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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: src/sys/fs/pseudofs/pseudofs_vnops.c,v 1.45.2.2 2005/04/30 18:40:47 des Exp $ 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/malloc.h> 40 #include <sys/mount.h> 41 #include <sys/mutex.h> 42 #include <sys/namei.h> 43 #include <sys/proc.h> 44 #include <sys/sbuf.h> 45 #include <sys/sx.h> 46 #include <sys/sysctl.h> 47 #include <sys/vnode.h> 48 49 #include <fs/pseudofs/pseudofs.h> 50 #include <fs/pseudofs/pseudofs_internal.h> 51 52 #if 0 53 #define PFS_TRACE(foo) \ 54 do { \ 55 printf("pseudofs: %s(): line %d: ", __func__, __LINE__); \ 56 printf foo ; \ 57 printf("\n"); \ 58 } while (0) 59 #define PFS_RETURN(err) \ 60 do { \ 61 printf("pseudofs: %s(): line %d: returning %d\n", \ 62 __func__, __LINE__, err); \ 63 return (err); \ 64 } while (0) 65 #else 66 #define PFS_TRACE(foo) \ 67 do { /* nothing */ } while (0) 68 #define PFS_RETURN(err) \ 69 return (err) 70 #endif 71 72 /* 73 * Returns non-zero if given file is visible to given process 74 */ 75 static int 76 pfs_visible(struct thread *td, struct pfs_node *pn, pid_t pid) 77 { 78 struct proc *proc; 79 int r; 80 81 PFS_TRACE(("%s (pid: %d, req: %d)", 82 pn->pn_name, pid, td->td_proc->p_pid)); 83 84 if (pn->pn_flags & PFS_DISABLED) 85 PFS_RETURN (0); 86 87 r = 1; 88 if (pid != NO_PID) { 89 if ((proc = pfind(pid)) == NULL) 90 PFS_RETURN (0); 91 if (p_cansee(td, proc) != 0 || 92 (pn->pn_vis != NULL && !(pn->pn_vis)(td, proc, pn))) 93 r = 0; 94 PROC_UNLOCK(proc); 95 } 96 PFS_RETURN (r); 97 } 98 99 /* 100 * Verify permissions 101 */ 102 static int 103 pfs_access(struct vop_access_args *va) 104 { 105 struct vnode *vn = va->a_vp; 106 struct vattr vattr; 107 int error; 108 109 PFS_TRACE((((struct pfs_vdata *)vn->v_data)->pvd_pn->pn_name)); 110 111 error = VOP_GETATTR(vn, &vattr, va->a_cred, va->a_td); 112 if (error) 113 PFS_RETURN (error); 114 error = vaccess(vn->v_type, vattr.va_mode, vattr.va_uid, 115 vattr.va_gid, va->a_mode, va->a_cred, NULL); 116 PFS_RETURN (error); 117 } 118 119 /* 120 * Close a file or directory 121 */ 122 static int 123 pfs_close(struct vop_close_args *va) 124 { 125 struct vnode *vn = va->a_vp; 126 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 127 struct pfs_node *pn = pvd->pvd_pn; 128 struct proc *proc; 129 int error; 130 131 PFS_TRACE((pn->pn_name)); 132 133 /* 134 * Do nothing unless this is the last close and the node has a 135 * last-close handler. 136 */ 137 if (vrefcnt(vn) > 1 || pn->pn_close == NULL) 138 PFS_RETURN (0); 139 140 if (pvd->pvd_pid != NO_PID) 141 proc = pfind(pvd->pvd_pid); 142 else 143 proc = NULL; 144 145 error = (pn->pn_close)(va->a_td, proc, pn); 146 147 if (proc != NULL) 148 PROC_UNLOCK(proc); 149 150 PFS_RETURN (error); 151 } 152 153 /* 154 * Get file attributes 155 */ 156 static int 157 pfs_getattr(struct vop_getattr_args *va) 158 { 159 struct vnode *vn = va->a_vp; 160 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 161 struct pfs_node *pn = pvd->pvd_pn; 162 struct vattr *vap = va->a_vap; 163 struct proc *proc; 164 int error = 0; 165 166 PFS_TRACE((pn->pn_name)); 167 168 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 169 PFS_RETURN (ENOENT); 170 171 VATTR_NULL(vap); 172 vap->va_type = vn->v_type; 173 vap->va_fileid = pn->pn_fileno; 174 vap->va_flags = 0; 175 vap->va_blocksize = PAGE_SIZE; 176 vap->va_bytes = vap->va_size = 0; 177 vap->va_fsid = vn->v_mount->mnt_stat.f_fsid.val[0]; 178 vap->va_nlink = 1; 179 nanotime(&vap->va_ctime); 180 vap->va_atime = vap->va_mtime = vap->va_ctime; 181 182 switch (pn->pn_type) { 183 case pfstype_procdir: 184 case pfstype_root: 185 case pfstype_dir: 186 vap->va_mode = 0555; 187 break; 188 case pfstype_file: 189 case pfstype_symlink: 190 vap->va_mode = 0444; 191 break; 192 default: 193 printf("shouldn't be here!\n"); 194 vap->va_mode = 0; 195 break; 196 } 197 198 if (pvd->pvd_pid != NO_PID) { 199 if ((proc = pfind(pvd->pvd_pid)) == NULL) 200 PFS_RETURN (ENOENT); 201 vap->va_uid = proc->p_ucred->cr_ruid; 202 vap->va_gid = proc->p_ucred->cr_rgid; 203 if (pn->pn_attr != NULL) 204 error = (pn->pn_attr)(va->a_td, proc, pn, vap); 205 PROC_UNLOCK(proc); 206 } else { 207 vap->va_uid = 0; 208 vap->va_gid = 0; 209 } 210 211 PFS_RETURN (error); 212 } 213 214 /* 215 * Perform an ioctl 216 */ 217 static int 218 pfs_ioctl(struct vop_ioctl_args *va) 219 { 220 struct vnode *vn = va->a_vp; 221 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 222 struct pfs_node *pn = pvd->pvd_pn; 223 struct proc *proc = NULL; 224 int error; 225 226 PFS_TRACE(("%s: %lx", pn->pn_name, va->a_command)); 227 228 if (vn->v_type != VREG) 229 PFS_RETURN (EINVAL); 230 231 if (pn->pn_ioctl == NULL) 232 PFS_RETURN (ENOTTY); 233 234 /* 235 * This is necessary because process' privileges may 236 * have changed since the open() call. 237 */ 238 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 239 PFS_RETURN (EIO); 240 241 /* XXX duplicates bits of pfs_visible() */ 242 if (pvd->pvd_pid != NO_PID) { 243 if ((proc = pfind(pvd->pvd_pid)) == NULL) 244 PFS_RETURN (EIO); 245 _PHOLD(proc); 246 PROC_UNLOCK(proc); 247 } 248 249 error = (pn->pn_ioctl)(curthread, proc, pn, va->a_command, va->a_data); 250 251 if (proc != NULL) 252 PRELE(proc); 253 254 PFS_RETURN (error); 255 } 256 257 /* 258 * Perform getextattr 259 */ 260 static int 261 pfs_getextattr(struct vop_getextattr_args *va) 262 { 263 struct vnode *vn = va->a_vp; 264 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 265 struct pfs_node *pn = pvd->pvd_pn; 266 struct proc *proc = NULL; 267 int error; 268 269 PFS_TRACE((pd->pn_name)); 270 271 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 272 PFS_RETURN (ENOENT); 273 274 if (pn->pn_getextattr == NULL) 275 PFS_RETURN (EOPNOTSUPP); 276 277 /* 278 * This is necessary because either process' privileges may 279 * have changed since the open() call. 280 */ 281 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 282 PFS_RETURN (EIO); 283 284 /* XXX duplicates bits of pfs_visible() */ 285 if (pvd->pvd_pid != NO_PID) { 286 if ((proc = pfind(pvd->pvd_pid)) == NULL) 287 PFS_RETURN (EIO); 288 _PHOLD(proc); 289 PROC_UNLOCK(proc); 290 } 291 292 error = (pn->pn_getextattr)(curthread, proc, pn, va->a_attrnamespace, 293 va->a_name, va->a_uio, va->a_size, va->a_cred); 294 295 if (proc != NULL) 296 PRELE(proc); 297 298 PFS_RETURN (error); 299 } 300 301 /* 302 * Look up a file or directory 303 * 304 * XXX NOTE! pfs_lookup() has been hooked into vop_lookup_desc! This 305 * will result in a lookup operation for a vnode which may already be 306 * cached, therefore we have to be careful to purge the VFS cache when 307 * reusing a vnode. 308 * 309 * This code will work, but is not really correct. Normally we would hook 310 * vfs_cache_lookup() into vop_lookup_desc and hook pfs_lookup() into 311 * vop_cachedlookup_desc. 312 */ 313 static int 314 pfs_lookup(struct vop_lookup_args *va) 315 { 316 struct vnode *vn = va->a_dvp; 317 struct vnode **vpp = va->a_vpp; 318 struct componentname *cnp = va->a_cnp; 319 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 320 struct pfs_node *pd = pvd->pvd_pn; 321 struct pfs_node *pn, *pdn = NULL; 322 pid_t pid = pvd->pvd_pid; 323 int lockparent; 324 int wantparent; 325 char *pname; 326 int error, i, namelen; 327 328 PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr)); 329 330 cnp->cn_flags &= ~PDIRUNLOCK; 331 332 if (vn->v_type != VDIR) 333 PFS_RETURN (ENOTDIR); 334 335 /* 336 * Don't support DELETE or RENAME. CREATE is supported so 337 * that O_CREAT will work, but the lookup will still fail if 338 * the file does not exist. 339 */ 340 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 341 PFS_RETURN (EOPNOTSUPP); 342 343 /* shortcut: check if the name is too long */ 344 if (cnp->cn_namelen >= PFS_NAMELEN) 345 PFS_RETURN (ENOENT); 346 347 /* check that parent directory is visisble... */ 348 if (!pfs_visible(curthread, pd, pvd->pvd_pid)) 349 PFS_RETURN (ENOENT); 350 351 lockparent = cnp->cn_flags & LOCKPARENT; 352 wantparent = cnp->cn_flags & (LOCKPARENT | WANTPARENT); 353 354 355 /* self */ 356 namelen = cnp->cn_namelen; 357 pname = cnp->cn_nameptr; 358 if (namelen == 1 && *pname == '.') { 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 cnp->cn_flags |= PDIRUNLOCK; 371 372 KASSERT(pd->pn_parent, ("non-root directory has no parent")); 373 /* 374 * This one is tricky. Descendents of procdir nodes 375 * inherit their parent's process affinity, but 376 * there's no easy reverse mapping. For simplicity, 377 * we assume that if this node is a procdir, its 378 * parent isn't (which is correct as long as 379 * descendents of procdir nodes are never procdir 380 * nodes themselves) 381 */ 382 if (pd->pn_type == pfstype_procdir) 383 pid = NO_PID; 384 pn = pd->pn_parent; 385 goto got_pnode; 386 } 387 388 /* named node */ 389 for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next) 390 if (pn->pn_type == pfstype_procdir) 391 pdn = pn; 392 else if (pn->pn_name[namelen] == '\0' 393 && bcmp(pname, pn->pn_name, namelen) == 0) 394 goto got_pnode; 395 396 /* process dependent node */ 397 if ((pn = pdn) != NULL) { 398 pid = 0; 399 for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i) 400 if ((pid = pid * 10 + pname[i] - '') > PID_MAX) 401 break; 402 if (i == cnp->cn_namelen) 403 goto got_pnode; 404 } 405 406 PFS_RETURN (ENOENT); 407 got_pnode: 408 if (pn != pd->pn_parent && !pn->pn_parent) 409 pn->pn_parent = pd; 410 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 411 PFS_RETURN (ENOENT); 412 413 error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid); 414 if (error) 415 PFS_RETURN (error); 416 417 if ((cnp->cn_flags & ISDOTDOT) && (cnp->cn_flags & ISLASTCN) 418 && lockparent) { 419 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 420 cnp->cn_flags &= ~PDIRUNLOCK; 421 } 422 if (!((lockparent && (cnp->cn_flags & ISLASTCN)) || 423 (cnp->cn_flags & ISDOTDOT))) 424 VOP_UNLOCK(vn, 0, cnp->cn_thread); 425 426 /* 427 * XXX See comment at top of the routine. 428 */ 429 if (cnp->cn_flags & MAKEENTRY) 430 cache_enter(vn, *vpp, cnp); 431 PFS_RETURN (0); 432 } 433 434 /* 435 * Open a file or directory. 436 */ 437 static int 438 pfs_open(struct vop_open_args *va) 439 { 440 struct vnode *vn = va->a_vp; 441 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 442 struct pfs_node *pn = pvd->pvd_pn; 443 int mode = va->a_mode; 444 445 PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode)); 446 447 /* 448 * check if the file is visible to the caller 449 * 450 * XXX Not sure if this is necessary, as the VFS system calls 451 * XXX pfs_lookup() and pfs_access() first, and pfs_lookup() 452 * XXX calls pfs_visible(). There's a race condition here, but 453 * XXX calling pfs_visible() from here doesn't really close it, 454 * XXX and the only consequence of that race is an EIO further 455 * XXX down the line. 456 */ 457 if (!pfs_visible(va->a_td, pn, pvd->pvd_pid)) 458 PFS_RETURN (ENOENT); 459 460 /* check if the requested mode is permitted */ 461 if (((mode & FREAD) && !(mode & PFS_RD)) || 462 ((mode & FWRITE) && !(mode & PFS_WR))) 463 PFS_RETURN (EPERM); 464 465 /* we don't support locking */ 466 if ((mode & O_SHLOCK) || (mode & O_EXLOCK)) 467 PFS_RETURN (EOPNOTSUPP); 468 469 PFS_RETURN (0); 470 } 471 472 /* 473 * Read from a file 474 */ 475 static int 476 pfs_read(struct vop_read_args *va) 477 { 478 struct vnode *vn = va->a_vp; 479 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 480 struct pfs_node *pn = pvd->pvd_pn; 481 struct uio *uio = va->a_uio; 482 struct proc *proc = NULL; 483 struct sbuf *sb = NULL; 484 int error; 485 unsigned int buflen, offset, resid; 486 487 PFS_TRACE((pn->pn_name)); 488 489 if (vn->v_type != VREG) 490 PFS_RETURN (EINVAL); 491 492 if (!(pn->pn_flags & PFS_RD)) 493 PFS_RETURN (EBADF); 494 495 if (pn->pn_func == NULL) 496 PFS_RETURN (EIO); 497 498 /* 499 * This is necessary because either process' privileges may 500 * have changed since the open() call. 501 */ 502 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 503 PFS_RETURN (EIO); 504 505 /* XXX duplicates bits of pfs_visible() */ 506 if (pvd->pvd_pid != NO_PID) { 507 if ((proc = pfind(pvd->pvd_pid)) == NULL) 508 PFS_RETURN (EIO); 509 _PHOLD(proc); 510 PROC_UNLOCK(proc); 511 } 512 513 if (pn->pn_flags & PFS_RAWRD) { 514 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 515 if (proc != NULL) 516 PRELE(proc); 517 PFS_RETURN (error); 518 } 519 520 /* Beaucoup sanity checks so we don't ask for bogus allocation. */ 521 if (uio->uio_offset < 0 || uio->uio_resid < 0 || 522 (offset = uio->uio_offset) != uio->uio_offset || 523 (resid = uio->uio_resid) != uio->uio_resid || 524 (buflen = offset + resid) < offset || buflen > INT_MAX) { 525 if (proc != NULL) 526 PRELE(proc); 527 PFS_RETURN (EINVAL); 528 } 529 if (buflen > MAXPHYS) { 530 if (proc != NULL) 531 PRELE(proc); 532 PFS_RETURN (EIO); 533 } 534 sb = sbuf_new(sb, NULL, buflen, 0); 535 if (sb == NULL) { 536 if (proc != NULL) 537 PRELE(proc); 538 PFS_RETURN (EIO); 539 } 540 541 error = (pn->pn_func)(curthread, proc, pn, sb, uio); 542 543 if (proc != NULL) 544 PRELE(proc); 545 546 if (error) { 547 sbuf_delete(sb); 548 PFS_RETURN (error); 549 } 550 551 sbuf_finish(sb); 552 error = uiomove_frombuf(sbuf_data(sb), sbuf_len(sb), uio); 553 sbuf_delete(sb); 554 PFS_RETURN (error); 555 } 556 557 /* 558 * Iterate through directory entries 559 */ 560 static int 561 pfs_iterate(struct thread *td, pid_t pid, struct pfs_node *pd, 562 struct pfs_node **pn, struct proc **p) 563 { 564 sx_assert(&allproc_lock, SX_LOCKED); 565 again: 566 if (*pn == NULL) { 567 /* first node */ 568 *pn = pd->pn_nodes; 569 } else if ((*pn)->pn_type != pfstype_procdir) { 570 /* next node */ 571 *pn = (*pn)->pn_next; 572 } 573 if (*pn != NULL && (*pn)->pn_type == pfstype_procdir) { 574 /* next process */ 575 if (*p == NULL) 576 *p = LIST_FIRST(&allproc); 577 else 578 *p = LIST_NEXT(*p, p_list); 579 /* out of processes: next node */ 580 if (*p == NULL) 581 *pn = (*pn)->pn_next; 582 } 583 584 if ((*pn) == NULL) 585 return (-1); 586 587 if (!pfs_visible(td, *pn, *p ? (*p)->p_pid : pid)) 588 goto again; 589 590 return (0); 591 } 592 593 /* 594 * Return directory entries. 595 */ 596 static int 597 pfs_readdir(struct vop_readdir_args *va) 598 { 599 struct vnode *vn = va->a_vp; 600 struct pfs_info *pi = (struct pfs_info *)vn->v_mount->mnt_data; 601 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 602 struct pfs_node *pd = pvd->pvd_pn; 603 pid_t pid = pvd->pvd_pid; 604 struct pfs_node *pn; 605 struct dirent entry; 606 struct uio *uio; 607 struct proc *p; 608 off_t offset; 609 int error, i, resid; 610 char *buf, *ent; 611 612 PFS_TRACE((pd->pn_name)); 613 614 if (vn->v_type != VDIR) 615 PFS_RETURN (ENOTDIR); 616 uio = va->a_uio; 617 618 /* check if the directory is visible to the caller */ 619 if (!pfs_visible(curthread, pd, pid)) 620 PFS_RETURN (ENOENT); 621 622 /* only allow reading entire entries */ 623 offset = uio->uio_offset; 624 resid = uio->uio_resid; 625 if (offset < 0 || offset % PFS_DELEN != 0 || 626 (resid && resid < PFS_DELEN)) 627 PFS_RETURN (EINVAL); 628 if (resid == 0) 629 PFS_RETURN (0); 630 631 /* skip unwanted entries */ 632 sx_slock(&allproc_lock); 633 for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) 634 if (pfs_iterate(curthread, pid, pd, &pn, &p) == -1) { 635 /* nothing left... */ 636 sx_sunlock(&allproc_lock); 637 PFS_RETURN (0); 638 } 639 640 /* fill in entries */ 641 ent = buf = malloc(resid, M_IOV, M_WAITOK); 642 entry.d_reclen = PFS_DELEN; 643 while (pfs_iterate(curthread, pid, pd, &pn, &p) != -1 && 644 resid >= PFS_DELEN) { 645 if (!pn->pn_parent) 646 pn->pn_parent = pd; 647 if (!pn->pn_fileno) 648 pfs_fileno_alloc(pi, pn); 649 if (pid != NO_PID) 650 entry.d_fileno = pn->pn_fileno * NO_PID + pid; 651 else 652 entry.d_fileno = pn->pn_fileno; 653 /* PFS_DELEN was picked to fit PFS_NAMLEN */ 654 for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i) 655 entry.d_name[i] = pn->pn_name[i]; 656 entry.d_name[i] = 0; 657 entry.d_namlen = i; 658 switch (pn->pn_type) { 659 case pfstype_procdir: 660 KASSERT(p != NULL, 661 ("reached procdir node with p == NULL")); 662 entry.d_fileno = pn->pn_fileno * NO_PID + p->p_pid; 663 entry.d_namlen = snprintf(entry.d_name, 664 PFS_NAMELEN, "%d", p->p_pid); 665 /* fall through */ 666 case pfstype_root: 667 case pfstype_dir: 668 case pfstype_this: 669 case pfstype_parent: 670 entry.d_type = DT_DIR; 671 break; 672 case pfstype_file: 673 entry.d_type = DT_REG; 674 break; 675 case pfstype_symlink: 676 entry.d_type = DT_LNK; 677 break; 678 default: 679 panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type); 680 } 681 PFS_TRACE((entry.d_name)); 682 bcopy(&entry, ent, PFS_DELEN); /* XXX waste of cycles */ 683 offset += PFS_DELEN; 684 resid -= PFS_DELEN; 685 ent += PFS_DELEN; 686 } 687 sx_sunlock(&allproc_lock); 688 error = uiomove(buf, ent - buf, uio); 689 free(buf, M_IOV); 690 PFS_RETURN (error); 691 } 692 693 /* 694 * Read a symbolic link 695 */ 696 static int 697 pfs_readlink(struct vop_readlink_args *va) 698 { 699 struct vnode *vn = va->a_vp; 700 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 701 struct pfs_node *pn = pvd->pvd_pn; 702 struct uio *uio = va->a_uio; 703 struct proc *proc = NULL; 704 char buf[MAXPATHLEN]; 705 struct sbuf sb; 706 int error; 707 708 PFS_TRACE((pn->pn_name)); 709 710 if (vn->v_type != VLNK) 711 PFS_RETURN (EINVAL); 712 713 if (pn->pn_func == NULL) 714 PFS_RETURN (EIO); 715 716 if (pvd->pvd_pid != NO_PID) { 717 if ((proc = pfind(pvd->pvd_pid)) == NULL) 718 PFS_RETURN (EIO); 719 _PHOLD(proc); 720 PROC_UNLOCK(proc); 721 } 722 723 /* sbuf_new() can't fail with a static buffer */ 724 sbuf_new(&sb, buf, sizeof buf, 0); 725 726 error = (pn->pn_func)(curthread, proc, pn, &sb, NULL); 727 728 if (proc != NULL) 729 PRELE(proc); 730 731 if (error) { 732 sbuf_delete(&sb); 733 PFS_RETURN (error); 734 } 735 736 sbuf_finish(&sb); 737 error = uiomove_frombuf(sbuf_data(&sb), sbuf_len(&sb), uio); 738 sbuf_delete(&sb); 739 PFS_RETURN (error); 740 } 741 742 /* 743 * Reclaim a vnode 744 */ 745 static int 746 pfs_reclaim(struct vop_reclaim_args *va) 747 { 748 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 749 750 return (pfs_vncache_free(va->a_vp)); 751 } 752 753 /* 754 * Set attributes 755 */ 756 static int 757 pfs_setattr(struct vop_setattr_args *va) 758 { 759 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 760 761 PFS_RETURN (EOPNOTSUPP); 762 } 763 764 /* 765 * Write to a file 766 */ 767 static int 768 pfs_write(struct vop_write_args *va) 769 { 770 struct vnode *vn = va->a_vp; 771 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 772 struct pfs_node *pn = pvd->pvd_pn; 773 struct uio *uio = va->a_uio; 774 struct proc *proc = NULL; 775 struct sbuf sb; 776 int error; 777 778 PFS_TRACE((pn->pn_name)); 779 780 if (vn->v_type != VREG) 781 PFS_RETURN (EINVAL); 782 783 if (!(pn->pn_flags & PFS_WR)) 784 PFS_RETURN (EBADF); 785 786 if (pn->pn_func == NULL) 787 PFS_RETURN (EIO); 788 789 /* 790 * This is necessary because either process' privileges may 791 * have changed since the open() call. 792 */ 793 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 794 PFS_RETURN (EIO); 795 796 /* XXX duplicates bits of pfs_visible() */ 797 if (pvd->pvd_pid != NO_PID) { 798 if ((proc = pfind(pvd->pvd_pid)) == NULL) 799 PFS_RETURN (EIO); 800 _PHOLD(proc); 801 PROC_UNLOCK(proc); 802 } 803 804 if (pn->pn_flags & PFS_RAWWR) { 805 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 806 if (proc != NULL) 807 PRELE(proc); 808 PFS_RETURN (error); 809 } 810 811 sbuf_uionew(&sb, uio, &error); 812 if (error) 813 PFS_RETURN (error); 814 815 error = (pn->pn_func)(curthread, proc, pn, &sb, uio); 816 817 if (proc != NULL) 818 PRELE(proc); 819 820 sbuf_delete(&sb); 821 PFS_RETURN (error); 822 } 823 824 /* 825 * Vnode operations 826 */ 827 vop_t **pfs_vnodeop_p; 828 static struct vnodeopv_entry_desc pfs_vnodeop_entries[] = { 829 { &vop_default_desc, (vop_t *)vop_defaultop }, 830 { &vop_access_desc, (vop_t *)pfs_access }, 831 { &vop_close_desc, (vop_t *)pfs_close }, 832 { &vop_create_desc, (vop_t *)vop_eopnotsupp }, 833 { &vop_getattr_desc, (vop_t *)pfs_getattr }, 834 { &vop_getextattr_desc, (vop_t *)pfs_getextattr }, 835 { &vop_ioctl_desc, (vop_t *)pfs_ioctl }, 836 { &vop_link_desc, (vop_t *)vop_eopnotsupp }, 837 { &vop_lookup_desc, (vop_t *)pfs_lookup }, 838 { &vop_mkdir_desc, (vop_t *)vop_eopnotsupp }, 839 { &vop_mknod_desc, (vop_t *)vop_eopnotsupp }, 840 { &vop_open_desc, (vop_t *)pfs_open }, 841 { &vop_read_desc, (vop_t *)pfs_read }, 842 { &vop_readdir_desc, (vop_t *)pfs_readdir }, 843 { &vop_readlink_desc, (vop_t *)pfs_readlink }, 844 { &vop_reclaim_desc, (vop_t *)pfs_reclaim }, 845 { &vop_remove_desc, (vop_t *)vop_eopnotsupp }, 846 { &vop_rename_desc, (vop_t *)vop_eopnotsupp }, 847 { &vop_rmdir_desc, (vop_t *)vop_eopnotsupp }, 848 { &vop_setattr_desc, (vop_t *)pfs_setattr }, 849 { &vop_symlink_desc, (vop_t *)vop_eopnotsupp }, 850 { &vop_write_desc, (vop_t *)pfs_write }, 851 /* XXX I've probably forgotten a few that need vop_eopnotsupp */ 852 { NULL, (vop_t *)NULL } 853 }; 854 855 static struct vnodeopv_desc pfs_vnodeop_opv_desc = 856 { &pfs_vnodeop_p, pfs_vnodeop_entries }; 857 858 VNODEOP_SET(pfs_vnodeop_opv_desc);
Cache object: 1a0c48a68d9d40ad61a29803cc6b9f0a
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