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