Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/portalfs/portal_vnops.c
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1 /*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software donated to Berkeley by 6 * Jan-Simon Pendry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)portal_vnops.c 8.14 (Berkeley) 5/21/95 33 * 34 * $FreeBSD$ 35 */ 36 37 /* 38 * Portal Filesystem 39 */ 40 41 #include <sys/param.h> 42 #include <sys/fcntl.h> 43 #include <sys/file.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/mount.h> 49 #include <sys/mutex.h> 50 #include <sys/namei.h> 51 #include <sys/proc.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/stat.h> 55 #include <sys/sysproto.h> 56 #include <sys/systm.h> 57 #include <sys/un.h> 58 #include <sys/unpcb.h> 59 #include <sys/vnode.h> 60 61 #include <fs/portalfs/portal.h> 62 63 static int portal_fileid = PORTAL_ROOTFILEID+1; 64 65 static void portal_closefd(struct thread *td, int fd); 66 static int portal_connect(struct socket *so, struct socket *so2); 67 static int portal_getattr(struct vop_getattr_args *ap); 68 static int portal_lookup(struct vop_lookup_args *ap); 69 static int portal_open(struct vop_open_args *ap); 70 static int portal_readdir(struct vop_readdir_args *ap); 71 static int portal_reclaim(struct vop_reclaim_args *ap); 72 static int portal_setattr(struct vop_setattr_args *ap); 73 74 static void 75 portal_closefd(td, fd) 76 struct thread *td; 77 int fd; 78 { 79 int error; 80 struct close_args ua; 81 82 ua.fd = fd; 83 error = close(td, &ua); 84 /* 85 * We should never get an error, and there isn't anything 86 * we could do if we got one, so just print a message. 87 */ 88 if (error) 89 printf("portal_closefd: error = %d\n", error); 90 } 91 92 /* 93 * vp is the current namei directory 94 * cnp is the name to locate in that directory... 95 */ 96 static int 97 portal_lookup(ap) 98 struct vop_lookup_args /* { 99 struct vnode * a_dvp; 100 struct vnode ** a_vpp; 101 struct componentname * a_cnp; 102 } */ *ap; 103 { 104 struct componentname *cnp = ap->a_cnp; 105 struct vnode **vpp = ap->a_vpp; 106 struct vnode *dvp = ap->a_dvp; 107 char *pname = cnp->cn_nameptr; 108 struct thread *td = cnp->cn_thread; 109 struct portalnode *pt; 110 int error; 111 struct vnode *fvp = 0; 112 char *path; 113 int size; 114 115 *vpp = NULLVP; 116 117 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 118 return (EROFS); 119 120 if (cnp->cn_namelen == 1 && *pname == '.') { 121 *vpp = dvp; 122 VREF(dvp); 123 return (0); 124 } 125 126 /* 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. 130 */ 131 MALLOC(pt, struct portalnode *, sizeof(struct portalnode), 132 M_TEMP, M_WAITOK); 133 134 error = getnewvnode("portal", dvp->v_mount, portal_vnodeop_p, &fvp); 135 if (error) { 136 FREE(pt, M_TEMP); 137 goto bad; 138 } 139 fvp->v_type = VREG; 140 fvp->v_data = pt; 141 /* 142 * Save all of the remaining pathname and 143 * advance the namei next pointer to the end 144 * of the string. 145 */ 146 for (size = 0, path = pname; *path; path++) 147 size++; 148 cnp->cn_consume = size - cnp->cn_namelen; 149 150 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++; 154 155 *vpp = fvp; 156 vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, td); 157 /* 158 * As we are the last component of the path name, fix up 159 * the locking on the directory node. 160 */ 161 if ((cnp->cn_flags & LOCKPARENT) == 0) { 162 VOP_UNLOCK(dvp, 0, td); 163 cnp->cn_flags |= PDIRUNLOCK; 164 } 165 return (0); 166 167 bad:; 168 if (fvp) 169 vrele(fvp); 170 return (error); 171 } 172 173 static int 174 portal_connect(so, so2) 175 struct socket *so; 176 struct socket *so2; 177 { 178 /* from unp_connect, bypassing the namei stuff... */ 179 struct socket *so3; 180 struct unpcb *unp2; 181 struct unpcb *unp3; 182 183 if (so2 == 0) 184 return (ECONNREFUSED); 185 186 if (so->so_type != so2->so_type) 187 return (EPROTOTYPE); 188 189 if ((so2->so_options & SO_ACCEPTCONN) == 0) 190 return (ECONNREFUSED); 191 192 if ((so3 = sonewconn(so2, 0)) == 0) 193 return (ECONNREFUSED); 194 195 unp2 = sotounpcb(so2); 196 unp3 = sotounpcb(so3); 197 if (unp2->unp_addr) 198 unp3->unp_addr = (struct sockaddr_un *) 199 sodupsockaddr((struct sockaddr *)unp2->unp_addr, 200 M_NOWAIT); 201 so2 = so3; 202 203 return (uipc_connect2(so, so2)); 204 } 205 206 static int 207 portal_open(ap) 208 struct vop_open_args /* { 209 struct vnode *a_vp; 210 int a_mode; 211 struct ucred *a_cred; 212 struct thread *a_td; 213 } */ *ap; 214 { 215 struct socket *so = 0; 216 struct portalnode *pt; 217 struct thread *td = ap->a_td; 218 struct vnode *vp = ap->a_vp; 219 struct uio auio; 220 struct iovec aiov[2]; 221 int res; 222 struct mbuf *cm = 0; 223 struct cmsghdr *cmsg; 224 int newfds; 225 int *ip; 226 int fd; 227 int error; 228 int len; 229 struct portalmount *fmp; 230 struct file *fp; 231 struct portal_cred pcred; 232 233 /* 234 * Nothing to do when opening the root node. 235 */ 236 if (vp->v_vflag & VV_ROOT) 237 return (0); 238 239 /* 240 * Can't be opened unless the caller is set up 241 * to deal with the side effects. Check for this 242 * by testing whether the p_dupfd has been set. 243 */ 244 if (td->td_dupfd >= 0) 245 return (ENODEV); 246 247 pt = VTOPORTAL(vp); 248 fmp = VFSTOPORTAL(vp->v_mount); 249 250 /* 251 * Create a new socket. 252 */ 253 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, ap->a_td->td_ucred, 254 ap->a_td); 255 if (error) 256 goto bad; 257 258 /* 259 * Reserve some buffer space 260 */ 261 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */ 262 error = soreserve(so, res, res); 263 if (error) 264 goto bad; 265 266 /* 267 * Kick off connection 268 */ 269 error = portal_connect(so, fmp->pm_server->f_data); 270 if (error) 271 goto bad; 272 273 /* 274 * Wait for connection to complete 275 */ 276 /* 277 * XXX: Since the mount point is holding a reference on the 278 * underlying server socket, it is not easy to find out whether 279 * the server process is still running. To handle this problem 280 * we loop waiting for the new socket to be connected (something 281 * which will only happen if the server is still running) or for 282 * the reference count on the server socket to drop to 1, which 283 * will happen if the server dies. Sleep for 5 second intervals 284 * and keep polling the reference count. XXX. 285 */ 286 /* XXXRW: Locking? */ 287 SOCK_LOCK(so); 288 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 289 if (fmp->pm_server->f_count == 1) { 290 SOCK_UNLOCK(so); 291 error = ECONNREFUSED; 292 goto bad; 293 } 294 (void) msleep((caddr_t) &so->so_timeo, SOCK_MTX(so), PSOCK, 295 "portalcon", 5 * hz); 296 } 297 SOCK_UNLOCK(so); 298 299 if (so->so_error) { 300 error = so->so_error; 301 goto bad; 302 } 303 304 /* 305 * Set miscellaneous flags 306 */ 307 SOCKBUF_LOCK(&so->so_rcv); 308 so->so_rcv.sb_timeo = 0; 309 so->so_rcv.sb_flags |= SB_NOINTR; 310 SOCKBUF_UNLOCK(&so->so_rcv); 311 SOCKBUF_LOCK(&so->so_snd); 312 so->so_snd.sb_timeo = 0; 313 so->so_snd.sb_flags |= SB_NOINTR; 314 SOCKBUF_UNLOCK(&so->so_snd); 315 316 317 pcred.pcr_flag = ap->a_mode; 318 pcred.pcr_uid = ap->a_cred->cr_uid; 319 pcred.pcr_ngroups = ap->a_cred->cr_ngroups; 320 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t)); 321 aiov[0].iov_base = (caddr_t) &pcred; 322 aiov[0].iov_len = sizeof(pcred); 323 aiov[1].iov_base = pt->pt_arg; 324 aiov[1].iov_len = pt->pt_size; 325 auio.uio_iov = aiov; 326 auio.uio_iovcnt = 2; 327 auio.uio_rw = UIO_WRITE; 328 auio.uio_segflg = UIO_SYSSPACE; 329 auio.uio_td = td; 330 auio.uio_offset = 0; 331 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len; 332 333 error = sosend(so, (struct sockaddr *) 0, &auio, 334 (struct mbuf *) 0, (struct mbuf *) 0, 0 , td); 335 if (error) 336 goto bad; 337 338 len = auio.uio_resid = sizeof(int); 339 do { 340 struct mbuf *m = 0; 341 int flags = MSG_WAITALL; 342 error = soreceive(so, (struct sockaddr **) 0, &auio, 343 &m, &cm, &flags); 344 if (error) 345 goto bad; 346 347 /* 348 * Grab an error code from the mbuf. 349 */ 350 if (m) { 351 m = m_pullup(m, sizeof(int)); /* Needed? */ 352 if (m) { 353 error = *(mtod(m, int *)); 354 m_freem(m); 355 } else { 356 error = EINVAL; 357 } 358 } else { 359 if (cm == 0) { 360 error = ECONNRESET; /* XXX */ 361 #ifdef notdef 362 break; 363 #endif 364 } 365 } 366 } while (cm == 0 && auio.uio_resid == len && !error); 367 368 if (cm == 0) 369 goto bad; 370 371 if (auio.uio_resid) { 372 error = 0; 373 #ifdef notdef 374 error = EMSGSIZE; 375 goto bad; 376 #endif 377 } 378 379 /* 380 * XXX: Break apart the control message, and retrieve the 381 * received file descriptor. Note that more than one descriptor 382 * may have been received, or that the rights chain may have more 383 * than a single mbuf in it. What to do? 384 */ 385 cmsg = mtod(cm, struct cmsghdr *); 386 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int); 387 if (newfds == 0) { 388 error = ECONNREFUSED; 389 goto bad; 390 } 391 /* 392 * At this point the rights message consists of a control message 393 * header, followed by a data region containing a vector of 394 * integer file descriptors. The fds were allocated by the action 395 * of receiving the control message. 396 */ 397 ip = (int *) (cmsg + 1); 398 fd = *ip++; 399 if (newfds > 1) { 400 /* 401 * Close extra fds. 402 */ 403 int i; 404 printf("portal_open: %d extra fds\n", newfds - 1); 405 for (i = 1; i < newfds; i++) { 406 portal_closefd(td, *ip); 407 ip++; 408 } 409 } 410 411 /* 412 * Check that the mode the file is being opened for is a subset 413 * of the mode of the existing descriptor. 414 */ 415 if ((error = fget(td, fd, &fp)) != 0) 416 goto bad; 417 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) { 418 fdrop(fp, td); 419 portal_closefd(td, fd); 420 error = EACCES; 421 goto bad; 422 } 423 fdrop(fp, td); 424 425 /* 426 * Save the dup fd in the proc structure then return the 427 * special error code (ENXIO) which causes magic things to 428 * happen in vn_open. The whole concept is, well, hmmm. 429 */ 430 td->td_dupfd = fd; 431 error = ENXIO; 432 433 bad:; 434 /* 435 * And discard the control message. 436 */ 437 if (cm) { 438 m_freem(cm); 439 } 440 441 if (so) { 442 soshutdown(so, 2); 443 soclose(so); 444 } 445 return (error); 446 } 447 448 static int 449 portal_getattr(ap) 450 struct vop_getattr_args /* { 451 struct vnode *a_vp; 452 struct vattr *a_vap; 453 struct ucred *a_cred; 454 struct thread *a_td; 455 } */ *ap; 456 { 457 struct vnode *vp = ap->a_vp; 458 struct vattr *vap = ap->a_vap; 459 460 bzero(vap, sizeof(*vap)); 461 vattr_null(vap); 462 vap->va_uid = 0; 463 vap->va_gid = 0; 464 vap->va_size = DEV_BSIZE; 465 vap->va_blocksize = DEV_BSIZE; 466 nanotime(&vap->va_atime); 467 vap->va_mtime = vap->va_atime; 468 vap->va_ctime = vap->va_mtime; 469 vap->va_gen = 0; 470 vap->va_flags = 0; 471 vap->va_rdev = 0; 472 /* vap->va_qbytes = 0; */ 473 vap->va_bytes = 0; 474 /* vap->va_qsize = 0; */ 475 if (vp->v_vflag & VV_ROOT) { 476 vap->va_type = VDIR; 477 vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR| 478 S_IRGRP|S_IWGRP|S_IXGRP| 479 S_IROTH|S_IWOTH|S_IXOTH; 480 vap->va_nlink = 2; 481 vap->va_fileid = 2; 482 } else { 483 vap->va_type = VREG; 484 vap->va_mode = S_IRUSR|S_IWUSR| 485 S_IRGRP|S_IWGRP| 486 S_IROTH|S_IWOTH; 487 vap->va_nlink = 1; 488 vap->va_fileid = VTOPORTAL(vp)->pt_fileid; 489 } 490 return (0); 491 } 492 493 static int 494 portal_setattr(ap) 495 struct vop_setattr_args /* { 496 struct vnode *a_vp; 497 struct vattr *a_vap; 498 struct ucred *a_cred; 499 struct thread *a_td; 500 } */ *ap; 501 { 502 503 /* 504 * Can't mess with the root vnode 505 */ 506 if (ap->a_vp->v_vflag & VV_ROOT) 507 return (EACCES); 508 509 if (ap->a_vap->va_flags != VNOVAL) 510 return (EOPNOTSUPP); 511 512 return (0); 513 } 514 515 /* 516 * Fake readdir, just return empty directory. 517 * It is hard to deal with '.' and '..' so don't bother. 518 */ 519 static int 520 portal_readdir(ap) 521 struct vop_readdir_args /* { 522 struct vnode *a_vp; 523 struct uio *a_uio; 524 struct ucred *a_cred; 525 int *a_eofflag; 526 u_long *a_cookies; 527 int a_ncookies; 528 } */ *ap; 529 { 530 531 /* 532 * We don't allow exporting portal mounts, and currently local 533 * requests do not need cookies. 534 */ 535 if (ap->a_ncookies) 536 panic("portal_readdir: not hungry"); 537 538 return (0); 539 } 540 541 static int 542 portal_reclaim(ap) 543 struct vop_reclaim_args /* { 544 struct vnode *a_vp; 545 } */ *ap; 546 { 547 struct portalnode *pt = VTOPORTAL(ap->a_vp); 548 549 if (pt->pt_arg) { 550 free((caddr_t) pt->pt_arg, M_TEMP); 551 pt->pt_arg = 0; 552 } 553 FREE(ap->a_vp->v_data, M_TEMP); 554 ap->a_vp->v_data = 0; 555 556 return (0); 557 } 558 559 vop_t **portal_vnodeop_p; 560 static struct vnodeopv_entry_desc portal_vnodeop_entries[] = { 561 { &vop_default_desc, (vop_t *) vop_defaultop }, 562 { &vop_access_desc, (vop_t *) vop_null }, 563 { &vop_getattr_desc, (vop_t *) portal_getattr }, 564 { &vop_lookup_desc, (vop_t *) portal_lookup }, 565 { &vop_open_desc, (vop_t *) portal_open }, 566 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf }, 567 { &vop_readdir_desc, (vop_t *) portal_readdir }, 568 { &vop_reclaim_desc, (vop_t *) portal_reclaim }, 569 { &vop_setattr_desc, (vop_t *) portal_setattr }, 570 { NULL, NULL } 571 }; 572 static struct vnodeopv_desc portal_vnodeop_opv_desc = 573 { &portal_vnodeop_p, portal_vnodeop_entries }; 574 575 VNODEOP_SET(portal_vnodeop_opv_desc);
Cache object: c7fb15a9c514be6bfaa2d2592d4ae78e
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