f3a90da995
An initial tidyup of the mount() syscall and VFS mount code. This code replaces the earlier work done by jlemon in an attempt to make linux_mount() work. * the guts of the mount work has been moved into vfs_mount(). * move `type', `path' and `flags' from being userland variables into being kernel variables in vfs_mount(). `data' remains a pointer into userspace. * Attempt to verify the `type' and `path' strings passed to vfs_mount() aren't too long. * rework mount() and linux_mount() to take the userland parameters (besides data, as mentioned) and pass kernel variables to vfs_mount(). (linux_mount() already did this, I've just tidied it up a little more.) * remove the copyin*() stuff for `path'. `data' still requires copyin*() since its a pointer into userland. * set `mount->mnt_statf_mntonname' in vfs_mount() rather than in each filesystem. This variable is generally initialised with `path', and each filesystem can override it if they want to. * NOTE: f_mntonname is intiailised with "/" in the case of a root mount.
207 lines
5.0 KiB
C
207 lines
5.0 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 <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/vnode.h>
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#include <sys/mount.h>
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#include <sys/malloc.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 int devfs_mount __P((struct mount *mp, char *path, caddr_t data,
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struct nameidata *ndp, struct proc *p));
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static int devfs_unmount __P((struct mount *mp, int mntflags,
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struct proc *p));
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static int devfs_root __P((struct mount *mp, struct vnode **vpp));
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static int devfs_statfs __P((struct mount *mp, struct statfs *sbp,
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struct proc *p));
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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(mp, path, data, ndp, p)
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struct mount *mp;
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char *path;
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caddr_t data;
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struct nameidata *ndp;
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struct proc *p;
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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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/*
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* XXX: flag changes.
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*/
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if (mp->mnt_flag & MNT_UPDATE)
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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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lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE);
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mp->mnt_flag |= MNT_LOCAL;
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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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fmp->dm_basedir = fmp->dm_rootdir;
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error = devfs_root(mp, &rvp);
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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, p);
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bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
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bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs"));
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(void)devfs_statfs(mp, &mp->mnt_stat, p);
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return (0);
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}
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static int
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devfs_unmount(mp, mntflags, p)
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struct mount *mp;
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int mntflags;
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struct proc *p;
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{
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int error;
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int flags = 0;
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struct vnode *rootvp;
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struct devfs_mount *fmp;
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error = devfs_root(mp, &rootvp);
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if (error)
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return (error);
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fmp = VFSTODEVFS(mp);
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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if (rootvp->v_usecount > 2) {
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vrele(rootvp);
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return (EBUSY);
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}
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error = vflush(mp, rootvp, flags);
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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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vput(rootvp);
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vrele(rootvp);
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vgone(rootvp);
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mp->mnt_data = 0;
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lockdestroy(&fmp->dm_lock);
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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, vpp)
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struct mount *mp;
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struct vnode **vpp;
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{
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int error;
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struct proc *p;
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struct vnode *vp;
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struct devfs_mount *dmp;
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p = curproc; /* XXX */
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dmp = VFSTODEVFS(mp);
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error = devfs_allocv(dmp->dm_rootdir, mp, &vp, p);
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if (error)
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return (error);
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vp->v_flag |= VROOT;
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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, p)
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struct mount *mp;
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struct statfs *sbp;
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struct proc *p;
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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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if (sbp != &mp->mnt_stat) {
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sbp->f_type = mp->mnt_vfc->vfc_typenum;
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bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
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bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
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bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
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}
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return (0);
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}
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static struct vfsops devfs_vfsops = {
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devfs_mount,
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vfs_stdstart,
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devfs_unmount,
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devfs_root,
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vfs_stdquotactl,
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devfs_statfs,
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vfs_stdsync,
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vfs_stdvget,
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vfs_stdfhtovp,
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vfs_stdcheckexp,
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vfs_stdvptofh,
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vfs_stdinit,
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vfs_stduninit,
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vfs_stdextattrctl,
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};
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VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
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