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/* $OpenBSD: fdesc_vfsops.c,v 1.13 2003/08/14 07:46:39 mickey Exp $ */
/* $NetBSD: fdesc_vfsops.c,v 1.21 1996/02/09 22:40:07 christos Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated 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. 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.
*
* @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
*
* #Id: fdesc_vfsops.c,v 1.9 1993/04/06 15:28:33 jsp Exp #
*/
/*
* /dev/fd Filesystem
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/filedesc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <miscfs/fdesc/fdesc.h>
int fdesc_mount(struct mount *, const char *, void *,
struct nameidata *, struct proc *);
int fdesc_start(struct mount *, int, struct proc *);
int fdesc_unmount(struct mount *, int, struct proc *);
int fdesc_root(struct mount *, struct vnode **);
int fdesc_quotactl(struct mount *, int, uid_t, caddr_t,
struct proc *);
int fdesc_statfs(struct mount *, struct statfs *, struct proc *);
int fdesc_sync(struct mount *, int, struct ucred *, struct proc *);
int fdesc_vget(struct mount *, ino_t, struct vnode **);
int fdesc_fhtovp(struct mount *, struct fid *, struct vnode **);
int fdesc_vptofh(struct vnode *, struct fid *);
/*
* Mount the per-process file descriptors (/dev/fd)
*/
int
fdesc_mount(mp, path, data, ndp, p)
struct mount *mp;
const char *path;
void *data;
struct nameidata *ndp;
struct proc *p;
{
size_t size;
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
mp->mnt_flag |= MNT_LOCAL;
vfs_getnewfsid(mp);
(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
return (0);
}
int
fdesc_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
return (0);
}
int
fdesc_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
int flags = 0;
int error;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
/*
* Flush out our vnodes.
*/
if ((error = vflush(mp, NULL, flags)) != 0)
return (error);
return (0);
}
int
fdesc_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
struct vnode *vp;
int error;
/*
* Return locked reference to root.
*/
error = fdesc_allocvp(Froot, FD_ROOT, mp, &vp);
if (error)
return (error);
vp->v_type = VDIR;
vp->v_flag |= VROOT;
*vpp = vp;
return (0);
}
int
fdesc_statfs(mp, sbp, p)
struct mount *mp;
struct statfs *sbp;
struct proc *p;
{
struct filedesc *fdp;
int lim;
int i;
int last;
int freefd;
/*
* Compute number of free file descriptors.
* [ Strange results will ensue if the open file
* limit is ever reduced below the current number
* of open files... ]
*/
lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
fdp = p->p_fd;
last = min(fdp->fd_nfiles, lim);
freefd = 0;
for (i = fdp->fd_freefile; i < last; i++)
if (fdp->fd_ofiles[i] == NULL)
freefd++;
/*
* Adjust for the fact that the fdesc array may not
* have been fully allocated yet.
*/
if (fdp->fd_nfiles < lim)
freefd += (lim - fdp->fd_nfiles);
sbp->f_bsize = DEV_BSIZE;
sbp->f_iosize = DEV_BSIZE;
sbp->f_blocks = 2; /* 1K to keep df happy */
sbp->f_bfree = 0;
sbp->f_bavail = 0;
sbp->f_files = lim + 1; /* Allow for "." */
sbp->f_ffree = freefd; /* See comments above */
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_vfc->vfc_name, MFSNAMELEN);
return (0);
}
/*ARGSUSED*/
int
fdesc_sync(mp, waitfor, uc, p)
struct mount *mp;
int waitfor;
struct ucred *uc;
struct proc *p;
{
return (0);
}
#define fdesc_fhtovp ((int (*)(struct mount *, struct fid *, \
struct vnode **))eopnotsupp)
#define fdesc_quotactl ((int (*)(struct mount *, int, uid_t, caddr_t, \
struct proc *))eopnotsupp)
#define fdesc_sysctl ((int (*)(int *, u_int, void *, size_t *, void *, \
size_t, struct proc *))eopnotsupp)
#define fdesc_vget ((int (*)(struct mount *, ino_t, struct vnode **)) \
eopnotsupp)
#define fdesc_vptofh ((int (*)(struct vnode *, struct fid *))eopnotsupp)
#define fdesc_checkexp ((int (*)(struct mount *, struct mbuf *, \
int *, struct ucred **))eopnotsupp)
const struct vfsops fdesc_vfsops = {
fdesc_mount,
fdesc_start,
fdesc_unmount,
fdesc_root,
fdesc_quotactl,
fdesc_statfs,
fdesc_sync,
fdesc_vget,
fdesc_fhtovp,
fdesc_vptofh,
fdesc_init,
fdesc_sysctl,
fdesc_checkexp
};
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