Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/fs/pseudofs/pseudofs_vnops.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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/6.4/sys/fs/pseudofs/pseudofs_vnops.c 172603 2007-10-12 19:38:39Z 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 * 85 */ 86 static uint32_t 87 pfs_fileno(struct pfs_node *pn, pid_t pid) 88 { 89 if (!pn->pn_fileno) 90 pfs_fileno_alloc(pn); 91 if (pid != NO_PID) 92 return (pn->pn_fileno * NO_PID + pid); 93 return (pn->pn_fileno); 94 } 95 96 /* 97 * Returns non-zero if given file is visible to given process. If the 'p' 98 * parameter is non-NULL, then it will hold a pointer to the process the 99 * given file belongs to on return and the process will be locked. 100 */ 101 static int 102 pfs_visible(struct thread *td, struct pfs_node *pn, pid_t pid, struct proc **p) 103 { 104 struct proc *proc; 105 106 PFS_TRACE(("%s (pid: %d, req: %d)", 107 pn->pn_name, pid, td->td_proc->p_pid)); 108 109 if (pn->pn_flags & PFS_DISABLED) 110 PFS_RETURN (0); 111 112 if (pid != NO_PID) { 113 if ((proc = pfind(pid)) == NULL) 114 PFS_RETURN (0); 115 if (proc->p_flag & P_WEXIT) { 116 PROC_UNLOCK(proc); 117 PFS_RETURN (0); 118 } 119 if (p_cansee(td, proc) != 0 || 120 (pn->pn_vis != NULL && !(pn->pn_vis)(td, proc, pn))) { 121 PROC_UNLOCK(proc); 122 PFS_RETURN (0); 123 } 124 if (p) { 125 /* We return with the process locked to avoid races. */ 126 *p = proc; 127 } else 128 PROC_UNLOCK(proc); 129 } else 130 if (p) 131 *p = NULL; 132 PFS_RETURN (1); 133 } 134 135 /* 136 * Verify permissions 137 */ 138 static int 139 pfs_access(struct vop_access_args *va) 140 { 141 struct vnode *vn = va->a_vp; 142 struct vattr vattr; 143 int error; 144 145 PFS_TRACE((((struct pfs_vdata *)vn->v_data)->pvd_pn->pn_name)); 146 147 error = VOP_GETATTR(vn, &vattr, va->a_cred, va->a_td); 148 if (error) 149 PFS_RETURN (error); 150 error = vaccess(vn->v_type, vattr.va_mode, vattr.va_uid, 151 vattr.va_gid, va->a_mode, va->a_cred, NULL); 152 PFS_RETURN (error); 153 } 154 155 /* 156 * Close a file or directory 157 */ 158 static int 159 pfs_close(struct vop_close_args *va) 160 { 161 struct vnode *vn = va->a_vp; 162 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 163 struct pfs_node *pn = pvd->pvd_pn; 164 struct proc *proc; 165 int error; 166 167 PFS_TRACE((pn->pn_name)); 168 169 /* 170 * Do nothing unless this is the last close and the node has a 171 * last-close handler. 172 */ 173 if (vrefcnt(vn) > 1 || pn->pn_close == NULL) 174 PFS_RETURN (0); 175 176 if (pvd->pvd_pid != NO_PID) 177 proc = pfind(pvd->pvd_pid); 178 else 179 proc = NULL; 180 181 error = (pn->pn_close)(va->a_td, proc, pn); 182 183 if (proc != NULL) 184 PROC_UNLOCK(proc); 185 186 PFS_RETURN (error); 187 } 188 189 /* 190 * Get file attributes 191 */ 192 static int 193 pfs_getattr(struct vop_getattr_args *va) 194 { 195 struct vnode *vn = va->a_vp; 196 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 197 struct pfs_node *pn = pvd->pvd_pn; 198 struct vattr *vap = va->a_vap; 199 struct proc *proc; 200 int error = 0; 201 202 PFS_TRACE((pn->pn_name)); 203 204 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 205 PFS_RETURN (ENOENT); 206 207 VATTR_NULL(vap); 208 vap->va_type = vn->v_type; 209 vap->va_fileid = pfs_fileno(pn, pvd->pvd_pid); 210 vap->va_flags = 0; 211 vap->va_blocksize = PAGE_SIZE; 212 vap->va_bytes = vap->va_size = 0; 213 vap->va_fsid = vn->v_mount->mnt_stat.f_fsid.val[0]; 214 vap->va_nlink = 1; 215 nanotime(&vap->va_ctime); 216 vap->va_atime = vap->va_mtime = vap->va_ctime; 217 218 switch (pn->pn_type) { 219 case pfstype_procdir: 220 case pfstype_root: 221 case pfstype_dir: 222 vap->va_mode = 0555; 223 break; 224 case pfstype_file: 225 case pfstype_symlink: 226 vap->va_mode = 0444; 227 break; 228 default: 229 printf("shouldn't be here!\n"); 230 vap->va_mode = 0; 231 break; 232 } 233 234 if (proc != NULL) { 235 vap->va_uid = proc->p_ucred->cr_ruid; 236 vap->va_gid = proc->p_ucred->cr_rgid; 237 if (pn->pn_attr != NULL) 238 error = (pn->pn_attr)(va->a_td, proc, pn, vap); 239 PROC_UNLOCK(proc); 240 } else { 241 vap->va_uid = 0; 242 vap->va_gid = 0; 243 } 244 245 PFS_RETURN (error); 246 } 247 248 /* 249 * Perform an ioctl 250 */ 251 static int 252 pfs_ioctl(struct vop_ioctl_args *va) 253 { 254 struct vnode *vn = va->a_vp; 255 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 256 struct pfs_node *pn = pvd->pvd_pn; 257 struct proc *proc; 258 int error; 259 260 PFS_TRACE(("%s: %lx", pn->pn_name, va->a_command)); 261 262 if (vn->v_type != VREG) 263 PFS_RETURN (EINVAL); 264 265 if (pn->pn_ioctl == NULL) 266 PFS_RETURN (ENOTTY); 267 268 /* 269 * This is necessary because process' privileges may 270 * have changed since the open() call. 271 */ 272 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 273 PFS_RETURN (EIO); 274 275 if (proc != NULL) { 276 _PHOLD(proc); 277 PROC_UNLOCK(proc); 278 } 279 280 error = (pn->pn_ioctl)(curthread, proc, pn, va->a_command, va->a_data); 281 282 if (proc != NULL) 283 PRELE(proc); 284 285 PFS_RETURN (error); 286 } 287 288 /* 289 * Perform getextattr 290 */ 291 static int 292 pfs_getextattr(struct vop_getextattr_args *va) 293 { 294 struct vnode *vn = va->a_vp; 295 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 296 struct pfs_node *pn = pvd->pvd_pn; 297 struct proc *proc; 298 int error; 299 300 PFS_TRACE((pn->pn_name)); 301 302 /* 303 * This is necessary because either process' privileges may 304 * have changed since the open() call. 305 */ 306 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 307 PFS_RETURN (EIO); 308 309 if (pn->pn_getextattr == NULL) { 310 if (proc != NULL) 311 PROC_UNLOCK(proc); 312 PFS_RETURN (EOPNOTSUPP); 313 } 314 315 if (proc != NULL) { 316 _PHOLD(proc); 317 PROC_UNLOCK(proc); 318 } 319 320 error = (pn->pn_getextattr)(curthread, proc, pn, va->a_attrnamespace, 321 va->a_name, va->a_uio, va->a_size, va->a_cred); 322 323 if (proc != NULL) 324 PRELE(proc); 325 326 PFS_RETURN (error); 327 } 328 329 /* 330 * Look up a file or directory 331 */ 332 static int 333 pfs_lookup(struct vop_cachedlookup_args *va) 334 { 335 struct vnode *vn = va->a_dvp; 336 struct vnode **vpp = va->a_vpp; 337 struct componentname *cnp = va->a_cnp; 338 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 339 struct pfs_node *pd = pvd->pvd_pn; 340 struct pfs_node *pn, *pdn = NULL; 341 pid_t pid = pvd->pvd_pid; 342 char *pname; 343 int error, i, namelen; 344 345 PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr)); 346 347 if (vn->v_type != VDIR) 348 PFS_RETURN (ENOTDIR); 349 350 error = VOP_ACCESS(vn, VEXEC, cnp->cn_cred, cnp->cn_thread); 351 if (error) 352 PFS_RETURN (error); 353 354 /* 355 * Don't support DELETE or RENAME. CREATE is supported so 356 * that O_CREAT will work, but the lookup will still fail if 357 * the file does not exist. 358 */ 359 if ((cnp->cn_flags & ISLASTCN) && 360 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 361 PFS_RETURN (EOPNOTSUPP); 362 363 /* shortcut: check if the name is too long */ 364 if (cnp->cn_namelen >= PFS_NAMELEN) 365 PFS_RETURN (ENOENT); 366 367 /* check that parent directory is visible... */ 368 if (!pfs_visible(curthread, pd, pvd->pvd_pid, NULL)) 369 PFS_RETURN (ENOENT); 370 371 /* self */ 372 namelen = cnp->cn_namelen; 373 pname = cnp->cn_nameptr; 374 if (namelen == 1 && pname[0] == '.') { 375 pn = pd; 376 *vpp = vn; 377 VREF(vn); 378 PFS_RETURN (0); 379 } 380 381 /* parent */ 382 if (cnp->cn_flags & ISDOTDOT) { 383 if (pd->pn_type == pfstype_root) 384 PFS_RETURN (EIO); 385 VOP_UNLOCK(vn, 0, cnp->cn_thread); 386 KASSERT(pd->pn_parent, ("non-root directory has no parent")); 387 /* 388 * This one is tricky. Descendents of procdir nodes 389 * inherit their parent's process affinity, but 390 * there's no easy reverse mapping. For simplicity, 391 * we assume that if this node is a procdir, its 392 * parent isn't (which is correct as long as 393 * descendents of procdir nodes are never procdir 394 * nodes themselves) 395 */ 396 if (pd->pn_type == pfstype_procdir) 397 pid = NO_PID; 398 pn = pd->pn_parent; 399 goto got_pnode; 400 } 401 402 /* named node */ 403 for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next) 404 if (pn->pn_type == pfstype_procdir) 405 pdn = pn; 406 else if (pn->pn_name[namelen] == '\0' && 407 bcmp(pname, pn->pn_name, namelen) == 0) 408 goto got_pnode; 409 410 /* process dependent node */ 411 if ((pn = pdn) != NULL) { 412 pid = 0; 413 for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i) 414 if ((pid = pid * 10 + pname[i] - '') > PID_MAX) 415 break; 416 if (i == cnp->cn_namelen) 417 goto got_pnode; 418 } 419 420 PFS_RETURN (ENOENT); 421 got_pnode: 422 if (pn != pd->pn_parent && !pn->pn_parent) 423 pn->pn_parent = pd; 424 if (!pfs_visible(curthread, pn, pid, NULL)) { 425 error = ENOENT; 426 goto failed; 427 } 428 429 error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid); 430 if (error) 431 goto failed; 432 433 if (cnp->cn_flags & ISDOTDOT) 434 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 435 if (cnp->cn_flags & MAKEENTRY) 436 cache_enter(vn, *vpp, cnp); 437 PFS_RETURN (0); 438 failed: 439 if (cnp->cn_flags & ISDOTDOT) 440 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread); 441 PFS_RETURN(error); 442 } 443 444 /* 445 * Open a file or directory. 446 */ 447 static int 448 pfs_open(struct vop_open_args *va) 449 { 450 struct vnode *vn = va->a_vp; 451 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 452 struct pfs_node *pn = pvd->pvd_pn; 453 int mode = va->a_mode; 454 455 PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode)); 456 457 /* 458 * check if the file is visible to the caller 459 * 460 * XXX Not sure if this is necessary, as the VFS system calls 461 * XXX pfs_lookup() and pfs_access() first, and pfs_lookup() 462 * XXX calls pfs_visible(). There's a race condition here, but 463 * XXX calling pfs_visible() from here doesn't really close it, 464 * XXX and the only consequence of that race is an EIO further 465 * XXX down the line. 466 */ 467 if (!pfs_visible(va->a_td, pn, pvd->pvd_pid, NULL)) 468 PFS_RETURN (ENOENT); 469 470 /* check if the requested mode is permitted */ 471 if (((mode & FREAD) && !(mode & PFS_RD)) || 472 ((mode & FWRITE) && !(mode & PFS_WR))) 473 PFS_RETURN (EPERM); 474 475 /* we don't support locking */ 476 if ((mode & O_SHLOCK) || (mode & O_EXLOCK)) 477 PFS_RETURN (EOPNOTSUPP); 478 479 PFS_RETURN (0); 480 } 481 482 /* 483 * Read from a file 484 */ 485 static int 486 pfs_read(struct vop_read_args *va) 487 { 488 struct vnode *vn = va->a_vp; 489 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 490 struct pfs_node *pn = pvd->pvd_pn; 491 struct uio *uio = va->a_uio; 492 struct proc *proc; 493 struct sbuf *sb = NULL; 494 int error; 495 unsigned int buflen, offset, resid; 496 497 PFS_TRACE((pn->pn_name)); 498 499 if (vn->v_type != VREG) 500 PFS_RETURN (EINVAL); 501 502 if (!(pn->pn_flags & PFS_RD)) 503 PFS_RETURN (EBADF); 504 505 if (pn->pn_func == NULL) 506 PFS_RETURN (EIO); 507 508 /* 509 * This is necessary because either process' privileges may 510 * have changed since the open() call. 511 */ 512 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 513 PFS_RETURN (EIO); 514 515 if (proc != NULL) { 516 _PHOLD(proc); 517 PROC_UNLOCK(proc); 518 } 519 520 if (pn->pn_flags & PFS_RAWRD) { 521 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 522 if (proc != NULL) 523 PRELE(proc); 524 PFS_RETURN (error); 525 } 526 527 /* Beaucoup sanity checks so we don't ask for bogus allocation. */ 528 if (uio->uio_offset < 0 || uio->uio_resid < 0 || 529 (offset = uio->uio_offset) != uio->uio_offset || 530 (resid = uio->uio_resid) != uio->uio_resid || 531 (buflen = offset + resid + 1) < offset || buflen > INT_MAX) { 532 if (proc != NULL) 533 PRELE(proc); 534 PFS_RETURN (EINVAL); 535 } 536 if (buflen > MAXPHYS + 1) { 537 if (proc != NULL) 538 PRELE(proc); 539 PFS_RETURN (EIO); 540 } 541 sb = sbuf_new(sb, NULL, buflen, 0); 542 if (sb == NULL) { 543 if (proc != NULL) 544 PRELE(proc); 545 PFS_RETURN (EIO); 546 } 547 548 error = (pn->pn_func)(curthread, proc, pn, sb, uio); 549 550 if (proc != NULL) 551 PRELE(proc); 552 553 if (error) { 554 sbuf_delete(sb); 555 PFS_RETURN (error); 556 } 557 558 sbuf_finish(sb); 559 error = uiomove_frombuf(sbuf_data(sb), sbuf_len(sb), uio); 560 sbuf_delete(sb); 561 PFS_RETURN (error); 562 } 563 564 /* 565 * Iterate through directory entries 566 */ 567 static int 568 pfs_iterate(struct thread *td, pid_t pid, struct pfs_node *pd, 569 struct pfs_node **pn, struct proc **p) 570 { 571 sx_assert(&allproc_lock, SX_SLOCKED); 572 again: 573 if (*pn == NULL) { 574 /* first node */ 575 *pn = pd->pn_nodes; 576 } else if ((*pn)->pn_type != pfstype_procdir) { 577 /* next node */ 578 *pn = (*pn)->pn_next; 579 } 580 if (*pn != NULL && (*pn)->pn_type == pfstype_procdir) { 581 /* next process */ 582 if (*p == NULL) 583 *p = LIST_FIRST(&allproc); 584 else 585 *p = LIST_NEXT(*p, p_list); 586 /* out of processes: next node */ 587 if (*p == NULL) 588 *pn = (*pn)->pn_next; 589 } 590 591 if ((*pn) == NULL) 592 return (-1); 593 594 if (!pfs_visible(td, *pn, *p ? (*p)->p_pid : pid, NULL)) 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 = (struct pfs_vdata *)vn->v_data; 608 struct pfs_node *pd = pvd->pvd_pn; 609 pid_t pid = pvd->pvd_pid; 610 struct pfs_node *pn; 611 struct dirent *entry; 612 struct uio *uio; 613 struct proc *p; 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 ("directory's pn_info does not match mountpoint's mnt_data")); 620 PFS_TRACE((pd->pn_name)); 621 622 if (vn->v_type != VDIR) 623 PFS_RETURN (ENOTDIR); 624 uio = va->a_uio; 625 626 /* check if the directory is visible to the caller */ 627 if (!pfs_visible(curthread, pd, pid, NULL)) 628 PFS_RETURN (ENOENT); 629 630 /* only allow reading entire entries */ 631 offset = uio->uio_offset; 632 resid = uio->uio_resid; 633 if (offset < 0 || offset % PFS_DELEN != 0 || 634 (resid && resid < PFS_DELEN)) 635 PFS_RETURN (EINVAL); 636 if (resid == 0) 637 PFS_RETURN (0); 638 639 /* skip unwanted entries */ 640 sx_slock(&allproc_lock); 641 for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) 642 if (pfs_iterate(curthread, pid, pd, &pn, &p) == -1) { 643 /* nothing left... */ 644 sx_sunlock(&allproc_lock); 645 PFS_RETURN (0); 646 } 647 648 /* fill in entries */ 649 ent = buf = malloc(resid, M_IOV, M_WAITOK | M_ZERO); 650 while (pfs_iterate(curthread, pid, pd, &pn, &p) != -1 && 651 resid >= PFS_DELEN) { 652 entry = (struct dirent *)ent; 653 entry->d_reclen = PFS_DELEN; 654 if (!pn->pn_parent) 655 pn->pn_parent = pd; 656 entry->d_fileno = pfs_fileno(pn, pid); 657 /* PFS_DELEN was picked to fit PFS_NAMLEN */ 658 for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i) 659 entry->d_name[i] = pn->pn_name[i]; 660 entry->d_name[i] = 0; 661 entry->d_namlen = i; 662 switch (pn->pn_type) { 663 case pfstype_procdir: 664 KASSERT(p != NULL, 665 ("reached procdir node with p == NULL")); 666 entry->d_namlen = snprintf(entry->d_name, 667 PFS_NAMELEN, "%d", p->p_pid); 668 /* fall through */ 669 case pfstype_root: 670 case pfstype_dir: 671 case pfstype_this: 672 case pfstype_parent: 673 entry->d_type = DT_DIR; 674 break; 675 case pfstype_file: 676 entry->d_type = DT_REG; 677 break; 678 case pfstype_symlink: 679 entry->d_type = DT_LNK; 680 break; 681 default: 682 panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type); 683 } 684 PFS_TRACE((entry->d_name)); 685 offset += PFS_DELEN; 686 resid -= PFS_DELEN; 687 ent += PFS_DELEN; 688 } 689 sx_sunlock(&allproc_lock); 690 error = uiomove(buf, ent - buf, uio); 691 free(buf, M_IOV); 692 PFS_RETURN (error); 693 } 694 695 /* 696 * Read a symbolic link 697 */ 698 static int 699 pfs_readlink(struct vop_readlink_args *va) 700 { 701 struct vnode *vn = va->a_vp; 702 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 703 struct pfs_node *pn = pvd->pvd_pn; 704 struct uio *uio = va->a_uio; 705 struct proc *proc = NULL; 706 char buf[MAXPATHLEN]; 707 struct sbuf sb; 708 int error; 709 710 PFS_TRACE((pn->pn_name)); 711 712 if (vn->v_type != VLNK) 713 PFS_RETURN (EINVAL); 714 715 if (pn->pn_func == NULL) 716 PFS_RETURN (EIO); 717 718 if (pvd->pvd_pid != NO_PID) { 719 if ((proc = pfind(pvd->pvd_pid)) == NULL) 720 PFS_RETURN (EIO); 721 if (proc->p_flag & P_WEXIT) { 722 PROC_UNLOCK(proc); 723 PFS_RETURN (EIO); 724 } 725 _PHOLD(proc); 726 PROC_UNLOCK(proc); 727 } 728 729 /* sbuf_new() can't fail with a static buffer */ 730 sbuf_new(&sb, buf, sizeof buf, 0); 731 732 error = (pn->pn_func)(curthread, proc, pn, &sb, NULL); 733 734 if (proc != NULL) 735 PRELE(proc); 736 737 if (error) { 738 sbuf_delete(&sb); 739 PFS_RETURN (error); 740 } 741 742 sbuf_finish(&sb); 743 error = uiomove_frombuf(sbuf_data(&sb), sbuf_len(&sb), uio); 744 sbuf_delete(&sb); 745 PFS_RETURN (error); 746 } 747 748 /* 749 * Reclaim a vnode 750 */ 751 static int 752 pfs_reclaim(struct vop_reclaim_args *va) 753 { 754 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 755 756 return (pfs_vncache_free(va->a_vp)); 757 } 758 759 /* 760 * Set attributes 761 */ 762 static int 763 pfs_setattr(struct vop_setattr_args *va) 764 { 765 PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name)); 766 767 PFS_RETURN (EOPNOTSUPP); 768 } 769 770 /* 771 * Write to a file 772 */ 773 static int 774 pfs_write(struct vop_write_args *va) 775 { 776 struct vnode *vn = va->a_vp; 777 struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data; 778 struct pfs_node *pn = pvd->pvd_pn; 779 struct uio *uio = va->a_uio; 780 struct proc *proc; 781 struct sbuf sb; 782 int error; 783 784 PFS_TRACE((pn->pn_name)); 785 786 if (vn->v_type != VREG) 787 PFS_RETURN (EINVAL); 788 789 if (!(pn->pn_flags & PFS_WR)) 790 PFS_RETURN (EBADF); 791 792 if (pn->pn_func == NULL) 793 PFS_RETURN (EIO); 794 795 /* 796 * This is necessary because either process' privileges may 797 * have changed since the open() call. 798 */ 799 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) 800 PFS_RETURN (EIO); 801 802 if (proc != NULL) { 803 _PHOLD(proc); 804 PROC_UNLOCK(proc); 805 } 806 807 if (pn->pn_flags & PFS_RAWWR) { 808 error = (pn->pn_func)(curthread, proc, pn, NULL, uio); 809 if (proc != NULL) 810 PRELE(proc); 811 PFS_RETURN (error); 812 } 813 814 sbuf_uionew(&sb, uio, &error); 815 if (error) 816 PFS_RETURN (error); 817 818 error = (pn->pn_func)(curthread, proc, pn, &sb, uio); 819 820 if (proc != NULL) 821 PRELE(proc); 822 823 sbuf_delete(&sb); 824 PFS_RETURN (error); 825 } 826 827 /* 828 * Vnode operations 829 */ 830 struct vop_vector pfs_vnodeops = { 831 .vop_default = &default_vnodeops, 832 833 .vop_access = pfs_access, 834 .vop_cachedlookup = pfs_lookup, 835 .vop_close = pfs_close, 836 .vop_create = VOP_EOPNOTSUPP, 837 .vop_getattr = pfs_getattr, 838 .vop_getextattr = pfs_getextattr, 839 .vop_ioctl = pfs_ioctl, 840 .vop_link = VOP_EOPNOTSUPP, 841 .vop_lookup = vfs_cache_lookup, 842 .vop_mkdir = VOP_EOPNOTSUPP, 843 .vop_mknod = VOP_EOPNOTSUPP, 844 .vop_open = pfs_open, 845 .vop_read = pfs_read, 846 .vop_readdir = pfs_readdir, 847 .vop_readlink = pfs_readlink, 848 .vop_reclaim = pfs_reclaim, 849 .vop_remove = VOP_EOPNOTSUPP, 850 .vop_rename = VOP_EOPNOTSUPP, 851 .vop_rmdir = VOP_EOPNOTSUPP, 852 .vop_setattr = pfs_setattr, 853 .vop_symlink = VOP_EOPNOTSUPP, 854 .vop_write = pfs_write, 855 /* XXX I've probably forgotten a few that need VOP_EOPNOTSUPP */ 856 };
Cache object: c14c06f18bd91af02cd11d78cd42a98b
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]