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 int vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev);
95 * The vnode of the system's root (/ in the filesystem, without chroot
98 struct vnode *rootvnode;
101 * Mount of the system's /dev.
103 struct mount *rootdevmp;
105 char *rootdevnames[2] = {NULL, NULL};
107 struct mtx root_holds_mtx;
108 MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF);
110 struct root_hold_token {
112 LIST_ENTRY(root_hold_token) list;
115 static LIST_HEAD(, root_hold_token) root_holds =
116 LIST_HEAD_INITIALIZER(root_holds);
125 static enum action root_mount_onfail = A_CONTINUE;
127 static int root_mount_mddev;
128 static int root_mount_complete;
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);
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");
140 sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS)
143 struct root_hold_token *h;
146 sbuf_new(&sb, NULL, 256, SBUF_AUTOEXTEND | SBUF_INCLUDENUL);
148 mtx_lock(&root_holds_mtx);
149 LIST_FOREACH(h, &root_holds, list) {
150 if (h != LIST_FIRST(&root_holds))
152 sbuf_printf(&sb, "%s", h->who);
154 mtx_unlock(&root_holds_mtx);
156 error = sbuf_finish(&sb);
158 error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
163 struct root_hold_token *
164 root_mount_hold(const char *identifier)
166 struct root_hold_token *h;
171 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK);
173 mtx_lock(&root_holds_mtx);
174 LIST_INSERT_HEAD(&root_holds, h, list);
175 mtx_unlock(&root_holds_mtx);
180 root_mount_rel(struct root_hold_token *h)
185 mtx_lock(&root_holds_mtx);
186 LIST_REMOVE(h, list);
188 mtx_unlock(&root_holds_mtx);
196 /* No mutex is acquired here because int stores are atomic. */
197 return (root_mount_complete);
205 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode))
206 panic("Cannot find root vnode");
208 VOP_UNLOCK(rootvnode, 0);
210 p = curthread->td_proc;
211 FILEDESC_XLOCK(p->p_fd);
213 if (p->p_fd->fd_cdir != NULL)
214 vrele(p->p_fd->fd_cdir);
215 p->p_fd->fd_cdir = rootvnode;
218 if (p->p_fd->fd_rdir != NULL)
219 vrele(p->p_fd->fd_rdir);
220 p->p_fd->fd_rdir = rootvnode;
223 FILEDESC_XUNLOCK(p->p_fd);
227 vfs_mountroot_devfs(struct thread *td, struct mount **mpp)
229 struct vfsoptlist *opts;
230 struct vfsconf *vfsp;
236 if (rootdevmp != NULL) {
238 * Already have /dev; this happens during rerooting.
240 error = vfs_busy(rootdevmp, 0);
245 vfsp = vfs_byname("devfs");
246 KASSERT(vfsp != NULL, ("Could not find devfs by name"));
250 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred);
252 error = VFS_MOUNT(mp);
253 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error));
257 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
261 mtx_lock(&mountlist_mtx);
262 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
263 mtx_unlock(&mountlist_mtx);
271 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE);
273 printf("kern_symlink /dev -> / returns %d\n", error);
279 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs)
282 struct mount *mporoot, *mpnroot;
283 struct vnode *vp, *vporoot, *vpdevfs;
287 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list);
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);
297 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list);
298 mtx_unlock(&mountlist_mtx);
300 cache_purgevfs(mporoot);
301 if (mporoot != mpdevfs)
302 cache_purgevfs(mpdevfs);
304 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot);
307 vporoot->v_iflag &= ~VI_MOUNT;
309 vporoot->v_mountedhere = NULL;
310 mporoot->mnt_flag &= ~MNT_ROOTFS;
311 mporoot->mnt_vnodecovered = NULL;
314 /* Set up the new rootvnode, and purge the cache */
315 mpnroot->mnt_vnodecovered = NULL;
317 cache_purgevfs(rootvnode->v_mount);
319 if (mporoot != mpdevfs) {
320 /* Remount old root under /.mount or /mnt */
322 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
326 NDFREE(&nd, NDF_ONLY_PNBUF);
328 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
334 error = (vp->v_type == VDIR) ? 0 : ENOTDIR;
336 error = vinvalbuf(vp, V_SAVE, 0, 0);
339 mporoot->mnt_vnodecovered = vp;
340 vp->v_mountedhere = mporoot;
341 strlcpy(mporoot->mnt_stat.f_mntonname,
347 NDFREE(&nd, NDF_ONLY_PNBUF);
349 if (error && bootverbose)
350 printf("mountroot: unable to remount previous root "
351 "under /.mount or /mnt (error %d).\n", error);
354 /* Remount devfs under /dev */
355 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td);
359 error = (vp->v_type == VDIR) ? 0 : ENOTDIR;
361 error = vinvalbuf(vp, V_SAVE, 0, 0);
363 vpdevfs = mpdevfs->mnt_vnodecovered;
364 if (vpdevfs != NULL) {
365 cache_purge(vpdevfs);
366 vpdevfs->v_mountedhere = NULL;
369 mpdevfs->mnt_vnodecovered = vp;
370 vp->v_mountedhere = mpdevfs;
375 if (error && bootverbose)
376 printf("mountroot: unable to remount devfs under /dev "
377 "(error %d).\n", error);
378 NDFREE(&nd, NDF_ONLY_PNBUF);
380 if (mporoot == mpdevfs) {
382 /* Unlink the no longer needed /dev/dev -> / symlink */
383 error = kern_unlinkat(td, AT_FDCWD, "/dev/dev",
385 if (error && bootverbose)
386 printf("mountroot: unable to unlink /dev/dev "
387 "(error %d)\n", error);
392 * Configuration parser.
395 /* Parser character classes. */
396 #define CC_WHITESPACE -1
397 #define CC_NONWHITESPACE -2
404 parse_peek(char **conf)
411 parse_poke(char **conf, int c)
418 parse_advance(char **conf)
425 parse_skipto(char **conf, int mc)
430 c = parse_peek(conf);
435 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0;
437 case CC_NONWHITESPACE:
440 match = (c != ' ' && c != '\t') ? 1 : 0;
443 match = (c == mc) ? 1 : 0;
454 parse_token(char **conf, char **tok)
461 error = parse_skipto(conf, CC_NONWHITESPACE);
465 error = parse_skipto(conf, CC_WHITESPACE);
467 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO);
473 parse_dir_ask_printenv(const char *var)
477 val = kern_getenv(var);
479 printf(" %s=%s\n", var, val);
485 parse_dir_ask(char **conf)
491 printf("\nLoader variables:\n");
492 parse_dir_ask_printenv("vfs.root.mountfrom");
493 parse_dir_ask_printenv("vfs.root.mountfrom.options");
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");
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");
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");
512 printf("\nmountroot> ");
513 cngets(name, sizeof(name), GETS_ECHO);
516 if (name[0] == '?' && name[1] == '\0') {
517 printf("\nList of GEOM managed disk devices:\n ");
521 if (name[0] == '.' && name[1] == '\0') {
526 error = parse_mount(&mnt);
528 printf("Invalid file system specification.\n");
529 } while (error != 0);
535 parse_dir_md(char **conf)
539 struct md_ioctl *mdio;
545 error = parse_token(conf, &tok);
550 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO);
551 path = (void *)(mdio + 1);
552 bcopy(tok, path, len);
555 /* Get file status. */
556 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL);
560 /* Open /dev/mdctl so that we can attach/detach. */
561 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE,
566 fd = td->td_retval[0];
567 mdio->md_version = MDIOVERSION;
568 mdio->md_type = MD_VNODE;
570 if (root_mount_mddev != -1) {
571 mdio->md_unit = root_mount_mddev;
573 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);
575 /* Ignore errors. We don't care. */
576 root_mount_mddev = -1;
579 mdio->md_file = (void *)(mdio + 1);
580 mdio->md_options = MD_AUTOUNIT | MD_READONLY;
581 mdio->md_mediasize = sb.st_size;
584 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio);
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;
595 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);
597 /* Ignore errors. We don't care. */
602 root_mount_mddev = mdio->md_unit;
603 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file);
605 error = kern_close(td, fd);
613 parse_dir_onfail(char **conf)
618 error = parse_token(conf, &action);
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;
631 printf("rootmount: %s: unknown action\n", action);
635 free(action, M_TEMP);
640 parse_dir_timeout(char **conf)
646 error = parse_token(conf, &tok);
650 secs = strtol(tok, &endtok, 0);
651 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0;
653 root_mount_timeout = secs;
659 parse_directive(char **conf)
664 error = parse_token(conf, &dir);
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);
677 printf("mountroot: invalid directive `%s'\n", dir);
678 /* Ignore the rest of the line. */
679 (void)parse_skipto(conf, '\n');
687 parse_mount_dev_present(const char *dev)
692 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread);
696 NDFREE(&nd, NDF_ONLY_PNBUF);
697 return (error != 0) ? 0 : 1;
702 parse_mount(char **conf)
706 char *dev, *fs, *opts, *tok;
709 error = parse_token(conf, &tok);
713 error = parse_skipto(&tok, ':');
718 parse_poke(&tok, '\0');
722 if (root_mount_mddev != -1) {
723 /* Handle substitution for the md unit number. */
724 tok = strstr(dev, "md#");
726 tok[2] = '0' + root_mount_mddev;
730 error = parse_token(conf, &tok);
731 opts = (error == 0) ? tok : NULL;
733 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev,
734 (opts != NULL) ? opts : "");
736 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO);
738 if (vfs_byname(fs) == NULL) {
739 strlcpy(errmsg, "unknown file system", ERRMSGL);
744 error = vfs_mountroot_wait_if_neccessary(fs, dev);
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);
759 printf("Mounting from %s:%s failed with error %d",
761 if (errmsg[0] != '\0')
762 printf(": %s", errmsg);
766 free(errmsg, M_TEMP);
769 /* kernel_mount can return -1 on error. */
770 return ((error < 0) ? EDOOFUS : error);
775 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs)
781 root_mount_mddev = -1;
784 conf = sbuf_data(sb);
785 mp = TAILQ_NEXT(mpdevfs, mnt_list);
786 error = (mp == NULL) ? 0 : EDOOFUS;
787 root_mount_onfail = A_CONTINUE;
789 error = parse_skipto(&conf, CC_NONWHITESPACE);
790 if (error == PE_EOL) {
791 parse_advance(&conf);
796 switch (parse_peek(&conf)) {
798 error = parse_skipto(&conf, '\n');
801 error = parse_directive(&conf);
804 error = parse_mount(&conf);
806 printf("mountroot: invalid file system "
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');
819 mp = TAILQ_NEXT(mpdevfs, mnt_list);
825 * We failed to mount (a new) root.
827 switch (root_mount_onfail) {
831 panic("mountroot: unable to (re-)mount root.");
836 kern_reboot(RB_NOSYNC);
844 vfs_mountroot_conf0(struct sbuf *sb)
846 char *s, *tok, *mnt, *opt;
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");
854 if (boothowto & RB_DFLTROOT)
855 sbuf_printf(sb, "%s\n", ROOTDEVNAME);
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);
863 s = kern_getenv("vfs.root.mountfrom");
865 opt = kern_getenv("vfs.root.mountfrom.options");
867 error = parse_token(&tok, &mnt);
869 sbuf_printf(sb, "%s %s\n", mnt,
870 (opt != NULL) ? opt : "");
872 error = parse_token(&tok, &mnt);
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]);
883 if (!(boothowto & RB_DFLTROOT))
884 sbuf_printf(sb, "%s\n", ROOTDEVNAME);
886 if (!(boothowto & RB_ASKNAME))
887 sbuf_printf(sb, ".ask\n");
891 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb)
893 static char buf[128];
897 int error, flags, len;
899 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td);
901 error = vn_open(&nd, &flags, 0, NULL);
905 NDFREE(&nd, NDF_ONLY_PNBUF);
907 len = sizeof(buf) - 1;
909 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs,
910 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
916 buf[len - resid] = 0;
917 sbuf_printf(sb, "%s", buf);
921 VOP_UNLOCK(nd.ni_vp, 0);
922 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
927 vfs_mountroot_wait(void)
929 struct root_hold_token *h;
930 struct timeval lastfail;
938 mtx_lock(&root_holds_mtx);
939 if (LIST_EMPTY(&root_holds)) {
940 mtx_unlock(&root_holds_mtx);
943 if (ppsratecheck(&lastfail, &curfail, 1)) {
944 printf("Root mount waiting for:");
945 LIST_FOREACH(h, &root_holds, list)
946 printf(" %s", h->who);
949 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold",
955 vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev)
960 * In case of ZFS and NFS we don't have a way to wait for
963 if (strcmp(fs, "zfs") == 0 || strstr(fs, "nfs") != NULL ||
965 vfs_mountroot_wait();
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.
977 if (parse_mount_dev_present(dev))
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.
984 vfs_mountroot_wait();
985 printf("mountroot: waiting for device %s...\n", dev);
987 timeout = root_mount_timeout * hz;
989 pause("rmdev", delay);
991 } while (timeout > 0 && !parse_mount_dev_present(dev));
1010 sb = sbuf_new_auto();
1011 vfs_mountroot_conf0(sb);
1014 error = vfs_mountroot_devfs(td, &mp);
1016 error = vfs_mountroot_parse(sb, mp);
1018 vfs_mountroot_shuffle(td, mp);
1020 error = vfs_mountroot_readconf(td, sb);
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.
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);
1041 mtx_unlock(&mountlist_mtx);
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);
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);
1055 EVENTHANDLER_INVOKE(mountroot);
1058 static struct mntarg *
1059 parse_mountroot_options(struct mntarg *ma, const char *options)
1062 char *name, *name_arg;
1063 char *val, *val_arg;
1066 if (options == NULL || options[0] == '\0')
1069 p = opts = strdup(options, M_MOUNT);
1074 while((name = strsep(&p, ",")) != NULL) {
1075 if (name[0] == '\0')
1078 val = strchr(name, '=');
1083 if( strcmp(name, "rw") == 0 ||
1084 strcmp(name, "noro") == 0) {
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.
1092 name_arg = strdup(name, M_MOUNT);
1095 val_arg = strdup(val, M_MOUNT);
1097 ma = mount_arg(ma, name_arg, val_arg,
1098 (val_arg != NULL ? -1 : 0));
1100 free(opts, M_MOUNT);