FreeBSD-5.3/sys/fs/portalfs/portal_vfsops.c
/*
* 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.
* 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 8.11 (Berkeley) 5/14/95
*
* $FreeBSD: src/sys/fs/portalfs/portal_vfsops.c,v 1.51 2004/07/30 22:08:50 phk Exp $
*/
/*
* Portal Filesystem
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/domain.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/malloc.h>
#include <sys/file.h> /* Must come after sys/malloc.h */
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/vnode.h>
#include <fs/portalfs/portal.h>
static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure");
static vfs_omount_t portal_omount;
static vfs_unmount_t portal_unmount;
static vfs_root_t portal_root;
static vfs_statfs_t portal_statfs;
/*
* Mount the per-process file descriptors (/dev/fd)
*/
static int
portal_omount(mp, path, data, td)
struct mount *mp;
char *path;
caddr_t data;
struct thread *td;
{
struct file *fp;
struct portal_args args;
struct portalmount *fmp;
struct socket *so;
struct vnode *rvp;
struct portalnode *pn;
size_t size;
int error;
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
error = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
if (error)
return (error);
if ((error = fget(td, args.pa_socket, &fp)) != 0)
return (error);
if (fp->f_type != DTYPE_SOCKET) {
fdrop(fp, td);
return(ENOTSOCK);
}
so = fp->f_data; /* XXX race against userland */
if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
fdrop(fp, td);
return (ESOCKTNOSUPPORT);
}
MALLOC(pn, struct portalnode *, sizeof(struct portalnode),
M_TEMP, M_WAITOK);
MALLOC(fmp, struct portalmount *, sizeof(struct portalmount),
M_PORTALFSMNT, M_WAITOK); /* XXX */
error = getnewvnode("portal", mp, portal_vnodeop_p, &rvp); /* XXX */
if (error) {
FREE(fmp, M_PORTALFSMNT);
FREE(pn, M_TEMP);
fdrop(fp, td);
return (error);
}
rvp->v_data = pn;
rvp->v_type = VDIR;
rvp->v_vflag |= VV_ROOT;
VTOPORTAL(rvp)->pt_arg = 0;
VTOPORTAL(rvp)->pt_size = 0;
VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
fmp->pm_root = rvp;
fhold(fp);
fmp->pm_server = fp;
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_data = (qaddr_t) fmp;
vfs_getnewfsid(mp);
(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
(void)portal_statfs(mp, &mp->mnt_stat, td);
fdrop(fp, td);
return (0);
}
static int
portal_unmount(mp, mntflags, td)
struct mount *mp;
int mntflags;
struct thread *td;
{
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
/* There is 1 extra root vnode reference (pm_root). */
error = vflush(mp, 1, flags, td);
if (error)
return (error);
/*
* 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.
*/
soshutdown(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, (struct thread *) 0);
/*
* Finally, throw away the portalmount structure
*/
free(mp->mnt_data, M_PORTALFSMNT); /* XXX */
mp->mnt_data = 0;
return (0);
}
static int
portal_root(mp, vpp, td)
struct mount *mp;
struct vnode **vpp;
struct thread *td;
{
struct vnode *vp;
/*
* Return locked reference to root.
*/
vp = VFSTOPORTAL(mp)->pm_root;
VREF(vp);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
*vpp = vp;
return (0);
}
static int
portal_statfs(mp, sbp, td)
struct mount *mp;
struct statfs *sbp;
struct thread *td;
{
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) {
sbp->f_type = mp->mnt_vfc->vfc_typenum;
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);
}
static struct vfsops portal_vfsops = {
.vfs_omount = portal_omount,
.vfs_root = portal_root,
.vfs_statfs = portal_statfs,
.vfs_unmount = portal_unmount,
};
VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC);