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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: releng/7.1/sys/fs/pseudofs/pseudofs_vnops.c 215103 2010-11-10 23:36:13Z cperciva $"); 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 VATTR_NULL(vap); 195 vap->va_type = vn->v_type; 196 vap->va_fileid = pn_fileno(pn, pvd->pvd_pid); 197 vap->va_flags = 0; 198 vap->va_blocksize = PAGE_SIZE; 199 vap->va_bytes = vap->va_size = 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_RETURN (error); 309 } 310 311 /* 312 * Look up a file or directory 313 */ 314 static int 315 pfs_lookup(struct vop_cachedlookup_args *va) 316 { 317 struct vnode *vn = va->a_dvp; 318 struct vnode **vpp = va->a_vpp; 319 struct componentname *cnp = va->a_cnp; 320 struct pfs_vdata *pvd = vn->v_data; 321 struct pfs_node *pd = pvd->pvd_pn; 322 struct pfs_node *pn, *pdn = NULL; 323 pid_t pid = pvd->pvd_pid; 324 char *pname; 325 int error, i, namelen, visible; 326 327 PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr)); 328 pfs_assert_not_owned(pd); 329 330 if (vn->v_type != VDIR) 331 PFS_RETURN (ENOTDIR); 332 333 error = VOP_ACCESS(vn, VEXEC, cnp->cn_cred, cnp->cn_thread); 334 if (error) 335 PFS_RETURN (error); 336 337 /* 338 * Don't support DELETE or RENAME. CREATE is supported so 339 * that O_CREAT will work, but the lookup will still fail if 340 * the file does not exist. 341 */ 342 if ((cnp->cn_flags & ISLASTCN) && 343 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 344 PFS_RETURN (EOPNOTSUPP); 345 346 /* shortcut: check if the name is too long */ 347 if (cnp->cn_namelen >= PFS_NAMELEN) 348 PFS_RETURN (ENOENT); 349 350 /* check that parent directory is visible... */ 351 if (!pfs_visible(curthread, pd, pvd->pvd_pid, NULL)) 352 PFS_RETURN (ENOENT); 353 354 /* self */ 355 namelen = cnp->cn_namelen; 356 pname = cnp->cn_nameptr; 357 if (namelen == 1 && pname[0] == '.') { 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 KASSERT(pd->pn_parent != NULL, 370 ("%s(): non-root directory has no parent", __func__)); 371 /* 372 * This one is tricky. Descendents of procdir nodes 373 * inherit their parent's process affinity, but 374 * there's no easy reverse mapping. For simplicity, 375 * we assume that if this node is a procdir, its 376 * parent isn't (which is correct as long as 377 * descendents of procdir nodes are never procdir 378 * nodes themselves) 379 */ 380 if (pd->pn_type == pfstype_procdir) 381 pid = NO_PID; 382 pfs_lock(pd); 383 pn = pd->pn_parent; 384 pfs_unlock(pd); 385 goto got_pnode; 386 } 387 388 pfs_lock(pd); 389 390 /* named node */ 391 for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next) 392 if (pn->pn_type == pfstype_procdir) 393 pdn = pn; 394 else if (pn->pn_name[namelen] == '\0' && 395 bcmp(pname, pn->pn_name, namelen) == 0) { 396 pfs_unlock(pd); 397 goto got_pnode; 398 } 399 400 /* process dependent node */ 401 if ((pn = pdn) != NULL) { 402 pid = 0; 403 for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i) 404 if ((pid = pid * 10 + pname[i] - '') > PID_MAX) 405 break; 406 if (i == cnp->cn_namelen) { 407 pfs_unlock(pd); 408 goto got_pnode; 409 } 410 } 411 412 pfs_unlock(pd); 413 414 PFS_RETURN (ENOENT); 415 416 got_pnode: 417 pfs_assert_not_owned(pd); 418 pfs_assert_not_owned(pn); 419 visible = pfs_visible(curthread, pn, pid, NULL); 420 if (!visible) { 421 error = ENOENT; 422 goto failed; 423 } 424 425 error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid); 426 if (error) 427 goto failed; 428 429 if (cnp->cn_flags & ISDOTDOT) 430 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 431 if (cnp->cn_flags & MAKEENTRY) 432 cache_enter(vn, *vpp, cnp); 433 PFS_RETURN (0); 434 failed: 435 if (cnp->cn_flags & ISDOTDOT) 436 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 437 PFS_RETURN(error); 438 } 439 440 /* 441 * Open a file or directory. 442 */ 443 static int 444 pfs_open(struct vop_open_args *va) 445 { 446 struct vnode *vn = va->a_vp; 447 struct pfs_vdata *pvd = vn->v_data; 448 struct pfs_node *pn = pvd->pvd_pn; 449 int mode = va->a_mode; 450 451 PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode)); 452 pfs_assert_not_owned(pn); 453 454 /* check if the requested mode is permitted */ 455 if (((mode & FREAD) && !(mode & PFS_RD)) || 456 ((mode & FWRITE) && !(mode & PFS_WR))) 457 PFS_RETURN (EPERM); 458 459 /* we don't support locking */ 460 if ((mode & O_SHLOCK) || (mode & O_EXLOCK)) 461 PFS_RETURN (EOPNOTSUPP); 462 463 PFS_RETURN (0); 464 } 465 466 /* 467 * Read from a file 468 */ 469 static int 470 pfs_read(struct vop_read_args *va) 471 { 472 struct vnode *vn = va->a_vp; 473 struct pfs_vdata *pvd = vn->v_data; 474 struct pfs_node *pn = pvd->pvd_pn; 475 struct uio *uio = va->a_uio; 476 struct proc *proc; 477 struct sbuf *sb = NULL; 478 int error; 479 unsigned int buflen, offset, resid; 480 481 PFS_TRACE(("%s", pn->pn_name)); 482 pfs_assert_not_owned(pn); 483 484 if (vn->v_type != VREG) 485 PFS_RETURN (EINVAL); 486 487 if (!(pn->pn_flags & PFS_RD)) 488 PFS_RETURN (EBADF); 489 490 if (pn->pn_fill == NULL) 491 PFS_RETURN (EIO); 492 493 /* 494 * This is necessary because either process' privileges may 495 * have changed since the open() call. 496 */ 497 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 498 PFS_RETURN (EIO); 499 if (proc != NULL) { 500 _PHOLD(proc); 501 PROC_UNLOCK(proc); 502 } 503 504 if (pn->pn_flags & PFS_RAWRD) { 505 PFS_TRACE(("%lu resid", (unsigned long)uio->uio_resid)); 506 error = pn_fill(curthread, proc, pn, NULL, uio); 507 PFS_TRACE(("%lu resid", (unsigned long)uio->uio_resid)); 508 if (proc != NULL) 509 PRELE(proc); 510 PFS_RETURN (error); 511 } 512 513 /* beaucoup sanity checks so we don't ask for bogus allocation */ 514 if (uio->uio_offset < 0 || uio->uio_resid < 0 || 515 (offset = uio->uio_offset) != uio->uio_offset || 516 (resid = uio->uio_resid) != uio->uio_resid || 517 (buflen = offset + resid + 1) < offset || buflen > INT_MAX) { 518 if (proc != NULL) 519 PRELE(proc); 520 PFS_RETURN (EINVAL); 521 } 522 if (buflen > MAXPHYS + 1) { 523 if (proc != NULL) 524 PRELE(proc); 525 PFS_RETURN (EIO); 526 } 527 528 sb = sbuf_new(sb, NULL, buflen, 0); 529 if (sb == NULL) { 530 if (proc != NULL) 531 PRELE(proc); 532 PFS_RETURN (EIO); 533 } 534 535 error = pn_fill(curthread, proc, pn, sb, uio); 536 537 if (proc != NULL) 538 PRELE(proc); 539 540 if (error) { 541 sbuf_delete(sb); 542 PFS_RETURN (error); 543 } 544 545 sbuf_finish(sb); 546 error = uiomove_frombuf(sbuf_data(sb), sbuf_len(sb), uio); 547 sbuf_delete(sb); 548 PFS_RETURN (error); 549 } 550 551 /* 552 * Iterate through directory entries 553 */ 554 static int 555 pfs_iterate(struct thread *td, struct proc *proc, struct pfs_node *pd, 556 struct pfs_node **pn, struct proc **p) 557 { 558 int visible; 559 560 sx_assert(&allproc_lock, SX_SLOCKED); 561 pfs_assert_owned(pd); 562 again: 563 if (*pn == NULL) { 564 /* first node */ 565 *pn = pd->pn_nodes; 566 } else if ((*pn)->pn_type != pfstype_procdir) { 567 /* next node */ 568 *pn = (*pn)->pn_next; 569 } 570 if (*pn != NULL && (*pn)->pn_type == pfstype_procdir) { 571 /* next process */ 572 if (*p == NULL) 573 *p = LIST_FIRST(&allproc); 574 else 575 *p = LIST_NEXT(*p, p_list); 576 /* out of processes: next node */ 577 if (*p == NULL) 578 *pn = (*pn)->pn_next; 579 else 580 PROC_LOCK(*p); 581 } 582 583 if ((*pn) == NULL) 584 return (-1); 585 586 if (*p != NULL) { 587 visible = pfs_visible_proc(td, *pn, *p); 588 PROC_UNLOCK(*p); 589 } else if (proc != NULL) { 590 visible = pfs_visible_proc(td, *pn, proc); 591 } else { 592 visible = 1; 593 } 594 if (!visible) 595 goto again; 596 597 return (0); 598 } 599 600 /* 601 * Return directory entries. 602 */ 603 static int 604 pfs_readdir(struct vop_readdir_args *va) 605 { 606 struct vnode *vn = va->a_vp; 607 struct pfs_vdata *pvd = vn->v_data; 608 struct pfs_node *pd = pvd->pvd_pn; 609 pid_t pid = pvd->pvd_pid; 610 struct proc *p, *proc; 611 struct pfs_node *pn; 612 struct dirent *entry; 613 struct uio *uio; 614 off_t offset; 615 int error, i, resid; 616 char *buf, *ent; 617 618 KASSERT(pd->pn_info == vn->v_mount->mnt_data, 619 ("%s(): pn_info does not match mountpoint", __func__)); 620 PFS_TRACE(("%s pid %lu", pd->pn_name, (unsigned long)pid)); 621 pfs_assert_not_owned(pd); 622 623 if (vn->v_type != VDIR) 624 PFS_RETURN (ENOTDIR); 625 uio = va->a_uio; 626 627 /* only allow reading entire entries */ 628 offset = uio->uio_offset; 629 resid = uio->uio_resid; 630 if (offset < 0 || offset % PFS_DELEN != 0 || 631 (resid && resid < PFS_DELEN)) 632 PFS_RETURN (EINVAL); 633 if (resid == 0) 634 PFS_RETURN (0); 635 636 /* can't do this while holding the proc lock... */ 637 buf = malloc(resid, M_IOV, M_WAITOK | M_ZERO); 638 sx_slock(&allproc_lock); 639 pfs_lock(pd); 640 641 /* check if the directory is visible to the caller */ 642 if (!pfs_visible(curthread, pd, pid, &proc)) { 643 sx_sunlock(&allproc_lock); 644 pfs_unlock(pd); 645 free(buf, M_IOV); 646 PFS_RETURN (ENOENT); 647 } 648 KASSERT(pid == NO_PID || proc != NULL, 649 ("%s(): no process for pid %lu", __func__, (unsigned long)pid)); 650 651 /* skip unwanted entries */ 652 for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) { 653 if (pfs_iterate(curthread, proc, pd, &pn, &p) == -1) { 654 /* nothing left... */ 655 if (proc != NULL) 656 PROC_UNLOCK(proc); 657 pfs_unlock(pd); 658 sx_sunlock(&allproc_lock); 659 free(buf, M_IOV); 660 PFS_RETURN (0); 661 } 662 } 663 664 /* fill in entries */ 665 ent = buf; 666 while (pfs_iterate(curthread, proc, pd, &pn, &p) != -1 && 667 resid >= PFS_DELEN) { 668 entry = (struct dirent *)ent; 669 entry->d_reclen = PFS_DELEN; 670 entry->d_fileno = pn_fileno(pn, pid); 671 /* PFS_DELEN was picked to fit PFS_NAMLEN */ 672 for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i) 673 entry->d_name[i] = pn->pn_name[i]; 674 entry->d_name[i] = 0; 675 entry->d_namlen = i; 676 switch (pn->pn_type) { 677 case pfstype_procdir: 678 KASSERT(p != NULL, 679 ("reached procdir node with p == NULL")); 680 entry->d_namlen = snprintf(entry->d_name, 681 PFS_NAMELEN, "%d", p->p_pid); 682 /* fall through */ 683 case pfstype_root: 684 case pfstype_dir: 685 case pfstype_this: 686 case pfstype_parent: 687 entry->d_type = DT_DIR; 688 break; 689 case pfstype_file: 690 entry->d_type = DT_REG; 691 break; 692 case pfstype_symlink: 693 entry->d_type = DT_LNK; 694 break; 695 default: 696 panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type); 697 } 698 PFS_TRACE(("%s", entry->d_name)); 699 offset += PFS_DELEN; 700 resid -= PFS_DELEN; 701 ent += PFS_DELEN; 702 } 703 if (proc != NULL) 704 PROC_UNLOCK(proc); 705 pfs_unlock(pd); 706 sx_sunlock(&allproc_lock); 707 PFS_TRACE(("%zd bytes", ent - buf)); 708 error = uiomove(buf, ent - buf, uio); 709 free(buf, M_IOV); 710 PFS_RETURN (error); 711 } 712 713 /* 714 * Read a symbolic link 715 */ 716 static int 717 pfs_readlink(struct vop_readlink_args *va) 718 { 719 struct vnode *vn = va->a_vp; 720 struct pfs_vdata *pvd = vn->v_data; 721 struct pfs_node *pn = pvd->pvd_pn; 722 struct uio *uio = va->a_uio; 723 struct proc *proc = NULL; 724 char buf[PATH_MAX]; 725 struct sbuf sb; 726 int error; 727 728 PFS_TRACE(("%s", pn->pn_name)); 729 pfs_assert_not_owned(pn); 730 731 if (vn->v_type != VLNK) 732 PFS_RETURN (EINVAL); 733 734 if (pn->pn_fill == NULL) 735 PFS_RETURN (EIO); 736 737 if (pvd->pvd_pid != NO_PID) { 738 if ((proc = pfind(pvd->pvd_pid)) == NULL) 739 PFS_RETURN (EIO); 740 if (proc->p_flag & P_WEXIT) { 741 PROC_UNLOCK(proc); 742 PFS_RETURN (EIO); 743 } 744 _PHOLD(proc); 745 PROC_UNLOCK(proc); 746 } 747 748 /* sbuf_new() can't fail with a static buffer */ 749 sbuf_new(&sb, buf, sizeof buf, 0); 750 751 error = pn_fill(curthread, proc, pn, &sb, NULL); 752 753 if (proc != NULL) 754 PRELE(proc); 755 756 if (error) { 757 sbuf_delete(&sb); 758 PFS_RETURN (error); 759 } 760 761 sbuf_finish(&sb); 762 error = uiomove_frombuf(sbuf_data(&sb), sbuf_len(&sb), uio); 763 sbuf_delete(&sb); 764 PFS_RETURN (error); 765 } 766 767 /* 768 * Reclaim a vnode 769 */ 770 static int 771 pfs_reclaim(struct vop_reclaim_args *va) 772 { 773 struct vnode *vn = va->a_vp; 774 struct pfs_vdata *pvd = vn->v_data; 775 struct pfs_node *pn = pvd->pvd_pn; 776 777 PFS_TRACE(("%s", pn->pn_name)); 778 pfs_assert_not_owned(pn); 779 780 return (pfs_vncache_free(va->a_vp)); 781 } 782 783 /* 784 * Set attributes 785 */ 786 static int 787 pfs_setattr(struct vop_setattr_args *va) 788 { 789 struct vnode *vn = va->a_vp; 790 struct pfs_vdata *pvd = vn->v_data; 791 struct pfs_node *pn = pvd->pvd_pn; 792 793 PFS_TRACE(("%s", pn->pn_name)); 794 pfs_assert_not_owned(pn); 795 796 PFS_RETURN (EOPNOTSUPP); 797 } 798 799 /* 800 * Write to a file 801 */ 802 static int 803 pfs_write(struct vop_write_args *va) 804 { 805 struct vnode *vn = va->a_vp; 806 struct pfs_vdata *pvd = vn->v_data; 807 struct pfs_node *pn = pvd->pvd_pn; 808 struct uio *uio = va->a_uio; 809 struct proc *proc; 810 struct sbuf sb; 811 int error; 812 813 PFS_TRACE(("%s", pn->pn_name)); 814 pfs_assert_not_owned(pn); 815 816 if (vn->v_type != VREG) 817 PFS_RETURN (EINVAL); 818 KASSERT(pn->pn_type != pfstype_file, 819 ("%s(): VREG vnode refers to non-file pfs_node", __func__)); 820 821 if (!(pn->pn_flags & PFS_WR)) 822 PFS_RETURN (EBADF); 823 824 if (pn->pn_fill == NULL) 825 PFS_RETURN (EIO); 826 827 /* 828 * This is necessary because either process' privileges may 829 * have changed since the open() call. 830 */ 831 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 832 PFS_RETURN (EIO); 833 if (proc != NULL) { 834 _PHOLD(proc); 835 PROC_UNLOCK(proc); 836 } 837 838 if (pn->pn_flags & PFS_RAWWR) { 839 pfs_lock(pn); 840 error = pn_fill(curthread, proc, pn, NULL, uio); 841 pfs_unlock(pn); 842 if (proc != NULL) 843 PRELE(proc); 844 PFS_RETURN (error); 845 } 846 847 sbuf_uionew(&sb, uio, &error); 848 if (error) { 849 if (proc != NULL) 850 PRELE(proc); 851 PFS_RETURN (error); 852 } 853 854 error = pn_fill(curthread, proc, pn, &sb, uio); 855 856 sbuf_delete(&sb); 857 if (proc != NULL) 858 PRELE(proc); 859 PFS_RETURN (error); 860 } 861 862 /* 863 * Vnode operations 864 */ 865 struct vop_vector pfs_vnodeops = { 866 .vop_default = &default_vnodeops, 867 868 .vop_access = pfs_access, 869 .vop_cachedlookup = pfs_lookup, 870 .vop_close = pfs_close, 871 .vop_create = VOP_EOPNOTSUPP, 872 .vop_getattr = pfs_getattr, 873 .vop_getextattr = pfs_getextattr, 874 .vop_ioctl = pfs_ioctl, 875 .vop_link = VOP_EOPNOTSUPP, 876 .vop_lookup = vfs_cache_lookup, 877 .vop_mkdir = VOP_EOPNOTSUPP, 878 .vop_mknod = VOP_EOPNOTSUPP, 879 .vop_open = pfs_open, 880 .vop_read = pfs_read, 881 .vop_readdir = pfs_readdir, 882 .vop_readlink = pfs_readlink, 883 .vop_reclaim = pfs_reclaim, 884 .vop_remove = VOP_EOPNOTSUPP, 885 .vop_rename = VOP_EOPNOTSUPP, 886 .vop_rmdir = VOP_EOPNOTSUPP, 887 .vop_setattr = pfs_setattr, 888 .vop_symlink = VOP_EOPNOTSUPP, 889 .vop_write = pfs_write, 890 /* XXX I've probably forgotten a few that need VOP_EOPNOTSUPP */ 891 };
Cache object: acc711e9d1f6945ce69c64f42b8d672d
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