2 * SPDX-License-Identifier: BSD-3-Clause
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.
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
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.
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
40 #include "opt_rootdevname.h"
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
45 #include <sys/param.h>
48 #include <sys/eventhandler.h>
49 #include <sys/fcntl.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>
59 #include <sys/filedesc.h>
60 #include <sys/reboot.h>
63 #include <sys/syscallsubr.h>
64 #include <sys/sysproto.h>
66 #include <sys/sysctl.h>
67 #include <sys/sysent.h>
68 #include <sys/systm.h>
69 #include <sys/vnode.h>
71 #include <geom/geom.h>
74 * The root filesystem is detailed in the kernel environment variable
75 * vfs.root.mountfrom, which is expected to be in the general format
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
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.
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.
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);
99 * The vnode of the system's root (/ in the filesystem, without chroot
102 struct vnode *rootvnode;
105 * Mount of the system's /dev.
107 struct mount *rootdevmp;
109 char *rootdevnames[2] = {NULL, NULL};
111 struct mtx root_holds_mtx;
112 MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF);
114 struct root_hold_token {
116 LIST_ENTRY(root_hold_token) list;
119 static LIST_HEAD(, root_hold_token) root_holds =
120 LIST_HEAD_INITIALIZER(root_holds);
129 static enum action root_mount_onfail = A_CONTINUE;
131 static int root_mount_mddev;
132 static int root_mount_complete;
134 /* By default wait up to 3 seconds for devices to appear. */
135 static int root_mount_timeout = 3;
136 TUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout);
138 static int root_mount_always_wait = 0;
139 SYSCTL_INT(_vfs, OID_AUTO, root_mount_always_wait, CTLFLAG_RDTUN,
140 &root_mount_always_wait, 0,
141 "Wait for root mount holds even if the root device already exists");
143 SYSCTL_PROC(_vfs, OID_AUTO, root_mount_hold,
144 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
145 NULL, 0, sysctl_vfs_root_mount_hold, "A",
146 "List of root mount hold tokens");
149 sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS)
152 struct root_hold_token *h;
155 sbuf_new(&sb, NULL, 256, SBUF_AUTOEXTEND | SBUF_INCLUDENUL);
157 mtx_lock(&root_holds_mtx);
158 LIST_FOREACH(h, &root_holds, list) {
159 if (h != LIST_FIRST(&root_holds))
161 sbuf_printf(&sb, "%s", h->who);
163 mtx_unlock(&root_holds_mtx);
165 error = sbuf_finish(&sb);
167 error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
172 struct root_hold_token *
173 root_mount_hold(const char *identifier)
175 struct root_hold_token *h;
177 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK);
179 mtx_lock(&root_holds_mtx);
180 TSHOLD("root mount");
181 LIST_INSERT_HEAD(&root_holds, h, list);
182 mtx_unlock(&root_holds_mtx);
187 root_mount_rel(struct root_hold_token *h)
193 mtx_lock(&root_holds_mtx);
194 LIST_REMOVE(h, list);
195 TSRELEASE("root mount");
197 mtx_unlock(&root_holds_mtx);
205 /* No mutex is acquired here because int stores are atomic. */
206 return (root_mount_complete);
214 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode))
215 panic("set_rootvnode: Cannot find root vnode");
217 VOP_UNLOCK(rootvnode, 0);
219 p = curthread->td_proc;
220 FILEDESC_XLOCK(p->p_fd);
222 if (p->p_fd->fd_cdir != NULL)
223 vrele(p->p_fd->fd_cdir);
224 p->p_fd->fd_cdir = rootvnode;
227 if (p->p_fd->fd_rdir != NULL)
228 vrele(p->p_fd->fd_rdir);
229 p->p_fd->fd_rdir = rootvnode;
232 FILEDESC_XUNLOCK(p->p_fd);
236 vfs_mountroot_devfs(struct thread *td, struct mount **mpp)
238 struct vfsoptlist *opts;
239 struct vfsconf *vfsp;
245 if (rootdevmp != NULL) {
247 * Already have /dev; this happens during rerooting.
249 error = vfs_busy(rootdevmp, 0);
254 vfsp = vfs_byname("devfs");
255 KASSERT(vfsp != NULL, ("Could not find devfs by name"));
259 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred);
261 error = VFS_MOUNT(mp);
262 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error));
266 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
270 mtx_lock(&mountlist_mtx);
271 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
272 mtx_unlock(&mountlist_mtx);
281 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE);
283 printf("kern_symlink /dev -> / returns %d\n", error);
289 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs)
292 struct mount *mporoot, *mpnroot;
293 struct vnode *vp, *vporoot, *vpdevfs;
297 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list);
299 /* Shuffle the mountlist. */
300 mtx_lock(&mountlist_mtx);
301 mporoot = TAILQ_FIRST(&mountlist);
302 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list);
303 if (mporoot != mpdevfs) {
304 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list);
305 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list);
307 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list);
308 mtx_unlock(&mountlist_mtx);
310 cache_purgevfs(mporoot, true);
311 if (mporoot != mpdevfs)
312 cache_purgevfs(mpdevfs, true);
314 if (VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot))
315 panic("vfs_mountroot_shuffle: Cannot find root vnode");
318 vporoot->v_iflag &= ~VI_MOUNT;
320 vporoot->v_mountedhere = NULL;
321 mporoot->mnt_flag &= ~MNT_ROOTFS;
322 mporoot->mnt_vnodecovered = NULL;
325 /* Set up the new rootvnode, and purge the cache */
326 mpnroot->mnt_vnodecovered = NULL;
328 cache_purgevfs(rootvnode->v_mount, true);
330 if (mporoot != mpdevfs) {
331 /* Remount old root under /.mount or /mnt */
333 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
337 NDFREE(&nd, NDF_ONLY_PNBUF);
339 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
345 error = (vp->v_type == VDIR) ? 0 : ENOTDIR;
347 error = vinvalbuf(vp, V_SAVE, 0, 0);
350 mporoot->mnt_vnodecovered = vp;
351 vp->v_mountedhere = mporoot;
352 strlcpy(mporoot->mnt_stat.f_mntonname,
358 NDFREE(&nd, NDF_ONLY_PNBUF);
361 printf("mountroot: unable to remount previous root "
362 "under /.mount or /mnt (error %d)\n", error);
365 /* Remount devfs under /dev */
366 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td);
370 error = (vp->v_type == VDIR) ? 0 : ENOTDIR;
372 error = vinvalbuf(vp, V_SAVE, 0, 0);
374 vpdevfs = mpdevfs->mnt_vnodecovered;
375 if (vpdevfs != NULL) {
376 cache_purge(vpdevfs);
377 vpdevfs->v_mountedhere = NULL;
380 mpdevfs->mnt_vnodecovered = vp;
381 vp->v_mountedhere = mpdevfs;
387 printf("mountroot: unable to remount devfs under /dev "
388 "(error %d)\n", error);
389 NDFREE(&nd, NDF_ONLY_PNBUF);
391 if (mporoot == mpdevfs) {
393 /* Unlink the no longer needed /dev/dev -> / symlink */
394 error = kern_funlinkat(td, AT_FDCWD, "/dev/dev", FD_NONE,
397 printf("mountroot: unable to unlink /dev/dev "
398 "(error %d)\n", error);
403 * Configuration parser.
406 /* Parser character classes. */
407 #define CC_WHITESPACE -1
408 #define CC_NONWHITESPACE -2
415 parse_peek(char **conf)
422 parse_poke(char **conf, int c)
429 parse_advance(char **conf)
436 parse_skipto(char **conf, int mc)
441 c = parse_peek(conf);
446 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0;
448 case CC_NONWHITESPACE:
451 match = (c != ' ' && c != '\t') ? 1 : 0;
454 match = (c == mc) ? 1 : 0;
465 parse_token(char **conf, char **tok)
472 error = parse_skipto(conf, CC_NONWHITESPACE);
476 error = parse_skipto(conf, CC_WHITESPACE);
478 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO);
484 parse_dir_ask_printenv(const char *var)
488 val = kern_getenv(var);
490 printf(" %s=%s\n", var, val);
496 parse_dir_ask(char **conf)
502 vfs_mountroot_wait();
504 printf("\nLoader variables:\n");
505 parse_dir_ask_printenv("vfs.root.mountfrom");
506 parse_dir_ask_printenv("vfs.root.mountfrom.options");
508 printf("\nManual root filesystem specification:\n");
509 printf(" <fstype>:<device> [options]\n");
510 printf(" Mount <device> using filesystem <fstype>\n");
511 printf(" and with the specified (optional) option list.\n");
513 printf(" eg. ufs:/dev/da0s1a\n");
514 printf(" zfs:zroot/ROOT/default\n");
515 printf(" cd9660:/dev/cd0 ro\n");
516 printf(" (which is equivalent to: ");
517 printf("mount -t cd9660 -o ro /dev/cd0 /)\n");
519 printf(" ? List valid disk boot devices\n");
520 printf(" . Yield 1 second (for background tasks)\n");
521 printf(" <empty line> Abort manual input\n");
525 printf("\nmountroot> ");
526 cngets(name, sizeof(name), GETS_ECHO);
529 if (name[0] == '?' && name[1] == '\0') {
530 printf("\nList of GEOM managed disk devices:\n ");
534 if (name[0] == '.' && name[1] == '\0') {
539 error = parse_mount(&mnt);
541 printf("Invalid file system specification.\n");
542 } while (error != 0);
548 parse_dir_md(char **conf)
552 struct md_ioctl *mdio;
558 error = parse_token(conf, &tok);
563 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO);
564 path = (void *)(mdio + 1);
565 bcopy(tok, path, len);
568 /* Get file status. */
569 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL);
573 /* Open /dev/mdctl so that we can attach/detach. */
574 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE,
579 fd = td->td_retval[0];
580 mdio->md_version = MDIOVERSION;
581 mdio->md_type = MD_VNODE;
583 if (root_mount_mddev != -1) {
584 mdio->md_unit = root_mount_mddev;
585 (void)kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);
586 /* Ignore errors. We don't care. */
587 root_mount_mddev = -1;
590 mdio->md_file = (void *)(mdio + 1);
591 mdio->md_options = MD_AUTOUNIT | MD_READONLY;
592 mdio->md_mediasize = sb.st_size;
594 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio);
598 if (mdio->md_unit > 9) {
599 printf("rootmount: too many md units\n");
600 mdio->md_file = NULL;
601 mdio->md_options = 0;
602 mdio->md_mediasize = 0;
603 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);
604 /* Ignore errors. We don't care. */
609 root_mount_mddev = mdio->md_unit;
610 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file);
612 error = kern_close(td, fd);
620 parse_dir_onfail(char **conf)
625 error = parse_token(conf, &action);
629 if (!strcmp(action, "continue"))
630 root_mount_onfail = A_CONTINUE;
631 else if (!strcmp(action, "panic"))
632 root_mount_onfail = A_PANIC;
633 else if (!strcmp(action, "reboot"))
634 root_mount_onfail = A_REBOOT;
635 else if (!strcmp(action, "retry"))
636 root_mount_onfail = A_RETRY;
638 printf("rootmount: %s: unknown action\n", action);
642 free(action, M_TEMP);
647 parse_dir_timeout(char **conf)
653 error = parse_token(conf, &tok);
657 secs = strtol(tok, &endtok, 0);
658 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0;
660 root_mount_timeout = secs;
666 parse_directive(char **conf)
671 error = parse_token(conf, &dir);
675 if (strcmp(dir, ".ask") == 0)
676 error = parse_dir_ask(conf);
677 else if (strcmp(dir, ".md") == 0)
678 error = parse_dir_md(conf);
679 else if (strcmp(dir, ".onfail") == 0)
680 error = parse_dir_onfail(conf);
681 else if (strcmp(dir, ".timeout") == 0)
682 error = parse_dir_timeout(conf);
684 printf("mountroot: invalid directive `%s'\n", dir);
685 /* Ignore the rest of the line. */
686 (void)parse_skipto(conf, '\n');
694 parse_mount_dev_present(const char *dev)
699 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread);
703 NDFREE(&nd, NDF_ONLY_PNBUF);
704 return (error != 0) ? 0 : 1;
709 parse_mount(char **conf)
713 char *dev, *fs, *opts, *tok;
714 int delay, error, timeout;
716 error = parse_token(conf, &tok);
720 error = parse_skipto(&tok, ':');
725 parse_poke(&tok, '\0');
729 if (root_mount_mddev != -1) {
730 /* Handle substitution for the md unit number. */
731 tok = strstr(dev, "md#");
733 tok[2] = '0' + root_mount_mddev;
737 error = parse_token(conf, &tok);
738 opts = (error == 0) ? tok : NULL;
740 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev,
741 (opts != NULL) ? opts : "");
743 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO);
745 if (vfs_byname(fs) == NULL) {
746 strlcpy(errmsg, "unknown file system", ERRMSGL);
751 error = vfs_mountroot_wait_if_neccessary(fs, dev);
756 timeout = root_mount_timeout * hz;
760 ma = mount_arg(ma, "fstype", fs, -1);
761 ma = mount_arg(ma, "fspath", "/", -1);
762 ma = mount_arg(ma, "from", dev, -1);
763 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL);
764 ma = mount_arg(ma, "ro", NULL, 0);
765 ma = parse_mountroot_options(ma, opts);
767 error = kernel_mount(ma, MNT_ROOTFS);
768 if (error == 0 || timeout <= 0)
771 if (root_mount_timeout * hz == timeout ||
772 (bootverbose && timeout % hz == 0)) {
773 printf("Mounting from %s:%s failed with error %d; "
774 "retrying for %d more second%s\n", fs, dev, error,
775 timeout / hz, (timeout / hz > 1) ? "s" : "");
777 pause("rmretry", delay);
782 printf("Mounting from %s:%s failed with error %d",
784 if (errmsg[0] != '\0')
785 printf(": %s", errmsg);
789 free(errmsg, M_TEMP);
792 /* kernel_mount can return -1 on error. */
793 return ((error < 0) ? EDOOFUS : error);
798 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs)
804 root_mount_mddev = -1;
807 conf = sbuf_data(sb);
808 mp = TAILQ_NEXT(mpdevfs, mnt_list);
809 error = (mp == NULL) ? 0 : EDOOFUS;
810 root_mount_onfail = A_CONTINUE;
812 error = parse_skipto(&conf, CC_NONWHITESPACE);
813 if (error == PE_EOL) {
814 parse_advance(&conf);
819 switch (parse_peek(&conf)) {
821 error = parse_skipto(&conf, '\n');
824 error = parse_directive(&conf);
827 error = parse_mount(&conf);
829 printf("mountroot: invalid file system "
837 /* Ignore any trailing garbage on the line. */
838 if (parse_peek(&conf) != '\n') {
839 printf("mountroot: advancing to next directive...\n");
840 (void)parse_skipto(&conf, '\n');
842 mp = TAILQ_NEXT(mpdevfs, mnt_list);
848 * We failed to mount (a new) root.
850 switch (root_mount_onfail) {
854 panic("mountroot: unable to (re-)mount root.");
859 kern_reboot(RB_NOSYNC);
867 vfs_mountroot_conf0(struct sbuf *sb)
869 char *s, *tok, *mnt, *opt;
872 sbuf_printf(sb, ".onfail panic\n");
873 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout);
874 if (boothowto & RB_ASKNAME)
875 sbuf_printf(sb, ".ask\n");
877 if (boothowto & RB_DFLTROOT)
878 sbuf_printf(sb, "%s\n", ROOTDEVNAME);
880 if (boothowto & RB_CDROM) {
881 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n");
882 sbuf_printf(sb, ".timeout 0\n");
883 sbuf_printf(sb, "cd9660:/dev/cd1 ro\n");
884 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout);
886 s = kern_getenv("vfs.root.mountfrom");
888 opt = kern_getenv("vfs.root.mountfrom.options");
890 error = parse_token(&tok, &mnt);
892 sbuf_printf(sb, "%s %s\n", mnt,
893 (opt != NULL) ? opt : "");
895 error = parse_token(&tok, &mnt);
901 if (rootdevnames[0] != NULL)
902 sbuf_printf(sb, "%s\n", rootdevnames[0]);
903 if (rootdevnames[1] != NULL)
904 sbuf_printf(sb, "%s\n", rootdevnames[1]);
906 if (!(boothowto & RB_DFLTROOT))
907 sbuf_printf(sb, "%s\n", ROOTDEVNAME);
909 if (!(boothowto & RB_ASKNAME))
910 sbuf_printf(sb, ".ask\n");
914 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb)
916 static char buf[128];
920 int error, flags, len;
922 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td);
924 error = vn_open(&nd, &flags, 0, NULL);
928 NDFREE(&nd, NDF_ONLY_PNBUF);
930 len = sizeof(buf) - 1;
932 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs,
933 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
939 buf[len - resid] = 0;
940 sbuf_printf(sb, "%s", buf);
944 VOP_UNLOCK(nd.ni_vp, 0);
945 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
950 vfs_mountroot_wait(void)
952 struct root_hold_token *h;
953 struct timeval lastfail;
961 mtx_lock(&root_holds_mtx);
962 if (LIST_EMPTY(&root_holds)) {
963 mtx_unlock(&root_holds_mtx);
966 if (ppsratecheck(&lastfail, &curfail, 1)) {
967 printf("Root mount waiting for:");
968 LIST_FOREACH(h, &root_holds, list)
969 printf(" %s", h->who);
972 TSWAIT("root mount");
973 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold",
975 TSUNWAIT("root mount");
982 vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev)
987 * In case of ZFS and NFS we don't have a way to wait for
988 * specific device. Also do the wait if the user forced that
989 * behaviour by setting vfs.root_mount_always_wait=1.
991 if (strcmp(fs, "zfs") == 0 || strstr(fs, "nfs") != NULL ||
992 dev[0] == '\0' || root_mount_always_wait != 0) {
993 vfs_mountroot_wait();
998 * Otherwise, no point in waiting if the device is already there.
999 * Note that we must wait for GEOM to finish reconfiguring itself,
1000 * eg for geom_part(4) to finish tasting.
1003 if (parse_mount_dev_present(dev))
1007 * No luck. Let's wait. This code looks weird, but it's that way
1008 * to behave exactly as it used to work before.
1010 vfs_mountroot_wait();
1011 printf("mountroot: waiting for device %s...\n", dev);
1013 timeout = root_mount_timeout * hz;
1015 pause("rmdev", delay);
1017 } while (timeout > 0 && !parse_mount_dev_present(dev));
1034 mtx_assert(&Giant, MA_NOTOWNED);
1040 sb = sbuf_new_auto();
1041 vfs_mountroot_conf0(sb);
1044 error = vfs_mountroot_devfs(td, &mp);
1046 error = vfs_mountroot_parse(sb, mp);
1048 vfs_mountroot_shuffle(td, mp);
1050 error = vfs_mountroot_readconf(td, sb);
1058 * Iterate over all currently mounted file systems and use
1059 * the time stamp found to check and/or initialize the RTC.
1060 * Call inittodr() only once and pass it the largest of the
1061 * timestamps we encounter.
1064 mtx_lock(&mountlist_mtx);
1065 mp = TAILQ_FIRST(&mountlist);
1066 while (mp != NULL) {
1067 if (mp->mnt_time > timebase)
1068 timebase = mp->mnt_time;
1069 mp = TAILQ_NEXT(mp, mnt_list);
1071 mtx_unlock(&mountlist_mtx);
1074 /* Keep prison0's root in sync with the global rootvnode. */
1075 mtx_lock(&prison0.pr_mtx);
1076 prison0.pr_root = rootvnode;
1077 vref(prison0.pr_root);
1078 mtx_unlock(&prison0.pr_mtx);
1080 mtx_lock(&root_holds_mtx);
1081 atomic_store_rel_int(&root_mount_complete, 1);
1082 wakeup(&root_mount_complete);
1083 mtx_unlock(&root_holds_mtx);
1085 EVENTHANDLER_INVOKE(mountroot);
1090 static struct mntarg *
1091 parse_mountroot_options(struct mntarg *ma, const char *options)
1094 char *name, *name_arg;
1095 char *val, *val_arg;
1098 if (options == NULL || options[0] == '\0')
1101 p = opts = strdup(options, M_MOUNT);
1106 while((name = strsep(&p, ",")) != NULL) {
1107 if (name[0] == '\0')
1110 val = strchr(name, '=');
1115 if( strcmp(name, "rw") == 0 ||
1116 strcmp(name, "noro") == 0) {
1118 * The first time we mount the root file system,
1119 * we need to mount 'ro', so We need to ignore
1120 * 'rw' and 'noro' mount options.
1124 name_arg = strdup(name, M_MOUNT);
1127 val_arg = strdup(val, M_MOUNT);
1129 ma = mount_arg(ma, name_arg, val_arg,
1130 (val_arg != NULL ? -1 : 0));
1132 free(opts, M_MOUNT);