BSD 4_4_Lite1 release

[unix-history] / usr / src / sys / miscfs / procfs / procfs_vfsops.c

/*
* Copyright (c) 1993 Jan-Simon Pendry
* Copyright (c) 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* 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.
*
*      @(#)procfs_vfsops.c     8.4 (Berkeley) 1/21/94
*
* From:
*      $Id: procfs_vfsops.c,v 3.1 1993/12/15 09:40:17 jsp Exp $
*/

/*
* procfs VFS interface
*/

#include <sys/param.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/syslog.h>
#include <sys/mount.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <miscfs/procfs/procfs.h>
#include <vm/vm.h>                      /* for PAGE_SIZE */

/*
* VFS Operations.
*
* mount system call
*/
/* ARGSUSED */
procfs_mount(mp, path, data, ndp, p)
       struct mount *mp;
       char *path;
       caddr_t data;
       struct nameidata *ndp;
       struct proc *p;
{
       u_int size;

       if (UIO_MX & (UIO_MX-1)) {
               log(LOG_ERR, "procfs: invalid directory entry size");
               return (EINVAL);
       }

       if (mp->mnt_flag & MNT_UPDATE)
               return (EOPNOTSUPP);

       mp->mnt_flag |= MNT_LOCAL;
       mp->mnt_data = 0;
       getnewfsid(mp, MOUNT_PROCFS);

       (void) copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname, MNAMELEN, &size);
       bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);

       size = sizeof("procfs") - 1;
       bcopy("procfs", mp->mnt_stat.f_mntfromname, size);
       bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);

       return (0);
}

/*
* unmount system call
*/
procfs_unmount(mp, mntflags, p)
       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;
       }

       if (error = vflush(mp, 0, flags))
               return (error);

       return (0);
}

procfs_root(mp, vpp)
       struct mount *mp;
       struct vnode **vpp;
{
       struct pfsnode *pfs;
       struct vnode *vp;
       int error;

       error = procfs_allocvp(mp, &vp, (pid_t) 0, Proot);
       if (error)
               return (error);

       vp->v_type = VDIR;
       vp->v_flag = VROOT;
       pfs = VTOPFS(vp);

       *vpp = vp;
       return (0);
}

/*
*/
/* ARGSUSED */
procfs_start(mp, flags, p)
       struct mount *mp;
       int flags;
       struct proc *p;
{

       return (0);
}

/*
* Get file system statistics.
*/
procfs_statfs(mp, sbp, p)
       struct mount *mp;
       struct statfs *sbp;
       struct proc *p;
{
       sbp->f_type = MOUNT_PROCFS;
       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;
       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);
       }

       return (0);
}


procfs_quotactl(mp, cmds, uid, arg, p)
       struct mount *mp;
       int cmds;
       uid_t uid;
       caddr_t arg;
       struct proc *p;
{

       return (EOPNOTSUPP);
}

procfs_sync(mp, waitfor)
       struct mount *mp;
       int waitfor;
{

       return (0);
}

procfs_vget(mp, ino, vpp)
       struct mount *mp;
       ino_t ino;
       struct vnode **vpp;
{

       return (EOPNOTSUPP);
}

procfs_fhtovp(mp, fhp, vpp)
       struct mount *mp;
       struct fid *fhp;
       struct vnode **vpp;
{

       return (EINVAL);
}

procfs_vptofh(vp, fhp)
       struct vnode *vp;
       struct fid *fhp;
{

       return EINVAL;
}

procfs_init()
{

       return (0);
}

struct vfsops procfs_vfsops = {
       procfs_mount,
       procfs_start,
       procfs_unmount,
       procfs_root,
       procfs_quotactl,
       procfs_statfs,
       procfs_sync,
       procfs_vget,
       procfs_fhtovp,
       procfs_vptofh,
       procfs_init,
};