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32 * @(#)portal_vnops.c 8.14 (Berkeley) 5/21/95
41 #include <sys/param.h>
42 #include <sys/fcntl.h>
44 #include <sys/kernel.h>
46 #include <sys/malloc.h>
48 #include <sys/mount.h>
49 #include <sys/mutex.h>
50 #include <sys/namei.h>
52 #include <sys/socket.h>
53 #include <sys/socketvar.h>
55 #include <sys/syscallsubr.h>
56 #include <sys/systm.h>
58 #include <sys/unpcb.h>
59 #include <sys/vnode.h>
61 #include <fs/portalfs/portal.h>
63 static int portal_fileid = PORTAL_ROOTFILEID+1;
65 static void portal_closefd(struct thread *td, int fd);
66 static int portal_connect(struct socket *so, struct socket *so2);
67 static vop_getattr_t portal_getattr;
68 static vop_lookup_t portal_lookup;
69 static vop_open_t portal_open;
70 static vop_readdir_t portal_readdir;
71 static vop_reclaim_t portal_reclaim;
72 static vop_setattr_t portal_setattr;
75 portal_closefd(td, fd)
81 error = kern_close(td, fd);
83 * We should never get an error, and there isn't anything
84 * we could do if we got one, so just print a message.
87 printf("portal_closefd: error = %d\n", error);
91 * vp is the current namei directory
92 * cnp is the name to locate in that directory...
96 struct vop_lookup_args /* {
98 struct vnode ** a_vpp;
99 struct componentname * a_cnp;
102 struct componentname *cnp = ap->a_cnp;
103 struct vnode **vpp = ap->a_vpp;
104 struct vnode *dvp = ap->a_dvp;
105 char *pname = cnp->cn_nameptr;
106 struct thread *td = cnp->cn_thread;
107 struct portalnode *pt;
109 struct vnode *fvp = 0;
115 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
118 if (cnp->cn_namelen == 1 && *pname == '.') {
123 KASSERT((cnp->cn_flags & ISDOTDOT) == 0,
124 ("portal_lookup: Can not handle dotdot lookups."));
127 * Do the MALLOC before the getnewvnode since doing so afterward
128 * might cause a bogus v_data pointer to get dereferenced
129 * elsewhere if MALLOC should block.
131 MALLOC(pt, struct portalnode *, sizeof(struct portalnode),
134 error = getnewvnode("portal", dvp->v_mount, &portal_vnodeops, &fvp);
142 * Save all of the remaining pathname and
143 * advance the namei next pointer to the end
146 for (size = 0, path = pname; *path; path++)
148 cnp->cn_consume = size - cnp->cn_namelen;
150 pt->pt_arg = malloc(size+1, M_TEMP, M_WAITOK);
151 pt->pt_size = size+1;
152 bcopy(pname, pt->pt_arg, pt->pt_size);
153 pt->pt_fileid = portal_fileid++;
156 vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, td);
166 portal_connect(so, so2)
170 /* from unp_connect, bypassing the namei stuff... */
176 return (ECONNREFUSED);
178 if (so->so_type != so2->so_type)
181 if ((so2->so_options & SO_ACCEPTCONN) == 0)
182 return (ECONNREFUSED);
184 if ((so3 = sonewconn(so2, 0)) == 0)
185 return (ECONNREFUSED);
187 unp2 = sotounpcb(so2);
188 unp3 = sotounpcb(so3);
190 unp3->unp_addr = (struct sockaddr_un *)
191 sodupsockaddr((struct sockaddr *)unp2->unp_addr,
195 return (uipc_connect2(so, so2));
200 struct vop_open_args /* {
203 struct ucred *a_cred;
207 struct socket *so = 0;
208 struct portalnode *pt;
209 struct thread *td = ap->a_td;
210 struct vnode *vp = ap->a_vp;
212 struct iovec aiov[2];
215 struct cmsghdr *cmsg;
221 struct portalmount *fmp;
223 struct portal_cred pcred;
226 * Nothing to do when opening the root node.
228 if (vp->v_vflag & VV_ROOT)
232 * Can't be opened unless the caller is set up
233 * to deal with the side effects. Check for this
234 * by testing whether td_dupfd has been set.
236 if (td->td_dupfd >= 0)
240 fmp = VFSTOPORTAL(vp->v_mount);
243 * Create a new socket.
245 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, ap->a_td->td_ucred,
251 * Reserve some buffer space
253 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */
254 error = soreserve(so, res, res);
259 * Kick off connection
261 error = portal_connect(so, fmp->pm_server->f_data);
266 * Wait for connection to complete
269 * XXX: Since the mount point is holding a reference on the
270 * underlying server socket, it is not easy to find out whether
271 * the server process is still running. To handle this problem
272 * we loop waiting for the new socket to be connected (something
273 * which will only happen if the server is still running) or for
274 * the reference count on the server socket to drop to 1, which
275 * will happen if the server dies. Sleep for 5 second intervals
276 * and keep polling the reference count. XXX.
278 /* XXXRW: Locking? */
280 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
281 if (fmp->pm_server->f_count == 1) {
283 error = ECONNREFUSED;
286 (void) msleep((caddr_t) &so->so_timeo, SOCK_MTX(so), PSOCK,
287 "portalcon", 5 * hz);
292 error = so->so_error;
297 * Set miscellaneous flags
299 SOCKBUF_LOCK(&so->so_rcv);
300 so->so_rcv.sb_timeo = 0;
301 so->so_rcv.sb_flags |= SB_NOINTR;
302 SOCKBUF_UNLOCK(&so->so_rcv);
303 SOCKBUF_LOCK(&so->so_snd);
304 so->so_snd.sb_timeo = 0;
305 so->so_snd.sb_flags |= SB_NOINTR;
306 SOCKBUF_UNLOCK(&so->so_snd);
309 pcred.pcr_flag = ap->a_mode;
310 pcred.pcr_uid = ap->a_cred->cr_uid;
311 pcred.pcr_ngroups = ap->a_cred->cr_ngroups;
312 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t));
313 aiov[0].iov_base = (caddr_t) &pcred;
314 aiov[0].iov_len = sizeof(pcred);
315 aiov[1].iov_base = pt->pt_arg;
316 aiov[1].iov_len = pt->pt_size;
319 auio.uio_rw = UIO_WRITE;
320 auio.uio_segflg = UIO_SYSSPACE;
323 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len;
325 error = sosend(so, (struct sockaddr *) 0, &auio,
326 (struct mbuf *) 0, (struct mbuf *) 0, 0 , td);
330 len = auio.uio_resid = sizeof(int);
333 int flags = MSG_WAITALL;
334 error = soreceive(so, (struct sockaddr **) 0, &auio,
340 * Grab an error code from the mbuf.
343 m = m_pullup(m, sizeof(int)); /* Needed? */
345 error = *(mtod(m, int *));
352 error = ECONNRESET; /* XXX */
358 } while (cm == 0 && auio.uio_resid == len && !error);
363 if (auio.uio_resid) {
372 * XXX: Break apart the control message, and retrieve the
373 * received file descriptor. Note that more than one descriptor
374 * may have been received, or that the rights chain may have more
375 * than a single mbuf in it. What to do?
377 cmsg = mtod(cm, struct cmsghdr *);
378 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int);
380 error = ECONNREFUSED;
384 * At this point the rights message consists of a control message
385 * header, followed by a data region containing a vector of
386 * integer file descriptors. The fds were allocated by the action
387 * of receiving the control message.
389 ip = (int *) (cmsg + 1);
396 printf("portal_open: %d extra fds\n", newfds - 1);
397 for (i = 1; i < newfds; i++) {
398 portal_closefd(td, *ip);
404 * Check that the mode the file is being opened for is a subset
405 * of the mode of the existing descriptor.
407 if ((error = fget(td, fd, &fp)) != 0)
409 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) {
411 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.
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_vflag & VV_ROOT) {
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_vflag & VV_ROOT)
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_reclaim_args /* {
539 struct portalnode *pt = VTOPORTAL(ap->a_vp);
542 free((caddr_t) pt->pt_arg, M_TEMP);
545 FREE(ap->a_vp->v_data, M_TEMP);
546 ap->a_vp->v_data = 0;
551 struct vop_vector portal_vnodeops = {
552 .vop_default = &default_vnodeops,
554 .vop_access = VOP_NULL,
555 .vop_getattr = portal_getattr,
556 .vop_lookup = portal_lookup,
557 .vop_open = portal_open,
558 .vop_pathconf = vop_stdpathconf,
559 .vop_readdir = portal_readdir,
560 .vop_reclaim = portal_reclaim,
561 .vop_setattr = portal_setattr,