 1570 int retval; 1571 1572 retval = nfsd4_init_slabs(); 1573 if (retval) 1574 return retval; 1575 retval = nfsd4_init_pnfs(); 1576 if (retval) 1577 goto out_free_slabs; 1578 retval = nfsd_stat_init(); /* Statistics */ 1579 if (retval) 1580 goto out_free_pnfs; 1581 retval = nfsd_drc_slab_create(); 1582 if (retval) 1583 goto out_free_stat; 1584 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 1585 retval = create_proc_exports_entry(); 1586 if (retval) 1587 goto out_free_lockd; 1588 retval = register_pernet_subsys(&nfsd_net_ops); 1589 if (retval < 0) 1590 goto out_free_exports; 1591 retval = register_cld_notifier(); 1592 if (retval) 1593 goto out_free_subsys; 1594 retval = nfsd4_create_laundry_wq(); 1595 if (retval) 1596 goto out_free_cld; 1597 retval = register_filesystem(&nfsd_fs_type); 1598 if (retval) 1599 goto out_free_all; 1600 return 0; 1601out_free_all: 1602 nfsd4_destroy_laundry_wq(); 1603out_free_cld: 1604 unregister_cld_notifier(); 1605out_free_subsys: 1606 unregister_pernet_subsys(&nfsd_net_ops); 1607out_free_exports: 1608 remove_proc_entry("fs/nfs/exports", NULL); 1609 remove_proc_entry("fs/nfs", NULL); 1610out_free_lockd: 1611 nfsd_lockd_shutdown(); 1612 nfsd_drc_slab_free(); 1613out_free_stat: 1614 nfsd_stat_shutdown(); 1615out_free_pnfs: 1616 nfsd4_exit_pnfs(); 1617out_free_slabs: 1618 nfsd4_free_slabs(); 1619 return retval; 1620} 1621 1622static void __exit exit_nfsd(void) 1623{ 1624 unregister_filesystem(&nfsd_fs_type); 1625 nfsd4_destroy_laundry_wq(); 1626 unregister_cld_notifier(); 1627 unregister_pernet_subsys(&nfsd_net_ops); 1628 nfsd_drc_slab_free(); 1629 remove_proc_entry("fs/nfs/exports", NULL); 1630 remove_proc_entry("fs/nfs", NULL); 1631 nfsd_stat_shutdown(); 1632 nfsd_lockd_shutdown(); 1633 nfsd4_free_slabs(); 1634 nfsd4_exit_pnfs(); 1635} 1636 1637MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1638MODULE_DESCRIPTION("In-kernel NFS server"); 1639MODULE_LICENSE("GPL"); 1640module_init(init_nfsd) 1641module_exit(exit_nfsd) 1642