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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 $
39 * $DragonFly: src/sys/vfs/portal/portal_vnops.c,v 1.10 2004/03/05 16:57:16 hsu Exp $
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/sysproto.h>
49 #include <sys/kernel.h>
52 #include <sys/filedesc.h>
53 #include <sys/vnode.h>
54 #include <sys/fcntl.h>
57 #include <sys/mount.h>
58 #include <sys/malloc.h>
59 #include <sys/namei.h>
61 #include <sys/resourcevar.h>
62 #include <sys/socket.h>
63 #include <sys/socketvar.h>
65 #include <sys/unpcb.h>
68 static int portal_fileid = PORTAL_ROOTFILEID+1;
70 static int portal_badop (void);
71 static void portal_closefd (struct thread *td, int fd);
72 static int portal_connect (struct socket *so, struct socket *so2);
73 static int portal_getattr (struct vop_getattr_args *ap);
74 static int portal_inactive (struct vop_inactive_args *ap);
75 static int portal_lookup (struct vop_lookup_args *ap);
76 static int portal_open (struct vop_open_args *ap);
77 static int portal_print (struct vop_print_args *ap);
78 static int portal_readdir (struct vop_readdir_args *ap);
79 static int portal_reclaim (struct vop_reclaim_args *ap);
80 static int portal_setattr (struct vop_setattr_args *ap);
83 portal_closefd(td, fd)
93 * We should never get an error, and there isn't anything
94 * we could do if we got one, so just print a message.
97 printf("portal_closefd: error = %d\n", error);
101 * vp is the current namei directory
102 * cnp is the name to locate in that directory...
106 struct vop_lookup_args /* {
107 struct vnode * a_dvp;
108 struct vnode ** a_vpp;
109 struct componentname * a_cnp;
112 struct componentname *cnp = ap->a_cnp;
113 struct vnode **vpp = ap->a_vpp;
114 struct vnode *dvp = ap->a_dvp;
115 char *pname = cnp->cn_nameptr;
116 struct portalnode *pt;
118 struct vnode *fvp = 0;
124 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)
127 if (cnp->cn_namelen == 1 && *pname == '.') {
135 * Do the MALLOC before the getnewvnode since doing so afterward
136 * might cause a bogus v_data pointer to get dereferenced
137 * elsewhere if MALLOC should block.
139 MALLOC(pt, struct portalnode *, sizeof(struct portalnode),
142 error = getnewvnode(VT_PORTAL, dvp->v_mount, portal_vnodeop_p, &fvp);
150 * Save all of the remaining pathname and
151 * advance the namei next pointer to the end
154 for (size = 0, path = pname; *path; path++)
156 cnp->cn_consume = size - cnp->cn_namelen;
158 pt->pt_arg = malloc(size+1, M_TEMP, M_WAITOK);
159 pt->pt_size = size+1;
160 bcopy(pname, pt->pt_arg, pt->pt_size);
161 pt->pt_fileid = portal_fileid++;
174 portal_connect(so, so2)
178 /* from unp_connect, bypassing the namei stuff... */
184 return (ECONNREFUSED);
186 if (so->so_type != so2->so_type)
189 if ((so2->so_options & SO_ACCEPTCONN) == 0)
190 return (ECONNREFUSED);
192 if ((so3 = sonewconn(so2, 0)) == 0)
193 return (ECONNREFUSED);
195 unp2 = sotounpcb(so2);
196 unp3 = sotounpcb(so3);
198 unp3->unp_addr = (struct sockaddr_un *)
199 dup_sockaddr((struct sockaddr *)unp2->unp_addr, 0);
202 return (unp_connect2(so, so2));
207 struct vop_open_args /* {
210 struct ucred *a_cred;
214 struct socket *so = 0;
215 struct portalnode *pt;
216 struct thread *td = ap->a_td;
217 struct vnode *vp = ap->a_vp;
220 struct iovec aiov[2];
223 struct cmsghdr *cmsg;
229 struct portalmount *fmp;
231 struct portal_cred pcred;
234 * Nothing to do when opening the root node.
236 if (vp->v_flag & VROOT)
240 * Can't be opened unless the caller is set up
241 * to deal with the side effects. Check for this
242 * by testing whether the p_dupfd has been set.
244 KKASSERT(td->td_proc);
245 if (td->td_proc->p_dupfd >= 0)
249 fmp = VFSTOPORTAL(vp->v_mount);
252 * Create a new socket.
254 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, ap->a_td);
259 * Reserve some buffer space
261 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */
262 error = soreserve(so, res, res, &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
267 * Kick off connection
269 error = portal_connect(so, (struct socket *)fmp->pm_server->f_data);
274 * Wait for connection to complete
277 * XXX: Since the mount point is holding a reference on the
278 * underlying server socket, it is not easy to find out whether
279 * the server process is still running. To handle this problem
280 * we loop waiting for the new socket to be connected (something
281 * which will only happen if the server is still running) or for
282 * the reference count on the server socket to drop to 1, which
283 * will happen if the server dies. Sleep for 5 second intervals
284 * and keep polling the reference count. XXX.
287 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
288 if (fmp->pm_server->f_count == 1) {
289 error = ECONNREFUSED;
293 (void) tsleep((caddr_t) &so->so_timeo, 0, "portalcon", 5 * hz);
298 error = so->so_error;
303 * Set miscellaneous flags
305 so->so_rcv.sb_timeo = 0;
306 so->so_snd.sb_timeo = 0;
307 so->so_rcv.sb_flags |= SB_NOINTR;
308 so->so_snd.sb_flags |= SB_NOINTR;
311 pcred.pcr_flag = ap->a_mode;
312 pcred.pcr_uid = ap->a_cred->cr_uid;
313 pcred.pcr_ngroups = ap->a_cred->cr_ngroups;
314 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t));
315 aiov[0].iov_base = (caddr_t) &pcred;
316 aiov[0].iov_len = sizeof(pcred);
317 aiov[1].iov_base = pt->pt_arg;
318 aiov[1].iov_len = pt->pt_size;
321 auio.uio_rw = UIO_WRITE;
322 auio.uio_segflg = UIO_SYSSPACE;
325 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len;
327 error = sosend(so, (struct sockaddr *) 0, &auio,
328 (struct mbuf *) 0, (struct mbuf *) 0, 0, td);
332 len = auio.uio_resid = sizeof(int);
335 int flags = MSG_WAITALL;
336 error = soreceive(so, (struct sockaddr **) 0, &auio,
342 * Grab an error code from the mbuf.
345 m = m_pullup(m, sizeof(int)); /* Needed? */
347 error = *(mtod(m, int *));
354 error = ECONNRESET; /* XXX */
360 } while (cm == 0 && auio.uio_resid == len && !error);
365 if (auio.uio_resid) {
374 * XXX: Break apart the control message, and retrieve the
375 * received file descriptor. Note that more than one descriptor
376 * may have been received, or that the rights chain may have more
377 * than a single mbuf in it. What to do?
379 cmsg = mtod(cm, struct cmsghdr *);
380 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int);
382 error = ECONNREFUSED;
386 * At this point the rights message consists of a control message
387 * header, followed by a data region containing a vector of
388 * integer file descriptors. The fds were allocated by the action
389 * of receiving the control message.
391 ip = (int *) (cmsg + 1);
398 printf("portal_open: %d extra fds\n", newfds - 1);
399 for (i = 1; i < newfds; i++) {
400 portal_closefd(td, *ip);
406 * Check that the mode the file is being opened for is a subset
407 * of the mode of the existing descriptor.
409 KKASSERT(td->td_proc);
410 fp = td->td_proc->p_fd->fd_ofiles[fd];
411 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) {
412 portal_closefd(td, fd);
418 * Save the dup fd in the proc structure then return the
419 * special error code (ENXIO) which causes magic things to
420 * happen in vn_open. The whole concept is, well, hmmm.
422 td->td_proc->p_dupfd = fd;
427 * And discard the control message.
442 struct vop_getattr_args /* {
445 struct ucred *a_cred;
449 struct vnode *vp = ap->a_vp;
450 struct vattr *vap = ap->a_vap;
452 bzero(vap, sizeof(*vap));
456 vap->va_size = DEV_BSIZE;
457 vap->va_blocksize = DEV_BSIZE;
458 nanotime(&vap->va_atime);
459 vap->va_mtime = vap->va_atime;
460 vap->va_ctime = vap->va_mtime;
464 /* vap->va_qbytes = 0; */
466 /* vap->va_qsize = 0; */
467 if (vp->v_flag & VROOT) {
469 vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR|
470 S_IRGRP|S_IWGRP|S_IXGRP|
471 S_IROTH|S_IWOTH|S_IXOTH;
476 vap->va_mode = S_IRUSR|S_IWUSR|
480 vap->va_fileid = VTOPORTAL(vp)->pt_fileid;
487 struct vop_setattr_args /* {
490 struct ucred *a_cred;
496 * Can't mess with the root vnode
498 if (ap->a_vp->v_flag & VROOT)
501 if (ap->a_vap->va_flags != VNOVAL)
508 * Fake readdir, just return empty directory.
509 * It is hard to deal with '.' and '..' so don't bother.
513 struct vop_readdir_args /* {
516 struct ucred *a_cred;
524 * We don't allow exporting portal mounts, and currently local
525 * requests do not need cookies.
528 panic("portal_readdir: not hungry");
535 struct vop_inactive_args /* {
541 VOP_UNLOCK(ap->a_vp, NULL, 0, ap->a_td);
547 struct vop_reclaim_args /* {
551 struct portalnode *pt = VTOPORTAL(ap->a_vp);
554 free((caddr_t) pt->pt_arg, M_TEMP);
557 FREE(ap->a_vp->v_data, M_TEMP);
558 ap->a_vp->v_data = 0;
565 * Print out the contents of a Portal vnode.
570 struct vop_print_args /* {
575 printf("tag VT_PORTAL, portal vnode\n");
581 * Portal "should never get here" operation
587 panic("portal: bad op");
591 vop_t **portal_vnodeop_p;
592 static struct vnodeopv_entry_desc portal_vnodeop_entries[] = {
593 { &vop_default_desc, (vop_t *) vop_defaultop },
594 { &vop_access_desc, (vop_t *) vop_null },
595 { &vop_bmap_desc, (vop_t *) portal_badop },
596 { &vop_getattr_desc, (vop_t *) portal_getattr },
597 { &vop_inactive_desc, (vop_t *) portal_inactive },
598 { &vop_lookup_desc, (vop_t *) portal_lookup },
599 { &vop_open_desc, (vop_t *) portal_open },
600 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
601 { &vop_print_desc, (vop_t *) portal_print },
602 { &vop_readdir_desc, (vop_t *) portal_readdir },
603 { &vop_reclaim_desc, (vop_t *) portal_reclaim },
604 { &vop_setattr_desc, (vop_t *) portal_setattr },
607 static struct vnodeopv_desc portal_vnodeop_opv_desc =
608 { &portal_vnodeop_p, portal_vnodeop_entries };
610 VNODEOP_SET(portal_vnodeop_opv_desc);