1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2010 Marcel Moolenaar 5 * Copyright (c) 1999-2004 Poul-Henning Kamp 6 * Copyright (c) 1999 Michael Smith 7 * Copyright (c) 1989, 1993 8 * The Regents of the University of California. All rights reserved. 9 * (c) UNIX System Laboratories, Inc. 10 * All or some portions of this file are derived from material licensed 11 * to the University of California by American Telephone and Telegraph 12 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 13 * the permission of UNIX System Laboratories, Inc. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #include "opt_rootdevname.h" 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/conf.h> 47 #include <sys/cons.h> 48 #include <sys/eventhandler.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/kernel.h> 52 #include <sys/malloc.h> 53 #include <sys/mdioctl.h> 54 #include <sys/mount.h> 55 #include <sys/mutex.h> 56 #include <sys/namei.h> 57 #include <sys/priv.h> 58 #include <sys/proc.h> 59 #include <sys/filedesc.h> 60 #include <sys/reboot.h> 61 #include <sys/sbuf.h> 62 #include <sys/stat.h> 63 #include <sys/syscallsubr.h> 64 #include <sys/sysproto.h> 65 #include <sys/sx.h> 66 #include <sys/sysctl.h> 67 #include <sys/sysent.h> 68 #include <sys/systm.h> 69 #include <sys/vnode.h> 70 71 #include <geom/geom.h> 72 73 /* 74 * The root filesystem is detailed in the kernel environment variable 75 * vfs.root.mountfrom, which is expected to be in the general format 76 * 77 * <vfsname>:[<path>][ <vfsname>:[<path>] ...] 78 * vfsname := the name of a VFS known to the kernel and capable 79 * of being mounted as root 80 * path := disk device name or other data used by the filesystem 81 * to locate its physical store 82 * 83 * If the environment variable vfs.root.mountfrom is a space separated list, 84 * each list element is tried in turn and the root filesystem will be mounted 85 * from the first one that succeeds. 86 * 87 * The environment variable vfs.root.mountfrom.options is a comma delimited 88 * set of string mount options. These mount options must be parseable 89 * by nmount() in the kernel. 90 */ 91 92 static int parse_mount(char **); 93 static struct mntarg *parse_mountroot_options(struct mntarg *, const char *); 94 static int sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS); 95 static void vfs_mountroot_wait(void); 96 static int vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev); 97 98 /* 99 * The vnode of the system's root (/ in the filesystem, without chroot 100 * active.) 101 */ 102 struct vnode *rootvnode; 103 104 /* 105 * Mount of the system's /dev. 106 */ 107 struct mount *rootdevmp; 108 109 char *rootdevnames[2] = {NULL, NULL}; 110 111 struct mtx root_holds_mtx; 112 MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF); 113 114 static TAILQ_HEAD(, root_hold_token) root_holds = 115 TAILQ_HEAD_INITIALIZER(root_holds); 116 117 enum action { 118 A_CONTINUE, 119 A_PANIC, 120 A_REBOOT, 121 A_RETRY 122 }; 123 124 enum rh_flags { 125 RH_FREE, 126 RH_ALLOC, 127 RH_ARG, 128 }; 129 130 static enum action root_mount_onfail = A_CONTINUE; 131 132 static int root_mount_mddev; 133 static int root_mount_complete; 134 135 /* By default wait up to 3 seconds for devices to appear. */ 136 static int root_mount_timeout = 3; 137 TUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout); 138 139 static int root_mount_always_wait = 0; 140 SYSCTL_INT(_vfs, OID_AUTO, root_mount_always_wait, CTLFLAG_RDTUN, 141 &root_mount_always_wait, 0, 142 "Wait for root mount holds even if the root device already exists"); 143 144 SYSCTL_PROC(_vfs, OID_AUTO, root_mount_hold, 145 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 146 NULL, 0, sysctl_vfs_root_mount_hold, "A", 147 "List of root mount hold tokens"); 148 149 static int 150 sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS) 151 { 152 struct sbuf sb; 153 struct root_hold_token *h; 154 int error; 155 156 sbuf_new(&sb, NULL, 256, SBUF_AUTOEXTEND | SBUF_INCLUDENUL); 157 158 mtx_lock(&root_holds_mtx); 159 TAILQ_FOREACH(h, &root_holds, list) { 160 if (h != TAILQ_FIRST(&root_holds)) 161 sbuf_putc(&sb, ' '); 162 sbuf_printf(&sb, "%s", h->who); 163 } 164 mtx_unlock(&root_holds_mtx); 165 166 error = sbuf_finish(&sb); 167 if (error == 0) 168 error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb)); 169 sbuf_delete(&sb); 170 return (error); 171 } 172 173 struct root_hold_token * 174 root_mount_hold(const char *identifier) 175 { 176 struct root_hold_token *h; 177 178 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 179 h->flags = RH_ALLOC; 180 h->who = identifier; 181 mtx_lock(&root_holds_mtx); 182 TSHOLD("root mount"); 183 TAILQ_INSERT_TAIL(&root_holds, h, list); 184 mtx_unlock(&root_holds_mtx); 185 return (h); 186 } 187 188 void 189 root_mount_hold_token(const char *identifier, struct root_hold_token *h) 190 { 191 #ifdef INVARIANTS 192 struct root_hold_token *t; 193 #endif 194 195 h->flags = RH_ARG; 196 h->who = identifier; 197 mtx_lock(&root_holds_mtx); 198 #ifdef INVARIANTS 199 TAILQ_FOREACH(t, &root_holds, list) { 200 if (t == h) { 201 panic("Duplicate mount hold by '%s' on %p", 202 identifier, h); 203 } 204 } 205 #endif 206 TSHOLD("root mount"); 207 TAILQ_INSERT_TAIL(&root_holds, h, list); 208 mtx_unlock(&root_holds_mtx); 209 } 210 211 void 212 root_mount_rel(struct root_hold_token *h) 213 { 214 215 if (h == NULL || h->flags == RH_FREE) 216 return; 217 218 mtx_lock(&root_holds_mtx); 219 TAILQ_REMOVE(&root_holds, h, list); 220 TSRELEASE("root mount"); 221 wakeup(&root_holds); 222 mtx_unlock(&root_holds_mtx); 223 if (h->flags == RH_ALLOC) { 224 free(h, M_DEVBUF); 225 } else 226 h->flags = RH_FREE; 227 } 228 229 int 230 root_mounted(void) 231 { 232 233 /* No mutex is acquired here because int stores are atomic. */ 234 return (root_mount_complete); 235 } 236 237 static void 238 set_rootvnode(void) 239 { 240 241 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 242 panic("set_rootvnode: Cannot find root vnode"); 243 244 VOP_UNLOCK(rootvnode); 245 246 pwd_set_rootvnode(); 247 } 248 249 static int 250 vfs_mountroot_devfs(struct thread *td, struct mount **mpp) 251 { 252 struct vfsoptlist *opts; 253 struct vfsconf *vfsp; 254 struct mount *mp; 255 int error; 256 257 *mpp = NULL; 258 259 if (rootdevmp != NULL) { 260 /* 261 * Already have /dev; this happens during rerooting. 262 */ 263 error = vfs_busy(rootdevmp, 0); 264 if (error != 0) 265 return (error); 266 *mpp = rootdevmp; 267 } else { 268 vfsp = vfs_byname("devfs"); 269 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 270 if (vfsp == NULL) 271 return (ENOENT); 272 273 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 274 275 error = VFS_MOUNT(mp); 276 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 277 if (error) 278 return (error); 279 280 error = VFS_STATFS(mp, &mp->mnt_stat); 281 KASSERT(error == 0, ("VFS_STATFS(devfs) failed %d", error)); 282 if (error) 283 return (error); 284 285 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 286 TAILQ_INIT(opts); 287 mp->mnt_opt = opts; 288 289 mtx_lock(&mountlist_mtx); 290 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 291 mtx_unlock(&mountlist_mtx); 292 293 *mpp = mp; 294 rootdevmp = mp; 295 vfs_op_exit(mp); 296 } 297 298 set_rootvnode(); 299 300 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE); 301 if (error) 302 printf("kern_symlink /dev -> / returns %d\n", error); 303 304 return (error); 305 } 306 307 static void 308 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 309 { 310 struct nameidata nd; 311 struct mount *mporoot, *mpnroot; 312 struct vnode *vp, *vporoot, *vpdevfs; 313 char *fspath; 314 int error; 315 316 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 317 318 /* Shuffle the mountlist. */ 319 mtx_lock(&mountlist_mtx); 320 mporoot = TAILQ_FIRST(&mountlist); 321 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 322 if (mporoot != mpdevfs) { 323 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 324 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 325 } 326 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 327 mtx_unlock(&mountlist_mtx); 328 329 cache_purgevfs(mporoot); 330 if (mporoot != mpdevfs) 331 cache_purgevfs(mpdevfs); 332 333 if (VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot)) 334 panic("vfs_mountroot_shuffle: Cannot find root vnode"); 335 336 VI_LOCK(vporoot); 337 vporoot->v_iflag &= ~VI_MOUNT; 338 vn_irflag_unset_locked(vporoot, VIRF_MOUNTPOINT); 339 vporoot->v_mountedhere = NULL; 340 VI_UNLOCK(vporoot); 341 mporoot->mnt_flag &= ~MNT_ROOTFS; 342 mporoot->mnt_vnodecovered = NULL; 343 vput(vporoot); 344 345 /* Set up the new rootvnode, and purge the cache */ 346 mpnroot->mnt_vnodecovered = NULL; 347 set_rootvnode(); 348 cache_purgevfs(rootvnode->v_mount); 349 350 if (mporoot != mpdevfs) { 351 /* Remount old root under /.mount or /mnt */ 352 fspath = "/.mount"; 353 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 354 fspath, td); 355 error = namei(&nd); 356 if (error) { 357 NDFREE(&nd, NDF_ONLY_PNBUF); 358 fspath = "/mnt"; 359 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 360 fspath, td); 361 error = namei(&nd); 362 } 363 if (!error) { 364 vp = nd.ni_vp; 365 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 366 if (!error) 367 error = vinvalbuf(vp, V_SAVE, 0, 0); 368 if (!error) { 369 cache_purge(vp); 370 mporoot->mnt_vnodecovered = vp; 371 vp->v_mountedhere = mporoot; 372 strlcpy(mporoot->mnt_stat.f_mntonname, 373 fspath, MNAMELEN); 374 VOP_UNLOCK(vp); 375 } else 376 vput(vp); 377 } 378 NDFREE(&nd, NDF_ONLY_PNBUF); 379 380 if (error) 381 printf("mountroot: unable to remount previous root " 382 "under /.mount or /mnt (error %d)\n", error); 383 } 384 385 /* Remount devfs under /dev */ 386 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 387 error = namei(&nd); 388 if (!error) { 389 vp = nd.ni_vp; 390 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 391 if (!error) 392 error = vinvalbuf(vp, V_SAVE, 0, 0); 393 if (!error) { 394 vpdevfs = mpdevfs->mnt_vnodecovered; 395 if (vpdevfs != NULL) { 396 cache_purge(vpdevfs); 397 VI_LOCK(vpdevfs); 398 vn_irflag_unset_locked(vpdevfs, VIRF_MOUNTPOINT); 399 vpdevfs->v_mountedhere = NULL; 400 VI_UNLOCK(vpdevfs); 401 vrele(vpdevfs); 402 } 403 VI_LOCK(vp); 404 mpdevfs->mnt_vnodecovered = vp; 405 vn_irflag_set_locked(vp, VIRF_MOUNTPOINT); 406 vp->v_mountedhere = mpdevfs; 407 VI_UNLOCK(vp); 408 VOP_UNLOCK(vp); 409 } else 410 vput(vp); 411 } 412 if (error) 413 printf("mountroot: unable to remount devfs under /dev " 414 "(error %d)\n", error); 415 NDFREE(&nd, NDF_ONLY_PNBUF); 416 417 if (mporoot == mpdevfs) { 418 vfs_unbusy(mpdevfs); 419 /* Unlink the no longer needed /dev/dev -> / symlink */ 420 error = kern_funlinkat(td, AT_FDCWD, "/dev/dev", FD_NONE, 421 UIO_SYSSPACE, 0, 0); 422 if (error) 423 printf("mountroot: unable to unlink /dev/dev " 424 "(error %d)\n", error); 425 } 426 } 427 428 /* 429 * Configuration parser. 430 */ 431 432 /* Parser character classes. */ 433 #define CC_WHITESPACE -1 434 #define CC_NONWHITESPACE -2 435 436 /* Parse errors. */ 437 #define PE_EOF -1 438 #define PE_EOL -2 439 440 static __inline int 441 parse_peek(char **conf) 442 { 443 444 return (**conf); 445 } 446 447 static __inline void 448 parse_poke(char **conf, int c) 449 { 450 451 **conf = c; 452 } 453 454 static __inline void 455 parse_advance(char **conf) 456 { 457 458 (*conf)++; 459 } 460 461 static int 462 parse_skipto(char **conf, int mc) 463 { 464 int c, match; 465 466 while (1) { 467 c = parse_peek(conf); 468 if (c == 0) 469 return (PE_EOF); 470 switch (mc) { 471 case CC_WHITESPACE: 472 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 473 break; 474 case CC_NONWHITESPACE: 475 if (c == '\n') 476 return (PE_EOL); 477 match = (c != ' ' && c != '\t') ? 1 : 0; 478 break; 479 default: 480 match = (c == mc) ? 1 : 0; 481 break; 482 } 483 if (match) 484 break; 485 parse_advance(conf); 486 } 487 return (0); 488 } 489 490 static int 491 parse_token(char **conf, char **tok) 492 { 493 char *p; 494 size_t len; 495 int error; 496 497 *tok = NULL; 498 error = parse_skipto(conf, CC_NONWHITESPACE); 499 if (error) 500 return (error); 501 p = *conf; 502 error = parse_skipto(conf, CC_WHITESPACE); 503 len = *conf - p; 504 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 505 bcopy(p, *tok, len); 506 return (0); 507 } 508 509 static void 510 parse_dir_ask_printenv(const char *var) 511 { 512 char *val; 513 514 val = kern_getenv(var); 515 if (val != NULL) { 516 printf(" %s=%s\n", var, val); 517 freeenv(val); 518 } 519 } 520 521 static int 522 parse_dir_ask(char **conf) 523 { 524 char name[80]; 525 char *mnt; 526 int error; 527 528 vfs_mountroot_wait(); 529 530 printf("\nLoader variables:\n"); 531 parse_dir_ask_printenv("vfs.root.mountfrom"); 532 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 533 534 printf("\nManual root filesystem specification:\n"); 535 printf(" <fstype>:<device> [options]\n"); 536 printf(" Mount <device> using filesystem <fstype>\n"); 537 printf(" and with the specified (optional) option list.\n"); 538 printf("\n"); 539 printf(" eg. ufs:/dev/da0s1a\n"); 540 printf(" zfs:zroot/ROOT/default\n"); 541 printf(" cd9660:/dev/cd0 ro\n"); 542 printf(" (which is equivalent to: "); 543 printf("mount -t cd9660 -o ro /dev/cd0 /)\n"); 544 printf("\n"); 545 printf(" ? List valid disk boot devices\n"); 546 printf(" . Yield 1 second (for background tasks)\n"); 547 printf(" <empty line> Abort manual input\n"); 548 549 do { 550 error = EINVAL; 551 printf("\nmountroot> "); 552 cngets(name, sizeof(name), GETS_ECHO); 553 if (name[0] == '\0') 554 break; 555 if (name[0] == '?' && name[1] == '\0') { 556 printf("\nList of GEOM managed disk devices:\n "); 557 g_dev_print(); 558 continue; 559 } 560 if (name[0] == '.' && name[1] == '\0') { 561 pause("rmask", hz); 562 continue; 563 } 564 mnt = name; 565 error = parse_mount(&mnt); 566 if (error == -1) 567 printf("Invalid file system specification.\n"); 568 } while (error != 0); 569 570 return (error); 571 } 572 573 static int 574 parse_dir_md(char **conf) 575 { 576 struct stat sb; 577 struct thread *td; 578 struct md_ioctl *mdio; 579 char *path, *tok; 580 int error, fd, len; 581 582 td = curthread; 583 fd = -1; 584 585 error = parse_token(conf, &tok); 586 if (error) 587 return (error); 588 589 len = strlen(tok); 590 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 591 path = (void *)(mdio + 1); 592 bcopy(tok, path, len); 593 free(tok, M_TEMP); 594 595 /* Get file status. */ 596 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL); 597 if (error) 598 goto out; 599 600 /* Open /dev/mdctl so that we can attach/detach. */ 601 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE, 602 O_RDWR, 0); 603 if (error) 604 goto out; 605 606 fd = td->td_retval[0]; 607 mdio->md_version = MDIOVERSION; 608 mdio->md_type = MD_VNODE; 609 610 if (root_mount_mddev != -1) { 611 mdio->md_unit = root_mount_mddev; 612 (void)kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 613 /* Ignore errors. We don't care. */ 614 root_mount_mddev = -1; 615 } 616 617 mdio->md_file = (void *)(mdio + 1); 618 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 619 mdio->md_mediasize = sb.st_size; 620 mdio->md_unit = 0; 621 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 622 if (error) 623 goto out; 624 625 if (mdio->md_unit > 9) { 626 printf("rootmount: too many md units\n"); 627 mdio->md_file = NULL; 628 mdio->md_options = 0; 629 mdio->md_mediasize = 0; 630 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 631 /* Ignore errors. We don't care. */ 632 error = ERANGE; 633 goto out; 634 } 635 636 root_mount_mddev = mdio->md_unit; 637 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 638 639 out: 640 if (fd >= 0) 641 (void)kern_close(td, fd); 642 free(mdio, M_TEMP); 643 return (error); 644 } 645 646 static int 647 parse_dir_onfail(char **conf) 648 { 649 char *action; 650 int error; 651 652 error = parse_token(conf, &action); 653 if (error) 654 return (error); 655 656 if (!strcmp(action, "continue")) 657 root_mount_onfail = A_CONTINUE; 658 else if (!strcmp(action, "panic")) 659 root_mount_onfail = A_PANIC; 660 else if (!strcmp(action, "reboot")) 661 root_mount_onfail = A_REBOOT; 662 else if (!strcmp(action, "retry")) 663 root_mount_onfail = A_RETRY; 664 else { 665 printf("rootmount: %s: unknown action\n", action); 666 error = EINVAL; 667 } 668 669 free(action, M_TEMP); 670 return (0); 671 } 672 673 static int 674 parse_dir_timeout(char **conf) 675 { 676 char *tok, *endtok; 677 long secs; 678 int error; 679 680 error = parse_token(conf, &tok); 681 if (error) 682 return (error); 683 684 secs = strtol(tok, &endtok, 0); 685 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 686 if (!error) 687 root_mount_timeout = secs; 688 free(tok, M_TEMP); 689 return (error); 690 } 691 692 static int 693 parse_directive(char **conf) 694 { 695 char *dir; 696 int error; 697 698 error = parse_token(conf, &dir); 699 if (error) 700 return (error); 701 702 if (strcmp(dir, ".ask") == 0) 703 error = parse_dir_ask(conf); 704 else if (strcmp(dir, ".md") == 0) 705 error = parse_dir_md(conf); 706 else if (strcmp(dir, ".onfail") == 0) 707 error = parse_dir_onfail(conf); 708 else if (strcmp(dir, ".timeout") == 0) 709 error = parse_dir_timeout(conf); 710 else { 711 printf("mountroot: invalid directive `%s'\n", dir); 712 /* Ignore the rest of the line. */ 713 (void)parse_skipto(conf, '\n'); 714 error = EINVAL; 715 } 716 free(dir, M_TEMP); 717 return (error); 718 } 719 720 static int 721 parse_mount_dev_present(const char *dev) 722 { 723 struct nameidata nd; 724 int error; 725 726 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 727 error = namei(&nd); 728 if (!error) 729 vput(nd.ni_vp); 730 NDFREE(&nd, NDF_ONLY_PNBUF); 731 return (error != 0) ? 0 : 1; 732 } 733 734 #define ERRMSGL 255 735 static int 736 parse_mount(char **conf) 737 { 738 char *errmsg; 739 struct mntarg *ma; 740 char *dev, *fs, *opts, *tok; 741 int delay, error, timeout; 742 743 error = parse_token(conf, &tok); 744 if (error) 745 return (error); 746 fs = tok; 747 error = parse_skipto(&tok, ':'); 748 if (error) { 749 free(fs, M_TEMP); 750 return (error); 751 } 752 parse_poke(&tok, '\0'); 753 parse_advance(&tok); 754 dev = tok; 755 756 if (root_mount_mddev != -1) { 757 /* Handle substitution for the md unit number. */ 758 tok = strstr(dev, "md#"); 759 if (tok != NULL) 760 tok[2] = '0' + root_mount_mddev; 761 } 762 763 /* Parse options. */ 764 error = parse_token(conf, &tok); 765 opts = (error == 0) ? tok : NULL; 766 767 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 768 (opts != NULL) ? opts : ""); 769 770 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 771 772 if (vfs_byname(fs) == NULL) { 773 strlcpy(errmsg, "unknown file system", ERRMSGL); 774 error = ENOENT; 775 goto out; 776 } 777 778 error = vfs_mountroot_wait_if_neccessary(fs, dev); 779 if (error != 0) 780 goto out; 781 782 delay = hz / 10; 783 timeout = root_mount_timeout * hz; 784 785 for (;;) { 786 ma = NULL; 787 ma = mount_arg(ma, "fstype", fs, -1); 788 ma = mount_arg(ma, "fspath", "/", -1); 789 ma = mount_arg(ma, "from", dev, -1); 790 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 791 ma = mount_arg(ma, "ro", NULL, 0); 792 ma = parse_mountroot_options(ma, opts); 793 794 error = kernel_mount(ma, MNT_ROOTFS); 795 if (error == 0 || timeout <= 0) 796 break; 797 798 if (root_mount_timeout * hz == timeout || 799 (bootverbose && timeout % hz == 0)) { 800 printf("Mounting from %s:%s failed with error %d; " 801 "retrying for %d more second%s\n", fs, dev, error, 802 timeout / hz, (timeout / hz > 1) ? "s" : ""); 803 } 804 pause("rmretry", delay); 805 timeout -= delay; 806 } 807 out: 808 if (error) { 809 printf("Mounting from %s:%s failed with error %d", 810 fs, dev, error); 811 if (errmsg[0] != '\0') 812 printf(": %s", errmsg); 813 printf(".\n"); 814 } 815 free(fs, M_TEMP); 816 free(errmsg, M_TEMP); 817 if (opts != NULL) 818 free(opts, M_TEMP); 819 /* kernel_mount can return -1 on error. */ 820 return ((error < 0) ? EDOOFUS : error); 821 } 822 #undef ERRMSGL 823 824 static int 825 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 826 { 827 struct mount *mp; 828 char *conf; 829 int error; 830 831 root_mount_mddev = -1; 832 833 retry: 834 conf = sbuf_data(sb); 835 mp = TAILQ_NEXT(mpdevfs, mnt_list); 836 error = (mp == NULL) ? 0 : EDOOFUS; 837 root_mount_onfail = A_CONTINUE; 838 while (mp == NULL) { 839 error = parse_skipto(&conf, CC_NONWHITESPACE); 840 if (error == PE_EOL) { 841 parse_advance(&conf); 842 continue; 843 } 844 if (error < 0) 845 break; 846 switch (parse_peek(&conf)) { 847 case '#': 848 error = parse_skipto(&conf, '\n'); 849 break; 850 case '.': 851 error = parse_directive(&conf); 852 break; 853 default: 854 error = parse_mount(&conf); 855 if (error == -1) { 856 printf("mountroot: invalid file system " 857 "specification.\n"); 858 error = 0; 859 } 860 break; 861 } 862 if (error < 0) 863 break; 864 /* Ignore any trailing garbage on the line. */ 865 if (parse_peek(&conf) != '\n') { 866 printf("mountroot: advancing to next directive...\n"); 867 (void)parse_skipto(&conf, '\n'); 868 } 869 mp = TAILQ_NEXT(mpdevfs, mnt_list); 870 } 871 if (mp != NULL) 872 return (0); 873 874 /* 875 * We failed to mount (a new) root. 876 */ 877 switch (root_mount_onfail) { 878 case A_CONTINUE: 879 break; 880 case A_PANIC: 881 panic("mountroot: unable to (re-)mount root."); 882 /* NOTREACHED */ 883 case A_RETRY: 884 goto retry; 885 case A_REBOOT: 886 kern_reboot(RB_NOSYNC); 887 /* NOTREACHED */ 888 } 889 890 return (error); 891 } 892 893 static void 894 vfs_mountroot_conf0(struct sbuf *sb) 895 { 896 char *s, *tok, *mnt, *opt; 897 int error; 898 899 sbuf_printf(sb, ".onfail panic\n"); 900 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 901 if (boothowto & RB_ASKNAME) 902 sbuf_printf(sb, ".ask\n"); 903 #ifdef ROOTDEVNAME 904 if (boothowto & RB_DFLTROOT) 905 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 906 #endif 907 if (boothowto & RB_CDROM) { 908 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 909 sbuf_printf(sb, ".timeout 0\n"); 910 sbuf_printf(sb, "cd9660:/dev/cd1 ro\n"); 911 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 912 } 913 s = kern_getenv("vfs.root.mountfrom"); 914 if (s != NULL) { 915 opt = kern_getenv("vfs.root.mountfrom.options"); 916 tok = s; 917 error = parse_token(&tok, &mnt); 918 while (!error) { 919 sbuf_printf(sb, "%s %s\n", mnt, 920 (opt != NULL) ? opt : ""); 921 free(mnt, M_TEMP); 922 error = parse_token(&tok, &mnt); 923 } 924 if (opt != NULL) 925 freeenv(opt); 926 freeenv(s); 927 } 928 if (rootdevnames[0] != NULL) 929 sbuf_printf(sb, "%s\n", rootdevnames[0]); 930 if (rootdevnames[1] != NULL) 931 sbuf_printf(sb, "%s\n", rootdevnames[1]); 932 #ifdef ROOTDEVNAME 933 if (!(boothowto & RB_DFLTROOT)) 934 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 935 #endif 936 if (!(boothowto & RB_ASKNAME)) 937 sbuf_printf(sb, ".ask\n"); 938 } 939 940 static int 941 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 942 { 943 static char buf[128]; 944 struct nameidata nd; 945 off_t ofs; 946 ssize_t resid; 947 int error, flags, len; 948 949 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 950 flags = FREAD; 951 error = vn_open(&nd, &flags, 0, NULL); 952 if (error) 953 return (error); 954 955 NDFREE(&nd, NDF_ONLY_PNBUF); 956 ofs = 0; 957 len = sizeof(buf) - 1; 958 while (1) { 959 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 960 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 961 NOCRED, &resid, td); 962 if (error) 963 break; 964 if (resid == len) 965 break; 966 buf[len - resid] = 0; 967 sbuf_printf(sb, "%s", buf); 968 ofs += len - resid; 969 } 970 971 VOP_UNLOCK(nd.ni_vp); 972 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 973 return (error); 974 } 975 976 static void 977 vfs_mountroot_wait(void) 978 { 979 struct root_hold_token *h; 980 struct timeval lastfail; 981 int curfail; 982 983 TSENTER(); 984 985 curfail = 0; 986 while (1) { 987 g_waitidle(); 988 mtx_lock(&root_holds_mtx); 989 if (TAILQ_EMPTY(&root_holds)) { 990 mtx_unlock(&root_holds_mtx); 991 break; 992 } 993 if (ppsratecheck(&lastfail, &curfail, 1)) { 994 printf("Root mount waiting for:"); 995 TAILQ_FOREACH(h, &root_holds, list) 996 printf(" %s", h->who); 997 printf("\n"); 998 } 999 TSWAIT("root mount"); 1000 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 1001 hz); 1002 TSUNWAIT("root mount"); 1003 } 1004 1005 TSEXIT(); 1006 } 1007 1008 static int 1009 vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev) 1010 { 1011 int delay, timeout; 1012 1013 /* 1014 * In case of ZFS and NFS we don't have a way to wait for 1015 * specific device. Also do the wait if the user forced that 1016 * behaviour by setting vfs.root_mount_always_wait=1. 1017 */ 1018 if (strcmp(fs, "zfs") == 0 || strstr(fs, "nfs") != NULL || 1019 dev[0] == '\0' || root_mount_always_wait != 0) { 1020 vfs_mountroot_wait(); 1021 return (0); 1022 } 1023 1024 /* 1025 * Otherwise, no point in waiting if the device is already there. 1026 * Note that we must wait for GEOM to finish reconfiguring itself, 1027 * eg for geom_part(4) to finish tasting. 1028 */ 1029 g_waitidle(); 1030 if (parse_mount_dev_present(dev)) 1031 return (0); 1032 1033 /* 1034 * No luck. Let's wait. This code looks weird, but it's that way 1035 * to behave exactly as it used to work before. 1036 */ 1037 vfs_mountroot_wait(); 1038 printf("mountroot: waiting for device %s...\n", dev); 1039 delay = hz / 10; 1040 timeout = root_mount_timeout * hz; 1041 do { 1042 pause("rmdev", delay); 1043 timeout -= delay; 1044 } while (timeout > 0 && !parse_mount_dev_present(dev)); 1045 1046 if (timeout <= 0) 1047 return (ENODEV); 1048 1049 return (0); 1050 } 1051 1052 void 1053 vfs_mountroot(void) 1054 { 1055 struct mount *mp; 1056 struct sbuf *sb; 1057 struct thread *td; 1058 time_t timebase; 1059 int error; 1060 1061 mtx_assert(&Giant, MA_NOTOWNED); 1062 1063 TSENTER(); 1064 1065 td = curthread; 1066 1067 sb = sbuf_new_auto(); 1068 vfs_mountroot_conf0(sb); 1069 sbuf_finish(sb); 1070 1071 error = vfs_mountroot_devfs(td, &mp); 1072 while (!error) { 1073 error = vfs_mountroot_parse(sb, mp); 1074 if (!error) { 1075 vfs_mountroot_shuffle(td, mp); 1076 sbuf_clear(sb); 1077 error = vfs_mountroot_readconf(td, sb); 1078 sbuf_finish(sb); 1079 } 1080 } 1081 1082 sbuf_delete(sb); 1083 1084 /* 1085 * Iterate over all currently mounted file systems and use 1086 * the time stamp found to check and/or initialize the RTC. 1087 * Call inittodr() only once and pass it the largest of the 1088 * timestamps we encounter. 1089 */ 1090 timebase = 0; 1091 mtx_lock(&mountlist_mtx); 1092 mp = TAILQ_FIRST(&mountlist); 1093 while (mp != NULL) { 1094 if (mp->mnt_time > timebase) 1095 timebase = mp->mnt_time; 1096 mp = TAILQ_NEXT(mp, mnt_list); 1097 } 1098 mtx_unlock(&mountlist_mtx); 1099 inittodr(timebase); 1100 1101 /* Keep prison0's root in sync with the global rootvnode. */ 1102 mtx_lock(&prison0.pr_mtx); 1103 prison0.pr_root = rootvnode; 1104 vref(prison0.pr_root); 1105 mtx_unlock(&prison0.pr_mtx); 1106 1107 mtx_lock(&root_holds_mtx); 1108 atomic_store_rel_int(&root_mount_complete, 1); 1109 wakeup(&root_mount_complete); 1110 mtx_unlock(&root_holds_mtx); 1111 1112 EVENTHANDLER_INVOKE(mountroot); 1113 1114 TSEXIT(); 1115 } 1116 1117 static struct mntarg * 1118 parse_mountroot_options(struct mntarg *ma, const char *options) 1119 { 1120 char *p; 1121 char *name, *name_arg; 1122 char *val, *val_arg; 1123 char *opts; 1124 1125 if (options == NULL || options[0] == '\0') 1126 return (ma); 1127 1128 p = opts = strdup(options, M_MOUNT); 1129 if (opts == NULL) { 1130 return (ma); 1131 } 1132 1133 while((name = strsep(&p, ",")) != NULL) { 1134 if (name[0] == '\0') 1135 break; 1136 1137 val = strchr(name, '='); 1138 if (val != NULL) { 1139 *val = '\0'; 1140 ++val; 1141 } 1142 if (strcmp(name, "rw") == 0 || strcmp(name, "noro") == 0) { 1143 /* 1144 * The first time we mount the root file system, 1145 * we need to mount 'ro', so We need to ignore 1146 * 'rw' and 'noro' mount options. 1147 */ 1148 continue; 1149 } 1150 name_arg = strdup(name, M_MOUNT); 1151 val_arg = NULL; 1152 if (val != NULL) 1153 val_arg = strdup(val, M_MOUNT); 1154 1155 ma = mount_arg(ma, name_arg, val_arg, 1156 (val_arg != NULL ? -1 : 0)); 1157 } 1158 free(opts, M_MOUNT); 1159 return (ma); 1160 } 1161