NetBSD/sys/miscfs/procfs/procfs_vfsops.c

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/* $NetBSD: procfs_vfsops.c,v 1.27 1998/02/18 07:05:48 thorpej Exp $ */
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/*
* Copyright (c) 1993 Jan-Simon Pendry
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
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*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
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* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
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*
* @(#)procfs_vfsops.c 8.5 (Berkeley) 6/15/94
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*/
/*
* procfs VFS interface
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*/
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#include <sys/param.h>
#include <sys/time.h>
#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/syslog.h>
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#include <sys/mount.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <miscfs/procfs/procfs.h>
#include <vm/vm.h> /* for PAGE_SIZE */
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int procfs_mount __P((struct mount *, const char *, void *,
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struct nameidata *, struct proc *));
int procfs_start __P((struct mount *, int, struct proc *));
int procfs_unmount __P((struct mount *, int, struct proc *));
int procfs_quotactl __P((struct mount *, int, uid_t, caddr_t,
struct proc *));
int procfs_statfs __P((struct mount *, struct statfs *, struct proc *));
int procfs_sync __P((struct mount *, int, struct ucred *, struct proc *));
int procfs_vget __P((struct mount *, ino_t, struct vnode **));
int procfs_fhtovp __P((struct mount *, struct fid *, struct mbuf *,
struct vnode **, int *, struct ucred **));
int procfs_vptofh __P((struct vnode *, struct fid *));
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/*
* VFS Operations.
*
* mount system call
*/
/* ARGSUSED */
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int
procfs_mount(mp, path, data, ndp, p)
struct mount *mp;
const char *path;
void *data;
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struct nameidata *ndp;
struct proc *p;
{
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size_t size;
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if (UIO_MX & (UIO_MX-1)) {
log(LOG_ERR, "procfs: invalid directory entry size");
return (EINVAL);
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}
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_data = 0;
getnewfsid(mp, makefstype(MOUNT_PROCFS));
(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN, &size);
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bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
bcopy("procfs", mp->mnt_stat.f_mntfromname, sizeof("procfs"));
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return (0);
}
/*
* unmount system call
*/
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int
procfs_unmount(mp, mntflags, p)
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struct mount *mp;
int mntflags;
struct proc *p;
{
int error;
extern int doforce;
int flags = 0;
if (mntflags & MNT_FORCE) {
/* procfs can never be rootfs so don't check for it */
if (!doforce)
return (EINVAL);
flags |= FORCECLOSE;
}
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if ((error = vflush(mp, 0, flags)) != 0)
return (error);
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return (0);
}
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int
procfs_root(mp, vpp)
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struct mount *mp;
struct vnode **vpp;
{
return (procfs_allocvp(mp, vpp, 0, Proot));
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}
/* ARGSUSED */
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int
procfs_start(mp, flags, p)
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struct mount *mp;
int flags;
struct proc *p;
{
return (0);
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}
/*
* Get file system statistics.
*/
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int
procfs_statfs(mp, sbp, p)
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struct mount *mp;
struct statfs *sbp;
struct proc *p;
{
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#ifdef COMPAT_09
sbp->f_type = 10;
#else
sbp->f_type = 0;
#endif
sbp->f_bsize = PAGE_SIZE;
sbp->f_iosize = PAGE_SIZE;
sbp->f_blocks = 1; /* avoid divide by zero in some df's */
sbp->f_bfree = 0;
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sbp->f_bavail = 0;
sbp->f_files = maxproc; /* approx */
sbp->f_ffree = maxproc - nprocs; /* approx */
if (sbp != &mp->mnt_stat) {
bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
}
strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
return (0);
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}
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/*ARGSUSED*/
int
procfs_quotactl(mp, cmds, uid, arg, p)
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struct mount *mp;
int cmds;
uid_t uid;
caddr_t arg;
struct proc *p;
{
return (EOPNOTSUPP);
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}
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/*ARGSUSED*/
int
procfs_sync(mp, waitfor, uc, p)
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struct mount *mp;
int waitfor;
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struct ucred *uc;
struct proc *p;
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{
return (0);
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}
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/*ARGSUSED*/
int
procfs_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
return (EOPNOTSUPP);
}
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/*ARGSUSED*/
int
procfs_fhtovp(mp, fhp, mb, vpp, what, anon)
struct mount *mp;
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struct fid *fhp;
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struct mbuf *mb;
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struct vnode **vpp;
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int *what;
struct ucred **anon;
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{
return (EINVAL);
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}
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/*ARGSUSED*/
int
procfs_vptofh(vp, fhp)
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struct vnode *vp;
struct fid *fhp;
{
return (EINVAL);
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}
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void
procfs_init()
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{
}
extern struct vnodeopv_desc procfs_vnodeop_opv_desc;
struct vnodeopv_desc *procfs_vnodeopv_descs[] = {
&procfs_vnodeop_opv_desc,
NULL,
};
struct vfsops procfs_vfsops = {
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MOUNT_PROCFS,
procfs_mount,
procfs_start,
procfs_unmount,
procfs_root,
procfs_quotactl,
procfs_statfs,
procfs_sync,
procfs_vget,
procfs_fhtovp,
procfs_vptofh,
procfs_init,
NULL, /* vfs_mountroot */
procfs_vnodeopv_descs,
};