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36 * @(#)portal_vnops.c 8.14 (Berkeley) 5/21/95
38 * $FreeBSD: src/sys/miscfs/portal/portal_vnops.c,v 1.38 1999/12/21 06:29:00 chris Exp $
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/sysproto.h>
48 #include <sys/kernel.h>
51 #include <sys/filedesc.h>
52 #include <sys/vnode.h>
53 #include <sys/fcntl.h>
56 #include <sys/mount.h>
57 #include <sys/malloc.h>
58 #include <sys/namei.h>
60 #include <sys/socket.h>
61 #include <sys/socketvar.h>
63 #include <sys/unpcb.h>
64 #include <miscfs/portal/portal.h>
66 static int portal_fileid = PORTAL_ROOTFILEID+1;
68 static int portal_badop __P((void));
69 static void portal_closefd __P((struct proc *p, int fd));
70 static int portal_connect __P((struct socket *so, struct socket *so2));
71 static int portal_getattr __P((struct vop_getattr_args *ap));
72 static int portal_inactive __P((struct vop_inactive_args *ap));
73 static int portal_lookup __P((struct vop_lookup_args *ap));
74 static int portal_open __P((struct vop_open_args *ap));
75 static int portal_print __P((struct vop_print_args *ap));
76 static int portal_readdir __P((struct vop_readdir_args *ap));
77 static int portal_reclaim __P((struct vop_reclaim_args *ap));
78 static int portal_setattr __P((struct vop_setattr_args *ap));
89 error = close(p, &ua);
91 * We should never get an error, and there isn't anything
92 * we could do if we got one, so just print a message.
95 printf("portal_closefd: error = %d\n", error);
99 * vp is the current namei directory
100 * cnp is the name to locate in that directory...
104 struct vop_lookup_args /* {
105 struct vnode * a_dvp;
106 struct vnode ** a_vpp;
107 struct componentname * a_cnp;
110 struct componentname *cnp = ap->a_cnp;
111 struct vnode **vpp = ap->a_vpp;
112 struct vnode *dvp = ap->a_dvp;
113 char *pname = cnp->cn_nameptr;
114 struct portalnode *pt;
116 struct vnode *fvp = 0;
122 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
125 if (cnp->cn_namelen == 1 && *pname == '.') {
133 * Do the MALLOC before the getnewvnode since doing so afterward
134 * might cause a bogus v_data pointer to get dereferenced
135 * elsewhere if MALLOC should block.
137 MALLOC(pt, struct portalnode *, sizeof(struct portalnode),
140 error = getnewvnode(VT_PORTAL, dvp->v_mount, portal_vnodeop_p, &fvp);
148 * Save all of the remaining pathname and
149 * advance the namei next pointer to the end
152 for (size = 0, path = pname; *path; path++)
154 cnp->cn_consume = size - cnp->cn_namelen;
156 pt->pt_arg = malloc(size+1, M_TEMP, M_WAITOK);
157 pt->pt_size = size+1;
158 bcopy(pname, pt->pt_arg, pt->pt_size);
159 pt->pt_fileid = portal_fileid++;
172 portal_connect(so, so2)
176 /* from unp_connect, bypassing the namei stuff... */
182 return (ECONNREFUSED);
184 if (so->so_type != so2->so_type)
187 if ((so2->so_options & SO_ACCEPTCONN) == 0)
188 return (ECONNREFUSED);
190 if ((so3 = sonewconn(so2, 0)) == 0)
191 return (ECONNREFUSED);
193 unp2 = sotounpcb(so2);
194 unp3 = sotounpcb(so3);
196 unp3->unp_addr = (struct sockaddr_un *)
197 dup_sockaddr((struct sockaddr *)unp2->unp_addr, 0);
200 return (unp_connect2(so, so2));
205 struct vop_open_args /* {
208 struct ucred *a_cred;
212 struct socket *so = 0;
213 struct portalnode *pt;
214 struct proc *p = ap->a_p;
215 struct vnode *vp = ap->a_vp;
218 struct iovec aiov[2];
221 struct cmsghdr *cmsg;
227 struct portalmount *fmp;
229 struct portal_cred pcred;
232 * Nothing to do when opening the root node.
234 if (vp->v_flag & VROOT)
238 * Can't be opened unless the caller is set up
239 * to deal with the side effects. Check for this
240 * by testing whether the p_dupfd has been set.
246 fmp = VFSTOPORTAL(vp->v_mount);
249 * Create a new socket.
251 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, ap->a_p);
256 * Reserve some buffer space
258 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */
259 error = soreserve(so, res, res);
264 * Kick off connection
266 error = portal_connect(so, (struct socket *)fmp->pm_server->f_data);
271 * Wait for connection to complete
274 * XXX: Since the mount point is holding a reference on the
275 * underlying server socket, it is not easy to find out whether
276 * the server process is still running. To handle this problem
277 * we loop waiting for the new socket to be connected (something
278 * which will only happen if the server is still running) or for
279 * the reference count on the server socket to drop to 1, which
280 * will happen if the server dies. Sleep for 5 second intervals
281 * and keep polling the reference count. XXX.
284 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
285 if (fmp->pm_server->f_count == 1) {
286 error = ECONNREFUSED;
290 (void) tsleep((caddr_t) &so->so_timeo, PSOCK, "portalcon", 5 * hz);
295 error = so->so_error;
300 * Set miscellaneous flags
302 so->so_rcv.sb_timeo = 0;
303 so->so_snd.sb_timeo = 0;
304 so->so_rcv.sb_flags |= SB_NOINTR;
305 so->so_snd.sb_flags |= SB_NOINTR;
308 pcred.pcr_flag = ap->a_mode;
309 pcred.pcr_uid = ap->a_cred->cr_uid;
310 pcred.pcr_ngroups = ap->a_cred->cr_ngroups;
311 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t));
312 aiov[0].iov_base = (caddr_t) &pcred;
313 aiov[0].iov_len = sizeof(pcred);
314 aiov[1].iov_base = pt->pt_arg;
315 aiov[1].iov_len = pt->pt_size;
318 auio.uio_rw = UIO_WRITE;
319 auio.uio_segflg = UIO_SYSSPACE;
322 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len;
324 error = sosend(so, (struct sockaddr *) 0, &auio,
325 (struct mbuf *) 0, (struct mbuf *) 0, 0, p);
329 len = auio.uio_resid = sizeof(int);
332 int flags = MSG_WAITALL;
333 error = soreceive(so, (struct sockaddr **) 0, &auio,
339 * Grab an error code from the mbuf.
342 m = m_pullup(m, sizeof(int)); /* Needed? */
344 error = *(mtod(m, int *));
351 error = ECONNRESET; /* XXX */
357 } while (cm == 0 && auio.uio_resid == len && !error);
362 if (auio.uio_resid) {
371 * XXX: Break apart the control message, and retrieve the
372 * received file descriptor. Note that more than one descriptor
373 * may have been received, or that the rights chain may have more
374 * than a single mbuf in it. What to do?
376 cmsg = mtod(cm, struct cmsghdr *);
377 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int);
379 error = ECONNREFUSED;
383 * At this point the rights message consists of a control message
384 * header, followed by a data region containing a vector of
385 * integer file descriptors. The fds were allocated by the action
386 * of receiving the control message.
388 ip = (int *) (cmsg + 1);
395 printf("portal_open: %d extra fds\n", newfds - 1);
396 for (i = 1; i < newfds; i++) {
397 portal_closefd(p, *ip);
403 * Check that the mode the file is being opened for is a subset
404 * of the mode of the existing descriptor.
406 fp = p->p_fd->fd_ofiles[fd];
407 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) {
408 portal_closefd(p, fd);
414 * Save the dup fd in the proc structure then return the
415 * special error code (ENXIO) which causes magic things to
416 * happen in vn_open. The whole concept is, well, hmmm.
423 * And discard the control message.
438 struct vop_getattr_args /* {
441 struct ucred *a_cred;
445 struct vnode *vp = ap->a_vp;
446 struct vattr *vap = ap->a_vap;
448 bzero(vap, sizeof(*vap));
452 vap->va_size = DEV_BSIZE;
453 vap->va_blocksize = DEV_BSIZE;
454 nanotime(&vap->va_atime);
455 vap->va_mtime = vap->va_atime;
456 vap->va_ctime = vap->va_mtime;
460 /* vap->va_qbytes = 0; */
462 /* vap->va_qsize = 0; */
463 if (vp->v_flag & VROOT) {
465 vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR|
466 S_IRGRP|S_IWGRP|S_IXGRP|
467 S_IROTH|S_IWOTH|S_IXOTH;
472 vap->va_mode = S_IRUSR|S_IWUSR|
476 vap->va_fileid = VTOPORTAL(vp)->pt_fileid;
483 struct vop_setattr_args /* {
486 struct ucred *a_cred;
492 * Can't mess with the root vnode
494 if (ap->a_vp->v_flag & VROOT)
497 if (ap->a_vap->va_flags != VNOVAL)
504 * Fake readdir, just return empty directory.
505 * It is hard to deal with '.' and '..' so don't bother.
509 struct vop_readdir_args /* {
512 struct ucred *a_cred;
520 * We don't allow exporting portal mounts, and currently local
521 * requests do not need cookies.
524 panic("portal_readdir: not hungry");
531 struct vop_inactive_args /* {
537 VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
543 struct vop_reclaim_args /* {
547 struct portalnode *pt = VTOPORTAL(ap->a_vp);
550 free((caddr_t) pt->pt_arg, M_TEMP);
553 FREE(ap->a_vp->v_data, M_TEMP);
554 ap->a_vp->v_data = 0;
561 * Print out the contents of a Portal vnode.
566 struct vop_print_args /* {
571 printf("tag VT_PORTAL, portal vnode\n");
577 * Portal "should never get here" operation
583 panic("portal: bad op");
587 vop_t **portal_vnodeop_p;
588 static struct vnodeopv_entry_desc portal_vnodeop_entries[] = {
589 { &vop_default_desc, (vop_t *) vop_defaultop },
590 { &vop_access_desc, (vop_t *) vop_null },
591 { &vop_bmap_desc, (vop_t *) portal_badop },
592 { &vop_getattr_desc, (vop_t *) portal_getattr },
593 { &vop_inactive_desc, (vop_t *) portal_inactive },
594 { &vop_lookup_desc, (vop_t *) portal_lookup },
595 { &vop_open_desc, (vop_t *) portal_open },
596 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
597 { &vop_print_desc, (vop_t *) portal_print },
598 { &vop_readdir_desc, (vop_t *) portal_readdir },
599 { &vop_reclaim_desc, (vop_t *) portal_reclaim },
600 { &vop_setattr_desc, (vop_t *) portal_setattr },
603 static struct vnodeopv_desc portal_vnodeop_opv_desc =
604 { &portal_vnodeop_p, portal_vnodeop_entries };
606 VNODEOP_SET(portal_vnodeop_opv_desc);