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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup FileSystems
*
* @brief Mount a root file system.
*/
/*
* Copyright (C) 2020 Chris Johns <chris@contemporary.software>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/rtems-bsd-kernel-space.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/resourcevar.h>
#include <sys/vnode.h>
#include <vm/vm_extern.h>
struct vnode *rootvnode;
MALLOC_DECLARE(M_MOUNT);
static void
set_rootvnode(struct mount *mp)
{
struct proc *p;
int error;
error = VFS_ROOT(mp, LK_EXCLUSIVE, &rootvnode);
if (error != 0)
panic("Cannot find root vnode");
VOP_UNLOCK(rootvnode, 0);
p = curthread->td_proc;
FILEDESC_XLOCK(p->p_fd);
if (p->p_fd->fd_cdir != NULL)
vrele(p->p_fd->fd_cdir);
p->p_fd->fd_cdir = rootvnode;
VREF(rootvnode);
if (p->p_fd->fd_rdir != NULL)
vrele(p->p_fd->fd_rdir);
p->p_fd->fd_rdir = rootvnode;
VREF(rootvnode);
FILEDESC_XUNLOCK(p->p_fd);
}
static void
bsd_mountroot(const char *fstype)
{
struct vfsoptlist *opts;
struct vfsconf *vfsp;
struct mount *mp;
struct ucred *cred;
int error;
cred = crget();
cred->cr_uidinfo = uifind(0);
cred->cr_ruidinfo = uifind(0);
vfsp = vfs_byname(fstype);
if (vfsp != NULL) {
mp = vfs_mount_alloc(NULLVP, vfsp, "/", cred);
crfree(cred);
error = VFS_MOUNT(mp);
if (error != 0)
panic("Cannot mount root file system: %d", error);
error = VFS_STATFS(mp, &mp->mnt_stat);
if (error != 0)
panic("Cannot stat root file system: %d", error);
opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
TAILQ_INIT(opts);
mp->mnt_opt = opts;
mtx_lock(&mountlist_mtx);
TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
mtx_unlock(&mountlist_mtx);
set_rootvnode(mp);
}
}
static void
bsd_rootfs_init(const void *dummy)
{
bsd_mountroot("rootfs");
}
SYSINIT(bsdroot, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, bsd_rootfs_init, NULL);
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