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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 1.38 2007/08/08 00:12:52 swildner 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 #include <sys/thread2.h>
70 static int portal_fileid = PORTAL_ROOTFILEID+1;
72 static int portal_badop (void);
73 static void portal_closefd (struct thread *td, int fd);
74 static int portal_connect (struct socket *so, struct socket *so2);
75 static int portal_getattr (struct vop_getattr_args *ap);
76 static int portal_inactive (struct vop_inactive_args *ap);
77 static int portal_lookup (struct vop_old_lookup_args *ap);
78 static int portal_open (struct vop_open_args *ap);
79 static int portal_print (struct vop_print_args *ap);
80 static int portal_readdir (struct vop_readdir_args *ap);
81 static int portal_reclaim (struct vop_reclaim_args *ap);
82 static int portal_setattr (struct vop_setattr_args *ap);
85 portal_closefd(struct thread *td, int fd)
91 error = sys_close(&ua);
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 kprintf("portal_closefd: error = %d\n", error);
101 * vp is the current namei directory
102 * cnp is the name to locate in that directory...
104 * portal_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
105 * struct componentname *a_cnp)
108 portal_lookup(struct vop_old_lookup_args *ap)
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 == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)
125 if (cnp->cn_namelen == 1 && *pname == '.') {
132 * Do the MALLOC before the getnewvnode since doing so afterward
133 * might cause a bogus v_data pointer to get dereferenced
134 * elsewhere if MALLOC should block.
136 MALLOC(pt, struct portalnode *, sizeof(struct portalnode),
139 error = getnewvnode(VT_PORTAL, dvp->v_mount, &fvp, 0, 0);
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 = kmalloc(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(struct socket *so, struct socket *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);
194 unp3->unp_addr = (struct sockaddr_un *)
195 dup_sockaddr((struct sockaddr *)unp2->unp_addr);
198 return (unp_connect2(so, so2));
202 * portal_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
206 portal_open(struct vop_open_args *ap)
208 struct socket *so = 0;
209 struct portalnode *pt;
210 struct thread *td = curthread;
211 struct vnode *vp = ap->a_vp;
213 struct iovec aiov[2];
217 struct cmsghdr *cmsg;
223 struct portalmount *fmp;
225 struct portal_cred pcred;
228 * Nothing to do when opening the root node.
230 if (vp->v_flag & VROOT)
231 return (vop_stdopen(ap));
234 * Can't be opened unless the caller is set up
235 * to deal with the side effects. Check for this
236 * by testing whether the p_dupfd has been set.
238 KKASSERT(td->td_proc);
239 if (td->td_lwp->lwp_dupfd >= 0)
243 fmp = VFSTOPORTAL(vp->v_mount);
246 * Create a new socket.
248 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, td);
253 * Reserve some buffer space
255 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */
256 error = soreserve(so, res, res, &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
261 * Kick off connection
263 error = portal_connect(so, (struct socket *)fmp->pm_server->f_data);
268 * Wait for connection to complete
271 * XXX: Since the mount point is holding a reference on the
272 * underlying server socket, it is not easy to find out whether
273 * the server process is still running. To handle this problem
274 * we loop waiting for the new socket to be connected (something
275 * which will only happen if the server is still running) or for
276 * the reference count on the server socket to drop to 1, which
277 * will happen if the server dies. Sleep for 5 second intervals
278 * and keep polling the reference count. XXX.
281 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
282 if (fmp->pm_server->f_count == 1) {
283 error = ECONNREFUSED;
287 (void) tsleep((caddr_t) &so->so_timeo, 0, "portalcon", 5 * hz);
292 error = so->so_error;
297 * Set miscellaneous flags
299 so->so_rcv.ssb_timeo = 0;
300 so->so_snd.ssb_timeo = 0;
301 so->so_rcv.ssb_flags |= SSB_NOINTR;
302 so->so_snd.ssb_flags |= SSB_NOINTR;
305 pcred.pcr_flag = ap->a_mode;
306 pcred.pcr_uid = ap->a_cred->cr_uid;
307 pcred.pcr_ngroups = ap->a_cred->cr_ngroups;
308 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t));
309 aiov[0].iov_base = (caddr_t) &pcred;
310 aiov[0].iov_len = sizeof(pcred);
311 aiov[1].iov_base = pt->pt_arg;
312 aiov[1].iov_len = pt->pt_size;
315 auio.uio_rw = UIO_WRITE;
316 auio.uio_segflg = UIO_SYSSPACE;
319 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len;
321 error = sosend(so, (struct sockaddr *) 0, &auio,
322 (struct mbuf *) 0, (struct mbuf *) 0, 0, td);
333 error = soreceive(so, NULL, NULL, &sio, &cm, &flags);
338 * Grab an error code from the mbuf.
340 if ((m = sio.sb_mb) != NULL) {
341 m = m_pullup(m, sizeof(int)); /* Needed? */
343 error = *(mtod(m, int *));
350 error = ECONNRESET; /* XXX */
356 } while (cm == NULL && sio.sb_cc == 0 && !error);
361 if (auio.uio_resid) {
370 * XXX: Break apart the control message, and retrieve the
371 * received file descriptor. Note that more than one descriptor
372 * may have been received, or that the rights chain may have more
373 * than a single mbuf in it. What to do?
375 cmsg = mtod(cm, struct cmsghdr *);
376 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int);
378 error = ECONNREFUSED;
382 * At this point the rights message consists of a control message
383 * header, followed by a data region containing a vector of
384 * integer file descriptors. The fds were allocated by the action
385 * of receiving the control message.
387 ip = (int *) (cmsg + 1);
394 kprintf("portal_open: %d extra fds\n", newfds - 1);
395 for (i = 1; i < newfds; i++) {
396 portal_closefd(td, *ip);
402 * Check that the mode the file is being opened for is a subset
403 * of the mode of the existing descriptor.
405 KKASSERT(td->td_proc);
406 fp = td->td_proc->p_fd->fd_files[fd].fp;
407 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) {
408 portal_closefd(td, 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.
418 td->td_lwp->lwp_dupfd = fd;
424 * And discard the control message.
431 soshutdown(so, SHUT_RDWR);
432 soclose(so, FNONBLOCK);
438 * portal_getattr(struct vnode *a_vp, struct vattr *a_vap)
441 portal_getattr(struct vop_getattr_args *ap)
443 struct vnode *vp = ap->a_vp;
444 struct vattr *vap = ap->a_vap;
446 bzero(vap, sizeof(*vap));
450 vap->va_size = DEV_BSIZE;
451 vap->va_blocksize = DEV_BSIZE;
452 nanotime(&vap->va_atime);
453 vap->va_mtime = vap->va_atime;
454 vap->va_ctime = vap->va_mtime;
457 vap->va_rmajor = VNOVAL;
458 vap->va_rminor = VNOVAL;
459 /* vap->va_qbytes = 0; */
461 /* vap->va_qsize = 0; */
462 if (vp->v_flag & VROOT) {
464 vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR|
465 S_IRGRP|S_IWGRP|S_IXGRP|
466 S_IROTH|S_IWOTH|S_IXOTH;
471 vap->va_mode = S_IRUSR|S_IWUSR|
475 vap->va_fileid = VTOPORTAL(vp)->pt_fileid;
481 * portal_setattr(struct vnode *a_vp, struct vattr *a_vap,
482 * struct ucred *a_cred)
485 portal_setattr(struct vop_setattr_args *ap)
488 * Can't mess with the root vnode
490 if (ap->a_vp->v_flag & VROOT)
493 if (ap->a_vap->va_flags != VNOVAL)
500 * Fake readdir, just return empty directory.
501 * It is hard to deal with '.' and '..' so don't bother.
503 * portal_readdir(struct vnode *a_vp, struct uio *a_uio,
504 * struct ucred *a_cred, int *a_eofflag,
505 * u_long *a_cookies, int a_ncookies)
508 portal_readdir(struct vop_readdir_args *ap)
511 * We don't allow exporting portal mounts, and currently local
512 * requests do not need cookies.
515 panic("portal_readdir: not hungry");
521 * portal_inactive(struct vnode *a_vp)
524 portal_inactive(struct vop_inactive_args *ap)
530 * portal_reclaim(struct vnode *a_vp)
533 portal_reclaim(struct vop_reclaim_args *ap)
535 struct portalnode *pt = VTOPORTAL(ap->a_vp);
538 kfree((caddr_t) pt->pt_arg, M_TEMP);
541 FREE(ap->a_vp->v_data, M_TEMP);
542 ap->a_vp->v_data = 0;
549 * Print out the contents of a Portal vnode.
551 * portal_print(struct vnode *a_vp)
555 portal_print(struct vop_print_args *ap)
557 kprintf("tag VT_PORTAL, portal vnode\n");
563 * Portal "should never get here" operation
569 panic("portal: bad op");
573 struct vop_ops portal_vnode_vops = {
574 .vop_default = vop_defaultop,
575 .vop_access = (void *)vop_null,
576 .vop_bmap = (void *)portal_badop,
577 .vop_getattr = portal_getattr,
578 .vop_inactive = portal_inactive,
579 .vop_old_lookup = portal_lookup,
580 .vop_open = portal_open,
581 .vop_pathconf = vop_stdpathconf,
582 .vop_print = portal_print,
583 .vop_readdir = portal_readdir,
584 .vop_reclaim = portal_reclaim,
585 .vop_setattr = portal_setattr