4.4BSD/usr/src/sys/miscfs/portal/portal_vfsops.c
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
* 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.
*
* @(#)portal_vfsops.c 8.1 (Berkeley) 6/10/93
*
* $Id: portal_vfsops.c,v 1.5 1992/05/30 10:25:27 jsp Exp jsp $
*/
/*
* 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>
static u_short portal_mntid;
int portal_init()
{
#ifdef PORTAL_DIAGNOSTIC
printf("portal_init\n"); /* printed during system boot */
#endif
}
/*
* Mount the per-process file descriptors (/dev/fd)
*/
portal_mount(mp, path, data, ndp, p)
struct mount *mp;
char *path;
caddr_t data;
struct nameidata *ndp;
struct proc *p;
{
int error = 0;
struct portal_args args;
u_int size;
struct portalmount *fmp;
struct vnode *rvp;
struct sockaddr_un *unp;
struct file *fp;
struct socket *so;
char cfile[MAXPATHLEN];
#ifdef PORTAL_DIAGNOSTIC
printf("portal_mount(mp = %x)\n", mp);
#endif
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
if (error = copyin(data, (caddr_t) &args, sizeof(struct portal_args)))
return (error);
if (error = getsock(p->p_fd, args.pa_socket, &fp))
return (error);
so = (struct socket *) fp->f_data;
if (so->so_proto->pr_domain->dom_family != AF_UNIX)
return (ESOCKTNOSUPPORT);
error = getnewvnode(VT_UFS, mp, portal_vnodeop_p, &rvp); /* XXX */
if (error)
return (error);
MALLOC(rvp->v_data, void *, sizeof(struct portalnode),
M_TEMP, M_WAITOK);
fmp = (struct portalmount *) malloc(sizeof(struct portalmount),
M_UFSMNT, M_WAITOK); /* XXX */
rvp->v_type = VDIR;
rvp->v_flag |= VROOT;
VTOPORTAL(rvp)->pt_arg = 0;
VTOPORTAL(rvp)->pt_size = 0;
VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
#ifdef PORTAL_DIAGNOSTIC
printf("portal_mount: root vp = %x\n", rvp);
#endif
fmp->pm_root = rvp;
fmp->pm_server = fp; fp->f_count++;
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_data = (qaddr_t) fmp;
getnewfsid(mp, MOUNT_PORTAL);
(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);
#ifdef notdef
bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
#endif
#ifdef PORTAL_DIAGNOSTIC
printf("portal_mount: config %s at %s\n",
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
#endif
return (0);
}
portal_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
return (0);
}
portal_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
int error;
int flags = 0;
extern int doforce;
struct vnode *rootvp = VFSTOPORTAL(mp)->pm_root;
#ifdef PORTAL_DIAGNOSTIC
printf("portal_unmount(mp = %x)\n", mp);
#endif
if (mntflags & MNT_FORCE) {
/* portal can never be rootfs so don't check for it */
if (!doforce)
return (EINVAL);
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
#ifdef PORTAL_DIAGNOSTIC
printf("portal_unmount: calling mntflushbuf\n");
#endif
mntflushbuf(mp, 0);
#ifdef PORTAL_DIAGNOSTIC
printf("portal_unmount: calling mntinvalbuf\n");
#endif
if (mntinvalbuf(mp, 1))
return (EBUSY);
#endif
if (rootvp->v_usecount > 1)
return (EBUSY);
#ifdef PORTAL_DIAGNOSTIC
printf("portal_unmount: calling vflush\n");
#endif
if (error = vflush(mp, rootvp, flags))
return (error);
#ifdef PORTAL_DIAGNOSTIC
vprint("portal root", rootvp);
#endif
/*
* Release reference on underlying root vnode
*/
vrele(rootvp);
/*
* And blow it away for future re-use
*/
vgone(rootvp);
/*
* 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.
*/
#ifdef PORTAL_DIAGNOSTIC
printf("portal_unmount: shutdown socket\n");
#endif
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.
*/
#ifdef PORTAL_DIAGNOSTIC
printf("portal_unmount: closef(%x)\n", VFSTOPORTAL(mp)->pm_server);
#endif
closef(VFSTOPORTAL(mp)->pm_server, (struct proc *) 0);
/*
* Finally, throw away the portalmount structure
*/
free(mp->mnt_data, M_UFSMNT); /* XXX */
mp->mnt_data = 0;
return (0);
}
portal_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
struct vnode *vp;
int error;
#ifdef PORTAL_DIAGNOSTIC
printf("portal_root(mp = %x)\n", mp);
#endif
/*
* Return locked reference to root.
*/
vp = VFSTOPORTAL(mp)->pm_root;
VREF(vp);
VOP_LOCK(vp);
*vpp = vp;
return (0);
}
portal_quotactl(mp, cmd, uid, arg, p)
struct mount *mp;
int cmd;
uid_t uid;
caddr_t arg;
struct proc *p;
{
return (EOPNOTSUPP);
}
portal_statfs(mp, sbp, p)
struct mount *mp;
struct statfs *sbp;
struct proc *p;
{
struct filedesc *fdp;
int lim;
int i;
int last;
int freefd;
#ifdef PORTAL_DIAGNOSTIC
printf("portal_statfs(mp = %x)\n", mp);
#endif
sbp->f_type = MOUNT_PORTAL;
sbp->f_flags = 0;
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);
}
return (0);
}
portal_sync(mp, waitfor)
struct mount *mp;
int waitfor;
{
return (0);
}
portal_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
return (EOPNOTSUPP);
}
portal_fhtovp(mp, fhp, vpp)
struct mount *mp;
struct fid *fhp;
struct vnode **vpp;
{
return (EOPNOTSUPP);
}
portal_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
return (EOPNOTSUPP);
}
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,
};