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