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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/5.2/sys/fs/pseudofs/pseudofs_vnops.c 125672 2004-02-10 21:08:01Z 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/limits.h> 38 #include <sys/lock.h> 39 #include <sys/mount.h> 40 #include <sys/mutex.h> 41 #include <sys/namei.h> 42 #include <sys/proc.h> 43 #include <sys/sbuf.h> 44 #include <sys/sx.h> 45 #include <sys/sysctl.h> 46 #include <sys/vnode.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 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 168 PFS_RETURN (ENOENT); 169 170 VATTR_NULL(vap); 171 vap->va_type = vn->v_type; 172 vap->va_fileid = pn->pn_fileno; 173 vap->va_flags = 0; 174 vap->va_blocksize = PAGE_SIZE; 175 vap->va_bytes = vap->va_size = 0; 176 vap->va_fsid = vn->v_mount->mnt_stat.f_fsid.val[0]; 177 vap->va_nlink = 1; 178 nanotime(&vap->va_ctime); 179 vap->va_atime = vap->va_mtime = vap->va_ctime; 180 181 switch (pn->pn_type) { 182 case pfstype_procdir: 183 case pfstype_root: 184 case pfstype_dir: 185 vap->va_mode = 0555; 186 break; 187 case pfstype_file: 188 case pfstype_symlink: 189 vap->va_mode = 0444; 190 break; 191 default: 192 printf("shouldn't be here!\n"); 193 vap->va_mode = 0; 194 break; 195 } 196 197 if (pvd->pvd_pid != NO_PID) { 198 if ((proc = pfind(pvd->pvd_pid)) == NULL) 199 PFS_RETURN (ENOENT); 200 vap->va_uid = proc->p_ucred->cr_ruid; 201 vap->va_gid = proc->p_ucred->cr_rgid; 202 if (pn->pn_attr != NULL) 203 error = (pn->pn_attr)(va->a_td, proc, pn, vap); 204 PROC_UNLOCK(proc); 205 } else { 206 vap->va_uid = 0; 207 vap->va_gid = 0; 208 } 209 210 PFS_RETURN (error); 211 } 212 213 /* 214 * Perform an ioctl 215 */ 216 static int 217 pfs_ioctl(struct vop_ioctl_args *va) 218 { 219 struct vnode *vn = va->a_vp; 220 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 221 struct pfs_node *pn = pvd->pvd_pn; 222 struct proc *proc = NULL; 223 int error; 224 225 PFS_TRACE(("%s: %lx", pn->pn_name, va->a_command)); 226 227 if (vn->v_type != VREG) 228 PFS_RETURN (EINVAL); 229 230 if (pn->pn_ioctl == NULL) 231 PFS_RETURN (ENOTTY); 232 233 /* 234 * This is necessary because process' privileges may 235 * have changed since the open() call. 236 */ 237 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 238 PFS_RETURN (EIO); 239 240 /* XXX duplicates bits of pfs_visible() */ 241 if (pvd->pvd_pid != NO_PID) { 242 if ((proc = pfind(pvd->pvd_pid)) == NULL) 243 PFS_RETURN (EIO); 244 _PHOLD(proc); 245 PROC_UNLOCK(proc); 246 } 247 248 error = (pn->pn_ioctl)(curthread, proc, pn, va->a_command, va->a_data); 249 250 if (proc != NULL) 251 PRELE(proc); 252 253 PFS_RETURN (error); 254 } 255 256 /* 257 * Perform getextattr 258 */ 259 static int 260 pfs_getextattr(struct vop_getextattr_args *va) 261 { 262 struct vnode *vn = va->a_vp; 263 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 264 struct pfs_node *pn = pvd->pvd_pn; 265 struct proc *proc = NULL; 266 int error; 267 268 PFS_TRACE((pd->pn_name)); 269 270 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 271 PFS_RETURN (ENOENT); 272 273 if (pn->pn_getextattr == NULL) 274 PFS_RETURN (EOPNOTSUPP); 275 276 /* 277 * This is necessary because either process' privileges may 278 * have changed since the open() call. 279 */ 280 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 281 PFS_RETURN (EIO); 282 283 /* XXX duplicates bits of pfs_visible() */ 284 if (pvd->pvd_pid != NO_PID) { 285 if ((proc = pfind(pvd->pvd_pid)) == NULL) 286 PFS_RETURN (EIO); 287 _PHOLD(proc); 288 PROC_UNLOCK(proc); 289 } 290 291 error = (pn->pn_getextattr)(curthread, proc, pn, va->a_attrnamespace, 292 va->a_name, va->a_uio, va->a_size, va->a_cred); 293 294 if (proc != NULL) 295 PRELE(proc); 296 297 PFS_RETURN (error); 298 } 299 300 /* 301 * Look up a file or directory 302 * 303 * XXX NOTE! pfs_lookup() has been hooked into vop_lookup_desc! This 304 * will result in a lookup operation for a vnode which may already be 305 * cached, therefore we have to be careful to purge the VFS cache when 306 * reusing a vnode. 307 * 308 * This code will work, but is not really correct. Normally we would hook 309 * vfs_cache_lookup() into vop_lookup_desc and hook pfs_lookup() into 310 * vop_cachedlookup_desc. 311 */ 312 static int 313 pfs_lookup(struct vop_lookup_args *va) 314 { 315 struct vnode *vn = va->a_dvp; 316 struct vnode **vpp = va->a_vpp; 317 struct componentname *cnp = va->a_cnp; 318 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 319 struct pfs_node *pd = pvd->pvd_pn; 320 struct pfs_node *pn, *pdn = NULL; 321 pid_t pid = pvd->pvd_pid; 322 int lockparent; 323 int wantparent; 324 char *pname; 325 int error, i, namelen; 326 327 PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr)); 328 329 cnp->cn_flags &= ~PDIRUNLOCK; 330 331 if (vn->v_type != VDIR) 332 PFS_RETURN (ENOTDIR); 333 334 /* 335 * Don't support DELETE or RENAME. CREATE is supported so 336 * that O_CREAT will work, but the lookup will still fail if 337 * the file does not exist. 338 */ 339 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 340 PFS_RETURN (EOPNOTSUPP); 341 342 /* shortcut: check if the name is too long */ 343 if (cnp->cn_namelen >= PFS_NAMELEN) 344 PFS_RETURN (ENOENT); 345 346 /* check that parent directory is visisble... */ 347 if (!pfs_visible(curthread, pd, pvd->pvd_pid)) 348 PFS_RETURN (ENOENT); 349 350 lockparent = cnp->cn_flags & LOCKPARENT; 351 wantparent = cnp->cn_flags & (LOCKPARENT | WANTPARENT); 352 353 354 /* self */ 355 namelen = cnp->cn_namelen; 356 pname = cnp->cn_nameptr; 357 if (namelen == 1 && *pname == '.') { 358 pn = pd; 359 *vpp = vn; 360 VREF(vn); 361 PFS_RETURN (0); 362 } 363 364 /* parent */ 365 if (cnp->cn_flags & ISDOTDOT) { 366 if (pd->pn_type == pfstype_root) 367 PFS_RETURN (EIO); 368 VOP_UNLOCK(vn, 0, cnp->cn_thread); 369 cnp->cn_flags |= PDIRUNLOCK; 370 371 KASSERT(pd->pn_parent, ("non-root directory has no parent")); 372 /* 373 * This one is tricky. Descendents of procdir nodes 374 * inherit their parent's process affinity, but 375 * there's no easy reverse mapping. For simplicity, 376 * we assume that if this node is a procdir, its 377 * parent isn't (which is correct as long as 378 * descendents of procdir nodes are never procdir 379 * nodes themselves) 380 */ 381 if (pd->pn_type == pfstype_procdir) 382 pid = NO_PID; 383 pn = pd->pn_parent; 384 goto got_pnode; 385 } 386 387 /* named node */ 388 for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next) 389 if (pn->pn_type == pfstype_procdir) 390 pdn = pn; 391 else if (pn->pn_name[namelen] == '\0' 392 && bcmp(pname, pn->pn_name, namelen) == 0) 393 goto got_pnode; 394 395 /* process dependent node */ 396 if ((pn = pdn) != NULL) { 397 pid = 0; 398 for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i) 399 if ((pid = pid * 10 + pname[i] - '') > PID_MAX) 400 break; 401 if (i == cnp->cn_namelen) 402 goto got_pnode; 403 } 404 405 PFS_RETURN (ENOENT); 406 got_pnode: 407 if (pn != pd->pn_parent && !pn->pn_parent) 408 pn->pn_parent = pd; 409 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 410 PFS_RETURN (ENOENT); 411 412 error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid); 413 if (error) 414 PFS_RETURN (error); 415 416 if ((cnp->cn_flags & ISDOTDOT) && (cnp->cn_flags & ISLASTCN) 417 && lockparent) { 418 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 419 cnp->cn_flags &= ~PDIRUNLOCK; 420 } 421 if (!((lockparent && (cnp->cn_flags & ISLASTCN)) || 422 (cnp->cn_flags & ISDOTDOT))) 423 VOP_UNLOCK(vn, 0, cnp->cn_thread); 424 425 /* 426 * XXX See comment at top of the routine. 427 */ 428 if (cnp->cn_flags & MAKEENTRY) 429 cache_enter(vn, *vpp, cnp); 430 PFS_RETURN (0); 431 } 432 433 /* 434 * Open a file or directory. 435 */ 436 static int 437 pfs_open(struct vop_open_args *va) 438 { 439 struct vnode *vn = va->a_vp; 440 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 441 struct pfs_node *pn = pvd->pvd_pn; 442 int mode = va->a_mode; 443 444 PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode)); 445 446 /* 447 * check if the file is visible to the caller 448 * 449 * XXX Not sure if this is necessary, as the VFS system calls 450 * XXX pfs_lookup() and pfs_access() first, and pfs_lookup() 451 * XXX calls pfs_visible(). There's a race condition here, but 452 * XXX calling pfs_visible() from here doesn't really close it, 453 * XXX and the only consequence of that race is an EIO further 454 * XXX down the line. 455 */ 456 if (!pfs_visible(va->a_td, pn, pvd->pvd_pid)) 457 PFS_RETURN (ENOENT); 458 459 /* check if the requested mode is permitted */ 460 if (((mode & FREAD) && !(mode & PFS_RD)) || 461 ((mode & FWRITE) && !(mode & PFS_WR))) 462 PFS_RETURN (EPERM); 463 464 /* we don't support locking */ 465 if ((mode & O_SHLOCK) || (mode & O_EXLOCK)) 466 PFS_RETURN (EOPNOTSUPP); 467 468 PFS_RETURN (0); 469 } 470 471 /* 472 * Read from a file 473 */ 474 static int 475 pfs_read(struct vop_read_args *va) 476 { 477 struct vnode *vn = va->a_vp; 478 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 479 struct pfs_node *pn = pvd->pvd_pn; 480 struct uio *uio = va->a_uio; 481 struct proc *proc = NULL; 482 struct sbuf *sb = NULL; 483 int error; 484 unsigned int buflen, offset, resid; 485 486 PFS_TRACE((pn->pn_name)); 487 488 if (vn->v_type != VREG) 489 PFS_RETURN (EINVAL); 490 491 if (!(pn->pn_flags & PFS_RD)) 492 PFS_RETURN (EBADF); 493 494 if (pn->pn_func == NULL) 495 PFS_RETURN (EIO); 496 497 /* 498 * This is necessary because either process' privileges may 499 * have changed since the open() call. 500 */ 501 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 502 PFS_RETURN (EIO); 503 504 /* XXX duplicates bits of pfs_visible() */ 505 if (pvd->pvd_pid != NO_PID) { 506 if ((proc = pfind(pvd->pvd_pid)) == NULL) 507 PFS_RETURN (EIO); 508 _PHOLD(proc); 509 PROC_UNLOCK(proc); 510 } 511 512 if (pn->pn_flags & PFS_RAWRD) { 513 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 514 if (proc != NULL) 515 PRELE(proc); 516 PFS_RETURN (error); 517 } 518 519 /* Beaucoup sanity checks so we don't ask for bogus allocation. */ 520 if (uio->uio_offset < 0 || uio->uio_resid < 0 || 521 (offset = uio->uio_offset) != uio->uio_offset || 522 (resid = uio->uio_resid) != uio->uio_resid || 523 (buflen = offset + resid) < offset || buflen > INT_MAX) { 524 if (proc != NULL) 525 PRELE(proc); 526 PFS_RETURN (EINVAL); 527 } 528 if (buflen > MAXPHYS) { 529 if (proc != NULL) 530 PRELE(proc); 531 PFS_RETURN (EIO); 532 } 533 sb = sbuf_new(sb, NULL, buflen, 0); 534 if (sb == NULL) { 535 if (proc != NULL) 536 PRELE(proc); 537 PFS_RETURN (EIO); 538 } 539 540 error = (pn->pn_func)(curthread, proc, pn, sb, uio); 541 542 if (proc != NULL) 543 PRELE(proc); 544 545 if (error) { 546 sbuf_delete(sb); 547 PFS_RETURN (error); 548 } 549 550 sbuf_finish(sb); 551 error = uiomove_frombuf(sbuf_data(sb), sbuf_len(sb), uio); 552 sbuf_delete(sb); 553 PFS_RETURN (error); 554 } 555 556 /* 557 * Iterate through directory entries 558 */ 559 static int 560 pfs_iterate(struct thread *td, pid_t pid, struct pfs_node *pd, 561 struct pfs_node **pn, struct proc **p) 562 { 563 sx_assert(&allproc_lock, SX_LOCKED); 564 again: 565 if (*pn == NULL) { 566 /* first node */ 567 *pn = pd->pn_nodes; 568 } else if ((*pn)->pn_type != pfstype_procdir) { 569 /* next node */ 570 *pn = (*pn)->pn_next; 571 } 572 if (*pn != NULL && (*pn)->pn_type == pfstype_procdir) { 573 /* next process */ 574 if (*p == NULL) 575 *p = LIST_FIRST(&allproc); 576 else 577 *p = LIST_NEXT(*p, p_list); 578 /* out of processes: next node */ 579 if (*p == NULL) 580 *pn = (*pn)->pn_next; 581 } 582 583 if ((*pn) == NULL) 584 return (-1); 585 586 if (!pfs_visible(td, *pn, *p ? (*p)->p_pid : pid)) 587 goto again; 588 589 return (0); 590 } 591 592 /* 593 * Return directory entries. 594 */ 595 static int 596 pfs_readdir(struct vop_readdir_args *va) 597 { 598 struct vnode *vn = va->a_vp; 599 struct pfs_info *pi = (struct pfs_info *)vn->v_mount->mnt_data; 600 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 601 struct pfs_node *pd = pvd->pvd_pn; 602 pid_t pid = pvd->pvd_pid; 603 struct pfs_node *pn; 604 struct dirent entry; 605 struct uio *uio; 606 struct proc *p; 607 off_t offset; 608 int error, i, resid; 609 610 PFS_TRACE((pd->pn_name)); 611 612 if (vn->v_type != VDIR) 613 PFS_RETURN (ENOTDIR); 614 uio = va->a_uio; 615 616 /* check if the directory is visible to the caller */ 617 if (!pfs_visible(curthread, pd, pid)) 618 PFS_RETURN (ENOENT); 619 620 /* only allow reading entire entries */ 621 offset = uio->uio_offset; 622 resid = uio->uio_resid; 623 if (offset < 0 || offset % PFS_DELEN != 0 || resid < PFS_DELEN) 624 PFS_RETURN (EINVAL); 625 626 /* skip unwanted entries */ 627 sx_slock(&allproc_lock); 628 for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) 629 if (pfs_iterate(curthread, pid, pd, &pn, &p) == -1) { 630 /* nothing left... */ 631 sx_sunlock(&allproc_lock); 632 PFS_RETURN (0); 633 } 634 635 /* fill in entries */ 636 entry.d_reclen = PFS_DELEN; 637 while (pfs_iterate(curthread, pid, pd, &pn, &p) != -1 && resid > 0) { 638 if (!pn->pn_parent) 639 pn->pn_parent = pd; 640 if (!pn->pn_fileno) 641 pfs_fileno_alloc(pi, pn); 642 if (pid != NO_PID) 643 entry.d_fileno = pn->pn_fileno * NO_PID + pid; 644 else 645 entry.d_fileno = pn->pn_fileno; 646 /* PFS_DELEN was picked to fit PFS_NAMLEN */ 647 for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i) 648 entry.d_name[i] = pn->pn_name[i]; 649 entry.d_name[i] = 0; 650 entry.d_namlen = i; 651 switch (pn->pn_type) { 652 case pfstype_procdir: 653 KASSERT(p != NULL, 654 ("reached procdir node with p == NULL")); 655 entry.d_fileno = pn->pn_fileno * NO_PID + p->p_pid; 656 entry.d_namlen = snprintf(entry.d_name, 657 PFS_NAMELEN, "%d", p->p_pid); 658 /* fall through */ 659 case pfstype_root: 660 case pfstype_dir: 661 case pfstype_this: 662 case pfstype_parent: 663 entry.d_type = DT_DIR; 664 break; 665 case pfstype_file: 666 entry.d_type = DT_REG; 667 break; 668 case pfstype_symlink: 669 entry.d_type = DT_LNK; 670 break; 671 default: 672 sx_sunlock(&allproc_lock); 673 panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type); 674 } 675 PFS_TRACE((entry.d_name)); 676 if ((error = uiomove(&entry, PFS_DELEN, uio))) { 677 sx_sunlock(&allproc_lock); 678 PFS_RETURN (error); 679 } 680 offset += PFS_DELEN; 681 resid -= PFS_DELEN; 682 } 683 684 sx_sunlock(&allproc_lock); 685 uio->uio_offset += offset; 686 PFS_RETURN (0); 687 } 688 689 /* 690 * Read a symbolic link 691 */ 692 static int 693 pfs_readlink(struct vop_readlink_args *va) 694 { 695 struct vnode *vn = va->a_vp; 696 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 697 struct pfs_node *pn = pvd->pvd_pn; 698 struct uio *uio = va->a_uio; 699 struct proc *proc = NULL; 700 char buf[MAXPATHLEN]; 701 struct sbuf sb; 702 int error; 703 704 PFS_TRACE((pn->pn_name)); 705 706 if (vn->v_type != VLNK) 707 PFS_RETURN (EINVAL); 708 709 if (pn->pn_func == NULL) 710 PFS_RETURN (EIO); 711 712 if (pvd->pvd_pid != NO_PID) { 713 if ((proc = pfind(pvd->pvd_pid)) == NULL) 714 PFS_RETURN (EIO); 715 _PHOLD(proc); 716 PROC_UNLOCK(proc); 717 } 718 719 /* sbuf_new() can't fail with a static buffer */ 720 sbuf_new(&sb, buf, sizeof buf, 0); 721 722 error = (pn->pn_func)(curthread, proc, pn, &sb, NULL); 723 724 if (proc != NULL) 725 PRELE(proc); 726 727 if (error) { 728 sbuf_delete(&sb); 729 PFS_RETURN (error); 730 } 731 732 sbuf_finish(&sb); 733 error = uiomove_frombuf(sbuf_data(&sb), sbuf_len(&sb), uio); 734 sbuf_delete(&sb); 735 PFS_RETURN (error); 736 } 737 738 /* 739 * Reclaim a vnode 740 */ 741 static int 742 pfs_reclaim(struct vop_reclaim_args *va) 743 { 744 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 745 746 return (pfs_vncache_free(va->a_vp)); 747 } 748 749 /* 750 * Set attributes 751 */ 752 static int 753 pfs_setattr(struct vop_setattr_args *va) 754 { 755 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 756 757 PFS_RETURN (EOPNOTSUPP); 758 } 759 760 /* 761 * Read from a file 762 */ 763 static int 764 pfs_write(struct vop_read_args *va) 765 { 766 struct vnode *vn = va->a_vp; 767 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 768 struct pfs_node *pn = pvd->pvd_pn; 769 struct uio *uio = va->a_uio; 770 struct proc *proc = NULL; 771 struct sbuf sb; 772 int error; 773 774 PFS_TRACE((pn->pn_name)); 775 776 if (vn->v_type != VREG) 777 PFS_RETURN (EINVAL); 778 779 if (!(pn->pn_flags & PFS_WR)) 780 PFS_RETURN (EBADF); 781 782 if (pn->pn_func == NULL) 783 PFS_RETURN (EIO); 784 785 /* 786 * This is necessary because either process' privileges may 787 * have changed since the open() call. 788 */ 789 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 790 PFS_RETURN (EIO); 791 792 /* XXX duplicates bits of pfs_visible() */ 793 if (pvd->pvd_pid != NO_PID) { 794 if ((proc = pfind(pvd->pvd_pid)) == NULL) 795 PFS_RETURN (EIO); 796 _PHOLD(proc); 797 PROC_UNLOCK(proc); 798 } 799 800 if (pn->pn_flags & PFS_RAWWR) { 801 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 802 if (proc != NULL) 803 PRELE(proc); 804 PFS_RETURN (error); 805 } 806 807 sbuf_uionew(&sb, uio, &error); 808 if (error) 809 PFS_RETURN (error); 810 811 error = (pn->pn_func)(curthread, proc, pn, &sb, uio); 812 813 if (proc != NULL) 814 PRELE(proc); 815 816 sbuf_delete(&sb); 817 PFS_RETURN (error); 818 } 819 820 /* 821 * Vnode operations 822 */ 823 vop_t **pfs_vnodeop_p; 824 static struct vnodeopv_entry_desc pfs_vnodeop_entries[] = { 825 { &vop_default_desc, (vop_t *)vop_defaultop }, 826 { &vop_access_desc, (vop_t *)pfs_access }, 827 { &vop_close_desc, (vop_t *)pfs_close }, 828 { &vop_create_desc, (vop_t *)vop_eopnotsupp }, 829 { &vop_getattr_desc, (vop_t *)pfs_getattr }, 830 { &vop_getextattr_desc, (vop_t *)pfs_getextattr }, 831 { &vop_ioctl_desc, (vop_t *)pfs_ioctl }, 832 { &vop_link_desc, (vop_t *)vop_eopnotsupp }, 833 { &vop_lookup_desc, (vop_t *)pfs_lookup }, 834 { &vop_mkdir_desc, (vop_t *)vop_eopnotsupp }, 835 { &vop_mknod_desc, (vop_t *)vop_eopnotsupp }, 836 { &vop_open_desc, (vop_t *)pfs_open }, 837 { &vop_read_desc, (vop_t *)pfs_read }, 838 { &vop_readdir_desc, (vop_t *)pfs_readdir }, 839 { &vop_readlink_desc, (vop_t *)pfs_readlink }, 840 { &vop_reclaim_desc, (vop_t *)pfs_reclaim }, 841 { &vop_remove_desc, (vop_t *)vop_eopnotsupp }, 842 { &vop_rename_desc, (vop_t *)vop_eopnotsupp }, 843 { &vop_rmdir_desc, (vop_t *)vop_eopnotsupp }, 844 { &vop_setattr_desc, (vop_t *)pfs_setattr }, 845 { &vop_symlink_desc, (vop_t *)vop_eopnotsupp }, 846 { &vop_write_desc, (vop_t *)pfs_write }, 847 /* XXX I've probably forgotten a few that need vop_eopnotsupp */ 848 { NULL, (vop_t *)NULL } 849 }; 850 851 static struct vnodeopv_desc pfs_vnodeop_opv_desc = 852 { &pfs_vnodeop_p, pfs_vnodeop_entries }; 853 854 VNODEOP_SET(pfs_vnodeop_opv_desc);
Cache object: 059f2e566e0022525700c75af955e096
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