185 lines
4.5 KiB
C
185 lines
4.5 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 2000
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* Poul-Henning Kamp. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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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. 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 REGENTS 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 REGENTS 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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* @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
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* From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36
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*
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* $FreeBSD$
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*/
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#include "opt_devfs.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <fs/devfs/devfs.h>
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MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data");
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static vfs_mount_t devfs_mount;
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static vfs_unmount_t devfs_unmount;
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static vfs_root_t devfs_root;
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static vfs_statfs_t devfs_statfs;
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/*
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* Mount the filesystem
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*/
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static int
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devfs_mount(struct mount *mp, struct thread *td)
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{
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int error;
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struct devfs_mount *fmp;
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struct vnode *rvp;
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error = 0;
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if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
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return (EOPNOTSUPP);
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MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount),
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M_DEVFS, M_WAITOK | M_ZERO);
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MALLOC(fmp->dm_dirent, struct devfs_dirent **,
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sizeof(struct devfs_dirent *) * NDEVFSINO,
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M_DEVFS, M_WAITOK | M_ZERO);
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lockinit(&fmp->dm_lock, PVFS, "devfs", 0, 0);
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_kern_flag |= MNTK_MPSAFE;
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#ifdef MAC
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mp->mnt_flag |= MNT_MULTILABEL;
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#endif
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fmp->dm_mount = mp;
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mp->mnt_data = (qaddr_t) fmp;
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vfs_getnewfsid(mp);
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fmp->dm_inode = DEVFSINOMOUNT;
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fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL);
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fmp->dm_rootdir->de_inode = 2;
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#ifdef MAC
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mac_create_devfs_directory(mp, "", 0, fmp->dm_rootdir);
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#endif
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fmp->dm_basedir = fmp->dm_rootdir;
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devfs_rules_newmount(fmp, td);
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error = devfs_root(mp, LK_EXCLUSIVE, &rvp, td);
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if (error) {
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lockdestroy(&fmp->dm_lock);
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FREE(fmp, M_DEVFS);
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return (error);
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}
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VOP_UNLOCK(rvp, 0, td);
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vfs_mountedfrom(mp, "devfs");
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return (0);
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}
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static int
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devfs_unmount(mp, mntflags, td)
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struct mount *mp;
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int mntflags;
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struct thread *td;
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{
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int error;
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int flags = 0;
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struct devfs_mount *fmp;
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fmp = VFSTODEVFS(mp);
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/* There is 1 extra root vnode reference from devfs_mount(). */
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error = vflush(mp, 1, flags, td);
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if (error)
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return (error);
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devfs_purge(fmp->dm_rootdir);
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mp->mnt_data = 0;
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lockdestroy(&fmp->dm_lock);
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free(fmp->dm_dirent, M_DEVFS);
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free(fmp, M_DEVFS);
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return 0;
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}
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/* Return locked reference to root. */
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static int
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devfs_root(mp, flags, vpp, td)
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struct mount *mp;
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int flags;
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struct vnode **vpp;
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struct thread *td;
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{
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int error;
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struct vnode *vp;
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struct devfs_mount *dmp;
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dmp = VFSTODEVFS(mp);
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error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td);
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if (error)
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return (error);
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vp->v_vflag |= VV_ROOT;
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*vpp = vp;
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return (0);
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}
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static int
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devfs_statfs(mp, sbp, td)
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struct mount *mp;
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struct statfs *sbp;
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struct thread *td;
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{
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sbp->f_flags = 0;
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sbp->f_bsize = DEV_BSIZE;
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sbp->f_iosize = DEV_BSIZE;
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sbp->f_blocks = 2; /* 1K to keep df happy */
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_files = 0;
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sbp->f_ffree = 0;
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return (0);
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}
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static struct vfsops devfs_vfsops = {
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.vfs_mount = devfs_mount,
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.vfs_root = devfs_root,
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.vfs_statfs = devfs_statfs,
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.vfs_unmount = devfs_unmount,
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};
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VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
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