2 * Copyright (c) 1992, 1993
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32 * @(#)portal_vnops.c 8.14 (Berkeley) 5/21/95
34 * $FreeBSD: src/sys/miscfs/portal/portal_vnops.c,v 1.38 1999/12/21 06:29:00 chris Exp $
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/sysproto.h>
44 #include <sys/kernel.h>
47 #include <sys/filedesc.h>
48 #include <sys/vnode.h>
49 #include <sys/fcntl.h>
52 #include <sys/mount.h>
53 #include <sys/malloc.h>
54 #include <sys/namei.h>
56 #include <sys/resourcevar.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
60 #include <sys/unpcb.h>
63 #include <sys/thread2.h>
65 static int portal_fileid = PORTAL_ROOTFILEID+1;
67 static int portal_badop (void);
68 static void portal_closefd (struct thread *td, int fd);
69 static int portal_connect (struct socket *so, struct socket *so2);
70 static int portal_getattr (struct vop_getattr_args *ap);
71 static int portal_inactive (struct vop_inactive_args *ap);
72 static int portal_lookup (struct vop_old_lookup_args *ap);
73 static int portal_open (struct vop_open_args *ap);
74 static int portal_print (struct vop_print_args *ap);
75 static int portal_readdir (struct vop_readdir_args *ap);
76 static int portal_reclaim (struct vop_reclaim_args *ap);
77 static int portal_setattr (struct vop_setattr_args *ap);
80 portal_closefd(struct thread *td, int fd)
86 error = sys_close(&ua);
88 * We should never get an error, and there isn't anything
89 * we could do if we got one, so just print a message.
92 kprintf("portal_closefd: error = %d\n", error);
96 * vp is the current namei directory
97 * cnp is the name to locate in that directory...
99 * portal_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
100 * struct componentname *a_cnp)
103 portal_lookup(struct vop_old_lookup_args *ap)
105 struct componentname *cnp = ap->a_cnp;
106 struct vnode **vpp = ap->a_vpp;
107 struct vnode *dvp = ap->a_dvp;
108 char *pname = cnp->cn_nameptr;
109 struct portalnode *pt;
111 struct vnode *fvp = NULL;
117 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)
120 if (cnp->cn_namelen == 1 && *pname == '.') {
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 pt = kmalloc(sizeof(struct portalnode), M_TEMP, M_WAITOK);
133 error = getnewvnode(VT_PORTAL, dvp->v_mount, &fvp, 0, 0);
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 = kmalloc(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++;
166 portal_connect(struct socket *so, struct socket *so2)
168 /* from unp_connect, bypassing the namei stuff... */
174 return (ECONNREFUSED);
176 if (so->so_type != so2->so_type)
179 if ((so2->so_options & SO_ACCEPTCONN) == 0)
180 return (ECONNREFUSED);
182 if ((so3 = sonewconn(so2, 0)) == NULL)
183 return (ECONNREFUSED);
188 unp3->unp_addr = (struct sockaddr_un *)
189 dup_sockaddr((struct sockaddr *)unp2->unp_addr);
192 return (unp_connect2(so, so2));
196 * portal_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
200 portal_open(struct vop_open_args *ap)
202 struct socket *so = NULL;
203 struct portalnode *pt;
204 struct thread *td = curthread;
205 struct vnode *vp = ap->a_vp;
207 struct iovec aiov[2];
210 struct mbuf *cm = NULL;
211 struct cmsghdr *cmsg;
217 struct portalmount *fmp;
219 struct portal_cred pcred;
222 * Nothing to do when opening the root node.
224 if (vp->v_flag & VROOT)
225 return (vop_stdopen(ap));
228 * Can't be opened unless the caller is set up
229 * to deal with the side effects. Check for this
230 * by testing whether the p_dupfd has been set.
232 KKASSERT(td->td_proc);
233 if (td->td_lwp->lwp_dupfd >= 0)
237 fmp = VFSTOPORTAL(vp->v_mount);
240 * Create a new socket.
242 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, td);
247 * Reserve some buffer space
249 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */
250 error = soreserve(so, res, res, &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
255 * Kick off connection
257 error = portal_connect(so, (struct socket *)fmp->pm_server->f_data);
262 * Wait for connection to complete
265 * XXX: Since the mount point is holding a reference on the
266 * underlying server socket, it is not easy to find out whether
267 * the server process is still running. To handle this problem
268 * we loop waiting for the new socket to be connected (something
269 * which will only happen if the server is still running) or for
270 * the reference count on the server socket to drop to 1, which
271 * will happen if the server dies. Sleep for 5 second intervals
272 * and keep polling the reference count. XXX.
275 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
276 if (fmp->pm_server->f_count == 1) {
277 error = ECONNREFUSED;
281 (void) tsleep((caddr_t) &so->so_timeo, 0, "portalcon", 5 * hz);
286 error = so->so_error;
291 * Set miscellaneous flags
293 so->so_rcv.ssb_timeo = 0;
294 so->so_snd.ssb_timeo = 0;
295 atomic_set_int(&so->so_rcv.ssb_flags, SSB_NOINTR);
296 atomic_set_int(&so->so_snd.ssb_flags, SSB_NOINTR);
299 pcred.pcr_flag = ap->a_mode;
300 pcred.pcr_uid = ap->a_cred->cr_uid;
301 pcred.pcr_ngroups = ap->a_cred->cr_ngroups;
302 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t));
303 aiov[0].iov_base = (caddr_t) &pcred;
304 aiov[0].iov_len = sizeof(pcred);
305 aiov[1].iov_base = pt->pt_arg;
306 aiov[1].iov_len = pt->pt_size;
309 auio.uio_rw = UIO_WRITE;
310 auio.uio_segflg = UIO_SYSSPACE;
313 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len;
315 error = sosend(so, NULL, &auio, NULL, NULL, 0, td);
326 error = soreceive(so, NULL, NULL, &sio, &cm, &flags);
331 * Grab an error code from the mbuf.
333 if ((m = sio.sb_mb) != NULL) {
334 m = m_pullup(m, sizeof(int)); /* Needed? */
336 error = *(mtod(m, int *));
343 error = ECONNRESET; /* XXX */
349 } while (cm == NULL && sio.sb_cc == 0 && !error);
354 if (auio.uio_resid) {
363 * XXX: Break apart the control message, and retrieve the
364 * received file descriptor. Note that more than one descriptor
365 * may have been received, or that the rights chain may have more
366 * than a single mbuf in it. What to do?
368 cmsg = mtod(cm, struct cmsghdr *);
369 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int);
371 error = ECONNREFUSED;
375 * At this point the rights message consists of a control message
376 * header, followed by a data region containing a vector of
377 * integer file descriptors. The fds were allocated by the action
378 * of receiving the control message.
380 ip = (int *) (cmsg + 1);
387 kprintf("portal_open: %d extra fds\n", newfds - 1);
388 for (i = 1; i < newfds; i++) {
389 portal_closefd(td, *ip);
395 * Check that the mode the file is being opened for is a subset
396 * of the mode of the existing descriptor.
398 KKASSERT(td->td_proc);
399 fp = td->td_proc->p_fd->fd_files[fd].fp;
400 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) {
401 portal_closefd(td, fd);
407 * Save the dup fd in the proc structure then return the
408 * special error code (ENXIO) which causes magic things to
409 * happen in vn_open. The whole concept is, well, hmmm.
411 td->td_lwp->lwp_dupfd = fd;
417 * And discard the control message.
424 soshutdown(so, SHUT_RDWR);
425 soclose(so, FNONBLOCK);
431 * portal_getattr(struct vnode *a_vp, struct vattr *a_vap)
434 portal_getattr(struct vop_getattr_args *ap)
436 struct vnode *vp = ap->a_vp;
437 struct vattr *vap = ap->a_vap;
439 bzero(vap, sizeof(*vap));
443 vap->va_size = DEV_BSIZE;
444 vap->va_blocksize = DEV_BSIZE;
445 nanotime(&vap->va_atime);
446 vap->va_mtime = vap->va_atime;
447 vap->va_ctime = vap->va_mtime;
450 vap->va_rmajor = VNOVAL;
451 vap->va_rminor = VNOVAL;
452 /* vap->va_qbytes = 0; */
454 /* vap->va_qsize = 0; */
455 if (vp->v_flag & VROOT) {
457 vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR|
458 S_IRGRP|S_IWGRP|S_IXGRP|
459 S_IROTH|S_IWOTH|S_IXOTH;
464 vap->va_mode = S_IRUSR|S_IWUSR|
468 vap->va_fileid = VTOPORTAL(vp)->pt_fileid;
474 * portal_setattr(struct vnode *a_vp, struct vattr *a_vap,
475 * struct ucred *a_cred)
478 portal_setattr(struct vop_setattr_args *ap)
481 * Can't mess with the root vnode
483 if (ap->a_vp->v_flag & VROOT)
486 if (ap->a_vap->va_flags != VNOVAL)
493 * Fake readdir, just return empty directory.
494 * It is hard to deal with '.' and '..' so don't bother.
496 * portal_readdir(struct vnode *a_vp, struct uio *a_uio,
497 * struct ucred *a_cred, int *a_eofflag,
498 * off_t *a_cookies, int a_ncookies)
501 portal_readdir(struct vop_readdir_args *ap)
504 * We don't allow exporting portal mounts, and currently local
505 * requests do not need cookies.
508 panic("portal_readdir: not hungry");
514 * portal_inactive(struct vnode *a_vp)
517 portal_inactive(struct vop_inactive_args *ap)
523 * portal_reclaim(struct vnode *a_vp)
526 portal_reclaim(struct vop_reclaim_args *ap)
528 struct portalnode *pt = VTOPORTAL(ap->a_vp);
531 kfree((caddr_t) pt->pt_arg, M_TEMP);
534 kfree(ap->a_vp->v_data, M_TEMP);
535 ap->a_vp->v_data = 0;
542 * Print out the contents of a Portal vnode.
544 * portal_print(struct vnode *a_vp)
548 portal_print(struct vop_print_args *ap)
550 kprintf("tag VT_PORTAL, portal vnode\n");
556 * Portal "should never get here" operation
562 panic("portal: bad op");
566 struct vop_ops portal_vnode_vops = {
567 .vop_default = vop_defaultop,
568 .vop_access = (void *)vop_null,
569 .vop_bmap = (void *)portal_badop,
570 .vop_getattr = portal_getattr,
571 .vop_inactive = portal_inactive,
572 .vop_old_lookup = portal_lookup,
573 .vop_open = portal_open,
574 .vop_pathconf = vop_stdpathconf,
575 .vop_print = portal_print,
576 .vop_readdir = portal_readdir,
577 .vop_reclaim = portal_reclaim,
578 .vop_setattr = portal_setattr