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.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
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.
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
38 #include "opt_rootdevname.h"
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
43 #include <sys/param.h>
46 #include <sys/fcntl.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>
56 #include <sys/filedesc.h>
57 #include <sys/reboot.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysproto.h>
63 #include <sys/sysctl.h>
64 #include <sys/sysent.h>
65 #include <sys/systm.h>
66 #include <sys/vnode.h>
68 #include <geom/geom.h>
71 * The root filesystem is detailed in the kernel environment variable
72 * vfs.root.mountfrom, which is expected to be in the general format
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
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.
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.
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 void vfs_mountroot_wait(void);
93 static int vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev);
96 * The vnode of the system's root (/ in the filesystem, without chroot
99 struct vnode *rootvnode;
102 * Mount of the system's /dev.
104 struct mount *rootdevmp;
106 char *rootdevnames[2] = {NULL, NULL};
108 struct mtx root_holds_mtx;
109 MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF);
111 struct root_hold_token {
113 LIST_ENTRY(root_hold_token) list;
116 static LIST_HEAD(, root_hold_token) root_holds =
117 LIST_HEAD_INITIALIZER(root_holds);
126 static enum action root_mount_onfail = A_CONTINUE;
128 static int root_mount_mddev;
129 static int root_mount_complete;
131 /* By default wait up to 3 seconds for devices to appear. */
132 static int root_mount_timeout = 3;
133 TUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout);
135 SYSCTL_PROC(_vfs, OID_AUTO, root_mount_hold,
136 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
137 NULL, 0, sysctl_vfs_root_mount_hold, "A",
138 "List of root mount hold tokens");
141 sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS)
144 struct root_hold_token *h;
147 sbuf_new(&sb, NULL, 256, SBUF_AUTOEXTEND | SBUF_INCLUDENUL);
149 mtx_lock(&root_holds_mtx);
150 LIST_FOREACH(h, &root_holds, list) {
151 if (h != LIST_FIRST(&root_holds))
153 sbuf_printf(&sb, "%s", h->who);
155 mtx_unlock(&root_holds_mtx);
157 error = sbuf_finish(&sb);
159 error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
164 struct root_hold_token *
165 root_mount_hold(const char *identifier)
167 struct root_hold_token *h;
172 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK);
174 mtx_lock(&root_holds_mtx);
175 LIST_INSERT_HEAD(&root_holds, h, list);
176 mtx_unlock(&root_holds_mtx);
181 root_mount_rel(struct root_hold_token *h)
186 mtx_lock(&root_holds_mtx);
187 LIST_REMOVE(h, list);
189 mtx_unlock(&root_holds_mtx);
197 /* No mutex is acquired here because int stores are atomic. */
198 return (root_mount_complete);
206 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode))
207 panic("Cannot find root vnode");
209 VOP_UNLOCK(rootvnode, 0);
211 p = curthread->td_proc;
212 FILEDESC_XLOCK(p->p_fd);
214 if (p->p_fd->fd_cdir != NULL)
215 vrele(p->p_fd->fd_cdir);
216 p->p_fd->fd_cdir = rootvnode;
219 if (p->p_fd->fd_rdir != NULL)
220 vrele(p->p_fd->fd_rdir);
221 p->p_fd->fd_rdir = rootvnode;
224 FILEDESC_XUNLOCK(p->p_fd);
228 vfs_mountroot_devfs(struct thread *td, struct mount **mpp)
230 struct vfsoptlist *opts;
231 struct vfsconf *vfsp;
237 if (rootdevmp != NULL) {
239 * Already have /dev; this happens during rerooting.
241 error = vfs_busy(rootdevmp, 0);
246 vfsp = vfs_byname("devfs");
247 KASSERT(vfsp != NULL, ("Could not find devfs by name"));
251 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred);
253 error = VFS_MOUNT(mp);
254 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error));
258 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
262 mtx_lock(&mountlist_mtx);
263 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
264 mtx_unlock(&mountlist_mtx);
272 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE);
274 printf("kern_symlink /dev -> / returns %d\n", error);
280 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs)
283 struct mount *mporoot, *mpnroot;
284 struct vnode *vp, *vporoot, *vpdevfs;
288 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list);
290 /* Shuffle the mountlist. */
291 mtx_lock(&mountlist_mtx);
292 mporoot = TAILQ_FIRST(&mountlist);
293 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list);
294 if (mporoot != mpdevfs) {
295 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list);
296 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list);
298 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list);
299 mtx_unlock(&mountlist_mtx);
301 cache_purgevfs(mporoot);
302 if (mporoot != mpdevfs)
303 cache_purgevfs(mpdevfs);
305 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot);
308 vporoot->v_iflag &= ~VI_MOUNT;
310 vporoot->v_mountedhere = NULL;
311 mporoot->mnt_flag &= ~MNT_ROOTFS;
312 mporoot->mnt_vnodecovered = NULL;
315 /* Set up the new rootvnode, and purge the cache */
316 mpnroot->mnt_vnodecovered = NULL;
318 cache_purgevfs(rootvnode->v_mount);
320 if (mporoot != mpdevfs) {
321 /* Remount old root under /.mount or /mnt */
323 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
327 NDFREE(&nd, NDF_ONLY_PNBUF);
329 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
335 error = (vp->v_type == VDIR) ? 0 : ENOTDIR;
337 error = vinvalbuf(vp, V_SAVE, 0, 0);
340 mporoot->mnt_vnodecovered = vp;
341 vp->v_mountedhere = mporoot;
342 strlcpy(mporoot->mnt_stat.f_mntonname,
348 NDFREE(&nd, NDF_ONLY_PNBUF);
350 if (error && bootverbose)
351 printf("mountroot: unable to remount previous root "
352 "under /.mount or /mnt (error %d).\n", error);
355 /* Remount devfs under /dev */
356 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td);
360 error = (vp->v_type == VDIR) ? 0 : ENOTDIR;
362 error = vinvalbuf(vp, V_SAVE, 0, 0);
364 vpdevfs = mpdevfs->mnt_vnodecovered;
365 if (vpdevfs != NULL) {
366 cache_purge(vpdevfs);
367 vpdevfs->v_mountedhere = NULL;
370 mpdevfs->mnt_vnodecovered = vp;
371 vp->v_mountedhere = mpdevfs;
376 if (error && bootverbose)
377 printf("mountroot: unable to remount devfs under /dev "
378 "(error %d).\n", error);
379 NDFREE(&nd, NDF_ONLY_PNBUF);
381 if (mporoot == mpdevfs) {
383 /* Unlink the no longer needed /dev/dev -> / symlink */
384 error = kern_unlinkat(td, AT_FDCWD, "/dev/dev",
386 if (error && bootverbose)
387 printf("mountroot: unable to unlink /dev/dev "
388 "(error %d)\n", error);
393 * Configuration parser.
396 /* Parser character classes. */
397 #define CC_WHITESPACE -1
398 #define CC_NONWHITESPACE -2
405 parse_peek(char **conf)
412 parse_poke(char **conf, int c)
419 parse_advance(char **conf)
426 parse_skipto(char **conf, int mc)
431 c = parse_peek(conf);
436 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0;
438 case CC_NONWHITESPACE:
441 match = (c != ' ' && c != '\t') ? 1 : 0;
444 match = (c == mc) ? 1 : 0;
455 parse_token(char **conf, char **tok)
462 error = parse_skipto(conf, CC_NONWHITESPACE);
466 error = parse_skipto(conf, CC_WHITESPACE);
468 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO);
474 parse_dir_ask_printenv(const char *var)
478 val = kern_getenv(var);
480 printf(" %s=%s\n", var, val);
486 parse_dir_ask(char **conf)
492 vfs_mountroot_wait();
494 printf("\nLoader variables:\n");
495 parse_dir_ask_printenv("vfs.root.mountfrom");
496 parse_dir_ask_printenv("vfs.root.mountfrom.options");
498 printf("\nManual root filesystem specification:\n");
499 printf(" <fstype>:<device> [options]\n");
500 printf(" Mount <device> using filesystem <fstype>\n");
501 printf(" and with the specified (optional) option list.\n");
503 printf(" eg. ufs:/dev/da0s1a\n");
504 printf(" zfs:tank\n");
505 printf(" cd9660:/dev/cd0 ro\n");
506 printf(" (which is equivalent to: ");
507 printf("mount -t cd9660 -o ro /dev/cd0 /)\n");
509 printf(" ? List valid disk boot devices\n");
510 printf(" . Yield 1 second (for background tasks)\n");
511 printf(" <empty line> Abort manual input\n");
515 printf("\nmountroot> ");
516 cngets(name, sizeof(name), GETS_ECHO);
519 if (name[0] == '?' && name[1] == '\0') {
520 printf("\nList of GEOM managed disk devices:\n ");
524 if (name[0] == '.' && name[1] == '\0') {
529 error = parse_mount(&mnt);
531 printf("Invalid file system specification.\n");
532 } while (error != 0);
538 parse_dir_md(char **conf)
542 struct md_ioctl *mdio;
548 error = parse_token(conf, &tok);
553 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO);
554 path = (void *)(mdio + 1);
555 bcopy(tok, path, len);
558 /* Get file status. */
559 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL);
563 /* Open /dev/mdctl so that we can attach/detach. */
564 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE,
569 fd = td->td_retval[0];
570 mdio->md_version = MDIOVERSION;
571 mdio->md_type = MD_VNODE;
573 if (root_mount_mddev != -1) {
574 mdio->md_unit = root_mount_mddev;
576 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);
578 /* Ignore errors. We don't care. */
579 root_mount_mddev = -1;
582 mdio->md_file = (void *)(mdio + 1);
583 mdio->md_options = MD_AUTOUNIT | MD_READONLY;
584 mdio->md_mediasize = sb.st_size;
587 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio);
592 if (mdio->md_unit > 9) {
593 printf("rootmount: too many md units\n");
594 mdio->md_file = NULL;
595 mdio->md_options = 0;
596 mdio->md_mediasize = 0;
598 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);
600 /* Ignore errors. We don't care. */
605 root_mount_mddev = mdio->md_unit;
606 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file);
608 error = kern_close(td, fd);
616 parse_dir_onfail(char **conf)
621 error = parse_token(conf, &action);
625 if (!strcmp(action, "continue"))
626 root_mount_onfail = A_CONTINUE;
627 else if (!strcmp(action, "panic"))
628 root_mount_onfail = A_PANIC;
629 else if (!strcmp(action, "reboot"))
630 root_mount_onfail = A_REBOOT;
631 else if (!strcmp(action, "retry"))
632 root_mount_onfail = A_RETRY;
634 printf("rootmount: %s: unknown action\n", action);
638 free(action, M_TEMP);
643 parse_dir_timeout(char **conf)
649 error = parse_token(conf, &tok);
653 secs = strtol(tok, &endtok, 0);
654 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0;
656 root_mount_timeout = secs;
662 parse_directive(char **conf)
667 error = parse_token(conf, &dir);
671 if (strcmp(dir, ".ask") == 0)
672 error = parse_dir_ask(conf);
673 else if (strcmp(dir, ".md") == 0)
674 error = parse_dir_md(conf);
675 else if (strcmp(dir, ".onfail") == 0)
676 error = parse_dir_onfail(conf);
677 else if (strcmp(dir, ".timeout") == 0)
678 error = parse_dir_timeout(conf);
680 printf("mountroot: invalid directive `%s'\n", dir);
681 /* Ignore the rest of the line. */
682 (void)parse_skipto(conf, '\n');
690 parse_mount_dev_present(const char *dev)
695 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread);
699 NDFREE(&nd, NDF_ONLY_PNBUF);
700 return (error != 0) ? 0 : 1;
705 parse_mount(char **conf)
709 char *dev, *fs, *opts, *tok;
712 error = parse_token(conf, &tok);
716 error = parse_skipto(&tok, ':');
721 parse_poke(&tok, '\0');
725 if (root_mount_mddev != -1) {
726 /* Handle substitution for the md unit number. */
727 tok = strstr(dev, "md#");
729 tok[2] = '0' + root_mount_mddev;
733 error = parse_token(conf, &tok);
734 opts = (error == 0) ? tok : NULL;
736 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev,
737 (opts != NULL) ? opts : "");
739 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO);
741 if (vfs_byname(fs) == NULL) {
742 strlcpy(errmsg, "unknown file system", ERRMSGL);
747 error = vfs_mountroot_wait_if_neccessary(fs, dev);
752 ma = mount_arg(ma, "fstype", fs, -1);
753 ma = mount_arg(ma, "fspath", "/", -1);
754 ma = mount_arg(ma, "from", dev, -1);
755 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL);
756 ma = mount_arg(ma, "ro", NULL, 0);
757 ma = parse_mountroot_options(ma, opts);
758 error = kernel_mount(ma, MNT_ROOTFS);
762 printf("Mounting from %s:%s failed with error %d",
764 if (errmsg[0] != '\0')
765 printf(": %s", errmsg);
769 free(errmsg, M_TEMP);
772 /* kernel_mount can return -1 on error. */
773 return ((error < 0) ? EDOOFUS : error);
778 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs)
784 root_mount_mddev = -1;
787 conf = sbuf_data(sb);
788 mp = TAILQ_NEXT(mpdevfs, mnt_list);
789 error = (mp == NULL) ? 0 : EDOOFUS;
790 root_mount_onfail = A_CONTINUE;
792 error = parse_skipto(&conf, CC_NONWHITESPACE);
793 if (error == PE_EOL) {
794 parse_advance(&conf);
799 switch (parse_peek(&conf)) {
801 error = parse_skipto(&conf, '\n');
804 error = parse_directive(&conf);
807 error = parse_mount(&conf);
809 printf("mountroot: invalid file system "
817 /* Ignore any trailing garbage on the line. */
818 if (parse_peek(&conf) != '\n') {
819 printf("mountroot: advancing to next directive...\n");
820 (void)parse_skipto(&conf, '\n');
822 mp = TAILQ_NEXT(mpdevfs, mnt_list);
828 * We failed to mount (a new) root.
830 switch (root_mount_onfail) {
834 panic("mountroot: unable to (re-)mount root.");
839 kern_reboot(RB_NOSYNC);
847 vfs_mountroot_conf0(struct sbuf *sb)
849 char *s, *tok, *mnt, *opt;
852 sbuf_printf(sb, ".onfail panic\n");
853 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout);
854 if (boothowto & RB_ASKNAME)
855 sbuf_printf(sb, ".ask\n");
857 if (boothowto & RB_DFLTROOT)
858 sbuf_printf(sb, "%s\n", ROOTDEVNAME);
860 if (boothowto & RB_CDROM) {
861 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n");
862 sbuf_printf(sb, ".timeout 0\n");
863 sbuf_printf(sb, "cd9660:/dev/cd1 ro\n");
864 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout);
866 s = kern_getenv("vfs.root.mountfrom");
868 opt = kern_getenv("vfs.root.mountfrom.options");
870 error = parse_token(&tok, &mnt);
872 sbuf_printf(sb, "%s %s\n", mnt,
873 (opt != NULL) ? opt : "");
875 error = parse_token(&tok, &mnt);
881 if (rootdevnames[0] != NULL)
882 sbuf_printf(sb, "%s\n", rootdevnames[0]);
883 if (rootdevnames[1] != NULL)
884 sbuf_printf(sb, "%s\n", rootdevnames[1]);
886 if (!(boothowto & RB_DFLTROOT))
887 sbuf_printf(sb, "%s\n", ROOTDEVNAME);
889 if (!(boothowto & RB_ASKNAME))
890 sbuf_printf(sb, ".ask\n");
894 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb)
896 static char buf[128];
900 int error, flags, len;
902 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td);
904 error = vn_open(&nd, &flags, 0, NULL);
908 NDFREE(&nd, NDF_ONLY_PNBUF);
910 len = sizeof(buf) - 1;
912 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs,
913 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
919 buf[len - resid] = 0;
920 sbuf_printf(sb, "%s", buf);
924 VOP_UNLOCK(nd.ni_vp, 0);
925 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
930 vfs_mountroot_wait(void)
932 struct root_hold_token *h;
933 struct timeval lastfail;
941 mtx_lock(&root_holds_mtx);
942 if (LIST_EMPTY(&root_holds)) {
943 mtx_unlock(&root_holds_mtx);
946 if (ppsratecheck(&lastfail, &curfail, 1)) {
947 printf("Root mount waiting for:");
948 LIST_FOREACH(h, &root_holds, list)
949 printf(" %s", h->who);
952 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold",
958 vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev)
963 * In case of ZFS and NFS we don't have a way to wait for
966 if (strcmp(fs, "zfs") == 0 || strstr(fs, "nfs") != NULL ||
968 vfs_mountroot_wait();
973 * Otherwise, no point in waiting if the device is already there.
974 * Note that we must wait for GEOM to finish reconfiguring itself,
975 * eg for geom_part(4) to finish tasting.
980 if (parse_mount_dev_present(dev))
984 * No luck. Let's wait. This code looks weird, but it's that way
985 * to behave exactly as it used to work before.
987 vfs_mountroot_wait();
988 printf("mountroot: waiting for device %s...\n", dev);
990 timeout = root_mount_timeout * hz;
992 pause("rmdev", delay);
994 } while (timeout > 0 && !parse_mount_dev_present(dev));
1013 sb = sbuf_new_auto();
1014 vfs_mountroot_conf0(sb);
1017 error = vfs_mountroot_devfs(td, &mp);
1019 error = vfs_mountroot_parse(sb, mp);
1021 vfs_mountroot_shuffle(td, mp);
1023 error = vfs_mountroot_readconf(td, sb);
1031 * Iterate over all currently mounted file systems and use
1032 * the time stamp found to check and/or initialize the RTC.
1033 * Call inittodr() only once and pass it the largest of the
1034 * timestamps we encounter.
1037 mtx_lock(&mountlist_mtx);
1038 mp = TAILQ_FIRST(&mountlist);
1039 while (mp != NULL) {
1040 if (mp->mnt_time > timebase)
1041 timebase = mp->mnt_time;
1042 mp = TAILQ_NEXT(mp, mnt_list);
1044 mtx_unlock(&mountlist_mtx);
1047 /* Keep prison0's root in sync with the global rootvnode. */
1048 mtx_lock(&prison0.pr_mtx);
1049 prison0.pr_root = rootvnode;
1050 vref(prison0.pr_root);
1051 mtx_unlock(&prison0.pr_mtx);
1053 mtx_lock(&root_holds_mtx);
1054 atomic_store_rel_int(&root_mount_complete, 1);
1055 wakeup(&root_mount_complete);
1056 mtx_unlock(&root_holds_mtx);
1058 EVENTHANDLER_INVOKE(mountroot);
1061 static struct mntarg *
1062 parse_mountroot_options(struct mntarg *ma, const char *options)
1065 char *name, *name_arg;
1066 char *val, *val_arg;
1069 if (options == NULL || options[0] == '\0')
1072 p = opts = strdup(options, M_MOUNT);
1077 while((name = strsep(&p, ",")) != NULL) {
1078 if (name[0] == '\0')
1081 val = strchr(name, '=');
1086 if( strcmp(name, "rw") == 0 ||
1087 strcmp(name, "noro") == 0) {
1089 * The first time we mount the root file system,
1090 * we need to mount 'ro', so We need to ignore
1091 * 'rw' and 'noro' mount options.
1095 name_arg = strdup(name, M_MOUNT);
1098 val_arg = strdup(val, M_MOUNT);
1100 ma = mount_arg(ma, name_arg, val_arg,
1101 (val_arg != NULL ? -1 : 0));
1103 free(opts, M_MOUNT);