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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 1.16 2004/08/28 19:02:25 dillon 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(struct thread *td, int fd)
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...
102 * portal_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
103 * struct componentname *a_cnp)
106 portal_lookup(struct vop_lookup_args *ap)
108 struct componentname *cnp = ap->a_cnp;
109 struct vnode **vpp = ap->a_vpp;
110 struct vnode *dvp = ap->a_dvp;
111 char *pname = cnp->cn_nameptr;
112 struct portalnode *pt;
114 struct vnode *fvp = 0;
120 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)
123 if (cnp->cn_namelen == 1 && *pname == '.') {
131 * Do the MALLOC before the getnewvnode since doing so afterward
132 * might cause a bogus v_data pointer to get dereferenced
133 * elsewhere if MALLOC should block.
135 MALLOC(pt, struct portalnode *, sizeof(struct portalnode),
138 error = getnewvnode(VT_PORTAL, dvp->v_mount, dvp->v_mount->mnt_vn_ops,
147 * Save all of the remaining pathname and
148 * advance the namei next pointer to the end
151 for (size = 0, path = pname; *path; path++)
153 cnp->cn_consume = size - cnp->cn_namelen;
155 pt->pt_arg = malloc(size+1, M_TEMP, M_WAITOK);
156 pt->pt_size = size+1;
157 bcopy(pname, pt->pt_arg, pt->pt_size);
158 pt->pt_fileid = portal_fileid++;
171 portal_connect(struct socket *so, struct socket *so2)
173 /* from unp_connect, bypassing the namei stuff... */
179 return (ECONNREFUSED);
181 if (so->so_type != so2->so_type)
184 if ((so2->so_options & SO_ACCEPTCONN) == 0)
185 return (ECONNREFUSED);
187 if ((so3 = sonewconn(so2, 0)) == 0)
188 return (ECONNREFUSED);
190 unp2 = sotounpcb(so2);
191 unp3 = sotounpcb(so3);
193 unp3->unp_addr = (struct sockaddr_un *)
194 dup_sockaddr((struct sockaddr *)unp2->unp_addr);
197 return (unp_connect2(so, so2));
201 * portal_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
202 * struct thread *a_td)
205 portal_open(struct vop_open_args *ap)
207 struct socket *so = 0;
208 struct portalnode *pt;
209 struct thread *td = ap->a_td;
210 struct vnode *vp = ap->a_vp;
213 struct iovec aiov[2];
216 struct cmsghdr *cmsg;
222 struct portalmount *fmp;
224 struct portal_cred pcred;
227 * Nothing to do when opening the root node.
229 if (vp->v_flag & VROOT)
233 * Can't be opened unless the caller is set up
234 * to deal with the side effects. Check for this
235 * by testing whether the p_dupfd has been set.
237 KKASSERT(td->td_proc);
238 if (td->td_proc->p_dupfd >= 0)
242 fmp = VFSTOPORTAL(vp->v_mount);
245 * Create a new socket.
247 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, ap->a_td);
252 * Reserve some buffer space
254 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */
255 error = soreserve(so, res, res, &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
260 * Kick off connection
262 error = portal_connect(so, (struct socket *)fmp->pm_server->f_data);
267 * Wait for connection to complete
270 * XXX: Since the mount point is holding a reference on the
271 * underlying server socket, it is not easy to find out whether
272 * the server process is still running. To handle this problem
273 * we loop waiting for the new socket to be connected (something
274 * which will only happen if the server is still running) or for
275 * the reference count on the server socket to drop to 1, which
276 * will happen if the server dies. Sleep for 5 second intervals
277 * and keep polling the reference count. XXX.
280 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
281 if (fmp->pm_server->f_count == 1) {
282 error = ECONNREFUSED;
286 (void) tsleep((caddr_t) &so->so_timeo, 0, "portalcon", 5 * hz);
291 error = so->so_error;
296 * Set miscellaneous flags
298 so->so_rcv.sb_timeo = 0;
299 so->so_snd.sb_timeo = 0;
300 so->so_rcv.sb_flags |= SB_NOINTR;
301 so->so_snd.sb_flags |= SB_NOINTR;
304 pcred.pcr_flag = ap->a_mode;
305 pcred.pcr_uid = ap->a_cred->cr_uid;
306 pcred.pcr_ngroups = ap->a_cred->cr_ngroups;
307 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t));
308 aiov[0].iov_base = (caddr_t) &pcred;
309 aiov[0].iov_len = sizeof(pcred);
310 aiov[1].iov_base = pt->pt_arg;
311 aiov[1].iov_len = pt->pt_size;
314 auio.uio_rw = UIO_WRITE;
315 auio.uio_segflg = UIO_SYSSPACE;
318 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len;
320 error = sosend(so, (struct sockaddr *) 0, &auio,
321 (struct mbuf *) 0, (struct mbuf *) 0, 0, td);
325 len = auio.uio_resid = sizeof(int);
328 int flags = MSG_WAITALL;
329 error = soreceive(so, (struct sockaddr **) 0, &auio,
335 * Grab an error code from the mbuf.
338 m = m_pullup(m, sizeof(int)); /* Needed? */
340 error = *(mtod(m, int *));
347 error = ECONNRESET; /* XXX */
353 } while (cm == 0 && auio.uio_resid == len && !error);
358 if (auio.uio_resid) {
367 * XXX: Break apart the control message, and retrieve the
368 * received file descriptor. Note that more than one descriptor
369 * may have been received, or that the rights chain may have more
370 * than a single mbuf in it. What to do?
372 cmsg = mtod(cm, struct cmsghdr *);
373 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int);
375 error = ECONNREFUSED;
379 * At this point the rights message consists of a control message
380 * header, followed by a data region containing a vector of
381 * integer file descriptors. The fds were allocated by the action
382 * of receiving the control message.
384 ip = (int *) (cmsg + 1);
391 printf("portal_open: %d extra fds\n", newfds - 1);
392 for (i = 1; i < newfds; i++) {
393 portal_closefd(td, *ip);
399 * Check that the mode the file is being opened for is a subset
400 * of the mode of the existing descriptor.
402 KKASSERT(td->td_proc);
403 fp = td->td_proc->p_fd->fd_ofiles[fd];
404 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) {
405 portal_closefd(td, fd);
411 * Save the dup fd in the proc structure then return the
412 * special error code (ENXIO) which causes magic things to
413 * happen in vn_open. The whole concept is, well, hmmm.
415 td->td_proc->p_dupfd = fd;
420 * And discard the control message.
434 * portal_getattr(struct vnode *a_vp, struct vattr *a_vap,
435 * struct ucred *a_cred, struct thread *a_td)
438 portal_getattr(struct vop_getattr_args *ap)
440 struct vnode *vp = ap->a_vp;
441 struct vattr *vap = ap->a_vap;
443 bzero(vap, sizeof(*vap));
447 vap->va_size = DEV_BSIZE;
448 vap->va_blocksize = DEV_BSIZE;
449 nanotime(&vap->va_atime);
450 vap->va_mtime = vap->va_atime;
451 vap->va_ctime = vap->va_mtime;
455 /* vap->va_qbytes = 0; */
457 /* vap->va_qsize = 0; */
458 if (vp->v_flag & VROOT) {
460 vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR|
461 S_IRGRP|S_IWGRP|S_IXGRP|
462 S_IROTH|S_IWOTH|S_IXOTH;
467 vap->va_mode = S_IRUSR|S_IWUSR|
471 vap->va_fileid = VTOPORTAL(vp)->pt_fileid;
477 * portal_setattr(struct vnode *a_vp, struct vattr *a_vap,
478 * struct ucred *a_cred, struct thread *a_td)
481 portal_setattr(struct vop_setattr_args *ap)
484 * Can't mess with the root vnode
486 if (ap->a_vp->v_flag & VROOT)
489 if (ap->a_vap->va_flags != VNOVAL)
496 * Fake readdir, just return empty directory.
497 * It is hard to deal with '.' and '..' so don't bother.
499 * portal_readdir(struct vnode *a_vp, struct uio *a_uio,
500 * struct ucred *a_cred, int *a_eofflag,
501 * u_long *a_cookies, int a_ncookies)
504 portal_readdir(struct vop_readdir_args *ap)
507 * We don't allow exporting portal mounts, and currently local
508 * requests do not need cookies.
511 panic("portal_readdir: not hungry");
517 * portal_inactive(struct vnode *a_vp, struct thread *a_td)
520 portal_inactive(struct vop_inactive_args *ap)
522 VOP_UNLOCK(ap->a_vp, NULL, 0, ap->a_td);
527 * portal_reclaim(struct vnode *a_vp)
530 portal_reclaim(struct vop_reclaim_args *ap)
532 struct portalnode *pt = VTOPORTAL(ap->a_vp);
535 free((caddr_t) pt->pt_arg, M_TEMP);
538 FREE(ap->a_vp->v_data, M_TEMP);
539 ap->a_vp->v_data = 0;
546 * Print out the contents of a Portal vnode.
548 * portal_print(struct vnode *a_vp)
552 portal_print(struct vop_print_args *ap)
554 printf("tag VT_PORTAL, portal vnode\n");
560 * Portal "should never get here" operation
566 panic("portal: bad op");
570 struct vnodeopv_entry_desc portal_vnodeop_entries[] = {
571 { &vop_default_desc, vop_defaultop },
572 { &vop_access_desc, vop_null },
573 { &vop_bmap_desc, (void *) portal_badop },
574 { &vop_getattr_desc, (void *) portal_getattr },
575 { &vop_inactive_desc, (void *) portal_inactive },
576 { &vop_lookup_desc, (void *) portal_lookup },
577 { &vop_open_desc, (void *) portal_open },
578 { &vop_pathconf_desc, (void *) vop_stdpathconf },
579 { &vop_print_desc, (void *) portal_print },
580 { &vop_readdir_desc, (void *) portal_readdir },
581 { &vop_reclaim_desc, (void *) portal_reclaim },
582 { &vop_setattr_desc, (void *) portal_setattr },