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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 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_pseudofs.h" 33 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/systm.h> 37 #include <sys/ctype.h> 38 #include <sys/dirent.h> 39 #include <sys/fcntl.h> 40 #include <sys/limits.h> 41 #include <sys/lock.h> 42 #include <sys/malloc.h> 43 #include <sys/mount.h> 44 #include <sys/mutex.h> 45 #include <sys/namei.h> 46 #include <sys/proc.h> 47 #include <sys/sbuf.h> 48 #include <sys/sx.h> 49 #include <sys/sysctl.h> 50 #include <sys/vnode.h> 51 52 #include <fs/pseudofs/pseudofs.h> 53 #include <fs/pseudofs/pseudofs_internal.h> 54 55 /* 56 * Returns the fileno, adjusted for target pid 57 */ 58 static uint32_t 59 pn_fileno(struct pfs_node *pn, pid_t pid) 60 { 61 62 KASSERT(pn->pn_fileno > 0, 63 ("%s(): no fileno allocated", __func__)); 64 if (pid != NO_PID) 65 return (pn->pn_fileno * NO_PID + pid); 66 return (pn->pn_fileno); 67 } 68 69 /* 70 * Returns non-zero if given file is visible to given thread. 71 */ 72 static int 73 pfs_visible_proc(struct thread *td, struct pfs_node *pn, struct proc *proc) 74 { 75 int visible; 76 77 if (proc == NULL) 78 return (0); 79 80 PROC_LOCK_ASSERT(proc, MA_OWNED); 81 82 visible = ((proc->p_flag & P_WEXIT) == 0); 83 if (visible) 84 visible = (p_cansee(td, proc) == 0); 85 if (visible && pn->pn_vis != NULL) 86 visible = pn_vis(td, proc, pn); 87 if (!visible) 88 return (0); 89 return (1); 90 } 91 92 static int 93 pfs_visible(struct thread *td, struct pfs_node *pn, pid_t pid, struct proc **p) 94 { 95 struct proc *proc; 96 97 PFS_TRACE(("%s (pid: %d, req: %d)", 98 pn->pn_name, pid, td->td_proc->p_pid)); 99 100 if (p) 101 *p = NULL; 102 if (pid == NO_PID) 103 PFS_RETURN (1); 104 if ((proc = pfind(pid)) == NULL) 105 PFS_RETURN (0); 106 if (pfs_visible_proc(td, pn, proc)) { 107 if (p) 108 *p = proc; 109 else 110 PROC_UNLOCK(proc); 111 PFS_RETURN (1); 112 } 113 PROC_UNLOCK(proc); 114 PFS_RETURN (0); 115 } 116 117 /* 118 * Verify permissions 119 */ 120 static int 121 pfs_access(struct vop_access_args *va) 122 { 123 struct vnode *vn = va->a_vp; 124 struct pfs_vdata *pvd = vn->v_data; 125 struct vattr vattr; 126 int error; 127 128 PFS_TRACE(("%s", pvd->pvd_pn->pn_name)); 129 (void)pvd; 130 131 error = VOP_GETATTR(vn, &vattr, va->a_cred, va->a_td); 132 if (error) 133 PFS_RETURN (error); 134 error = vaccess(vn->v_type, vattr.va_mode, vattr.va_uid, 135 vattr.va_gid, va->a_mode, va->a_cred, NULL); 136 PFS_RETURN (error); 137 } 138 139 /* 140 * Close a file or directory 141 */ 142 static int 143 pfs_close(struct vop_close_args *va) 144 { 145 struct vnode *vn = va->a_vp; 146 struct pfs_vdata *pvd = vn->v_data; 147 struct pfs_node *pn = pvd->pvd_pn; 148 struct proc *proc; 149 int error; 150 151 PFS_TRACE(("%s", pn->pn_name)); 152 pfs_assert_not_owned(pn); 153 154 /* 155 * Do nothing unless this is the last close and the node has a 156 * last-close handler. 157 */ 158 if (vrefcnt(vn) > 1 || pn->pn_close == NULL) 159 PFS_RETURN (0); 160 161 if (pvd->pvd_pid != NO_PID) { 162 proc = pfind(pvd->pvd_pid); 163 } else { 164 proc = NULL; 165 } 166 167 error = pn_close(va->a_td, proc, pn); 168 169 if (proc != NULL) 170 PROC_UNLOCK(proc); 171 172 PFS_RETURN (error); 173 } 174 175 /* 176 * Get file attributes 177 */ 178 static int 179 pfs_getattr(struct vop_getattr_args *va) 180 { 181 struct vnode *vn = va->a_vp; 182 struct pfs_vdata *pvd = vn->v_data; 183 struct pfs_node *pn = pvd->pvd_pn; 184 struct vattr *vap = va->a_vap; 185 struct proc *proc; 186 int error = 0; 187 188 PFS_TRACE(("%s", pn->pn_name)); 189 pfs_assert_not_owned(pn); 190 191 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 192 PFS_RETURN (ENOENT); 193 194 vap->va_type = vn->v_type; 195 vap->va_fileid = pn_fileno(pn, pvd->pvd_pid); 196 vap->va_flags = 0; 197 vap->va_blocksize = PAGE_SIZE; 198 vap->va_bytes = vap->va_size = 0; 199 vap->va_filerev = 0; 200 vap->va_fsid = vn->v_mount->mnt_stat.f_fsid.val[0]; 201 vap->va_nlink = 1; 202 nanotime(&vap->va_ctime); 203 vap->va_atime = vap->va_mtime = vap->va_ctime; 204 205 switch (pn->pn_type) { 206 case pfstype_procdir: 207 case pfstype_root: 208 case pfstype_dir: 209 #if 0 210 pfs_lock(pn); 211 /* compute link count */ 212 pfs_unlock(pn); 213 #endif 214 vap->va_mode = 0555; 215 break; 216 case pfstype_file: 217 case pfstype_symlink: 218 vap->va_mode = 0444; 219 break; 220 default: 221 printf("shouldn't be here!\n"); 222 vap->va_mode = 0; 223 break; 224 } 225 226 if (proc != NULL) { 227 vap->va_uid = proc->p_ucred->cr_ruid; 228 vap->va_gid = proc->p_ucred->cr_rgid; 229 if (pn->pn_attr != NULL) 230 error = pn_attr(va->a_td, proc, pn, vap); 231 PROC_UNLOCK(proc); 232 } else { 233 vap->va_uid = 0; 234 vap->va_gid = 0; 235 } 236 237 PFS_RETURN (error); 238 } 239 240 /* 241 * Perform an ioctl 242 */ 243 static int 244 pfs_ioctl(struct vop_ioctl_args *va) 245 { 246 struct vnode *vn = va->a_vp; 247 struct pfs_vdata *pvd = vn->v_data; 248 struct pfs_node *pn = pvd->pvd_pn; 249 struct proc *proc; 250 int error; 251 252 PFS_TRACE(("%s: %lx", pn->pn_name, va->a_command)); 253 pfs_assert_not_owned(pn); 254 255 if (vn->v_type != VREG) 256 PFS_RETURN (EINVAL); 257 258 if (pn->pn_ioctl == NULL) 259 PFS_RETURN (ENOTTY); 260 261 /* 262 * This is necessary because process' privileges may 263 * have changed since the open() call. 264 */ 265 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 266 PFS_RETURN (EIO); 267 268 error = pn_ioctl(curthread, proc, pn, va->a_command, va->a_data); 269 270 if (proc != NULL) 271 PROC_UNLOCK(proc); 272 273 PFS_RETURN (error); 274 } 275 276 /* 277 * Perform getextattr 278 */ 279 static int 280 pfs_getextattr(struct vop_getextattr_args *va) 281 { 282 struct vnode *vn = va->a_vp; 283 struct pfs_vdata *pvd = vn->v_data; 284 struct pfs_node *pn = pvd->pvd_pn; 285 struct proc *proc; 286 int error; 287 288 PFS_TRACE(("%s", pn->pn_name)); 289 pfs_assert_not_owned(pn); 290 291 /* 292 * This is necessary because either process' privileges may 293 * have changed since the open() call. 294 */ 295 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 296 PFS_RETURN (EIO); 297 298 if (pn->pn_getextattr == NULL) 299 error = EOPNOTSUPP; 300 else 301 error = pn_getextattr(curthread, proc, pn, 302 va->a_attrnamespace, va->a_name, va->a_uio, 303 va->a_size, va->a_cred); 304 305 if (proc != NULL) 306 PROC_UNLOCK(proc); 307 308 pfs_unlock(pn); 309 PFS_RETURN (error); 310 } 311 312 /* 313 * Look up a file or directory 314 */ 315 static int 316 pfs_lookup(struct vop_cachedlookup_args *va) 317 { 318 struct vnode *vn = va->a_dvp; 319 struct vnode **vpp = va->a_vpp; 320 struct componentname *cnp = va->a_cnp; 321 struct pfs_vdata *pvd = vn->v_data; 322 struct pfs_node *pd = pvd->pvd_pn; 323 struct pfs_node *pn, *pdn = NULL; 324 pid_t pid = pvd->pvd_pid; 325 char *pname; 326 int error, i, namelen, visible; 327 328 PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr)); 329 pfs_assert_not_owned(pd); 330 331 if (vn->v_type != VDIR) 332 PFS_RETURN (ENOTDIR); 333 334 error = VOP_ACCESS(vn, VEXEC, cnp->cn_cred, cnp->cn_thread); 335 if (error) 336 PFS_RETURN (error); 337 338 /* 339 * Don't support DELETE or RENAME. CREATE is supported so 340 * that O_CREAT will work, but the lookup will still fail if 341 * the file does not exist. 342 */ 343 if ((cnp->cn_flags & ISLASTCN) && 344 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 345 PFS_RETURN (EOPNOTSUPP); 346 347 /* shortcut: check if the name is too long */ 348 if (cnp->cn_namelen >= PFS_NAMELEN) 349 PFS_RETURN (ENOENT); 350 351 /* check that parent directory is visible... */ 352 if (!pfs_visible(curthread, pd, pvd->pvd_pid, NULL)) 353 PFS_RETURN (ENOENT); 354 355 /* self */ 356 namelen = cnp->cn_namelen; 357 pname = cnp->cn_nameptr; 358 if (namelen == 1 && pname[0] == '.') { 359 pn = pd; 360 *vpp = vn; 361 VREF(vn); 362 PFS_RETURN (0); 363 } 364 365 /* parent */ 366 if (cnp->cn_flags & ISDOTDOT) { 367 if (pd->pn_type == pfstype_root) 368 PFS_RETURN (EIO); 369 VOP_UNLOCK(vn, 0, cnp->cn_thread); 370 KASSERT(pd->pn_parent != NULL, 371 ("%s(): non-root directory has no parent", __func__)); 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 pfs_lock(pd); 384 pn = pd->pn_parent; 385 pfs_unlock(pd); 386 goto got_pnode; 387 } 388 389 pfs_lock(pd); 390 391 /* named node */ 392 for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next) 393 if (pn->pn_type == pfstype_procdir) 394 pdn = pn; 395 else if (pn->pn_name[namelen] == '\0' && 396 bcmp(pname, pn->pn_name, namelen) == 0) { 397 pfs_unlock(pd); 398 goto got_pnode; 399 } 400 401 /* process dependent node */ 402 if ((pn = pdn) != NULL) { 403 pid = 0; 404 for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i) 405 if ((pid = pid * 10 + pname[i] - '') > PID_MAX) 406 break; 407 if (i == cnp->cn_namelen) { 408 pfs_unlock(pd); 409 goto got_pnode; 410 } 411 } 412 413 pfs_unlock(pd); 414 415 PFS_RETURN (ENOENT); 416 417 got_pnode: 418 pfs_assert_not_owned(pd); 419 pfs_assert_not_owned(pn); 420 visible = pfs_visible(curthread, pn, pid, NULL); 421 if (!visible) { 422 error = ENOENT; 423 goto failed; 424 } 425 426 error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid); 427 if (error) 428 goto failed; 429 430 if (cnp->cn_flags & ISDOTDOT) 431 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 432 if (cnp->cn_flags & MAKEENTRY) 433 cache_enter(vn, *vpp, cnp); 434 PFS_RETURN (0); 435 failed: 436 if (cnp->cn_flags & ISDOTDOT) 437 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 438 PFS_RETURN(error); 439 } 440 441 /* 442 * Open a file or directory. 443 */ 444 static int 445 pfs_open(struct vop_open_args *va) 446 { 447 struct vnode *vn = va->a_vp; 448 struct pfs_vdata *pvd = vn->v_data; 449 struct pfs_node *pn = pvd->pvd_pn; 450 int mode = va->a_mode; 451 452 PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode)); 453 pfs_assert_not_owned(pn); 454 455 /* check if the requested mode is permitted */ 456 if (((mode & FREAD) && !(mode & PFS_RD)) || 457 ((mode & FWRITE) && !(mode & PFS_WR))) 458 PFS_RETURN (EPERM); 459 460 /* we don't support locking */ 461 if ((mode & O_SHLOCK) || (mode & O_EXLOCK)) 462 PFS_RETURN (EOPNOTSUPP); 463 464 PFS_RETURN (0); 465 } 466 467 /* 468 * Read from a file 469 */ 470 static int 471 pfs_read(struct vop_read_args *va) 472 { 473 struct vnode *vn = va->a_vp; 474 struct pfs_vdata *pvd = vn->v_data; 475 struct pfs_node *pn = pvd->pvd_pn; 476 struct uio *uio = va->a_uio; 477 struct proc *proc; 478 struct sbuf *sb = NULL; 479 int error, locked; 480 unsigned int buflen, offset, resid; 481 482 PFS_TRACE(("%s", pn->pn_name)); 483 pfs_assert_not_owned(pn); 484 485 if (vn->v_type != VREG) 486 PFS_RETURN (EINVAL); 487 488 if (!(pn->pn_flags & PFS_RD)) 489 PFS_RETURN (EBADF); 490 491 if (pn->pn_fill == NULL) 492 PFS_RETURN (EIO); 493 494 /* 495 * This is necessary because either process' privileges may 496 * have changed since the open() call. 497 */ 498 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 499 PFS_RETURN (EIO); 500 if (proc != NULL) { 501 _PHOLD(proc); 502 PROC_UNLOCK(proc); 503 } 504 505 vhold(vn); 506 locked = VOP_ISLOCKED(vn, curthread); 507 VOP_UNLOCK(vn, 0, curthread); 508 509 if (pn->pn_flags & PFS_RAWRD) { 510 PFS_TRACE(("%lu resid", (unsigned long)uio->uio_resid)); 511 error = pn_fill(curthread, proc, pn, NULL, uio); 512 PFS_TRACE(("%lu resid", (unsigned long)uio->uio_resid)); 513 goto ret; 514 } 515 516 /* beaucoup sanity checks so we don't ask for bogus allocation */ 517 if (uio->uio_offset < 0 || uio->uio_resid < 0 || 518 (offset = uio->uio_offset) != uio->uio_offset || 519 (resid = uio->uio_resid) != uio->uio_resid || 520 (buflen = offset + resid + 1) < offset || buflen > INT_MAX) { 521 if (proc != NULL) 522 PRELE(proc); 523 error = EINVAL; 524 goto ret; 525 } 526 if (buflen > MAXPHYS + 1) { 527 error = EIO; 528 goto ret; 529 } 530 531 sb = sbuf_new(sb, NULL, buflen, 0); 532 if (sb == NULL) { 533 error = EIO; 534 goto ret; 535 } 536 537 error = pn_fill(curthread, proc, pn, sb, uio); 538 539 if (error) { 540 sbuf_delete(sb); 541 goto ret; 542 } 543 544 sbuf_finish(sb); 545 error = uiomove_frombuf(sbuf_data(sb), sbuf_len(sb), uio); 546 sbuf_delete(sb); 547 ret: 548 vn_lock(vn, locked | LK_RETRY, curthread); 549 vdrop(vn); 550 if (proc != NULL) 551 PRELE(proc); 552 PFS_RETURN (error); 553 } 554 555 /* 556 * Iterate through directory entries 557 */ 558 static int 559 pfs_iterate(struct thread *td, struct proc *proc, struct pfs_node *pd, 560 struct pfs_node **pn, struct proc **p) 561 { 562 int visible; 563 564 sx_assert(&allproc_lock, SX_SLOCKED); 565 pfs_assert_owned(pd); 566 again: 567 if (*pn == NULL) { 568 /* first node */ 569 *pn = pd->pn_nodes; 570 } else if ((*pn)->pn_type != pfstype_procdir) { 571 /* next node */ 572 *pn = (*pn)->pn_next; 573 } 574 if (*pn != NULL && (*pn)->pn_type == pfstype_procdir) { 575 /* next process */ 576 if (*p == NULL) 577 *p = LIST_FIRST(&allproc); 578 else 579 *p = LIST_NEXT(*p, p_list); 580 /* out of processes: next node */ 581 if (*p == NULL) 582 *pn = (*pn)->pn_next; 583 else 584 PROC_LOCK(*p); 585 } 586 587 if ((*pn) == NULL) 588 return (-1); 589 590 if (*p != NULL) { 591 visible = pfs_visible_proc(td, *pn, *p); 592 PROC_UNLOCK(*p); 593 } else if (proc != NULL) { 594 visible = pfs_visible_proc(td, *pn, proc); 595 } else { 596 visible = 1; 597 } 598 if (!visible) 599 goto again; 600 601 return (0); 602 } 603 604 /* 605 * Return directory entries. 606 */ 607 static int 608 pfs_readdir(struct vop_readdir_args *va) 609 { 610 struct vnode *vn = va->a_vp; 611 struct pfs_vdata *pvd = vn->v_data; 612 struct pfs_node *pd = pvd->pvd_pn; 613 pid_t pid = pvd->pvd_pid; 614 struct proc *p, *proc; 615 struct pfs_node *pn; 616 struct dirent *entry; 617 struct uio *uio; 618 off_t offset; 619 int error, i, resid; 620 char *buf, *ent; 621 622 KASSERT(pd->pn_info == vn->v_mount->mnt_data, 623 ("%s(): pn_info does not match mountpoint", __func__)); 624 PFS_TRACE(("%s pid %lu", pd->pn_name, (unsigned long)pid)); 625 pfs_assert_not_owned(pd); 626 627 if (vn->v_type != VDIR) 628 PFS_RETURN (ENOTDIR); 629 uio = va->a_uio; 630 631 /* only allow reading entire entries */ 632 offset = uio->uio_offset; 633 resid = uio->uio_resid; 634 if (offset < 0 || offset % PFS_DELEN != 0 || 635 (resid && resid < PFS_DELEN)) 636 PFS_RETURN (EINVAL); 637 if (resid == 0) 638 PFS_RETURN (0); 639 640 /* can't do this while holding the proc lock... */ 641 buf = malloc(resid, M_IOV, M_WAITOK | M_ZERO); 642 sx_slock(&allproc_lock); 643 pfs_lock(pd); 644 645 /* check if the directory is visible to the caller */ 646 if (!pfs_visible(curthread, pd, pid, &proc)) { 647 sx_sunlock(&allproc_lock); 648 pfs_unlock(pd); 649 free(buf, M_IOV); 650 PFS_RETURN (ENOENT); 651 } 652 KASSERT(pid == NO_PID || proc != NULL, 653 ("%s(): no process for pid %lu", __func__, (unsigned long)pid)); 654 655 /* skip unwanted entries */ 656 for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) { 657 if (pfs_iterate(curthread, proc, pd, &pn, &p) == -1) { 658 /* nothing left... */ 659 if (proc != NULL) 660 PROC_UNLOCK(proc); 661 pfs_unlock(pd); 662 sx_sunlock(&allproc_lock); 663 free(buf, M_IOV); 664 PFS_RETURN (0); 665 } 666 } 667 668 /* fill in entries */ 669 ent = buf; 670 while (pfs_iterate(curthread, proc, pd, &pn, &p) != -1 && 671 resid >= PFS_DELEN) { 672 entry = (struct dirent *)ent; 673 entry->d_reclen = PFS_DELEN; 674 entry->d_fileno = pn_fileno(pn, pid); 675 /* PFS_DELEN was picked to fit PFS_NAMLEN */ 676 for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i) 677 entry->d_name[i] = pn->pn_name[i]; 678 entry->d_name[i] = 0; 679 entry->d_namlen = i; 680 switch (pn->pn_type) { 681 case pfstype_procdir: 682 KASSERT(p != NULL, 683 ("reached procdir node with p == NULL")); 684 entry->d_namlen = snprintf(entry->d_name, 685 PFS_NAMELEN, "%d", p->p_pid); 686 /* fall through */ 687 case pfstype_root: 688 case pfstype_dir: 689 case pfstype_this: 690 case pfstype_parent: 691 entry->d_type = DT_DIR; 692 break; 693 case pfstype_file: 694 entry->d_type = DT_REG; 695 break; 696 case pfstype_symlink: 697 entry->d_type = DT_LNK; 698 break; 699 default: 700 panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type); 701 } 702 PFS_TRACE(("%s", entry->d_name)); 703 offset += PFS_DELEN; 704 resid -= PFS_DELEN; 705 ent += PFS_DELEN; 706 } 707 if (proc != NULL) 708 PROC_UNLOCK(proc); 709 pfs_unlock(pd); 710 sx_sunlock(&allproc_lock); 711 PFS_TRACE(("%zd bytes", ent - buf)); 712 error = uiomove(buf, ent - buf, uio); 713 free(buf, M_IOV); 714 PFS_RETURN (error); 715 } 716 717 /* 718 * Read a symbolic link 719 */ 720 static int 721 pfs_readlink(struct vop_readlink_args *va) 722 { 723 struct vnode *vn = va->a_vp; 724 struct pfs_vdata *pvd = vn->v_data; 725 struct pfs_node *pn = pvd->pvd_pn; 726 struct uio *uio = va->a_uio; 727 struct proc *proc = NULL; 728 char buf[PATH_MAX]; 729 struct sbuf sb; 730 int error; 731 732 PFS_TRACE(("%s", pn->pn_name)); 733 pfs_assert_not_owned(pn); 734 735 if (vn->v_type != VLNK) 736 PFS_RETURN (EINVAL); 737 738 if (pn->pn_fill == NULL) 739 PFS_RETURN (EIO); 740 741 if (pvd->pvd_pid != NO_PID) { 742 if ((proc = pfind(pvd->pvd_pid)) == NULL) 743 PFS_RETURN (EIO); 744 if (proc->p_flag & P_WEXIT) { 745 PROC_UNLOCK(proc); 746 PFS_RETURN (EIO); 747 } 748 _PHOLD(proc); 749 PROC_UNLOCK(proc); 750 } 751 752 /* sbuf_new() can't fail with a static buffer */ 753 sbuf_new(&sb, buf, sizeof buf, 0); 754 755 error = pn_fill(curthread, proc, pn, &sb, NULL); 756 757 if (proc != NULL) 758 PRELE(proc); 759 760 if (error) { 761 sbuf_delete(&sb); 762 PFS_RETURN (error); 763 } 764 765 sbuf_finish(&sb); 766 error = uiomove_frombuf(sbuf_data(&sb), sbuf_len(&sb), uio); 767 sbuf_delete(&sb); 768 PFS_RETURN (error); 769 } 770 771 /* 772 * Reclaim a vnode 773 */ 774 static int 775 pfs_reclaim(struct vop_reclaim_args *va) 776 { 777 struct vnode *vn = va->a_vp; 778 struct pfs_vdata *pvd = vn->v_data; 779 struct pfs_node *pn = pvd->pvd_pn; 780 781 PFS_TRACE(("%s", pn->pn_name)); 782 pfs_assert_not_owned(pn); 783 784 return (pfs_vncache_free(va->a_vp)); 785 } 786 787 /* 788 * Set attributes 789 */ 790 static int 791 pfs_setattr(struct vop_setattr_args *va) 792 { 793 struct vnode *vn = va->a_vp; 794 struct pfs_vdata *pvd = vn->v_data; 795 struct pfs_node *pn = pvd->pvd_pn; 796 797 PFS_TRACE(("%s", pn->pn_name)); 798 pfs_assert_not_owned(pn); 799 800 PFS_RETURN (EOPNOTSUPP); 801 } 802 803 /* 804 * Write to a file 805 */ 806 static int 807 pfs_write(struct vop_write_args *va) 808 { 809 struct vnode *vn = va->a_vp; 810 struct pfs_vdata *pvd = vn->v_data; 811 struct pfs_node *pn = pvd->pvd_pn; 812 struct uio *uio = va->a_uio; 813 struct proc *proc; 814 struct sbuf sb; 815 int error; 816 817 PFS_TRACE(("%s", pn->pn_name)); 818 pfs_assert_not_owned(pn); 819 820 if (vn->v_type != VREG) 821 PFS_RETURN (EINVAL); 822 KASSERT(pn->pn_type != pfstype_file, 823 ("%s(): VREG vnode refers to non-file pfs_node", __func__)); 824 825 if (!(pn->pn_flags & PFS_WR)) 826 PFS_RETURN (EBADF); 827 828 if (pn->pn_fill == NULL) 829 PFS_RETURN (EIO); 830 831 /* 832 * This is necessary because either process' privileges may 833 * have changed since the open() call. 834 */ 835 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 836 PFS_RETURN (EIO); 837 if (proc != NULL) { 838 _PHOLD(proc); 839 PROC_UNLOCK(proc); 840 } 841 842 if (pn->pn_flags & PFS_RAWWR) { 843 pfs_lock(pn); 844 error = pn_fill(curthread, proc, pn, NULL, uio); 845 pfs_unlock(pn); 846 if (proc != NULL) 847 PRELE(proc); 848 PFS_RETURN (error); 849 } 850 851 sbuf_uionew(&sb, uio, &error); 852 if (error) { 853 if (proc != NULL) 854 PRELE(proc); 855 PFS_RETURN (error); 856 } 857 858 error = pn_fill(curthread, proc, pn, &sb, uio); 859 860 sbuf_delete(&sb); 861 if (proc != NULL) 862 PRELE(proc); 863 PFS_RETURN (error); 864 } 865 866 /* 867 * Vnode operations 868 */ 869 struct vop_vector pfs_vnodeops = { 870 .vop_default = &default_vnodeops, 871 872 .vop_access = pfs_access, 873 .vop_cachedlookup = pfs_lookup, 874 .vop_close = pfs_close, 875 .vop_create = VOP_EOPNOTSUPP, 876 .vop_getattr = pfs_getattr, 877 .vop_getextattr = pfs_getextattr, 878 .vop_ioctl = pfs_ioctl, 879 .vop_link = VOP_EOPNOTSUPP, 880 .vop_lookup = vfs_cache_lookup, 881 .vop_mkdir = VOP_EOPNOTSUPP, 882 .vop_mknod = VOP_EOPNOTSUPP, 883 .vop_open = pfs_open, 884 .vop_read = pfs_read, 885 .vop_readdir = pfs_readdir, 886 .vop_readlink = pfs_readlink, 887 .vop_reclaim = pfs_reclaim, 888 .vop_remove = VOP_EOPNOTSUPP, 889 .vop_rename = VOP_EOPNOTSUPP, 890 .vop_rmdir = VOP_EOPNOTSUPP, 891 .vop_setattr = pfs_setattr, 892 .vop_symlink = VOP_EOPNOTSUPP, 893 .vop_write = pfs_write, 894 /* XXX I've probably forgotten a few that need VOP_EOPNOTSUPP */ 895 };
Cache object: 9a45346a9aba26bd12bdb9565e22aea7
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