NetBSD-5.0.2/sys/miscfs/portal/portal_vfsops.c
/* $NetBSD: portal_vfsops.c,v 1.76 2008/06/28 01:34:06 rumble 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. 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 8.11 (Berkeley) 5/14/95
*/
/*
* Portal Filesystem
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: portal_vfsops.c,v 1.76 2008/06/28 01:34:06 rumble Exp $");
#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/time.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/dirent.h>
#include <sys/un.h>
#include <sys/kauth.h>
#include <sys/module.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/portal/portal.h>
MODULE(MODULE_CLASS_VFS, portal, NULL);
VFS_PROTOS(portal);
static struct sysctllog *portal_sysctl_log;
void
portal_init()
{
}
void
portal_done()
{
}
/*
* Mount the per-process file descriptors (/dev/fd)
*/
int
portal_mount(
struct mount *mp,
const char *path,
void *data,
size_t *data_len)
{
struct lwp *l = curlwp;
struct file *fp;
struct portal_args *args = data;
struct portalmount *fmp;
struct socket *so;
struct vnode *rvp;
struct proc *p;
int error;
if (*data_len < sizeof *args)
return EINVAL;
p = l->l_proc;
if (mp->mnt_flag & MNT_GETARGS) {
fmp = VFSTOPORTAL(mp);
if (fmp == NULL)
return EIO;
args->pa_config = NULL;
args->pa_socket = 0; /* XXX */
*data_len = sizeof *args;
return 0;
}
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
/* getsock() will use the descriptor for us */
if ((fp = fd_getfile(args->pa_socket)) == NULL)
return (EBADF);
if (fp->f_type != DTYPE_SOCKET) {
fd_putfile(args->pa_socket);
return (ENOTSOCK);
}
so = (struct socket *) fp->f_data;
if (so->so_proto->pr_domain->dom_family != AF_LOCAL) {
fd_putfile(args->pa_socket);
return (ESOCKTNOSUPPORT);
}
error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */
if (error) {
fd_putfile(args->pa_socket);
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_vflag |= VV_ROOT;
VTOPORTAL(rvp)->pt_arg = 0;
VTOPORTAL(rvp)->pt_size = 0;
VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
fmp->pm_root = rvp;
fmp->pm_server = fp;
mutex_enter(&fp->f_lock);
fp->f_count++;
mutex_exit(&fp->f_lock);
fd_putfile(args->pa_socket);
mp->mnt_stat.f_namemax = MAXNAMLEN;
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_data = fmp;
vfs_getnewfsid(mp);
return set_statvfs_info(path, UIO_USERSPACE, args->pa_config,
UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l);
}
int
portal_start(struct mount *mp, int flags)
{
return (0);
}
int
portal_unmount(struct mount *mp, int mntflags)
{
struct vnode *rtvp = VFSTOPORTAL(mp)->pm_root;
int error, flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
if (rtvp->v_usecount > 1 && (mntflags & MNT_FORCE) == 0)
return (EBUSY);
if ((error = vflush(mp, rtvp, flags)) != 0)
return (error);
/*
* Blow it away for future re-use
*/
vgone(rtvp);
/*
* 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((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);
/*
* Finally, throw away the portalmount structure
*/
free(mp->mnt_data, M_UFSMNT); /* XXX */
mp->mnt_data = NULL;
return (0);
}
int
portal_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
struct vnode *vp;
/*
* Return locked reference to root.
*/
vp = VFSTOPORTAL(mp)->pm_root;
VREF(vp);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
*vpp = vp;
return (0);
}
int
portal_statvfs(struct mount *mp, struct statvfs *sbp)
{
sbp->f_bsize = DEV_BSIZE;
sbp->f_frsize = 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_bresvd = 0;
sbp->f_files = 1; /* Allow for "." */
sbp->f_ffree = 0; /* See comments above */
sbp->f_favail = 0; /* See comments above */
sbp->f_fresvd = 0;
copy_statvfs_info(sbp, mp);
return (0);
}
/*ARGSUSED*/
int
portal_sync(struct mount *mp, int waitfor,
kauth_cred_t uc)
{
return (0);
}
int
portal_vget(struct mount *mp, ino_t ino,
struct vnode **vpp)
{
return (EOPNOTSUPP);
}
extern const struct vnodeopv_desc portal_vnodeop_opv_desc;
const struct vnodeopv_desc * const portal_vnodeopv_descs[] = {
&portal_vnodeop_opv_desc,
NULL,
};
struct vfsops portal_vfsops = {
MOUNT_PORTAL,
sizeof (struct portal_args),
portal_mount,
portal_start,
portal_unmount,
portal_root,
(void *)eopnotsupp, /* vfs_quotactl */
portal_statvfs,
portal_sync,
portal_vget,
(void *)eopnotsupp, /* vfs_fhtovp */
(void *)eopnotsupp, /* vfs_vptofh */
portal_init,
NULL,
portal_done,
NULL, /* vfs_mountroot */
(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
vfs_stdextattrctl,
(void *)eopnotsupp, /* vfs_suspendctl */
genfs_renamelock_enter,
genfs_renamelock_exit,
(void *)eopnotsupp,
portal_vnodeopv_descs,
0,
{ NULL, NULL },
};
static int
portal_modcmd(modcmd_t cmd, void *arg)
{
int error;
switch (cmd) {
case MODULE_CMD_INIT:
error = vfs_attach(&portal_vfsops);
if (error != 0)
break;
sysctl_createv(&portal_sysctl_log, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "vfs", NULL,
NULL, 0, NULL, 0,
CTL_VFS, CTL_EOL);
sysctl_createv(&portal_sysctl_log, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "portal",
SYSCTL_DESCR("Portal daemon file system"),
NULL, 0, NULL, 0,
CTL_VFS, 8, CTL_EOL);
/*
* XXX the "8" above could be dynamic, thereby eliminating one
* more instance of the "number to vfs" mapping problem, but
* "8" is the order as taken from sys/mount.h
*/
break;
case MODULE_CMD_FINI:
error = vfs_detach(&portal_vfsops);
if (error != 0)
break;
sysctl_teardown(&portal_sysctl_log);
break;
default:
error = ENOTTY;
break;
}
return (error);
}