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sys/fs/pseudofs/pseudofs_vnops.c
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1 /*- 2 * Copyright (c) 2001 Dag-Erling Coïdan Smørgrav 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: releng/5.0/sys/fs/pseudofs/pseudofs_vnops.c 120979 2003-10-10 20:15:49Z nectar $ 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 #include <machine/limits.h> 47 48 #include <fs/pseudofs/pseudofs.h> 49 #include <fs/pseudofs/pseudofs_internal.h> 50 51 #if 0 52 #define PFS_TRACE(foo) \ 53 do { \ 54 printf("pseudofs: %s(): line %d: ", __func__, __LINE__); \ 55 printf foo ; \ 56 printf("\n"); \ 57 } while (0) 58 #define PFS_RETURN(err) \ 59 do { \ 60 printf("pseudofs: %s(): line %d: returning %d\n", \ 61 __func__, __LINE__, err); \ 62 return (err); \ 63 } while (0) 64 #else 65 #define PFS_TRACE(foo) \ 66 do { /* nothing */ } while (0) 67 #define PFS_RETURN(err) \ 68 return (err) 69 #endif 70 71 /* 72 * Returns non-zero if given file is visible to given process 73 */ 74 static int 75 pfs_visible(struct thread *td, struct pfs_node *pn, pid_t pid) 76 { 77 struct proc *proc; 78 int r; 79 80 PFS_TRACE(("%s (pid: %d, req: %d)", 81 pn->pn_name, pid, td->td_proc->p_pid)); 82 83 if (pn->pn_flags & PFS_DISABLED) 84 PFS_RETURN (0); 85 86 r = 1; 87 if (pid != NO_PID) { 88 if ((proc = pfind(pid)) == NULL) 89 PFS_RETURN (0); 90 if (p_cansee(td, 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 (vrefcnt(vn) > 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: %lx", pn->pn_name, va->a_command)); 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 * Perform getextattr 255 */ 256 static int 257 pfs_getextattr(struct vop_getextattr_args *va) 258 { 259 struct vnode *vn = va->a_vp; 260 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 261 struct pfs_node *pn = pvd->pvd_pn; 262 struct proc *proc = NULL; 263 int error; 264 265 PFS_TRACE((pd->pn_name)); 266 267 if (pn->pn_getextattr == NULL) 268 PFS_RETURN (EOPNOTSUPP); 269 270 /* 271 * This is necessary because either process' privileges may 272 * have changed since the open() call. 273 */ 274 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 275 PFS_RETURN (EIO); 276 277 /* XXX duplicates bits of pfs_visible() */ 278 if (pvd->pvd_pid != NO_PID) { 279 if ((proc = pfind(pvd->pvd_pid)) == NULL) 280 PFS_RETURN (EIO); 281 _PHOLD(proc); 282 PROC_UNLOCK(proc); 283 } 284 285 error = (pn->pn_getextattr)(curthread, proc, pn, va->a_attrnamespace, 286 va->a_name, va->a_uio, va->a_size, va->a_cred); 287 288 if (proc != NULL) 289 PRELE(proc); 290 291 PFS_RETURN (error); 292 } 293 294 /* 295 * Look up a file or directory 296 * 297 * XXX NOTE! pfs_lookup() has been hooked into vop_lookup_desc! This 298 * will result in a lookup operation for a vnode which may already be 299 * cached, therefore we have to be careful to purge the VFS cache when 300 * reusing a vnode. 301 * 302 * This code will work, but is not really correct. Normally we would hook 303 * vfs_cache_lookup() into vop_lookup_desc and hook pfs_lookup() into 304 * vop_cachedlookup_desc. 305 */ 306 static int 307 pfs_lookup(struct vop_lookup_args *va) 308 { 309 struct vnode *vn = va->a_dvp; 310 struct vnode **vpp = va->a_vpp; 311 struct componentname *cnp = va->a_cnp; 312 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 313 struct pfs_node *pd = pvd->pvd_pn; 314 struct pfs_node *pn, *pdn = NULL; 315 pid_t pid = pvd->pvd_pid; 316 int lockparent; 317 int wantparent; 318 char *pname; 319 int error, i, namelen; 320 321 PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr)); 322 323 cnp->cn_flags &= ~PDIRUNLOCK; 324 325 if (vn->v_type != VDIR) 326 PFS_RETURN (ENOTDIR); 327 328 /* 329 * Don't support DELETE or RENAME. CREATE is supported so 330 * that O_CREAT will work, but the lookup will still fail if 331 * the file does not exist. 332 */ 333 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 334 PFS_RETURN (EOPNOTSUPP); 335 336 /* shortcut: check if the name is too long */ 337 if (cnp->cn_namelen >= PFS_NAMELEN) 338 PFS_RETURN (ENOENT); 339 340 /* check that parent directory is visisble... */ 341 if (!pfs_visible(curthread, pd, pvd->pvd_pid)) 342 PFS_RETURN (ENOENT); 343 344 lockparent = cnp->cn_flags & LOCKPARENT; 345 wantparent = cnp->cn_flags & (LOCKPARENT | WANTPARENT); 346 347 348 /* self */ 349 namelen = cnp->cn_namelen; 350 pname = cnp->cn_nameptr; 351 if (namelen == 1 && *pname == '.') { 352 pn = pd; 353 *vpp = vn; 354 VREF(vn); 355 PFS_RETURN (0); 356 } 357 358 /* parent */ 359 if (cnp->cn_flags & ISDOTDOT) { 360 if (pd->pn_type == pfstype_root) 361 PFS_RETURN (EIO); 362 VOP_UNLOCK(vn, 0, cnp->cn_thread); 363 cnp->cn_flags |= PDIRUNLOCK; 364 365 KASSERT(pd->pn_parent, ("non-root directory has no parent")); 366 /* 367 * This one is tricky. Descendents of procdir nodes 368 * inherit their parent's process affinity, but 369 * there's no easy reverse mapping. For simplicity, 370 * we assume that if this node is a procdir, its 371 * parent isn't (which is correct as long as 372 * descendents of procdir nodes are never procdir 373 * nodes themselves) 374 */ 375 if (pd->pn_type == pfstype_procdir) 376 pid = NO_PID; 377 pn = pd->pn_parent; 378 goto got_pnode; 379 } 380 381 /* named node */ 382 for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next) 383 if (pn->pn_type == pfstype_procdir) 384 pdn = pn; 385 else if (pn->pn_name[namelen] == '\0' 386 && bcmp(pname, pn->pn_name, namelen) == 0) 387 goto got_pnode; 388 389 /* process dependent node */ 390 if ((pn = pdn) != NULL) { 391 pid = 0; 392 for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i) 393 if ((pid = pid * 10 + pname[i] - '') > PID_MAX) 394 break; 395 if (i == cnp->cn_namelen) 396 goto got_pnode; 397 } 398 399 PFS_RETURN (ENOENT); 400 got_pnode: 401 if (pn != pd->pn_parent && !pn->pn_parent) 402 pn->pn_parent = pd; 403 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 404 PFS_RETURN (ENOENT); 405 406 error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid); 407 if (error) 408 PFS_RETURN (error); 409 410 if ((cnp->cn_flags & ISDOTDOT) && (cnp->cn_flags & ISLASTCN) 411 && lockparent) { 412 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 413 cnp->cn_flags &= ~PDIRUNLOCK; 414 } 415 if (!lockparent || !(cnp->cn_flags & ISLASTCN)) 416 VOP_UNLOCK(vn, 0, cnp->cn_thread); 417 418 /* 419 * XXX See comment at top of the routine. 420 */ 421 if (cnp->cn_flags & MAKEENTRY) 422 cache_enter(vn, *vpp, cnp); 423 PFS_RETURN (0); 424 } 425 426 /* 427 * Open a file or directory. 428 */ 429 static int 430 pfs_open(struct vop_open_args *va) 431 { 432 struct vnode *vn = va->a_vp; 433 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 434 struct pfs_node *pn = pvd->pvd_pn; 435 int mode = va->a_mode; 436 437 PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode)); 438 439 /* 440 * check if the file is visible to the caller 441 * 442 * XXX Not sure if this is necessary, as the VFS system calls 443 * XXX pfs_lookup() and pfs_access() first, and pfs_lookup() 444 * XXX calls pfs_visible(). There's a race condition here, but 445 * XXX calling pfs_visible() from here doesn't really close it, 446 * XXX and the only consequence of that race is an EIO further 447 * XXX down the line. 448 */ 449 if (!pfs_visible(va->a_td, pn, pvd->pvd_pid)) 450 PFS_RETURN (ENOENT); 451 452 /* check if the requested mode is permitted */ 453 if (((mode & FREAD) && !(mode & PFS_RD)) || 454 ((mode & FWRITE) && !(mode & PFS_WR))) 455 PFS_RETURN (EPERM); 456 457 /* we don't support locking */ 458 if ((mode & O_SHLOCK) || (mode & O_EXLOCK)) 459 PFS_RETURN (EOPNOTSUPP); 460 461 PFS_RETURN (0); 462 } 463 464 /* 465 * Read from a file 466 */ 467 static int 468 pfs_read(struct vop_read_args *va) 469 { 470 struct vnode *vn = va->a_vp; 471 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 472 struct pfs_node *pn = pvd->pvd_pn; 473 struct uio *uio = va->a_uio; 474 struct proc *proc = NULL; 475 struct sbuf *sb = NULL; 476 int error; 477 unsigned int buflen, offset, resid; 478 479 PFS_TRACE((pn->pn_name)); 480 481 if (vn->v_type != VREG) 482 PFS_RETURN (EINVAL); 483 484 if (!(pn->pn_flags & PFS_RD)) 485 PFS_RETURN (EBADF); 486 487 if (pn->pn_func == NULL) 488 PFS_RETURN (EIO); 489 490 /* 491 * This is necessary because either process' privileges may 492 * have changed since the open() call. 493 */ 494 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 495 PFS_RETURN (EIO); 496 497 /* XXX duplicates bits of pfs_visible() */ 498 if (pvd->pvd_pid != NO_PID) { 499 if ((proc = pfind(pvd->pvd_pid)) == NULL) 500 PFS_RETURN (EIO); 501 _PHOLD(proc); 502 PROC_UNLOCK(proc); 503 } 504 505 if (pn->pn_flags & PFS_RAWRD) { 506 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 507 if (proc != NULL) 508 PRELE(proc); 509 PFS_RETURN (error); 510 } 511 512 /* Beaucoup sanity checks so we don't ask for bogus allocation. */ 513 if (uio->uio_offset < 0 || uio->uio_resid < 0 || 514 (offset = uio->uio_offset) != uio->uio_offset || 515 (resid = uio->uio_resid) != uio->uio_resid || 516 (buflen = offset + resid) < offset || buflen > INT_MAX) { 517 if (proc != NULL) 518 PRELE(proc); 519 PFS_RETURN (EINVAL); 520 } 521 sb = sbuf_new(sb, NULL, buflen, 0); 522 if (sb == NULL) { 523 if (proc != NULL) 524 PRELE(proc); 525 PFS_RETURN (EIO); 526 } 527 528 error = (pn->pn_func)(curthread, proc, pn, sb, uio); 529 530 if (proc != NULL) 531 PRELE(proc); 532 533 if (error) { 534 sbuf_delete(sb); 535 PFS_RETURN (error); 536 } 537 538 sbuf_finish(sb); 539 error = uiomove_frombuf(sbuf_data(sb), sbuf_len(sb), uio); 540 sbuf_delete(sb); 541 PFS_RETURN (error); 542 } 543 544 /* 545 * Iterate through directory entries 546 */ 547 static int 548 pfs_iterate(struct thread *td, pid_t pid, struct pfs_node *pd, 549 struct pfs_node **pn, struct proc **p) 550 { 551 if ((*pn) == NULL) 552 *pn = pd->pn_nodes; 553 else 554 again: 555 if ((*pn)->pn_type != pfstype_procdir) 556 *pn = (*pn)->pn_next; 557 558 while (*pn != NULL && (*pn)->pn_type == pfstype_procdir) { 559 if (*p == NULL) 560 *p = LIST_FIRST(&allproc); 561 else 562 *p = LIST_NEXT(*p, p_list); 563 if (*p != NULL) 564 break; 565 *pn = (*pn)->pn_next; 566 } 567 568 if ((*pn) == NULL) 569 return (-1); 570 571 if (!pfs_visible(td, *pn, *p ? (*p)->p_pid : pid)) 572 goto again; 573 574 return (0); 575 } 576 577 /* 578 * Return directory entries. 579 */ 580 static int 581 pfs_readdir(struct vop_readdir_args *va) 582 { 583 struct vnode *vn = va->a_vp; 584 struct pfs_info *pi = (struct pfs_info *)vn->v_mount->mnt_data; 585 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 586 struct pfs_node *pd = pvd->pvd_pn; 587 pid_t pid = pvd->pvd_pid; 588 struct pfs_node *pn; 589 struct dirent entry; 590 struct uio *uio; 591 struct proc *p; 592 off_t offset; 593 int error, i, resid; 594 595 PFS_TRACE((pd->pn_name)); 596 597 if (vn->v_type != VDIR) 598 PFS_RETURN (ENOTDIR); 599 uio = va->a_uio; 600 601 /* check if the directory is visible to the caller */ 602 if (!pfs_visible(curthread, pd, pid)) 603 PFS_RETURN (ENOENT); 604 605 /* only allow reading entire entries */ 606 offset = uio->uio_offset; 607 resid = uio->uio_resid; 608 if (offset < 0 || offset % PFS_DELEN != 0 || resid < PFS_DELEN) 609 PFS_RETURN (EINVAL); 610 611 /* skip unwanted entries */ 612 sx_slock(&allproc_lock); 613 for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) 614 if (pfs_iterate(curthread, pid, pd, &pn, &p) == -1) { 615 /* nothing left... */ 616 sx_sunlock(&allproc_lock); 617 PFS_RETURN (0); 618 } 619 620 /* fill in entries */ 621 entry.d_reclen = PFS_DELEN; 622 while (pfs_iterate(curthread, pid, pd, &pn, &p) != -1 && resid > 0) { 623 if (!pn->pn_parent) 624 pn->pn_parent = pd; 625 if (!pn->pn_fileno) 626 pfs_fileno_alloc(pi, pn); 627 if (pid != NO_PID) 628 entry.d_fileno = pn->pn_fileno * NO_PID + pid; 629 else 630 entry.d_fileno = pn->pn_fileno; 631 /* PFS_DELEN was picked to fit PFS_NAMLEN */ 632 for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i) 633 entry.d_name[i] = pn->pn_name[i]; 634 entry.d_name[i] = 0; 635 entry.d_namlen = i; 636 switch (pn->pn_type) { 637 case pfstype_procdir: 638 KASSERT(p != NULL, 639 ("reached procdir node with p == NULL")); 640 entry.d_fileno = pn->pn_fileno * NO_PID + p->p_pid; 641 entry.d_namlen = snprintf(entry.d_name, 642 PFS_NAMELEN, "%d", p->p_pid); 643 /* fall through */ 644 case pfstype_root: 645 case pfstype_dir: 646 case pfstype_this: 647 case pfstype_parent: 648 entry.d_type = DT_DIR; 649 break; 650 case pfstype_file: 651 entry.d_type = DT_REG; 652 break; 653 case pfstype_symlink: 654 entry.d_type = DT_LNK; 655 break; 656 default: 657 sx_sunlock(&allproc_lock); 658 panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type); 659 } 660 PFS_TRACE((entry.d_name)); 661 if ((error = uiomove((caddr_t)&entry, PFS_DELEN, uio))) { 662 sx_sunlock(&allproc_lock); 663 PFS_RETURN (error); 664 } 665 offset += PFS_DELEN; 666 resid -= PFS_DELEN; 667 } 668 669 sx_sunlock(&allproc_lock); 670 uio->uio_offset += offset; 671 PFS_RETURN (0); 672 } 673 674 /* 675 * Read a symbolic link 676 */ 677 static int 678 pfs_readlink(struct vop_readlink_args *va) 679 { 680 struct vnode *vn = va->a_vp; 681 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 682 struct pfs_node *pn = pvd->pvd_pn; 683 struct uio *uio = va->a_uio; 684 struct proc *proc = NULL; 685 char buf[MAXPATHLEN]; 686 struct sbuf sb; 687 int error; 688 689 PFS_TRACE((pn->pn_name)); 690 691 if (vn->v_type != VLNK) 692 PFS_RETURN (EINVAL); 693 694 if (pn->pn_func == NULL) 695 PFS_RETURN (EIO); 696 697 if (pvd->pvd_pid != NO_PID) { 698 if ((proc = pfind(pvd->pvd_pid)) == NULL) 699 PFS_RETURN (EIO); 700 _PHOLD(proc); 701 PROC_UNLOCK(proc); 702 } 703 704 /* sbuf_new() can't fail with a static buffer */ 705 sbuf_new(&sb, buf, sizeof buf, 0); 706 707 error = (pn->pn_func)(curthread, proc, pn, &sb, NULL); 708 709 if (proc != NULL) 710 PRELE(proc); 711 712 if (error) { 713 sbuf_delete(&sb); 714 PFS_RETURN (error); 715 } 716 717 sbuf_finish(&sb); 718 error = uiomove_frombuf(sbuf_data(&sb), sbuf_len(&sb), uio); 719 sbuf_delete(&sb); 720 PFS_RETURN (error); 721 } 722 723 /* 724 * Reclaim a vnode 725 */ 726 static int 727 pfs_reclaim(struct vop_reclaim_args *va) 728 { 729 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 730 731 return (pfs_vncache_free(va->a_vp)); 732 } 733 734 /* 735 * Set attributes 736 */ 737 static int 738 pfs_setattr(struct vop_setattr_args *va) 739 { 740 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 741 742 PFS_RETURN (EOPNOTSUPP); 743 } 744 745 /* 746 * Read from a file 747 */ 748 static int 749 pfs_write(struct vop_read_args *va) 750 { 751 struct vnode *vn = va->a_vp; 752 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 753 struct pfs_node *pn = pvd->pvd_pn; 754 struct uio *uio = va->a_uio; 755 struct proc *proc = NULL; 756 struct sbuf sb; 757 int error; 758 759 PFS_TRACE((pn->pn_name)); 760 761 if (vn->v_type != VREG) 762 PFS_RETURN (EINVAL); 763 764 if (!(pn->pn_flags & PFS_WR)) 765 PFS_RETURN (EBADF); 766 767 if (pn->pn_func == NULL) 768 PFS_RETURN (EIO); 769 770 /* 771 * This is necessary because either process' privileges may 772 * have changed since the open() call. 773 */ 774 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 775 PFS_RETURN (EIO); 776 777 /* XXX duplicates bits of pfs_visible() */ 778 if (pvd->pvd_pid != NO_PID) { 779 if ((proc = pfind(pvd->pvd_pid)) == NULL) 780 PFS_RETURN (EIO); 781 _PHOLD(proc); 782 PROC_UNLOCK(proc); 783 } 784 785 if (pn->pn_flags & PFS_RAWWR) { 786 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 787 if (proc != NULL) 788 PRELE(proc); 789 PFS_RETURN (error); 790 } 791 792 sbuf_uionew(&sb, uio, &error); 793 if (error) 794 PFS_RETURN (error); 795 796 error = (pn->pn_func)(curthread, proc, pn, &sb, uio); 797 798 if (proc != NULL) 799 PRELE(proc); 800 801 sbuf_delete(&sb); 802 PFS_RETURN (error); 803 } 804 805 /* 806 * Vnode operations 807 */ 808 vop_t **pfs_vnodeop_p; 809 static struct vnodeopv_entry_desc pfs_vnodeop_entries[] = { 810 { &vop_default_desc, (vop_t *)vop_defaultop }, 811 { &vop_access_desc, (vop_t *)pfs_access }, 812 { &vop_close_desc, (vop_t *)pfs_close }, 813 { &vop_create_desc, (vop_t *)vop_eopnotsupp }, 814 { &vop_getattr_desc, (vop_t *)pfs_getattr }, 815 { &vop_getextattr_desc, (vop_t *)pfs_getextattr }, 816 { &vop_ioctl_desc, (vop_t *)pfs_ioctl }, 817 { &vop_link_desc, (vop_t *)vop_eopnotsupp }, 818 { &vop_lookup_desc, (vop_t *)pfs_lookup }, 819 { &vop_mkdir_desc, (vop_t *)vop_eopnotsupp }, 820 { &vop_mknod_desc, (vop_t *)vop_eopnotsupp }, 821 { &vop_open_desc, (vop_t *)pfs_open }, 822 { &vop_read_desc, (vop_t *)pfs_read }, 823 { &vop_readdir_desc, (vop_t *)pfs_readdir }, 824 { &vop_readlink_desc, (vop_t *)pfs_readlink }, 825 { &vop_reclaim_desc, (vop_t *)pfs_reclaim }, 826 #ifdef MAC 827 { &vop_refreshlabel_desc, (vop_t *)pfs_refreshlabel }, 828 #endif 829 { &vop_remove_desc, (vop_t *)vop_eopnotsupp }, 830 { &vop_rename_desc, (vop_t *)vop_eopnotsupp }, 831 { &vop_rmdir_desc, (vop_t *)vop_eopnotsupp }, 832 { &vop_setattr_desc, (vop_t *)pfs_setattr }, 833 { &vop_symlink_desc, (vop_t *)vop_eopnotsupp }, 834 { &vop_write_desc, (vop_t *)pfs_write }, 835 { &vop_lock_desc, (vop_t *)vop_stdlock }, 836 { &vop_unlock_desc, (vop_t *)vop_stdunlock }, 837 { &vop_islocked_desc, (vop_t *)vop_stdislocked}, 838 /* XXX I've probably forgotten a few that need vop_eopnotsupp */ 839 { NULL, (vop_t *)NULL } 840 }; 841 842 static struct vnodeopv_desc pfs_vnodeop_opv_desc = 843 { &pfs_vnodeop_p, pfs_vnodeop_entries }; 844 845 VNODEOP_SET(pfs_vnodeop_opv_desc);
Cache object: f97c9aa6a86bba21bb74a02b1bcea8b9
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