NetBSD/sys/miscfs/fdesc/fdesc_vfsops.c

353 lines
8.0 KiB
C

/* $NetBSD: fdesc_vfsops.c,v 1.33 2001/05/30 11:57:16 mrg Exp $ */
/*
* Copyright (c) 1992, 1993, 1995
* 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. 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.
*
* @(#)fdesc_vfsops.c 8.10 (Berkeley) 5/14/95
*
* #Id: fdesc_vfsops.c,v 1.9 1993/04/06 15:28:33 jsp Exp #
*/
/*
* /dev/fd Filesystem
*/
#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif
#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 __P((struct mount *, const char *, void *,
struct nameidata *, struct proc *));
int fdesc_start __P((struct mount *, int, struct proc *));
int fdesc_unmount __P((struct mount *, int, struct proc *));
int fdesc_quotactl __P((struct mount *, int, uid_t, caddr_t,
struct proc *));
int fdesc_statfs __P((struct mount *, struct statfs *, struct proc *));
int fdesc_sync __P((struct mount *, int, struct ucred *, struct proc *));
int fdesc_vget __P((struct mount *, ino_t, struct vnode **));
int fdesc_fhtovp __P((struct mount *, struct fid *, struct vnode **));
int fdesc_checkexp __P((struct mount *, struct mbuf *, int *,
struct ucred **));
int fdesc_vptofh __P((struct vnode *, struct fid *));
int fdesc_sysctl __P((int *, u_int, void *, size_t *, void *, size_t,
struct proc *));
/*
* 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;
{
int error = 0;
size_t size;
struct fdescmount *fmp;
struct vnode *rvp;
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
if (error)
return (error);
MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
M_UFSMNT, M_WAITOK); /* XXX */
rvp->v_type = VDIR;
rvp->v_flag |= VROOT;
fmp->f_root = rvp;
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_data = (qaddr_t)fmp;
vfs_getnewfsid(mp);
(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size);
memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN);
memcpy(mp->mnt_stat.f_mntfromname, "fdesc", sizeof("fdesc"));
VOP_UNLOCK(rvp, 0);
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 error;
int flags = 0;
struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
/*
* Clear out buffer cache. I don't think we
* ever get anything cached at this level at the
* moment, but who knows...
*/
if (rootvp->v_usecount > 1)
return (EBUSY);
if ((error = vflush(mp, rootvp, flags)) != 0)
return (error);
/*
* Release reference on underlying root vnode
*/
vrele(rootvp);
/*
* And blow it away for future re-use
*/
vgone(rootvp);
/*
* Finally, throw away the fdescmount structure
*/
free(mp->mnt_data, M_UFSMNT); /* XXX */
mp->mnt_data = 0;
return (0);
}
int
fdesc_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
struct vnode *vp;
/*
* Return locked reference to root.
*/
vp = VFSTOFDESC(mp)->f_root;
VREF(vp);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
*vpp = vp;
return (0);
}
int
fdesc_quotactl(mp, cmd, uid, arg, p)
struct mount *mp;
int cmd;
uid_t uid;
caddr_t arg;
struct proc *p;
{
return (EOPNOTSUPP);
}
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 */
#ifdef COMPAT_09
sbp->f_type = 6;
#else
sbp->f_type = 0;
#endif
if (sbp != &mp->mnt_stat) {
memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid));
memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN);
memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN);
}
strncpy(sbp->f_fstypename, mp->mnt_op->vfs_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);
}
/*
* Fdesc flat namespace lookup.
* Currently unsupported.
*/
int
fdesc_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
return (EOPNOTSUPP);
}
/*ARGSUSED*/
int
fdesc_fhtovp(mp, fhp, vpp)
struct mount *mp;
struct fid *fhp;
struct vnode **vpp;
{
return (EOPNOTSUPP);
}
/*ARGSUSED*/
int
fdesc_checkexp(mp, nam, exflagsp, credanonp)
struct mount *mp;
struct mbuf *nam;
int *exflagsp;
struct ucred **credanonp;
{
return (EOPNOTSUPP);
}
/*ARGSUSED*/
int
fdesc_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
return (EOPNOTSUPP);
}
int
fdesc_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
return (EOPNOTSUPP);
}
extern const struct vnodeopv_desc fdesc_vnodeop_opv_desc;
const struct vnodeopv_desc * const fdesc_vnodeopv_descs[] = {
&fdesc_vnodeop_opv_desc,
NULL,
};
struct vfsops fdesc_vfsops = {
MOUNT_FDESC,
fdesc_mount,
fdesc_start,
fdesc_unmount,
fdesc_root,
fdesc_quotactl,
fdesc_statfs,
fdesc_sync,
fdesc_vget,
fdesc_fhtovp,
fdesc_vptofh,
fdesc_init,
fdesc_done,
fdesc_sysctl,
NULL, /* vfs_mountroot */
fdesc_checkexp,
fdesc_vnodeopv_descs,
};