freebsd-skq/sys/fs/portalfs/portal_vnops.c

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/*
* 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. 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_vnops.c 8.14 (Berkeley) 5/21/95
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*
* $Id: portal_vnops.c,v 1.21 1997/09/14 02:57:57 peter Exp $
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*/
/*
* Portal Filesystem
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
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#include <sys/kernel.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/unistd.h>
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#include <sys/vnode.h>
#include <sys/fcntl.h>
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#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/un.h>
#include <miscfs/portal/portal.h>
static int portal_fileid = PORTAL_ROOTFILEID+1;
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static int portal_badop __P((void));
static void portal_closefd __P((struct proc *p, int fd));
static int portal_connect __P((struct socket *so, struct socket *so2));
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static int portal_enotsupp __P((void));
static int portal_getattr __P((struct vop_getattr_args *ap));
static int portal_inactive __P((struct vop_inactive_args *ap));
static int portal_lookup __P((struct vop_lookup_args *ap));
static int portal_open __P((struct vop_open_args *ap));
static int portal_pathconf __P((struct vop_pathconf_args *ap));
static int portal_print __P((struct vop_print_args *ap));
static int portal_readdir __P((struct vop_readdir_args *ap));
static int portal_reclaim __P((struct vop_reclaim_args *ap));
static int portal_setattr __P((struct vop_setattr_args *ap));
static int portal_vfree __P((struct vop_vfree_args *ap));
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static void
portal_closefd(p, fd)
struct proc *p;
int fd;
{
int error;
struct close_args ua;
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int rc;
ua.fd = fd;
error = close(p, &ua, &rc);
/*
* We should never get an error, and there isn't anything
* we could do if we got one, so just print a message.
*/
if (error)
printf("portal_closefd: error = %d\n", error);
}
/*
* vp is the current namei directory
* cnp is the name to locate in that directory...
*/
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static int
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portal_lookup(ap)
struct vop_lookup_args /* {
struct vnode * a_dvp;
struct vnode ** a_vpp;
struct componentname * a_cnp;
} */ *ap;
{
struct componentname *cnp = ap->a_cnp;
struct vnode **vpp = ap->a_vpp;
struct vnode *dvp = ap->a_dvp;
char *pname = cnp->cn_nameptr;
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struct portalnode *pt;
int error;
struct vnode *fvp = 0;
char *path;
int size;
*vpp = NULLVP;
if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
return (EROFS);
if (cnp->cn_namelen == 1 && *pname == '.') {
*vpp = dvp;
VREF(dvp);
/*VOP_LOCK(dvp);*/
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return (0);
}
/*
* Do the MALLOC before the getnewvnode since doing so afterward
* might cause a bogus v_data pointer to get dereferenced
* elsewhere if MALLOC should block.
*/
MALLOC(pt, struct portalnode *, sizeof(struct portalnode),
M_TEMP, M_WAITOK);
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error = getnewvnode(VT_PORTAL, dvp->v_mount, portal_vnodeop_p, &fvp);
if (error) {
FREE(pt, M_TEMP);
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goto bad;
}
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fvp->v_type = VREG;
fvp->v_data = pt;
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/*
* Save all of the remaining pathname and
* advance the namei next pointer to the end
* of the string.
*/
for (size = 0, path = pname; *path; path++)
size++;
cnp->cn_consume = size - cnp->cn_namelen;
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pt->pt_arg = malloc(size+1, M_TEMP, M_WAITOK);
pt->pt_size = size+1;
bcopy(pname, pt->pt_arg, pt->pt_size);
pt->pt_fileid = portal_fileid++;
*vpp = fvp;
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/*VOP_LOCK(fvp);*/
return (0);
bad:;
if (fvp)
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vrele(fvp);
return (error);
}
static int
portal_connect(so, so2)
struct socket *so;
struct socket *so2;
{
/* from unp_connect, bypassing the namei stuff... */
struct socket *so3;
struct unpcb *unp2;
struct unpcb *unp3;
if (so2 == 0)
return (ECONNREFUSED);
if (so->so_type != so2->so_type)
return (EPROTOTYPE);
if ((so2->so_options & SO_ACCEPTCONN) == 0)
return (ECONNREFUSED);
if ((so3 = sonewconn(so2, 0)) == 0)
return (ECONNREFUSED);
unp2 = sotounpcb(so2);
unp3 = sotounpcb(so3);
if (unp2->unp_addr)
unp3->unp_addr = (struct sockaddr_un *)
dup_sockaddr((struct sockaddr *)unp2->unp_addr, 0);
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so2 = so3;
return (unp_connect2(so, so2));
}
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static int
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portal_open(ap)
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct socket *so = 0;
struct portalnode *pt;
struct proc *p = ap->a_p;
struct vnode *vp = ap->a_vp;
int s;
struct uio auio;
struct iovec aiov[2];
int res;
struct mbuf *cm = 0;
struct cmsghdr *cmsg;
int newfds;
int *ip;
int fd;
int error;
int len;
struct portalmount *fmp;
struct file *fp;
struct portal_cred pcred;
/*
* Nothing to do when opening the root node.
*/
if (vp->v_flag & VROOT)
return (0);
/*
* Can't be opened unless the caller is set up
* to deal with the side effects. Check for this
* by testing whether the p_dupfd has been set.
*/
if (p->p_dupfd >= 0)
return (ENODEV);
pt = VTOPORTAL(vp);
fmp = VFSTOPORTAL(vp->v_mount);
/*
* Create a new socket.
*/
error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, ap->a_p);
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if (error)
goto bad;
/*
* Reserve some buffer space
*/
res = pt->pt_size + sizeof(pcred) + 512; /* XXX */
error = soreserve(so, res, res);
if (error)
goto bad;
/*
* Kick off connection
*/
error = portal_connect(so, (struct socket *)fmp->pm_server->f_data);
if (error)
goto bad;
/*
* Wait for connection to complete
*/
/*
* XXX: Since the mount point is holding a reference on the
* underlying server socket, it is not easy to find out whether
* the server process is still running. To handle this problem
* we loop waiting for the new socket to be connected (something
* which will only happen if the server is still running) or for
* the reference count on the server socket to drop to 1, which
* will happen if the server dies. Sleep for 5 second intervals
* and keep polling the reference count. XXX.
*/
s = splnet();
while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
if (fmp->pm_server->f_count == 1) {
error = ECONNREFUSED;
splx(s);
goto bad;
}
(void) tsleep((caddr_t) &so->so_timeo, PSOCK, "portalcon", 5 * hz);
}
splx(s);
if (so->so_error) {
error = so->so_error;
goto bad;
}
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/*
* Set miscellaneous flags
*/
so->so_rcv.sb_timeo = 0;
so->so_snd.sb_timeo = 0;
so->so_rcv.sb_flags |= SB_NOINTR;
so->so_snd.sb_flags |= SB_NOINTR;
pcred.pcr_flag = ap->a_mode;
pcred.pcr_uid = ap->a_cred->cr_uid;
pcred.pcr_ngroups = ap->a_cred->cr_ngroups;
bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t));
aiov[0].iov_base = (caddr_t) &pcred;
aiov[0].iov_len = sizeof(pcred);
aiov[1].iov_base = pt->pt_arg;
aiov[1].iov_len = pt->pt_size;
auio.uio_iov = aiov;
auio.uio_iovcnt = 2;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_procp = p;
auio.uio_offset = 0;
auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len;
error = sosend(so, (struct sockaddr *) 0, &auio,
(struct mbuf *) 0, (struct mbuf *) 0, 0, p);
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if (error)
goto bad;
len = auio.uio_resid = sizeof(int);
do {
struct mbuf *m = 0;
int flags = MSG_WAITALL;
error = soreceive(so, (struct sockaddr **) 0, &auio,
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&m, &cm, &flags);
if (error)
goto bad;
/*
* Grab an error code from the mbuf.
*/
if (m) {
m = m_pullup(m, sizeof(int)); /* Needed? */
if (m) {
error = *(mtod(m, int *));
m_freem(m);
} else {
error = EINVAL;
}
} else {
if (cm == 0) {
error = ECONNRESET; /* XXX */
#ifdef notdef
break;
#endif
}
}
} while (cm == 0 && auio.uio_resid == len && !error);
if (cm == 0)
goto bad;
if (auio.uio_resid) {
error = 0;
#ifdef notdef
error = EMSGSIZE;
goto bad;
#endif
}
/*
* XXX: Break apart the control message, and retrieve the
* received file descriptor. Note that more than one descriptor
* may have been received, or that the rights chain may have more
* than a single mbuf in it. What to do?
*/
cmsg = mtod(cm, struct cmsghdr *);
newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int);
if (newfds == 0) {
error = ECONNREFUSED;
goto bad;
}
/*
* At this point the rights message consists of a control message
* header, followed by a data region containing a vector of
* integer file descriptors. The fds were allocated by the action
* of receiving the control message.
*/
ip = (int *) (cmsg + 1);
fd = *ip++;
if (newfds > 1) {
/*
* Close extra fds.
*/
int i;
printf("portal_open: %d extra fds\n", newfds - 1);
for (i = 1; i < newfds; i++) {
portal_closefd(p, *ip);
ip++;
}
}
/*
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* Check that the mode the file is being opened for is a subset
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* of the mode of the existing descriptor.
*/
fp = p->p_fd->fd_ofiles[fd];
if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) {
portal_closefd(p, fd);
error = EACCES;
goto bad;
}
/*
* Save the dup fd in the proc structure then return the
* special error code (ENXIO) which causes magic things to
* happen in vn_open. The whole concept is, well, hmmm.
*/
p->p_dupfd = fd;
error = ENXIO;
bad:;
/*
* And discard the control message.
*/
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if (cm) {
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m_freem(cm);
}
if (so) {
soshutdown(so, 2);
soclose(so);
}
return (error);
}
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static int
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portal_getattr(ap)
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
struct timeval tv;
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bzero(vap, sizeof(*vap));
vattr_null(vap);
vap->va_uid = 0;
vap->va_gid = 0;
vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
vap->va_size = DEV_BSIZE;
vap->va_blocksize = DEV_BSIZE;
microtime(&tv);
TIMEVAL_TO_TIMESPEC(&tv, &vap->va_atime);
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vap->va_mtime = vap->va_atime;
vap->va_ctime = vap->va_ctime;
vap->va_gen = 0;
vap->va_flags = 0;
vap->va_rdev = 0;
/* vap->va_qbytes = 0; */
vap->va_bytes = 0;
/* vap->va_qsize = 0; */
if (vp->v_flag & VROOT) {
vap->va_type = VDIR;
vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR|
S_IRGRP|S_IWGRP|S_IXGRP|
S_IROTH|S_IWOTH|S_IXOTH;
vap->va_nlink = 2;
vap->va_fileid = 2;
} else {
vap->va_type = VREG;
vap->va_mode = S_IRUSR|S_IWUSR|
S_IRGRP|S_IWGRP|
S_IROTH|S_IWOTH;
vap->va_nlink = 1;
vap->va_fileid = VTOPORTAL(vp)->pt_fileid;
}
return (0);
}
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static int
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portal_setattr(ap)
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
/*
* Can't mess with the root vnode
*/
if (ap->a_vp->v_flag & VROOT)
return (EACCES);
return (0);
}
/*
* Fake readdir, just return empty directory.
* It is hard to deal with '.' and '..' so don't bother.
*/
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static int
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portal_readdir(ap)
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_eofflag;
u_long *a_cookies;
int a_ncookies;
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} */ *ap;
{
/*
* We don't allow exporting portal mounts, and currently local
* requests do not need cookies.
*/
if (ap->a_ncookies)
panic("portal_readdir: not hungry");
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return (0);
}
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static int
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portal_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
struct proc *a_p;
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} */ *ap;
{
VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
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return (0);
}
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static int
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portal_reclaim(ap)
struct vop_reclaim_args /* {
struct vnode *a_vp;
} */ *ap;
{
struct portalnode *pt = VTOPORTAL(ap->a_vp);
if (pt->pt_arg) {
free((caddr_t) pt->pt_arg, M_TEMP);
pt->pt_arg = 0;
}
FREE(ap->a_vp->v_data, M_TEMP);
ap->a_vp->v_data = 0;
return (0);
}
/*
* Return POSIX pathconf information applicable to special devices.
*/
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static int
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portal_pathconf(ap)
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
int *a_retval;
} */ *ap;
{
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_MAX_CANON:
*ap->a_retval = MAX_CANON;
return (0);
case _PC_MAX_INPUT:
*ap->a_retval = MAX_INPUT;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_VDISABLE:
*ap->a_retval = _POSIX_VDISABLE;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Print out the contents of a Portal vnode.
*/
/* ARGSUSED */
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static int
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portal_print(ap)
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap;
{
printf("tag VT_PORTAL, portal vnode\n");
return (0);
}
/*void*/
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static int
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portal_vfree(ap)
struct vop_vfree_args /* {
struct vnode *a_pvp;
ino_t a_ino;
int a_mode;
} */ *ap;
{
return (0);
}
/*
* Portal vnode unsupported operation
*/
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static int
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portal_enotsupp()
{
return (EOPNOTSUPP);
}
/*
* Portal "should never get here" operation
*/
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static int
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portal_badop()
{
panic("portal: bad op");
/* NOTREACHED */
}
#define portal_create ((int (*) __P((struct vop_create_args *)))portal_enotsupp)
#define portal_mknod ((int (*) __P((struct vop_mknod_args *)))portal_enotsupp)
#define portal_close ((int (*) __P((struct vop_close_args *)))nullop)
#define portal_access ((int (*) __P((struct vop_access_args *)))nullop)
#define portal_read ((int (*) __P((struct vop_read_args *)))portal_enotsupp)
#define portal_write ((int (*) __P((struct vop_write_args *)))portal_enotsupp)
#define portal_ioctl ((int (*) __P((struct vop_ioctl_args *)))portal_enotsupp)
#define portal_mmap ((int (*) __P((struct vop_mmap_args *)))portal_enotsupp)
#define portal_poll vop_nopoll
#define portal_revoke vop_revoke
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#define portal_fsync ((int (*) __P((struct vop_fsync_args *)))nullop)
#define portal_seek ((int (*) __P((struct vop_seek_args *)))nullop)
#define portal_remove ((int (*) __P((struct vop_remove_args *)))portal_enotsupp)
#define portal_link ((int (*) __P((struct vop_link_args *)))portal_enotsupp)
#define portal_rename ((int (*) __P((struct vop_rename_args *)))portal_enotsupp)
#define portal_mkdir ((int (*) __P((struct vop_mkdir_args *)))portal_enotsupp)
#define portal_rmdir ((int (*) __P((struct vop_rmdir_args *)))portal_enotsupp)
#define portal_symlink \
((int (*) __P((struct vop_symlink_args *)))portal_enotsupp)
#define portal_readlink \
((int (*) __P((struct vop_readlink_args *)))portal_enotsupp)
#define portal_abortop ((int (*) __P((struct vop_abortop_args *)))nullop)
#define portal_lock ((int (*) __P((struct vop_lock_args *)))vop_nolock)
#define portal_unlock ((int (*) __P((struct vop_unlock_args *)))vop_nounlock)
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#define portal_bmap ((int (*) __P((struct vop_bmap_args *)))portal_badop)
#define portal_strategy \
((int (*) __P((struct vop_strategy_args *)))portal_badop)
#define portal_islocked \
((int (*) __P((struct vop_islocked_args *)))vop_noislocked)
#define fifo_islocked ((int(*) __P((struct vop_islocked_args *)))vop_noislocked)
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#define portal_advlock \
((int (*) __P((struct vop_advlock_args *)))portal_enotsupp)
#define portal_blkatoff \
((int (*) __P((struct vop_blkatoff_args *)))portal_enotsupp)
#define portal_valloc ((int(*) __P(( \
struct vnode *pvp, \
int mode, \
struct ucred *cred, \
struct vnode **vpp))) portal_enotsupp)
#define portal_truncate \
((int (*) __P((struct vop_truncate_args *)))portal_enotsupp)
#define portal_update ((int (*) __P((struct vop_update_args *)))portal_enotsupp)
#define portal_bwrite ((int (*) __P((struct vop_bwrite_args *)))portal_enotsupp)
vop_t **portal_vnodeop_p;
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static struct vnodeopv_entry_desc portal_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *) vn_default_error },
{ &vop_abortop_desc, (vop_t *) portal_abortop },
{ &vop_access_desc, (vop_t *) portal_access },
{ &vop_advlock_desc, (vop_t *) portal_advlock },
{ &vop_blkatoff_desc, (vop_t *) portal_blkatoff },
{ &vop_bmap_desc, (vop_t *) portal_bmap },
{ &vop_bwrite_desc, (vop_t *) portal_bwrite },
{ &vop_close_desc, (vop_t *) portal_close },
{ &vop_create_desc, (vop_t *) portal_create },
{ &vop_fsync_desc, (vop_t *) portal_fsync },
{ &vop_getattr_desc, (vop_t *) portal_getattr },
{ &vop_inactive_desc, (vop_t *) portal_inactive },
{ &vop_ioctl_desc, (vop_t *) portal_ioctl },
{ &vop_islocked_desc, (vop_t *) portal_islocked },
{ &vop_link_desc, (vop_t *) portal_link },
{ &vop_lock_desc, (vop_t *) portal_lock },
{ &vop_lookup_desc, (vop_t *) portal_lookup },
{ &vop_mkdir_desc, (vop_t *) portal_mkdir },
{ &vop_mknod_desc, (vop_t *) portal_mknod },
{ &vop_mmap_desc, (vop_t *) portal_mmap },
{ &vop_open_desc, (vop_t *) portal_open },
{ &vop_pathconf_desc, (vop_t *) portal_pathconf },
{ &vop_poll_desc, (vop_t *) portal_poll },
{ &vop_print_desc, (vop_t *) portal_print },
{ &vop_read_desc, (vop_t *) portal_read },
{ &vop_readdir_desc, (vop_t *) portal_readdir },
{ &vop_readlink_desc, (vop_t *) portal_readlink },
{ &vop_reclaim_desc, (vop_t *) portal_reclaim },
{ &vop_remove_desc, (vop_t *) portal_remove },
{ &vop_rename_desc, (vop_t *) portal_rename },
{ &vop_revoke_desc, (vop_t *) portal_revoke },
{ &vop_rmdir_desc, (vop_t *) portal_rmdir },
{ &vop_seek_desc, (vop_t *) portal_seek },
{ &vop_setattr_desc, (vop_t *) portal_setattr },
{ &vop_strategy_desc, (vop_t *) portal_strategy },
{ &vop_symlink_desc, (vop_t *) portal_symlink },
{ &vop_truncate_desc, (vop_t *) portal_truncate },
{ &vop_unlock_desc, (vop_t *) portal_unlock },
{ &vop_update_desc, (vop_t *) portal_update },
{ &vop_valloc_desc, (vop_t *) portal_valloc },
{ &vop_vfree_desc, (vop_t *) portal_vfree },
{ &vop_write_desc, (vop_t *) portal_write },
{ NULL, NULL }
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};
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static struct vnodeopv_desc portal_vnodeop_opv_desc =
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{ &portal_vnodeop_p, portal_vnodeop_entries };
VNODEOP_SET(portal_vnodeop_opv_desc);