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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/6.1/sys/fs/pseudofs/pseudofs_vnops.c 156401 2006-03-07 18:08:09Z jhb $"); 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. If the 'p' 85 * parameter is non-NULL, then it will hold a pointer to the process the 86 * given file belongs to on return and the process will be locked. 87 */ 88 static int 89 pfs_visible(struct thread *td, struct pfs_node *pn, pid_t pid, struct proc **p) 90 { 91 struct proc *proc; 92 93 PFS_TRACE(("%s (pid: %d, req: %d)", 94 pn->pn_name, pid, td->td_proc->p_pid)); 95 96 if (pn->pn_flags & PFS_DISABLED) 97 PFS_RETURN (0); 98 99 if (pid != NO_PID) { 100 if ((proc = pfind(pid)) == NULL) 101 PFS_RETURN (0); 102 if (proc->p_flag & P_WEXIT) { 103 PROC_UNLOCK(proc); 104 PFS_RETURN (0); 105 } 106 if (p_cansee(td, proc) != 0 || 107 (pn->pn_vis != NULL && !(pn->pn_vis)(td, proc, pn))) { 108 PROC_UNLOCK(proc); 109 PFS_RETURN (0); 110 } 111 if (p) { 112 /* We return with the process locked to avoid races. */ 113 *p = proc; 114 } else 115 PROC_UNLOCK(proc); 116 } else 117 if (p) 118 *p = NULL; 119 PFS_RETURN (1); 120 } 121 122 /* 123 * Verify permissions 124 */ 125 static int 126 pfs_access(struct vop_access_args *va) 127 { 128 struct vnode *vn = va->a_vp; 129 struct vattr vattr; 130 int error; 131 132 PFS_TRACE((((struct pfs_vdata *)vn->v_data)->pvd_pn->pn_name)); 133 134 error = VOP_GETATTR(vn, &vattr, va->a_cred, va->a_td); 135 if (error) 136 PFS_RETURN (error); 137 error = vaccess(vn->v_type, vattr.va_mode, vattr.va_uid, 138 vattr.va_gid, va->a_mode, va->a_cred, NULL); 139 PFS_RETURN (error); 140 } 141 142 /* 143 * Close a file or directory 144 */ 145 static int 146 pfs_close(struct vop_close_args *va) 147 { 148 struct vnode *vn = va->a_vp; 149 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 150 struct pfs_node *pn = pvd->pvd_pn; 151 struct proc *proc; 152 int error; 153 154 PFS_TRACE((pn->pn_name)); 155 156 /* 157 * Do nothing unless this is the last close and the node has a 158 * last-close handler. 159 */ 160 if (vrefcnt(vn) > 1 || pn->pn_close == NULL) 161 PFS_RETURN (0); 162 163 if (pvd->pvd_pid != NO_PID) 164 proc = pfind(pvd->pvd_pid); 165 else 166 proc = NULL; 167 168 error = (pn->pn_close)(va->a_td, proc, pn); 169 170 if (proc != NULL) 171 PROC_UNLOCK(proc); 172 173 PFS_RETURN (error); 174 } 175 176 /* 177 * Get file attributes 178 */ 179 static int 180 pfs_getattr(struct vop_getattr_args *va) 181 { 182 struct vnode *vn = va->a_vp; 183 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 184 struct pfs_node *pn = pvd->pvd_pn; 185 struct vattr *vap = va->a_vap; 186 struct proc *proc; 187 int error = 0; 188 189 PFS_TRACE((pn->pn_name)); 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->pn_fileno; 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 vap->va_mode = 0555; 210 break; 211 case pfstype_file: 212 case pfstype_symlink: 213 vap->va_mode = 0444; 214 break; 215 default: 216 printf("shouldn't be here!\n"); 217 vap->va_mode = 0; 218 break; 219 } 220 221 if (proc != NULL) { 222 vap->va_uid = proc->p_ucred->cr_ruid; 223 vap->va_gid = proc->p_ucred->cr_rgid; 224 if (pn->pn_attr != NULL) 225 error = (pn->pn_attr)(va->a_td, proc, pn, vap); 226 PROC_UNLOCK(proc); 227 } else { 228 vap->va_uid = 0; 229 vap->va_gid = 0; 230 } 231 232 PFS_RETURN (error); 233 } 234 235 /* 236 * Perform an ioctl 237 */ 238 static int 239 pfs_ioctl(struct vop_ioctl_args *va) 240 { 241 struct vnode *vn = va->a_vp; 242 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 243 struct pfs_node *pn = pvd->pvd_pn; 244 struct proc *proc; 245 int error; 246 247 PFS_TRACE(("%s: %lx", pn->pn_name, va->a_command)); 248 249 if (vn->v_type != VREG) 250 PFS_RETURN (EINVAL); 251 252 if (pn->pn_ioctl == NULL) 253 PFS_RETURN (ENOTTY); 254 255 /* 256 * This is necessary because process' privileges may 257 * have changed since the open() call. 258 */ 259 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 260 PFS_RETURN (EIO); 261 262 if (proc != NULL) { 263 _PHOLD(proc); 264 PROC_UNLOCK(proc); 265 } 266 267 error = (pn->pn_ioctl)(curthread, proc, pn, va->a_command, va->a_data); 268 269 if (proc != NULL) 270 PRELE(proc); 271 272 PFS_RETURN (error); 273 } 274 275 /* 276 * Perform getextattr 277 */ 278 static int 279 pfs_getextattr(struct vop_getextattr_args *va) 280 { 281 struct vnode *vn = va->a_vp; 282 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 283 struct pfs_node *pn = pvd->pvd_pn; 284 struct proc *proc; 285 int error; 286 287 PFS_TRACE((pn->pn_name)); 288 289 /* 290 * This is necessary because either process' privileges may 291 * have changed since the open() call. 292 */ 293 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 294 PFS_RETURN (EIO); 295 296 if (pn->pn_getextattr == NULL) { 297 if (proc != NULL) 298 PROC_UNLOCK(proc); 299 PFS_RETURN (EOPNOTSUPP); 300 } 301 302 if (proc != NULL) { 303 _PHOLD(proc); 304 PROC_UNLOCK(proc); 305 } 306 307 error = (pn->pn_getextattr)(curthread, proc, pn, va->a_attrnamespace, 308 va->a_name, va->a_uio, va->a_size, va->a_cred); 309 310 if (proc != NULL) 311 PRELE(proc); 312 313 PFS_RETURN (error); 314 } 315 316 /* 317 * Look up a file or directory 318 */ 319 static int 320 pfs_lookup(struct vop_cachedlookup_args *va) 321 { 322 struct vnode *vn = va->a_dvp; 323 struct vnode **vpp = va->a_vpp; 324 struct componentname *cnp = va->a_cnp; 325 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 326 struct pfs_node *pd = pvd->pvd_pn; 327 struct pfs_node *pn, *pdn = NULL; 328 pid_t pid = pvd->pvd_pid; 329 char *pname; 330 int error, i, namelen; 331 332 PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr)); 333 334 if (vn->v_type != VDIR) 335 PFS_RETURN (ENOTDIR); 336 337 error = VOP_ACCESS(vn, VEXEC, cnp->cn_cred, cnp->cn_thread); 338 if (error) 339 PFS_RETURN (error); 340 341 /* 342 * Don't support DELETE or RENAME. CREATE is supported so 343 * that O_CREAT will work, but the lookup will still fail if 344 * the file does not exist. 345 */ 346 if ((cnp->cn_flags & ISLASTCN) && 347 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 348 PFS_RETURN (EOPNOTSUPP); 349 350 /* shortcut: check if the name is too long */ 351 if (cnp->cn_namelen >= PFS_NAMELEN) 352 PFS_RETURN (ENOENT); 353 354 /* check that parent directory is visible... */ 355 if (!pfs_visible(curthread, pd, pvd->pvd_pid, NULL)) 356 PFS_RETURN (ENOENT); 357 358 /* self */ 359 namelen = cnp->cn_namelen; 360 pname = cnp->cn_nameptr; 361 if (namelen == 1 && pname[0] == '.') { 362 pn = pd; 363 *vpp = vn; 364 VREF(vn); 365 PFS_RETURN (0); 366 } 367 368 /* parent */ 369 if (cnp->cn_flags & ISDOTDOT) { 370 if (pd->pn_type == pfstype_root) 371 PFS_RETURN (EIO); 372 VOP_UNLOCK(vn, 0, cnp->cn_thread); 373 KASSERT(pd->pn_parent, ("non-root directory has no parent")); 374 /* 375 * This one is tricky. Descendents of procdir nodes 376 * inherit their parent's process affinity, but 377 * there's no easy reverse mapping. For simplicity, 378 * we assume that if this node is a procdir, its 379 * parent isn't (which is correct as long as 380 * descendents of procdir nodes are never procdir 381 * nodes themselves) 382 */ 383 if (pd->pn_type == pfstype_procdir) 384 pid = NO_PID; 385 pn = pd->pn_parent; 386 goto got_pnode; 387 } 388 389 /* named node */ 390 for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next) 391 if (pn->pn_type == pfstype_procdir) 392 pdn = pn; 393 else if (pn->pn_name[namelen] == '\0' && 394 bcmp(pname, pn->pn_name, namelen) == 0) 395 goto got_pnode; 396 397 /* process dependent node */ 398 if ((pn = pdn) != NULL) { 399 pid = 0; 400 for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i) 401 if ((pid = pid * 10 + pname[i] - '') > PID_MAX) 402 break; 403 if (i == cnp->cn_namelen) 404 goto got_pnode; 405 } 406 407 PFS_RETURN (ENOENT); 408 got_pnode: 409 if (pn != pd->pn_parent && !pn->pn_parent) 410 pn->pn_parent = pd; 411 if (!pfs_visible(curthread, pn, pvd->pvd_pid, NULL)) { 412 error = ENOENT; 413 goto failed; 414 } 415 416 error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid); 417 if (error) 418 goto failed; 419 420 if (cnp->cn_flags & ISDOTDOT) 421 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 422 if (cnp->cn_flags & MAKEENTRY) 423 cache_enter(vn, *vpp, cnp); 424 PFS_RETURN (0); 425 failed: 426 if (cnp->cn_flags & ISDOTDOT) 427 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 428 PFS_RETURN(error); 429 } 430 431 /* 432 * Open a file or directory. 433 */ 434 static int 435 pfs_open(struct vop_open_args *va) 436 { 437 struct vnode *vn = va->a_vp; 438 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 439 struct pfs_node *pn = pvd->pvd_pn; 440 int mode = va->a_mode; 441 442 PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode)); 443 444 /* 445 * check if the file is visible to the caller 446 * 447 * XXX Not sure if this is necessary, as the VFS system calls 448 * XXX pfs_lookup() and pfs_access() first, and pfs_lookup() 449 * XXX calls pfs_visible(). There's a race condition here, but 450 * XXX calling pfs_visible() from here doesn't really close it, 451 * XXX and the only consequence of that race is an EIO further 452 * XXX down the line. 453 */ 454 if (!pfs_visible(va->a_td, pn, pvd->pvd_pid, NULL)) 455 PFS_RETURN (ENOENT); 456 457 /* check if the requested mode is permitted */ 458 if (((mode & FREAD) && !(mode & PFS_RD)) || 459 ((mode & FWRITE) && !(mode & PFS_WR))) 460 PFS_RETURN (EPERM); 461 462 /* we don't support locking */ 463 if ((mode & O_SHLOCK) || (mode & O_EXLOCK)) 464 PFS_RETURN (EOPNOTSUPP); 465 466 PFS_RETURN (0); 467 } 468 469 /* 470 * Read from a file 471 */ 472 static int 473 pfs_read(struct vop_read_args *va) 474 { 475 struct vnode *vn = va->a_vp; 476 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 477 struct pfs_node *pn = pvd->pvd_pn; 478 struct uio *uio = va->a_uio; 479 struct proc *proc; 480 struct sbuf *sb = NULL; 481 int error; 482 unsigned int buflen, offset, resid; 483 484 PFS_TRACE((pn->pn_name)); 485 486 if (vn->v_type != VREG) 487 PFS_RETURN (EINVAL); 488 489 if (!(pn->pn_flags & PFS_RD)) 490 PFS_RETURN (EBADF); 491 492 if (pn->pn_func == NULL) 493 PFS_RETURN (EIO); 494 495 /* 496 * This is necessary because either process' privileges may 497 * have changed since the open() call. 498 */ 499 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 500 PFS_RETURN (EIO); 501 502 if (proc != NULL) { 503 _PHOLD(proc); 504 PROC_UNLOCK(proc); 505 } 506 507 if (pn->pn_flags & PFS_RAWRD) { 508 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 509 if (proc != NULL) 510 PRELE(proc); 511 PFS_RETURN (error); 512 } 513 514 /* Beaucoup sanity checks so we don't ask for bogus allocation. */ 515 if (uio->uio_offset < 0 || uio->uio_resid < 0 || 516 (offset = uio->uio_offset) != uio->uio_offset || 517 (resid = uio->uio_resid) != uio->uio_resid || 518 (buflen = offset + resid) < offset || buflen > INT_MAX) { 519 if (proc != NULL) 520 PRELE(proc); 521 PFS_RETURN (EINVAL); 522 } 523 if (buflen > MAXPHYS) { 524 if (proc != NULL) 525 PRELE(proc); 526 PFS_RETURN (EIO); 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->pn_func)(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, pid_t pid, struct pfs_node *pd, 556 struct pfs_node **pn, struct proc **p) 557 { 558 sx_assert(&allproc_lock, SX_SLOCKED); 559 again: 560 if (*pn == NULL) { 561 /* first node */ 562 *pn = pd->pn_nodes; 563 } else if ((*pn)->pn_type != pfstype_procdir) { 564 /* next node */ 565 *pn = (*pn)->pn_next; 566 } 567 if (*pn != NULL && (*pn)->pn_type == pfstype_procdir) { 568 /* next process */ 569 if (*p == NULL) 570 *p = LIST_FIRST(&allproc); 571 else 572 *p = LIST_NEXT(*p, p_list); 573 /* out of processes: next node */ 574 if (*p == NULL) 575 *pn = (*pn)->pn_next; 576 } 577 578 if ((*pn) == NULL) 579 return (-1); 580 581 if (!pfs_visible(td, *pn, *p ? (*p)->p_pid : pid, NULL)) 582 goto again; 583 584 return (0); 585 } 586 587 /* 588 * Return directory entries. 589 */ 590 static int 591 pfs_readdir(struct vop_readdir_args *va) 592 { 593 struct vnode *vn = va->a_vp; 594 struct pfs_info *pi = (struct pfs_info *)vn->v_mount->mnt_data; 595 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 596 struct pfs_node *pd = pvd->pvd_pn; 597 pid_t pid = pvd->pvd_pid; 598 struct pfs_node *pn; 599 struct dirent *entry; 600 struct uio *uio; 601 struct proc *p; 602 off_t offset; 603 int error, i, resid; 604 char *buf, *ent; 605 606 PFS_TRACE((pd->pn_name)); 607 608 if (vn->v_type != VDIR) 609 PFS_RETURN (ENOTDIR); 610 uio = va->a_uio; 611 612 /* check if the directory is visible to the caller */ 613 if (!pfs_visible(curthread, pd, pid, NULL)) 614 PFS_RETURN (ENOENT); 615 616 /* only allow reading entire entries */ 617 offset = uio->uio_offset; 618 resid = uio->uio_resid; 619 if (offset < 0 || offset % PFS_DELEN != 0 || 620 (resid && resid < PFS_DELEN)) 621 PFS_RETURN (EINVAL); 622 if (resid == 0) 623 PFS_RETURN (0); 624 625 /* skip unwanted entries */ 626 sx_slock(&allproc_lock); 627 for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) 628 if (pfs_iterate(curthread, pid, pd, &pn, &p) == -1) { 629 /* nothing left... */ 630 sx_sunlock(&allproc_lock); 631 PFS_RETURN (0); 632 } 633 634 /* fill in entries */ 635 ent = buf = malloc(resid, M_IOV, M_WAITOK | M_ZERO); 636 while (pfs_iterate(curthread, pid, pd, &pn, &p) != -1 && 637 resid >= PFS_DELEN) { 638 entry = (struct dirent *)ent; 639 entry->d_reclen = PFS_DELEN; 640 if (!pn->pn_parent) 641 pn->pn_parent = pd; 642 if (!pn->pn_fileno) 643 pfs_fileno_alloc(pi, pn); 644 if (pid != NO_PID) 645 entry->d_fileno = pn->pn_fileno * NO_PID + pid; 646 else 647 entry->d_fileno = pn->pn_fileno; 648 /* PFS_DELEN was picked to fit PFS_NAMLEN */ 649 for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i) 650 entry->d_name[i] = pn->pn_name[i]; 651 entry->d_name[i] = 0; 652 entry->d_namlen = i; 653 switch (pn->pn_type) { 654 case pfstype_procdir: 655 KASSERT(p != NULL, 656 ("reached procdir node with p == NULL")); 657 entry->d_fileno = pn->pn_fileno * NO_PID + p->p_pid; 658 entry->d_namlen = snprintf(entry->d_name, 659 PFS_NAMELEN, "%d", p->p_pid); 660 /* fall through */ 661 case pfstype_root: 662 case pfstype_dir: 663 case pfstype_this: 664 case pfstype_parent: 665 entry->d_type = DT_DIR; 666 break; 667 case pfstype_file: 668 entry->d_type = DT_REG; 669 break; 670 case pfstype_symlink: 671 entry->d_type = DT_LNK; 672 break; 673 default: 674 panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type); 675 } 676 PFS_TRACE((entry->d_name)); 677 offset += PFS_DELEN; 678 resid -= PFS_DELEN; 679 ent += PFS_DELEN; 680 } 681 sx_sunlock(&allproc_lock); 682 error = uiomove(buf, ent - buf, uio); 683 free(buf, M_IOV); 684 PFS_RETURN (error); 685 } 686 687 /* 688 * Read a symbolic link 689 */ 690 static int 691 pfs_readlink(struct vop_readlink_args *va) 692 { 693 struct vnode *vn = va->a_vp; 694 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 695 struct pfs_node *pn = pvd->pvd_pn; 696 struct uio *uio = va->a_uio; 697 struct proc *proc = NULL; 698 char buf[MAXPATHLEN]; 699 struct sbuf sb; 700 int error; 701 702 PFS_TRACE((pn->pn_name)); 703 704 if (vn->v_type != VLNK) 705 PFS_RETURN (EINVAL); 706 707 if (pn->pn_func == NULL) 708 PFS_RETURN (EIO); 709 710 if (pvd->pvd_pid != NO_PID) { 711 if ((proc = pfind(pvd->pvd_pid)) == NULL) 712 PFS_RETURN (EIO); 713 if (proc->p_flag & P_WEXIT) { 714 PROC_UNLOCK(proc); 715 PFS_RETURN (EIO); 716 } 717 _PHOLD(proc); 718 PROC_UNLOCK(proc); 719 } 720 721 /* sbuf_new() can't fail with a static buffer */ 722 sbuf_new(&sb, buf, sizeof buf, 0); 723 724 error = (pn->pn_func)(curthread, proc, pn, &sb, NULL); 725 726 if (proc != NULL) 727 PRELE(proc); 728 729 if (error) { 730 sbuf_delete(&sb); 731 PFS_RETURN (error); 732 } 733 734 sbuf_finish(&sb); 735 error = uiomove_frombuf(sbuf_data(&sb), sbuf_len(&sb), uio); 736 sbuf_delete(&sb); 737 PFS_RETURN (error); 738 } 739 740 /* 741 * Reclaim a vnode 742 */ 743 static int 744 pfs_reclaim(struct vop_reclaim_args *va) 745 { 746 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 747 748 return (pfs_vncache_free(va->a_vp)); 749 } 750 751 /* 752 * Set attributes 753 */ 754 static int 755 pfs_setattr(struct vop_setattr_args *va) 756 { 757 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 758 759 PFS_RETURN (EOPNOTSUPP); 760 } 761 762 /* 763 * Write to a file 764 */ 765 static int 766 pfs_write(struct vop_write_args *va) 767 { 768 struct vnode *vn = va->a_vp; 769 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 770 struct pfs_node *pn = pvd->pvd_pn; 771 struct uio *uio = va->a_uio; 772 struct proc *proc; 773 struct sbuf sb; 774 int error; 775 776 PFS_TRACE((pn->pn_name)); 777 778 if (vn->v_type != VREG) 779 PFS_RETURN (EINVAL); 780 781 if (!(pn->pn_flags & PFS_WR)) 782 PFS_RETURN (EBADF); 783 784 if (pn->pn_func == NULL) 785 PFS_RETURN (EIO); 786 787 /* 788 * This is necessary because either process' privileges may 789 * have changed since the open() call. 790 */ 791 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 792 PFS_RETURN (EIO); 793 794 if (proc != NULL) { 795 _PHOLD(proc); 796 PROC_UNLOCK(proc); 797 } 798 799 if (pn->pn_flags & PFS_RAWWR) { 800 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 801 if (proc != NULL) 802 PRELE(proc); 803 PFS_RETURN (error); 804 } 805 806 sbuf_uionew(&sb, uio, &error); 807 if (error) 808 PFS_RETURN (error); 809 810 error = (pn->pn_func)(curthread, proc, pn, &sb, uio); 811 812 if (proc != NULL) 813 PRELE(proc); 814 815 sbuf_delete(&sb); 816 PFS_RETURN (error); 817 } 818 819 /* 820 * Vnode operations 821 */ 822 struct vop_vector pfs_vnodeops = { 823 .vop_default = &default_vnodeops, 824 825 .vop_access = pfs_access, 826 .vop_cachedlookup = pfs_lookup, 827 .vop_close = pfs_close, 828 .vop_create = VOP_EOPNOTSUPP, 829 .vop_getattr = pfs_getattr, 830 .vop_getextattr = pfs_getextattr, 831 .vop_ioctl = pfs_ioctl, 832 .vop_link = VOP_EOPNOTSUPP, 833 .vop_lookup = vfs_cache_lookup, 834 .vop_mkdir = VOP_EOPNOTSUPP, 835 .vop_mknod = VOP_EOPNOTSUPP, 836 .vop_open = pfs_open, 837 .vop_read = pfs_read, 838 .vop_readdir = pfs_readdir, 839 .vop_readlink = pfs_readlink, 840 .vop_reclaim = pfs_reclaim, 841 .vop_remove = VOP_EOPNOTSUPP, 842 .vop_rename = VOP_EOPNOTSUPP, 843 .vop_rmdir = VOP_EOPNOTSUPP, 844 .vop_setattr = pfs_setattr, 845 .vop_symlink = VOP_EOPNOTSUPP, 846 .vop_write = pfs_write, 847 /* XXX I've probably forgotten a few that need VOP_EOPNOTSUPP */ 848 };
Cache object: 0753379b0174e133e18fcfb85f7cacdb
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