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/systm.h>
68 #include <sys/vnode.h>
70 #include <geom/geom.h>
73 * The root filesystem is detailed in the kernel environment variable
74 * vfs.root.mountfrom, which is expected to be in the general format
76 * <vfsname>:[<path>][ <vfsname>:[<path>] ...]
77 * vfsname := the name of a VFS known to the kernel and capable
78 * of being mounted as root
79 * path := disk device name or other data used by the filesystem
80 * to locate its physical store
82 * If the environment variable vfs.root.mountfrom is a space separated list,
83 * each list element is tried in turn and the root filesystem will be mounted
84 * from the first one that succeeds.
86 * The environment variable vfs.root.mountfrom.options is a comma delimited
87 * set of string mount options. These mount options must be parseable
88 * by nmount() in the kernel.
91 static int parse_mount(char **);
92 static struct mntarg *parse_mountroot_options(struct mntarg *, const char *);
93 static int sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS);
94 static void vfs_mountroot_wait(void);
95 static int vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev);
98 * The vnode of the system's root (/ in the filesystem, without chroot
101 struct vnode *rootvnode;
104 * Mount of the system's /dev.
106 struct mount *rootdevmp;
108 char *rootdevnames[2] = {NULL, NULL};
110 struct mtx root_holds_mtx;
111 MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF);
113 static TAILQ_HEAD(, root_hold_token) root_holds =
114 TAILQ_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 TAILQ_FOREACH(h, &root_holds, list) {
159 if (h != TAILQ_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);
180 mtx_lock(&root_holds_mtx);
181 TSHOLD("root mount");
182 TAILQ_INSERT_TAIL(&root_holds, h, list);
183 mtx_unlock(&root_holds_mtx);
188 root_mount_hold_token(const char *identifier, struct root_hold_token *h)
191 struct root_hold_token *t;
196 mtx_lock(&root_holds_mtx);
198 TAILQ_FOREACH(t, &root_holds, list) {
200 panic("Duplicate mount hold by '%s' on %p",
205 TSHOLD("root mount");
206 TAILQ_INSERT_TAIL(&root_holds, h, list);
207 mtx_unlock(&root_holds_mtx);
211 root_mount_rel(struct root_hold_token *h)
214 if (h == NULL || h->flags == RH_FREE)
217 mtx_lock(&root_holds_mtx);
218 TAILQ_REMOVE(&root_holds, h, list);
219 TSRELEASE("root mount");
221 mtx_unlock(&root_holds_mtx);
222 if (h->flags == RH_ALLOC) {
232 /* No mutex is acquired here because int stores are atomic. */
233 return (root_mount_complete);
240 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode))
241 panic("set_rootvnode: Cannot find root vnode");
243 VOP_UNLOCK(rootvnode);
249 vfs_mountroot_devfs(struct thread *td, struct mount **mpp)
251 struct vfsoptlist *opts;
252 struct vfsconf *vfsp;
258 if (rootdevmp != NULL) {
260 * Already have /dev; this happens during rerooting.
262 error = vfs_busy(rootdevmp, 0);
267 vfsp = vfs_byname("devfs");
268 KASSERT(vfsp != NULL, ("Could not find devfs by name"));
272 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred);
274 error = VFS_MOUNT(mp);
275 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error));
279 error = VFS_STATFS(mp, &mp->mnt_stat);
280 KASSERT(error == 0, ("VFS_STATFS(devfs) failed %d", error));
284 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
288 mtx_lock(&mountlist_mtx);
289 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
290 mtx_unlock(&mountlist_mtx);
299 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE);
301 printf("kern_symlink /dev -> / returns %d\n", error);
307 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs)
310 struct mount *mporoot, *mpnroot;
311 struct vnode *vp, *vporoot, *vpdevfs;
315 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list);
317 /* Shuffle the mountlist. */
318 mtx_lock(&mountlist_mtx);
319 mporoot = TAILQ_FIRST(&mountlist);
320 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list);
321 if (mporoot != mpdevfs) {
322 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list);
323 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list);
325 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list);
326 mtx_unlock(&mountlist_mtx);
328 cache_purgevfs(mporoot);
329 if (mporoot != mpdevfs)
330 cache_purgevfs(mpdevfs);
332 if (VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot))
333 panic("vfs_mountroot_shuffle: Cannot find root vnode");
336 vporoot->v_iflag &= ~VI_MOUNT;
337 vn_irflag_unset_locked(vporoot, VIRF_MOUNTPOINT);
338 vporoot->v_mountedhere = NULL;
340 mporoot->mnt_flag &= ~MNT_ROOTFS;
341 mporoot->mnt_vnodecovered = NULL;
344 /* Set up the new rootvnode, and purge the cache */
345 mpnroot->mnt_vnodecovered = NULL;
347 cache_purgevfs(rootvnode->v_mount);
349 if (mporoot != mpdevfs) {
350 /* Remount old root under /.mount or /mnt */
352 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspath);
356 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
363 error = (vp->v_type == VDIR) ? 0 : ENOTDIR;
365 error = vinvalbuf(vp, V_SAVE, 0, 0);
369 mporoot->mnt_vnodecovered = vp;
370 vn_irflag_set_locked(vp, VIRF_MOUNTPOINT);
371 vp->v_mountedhere = mporoot;
372 strlcpy(mporoot->mnt_stat.f_mntonname,
381 printf("mountroot: unable to remount previous root "
382 "under /.mount or /mnt (error %d)\n", error);
385 /* Remount devfs under /dev */
386 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev");
391 error = (vp->v_type == VDIR) ? 0 : ENOTDIR;
393 error = vinvalbuf(vp, V_SAVE, 0, 0);
395 vpdevfs = mpdevfs->mnt_vnodecovered;
396 if (vpdevfs != NULL) {
397 cache_purge(vpdevfs);
399 vn_irflag_unset_locked(vpdevfs, VIRF_MOUNTPOINT);
400 vpdevfs->v_mountedhere = NULL;
405 mpdevfs->mnt_vnodecovered = vp;
406 vn_irflag_set_locked(vp, VIRF_MOUNTPOINT);
407 vp->v_mountedhere = mpdevfs;
414 printf("mountroot: unable to remount devfs under /dev "
415 "(error %d)\n", error);
417 if (mporoot == mpdevfs) {
419 /* Unlink the no longer needed /dev/dev -> / symlink */
420 error = kern_funlinkat(td, AT_FDCWD, "/dev/dev", FD_NONE,
423 printf("mountroot: unable to unlink /dev/dev "
424 "(error %d)\n", error);
429 * Configuration parser.
432 /* Parser character classes. */
433 #define CC_WHITESPACE -1
434 #define CC_NONWHITESPACE -2
441 parse_peek(char **conf)
448 parse_poke(char **conf, int c)
455 parse_advance(char **conf)
462 parse_skipto(char **conf, int mc)
467 c = parse_peek(conf);
472 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0;
474 case CC_NONWHITESPACE:
477 match = (c != ' ' && c != '\t') ? 1 : 0;
480 match = (c == mc) ? 1 : 0;
491 parse_token(char **conf, char **tok)
498 error = parse_skipto(conf, CC_NONWHITESPACE);
502 error = parse_skipto(conf, CC_WHITESPACE);
504 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO);
510 parse_dir_ask_printenv(const char *var)
514 val = kern_getenv(var);
516 printf(" %s=%s\n", var, val);
522 parse_dir_ask(char **conf)
528 vfs_mountroot_wait();
530 printf("\nLoader variables:\n");
531 parse_dir_ask_printenv("vfs.root.mountfrom");
532 parse_dir_ask_printenv("vfs.root.mountfrom.options");
534 printf("\nManual root filesystem specification:\n");
535 printf(" <fstype>:<device> [options]\n");
536 printf(" Mount <device> using filesystem <fstype>\n");
537 printf(" and with the specified (optional) option list.\n");
539 printf(" eg. ufs:/dev/da0s1a\n");
540 printf(" zfs:zroot/ROOT/default\n");
541 printf(" cd9660:/dev/cd0 ro\n");
542 printf(" (which is equivalent to: ");
543 printf("mount -t cd9660 -o ro /dev/cd0 /)\n");
545 printf(" ? List valid disk boot devices\n");
546 printf(" . Yield 1 second (for background tasks)\n");
547 printf(" <empty line> Abort manual input\n");
551 printf("\nmountroot> ");
552 cngets(name, sizeof(name), GETS_ECHO);
555 if (name[0] == '?' && name[1] == '\0') {
556 printf("\nList of GEOM managed disk devices:\n ");
560 if (name[0] == '.' && name[1] == '\0') {
565 error = parse_mount(&mnt);
567 printf("Invalid file system specification.\n");
568 } while (error != 0);
574 parse_dir_md(char **conf)
578 struct md_ioctl *mdio;
585 error = parse_token(conf, &tok);
590 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO);
591 path = (void *)(mdio + 1);
592 bcopy(tok, path, len);
595 /* Get file status. */
596 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb);
600 /* Open /dev/mdctl so that we can attach/detach. */
601 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE,
606 fd = td->td_retval[0];
607 mdio->md_version = MDIOVERSION;
608 mdio->md_type = MD_VNODE;
610 if (root_mount_mddev != -1) {
611 mdio->md_unit = root_mount_mddev;
612 (void)kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);
613 /* Ignore errors. We don't care. */
614 root_mount_mddev = -1;
617 mdio->md_file = (void *)(mdio + 1);
618 mdio->md_options = MD_AUTOUNIT | MD_READONLY;
619 mdio->md_mediasize = sb.st_size;
621 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio);
625 if (mdio->md_unit > 9) {
626 printf("rootmount: too many md units\n");
627 mdio->md_file = NULL;
628 mdio->md_options = 0;
629 mdio->md_mediasize = 0;
630 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);
631 /* Ignore errors. We don't care. */
636 root_mount_mddev = mdio->md_unit;
637 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file);
641 (void)kern_close(td, fd);
647 parse_dir_onfail(char **conf)
652 error = parse_token(conf, &action);
656 if (!strcmp(action, "continue"))
657 root_mount_onfail = A_CONTINUE;
658 else if (!strcmp(action, "panic"))
659 root_mount_onfail = A_PANIC;
660 else if (!strcmp(action, "reboot"))
661 root_mount_onfail = A_REBOOT;
662 else if (!strcmp(action, "retry"))
663 root_mount_onfail = A_RETRY;
665 printf("rootmount: %s: unknown action\n", action);
669 free(action, M_TEMP);
674 parse_dir_timeout(char **conf)
680 error = parse_token(conf, &tok);
684 secs = strtol(tok, &endtok, 0);
685 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0;
687 root_mount_timeout = secs;
693 parse_directive(char **conf)
698 error = parse_token(conf, &dir);
702 if (strcmp(dir, ".ask") == 0)
703 error = parse_dir_ask(conf);
704 else if (strcmp(dir, ".md") == 0)
705 error = parse_dir_md(conf);
706 else if (strcmp(dir, ".onfail") == 0)
707 error = parse_dir_onfail(conf);
708 else if (strcmp(dir, ".timeout") == 0)
709 error = parse_dir_timeout(conf);
711 printf("mountroot: invalid directive `%s'\n", dir);
712 /* Ignore the rest of the line. */
713 (void)parse_skipto(conf, '\n');
721 parse_mount_dev_present(const char *dev)
726 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, dev);
737 parse_mount(char **conf)
741 char *dev, *fs, *opts, *tok;
742 int delay, error, timeout;
744 error = parse_token(conf, &tok);
748 error = parse_skipto(&tok, ':');
753 parse_poke(&tok, '\0');
757 if (root_mount_mddev != -1) {
758 /* Handle substitution for the md unit number. */
759 tok = strstr(dev, "md#");
761 tok[2] = '0' + root_mount_mddev;
765 error = parse_token(conf, &tok);
766 opts = (error == 0) ? tok : NULL;
768 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev,
769 (opts != NULL) ? opts : "");
771 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO);
773 if (vfs_byname(fs) == NULL) {
774 strlcpy(errmsg, "unknown file system", ERRMSGL);
779 error = vfs_mountroot_wait_if_neccessary(fs, dev);
784 timeout = root_mount_timeout * hz;
788 ma = mount_arg(ma, "fstype", fs, -1);
789 ma = mount_arg(ma, "fspath", "/", -1);
790 ma = mount_arg(ma, "from", dev, -1);
791 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL);
792 ma = mount_arg(ma, "ro", NULL, 0);
793 ma = parse_mountroot_options(ma, opts);
795 error = kernel_mount(ma, MNT_ROOTFS);
796 if (error == 0 || error == EILSEQ || timeout <= 0)
799 if (root_mount_timeout * hz == timeout ||
800 (bootverbose && timeout % hz == 0)) {
801 printf("Mounting from %s:%s failed with error %d; "
802 "retrying for %d more second%s\n", fs, dev, error,
803 timeout / hz, (timeout / hz > 1) ? "s" : "");
805 pause("rmretry", delay);
810 printf("Mounting from %s:%s failed with error %d",
812 if (errmsg[0] != '\0')
813 printf(": %s", errmsg);
817 free(errmsg, M_TEMP);
820 /* kernel_mount can return -1 on error. */
821 return ((error < 0) ? EDOOFUS : error);
826 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs)
832 root_mount_mddev = -1;
835 conf = sbuf_data(sb);
836 mp = TAILQ_NEXT(mpdevfs, mnt_list);
837 error = (mp == NULL) ? 0 : EDOOFUS;
838 root_mount_onfail = A_CONTINUE;
840 error = parse_skipto(&conf, CC_NONWHITESPACE);
841 if (error == PE_EOL) {
842 parse_advance(&conf);
847 switch (parse_peek(&conf)) {
849 error = parse_skipto(&conf, '\n');
852 error = parse_directive(&conf);
855 error = parse_mount(&conf);
857 printf("mountroot: invalid file system "
865 /* Ignore any trailing garbage on the line. */
866 if (parse_peek(&conf) != '\n') {
867 printf("mountroot: advancing to next directive...\n");
868 (void)parse_skipto(&conf, '\n');
870 mp = TAILQ_NEXT(mpdevfs, mnt_list);
876 * We failed to mount (a new) root.
878 switch (root_mount_onfail) {
882 panic("mountroot: unable to (re-)mount root.");
887 kern_reboot(RB_NOSYNC);
895 vfs_mountroot_conf0(struct sbuf *sb)
897 char *s, *tok, *mnt, *opt;
900 sbuf_printf(sb, ".onfail panic\n");
901 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout);
902 if (boothowto & RB_ASKNAME)
903 sbuf_printf(sb, ".ask\n");
905 if (boothowto & RB_DFLTROOT)
906 sbuf_printf(sb, "%s\n", ROOTDEVNAME);
908 if (boothowto & RB_CDROM) {
909 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n");
910 sbuf_printf(sb, ".timeout 0\n");
911 sbuf_printf(sb, "cd9660:/dev/cd1 ro\n");
912 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout);
914 s = kern_getenv("vfs.root.mountfrom");
916 opt = kern_getenv("vfs.root.mountfrom.options");
918 error = parse_token(&tok, &mnt);
920 sbuf_printf(sb, "%s %s\n", mnt,
921 (opt != NULL) ? opt : "");
923 error = parse_token(&tok, &mnt);
929 if (rootdevnames[0] != NULL)
930 sbuf_printf(sb, "%s\n", rootdevnames[0]);
931 if (rootdevnames[1] != NULL)
932 sbuf_printf(sb, "%s\n", rootdevnames[1]);
934 if (!(boothowto & RB_DFLTROOT))
935 sbuf_printf(sb, "%s\n", ROOTDEVNAME);
937 if (!(boothowto & RB_ASKNAME))
938 sbuf_printf(sb, ".ask\n");
942 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb)
944 static char buf[128];
948 int error, flags, len;
950 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf");
952 error = vn_open(&nd, &flags, 0, NULL);
958 len = sizeof(buf) - 1;
960 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs,
961 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
967 buf[len - resid] = 0;
968 sbuf_printf(sb, "%s", buf);
972 VOP_UNLOCK(nd.ni_vp);
973 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
978 vfs_mountroot_wait(void)
980 struct root_hold_token *h;
982 struct timeval lastfail;
989 eventratecheck(&lastfail, &curfail, 1);
993 mtx_lock(&root_holds_mtx);
994 if (TAILQ_EMPTY(&root_holds)) {
995 mtx_unlock(&root_holds_mtx);
998 if (eventratecheck(&lastfail, &curfail, 1)) {
999 printf("Root mount waiting for:");
1000 TAILQ_FOREACH(h, &root_holds, list)
1001 printf(" %s", h->who);
1004 TSWAIT("root mount");
1005 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold",
1007 TSUNWAIT("root mount");
1015 vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev)
1020 * In case of ZFS and NFS we don't have a way to wait for
1021 * specific device. Also do the wait if the user forced that
1022 * behaviour by setting vfs.root_mount_always_wait=1.
1024 if (strcmp(fs, "zfs") == 0 || strstr(fs, "nfs") != NULL ||
1025 dev[0] == '\0' || root_mount_always_wait != 0) {
1026 vfs_mountroot_wait();
1031 * Otherwise, no point in waiting if the device is already there.
1032 * Note that we must wait for GEOM to finish reconfiguring itself,
1033 * eg for geom_part(4) to finish tasting.
1035 g_waitidle(curthread);
1036 if (parse_mount_dev_present(dev))
1040 * No luck. Let's wait. This code looks weird, but it's that way
1041 * to behave exactly as it used to work before.
1043 vfs_mountroot_wait();
1044 if (parse_mount_dev_present(dev))
1046 printf("mountroot: waiting for device %s...\n", dev);
1048 timeout = root_mount_timeout * hz;
1050 pause("rmdev", delay);
1052 } while (timeout > 0 && !parse_mount_dev_present(dev));
1069 mtx_assert(&Giant, MA_NOTOWNED);
1075 sb = sbuf_new_auto();
1076 vfs_mountroot_conf0(sb);
1079 error = vfs_mountroot_devfs(td, &mp);
1081 error = vfs_mountroot_parse(sb, mp);
1083 vfs_mountroot_shuffle(td, mp);
1085 error = vfs_mountroot_readconf(td, sb);
1093 * Iterate over all currently mounted file systems and use
1094 * the time stamp found to check and/or initialize the RTC.
1095 * Call inittodr() only once and pass it the largest of the
1096 * timestamps we encounter.
1099 mtx_lock(&mountlist_mtx);
1100 mp = TAILQ_FIRST(&mountlist);
1101 while (mp != NULL) {
1102 if (mp->mnt_time > timebase)
1103 timebase = mp->mnt_time;
1104 mp = TAILQ_NEXT(mp, mnt_list);
1106 mtx_unlock(&mountlist_mtx);
1109 /* Keep prison0's root in sync with the global rootvnode. */
1110 mtx_lock(&prison0.pr_mtx);
1111 prison0.pr_root = rootvnode;
1112 vref(prison0.pr_root);
1113 mtx_unlock(&prison0.pr_mtx);
1115 mtx_lock(&root_holds_mtx);
1116 atomic_store_rel_int(&root_mount_complete, 1);
1117 wakeup(&root_mount_complete);
1118 mtx_unlock(&root_holds_mtx);
1120 EVENTHANDLER_INVOKE(mountroot);
1125 static struct mntarg *
1126 parse_mountroot_options(struct mntarg *ma, const char *options)
1129 char *name, *name_arg;
1130 char *val, *val_arg;
1133 if (options == NULL || options[0] == '\0')
1136 p = opts = strdup(options, M_MOUNT);
1141 while((name = strsep(&p, ",")) != NULL) {
1142 if (name[0] == '\0')
1145 val = strchr(name, '=');
1150 if (strcmp(name, "rw") == 0 || strcmp(name, "noro") == 0) {
1152 * The first time we mount the root file system,
1153 * we need to mount 'ro', so We need to ignore
1154 * 'rw' and 'noro' mount options.
1158 name_arg = strdup(name, M_MOUNT);
1161 val_arg = strdup(val, M_MOUNT);
1163 ma = mount_arg(ma, name_arg, val_arg,
1164 (val_arg != NULL ? -1 : 0));
1166 free(opts, M_MOUNT);