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/* $OpenBSD: portal_vfsops.c,v 1.22 2007/10/29 15:38:00 chl Exp $ */
/* $NetBSD: portal_vfsops.c,v 1.14 1996/02/09 22:40:41 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.
*
* from: Id: portal_vfsops.c,v 1.5 1992/05/30 10:25:27 jsp Exp
* @(#)portal_vfsops.c 8.6 (Berkeley) 1/21/94
*/
/*
* Portal Filesystem
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/un.h>
#include <miscfs/portal/portal.h>
#define portal_init ((int (*)(struct vfsconf *))nullop)
int portal_mount(struct mount *, const char *, void *,
struct nameidata *, struct proc *);
int portal_start(struct mount *, int, struct proc *);
int portal_unmount(struct mount *, int, struct proc *);
int portal_root(struct mount *, struct vnode **);
int portal_statfs(struct mount *, struct statfs *, struct proc *);
/*
* Mount the per-process file descriptors (/dev/fd)
*/
int
portal_mount(struct mount *mp, const char *path, void *data, struct nameidata *ndp,
struct proc *p)
{
struct file *fp;
struct portal_args args;
struct portalmount *fmp;
struct socket *so;
struct vnode *rvp;
size_t size;
int error;
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
error = copyin(data, &args, sizeof(struct portal_args));
if (error)
return (error);
if ((error = getsock(p->p_fd, args.pa_socket, &fp)) != 0)
return (error);
so = (struct socket *) fp->f_data;
if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
FRELE(fp);
return (ESOCKTNOSUPPORT);
}
error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */
if (error) {
FRELE(fp);
return (error);
}
rvp->v_data = malloc(sizeof(struct portalnode), M_TEMP, M_WAITOK);
fmp = (struct portalmount *) malloc(sizeof(struct portalmount),
M_MISCFSMNT, M_WAITOK);
rvp->v_type = VDIR;
rvp->v_flag |= VROOT;
VTOPORTAL(rvp)->pt_arg = 0;
VTOPORTAL(rvp)->pt_size = 0;
VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
fmp->pm_root = rvp;
fmp->pm_server = fp;
fp->f_count++;
FRELE(fp);
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_data = fmp;
vfs_getnewfsid(mp);
(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
(void) copyinstr(args.pa_config, mp->mnt_stat.f_mntfromname,
MNAMELEN - 1, &size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
return (0);
}
int
portal_start(struct mount *mp, int flags, struct proc *p)
{
return (0);
}
int
portal_unmount(struct mount *mp, int mntflags, struct proc *p)
{
struct vnode *rvp = VFSTOPORTAL(mp)->pm_root;
int error, flags = 0;
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...
*/
#ifdef notyet
mntflushbuf(mp, 0);
if (mntinvalbuf(mp, 1))
return (EBUSY);
#endif
if (rvp->v_usecount > 1 && !(flags & FORCECLOSE))
return (EBUSY);
if ((error = vflush(mp, rvp, flags)) != 0)
return (error);
/*
* Release reference on underlying root vnode
*/
vrele(rvp);
/*
* And blow it away for future re-use
*/
vgone(rvp);
/*
* Shutdown the socket. This will cause the select in the
* daemon to wake up, and then the accept will get ECONNABORTED
* which it interprets as a request to go and bury itself.
*/
FREF(VFSTOPORTAL(mp)->pm_server);
soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2);
/*
* Discard reference to underlying file. Must call closef because
* this may be the last reference.
*/
closef(VFSTOPORTAL(mp)->pm_server, NULL);
/*
* Finally, throw away the portalmount structure
*/
free(mp->mnt_data, M_MISCFSMNT);
mp->mnt_data = 0;
return (0);
}
int
portal_root(struct mount *mp, struct vnode **vpp)
{
struct vnode *vp;
struct proc *p = curproc;
/*
* Return locked reference to root.
*/
vp = VFSTOPORTAL(mp)->pm_root;
VREF(vp);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
*vpp = vp;
return (0);
}
int
portal_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
{
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 = 1; /* Allow for "." */
sbp->f_ffree = 0; /* 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);
}
#define portal_sync ((int (*)(struct mount *, int, struct ucred *, \
struct proc *))nullop)
#define portal_fhtovp ((int (*)(struct mount *, struct fid *, \
struct vnode **))eopnotsupp)
#define portal_quotactl ((int (*)(struct mount *, int, uid_t, caddr_t, \
struct proc *))eopnotsupp)
#define portal_sysctl ((int (*)(int *, u_int, void *, size_t *, void *, \
size_t, struct proc *))eopnotsupp)
#define portal_vget ((int (*)(struct mount *, ino_t, struct vnode **)) \
eopnotsupp)
#define portal_vptofh ((int (*)(struct vnode *, struct fid *))eopnotsupp)
#define portal_checkexp ((int (*)(struct mount *, struct mbuf *, \
int *, struct ucred **))eopnotsupp)
const struct vfsops portal_vfsops = {
portal_mount,
portal_start,
portal_unmount,
portal_root,
portal_quotactl,
portal_statfs,
portal_sync,
portal_vget,
portal_fhtovp,
portal_vptofh,
portal_init,
portal_sysctl,
portal_checkexp
};
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