Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_mountroot.c
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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: releng/10.2/sys/kern/vfs_mountroot.c 267752 2014-06-22 21:21:27Z mav $"); 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 92 /* 93 * The vnode of the system's root (/ in the filesystem, without chroot 94 * active.) 95 */ 96 struct vnode *rootvnode; 97 98 char *rootdevnames[2] = {NULL, NULL}; 99 100 struct mtx root_holds_mtx; 101 MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF); 102 103 struct root_hold_token { 104 const char *who; 105 LIST_ENTRY(root_hold_token) list; 106 }; 107 108 static LIST_HEAD(, root_hold_token) root_holds = 109 LIST_HEAD_INITIALIZER(root_holds); 110 111 enum action { 112 A_CONTINUE, 113 A_PANIC, 114 A_REBOOT, 115 A_RETRY 116 }; 117 118 static enum action root_mount_onfail = A_CONTINUE; 119 120 static int root_mount_mddev; 121 static int root_mount_complete; 122 123 /* By default wait up to 3 seconds for devices to appear. */ 124 static int root_mount_timeout = 3; 125 TUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout); 126 127 struct root_hold_token * 128 root_mount_hold(const char *identifier) 129 { 130 struct root_hold_token *h; 131 132 if (root_mounted()) 133 return (NULL); 134 135 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 136 h->who = identifier; 137 mtx_lock(&root_holds_mtx); 138 LIST_INSERT_HEAD(&root_holds, h, list); 139 mtx_unlock(&root_holds_mtx); 140 return (h); 141 } 142 143 void 144 root_mount_rel(struct root_hold_token *h) 145 { 146 147 if (h == NULL) 148 return; 149 mtx_lock(&root_holds_mtx); 150 LIST_REMOVE(h, list); 151 wakeup(&root_holds); 152 mtx_unlock(&root_holds_mtx); 153 free(h, M_DEVBUF); 154 } 155 156 int 157 root_mounted(void) 158 { 159 160 /* No mutex is acquired here because int stores are atomic. */ 161 return (root_mount_complete); 162 } 163 164 void 165 root_mount_wait(void) 166 { 167 168 /* 169 * Panic on an obvious deadlock - the function can't be called from 170 * a thread which is doing the whole SYSINIT stuff. 171 */ 172 KASSERT(curthread->td_proc->p_pid != 0, 173 ("root_mount_wait: cannot be called from the swapper thread")); 174 mtx_lock(&root_holds_mtx); 175 while (!root_mount_complete) { 176 msleep(&root_mount_complete, &root_holds_mtx, PZERO, "rootwait", 177 hz); 178 } 179 mtx_unlock(&root_holds_mtx); 180 } 181 182 static void 183 set_rootvnode(void) 184 { 185 struct proc *p; 186 187 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 188 panic("Cannot find root vnode"); 189 190 VOP_UNLOCK(rootvnode, 0); 191 192 p = curthread->td_proc; 193 FILEDESC_XLOCK(p->p_fd); 194 195 if (p->p_fd->fd_cdir != NULL) 196 vrele(p->p_fd->fd_cdir); 197 p->p_fd->fd_cdir = rootvnode; 198 VREF(rootvnode); 199 200 if (p->p_fd->fd_rdir != NULL) 201 vrele(p->p_fd->fd_rdir); 202 p->p_fd->fd_rdir = rootvnode; 203 VREF(rootvnode); 204 205 FILEDESC_XUNLOCK(p->p_fd); 206 } 207 208 static int 209 vfs_mountroot_devfs(struct thread *td, struct mount **mpp) 210 { 211 struct vfsoptlist *opts; 212 struct vfsconf *vfsp; 213 struct mount *mp; 214 int error; 215 216 *mpp = NULL; 217 218 vfsp = vfs_byname("devfs"); 219 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 220 if (vfsp == NULL) 221 return (ENOENT); 222 223 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 224 225 error = VFS_MOUNT(mp); 226 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 227 if (error) 228 return (error); 229 230 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 231 TAILQ_INIT(opts); 232 mp->mnt_opt = opts; 233 234 mtx_lock(&mountlist_mtx); 235 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 236 mtx_unlock(&mountlist_mtx); 237 238 *mpp = mp; 239 set_rootvnode(); 240 241 error = kern_symlink(td, "/", "dev", UIO_SYSSPACE); 242 if (error) 243 printf("kern_symlink /dev -> / returns %d\n", error); 244 245 return (error); 246 } 247 248 static int 249 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 250 { 251 struct nameidata nd; 252 struct mount *mporoot, *mpnroot; 253 struct vnode *vp, *vporoot, *vpdevfs; 254 char *fspath; 255 int error; 256 257 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 258 259 /* Shuffle the mountlist. */ 260 mtx_lock(&mountlist_mtx); 261 mporoot = TAILQ_FIRST(&mountlist); 262 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 263 if (mporoot != mpdevfs) { 264 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 265 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 266 } 267 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 268 mtx_unlock(&mountlist_mtx); 269 270 cache_purgevfs(mporoot); 271 if (mporoot != mpdevfs) 272 cache_purgevfs(mpdevfs); 273 274 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot); 275 276 VI_LOCK(vporoot); 277 vporoot->v_iflag &= ~VI_MOUNT; 278 VI_UNLOCK(vporoot); 279 vporoot->v_mountedhere = NULL; 280 mporoot->mnt_flag &= ~MNT_ROOTFS; 281 mporoot->mnt_vnodecovered = NULL; 282 vput(vporoot); 283 284 /* Set up the new rootvnode, and purge the cache */ 285 mpnroot->mnt_vnodecovered = NULL; 286 set_rootvnode(); 287 cache_purgevfs(rootvnode->v_mount); 288 289 if (mporoot != mpdevfs) { 290 /* Remount old root under /.mount or /mnt */ 291 fspath = "/.mount"; 292 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 293 fspath, td); 294 error = namei(&nd); 295 if (error) { 296 NDFREE(&nd, NDF_ONLY_PNBUF); 297 fspath = "/mnt"; 298 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 299 fspath, td); 300 error = namei(&nd); 301 } 302 if (!error) { 303 vp = nd.ni_vp; 304 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 305 if (!error) 306 error = vinvalbuf(vp, V_SAVE, 0, 0); 307 if (!error) { 308 cache_purge(vp); 309 mporoot->mnt_vnodecovered = vp; 310 vp->v_mountedhere = mporoot; 311 strlcpy(mporoot->mnt_stat.f_mntonname, 312 fspath, MNAMELEN); 313 VOP_UNLOCK(vp, 0); 314 } else 315 vput(vp); 316 } 317 NDFREE(&nd, NDF_ONLY_PNBUF); 318 319 if (error && bootverbose) 320 printf("mountroot: unable to remount previous root " 321 "under /.mount or /mnt (error %d).\n", error); 322 } 323 324 /* Remount devfs under /dev */ 325 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 326 error = namei(&nd); 327 if (!error) { 328 vp = nd.ni_vp; 329 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 330 if (!error) 331 error = vinvalbuf(vp, V_SAVE, 0, 0); 332 if (!error) { 333 vpdevfs = mpdevfs->mnt_vnodecovered; 334 if (vpdevfs != NULL) { 335 cache_purge(vpdevfs); 336 vpdevfs->v_mountedhere = NULL; 337 vrele(vpdevfs); 338 } 339 mpdevfs->mnt_vnodecovered = vp; 340 vp->v_mountedhere = mpdevfs; 341 VOP_UNLOCK(vp, 0); 342 } else 343 vput(vp); 344 } 345 if (error && bootverbose) 346 printf("mountroot: unable to remount devfs under /dev " 347 "(error %d).\n", error); 348 NDFREE(&nd, NDF_ONLY_PNBUF); 349 350 if (mporoot == mpdevfs) { 351 vfs_unbusy(mpdevfs); 352 /* Unlink the no longer needed /dev/dev -> / symlink */ 353 error = kern_unlink(td, "/dev/dev", UIO_SYSSPACE); 354 if (error && bootverbose) 355 printf("mountroot: unable to unlink /dev/dev " 356 "(error %d)\n", error); 357 } 358 359 return (0); 360 } 361 362 /* 363 * Configuration parser. 364 */ 365 366 /* Parser character classes. */ 367 #define CC_WHITESPACE -1 368 #define CC_NONWHITESPACE -2 369 370 /* Parse errors. */ 371 #define PE_EOF -1 372 #define PE_EOL -2 373 374 static __inline int 375 parse_peek(char **conf) 376 { 377 378 return (**conf); 379 } 380 381 static __inline void 382 parse_poke(char **conf, int c) 383 { 384 385 **conf = c; 386 } 387 388 static __inline void 389 parse_advance(char **conf) 390 { 391 392 (*conf)++; 393 } 394 395 static int 396 parse_skipto(char **conf, int mc) 397 { 398 int c, match; 399 400 while (1) { 401 c = parse_peek(conf); 402 if (c == 0) 403 return (PE_EOF); 404 switch (mc) { 405 case CC_WHITESPACE: 406 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 407 break; 408 case CC_NONWHITESPACE: 409 if (c == '\n') 410 return (PE_EOL); 411 match = (c != ' ' && c != '\t') ? 1 : 0; 412 break; 413 default: 414 match = (c == mc) ? 1 : 0; 415 break; 416 } 417 if (match) 418 break; 419 parse_advance(conf); 420 } 421 return (0); 422 } 423 424 static int 425 parse_token(char **conf, char **tok) 426 { 427 char *p; 428 size_t len; 429 int error; 430 431 *tok = NULL; 432 error = parse_skipto(conf, CC_NONWHITESPACE); 433 if (error) 434 return (error); 435 p = *conf; 436 error = parse_skipto(conf, CC_WHITESPACE); 437 len = *conf - p; 438 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 439 bcopy(p, *tok, len); 440 return (0); 441 } 442 443 static void 444 parse_dir_ask_printenv(const char *var) 445 { 446 char *val; 447 448 val = getenv(var); 449 if (val != NULL) { 450 printf(" %s=%s\n", var, val); 451 freeenv(val); 452 } 453 } 454 455 static int 456 parse_dir_ask(char **conf) 457 { 458 char name[80]; 459 char *mnt; 460 int error; 461 462 printf("\nLoader variables:\n"); 463 parse_dir_ask_printenv("vfs.root.mountfrom"); 464 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 465 466 printf("\nManual root filesystem specification:\n"); 467 printf(" <fstype>:<device> [options]\n"); 468 printf(" Mount <device> using filesystem <fstype>\n"); 469 printf(" and with the specified (optional) option list.\n"); 470 printf("\n"); 471 printf(" eg. ufs:/dev/da0s1a\n"); 472 printf(" zfs:tank\n"); 473 printf(" cd9660:/dev/acd0 ro\n"); 474 printf(" (which is equivalent to: "); 475 printf("mount -t cd9660 -o ro /dev/acd0 /)\n"); 476 printf("\n"); 477 printf(" ? List valid disk boot devices\n"); 478 printf(" . Yield 1 second (for background tasks)\n"); 479 printf(" <empty line> Abort manual input\n"); 480 481 do { 482 error = EINVAL; 483 printf("\nmountroot> "); 484 cngets(name, sizeof(name), GETS_ECHO); 485 if (name[0] == '\0') 486 break; 487 if (name[0] == '?' && name[1] == '\0') { 488 printf("\nList of GEOM managed disk devices:\n "); 489 g_dev_print(); 490 continue; 491 } 492 if (name[0] == '.' && name[1] == '\0') { 493 pause("rmask", hz); 494 continue; 495 } 496 mnt = name; 497 error = parse_mount(&mnt); 498 if (error == -1) 499 printf("Invalid file system specification.\n"); 500 } while (error != 0); 501 502 return (error); 503 } 504 505 static int 506 parse_dir_md(char **conf) 507 { 508 struct stat sb; 509 struct thread *td; 510 struct md_ioctl *mdio; 511 char *path, *tok; 512 int error, fd, len; 513 514 td = curthread; 515 516 error = parse_token(conf, &tok); 517 if (error) 518 return (error); 519 520 len = strlen(tok); 521 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 522 path = (void *)(mdio + 1); 523 bcopy(tok, path, len); 524 free(tok, M_TEMP); 525 526 /* Get file status. */ 527 error = kern_stat(td, path, UIO_SYSSPACE, &sb); 528 if (error) 529 goto out; 530 531 /* Open /dev/mdctl so that we can attach/detach. */ 532 error = kern_open(td, "/dev/" MDCTL_NAME, UIO_SYSSPACE, O_RDWR, 0); 533 if (error) 534 goto out; 535 536 fd = td->td_retval[0]; 537 mdio->md_version = MDIOVERSION; 538 mdio->md_type = MD_VNODE; 539 540 if (root_mount_mddev != -1) { 541 mdio->md_unit = root_mount_mddev; 542 DROP_GIANT(); 543 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 544 PICKUP_GIANT(); 545 /* Ignore errors. We don't care. */ 546 root_mount_mddev = -1; 547 } 548 549 mdio->md_file = (void *)(mdio + 1); 550 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 551 mdio->md_mediasize = sb.st_size; 552 mdio->md_unit = 0; 553 DROP_GIANT(); 554 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 555 PICKUP_GIANT(); 556 if (error) 557 goto out; 558 559 if (mdio->md_unit > 9) { 560 printf("rootmount: too many md units\n"); 561 mdio->md_file = NULL; 562 mdio->md_options = 0; 563 mdio->md_mediasize = 0; 564 DROP_GIANT(); 565 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 566 PICKUP_GIANT(); 567 /* Ignore errors. We don't care. */ 568 error = ERANGE; 569 goto out; 570 } 571 572 root_mount_mddev = mdio->md_unit; 573 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 574 575 error = kern_close(td, fd); 576 577 out: 578 free(mdio, M_TEMP); 579 return (error); 580 } 581 582 static int 583 parse_dir_onfail(char **conf) 584 { 585 char *action; 586 int error; 587 588 error = parse_token(conf, &action); 589 if (error) 590 return (error); 591 592 if (!strcmp(action, "continue")) 593 root_mount_onfail = A_CONTINUE; 594 else if (!strcmp(action, "panic")) 595 root_mount_onfail = A_PANIC; 596 else if (!strcmp(action, "reboot")) 597 root_mount_onfail = A_REBOOT; 598 else if (!strcmp(action, "retry")) 599 root_mount_onfail = A_RETRY; 600 else { 601 printf("rootmount: %s: unknown action\n", action); 602 error = EINVAL; 603 } 604 605 free(action, M_TEMP); 606 return (0); 607 } 608 609 static int 610 parse_dir_timeout(char **conf) 611 { 612 char *tok, *endtok; 613 long secs; 614 int error; 615 616 error = parse_token(conf, &tok); 617 if (error) 618 return (error); 619 620 secs = strtol(tok, &endtok, 0); 621 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 622 if (!error) 623 root_mount_timeout = secs; 624 free(tok, M_TEMP); 625 return (error); 626 } 627 628 static int 629 parse_directive(char **conf) 630 { 631 char *dir; 632 int error; 633 634 error = parse_token(conf, &dir); 635 if (error) 636 return (error); 637 638 if (strcmp(dir, ".ask") == 0) 639 error = parse_dir_ask(conf); 640 else if (strcmp(dir, ".md") == 0) 641 error = parse_dir_md(conf); 642 else if (strcmp(dir, ".onfail") == 0) 643 error = parse_dir_onfail(conf); 644 else if (strcmp(dir, ".timeout") == 0) 645 error = parse_dir_timeout(conf); 646 else { 647 printf("mountroot: invalid directive `%s'\n", dir); 648 /* Ignore the rest of the line. */ 649 (void)parse_skipto(conf, '\n'); 650 error = EINVAL; 651 } 652 free(dir, M_TEMP); 653 return (error); 654 } 655 656 static int 657 parse_mount_dev_present(const char *dev) 658 { 659 struct nameidata nd; 660 int error; 661 662 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 663 error = namei(&nd); 664 if (!error) 665 vput(nd.ni_vp); 666 NDFREE(&nd, NDF_ONLY_PNBUF); 667 return (error != 0) ? 0 : 1; 668 } 669 670 #define ERRMSGL 255 671 static int 672 parse_mount(char **conf) 673 { 674 char *errmsg; 675 struct mntarg *ma; 676 char *dev, *fs, *opts, *tok; 677 int delay, error, timeout; 678 679 error = parse_token(conf, &tok); 680 if (error) 681 return (error); 682 fs = tok; 683 error = parse_skipto(&tok, ':'); 684 if (error) { 685 free(fs, M_TEMP); 686 return (error); 687 } 688 parse_poke(&tok, '\0'); 689 parse_advance(&tok); 690 dev = tok; 691 692 if (root_mount_mddev != -1) { 693 /* Handle substitution for the md unit number. */ 694 tok = strstr(dev, "md#"); 695 if (tok != NULL) 696 tok[2] = '' + root_mount_mddev; 697 } 698 699 /* Parse options. */ 700 error = parse_token(conf, &tok); 701 opts = (error == 0) ? tok : NULL; 702 703 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 704 (opts != NULL) ? opts : ""); 705 706 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 707 708 if (vfs_byname(fs) == NULL) { 709 strlcpy(errmsg, "unknown file system", ERRMSGL); 710 error = ENOENT; 711 goto out; 712 } 713 714 if (strcmp(fs, "zfs") != 0 && strstr(fs, "nfs") == NULL && 715 dev[0] != '\0' && !parse_mount_dev_present(dev)) { 716 printf("mountroot: waiting for device %s ...\n", dev); 717 delay = hz / 10; 718 timeout = root_mount_timeout * hz; 719 do { 720 pause("rmdev", delay); 721 timeout -= delay; 722 } while (timeout > 0 && !parse_mount_dev_present(dev)); 723 if (timeout <= 0) { 724 error = ENODEV; 725 goto out; 726 } 727 } 728 729 ma = NULL; 730 ma = mount_arg(ma, "fstype", fs, -1); 731 ma = mount_arg(ma, "fspath", "/", -1); 732 ma = mount_arg(ma, "from", dev, -1); 733 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 734 ma = mount_arg(ma, "ro", NULL, 0); 735 ma = parse_mountroot_options(ma, opts); 736 error = kernel_mount(ma, MNT_ROOTFS); 737 738 out: 739 if (error) { 740 printf("Mounting from %s:%s failed with error %d", 741 fs, dev, error); 742 if (errmsg[0] != '\0') 743 printf(": %s", errmsg); 744 printf(".\n"); 745 } 746 free(fs, M_TEMP); 747 free(errmsg, M_TEMP); 748 if (opts != NULL) 749 free(opts, M_TEMP); 750 /* kernel_mount can return -1 on error. */ 751 return ((error < 0) ? EDOOFUS : error); 752 } 753 #undef ERRMSGL 754 755 static int 756 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 757 { 758 struct mount *mp; 759 char *conf; 760 int error; 761 762 root_mount_mddev = -1; 763 764 retry: 765 conf = sbuf_data(sb); 766 mp = TAILQ_NEXT(mpdevfs, mnt_list); 767 error = (mp == NULL) ? 0 : EDOOFUS; 768 root_mount_onfail = A_CONTINUE; 769 while (mp == NULL) { 770 error = parse_skipto(&conf, CC_NONWHITESPACE); 771 if (error == PE_EOL) { 772 parse_advance(&conf); 773 continue; 774 } 775 if (error < 0) 776 break; 777 switch (parse_peek(&conf)) { 778 case '#': 779 error = parse_skipto(&conf, '\n'); 780 break; 781 case '.': 782 error = parse_directive(&conf); 783 break; 784 default: 785 error = parse_mount(&conf); 786 break; 787 } 788 if (error < 0) 789 break; 790 /* Ignore any trailing garbage on the line. */ 791 if (parse_peek(&conf) != '\n') { 792 printf("mountroot: advancing to next directive...\n"); 793 (void)parse_skipto(&conf, '\n'); 794 } 795 mp = TAILQ_NEXT(mpdevfs, mnt_list); 796 } 797 if (mp != NULL) 798 return (0); 799 800 /* 801 * We failed to mount (a new) root. 802 */ 803 switch (root_mount_onfail) { 804 case A_CONTINUE: 805 break; 806 case A_PANIC: 807 panic("mountroot: unable to (re-)mount root."); 808 /* NOTREACHED */ 809 case A_RETRY: 810 goto retry; 811 case A_REBOOT: 812 kern_reboot(RB_NOSYNC); 813 /* NOTREACHED */ 814 } 815 816 return (error); 817 } 818 819 static void 820 vfs_mountroot_conf0(struct sbuf *sb) 821 { 822 char *s, *tok, *mnt, *opt; 823 int error; 824 825 sbuf_printf(sb, ".onfail panic\n"); 826 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 827 if (boothowto & RB_ASKNAME) 828 sbuf_printf(sb, ".ask\n"); 829 #ifdef ROOTDEVNAME 830 if (boothowto & RB_DFLTROOT) 831 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 832 #endif 833 if (boothowto & RB_CDROM) { 834 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 835 sbuf_printf(sb, ".timeout 0\n"); 836 sbuf_printf(sb, "cd9660:/dev/acd0 ro\n"); 837 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 838 } 839 s = getenv("vfs.root.mountfrom"); 840 if (s != NULL) { 841 opt = getenv("vfs.root.mountfrom.options"); 842 tok = s; 843 error = parse_token(&tok, &mnt); 844 while (!error) { 845 sbuf_printf(sb, "%s %s\n", mnt, 846 (opt != NULL) ? opt : ""); 847 free(mnt, M_TEMP); 848 error = parse_token(&tok, &mnt); 849 } 850 if (opt != NULL) 851 freeenv(opt); 852 freeenv(s); 853 } 854 if (rootdevnames[0] != NULL) 855 sbuf_printf(sb, "%s\n", rootdevnames[0]); 856 if (rootdevnames[1] != NULL) 857 sbuf_printf(sb, "%s\n", rootdevnames[1]); 858 #ifdef ROOTDEVNAME 859 if (!(boothowto & RB_DFLTROOT)) 860 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 861 #endif 862 if (!(boothowto & RB_ASKNAME)) 863 sbuf_printf(sb, ".ask\n"); 864 } 865 866 static int 867 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 868 { 869 static char buf[128]; 870 struct nameidata nd; 871 off_t ofs; 872 ssize_t resid; 873 int error, flags, len; 874 875 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 876 flags = FREAD; 877 error = vn_open(&nd, &flags, 0, NULL); 878 if (error) 879 return (error); 880 881 NDFREE(&nd, NDF_ONLY_PNBUF); 882 ofs = 0; 883 len = sizeof(buf) - 1; 884 while (1) { 885 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 886 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 887 NOCRED, &resid, td); 888 if (error) 889 break; 890 if (resid == len) 891 break; 892 buf[len - resid] = 0; 893 sbuf_printf(sb, "%s", buf); 894 ofs += len - resid; 895 } 896 897 VOP_UNLOCK(nd.ni_vp, 0); 898 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 899 return (error); 900 } 901 902 static void 903 vfs_mountroot_wait(void) 904 { 905 struct root_hold_token *h; 906 struct timeval lastfail; 907 int curfail; 908 909 curfail = 0; 910 while (1) { 911 DROP_GIANT(); 912 g_waitidle(); 913 PICKUP_GIANT(); 914 mtx_lock(&root_holds_mtx); 915 if (LIST_EMPTY(&root_holds)) { 916 mtx_unlock(&root_holds_mtx); 917 break; 918 } 919 if (ppsratecheck(&lastfail, &curfail, 1)) { 920 printf("Root mount waiting for:"); 921 LIST_FOREACH(h, &root_holds, list) 922 printf(" %s", h->who); 923 printf("\n"); 924 } 925 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 926 hz); 927 } 928 } 929 930 void 931 vfs_mountroot(void) 932 { 933 struct mount *mp; 934 struct sbuf *sb; 935 struct thread *td; 936 time_t timebase; 937 int error; 938 939 td = curthread; 940 941 vfs_mountroot_wait(); 942 943 sb = sbuf_new_auto(); 944 vfs_mountroot_conf0(sb); 945 sbuf_finish(sb); 946 947 error = vfs_mountroot_devfs(td, &mp); 948 while (!error) { 949 error = vfs_mountroot_parse(sb, mp); 950 if (!error) { 951 error = vfs_mountroot_shuffle(td, mp); 952 if (!error) { 953 sbuf_clear(sb); 954 error = vfs_mountroot_readconf(td, sb); 955 sbuf_finish(sb); 956 } 957 } 958 } 959 960 sbuf_delete(sb); 961 962 /* 963 * Iterate over all currently mounted file systems and use 964 * the time stamp found to check and/or initialize the RTC. 965 * Call inittodr() only once and pass it the largest of the 966 * timestamps we encounter. 967 */ 968 timebase = 0; 969 mtx_lock(&mountlist_mtx); 970 mp = TAILQ_FIRST(&mountlist); 971 while (mp != NULL) { 972 if (mp->mnt_time > timebase) 973 timebase = mp->mnt_time; 974 mp = TAILQ_NEXT(mp, mnt_list); 975 } 976 mtx_unlock(&mountlist_mtx); 977 inittodr(timebase); 978 979 /* Keep prison0's root in sync with the global rootvnode. */ 980 mtx_lock(&prison0.pr_mtx); 981 prison0.pr_root = rootvnode; 982 vref(prison0.pr_root); 983 mtx_unlock(&prison0.pr_mtx); 984 985 mtx_lock(&root_holds_mtx); 986 atomic_store_rel_int(&root_mount_complete, 1); 987 wakeup(&root_mount_complete); 988 mtx_unlock(&root_holds_mtx); 989 990 EVENTHANDLER_INVOKE(mountroot); 991 } 992 993 static struct mntarg * 994 parse_mountroot_options(struct mntarg *ma, const char *options) 995 { 996 char *p; 997 char *name, *name_arg; 998 char *val, *val_arg; 999 char *opts; 1000 1001 if (options == NULL || options[0] == '\0') 1002 return (ma); 1003 1004 p = opts = strdup(options, M_MOUNT); 1005 if (opts == NULL) { 1006 return (ma); 1007 } 1008 1009 while((name = strsep(&p, ",")) != NULL) { 1010 if (name[0] == '\0') 1011 break; 1012 1013 val = strchr(name, '='); 1014 if (val != NULL) { 1015 *val = '\0'; 1016 ++val; 1017 } 1018 if( strcmp(name, "rw") == 0 || 1019 strcmp(name, "noro") == 0) { 1020 /* 1021 * The first time we mount the root file system, 1022 * we need to mount 'ro', so We need to ignore 1023 * 'rw' and 'noro' mount options. 1024 */ 1025 continue; 1026 } 1027 name_arg = strdup(name, M_MOUNT); 1028 val_arg = NULL; 1029 if (val != NULL) 1030 val_arg = strdup(val, M_MOUNT); 1031 1032 ma = mount_arg(ma, name_arg, val_arg, 1033 (val_arg != NULL ? -1 : 0)); 1034 } 1035 free(opts, M_MOUNT); 1036 return (ma); 1037 }
Cache object: 8d4cecec12dcfd2d986b4324d5caf8c6
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