1 /*- 2 * Copyright (c) 2001 Dag-Erling Co�dan Sm�rgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/systm.h> 34 #include <sys/ctype.h> 35 #include <sys/dirent.h> 36 #include <sys/fcntl.h> 37 #include <sys/lock.h> 38 #include <sys/mount.h> 39 #include <sys/mutex.h> 40 #include <sys/namei.h> 41 #include <sys/proc.h> 42 #include <sys/sbuf.h> 43 #include <sys/sx.h> 44 #include <sys/sysctl.h> 45 #include <sys/vnode.h> 46 47 #include <fs/pseudofs/pseudofs.h> 48 #include <fs/pseudofs/pseudofs_internal.h> 49 50 #if 0 51 #define PFS_TRACE(foo) \ 52 do { \ 53 printf("pseudofs: %s(): line %d: ", __FUNCTION__, __LINE__); \ 54 printf foo ; \ 55 printf("\n"); \ 56 } while (0) 57 #define PFS_RETURN(err) \ 58 do { \ 59 printf("pseudofs: %s(): line %d: returning %d\n", \ 60 __FUNCTION__, __LINE__, err); \ 61 return (err); \ 62 } while (0) 63 #else 64 #define PFS_TRACE(foo) \ 65 do { /* nothing */ } while (0) 66 #define PFS_RETURN(err) \ 67 return (err) 68 #endif 69 70 /* 71 * Returns non-zero if given file is visible to given process 72 */ 73 static int 74 pfs_visible(struct thread *td, struct pfs_node *pn, pid_t pid) 75 { 76 struct proc *proc; 77 int r; 78 79 PFS_TRACE(("%s (pid: %d, req: %d)", 80 pn->pn_name, pid, td->td_proc->p_pid)); 81 82 if (pn->pn_flags & PFS_DISABLED) 83 PFS_RETURN (0); 84 85 r = 1; 86 if (pid != NO_PID) { 87 if ((proc = pfind(pid)) == NULL) 88 PFS_RETURN (0); 89 /* XXX should lock td->td_proc? */ 90 if (p_cansee(td->td_proc, proc) != 0 || 91 (pn->pn_vis != NULL && !(pn->pn_vis)(td, proc, pn))) 92 r = 0; 93 PROC_UNLOCK(proc); 94 } 95 PFS_RETURN (r); 96 } 97 98 /* 99 * Verify permissions 100 */ 101 static int 102 pfs_access(struct vop_access_args *va) 103 { 104 struct vnode *vn = va->a_vp; 105 struct vattr vattr; 106 int error; 107 108 PFS_TRACE((((struct pfs_vdata *)vn->v_data)->pvd_pn->pn_name)); 109 110 error = VOP_GETATTR(vn, &vattr, va->a_cred, va->a_td); 111 if (error) 112 PFS_RETURN (error); 113 error = vaccess(vn->v_type, vattr.va_mode, vattr.va_uid, 114 vattr.va_gid, va->a_mode, va->a_cred, NULL); 115 PFS_RETURN (error); 116 } 117 118 /* 119 * Close a file or directory 120 */ 121 static int 122 pfs_close(struct vop_close_args *va) 123 { 124 struct vnode *vn = va->a_vp; 125 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 126 struct pfs_node *pn = pvd->pvd_pn; 127 struct proc *proc; 128 int error; 129 130 PFS_TRACE((pn->pn_name)); 131 132 /* 133 * Do nothing unless this is the last close and the node has a 134 * last-close handler. 135 */ 136 if (vn->v_usecount > 1 || pn->pn_close == NULL) 137 PFS_RETURN (0); 138 139 if (pvd->pvd_pid != NO_PID) 140 proc = pfind(pvd->pvd_pid); 141 else 142 proc = NULL; 143 144 error = (pn->pn_close)(va->a_td, proc, pn); 145 146 if (proc != NULL) 147 PROC_UNLOCK(proc); 148 149 PFS_RETURN (error); 150 } 151 152 /* 153 * Get file attributes 154 */ 155 static int 156 pfs_getattr(struct vop_getattr_args *va) 157 { 158 struct vnode *vn = va->a_vp; 159 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 160 struct pfs_node *pn = pvd->pvd_pn; 161 struct vattr *vap = va->a_vap; 162 struct proc *proc; 163 int error = 0; 164 165 PFS_TRACE((pn->pn_name)); 166 167 VATTR_NULL(vap); 168 vap->va_type = vn->v_type; 169 vap->va_fileid = pn->pn_fileno; 170 vap->va_flags = 0; 171 vap->va_blocksize = PAGE_SIZE; 172 vap->va_bytes = vap->va_size = 0; 173 vap->va_fsid = vn->v_mount->mnt_stat.f_fsid.val[0]; 174 vap->va_nlink = 1; 175 nanotime(&vap->va_ctime); 176 vap->va_atime = vap->va_mtime = vap->va_ctime; 177 178 switch (pn->pn_type) { 179 case pfstype_procdir: 180 case pfstype_root: 181 case pfstype_dir: 182 vap->va_mode = 0555; 183 break; 184 case pfstype_file: 185 case pfstype_symlink: 186 vap->va_mode = 0444; 187 break; 188 default: 189 printf("shouldn't be here!\n"); 190 vap->va_mode = 0; 191 break; 192 } 193 194 if (pvd->pvd_pid != NO_PID) { 195 if ((proc = pfind(pvd->pvd_pid)) == NULL) 196 PFS_RETURN (ENOENT); 197 vap->va_uid = proc->p_ucred->cr_ruid; 198 vap->va_gid = proc->p_ucred->cr_rgid; 199 if (pn->pn_attr != NULL) 200 error = (pn->pn_attr)(va->a_td, proc, pn, vap); 201 PROC_UNLOCK(proc); 202 } else { 203 vap->va_uid = 0; 204 vap->va_gid = 0; 205 } 206 207 PFS_RETURN (error); 208 } 209 210 /* 211 * Perform an ioctl 212 */ 213 static int 214 pfs_ioctl(struct vop_ioctl_args *va) 215 { 216 struct vnode *vn = va->a_vp; 217 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 218 struct pfs_node *pn = pvd->pvd_pn; 219 struct proc *proc = NULL; 220 int error; 221 222 PFS_TRACE(("%s: %d", pn->pn_name, va->a_com)); 223 224 if (vn->v_type != VREG) 225 PFS_RETURN (EINVAL); 226 227 if (pn->pn_ioctl == NULL) 228 PFS_RETURN (ENOTTY); 229 230 /* 231 * This is necessary because either process' privileges may 232 * have changed since the open() call. 233 */ 234 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 235 PFS_RETURN (EIO); 236 237 /* XXX duplicates bits of pfs_visible() */ 238 if (pvd->pvd_pid != NO_PID) { 239 if ((proc = pfind(pvd->pvd_pid)) == NULL) 240 PFS_RETURN (EIO); 241 _PHOLD(proc); 242 PROC_UNLOCK(proc); 243 } 244 245 error = (pn->pn_ioctl)(curthread, proc, pn, va->a_command, va->a_data); 246 247 if (proc != NULL) 248 PRELE(proc); 249 250 PFS_RETURN (error); 251 } 252 253 /* 254 * Look up a file or directory 255 */ 256 static int 257 pfs_lookup(struct vop_lookup_args *va) 258 { 259 struct vnode *vn = va->a_dvp; 260 struct vnode **vpp = va->a_vpp; 261 struct componentname *cnp = va->a_cnp; 262 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 263 struct pfs_node *pd = pvd->pvd_pn; 264 struct pfs_node *pn, *pdn = NULL; 265 pid_t pid = pvd->pvd_pid; 266 char *pname; 267 int error, i, namelen; 268 269 PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr)); 270 271 if (vn->v_type != VDIR) 272 PFS_RETURN (ENOTDIR); 273 274 /* 275 * Don't support DELETE or RENAME. CREATE is supported so 276 * that O_CREAT will work, but the lookup will still fail if 277 * the file does not exist. 278 */ 279 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 280 PFS_RETURN (EOPNOTSUPP); 281 282 /* shortcut: check if the name is too long */ 283 if (cnp->cn_namelen >= PFS_NAMELEN) 284 PFS_RETURN (ENOENT); 285 286 /* check that parent directory is visisble... */ 287 if (!pfs_visible(curthread, pd, pvd->pvd_pid)) 288 PFS_RETURN (ENOENT); 289 290 /* self */ 291 namelen = cnp->cn_namelen; 292 pname = cnp->cn_nameptr; 293 if (namelen == 1 && *pname == '.') { 294 pn = pd; 295 *vpp = vn; 296 VREF(vn); 297 PFS_RETURN (0); 298 } 299 300 /* parent */ 301 if (cnp->cn_flags & ISDOTDOT) { 302 if (pd->pn_type == pfstype_root) 303 PFS_RETURN (EIO); 304 KASSERT(pd->pn_parent, ("non-root directory has no parent")); 305 /* 306 * This one is tricky. Descendents of procdir nodes 307 * inherit their parent's process affinity, but 308 * there's no easy reverse mapping. For simplicity, 309 * we assume that if this node is a procdir, its 310 * parent isn't (which is correct as long as 311 * descendents of procdir nodes are never procdir 312 * nodes themselves) 313 */ 314 if (pd->pn_type == pfstype_procdir) 315 pid = NO_PID; 316 pn = pd->pn_parent; 317 goto got_pnode; 318 } 319 320 /* named node */ 321 for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next) 322 if (pn->pn_type == pfstype_procdir) 323 pdn = pn; 324 else if (pn->pn_name[namelen] == '\0' 325 && bcmp(pname, pn->pn_name, namelen) == 0) 326 goto got_pnode; 327 328 /* process dependent node */ 329 if ((pn = pdn) != NULL) { 330 pid = 0; 331 for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i) 332 if ((pid = pid * 10 + pname[i] - '0') > PID_MAX) 333 break; 334 if (i == cnp->cn_namelen) 335 goto got_pnode; 336 } 337 338 PFS_RETURN (ENOENT); 339 got_pnode: 340 if (pn != pd->pn_parent && !pn->pn_parent) 341 pn->pn_parent = pd; 342 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 343 PFS_RETURN (ENOENT); 344 error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid); 345 if (error) 346 PFS_RETURN (error); 347 if (cnp->cn_flags & MAKEENTRY) 348 cache_enter(vn, *vpp, cnp); 349 PFS_RETURN (0); 350 } 351 352 /* 353 * Open a file or directory. 354 */ 355 static int 356 pfs_open(struct vop_open_args *va) 357 { 358 struct vnode *vn = va->a_vp; 359 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 360 struct pfs_node *pn = pvd->pvd_pn; 361 int mode = va->a_mode; 362 363 PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode)); 364 365 /* 366 * check if the file is visible to the caller 367 * 368 * XXX Not sure if this is necessary, as the VFS system calls 369 * XXX pfs_lookup() and pfs_access() first, and pfs_lookup() 370 * XXX calls pfs_visible(). There's a race condition here, but 371 * XXX calling pfs_visible() from here doesn't really close it, 372 * XXX and the only consequence of that race is an EIO further 373 * XXX down the line. 374 */ 375 if (!pfs_visible(va->a_td, pn, pvd->pvd_pid)) 376 PFS_RETURN (ENOENT); 377 378 /* check if the requested mode is permitted */ 379 if (((mode & FREAD) && !(mode & PFS_RD)) || 380 ((mode & FWRITE) && !(mode & PFS_WR))) 381 PFS_RETURN (EPERM); 382 383 /* we don't support locking */ 384 if ((mode & O_SHLOCK) || (mode & O_EXLOCK)) 385 PFS_RETURN (EOPNOTSUPP); 386 387 PFS_RETURN (0); 388 } 389 390 /* 391 * Read from a file 392 */ 393 static int 394 pfs_read(struct vop_read_args *va) 395 { 396 struct vnode *vn = va->a_vp; 397 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 398 struct pfs_node *pn = pvd->pvd_pn; 399 struct uio *uio = va->a_uio; 400 struct proc *proc = NULL; 401 struct sbuf *sb = NULL; 402 char *ps; 403 int error, xlen; 404 405 PFS_TRACE((pn->pn_name)); 406 407 if (vn->v_type != VREG) 408 PFS_RETURN (EINVAL); 409 410 if (!(pn->pn_flags & PFS_RD)) 411 PFS_RETURN (EBADF); 412 413 if (pn->pn_func == NULL) 414 PFS_RETURN (EIO); 415 416 /* 417 * This is necessary because either process' privileges may 418 * have changed since the open() call. 419 */ 420 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 421 PFS_RETURN (EIO); 422 423 /* XXX duplicates bits of pfs_visible() */ 424 if (pvd->pvd_pid != NO_PID) { 425 if ((proc = pfind(pvd->pvd_pid)) == NULL) 426 PFS_RETURN (EIO); 427 _PHOLD(proc); 428 PROC_UNLOCK(proc); 429 } 430 431 if (pn->pn_flags & PFS_RAWRD) { 432 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 433 if (proc != NULL) 434 PRELE(proc); 435 PFS_RETURN (error); 436 } 437 438 sb = sbuf_new(sb, NULL, uio->uio_offset + uio->uio_resid, 0); 439 if (sb == NULL) { 440 if (proc != NULL) 441 PRELE(proc); 442 PFS_RETURN (EIO); 443 } 444 445 error = (pn->pn_func)(curthread, proc, pn, sb, uio); 446 447 if (proc != NULL) 448 PRELE(proc); 449 450 if (error) { 451 sbuf_delete(sb); 452 PFS_RETURN (error); 453 } 454 455 /* XXX we should possibly detect and handle overflows */ 456 sbuf_finish(sb); 457 ps = sbuf_data(sb) + uio->uio_offset; 458 xlen = sbuf_len(sb) - uio->uio_offset; 459 xlen = imin(xlen, uio->uio_resid); 460 error = (xlen <= 0 ? 0 : uiomove(ps, xlen, uio)); 461 sbuf_delete(sb); 462 PFS_RETURN (error); 463 } 464 465 /* 466 * Iterate through directory entries 467 */ 468 static int 469 pfs_iterate(struct thread *td, pid_t pid, struct pfs_node *pd, 470 struct pfs_node **pn, struct proc **p) 471 { 472 if ((*pn) == NULL) 473 *pn = pd->pn_nodes; 474 else 475 again: 476 if ((*pn)->pn_type != pfstype_procdir) 477 *pn = (*pn)->pn_next; 478 479 while (*pn != NULL && (*pn)->pn_type == pfstype_procdir) { 480 if (*p == NULL) 481 *p = LIST_FIRST(&allproc); 482 else 483 *p = LIST_NEXT(*p, p_list); 484 if (*p != NULL) 485 break; 486 *pn = (*pn)->pn_next; 487 } 488 489 if ((*pn) == NULL) 490 return (-1); 491 492 if (!pfs_visible(td, *pn, *p ? (*p)->p_pid : pid)) 493 goto again; 494 495 return (0); 496 } 497 498 /* 499 * Return directory entries. 500 */ 501 static int 502 pfs_readdir(struct vop_readdir_args *va) 503 { 504 struct vnode *vn = va->a_vp; 505 struct pfs_info *pi = (struct pfs_info *)vn->v_mount->mnt_data; 506 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 507 struct pfs_node *pd = pvd->pvd_pn; 508 pid_t pid = pvd->pvd_pid; 509 struct pfs_node *pn; 510 struct dirent entry; 511 struct uio *uio; 512 struct proc *p; 513 off_t offset; 514 int error, i, resid; 515 516 PFS_TRACE((pd->pn_name)); 517 518 if (vn->v_type != VDIR) 519 PFS_RETURN (ENOTDIR); 520 uio = va->a_uio; 521 522 /* check if the directory is visible to the caller */ 523 if (!pfs_visible(curthread, pd, pid)) 524 PFS_RETURN (ENOENT); 525 526 /* only allow reading entire entries */ 527 offset = uio->uio_offset; 528 resid = uio->uio_resid; 529 if (offset < 0 || offset % PFS_DELEN != 0 || resid < PFS_DELEN) 530 PFS_RETURN (EINVAL); 531 532 /* skip unwanted entries */ 533 sx_slock(&allproc_lock); 534 for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) 535 if (pfs_iterate(curthread, pid, pd, &pn, &p) == -1) { 536 /* nothing left... */ 537 sx_sunlock(&allproc_lock); 538 PFS_RETURN (0); 539 } 540 541 /* fill in entries */ 542 entry.d_reclen = PFS_DELEN; 543 while (pfs_iterate(curthread, pid, pd, &pn, &p) != -1 && resid > 0) { 544 if (!pn->pn_parent) 545 pn->pn_parent = pd; 546 if (!pn->pn_fileno) 547 pfs_fileno_alloc(pi, pn); 548 if (pid != NO_PID) 549 entry.d_fileno = pn->pn_fileno * NO_PID + pid; 550 else 551 entry.d_fileno = pn->pn_fileno; 552 /* PFS_DELEN was picked to fit PFS_NAMLEN */ 553 for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i) 554 entry.d_name[i] = pn->pn_name[i]; 555 entry.d_name[i] = 0; 556 entry.d_namlen = i; 557 switch (pn->pn_type) { 558 case pfstype_procdir: 559 KASSERT(p != NULL, 560 ("reached procdir node with p == NULL")); 561 entry.d_fileno = pn->pn_fileno * NO_PID + p->p_pid; 562 entry.d_namlen = snprintf(entry.d_name, 563 PFS_NAMELEN, "%d", p->p_pid); 564 /* fall through */ 565 case pfstype_root: 566 case pfstype_dir: 567 case pfstype_this: 568 case pfstype_parent: 569 entry.d_type = DT_DIR; 570 break; 571 case pfstype_file: 572 entry.d_type = DT_REG; 573 break; 574 case pfstype_symlink: 575 entry.d_type = DT_LNK; 576 break; 577 default: 578 sx_sunlock(&allproc_lock); 579 panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type); 580 } 581 PFS_TRACE((entry.d_name)); 582 if ((error = uiomove((caddr_t)&entry, PFS_DELEN, uio))) { 583 sx_sunlock(&allproc_lock); 584 PFS_RETURN (error); 585 } 586 offset += PFS_DELEN; 587 resid -= PFS_DELEN; 588 } 589 590 sx_sunlock(&allproc_lock); 591 uio->uio_offset += offset; 592 PFS_RETURN (0); 593 } 594 595 /* 596 * Read a symbolic link 597 */ 598 static int 599 pfs_readlink(struct vop_readlink_args *va) 600 { 601 struct vnode *vn = va->a_vp; 602 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 603 struct pfs_node *pn = pvd->pvd_pn; 604 struct uio *uio = va->a_uio; 605 struct proc *proc = NULL; 606 char buf[MAXPATHLEN], *ps; 607 struct sbuf sb; 608 int error, xlen; 609 610 PFS_TRACE((pn->pn_name)); 611 612 if (vn->v_type != VLNK) 613 PFS_RETURN (EINVAL); 614 615 if (pn->pn_func == NULL) 616 PFS_RETURN (EIO); 617 618 if (pvd->pvd_pid != NO_PID) { 619 if ((proc = pfind(pvd->pvd_pid)) == NULL) 620 PFS_RETURN (EIO); 621 _PHOLD(proc); 622 PROC_UNLOCK(proc); 623 } 624 625 /* sbuf_new() can't fail with a static buffer */ 626 sbuf_new(&sb, buf, sizeof buf, 0); 627 628 error = (pn->pn_func)(curthread, proc, pn, &sb, NULL); 629 630 if (proc != NULL) 631 PRELE(proc); 632 633 if (error) { 634 sbuf_delete(&sb); 635 PFS_RETURN (error); 636 } 637 638 /* XXX we should detect and handle overflows */ 639 sbuf_finish(&sb); 640 ps = sbuf_data(&sb) + uio->uio_offset; 641 xlen = sbuf_len(&sb) - uio->uio_offset; 642 xlen = imin(xlen, uio->uio_resid); 643 error = (xlen <= 0 ? 0 : uiomove(ps, xlen, uio)); 644 sbuf_delete(&sb); 645 PFS_RETURN (error); 646 } 647 648 /* 649 * Reclaim a vnode 650 */ 651 static int 652 pfs_reclaim(struct vop_reclaim_args *va) 653 { 654 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 655 656 return (pfs_vncache_free(va->a_vp)); 657 } 658 659 /* 660 * Set attributes 661 */ 662 static int 663 pfs_setattr(struct vop_setattr_args *va) 664 { 665 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 666 667 if (va->a_vap->va_flags != (u_long)VNOVAL) 668 PFS_RETURN (EOPNOTSUPP); 669 /* XXX it's a bit more complex than that, really... */ 670 PFS_RETURN (0); 671 } 672 673 /* 674 * Read from a file 675 */ 676 static int 677 pfs_write(struct vop_read_args *va) 678 { 679 struct vnode *vn = va->a_vp; 680 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 681 struct pfs_node *pn = pvd->pvd_pn; 682 struct uio *uio = va->a_uio; 683 struct proc *proc = NULL; 684 struct sbuf sb; 685 int error; 686 687 PFS_TRACE((pn->pn_name)); 688 689 if (vn->v_type != VREG) 690 PFS_RETURN (EINVAL); 691 692 if (!(pn->pn_flags & PFS_WR)) 693 PFS_RETURN (EBADF); 694 695 if (pn->pn_func == NULL) 696 PFS_RETURN (EIO); 697 698 /* 699 * This is necessary because either process' privileges may 700 * have changed since the open() call. 701 */ 702 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 703 PFS_RETURN (EIO); 704 705 /* XXX duplicates bits of pfs_visible() */ 706 if (pvd->pvd_pid != NO_PID) { 707 if ((proc = pfind(pvd->pvd_pid)) == NULL) 708 PFS_RETURN (EIO); 709 _PHOLD(proc); 710 PROC_UNLOCK(proc); 711 } 712 713 if (pn->pn_flags & PFS_RAWWR) { 714 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 715 if (proc != NULL) 716 PRELE(proc); 717 PFS_RETURN (error); 718 } 719 720 sbuf_uionew(&sb, uio, &error); 721 if (error) 722 PFS_RETURN (error); 723 724 error = (pn->pn_func)(curthread, proc, pn, &sb, uio); 725 726 if (proc != NULL) 727 PRELE(proc); 728 729 sbuf_delete(&sb); 730 PFS_RETURN (error); 731 } 732 733 /* 734 * Dummy operations */ 735 static int pfs_badop(void *va) { return (EOPNOTSUPP); } 736 #if 0 737 static int pfs_erofs(void *va) { return (EROFS); } 738 static int pfs_null(void *va) { return (0); } 739 #endif 740 741 /* 742 * Vnode operations 743 */ 744 vop_t **pfs_vnodeop_p; 745 static struct vnodeopv_entry_desc pfs_vnodeop_entries[] = { 746 { &vop_default_desc, (vop_t *)vop_defaultop }, 747 { &vop_access_desc, (vop_t *)pfs_access }, 748 { &vop_close_desc, (vop_t *)pfs_close }, 749 { &vop_create_desc, (vop_t *)pfs_badop }, 750 { &vop_getattr_desc, (vop_t *)pfs_getattr }, 751 { &vop_ioctl_desc, (vop_t *)pfs_ioctl }, 752 { &vop_link_desc, (vop_t *)pfs_badop }, 753 { &vop_lookup_desc, (vop_t *)pfs_lookup }, 754 { &vop_mkdir_desc, (vop_t *)pfs_badop }, 755 { &vop_mknod_desc, (vop_t *)pfs_badop }, 756 { &vop_open_desc, (vop_t *)pfs_open }, 757 { &vop_read_desc, (vop_t *)pfs_read }, 758 { &vop_readdir_desc, (vop_t *)pfs_readdir }, 759 { &vop_readlink_desc, (vop_t *)pfs_readlink }, 760 { &vop_reclaim_desc, (vop_t *)pfs_reclaim }, 761 { &vop_remove_desc, (vop_t *)pfs_badop }, 762 { &vop_rename_desc, (vop_t *)pfs_badop }, 763 { &vop_rmdir_desc, (vop_t *)pfs_badop }, 764 { &vop_setattr_desc, (vop_t *)pfs_setattr }, 765 { &vop_symlink_desc, (vop_t *)pfs_badop }, 766 { &vop_write_desc, (vop_t *)pfs_write }, 767 /* XXX I've probably forgotten a few that need pfs_badop */ 768 { NULL, (vop_t *)NULL } 769 }; 770 771 static struct vnodeopv_desc pfs_vnodeop_opv_desc = 772 { &pfs_vnodeop_p, pfs_vnodeop_entries }; 773 774 VNODEOP_SET(pfs_vnodeop_opv_desc); 775