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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 portalnode *pt;
108 struct vnode *fvp = 0;
114 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
117 if (cnp->cn_namelen == 1 && *pname == '.') {
122 KASSERT((cnp->cn_flags & ISDOTDOT) == 0,
123 ("portal_lookup: Can not handle dotdot lookups."));
126 * Do the MALLOC before the getnewvnode since doing so afterward
127 * might cause a bogus v_data pointer to get dereferenced
128 * elsewhere if MALLOC should block.
130 pt = malloc(sizeof(struct portalnode),
133 error = getnewvnode("portal", dvp->v_mount, &portal_vnodeops, &fvp);
141 * Save all of the remaining pathname and
142 * advance the namei next pointer to the end
145 for (size = 0, path = pname; *path; path++)
147 cnp->cn_consume = size - cnp->cn_namelen;
149 pt->pt_arg = malloc(size+1, M_TEMP, M_WAITOK);
150 pt->pt_size = size+1;
151 bcopy(pname, pt->pt_arg, pt->pt_size);
152 pt->pt_fileid = portal_fileid++;
155 vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY);
156 error = insmntque(fvp, dvp->v_mount);
170 portal_connect(so, so2)
174 /* from unp_connect, bypassing the namei stuff... */
180 return (ECONNREFUSED);
182 if (so->so_type != so2->so_type)
185 if ((so2->so_options & SO_ACCEPTCONN) == 0)
186 return (ECONNREFUSED);
188 if ((so3 = sonewconn(so2, 0)) == 0)
189 return (ECONNREFUSED);
191 unp2 = sotounpcb(so2);
192 unp3 = sotounpcb(so3);
194 unp3->unp_addr = (struct sockaddr_un *)
195 sodupsockaddr((struct sockaddr *)unp2->unp_addr,
199 return (soconnect2(so, so2));
204 struct vop_open_args /* {
207 struct ucred *a_cred;
211 struct socket *so = 0;
212 struct portalnode *pt;
213 struct thread *td = ap->a_td;
214 struct vnode *vp = ap->a_vp;
216 struct iovec aiov[2];
219 struct cmsghdr *cmsg;
225 struct portalmount *fmp;
227 struct portal_cred pcred;
230 * Nothing to do when opening the root node.
232 if (vp->v_vflag & VV_ROOT)
236 * Can't be opened unless the caller is set up
237 * to deal with the side effects. Check for this
238 * by testing whether td_dupfd has been set.
240 if (td->td_dupfd >= 0)
244 fmp = VFSTOPORTAL(vp->v_mount);
247 * Create a new socket.
249 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, ap->a_td->td_ucred,
255 * Reserve some buffer space
257 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */
258 error = soreserve(so, res, res);
263 * Kick off connection
265 error = portal_connect(so, fmp->pm_server->f_data);
270 * Wait for connection to complete
273 * XXX: Since the mount point is holding a reference on the
274 * underlying server socket, it is not easy to find out whether
275 * the server process is still running. To handle this problem
276 * we loop waiting for the new socket to be connected (something
277 * which will only happen if the server is still running) or for
278 * the reference count on the server socket to drop to 1, which
279 * will happen if the server dies. Sleep for 5 second intervals
280 * and keep polling the reference count. XXX.
283 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
284 if (fmp->pm_server->f_count == 1) {
286 error = ECONNREFUSED;
289 (void) msleep((caddr_t) &so->so_timeo, SOCK_MTX(so), PSOCK,
290 "portalcon", 5 * hz);
295 error = so->so_error;
300 * Set miscellaneous flags
302 SOCKBUF_LOCK(&so->so_rcv);
303 so->so_rcv.sb_timeo = 0;
304 so->so_rcv.sb_flags |= SB_NOINTR;
305 SOCKBUF_UNLOCK(&so->so_rcv);
306 SOCKBUF_LOCK(&so->so_snd);
307 so->so_snd.sb_timeo = 0;
308 so->so_snd.sb_flags |= SB_NOINTR;
309 SOCKBUF_UNLOCK(&so->so_snd);
312 pcred.pcr_flag = ap->a_mode;
313 pcred.pcr_uid = ap->a_cred->cr_uid;
314 pcred.pcr_ngroups = MIN(ap->a_cred->cr_ngroups, XU_NGROUPS);
315 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups,
316 pcred.pcr_ngroups * sizeof(gid_t));
317 aiov[0].iov_base = (caddr_t) &pcred;
318 aiov[0].iov_len = sizeof(pcred);
319 aiov[1].iov_base = pt->pt_arg;
320 aiov[1].iov_len = pt->pt_size;
323 auio.uio_rw = UIO_WRITE;
324 auio.uio_segflg = UIO_SYSSPACE;
327 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len;
329 error = sosend(so, (struct sockaddr *) 0, &auio,
330 (struct mbuf *) 0, (struct mbuf *) 0, 0 , td);
334 len = auio.uio_resid = sizeof(int);
337 int flags = MSG_WAITALL;
338 error = soreceive(so, (struct sockaddr **) 0, &auio,
344 * Grab an error code from the mbuf.
347 m = m_pullup(m, sizeof(int)); /* Needed? */
349 error = *(mtod(m, int *));
356 error = ECONNRESET; /* XXX */
362 } while (cm == 0 && auio.uio_resid == len && !error);
367 if (auio.uio_resid) {
376 * XXX: Break apart the control message, and retrieve the
377 * received file descriptor. Note that more than one descriptor
378 * may have been received, or that the rights chain may have more
379 * than a single mbuf in it. What to do?
381 cmsg = mtod(cm, struct cmsghdr *);
382 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int);
384 error = ECONNREFUSED;
388 * At this point the rights message consists of a control message
389 * header, followed by a data region containing a vector of
390 * integer file descriptors. The fds were allocated by the action
391 * of receiving the control message.
393 ip = (int *) (cmsg + 1);
400 printf("portal_open: %d extra fds\n", newfds - 1);
401 for (i = 1; i < newfds; i++) {
402 portal_closefd(td, *ip);
408 * Check that the mode the file is being opened for is a subset
409 * of the mode of the existing descriptor.
411 if ((error = fget(td, fd, &fp)) != 0)
413 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) {
415 portal_closefd(td, fd);
422 * Save the dup fd in the proc structure then return the
423 * special error code (ENXIO) which causes magic things to
424 * happen in vn_open. The whole concept is, well, hmmm.
431 * And discard the control message.
446 struct vop_getattr_args /* {
449 struct ucred *a_cred;
452 struct vnode *vp = ap->a_vp;
453 struct vattr *vap = ap->a_vap;
457 vap->va_size = DEV_BSIZE;
458 vap->va_blocksize = DEV_BSIZE;
459 nanotime(&vap->va_atime);
460 vap->va_mtime = vap->va_atime;
461 vap->va_ctime = vap->va_mtime;
464 vap->va_rdev = NODEV;
465 /* vap->va_qbytes = 0; */
468 /* vap->va_qsize = 0; */
469 if (vp->v_vflag & VV_ROOT) {
471 vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR|
472 S_IRGRP|S_IWGRP|S_IXGRP|
473 S_IROTH|S_IWOTH|S_IXOTH;
478 vap->va_mode = S_IRUSR|S_IWUSR|
482 vap->va_fileid = VTOPORTAL(vp)->pt_fileid;
489 struct vop_setattr_args /* {
492 struct ucred *a_cred;
497 * Can't mess with the root vnode
499 if (ap->a_vp->v_vflag & VV_ROOT)
502 if (ap->a_vap->va_flags != VNOVAL)
509 * Fake readdir, just return empty directory.
510 * It is hard to deal with '.' and '..' so don't bother.
514 struct vop_readdir_args /* {
517 struct ucred *a_cred;
525 * We don't allow exporting portal mounts, and currently local
526 * requests do not need cookies.
529 panic("portal_readdir: not hungry");
536 struct vop_reclaim_args /* {
540 struct portalnode *pt = VTOPORTAL(ap->a_vp);
543 free((caddr_t) pt->pt_arg, M_TEMP);
546 free(ap->a_vp->v_data, M_TEMP);
547 ap->a_vp->v_data = 0;
552 struct vop_vector portal_vnodeops = {
553 .vop_default = &default_vnodeops,
555 .vop_access = VOP_NULL,
556 .vop_getattr = portal_getattr,
557 .vop_lookup = portal_lookup,
558 .vop_open = portal_open,
559 .vop_pathconf = vop_stdpathconf,
560 .vop_readdir = portal_readdir,
561 .vop_reclaim = portal_reclaim,
562 .vop_setattr = portal_setattr,