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https://git.rtems.org/rtems-libbsd/
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6514d56158
- Refactor the libio interface - Move syscalls into an rtemsbsd location - Provide a root directory mount point Update #4475
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup FileSystems
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*
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* @brief Mount a root file system.
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*/
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/*
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* Copyright (C) 2020 Chris Johns <chris@contemporary.software>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/rtems-bsd-kernel-space.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/mount.h>
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#include <sys/resourcevar.h>
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#include <sys/vnode.h>
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#include <vm/vm_extern.h>
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struct vnode *rootvnode;
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MALLOC_DECLARE(M_MOUNT);
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static void
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set_rootvnode(struct mount *mp)
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{
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struct proc *p;
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int error;
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error = VFS_ROOT(mp, LK_EXCLUSIVE, &rootvnode);
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if (error != 0)
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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 void
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bsd_mountroot(const char *fstype)
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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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struct ucred *cred;
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int error;
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cred = crget();
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cred->cr_uidinfo = uifind(0);
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cred->cr_ruidinfo = uifind(0);
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vfsp = vfs_byname(fstype);
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if (vfsp != NULL) {
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mp = vfs_mount_alloc(NULLVP, vfsp, "/", cred);
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crfree(cred);
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error = VFS_MOUNT(mp);
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if (error != 0)
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panic("Cannot mount root file system: %d", error);
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error = VFS_STATFS(mp, &mp->mnt_stat);
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if (error != 0)
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panic("Cannot stat root file system: %d", 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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set_rootvnode(mp);
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}
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}
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static void
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bsd_rootfs_init(const void *dummy)
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{
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bsd_mountroot("rootfs");
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}
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SYSINIT(bsdroot, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, bsd_rootfs_init, NULL);
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