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eb6d6216c4
It has nothing to share with mutex protecting list of mounted file systems.
1038 lines
23 KiB
C
1038 lines
23 KiB
C
/*-
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* Copyright (c) 2010 Marcel Moolenaar
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* Copyright (c) 1999-2004 Poul-Henning Kamp
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* Copyright (c) 1999 Michael Smith
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "opt_rootdevname.h"
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/fcntl.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mdioctl.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/filedesc.h>
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#include <sys/reboot.h>
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#include <sys/sbuf.h>
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#include <sys/stat.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysproto.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <geom/geom.h>
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/*
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* The root filesystem is detailed in the kernel environment variable
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* vfs.root.mountfrom, which is expected to be in the general format
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*
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* <vfsname>:[<path>][ <vfsname>:[<path>] ...]
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* vfsname := the name of a VFS known to the kernel and capable
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* of being mounted as root
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* path := disk device name or other data used by the filesystem
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* to locate its physical store
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*
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* If the environment variable vfs.root.mountfrom is a space separated list,
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* each list element is tried in turn and the root filesystem will be mounted
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* from the first one that suceeds.
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*
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* The environment variable vfs.root.mountfrom.options is a comma delimited
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* set of string mount options. These mount options must be parseable
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* by nmount() in the kernel.
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*/
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static int parse_mount(char **);
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static struct mntarg *parse_mountroot_options(struct mntarg *, const char *);
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/*
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* The vnode of the system's root (/ in the filesystem, without chroot
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* active.)
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*/
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struct vnode *rootvnode;
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char *rootdevnames[2] = {NULL, NULL};
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struct mtx root_holds_mtx;
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MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF);
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struct root_hold_token {
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const char *who;
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LIST_ENTRY(root_hold_token) list;
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};
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static LIST_HEAD(, root_hold_token) root_holds =
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LIST_HEAD_INITIALIZER(root_holds);
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enum action {
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A_CONTINUE,
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A_PANIC,
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A_REBOOT,
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A_RETRY
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};
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static enum action root_mount_onfail = A_CONTINUE;
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static int root_mount_mddev;
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static int root_mount_complete;
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/* By default wait up to 3 seconds for devices to appear. */
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static int root_mount_timeout = 3;
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TUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout);
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struct root_hold_token *
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root_mount_hold(const char *identifier)
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{
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struct root_hold_token *h;
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if (root_mounted())
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return (NULL);
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h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK);
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h->who = identifier;
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mtx_lock(&root_holds_mtx);
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LIST_INSERT_HEAD(&root_holds, h, list);
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mtx_unlock(&root_holds_mtx);
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return (h);
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}
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void
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root_mount_rel(struct root_hold_token *h)
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{
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if (h == NULL)
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return;
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mtx_lock(&root_holds_mtx);
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LIST_REMOVE(h, list);
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wakeup(&root_holds);
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mtx_unlock(&root_holds_mtx);
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free(h, M_DEVBUF);
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}
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int
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root_mounted(void)
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{
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/* No mutex is acquired here because int stores are atomic. */
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return (root_mount_complete);
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}
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void
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root_mount_wait(void)
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{
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/*
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* Panic on an obvious deadlock - the function can't be called from
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* a thread which is doing the whole SYSINIT stuff.
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*/
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KASSERT(curthread->td_proc->p_pid != 0,
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("root_mount_wait: cannot be called from the swapper thread"));
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mtx_lock(&root_holds_mtx);
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while (!root_mount_complete) {
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msleep(&root_mount_complete, &root_holds_mtx, PZERO, "rootwait",
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hz);
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}
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mtx_unlock(&root_holds_mtx);
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}
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static void
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set_rootvnode(void)
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{
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struct proc *p;
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if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode))
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panic("Cannot find root vnode");
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VOP_UNLOCK(rootvnode, 0);
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p = curthread->td_proc;
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FILEDESC_XLOCK(p->p_fd);
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if (p->p_fd->fd_cdir != NULL)
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vrele(p->p_fd->fd_cdir);
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p->p_fd->fd_cdir = rootvnode;
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VREF(rootvnode);
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if (p->p_fd->fd_rdir != NULL)
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vrele(p->p_fd->fd_rdir);
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p->p_fd->fd_rdir = rootvnode;
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VREF(rootvnode);
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FILEDESC_XUNLOCK(p->p_fd);
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}
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static int
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vfs_mountroot_devfs(struct thread *td, struct mount **mpp)
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{
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struct vfsoptlist *opts;
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struct vfsconf *vfsp;
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struct mount *mp;
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int error;
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*mpp = NULL;
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vfsp = vfs_byname("devfs");
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KASSERT(vfsp != NULL, ("Could not find devfs by name"));
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if (vfsp == NULL)
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return (ENOENT);
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mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred);
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error = VFS_MOUNT(mp);
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KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error));
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if (error)
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return (error);
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opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
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TAILQ_INIT(opts);
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mp->mnt_opt = opts;
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mtx_lock(&mountlist_mtx);
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TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
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mtx_unlock(&mountlist_mtx);
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*mpp = mp;
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set_rootvnode();
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error = kern_symlink(td, "/", "dev", UIO_SYSSPACE);
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if (error)
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printf("kern_symlink /dev -> / returns %d\n", error);
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return (error);
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}
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static int
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vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs)
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{
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struct nameidata nd;
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struct mount *mporoot, *mpnroot;
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struct vnode *vp, *vporoot, *vpdevfs;
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char *fspath;
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int error;
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mpnroot = TAILQ_NEXT(mpdevfs, mnt_list);
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/* Shuffle the mountlist. */
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mtx_lock(&mountlist_mtx);
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mporoot = TAILQ_FIRST(&mountlist);
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TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list);
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if (mporoot != mpdevfs) {
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TAILQ_REMOVE(&mountlist, mpnroot, mnt_list);
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TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list);
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}
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TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list);
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mtx_unlock(&mountlist_mtx);
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cache_purgevfs(mporoot);
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if (mporoot != mpdevfs)
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cache_purgevfs(mpdevfs);
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VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot);
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VI_LOCK(vporoot);
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vporoot->v_iflag &= ~VI_MOUNT;
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VI_UNLOCK(vporoot);
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vporoot->v_mountedhere = NULL;
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mporoot->mnt_flag &= ~MNT_ROOTFS;
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mporoot->mnt_vnodecovered = NULL;
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vput(vporoot);
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/* Set up the new rootvnode, and purge the cache */
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mpnroot->mnt_vnodecovered = NULL;
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set_rootvnode();
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cache_purgevfs(rootvnode->v_mount);
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if (mporoot != mpdevfs) {
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/* Remount old root under /.mount or /mnt */
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fspath = "/.mount";
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
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fspath, td);
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error = namei(&nd);
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if (error) {
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NDFREE(&nd, NDF_ONLY_PNBUF);
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fspath = "/mnt";
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
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fspath, td);
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error = namei(&nd);
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}
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if (!error) {
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vp = nd.ni_vp;
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error = (vp->v_type == VDIR) ? 0 : ENOTDIR;
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if (!error)
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error = vinvalbuf(vp, V_SAVE, 0, 0);
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if (!error) {
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cache_purge(vp);
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mporoot->mnt_vnodecovered = vp;
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vp->v_mountedhere = mporoot;
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strlcpy(mporoot->mnt_stat.f_mntonname,
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fspath, MNAMELEN);
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VOP_UNLOCK(vp, 0);
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} else
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vput(vp);
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}
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NDFREE(&nd, NDF_ONLY_PNBUF);
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if (error && bootverbose)
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printf("mountroot: unable to remount previous root "
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"under /.mount or /mnt (error %d).\n", error);
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}
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/* Remount devfs under /dev */
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td);
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error = namei(&nd);
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if (!error) {
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vp = nd.ni_vp;
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error = (vp->v_type == VDIR) ? 0 : ENOTDIR;
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if (!error)
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error = vinvalbuf(vp, V_SAVE, 0, 0);
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if (!error) {
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vpdevfs = mpdevfs->mnt_vnodecovered;
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if (vpdevfs != NULL) {
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cache_purge(vpdevfs);
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vpdevfs->v_mountedhere = NULL;
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vrele(vpdevfs);
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}
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mpdevfs->mnt_vnodecovered = vp;
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vp->v_mountedhere = mpdevfs;
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VOP_UNLOCK(vp, 0);
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} else
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vput(vp);
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}
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if (error && bootverbose)
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printf("mountroot: unable to remount devfs under /dev "
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"(error %d).\n", error);
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NDFREE(&nd, NDF_ONLY_PNBUF);
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if (mporoot == mpdevfs) {
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vfs_unbusy(mpdevfs);
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/* Unlink the no longer needed /dev/dev -> / symlink */
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error = kern_unlink(td, "/dev/dev", UIO_SYSSPACE);
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if (error && bootverbose)
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printf("mountroot: unable to unlink /dev/dev "
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"(error %d)\n", error);
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}
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return (0);
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}
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/*
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* Configuration parser.
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*/
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/* Parser character classes. */
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#define CC_WHITESPACE -1
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#define CC_NONWHITESPACE -2
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/* Parse errors. */
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#define PE_EOF -1
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#define PE_EOL -2
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static __inline int
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parse_peek(char **conf)
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{
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return (**conf);
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}
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static __inline void
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parse_poke(char **conf, int c)
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{
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**conf = c;
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}
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static __inline void
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parse_advance(char **conf)
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{
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(*conf)++;
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}
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static int
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parse_skipto(char **conf, int mc)
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{
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int c, match;
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while (1) {
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c = parse_peek(conf);
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if (c == 0)
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return (PE_EOF);
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switch (mc) {
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case CC_WHITESPACE:
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match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0;
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break;
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case CC_NONWHITESPACE:
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if (c == '\n')
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return (PE_EOL);
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match = (c != ' ' && c != '\t') ? 1 : 0;
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break;
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default:
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match = (c == mc) ? 1 : 0;
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break;
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}
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if (match)
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break;
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parse_advance(conf);
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}
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return (0);
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}
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static int
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parse_token(char **conf, char **tok)
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{
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char *p;
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size_t len;
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int error;
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*tok = NULL;
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error = parse_skipto(conf, CC_NONWHITESPACE);
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if (error)
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return (error);
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p = *conf;
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error = parse_skipto(conf, CC_WHITESPACE);
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len = *conf - p;
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*tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO);
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bcopy(p, *tok, len);
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return (0);
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}
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static void
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parse_dir_ask_printenv(const char *var)
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{
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char *val;
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val = getenv(var);
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if (val != NULL) {
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printf(" %s=%s\n", var, val);
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freeenv(val);
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}
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}
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static int
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parse_dir_ask(char **conf)
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{
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char name[80];
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char *mnt;
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int error;
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printf("\nLoader variables:\n");
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parse_dir_ask_printenv("vfs.root.mountfrom");
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parse_dir_ask_printenv("vfs.root.mountfrom.options");
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printf("\nManual root filesystem specification:\n");
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printf(" <fstype>:<device> [options]\n");
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printf(" Mount <device> using filesystem <fstype>\n");
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printf(" and with the specified (optional) option list.\n");
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printf("\n");
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printf(" eg. ufs:/dev/da0s1a\n");
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printf(" zfs:tank\n");
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printf(" cd9660:/dev/acd0 ro\n");
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printf(" (which is equivalent to: ");
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printf("mount -t cd9660 -o ro /dev/acd0 /)\n");
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printf("\n");
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printf(" ? List valid disk boot devices\n");
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printf(" . Yield 1 second (for background tasks)\n");
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printf(" <empty line> Abort manual input\n");
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do {
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error = EINVAL;
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printf("\nmountroot> ");
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cngets(name, sizeof(name), GETS_ECHO);
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if (name[0] == '\0')
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break;
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if (name[0] == '?' && name[1] == '\0') {
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printf("\nList of GEOM managed disk devices:\n ");
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g_dev_print();
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continue;
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}
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if (name[0] == '.' && name[1] == '\0') {
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pause("rmask", hz);
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continue;
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}
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mnt = name;
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error = parse_mount(&mnt);
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if (error == -1)
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printf("Invalid file system specification.\n");
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} while (error != 0);
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return (error);
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}
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static int
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parse_dir_md(char **conf)
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{
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struct stat sb;
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struct thread *td;
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struct md_ioctl *mdio;
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char *path, *tok;
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int error, fd, len;
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td = curthread;
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error = parse_token(conf, &tok);
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if (error)
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return (error);
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len = strlen(tok);
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mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO);
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path = (void *)(mdio + 1);
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bcopy(tok, path, len);
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free(tok, M_TEMP);
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|
|
/* Get file status. */
|
|
error = kern_stat(td, path, UIO_SYSSPACE, &sb);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* Open /dev/mdctl so that we can attach/detach. */
|
|
error = kern_open(td, "/dev/" MDCTL_NAME, UIO_SYSSPACE, O_RDWR, 0);
|
|
if (error)
|
|
goto out;
|
|
|
|
fd = td->td_retval[0];
|
|
mdio->md_version = MDIOVERSION;
|
|
mdio->md_type = MD_VNODE;
|
|
|
|
if (root_mount_mddev != -1) {
|
|
mdio->md_unit = root_mount_mddev;
|
|
DROP_GIANT();
|
|
error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);
|
|
PICKUP_GIANT();
|
|
/* Ignore errors. We don't care. */
|
|
root_mount_mddev = -1;
|
|
}
|
|
|
|
mdio->md_file = (void *)(mdio + 1);
|
|
mdio->md_options = MD_AUTOUNIT | MD_READONLY;
|
|
mdio->md_mediasize = sb.st_size;
|
|
mdio->md_unit = 0;
|
|
DROP_GIANT();
|
|
error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio);
|
|
PICKUP_GIANT();
|
|
if (error)
|
|
goto out;
|
|
|
|
if (mdio->md_unit > 9) {
|
|
printf("rootmount: too many md units\n");
|
|
mdio->md_file = NULL;
|
|
mdio->md_options = 0;
|
|
mdio->md_mediasize = 0;
|
|
DROP_GIANT();
|
|
error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);
|
|
PICKUP_GIANT();
|
|
/* Ignore errors. We don't care. */
|
|
error = ERANGE;
|
|
goto out;
|
|
}
|
|
|
|
root_mount_mddev = mdio->md_unit;
|
|
printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file);
|
|
|
|
error = kern_close(td, fd);
|
|
|
|
out:
|
|
free(mdio, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
parse_dir_onfail(char **conf)
|
|
{
|
|
char *action;
|
|
int error;
|
|
|
|
error = parse_token(conf, &action);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (!strcmp(action, "continue"))
|
|
root_mount_onfail = A_CONTINUE;
|
|
else if (!strcmp(action, "panic"))
|
|
root_mount_onfail = A_PANIC;
|
|
else if (!strcmp(action, "reboot"))
|
|
root_mount_onfail = A_REBOOT;
|
|
else if (!strcmp(action, "retry"))
|
|
root_mount_onfail = A_RETRY;
|
|
else {
|
|
printf("rootmount: %s: unknown action\n", action);
|
|
error = EINVAL;
|
|
}
|
|
|
|
free(action, M_TEMP);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
parse_dir_timeout(char **conf)
|
|
{
|
|
char *tok, *endtok;
|
|
long secs;
|
|
int error;
|
|
|
|
error = parse_token(conf, &tok);
|
|
if (error)
|
|
return (error);
|
|
|
|
secs = strtol(tok, &endtok, 0);
|
|
error = (secs < 0 || *endtok != '\0') ? EINVAL : 0;
|
|
if (!error)
|
|
root_mount_timeout = secs;
|
|
free(tok, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
parse_directive(char **conf)
|
|
{
|
|
char *dir;
|
|
int error;
|
|
|
|
error = parse_token(conf, &dir);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (strcmp(dir, ".ask") == 0)
|
|
error = parse_dir_ask(conf);
|
|
else if (strcmp(dir, ".md") == 0)
|
|
error = parse_dir_md(conf);
|
|
else if (strcmp(dir, ".onfail") == 0)
|
|
error = parse_dir_onfail(conf);
|
|
else if (strcmp(dir, ".timeout") == 0)
|
|
error = parse_dir_timeout(conf);
|
|
else {
|
|
printf("mountroot: invalid directive `%s'\n", dir);
|
|
/* Ignore the rest of the line. */
|
|
(void)parse_skipto(conf, '\n');
|
|
error = EINVAL;
|
|
}
|
|
free(dir, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
parse_mount_dev_present(const char *dev)
|
|
{
|
|
struct nameidata nd;
|
|
int error;
|
|
|
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread);
|
|
error = namei(&nd);
|
|
if (!error)
|
|
vput(nd.ni_vp);
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
return (error != 0) ? 0 : 1;
|
|
}
|
|
|
|
#define ERRMSGL 255
|
|
static int
|
|
parse_mount(char **conf)
|
|
{
|
|
char *errmsg;
|
|
struct mntarg *ma;
|
|
char *dev, *fs, *opts, *tok;
|
|
int delay, error, timeout;
|
|
|
|
error = parse_token(conf, &tok);
|
|
if (error)
|
|
return (error);
|
|
fs = tok;
|
|
error = parse_skipto(&tok, ':');
|
|
if (error) {
|
|
free(fs, M_TEMP);
|
|
return (error);
|
|
}
|
|
parse_poke(&tok, '\0');
|
|
parse_advance(&tok);
|
|
dev = tok;
|
|
|
|
if (root_mount_mddev != -1) {
|
|
/* Handle substitution for the md unit number. */
|
|
tok = strstr(dev, "md#");
|
|
if (tok != NULL)
|
|
tok[2] = '0' + root_mount_mddev;
|
|
}
|
|
|
|
/* Parse options. */
|
|
error = parse_token(conf, &tok);
|
|
opts = (error == 0) ? tok : NULL;
|
|
|
|
printf("Trying to mount root from %s:%s [%s]...\n", fs, dev,
|
|
(opts != NULL) ? opts : "");
|
|
|
|
errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO);
|
|
|
|
if (vfs_byname(fs) == NULL) {
|
|
strlcpy(errmsg, "unknown file system", ERRMSGL);
|
|
error = ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
if (strcmp(fs, "zfs") != 0 && strstr(fs, "nfs") == NULL &&
|
|
dev[0] != '\0' && !parse_mount_dev_present(dev)) {
|
|
printf("mountroot: waiting for device %s ...\n", dev);
|
|
delay = hz / 10;
|
|
timeout = root_mount_timeout * hz;
|
|
do {
|
|
pause("rmdev", delay);
|
|
timeout -= delay;
|
|
} while (timeout > 0 && !parse_mount_dev_present(dev));
|
|
if (timeout <= 0) {
|
|
error = ENODEV;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ma = NULL;
|
|
ma = mount_arg(ma, "fstype", fs, -1);
|
|
ma = mount_arg(ma, "fspath", "/", -1);
|
|
ma = mount_arg(ma, "from", dev, -1);
|
|
ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL);
|
|
ma = mount_arg(ma, "ro", NULL, 0);
|
|
ma = parse_mountroot_options(ma, opts);
|
|
error = kernel_mount(ma, MNT_ROOTFS);
|
|
|
|
out:
|
|
if (error) {
|
|
printf("Mounting from %s:%s failed with error %d",
|
|
fs, dev, error);
|
|
if (errmsg[0] != '\0')
|
|
printf(": %s", errmsg);
|
|
printf(".\n");
|
|
}
|
|
free(fs, M_TEMP);
|
|
free(errmsg, M_TEMP);
|
|
if (opts != NULL)
|
|
free(opts, M_TEMP);
|
|
/* kernel_mount can return -1 on error. */
|
|
return ((error < 0) ? EDOOFUS : error);
|
|
}
|
|
#undef ERRMSGL
|
|
|
|
static int
|
|
vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs)
|
|
{
|
|
struct mount *mp;
|
|
char *conf;
|
|
int error;
|
|
|
|
root_mount_mddev = -1;
|
|
|
|
retry:
|
|
conf = sbuf_data(sb);
|
|
mp = TAILQ_NEXT(mpdevfs, mnt_list);
|
|
error = (mp == NULL) ? 0 : EDOOFUS;
|
|
root_mount_onfail = A_CONTINUE;
|
|
while (mp == NULL) {
|
|
error = parse_skipto(&conf, CC_NONWHITESPACE);
|
|
if (error == PE_EOL) {
|
|
parse_advance(&conf);
|
|
continue;
|
|
}
|
|
if (error < 0)
|
|
break;
|
|
switch (parse_peek(&conf)) {
|
|
case '#':
|
|
error = parse_skipto(&conf, '\n');
|
|
break;
|
|
case '.':
|
|
error = parse_directive(&conf);
|
|
break;
|
|
default:
|
|
error = parse_mount(&conf);
|
|
break;
|
|
}
|
|
if (error < 0)
|
|
break;
|
|
/* Ignore any trailing garbage on the line. */
|
|
if (parse_peek(&conf) != '\n') {
|
|
printf("mountroot: advancing to next directive...\n");
|
|
(void)parse_skipto(&conf, '\n');
|
|
}
|
|
mp = TAILQ_NEXT(mpdevfs, mnt_list);
|
|
}
|
|
if (mp != NULL)
|
|
return (0);
|
|
|
|
/*
|
|
* We failed to mount (a new) root.
|
|
*/
|
|
switch (root_mount_onfail) {
|
|
case A_CONTINUE:
|
|
break;
|
|
case A_PANIC:
|
|
panic("mountroot: unable to (re-)mount root.");
|
|
/* NOTREACHED */
|
|
case A_RETRY:
|
|
goto retry;
|
|
case A_REBOOT:
|
|
kern_reboot(RB_NOSYNC);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
vfs_mountroot_conf0(struct sbuf *sb)
|
|
{
|
|
char *s, *tok, *mnt, *opt;
|
|
int error;
|
|
|
|
sbuf_printf(sb, ".onfail panic\n");
|
|
sbuf_printf(sb, ".timeout %d\n", root_mount_timeout);
|
|
if (boothowto & RB_ASKNAME)
|
|
sbuf_printf(sb, ".ask\n");
|
|
#ifdef ROOTDEVNAME
|
|
if (boothowto & RB_DFLTROOT)
|
|
sbuf_printf(sb, "%s\n", ROOTDEVNAME);
|
|
#endif
|
|
if (boothowto & RB_CDROM) {
|
|
sbuf_printf(sb, "cd9660:/dev/cd0 ro\n");
|
|
sbuf_printf(sb, ".timeout 0\n");
|
|
sbuf_printf(sb, "cd9660:/dev/acd0 ro\n");
|
|
sbuf_printf(sb, ".timeout %d\n", root_mount_timeout);
|
|
}
|
|
s = getenv("vfs.root.mountfrom");
|
|
if (s != NULL) {
|
|
opt = getenv("vfs.root.mountfrom.options");
|
|
tok = s;
|
|
error = parse_token(&tok, &mnt);
|
|
while (!error) {
|
|
sbuf_printf(sb, "%s %s\n", mnt,
|
|
(opt != NULL) ? opt : "");
|
|
free(mnt, M_TEMP);
|
|
error = parse_token(&tok, &mnt);
|
|
}
|
|
if (opt != NULL)
|
|
freeenv(opt);
|
|
freeenv(s);
|
|
}
|
|
if (rootdevnames[0] != NULL)
|
|
sbuf_printf(sb, "%s\n", rootdevnames[0]);
|
|
if (rootdevnames[1] != NULL)
|
|
sbuf_printf(sb, "%s\n", rootdevnames[1]);
|
|
#ifdef ROOTDEVNAME
|
|
if (!(boothowto & RB_DFLTROOT))
|
|
sbuf_printf(sb, "%s\n", ROOTDEVNAME);
|
|
#endif
|
|
if (!(boothowto & RB_ASKNAME))
|
|
sbuf_printf(sb, ".ask\n");
|
|
}
|
|
|
|
static int
|
|
vfs_mountroot_readconf(struct thread *td, struct sbuf *sb)
|
|
{
|
|
static char buf[128];
|
|
struct nameidata nd;
|
|
off_t ofs;
|
|
ssize_t resid;
|
|
int error, flags, len;
|
|
|
|
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td);
|
|
flags = FREAD;
|
|
error = vn_open(&nd, &flags, 0, NULL);
|
|
if (error)
|
|
return (error);
|
|
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
ofs = 0;
|
|
len = sizeof(buf) - 1;
|
|
while (1) {
|
|
error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
|
|
NOCRED, &resid, td);
|
|
if (error)
|
|
break;
|
|
if (resid == len)
|
|
break;
|
|
buf[len - resid] = 0;
|
|
sbuf_printf(sb, "%s", buf);
|
|
ofs += len - resid;
|
|
}
|
|
|
|
VOP_UNLOCK(nd.ni_vp, 0);
|
|
vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
vfs_mountroot_wait(void)
|
|
{
|
|
struct root_hold_token *h;
|
|
struct timeval lastfail;
|
|
int curfail;
|
|
|
|
curfail = 0;
|
|
while (1) {
|
|
DROP_GIANT();
|
|
g_waitidle();
|
|
PICKUP_GIANT();
|
|
mtx_lock(&root_holds_mtx);
|
|
if (LIST_EMPTY(&root_holds)) {
|
|
mtx_unlock(&root_holds_mtx);
|
|
break;
|
|
}
|
|
if (ppsratecheck(&lastfail, &curfail, 1)) {
|
|
printf("Root mount waiting for:");
|
|
LIST_FOREACH(h, &root_holds, list)
|
|
printf(" %s", h->who);
|
|
printf("\n");
|
|
}
|
|
msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold",
|
|
hz);
|
|
}
|
|
}
|
|
|
|
void
|
|
vfs_mountroot(void)
|
|
{
|
|
struct mount *mp;
|
|
struct sbuf *sb;
|
|
struct thread *td;
|
|
time_t timebase;
|
|
int error;
|
|
|
|
td = curthread;
|
|
|
|
vfs_mountroot_wait();
|
|
|
|
sb = sbuf_new_auto();
|
|
vfs_mountroot_conf0(sb);
|
|
sbuf_finish(sb);
|
|
|
|
error = vfs_mountroot_devfs(td, &mp);
|
|
while (!error) {
|
|
error = vfs_mountroot_parse(sb, mp);
|
|
if (!error) {
|
|
error = vfs_mountroot_shuffle(td, mp);
|
|
if (!error) {
|
|
sbuf_clear(sb);
|
|
error = vfs_mountroot_readconf(td, sb);
|
|
sbuf_finish(sb);
|
|
}
|
|
}
|
|
}
|
|
|
|
sbuf_delete(sb);
|
|
|
|
/*
|
|
* Iterate over all currently mounted file systems and use
|
|
* the time stamp found to check and/or initialize the RTC.
|
|
* Call inittodr() only once and pass it the largest of the
|
|
* timestamps we encounter.
|
|
*/
|
|
timebase = 0;
|
|
mtx_lock(&mountlist_mtx);
|
|
mp = TAILQ_FIRST(&mountlist);
|
|
while (mp != NULL) {
|
|
if (mp->mnt_time > timebase)
|
|
timebase = mp->mnt_time;
|
|
mp = TAILQ_NEXT(mp, mnt_list);
|
|
}
|
|
mtx_unlock(&mountlist_mtx);
|
|
inittodr(timebase);
|
|
|
|
/* Keep prison0's root in sync with the global rootvnode. */
|
|
mtx_lock(&prison0.pr_mtx);
|
|
prison0.pr_root = rootvnode;
|
|
vref(prison0.pr_root);
|
|
mtx_unlock(&prison0.pr_mtx);
|
|
|
|
mtx_lock(&root_holds_mtx);
|
|
atomic_store_rel_int(&root_mount_complete, 1);
|
|
wakeup(&root_mount_complete);
|
|
mtx_unlock(&root_holds_mtx);
|
|
|
|
EVENTHANDLER_INVOKE(mountroot);
|
|
}
|
|
|
|
static struct mntarg *
|
|
parse_mountroot_options(struct mntarg *ma, const char *options)
|
|
{
|
|
char *p;
|
|
char *name, *name_arg;
|
|
char *val, *val_arg;
|
|
char *opts;
|
|
|
|
if (options == NULL || options[0] == '\0')
|
|
return (ma);
|
|
|
|
p = opts = strdup(options, M_MOUNT);
|
|
if (opts == NULL) {
|
|
return (ma);
|
|
}
|
|
|
|
while((name = strsep(&p, ",")) != NULL) {
|
|
if (name[0] == '\0')
|
|
break;
|
|
|
|
val = strchr(name, '=');
|
|
if (val != NULL) {
|
|
*val = '\0';
|
|
++val;
|
|
}
|
|
if( strcmp(name, "rw") == 0 ||
|
|
strcmp(name, "noro") == 0) {
|
|
/*
|
|
* The first time we mount the root file system,
|
|
* we need to mount 'ro', so We need to ignore
|
|
* 'rw' and 'noro' mount options.
|
|
*/
|
|
continue;
|
|
}
|
|
name_arg = strdup(name, M_MOUNT);
|
|
val_arg = NULL;
|
|
if (val != NULL)
|
|
val_arg = strdup(val, M_MOUNT);
|
|
|
|
ma = mount_arg(ma, name_arg, val_arg,
|
|
(val_arg != NULL ? -1 : 0));
|
|
}
|
|
free(opts, M_MOUNT);
|
|
return (ma);
|
|
}
|