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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/6.0/sys/fs/pseudofs/pseudofs_vnops.c 151170 2005-10-09 08:59:34Z delphij $"); 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 #ifdef PSEUDOFS_TRACE 56 static int pfs_trace; 57 SYSCTL_INT(_vfs_pfs, OID_AUTO, trace, CTLFLAG_RW, &pfs_trace, 0, 58 "enable tracing of pseudofs vnode operations"); 59 60 #define PFS_TRACE(foo) \ 61 do { \ 62 if (pfs_trace) { \ 63 printf("%s(): line %d: ", __func__, __LINE__); \ 64 printf foo ; \ 65 printf("\n"); \ 66 } \ 67 } while (0) 68 #define PFS_RETURN(err) \ 69 do { \ 70 if (pfs_trace) { \ 71 printf("%s(): line %d: returning %d\n", \ 72 __func__, __LINE__, err); \ 73 } \ 74 return (err); \ 75 } while (0) 76 #else 77 #define PFS_TRACE(foo) \ 78 do { /* nothing */ } while (0) 79 #define PFS_RETURN(err) \ 80 return (err) 81 #endif 82 83 /* 84 * Returns non-zero if given file is visible to given process 85 */ 86 static int 87 pfs_visible(struct thread *td, struct pfs_node *pn, pid_t pid) 88 { 89 struct proc *proc; 90 int r; 91 92 PFS_TRACE(("%s (pid: %d, req: %d)", 93 pn->pn_name, pid, td->td_proc->p_pid)); 94 95 if (pn->pn_flags & PFS_DISABLED) 96 PFS_RETURN (0); 97 98 r = 1; 99 if (pid != NO_PID) { 100 if ((proc = pfind(pid)) == NULL) 101 PFS_RETURN (0); 102 if (p_cansee(td, proc) != 0 || 103 (pn->pn_vis != NULL && !(pn->pn_vis)(td, proc, pn))) 104 r = 0; 105 PROC_UNLOCK(proc); 106 } 107 PFS_RETURN (r); 108 } 109 110 /* 111 * Verify permissions 112 */ 113 static int 114 pfs_access(struct vop_access_args *va) 115 { 116 struct vnode *vn = va->a_vp; 117 struct vattr vattr; 118 int error; 119 120 PFS_TRACE((((struct pfs_vdata *)vn->v_data)->pvd_pn->pn_name)); 121 122 error = VOP_GETATTR(vn, &vattr, va->a_cred, va->a_td); 123 if (error) 124 PFS_RETURN (error); 125 error = vaccess(vn->v_type, vattr.va_mode, vattr.va_uid, 126 vattr.va_gid, va->a_mode, va->a_cred, NULL); 127 PFS_RETURN (error); 128 } 129 130 /* 131 * Close a file or directory 132 */ 133 static int 134 pfs_close(struct vop_close_args *va) 135 { 136 struct vnode *vn = va->a_vp; 137 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 138 struct pfs_node *pn = pvd->pvd_pn; 139 struct proc *proc; 140 int error; 141 142 PFS_TRACE((pn->pn_name)); 143 144 /* 145 * Do nothing unless this is the last close and the node has a 146 * last-close handler. 147 */ 148 if (vrefcnt(vn) > 1 || pn->pn_close == NULL) 149 PFS_RETURN (0); 150 151 if (pvd->pvd_pid != NO_PID) 152 proc = pfind(pvd->pvd_pid); 153 else 154 proc = NULL; 155 156 error = (pn->pn_close)(va->a_td, proc, pn); 157 158 if (proc != NULL) 159 PROC_UNLOCK(proc); 160 161 PFS_RETURN (error); 162 } 163 164 /* 165 * Get file attributes 166 */ 167 static int 168 pfs_getattr(struct vop_getattr_args *va) 169 { 170 struct vnode *vn = va->a_vp; 171 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 172 struct pfs_node *pn = pvd->pvd_pn; 173 struct vattr *vap = va->a_vap; 174 struct proc *proc; 175 int error = 0; 176 177 PFS_TRACE((pn->pn_name)); 178 179 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 180 PFS_RETURN (ENOENT); 181 182 VATTR_NULL(vap); 183 vap->va_type = vn->v_type; 184 vap->va_fileid = pn->pn_fileno; 185 vap->va_flags = 0; 186 vap->va_blocksize = PAGE_SIZE; 187 vap->va_bytes = vap->va_size = 0; 188 vap->va_fsid = vn->v_mount->mnt_stat.f_fsid.val[0]; 189 vap->va_nlink = 1; 190 nanotime(&vap->va_ctime); 191 vap->va_atime = vap->va_mtime = vap->va_ctime; 192 193 switch (pn->pn_type) { 194 case pfstype_procdir: 195 case pfstype_root: 196 case pfstype_dir: 197 vap->va_mode = 0555; 198 break; 199 case pfstype_file: 200 case pfstype_symlink: 201 vap->va_mode = 0444; 202 break; 203 default: 204 printf("shouldn't be here!\n"); 205 vap->va_mode = 0; 206 break; 207 } 208 209 if (pvd->pvd_pid != NO_PID) { 210 if ((proc = pfind(pvd->pvd_pid)) == NULL) 211 PFS_RETURN (ENOENT); 212 vap->va_uid = proc->p_ucred->cr_ruid; 213 vap->va_gid = proc->p_ucred->cr_rgid; 214 if (pn->pn_attr != NULL) 215 error = (pn->pn_attr)(va->a_td, proc, pn, vap); 216 PROC_UNLOCK(proc); 217 } else { 218 vap->va_uid = 0; 219 vap->va_gid = 0; 220 } 221 222 PFS_RETURN (error); 223 } 224 225 /* 226 * Perform an ioctl 227 */ 228 static int 229 pfs_ioctl(struct vop_ioctl_args *va) 230 { 231 struct vnode *vn = va->a_vp; 232 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 233 struct pfs_node *pn = pvd->pvd_pn; 234 struct proc *proc = NULL; 235 int error; 236 237 PFS_TRACE(("%s: %lx", pn->pn_name, va->a_command)); 238 239 if (vn->v_type != VREG) 240 PFS_RETURN (EINVAL); 241 242 if (pn->pn_ioctl == NULL) 243 PFS_RETURN (ENOTTY); 244 245 /* 246 * This is necessary because process' privileges may 247 * have changed since the open() call. 248 */ 249 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 250 PFS_RETURN (EIO); 251 252 /* XXX duplicates bits of pfs_visible() */ 253 if (pvd->pvd_pid != NO_PID) { 254 if ((proc = pfind(pvd->pvd_pid)) == NULL) 255 PFS_RETURN (EIO); 256 _PHOLD(proc); 257 PROC_UNLOCK(proc); 258 } 259 260 error = (pn->pn_ioctl)(curthread, proc, pn, va->a_command, va->a_data); 261 262 if (proc != NULL) 263 PRELE(proc); 264 265 PFS_RETURN (error); 266 } 267 268 /* 269 * Perform getextattr 270 */ 271 static int 272 pfs_getextattr(struct vop_getextattr_args *va) 273 { 274 struct vnode *vn = va->a_vp; 275 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 276 struct pfs_node *pn = pvd->pvd_pn; 277 struct proc *proc = NULL; 278 int error; 279 280 PFS_TRACE((pn->pn_name)); 281 282 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 283 PFS_RETURN (ENOENT); 284 285 if (pn->pn_getextattr == NULL) 286 PFS_RETURN (EOPNOTSUPP); 287 288 /* 289 * This is necessary because either process' privileges may 290 * have changed since the open() call. 291 */ 292 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 293 PFS_RETURN (EIO); 294 295 /* XXX duplicates bits of pfs_visible() */ 296 if (pvd->pvd_pid != NO_PID) { 297 if ((proc = pfind(pvd->pvd_pid)) == NULL) 298 PFS_RETURN (EIO); 299 _PHOLD(proc); 300 PROC_UNLOCK(proc); 301 } 302 303 error = (pn->pn_getextattr)(curthread, proc, pn, va->a_attrnamespace, 304 va->a_name, va->a_uio, va->a_size, va->a_cred); 305 306 if (proc != NULL) 307 PRELE(proc); 308 309 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 = (struct pfs_vdata *)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; 327 328 PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr)); 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 visisble... */ 351 if (!pfs_visible(curthread, pd, pvd->pvd_pid)) 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, ("non-root directory has no parent")); 370 /* 371 * This one is tricky. Descendents of procdir nodes 372 * inherit their parent's process affinity, but 373 * there's no easy reverse mapping. For simplicity, 374 * we assume that if this node is a procdir, its 375 * parent isn't (which is correct as long as 376 * descendents of procdir nodes are never procdir 377 * nodes themselves) 378 */ 379 if (pd->pn_type == pfstype_procdir) 380 pid = NO_PID; 381 pn = pd->pn_parent; 382 goto got_pnode; 383 } 384 385 /* named node */ 386 for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next) 387 if (pn->pn_type == pfstype_procdir) 388 pdn = pn; 389 else if (pn->pn_name[namelen] == '\0' && 390 bcmp(pname, pn->pn_name, namelen) == 0) 391 goto got_pnode; 392 393 /* process dependent node */ 394 if ((pn = pdn) != NULL) { 395 pid = 0; 396 for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i) 397 if ((pid = pid * 10 + pname[i] - '') > PID_MAX) 398 break; 399 if (i == cnp->cn_namelen) 400 goto got_pnode; 401 } 402 403 PFS_RETURN (ENOENT); 404 got_pnode: 405 if (pn != pd->pn_parent && !pn->pn_parent) 406 pn->pn_parent = pd; 407 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) { 408 error = ENOENT; 409 goto failed; 410 } 411 412 error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid); 413 if (error) 414 goto failed; 415 416 if (cnp->cn_flags & ISDOTDOT) 417 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 418 if (cnp->cn_flags & MAKEENTRY) 419 cache_enter(vn, *vpp, cnp); 420 PFS_RETURN (0); 421 failed: 422 if (cnp->cn_flags & ISDOTDOT) 423 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 424 PFS_RETURN(error); 425 } 426 427 /* 428 * Open a file or directory. 429 */ 430 static int 431 pfs_open(struct vop_open_args *va) 432 { 433 struct vnode *vn = va->a_vp; 434 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 435 struct pfs_node *pn = pvd->pvd_pn; 436 int mode = va->a_mode; 437 438 PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode)); 439 440 /* 441 * check if the file is visible to the caller 442 * 443 * XXX Not sure if this is necessary, as the VFS system calls 444 * XXX pfs_lookup() and pfs_access() first, and pfs_lookup() 445 * XXX calls pfs_visible(). There's a race condition here, but 446 * XXX calling pfs_visible() from here doesn't really close it, 447 * XXX and the only consequence of that race is an EIO further 448 * XXX down the line. 449 */ 450 if (!pfs_visible(va->a_td, pn, pvd->pvd_pid)) 451 PFS_RETURN (ENOENT); 452 453 /* check if the requested mode is permitted */ 454 if (((mode & FREAD) && !(mode & PFS_RD)) || 455 ((mode & FWRITE) && !(mode & PFS_WR))) 456 PFS_RETURN (EPERM); 457 458 /* we don't support locking */ 459 if ((mode & O_SHLOCK) || (mode & O_EXLOCK)) 460 PFS_RETURN (EOPNOTSUPP); 461 462 PFS_RETURN (0); 463 } 464 465 /* 466 * Read from a file 467 */ 468 static int 469 pfs_read(struct vop_read_args *va) 470 { 471 struct vnode *vn = va->a_vp; 472 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 473 struct pfs_node *pn = pvd->pvd_pn; 474 struct uio *uio = va->a_uio; 475 struct proc *proc = NULL; 476 struct sbuf *sb = NULL; 477 int error; 478 unsigned int buflen, offset, resid; 479 480 PFS_TRACE((pn->pn_name)); 481 482 if (vn->v_type != VREG) 483 PFS_RETURN (EINVAL); 484 485 if (!(pn->pn_flags & PFS_RD)) 486 PFS_RETURN (EBADF); 487 488 if (pn->pn_func == NULL) 489 PFS_RETURN (EIO); 490 491 /* 492 * This is necessary because either process' privileges may 493 * have changed since the open() call. 494 */ 495 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 496 PFS_RETURN (EIO); 497 498 /* XXX duplicates bits of pfs_visible() */ 499 if (pvd->pvd_pid != NO_PID) { 500 if ((proc = pfind(pvd->pvd_pid)) == NULL) 501 PFS_RETURN (EIO); 502 _PHOLD(proc); 503 PROC_UNLOCK(proc); 504 } 505 506 if (pn->pn_flags & PFS_RAWRD) { 507 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 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) < offset || buflen > INT_MAX) { 518 if (proc != NULL) 519 PRELE(proc); 520 PFS_RETURN (EINVAL); 521 } 522 if (buflen > MAXPHYS) { 523 if (proc != NULL) 524 PRELE(proc); 525 PFS_RETURN (EIO); 526 } 527 sb = sbuf_new(sb, NULL, buflen, 0); 528 if (sb == NULL) { 529 if (proc != NULL) 530 PRELE(proc); 531 PFS_RETURN (EIO); 532 } 533 534 error = (pn->pn_func)(curthread, proc, pn, sb, uio); 535 536 if (proc != NULL) 537 PRELE(proc); 538 539 if (error) { 540 sbuf_delete(sb); 541 PFS_RETURN (error); 542 } 543 544 sbuf_finish(sb); 545 error = uiomove_frombuf(sbuf_data(sb), sbuf_len(sb), uio); 546 sbuf_delete(sb); 547 PFS_RETURN (error); 548 } 549 550 /* 551 * Iterate through directory entries 552 */ 553 static int 554 pfs_iterate(struct thread *td, pid_t pid, struct pfs_node *pd, 555 struct pfs_node **pn, struct proc **p) 556 { 557 sx_assert(&allproc_lock, SX_LOCKED); 558 again: 559 if (*pn == NULL) { 560 /* first node */ 561 *pn = pd->pn_nodes; 562 } else if ((*pn)->pn_type != pfstype_procdir) { 563 /* next node */ 564 *pn = (*pn)->pn_next; 565 } 566 if (*pn != NULL && (*pn)->pn_type == pfstype_procdir) { 567 /* next process */ 568 if (*p == NULL) 569 *p = LIST_FIRST(&allproc); 570 else 571 *p = LIST_NEXT(*p, p_list); 572 /* out of processes: next node */ 573 if (*p == NULL) 574 *pn = (*pn)->pn_next; 575 } 576 577 if ((*pn) == NULL) 578 return (-1); 579 580 if (!pfs_visible(td, *pn, *p ? (*p)->p_pid : pid)) 581 goto again; 582 583 return (0); 584 } 585 586 /* 587 * Return directory entries. 588 */ 589 static int 590 pfs_readdir(struct vop_readdir_args *va) 591 { 592 struct vnode *vn = va->a_vp; 593 struct pfs_info *pi = (struct pfs_info *)vn->v_mount->mnt_data; 594 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 595 struct pfs_node *pd = pvd->pvd_pn; 596 pid_t pid = pvd->pvd_pid; 597 struct pfs_node *pn; 598 struct dirent *entry; 599 struct uio *uio; 600 struct proc *p; 601 off_t offset; 602 int error, i, resid; 603 char *buf, *ent; 604 605 PFS_TRACE((pd->pn_name)); 606 607 if (vn->v_type != VDIR) 608 PFS_RETURN (ENOTDIR); 609 uio = va->a_uio; 610 611 /* check if the directory is visible to the caller */ 612 if (!pfs_visible(curthread, pd, pid)) 613 PFS_RETURN (ENOENT); 614 615 /* only allow reading entire entries */ 616 offset = uio->uio_offset; 617 resid = uio->uio_resid; 618 if (offset < 0 || offset % PFS_DELEN != 0 || 619 (resid && resid < PFS_DELEN)) 620 PFS_RETURN (EINVAL); 621 if (resid == 0) 622 PFS_RETURN (0); 623 624 /* skip unwanted entries */ 625 sx_slock(&allproc_lock); 626 for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) 627 if (pfs_iterate(curthread, pid, pd, &pn, &p) == -1) { 628 /* nothing left... */ 629 sx_sunlock(&allproc_lock); 630 PFS_RETURN (0); 631 } 632 633 /* fill in entries */ 634 ent = buf = malloc(resid, M_IOV, M_WAITOK | M_ZERO); 635 while (pfs_iterate(curthread, pid, pd, &pn, &p) != -1 && 636 resid >= PFS_DELEN) { 637 entry = (struct dirent *)ent; 638 entry->d_reclen = PFS_DELEN; 639 if (!pn->pn_parent) 640 pn->pn_parent = pd; 641 if (!pn->pn_fileno) 642 pfs_fileno_alloc(pi, pn); 643 if (pid != NO_PID) 644 entry->d_fileno = pn->pn_fileno * NO_PID + pid; 645 else 646 entry->d_fileno = pn->pn_fileno; 647 /* PFS_DELEN was picked to fit PFS_NAMLEN */ 648 for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i) 649 entry->d_name[i] = pn->pn_name[i]; 650 entry->d_name[i] = 0; 651 entry->d_namlen = i; 652 switch (pn->pn_type) { 653 case pfstype_procdir: 654 KASSERT(p != NULL, 655 ("reached procdir node with p == NULL")); 656 entry->d_fileno = pn->pn_fileno * NO_PID + p->p_pid; 657 entry->d_namlen = snprintf(entry->d_name, 658 PFS_NAMELEN, "%d", p->p_pid); 659 /* fall through */ 660 case pfstype_root: 661 case pfstype_dir: 662 case pfstype_this: 663 case pfstype_parent: 664 entry->d_type = DT_DIR; 665 break; 666 case pfstype_file: 667 entry->d_type = DT_REG; 668 break; 669 case pfstype_symlink: 670 entry->d_type = DT_LNK; 671 break; 672 default: 673 panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type); 674 } 675 PFS_TRACE((entry->d_name)); 676 offset += PFS_DELEN; 677 resid -= PFS_DELEN; 678 ent += PFS_DELEN; 679 } 680 sx_sunlock(&allproc_lock); 681 error = uiomove(buf, ent - buf, uio); 682 free(buf, M_IOV); 683 PFS_RETURN (error); 684 } 685 686 /* 687 * Read a symbolic link 688 */ 689 static int 690 pfs_readlink(struct vop_readlink_args *va) 691 { 692 struct vnode *vn = va->a_vp; 693 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 694 struct pfs_node *pn = pvd->pvd_pn; 695 struct uio *uio = va->a_uio; 696 struct proc *proc = NULL; 697 char buf[MAXPATHLEN]; 698 struct sbuf sb; 699 int error; 700 701 PFS_TRACE((pn->pn_name)); 702 703 if (vn->v_type != VLNK) 704 PFS_RETURN (EINVAL); 705 706 if (pn->pn_func == NULL) 707 PFS_RETURN (EIO); 708 709 if (pvd->pvd_pid != NO_PID) { 710 if ((proc = pfind(pvd->pvd_pid)) == NULL) 711 PFS_RETURN (EIO); 712 _PHOLD(proc); 713 PROC_UNLOCK(proc); 714 } 715 716 /* sbuf_new() can't fail with a static buffer */ 717 sbuf_new(&sb, buf, sizeof buf, 0); 718 719 error = (pn->pn_func)(curthread, proc, pn, &sb, NULL); 720 721 if (proc != NULL) 722 PRELE(proc); 723 724 if (error) { 725 sbuf_delete(&sb); 726 PFS_RETURN (error); 727 } 728 729 sbuf_finish(&sb); 730 error = uiomove_frombuf(sbuf_data(&sb), sbuf_len(&sb), uio); 731 sbuf_delete(&sb); 732 PFS_RETURN (error); 733 } 734 735 /* 736 * Reclaim a vnode 737 */ 738 static int 739 pfs_reclaim(struct vop_reclaim_args *va) 740 { 741 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 742 743 return (pfs_vncache_free(va->a_vp)); 744 } 745 746 /* 747 * Set attributes 748 */ 749 static int 750 pfs_setattr(struct vop_setattr_args *va) 751 { 752 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 753 754 PFS_RETURN (EOPNOTSUPP); 755 } 756 757 /* 758 * Write to a file 759 */ 760 static int 761 pfs_write(struct vop_write_args *va) 762 { 763 struct vnode *vn = va->a_vp; 764 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 765 struct pfs_node *pn = pvd->pvd_pn; 766 struct uio *uio = va->a_uio; 767 struct proc *proc = NULL; 768 struct sbuf sb; 769 int error; 770 771 PFS_TRACE((pn->pn_name)); 772 773 if (vn->v_type != VREG) 774 PFS_RETURN (EINVAL); 775 776 if (!(pn->pn_flags & PFS_WR)) 777 PFS_RETURN (EBADF); 778 779 if (pn->pn_func == NULL) 780 PFS_RETURN (EIO); 781 782 /* 783 * This is necessary because either process' privileges may 784 * have changed since the open() call. 785 */ 786 if (!pfs_visible(curthread, pn, pvd->pvd_pid)) 787 PFS_RETURN (EIO); 788 789 /* XXX duplicates bits of pfs_visible() */ 790 if (pvd->pvd_pid != NO_PID) { 791 if ((proc = pfind(pvd->pvd_pid)) == NULL) 792 PFS_RETURN (EIO); 793 _PHOLD(proc); 794 PROC_UNLOCK(proc); 795 } 796 797 if (pn->pn_flags & PFS_RAWWR) { 798 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 799 if (proc != NULL) 800 PRELE(proc); 801 PFS_RETURN (error); 802 } 803 804 sbuf_uionew(&sb, uio, &error); 805 if (error) 806 PFS_RETURN (error); 807 808 error = (pn->pn_func)(curthread, proc, pn, &sb, uio); 809 810 if (proc != NULL) 811 PRELE(proc); 812 813 sbuf_delete(&sb); 814 PFS_RETURN (error); 815 } 816 817 /* 818 * Vnode operations 819 */ 820 struct vop_vector pfs_vnodeops = { 821 .vop_default = &default_vnodeops, 822 823 .vop_access = pfs_access, 824 .vop_cachedlookup = pfs_lookup, 825 .vop_close = pfs_close, 826 .vop_create = VOP_EOPNOTSUPP, 827 .vop_getattr = pfs_getattr, 828 .vop_getextattr = pfs_getextattr, 829 .vop_ioctl = pfs_ioctl, 830 .vop_link = VOP_EOPNOTSUPP, 831 .vop_lookup = vfs_cache_lookup, 832 .vop_mkdir = VOP_EOPNOTSUPP, 833 .vop_mknod = VOP_EOPNOTSUPP, 834 .vop_open = pfs_open, 835 .vop_read = pfs_read, 836 .vop_readdir = pfs_readdir, 837 .vop_readlink = pfs_readlink, 838 .vop_reclaim = pfs_reclaim, 839 .vop_remove = VOP_EOPNOTSUPP, 840 .vop_rename = VOP_EOPNOTSUPP, 841 .vop_rmdir = VOP_EOPNOTSUPP, 842 .vop_setattr = pfs_setattr, 843 .vop_symlink = VOP_EOPNOTSUPP, 844 .vop_write = pfs_write, 845 /* XXX I've probably forgotten a few that need VOP_EOPNOTSUPP */ 846 };
Cache object: 94c222add2ce16dd9c2c59d0d9ffe98d
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