vfs_vnops.c revision 1.86.2.10
1 /* $NetBSD: vfs_vnops.c,v 1.86.2.10 2005/11/09 12:25:15 tron Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vfs_vnops.c 8.14 (Berkeley) 6/15/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: vfs_vnops.c,v 1.86.2.10 2005/11/09 12:25:15 tron Exp $"); 41 42 #include "opt_verified_exec.h" 43 44 #include "fs_union.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/file.h> 50 #include <sys/stat.h> 51 #include <sys/buf.h> 52 #include <sys/proc.h> 53 #include <sys/malloc.h> 54 #include <sys/mount.h> 55 #include <sys/namei.h> 56 #include <sys/vnode.h> 57 #include <sys/ioctl.h> 58 #include <sys/tty.h> 59 #include <sys/poll.h> 60 61 #include <miscfs/specfs/specdev.h> 62 63 #include <uvm/uvm_extern.h> 64 65 #ifdef UNION 66 #include <fs/union/union.h> 67 #endif 68 69 #if defined(LKM) || defined(UNION) 70 int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct proc *); 71 #endif 72 73 #ifdef VERIFIED_EXEC 74 #include <sys/verified_exec.h> 75 #endif 76 77 static int vn_read(struct file *fp, off_t *offset, struct uio *uio, 78 struct ucred *cred, int flags); 79 static int vn_write(struct file *fp, off_t *offset, struct uio *uio, 80 struct ucred *cred, int flags); 81 static int vn_closefile(struct file *fp, struct proc *p); 82 static int vn_poll(struct file *fp, int events, struct proc *p); 83 static int vn_fcntl(struct file *fp, u_int com, void *data, struct proc *p); 84 static int vn_statfile(struct file *fp, struct stat *sb, struct proc *p); 85 static int vn_ioctl(struct file *fp, u_long com, void *data, struct proc *p); 86 87 const struct fileops vnops = { 88 vn_read, vn_write, vn_ioctl, vn_fcntl, vn_poll, 89 vn_statfile, vn_closefile, vn_kqfilter 90 }; 91 92 /* 93 * Common code for vnode open operations. 94 * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. 95 */ 96 int 97 vn_open(ndp, fmode, cmode) 98 struct nameidata *ndp; 99 int fmode, cmode; 100 { 101 struct vnode *vp; 102 struct mount *mp; 103 struct proc *p = ndp->ni_cnd.cn_proc; 104 struct ucred *cred = p->p_ucred; 105 struct vattr va; 106 int error; 107 #ifdef VERIFIED_EXEC 108 struct veriexec_hash_entry *vhe = NULL; 109 char pathbuf[MAXPATHLEN]; 110 size_t pathlen; 111 int (*copyfun)(const void *, void *, size_t, size_t *) = 112 ndp->ni_segflg == UIO_SYSSPACE ? copystr : copyinstr; 113 #endif /* VERIFIED_EXEC */ 114 115 #ifdef VERIFIED_EXEC 116 error = (*copyfun)(ndp->ni_dirp, pathbuf, sizeof(pathbuf), &pathlen); 117 if (error) { 118 if (veriexec_verbose >= 1) 119 printf("veriexec: Can't copy path. (error=%d)\n", 120 error); 121 122 return (error); 123 } 124 #endif /* VERIFIED_EXEC */ 125 126 restart: 127 if (fmode & O_CREAT) { 128 ndp->ni_cnd.cn_nameiop = CREATE; 129 ndp->ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF; 130 if ((fmode & O_EXCL) == 0 && 131 ((fmode & O_NOFOLLOW) == 0)) 132 ndp->ni_cnd.cn_flags |= FOLLOW; 133 if ((error = namei(ndp)) != 0) 134 return (error); 135 if (ndp->ni_vp == NULL) { 136 #ifdef VERIFIED_EXEC 137 /* Lockdown mode: Prevent creation of new files. */ 138 if (veriexec_strict >= 3) { 139 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 140 141 printf("Veriexec: vn_open: Preventing " 142 "new file creation in %s.\n", 143 pathbuf); 144 145 vp = ndp->ni_dvp; 146 error = EPERM; 147 goto bad; 148 } 149 #endif /* VERIFIED_EXEC */ 150 151 VATTR_NULL(&va); 152 va.va_type = VREG; 153 va.va_mode = cmode; 154 if (fmode & O_EXCL) 155 va.va_vaflags |= VA_EXCLUSIVE; 156 if (vn_start_write(ndp->ni_dvp, &mp, V_NOWAIT) != 0) { 157 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 158 vput(ndp->ni_dvp); 159 if ((error = vn_start_write(NULL, &mp, 160 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 161 return (error); 162 goto restart; 163 } 164 VOP_LEASE(ndp->ni_dvp, p, cred, LEASE_WRITE); 165 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, 166 &ndp->ni_cnd, &va); 167 vn_finished_write(mp, 0); 168 if (error) 169 return (error); 170 fmode &= ~O_TRUNC; 171 vp = ndp->ni_vp; 172 } else { 173 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 174 if (ndp->ni_dvp == ndp->ni_vp) 175 vrele(ndp->ni_dvp); 176 else 177 vput(ndp->ni_dvp); 178 ndp->ni_dvp = NULL; 179 vp = ndp->ni_vp; 180 if (fmode & O_EXCL) { 181 error = EEXIST; 182 goto bad; 183 } 184 fmode &= ~O_CREAT; 185 } 186 } else { 187 ndp->ni_cnd.cn_nameiop = LOOKUP; 188 ndp->ni_cnd.cn_flags = LOCKLEAF; 189 if ((fmode & O_NOFOLLOW) == 0) 190 ndp->ni_cnd.cn_flags |= FOLLOW; 191 if ((error = namei(ndp)) != 0) 192 return (error); 193 vp = ndp->ni_vp; 194 } 195 if (vp->v_type == VSOCK) { 196 error = EOPNOTSUPP; 197 goto bad; 198 } 199 if (ndp->ni_vp->v_type == VLNK) { 200 error = EFTYPE; 201 goto bad; 202 } 203 204 #ifdef VERIFIED_EXEC 205 if ((error = VOP_GETATTR(vp, &va, cred, p)) != 0) 206 goto bad; 207 #endif 208 209 if ((fmode & O_CREAT) == 0) { 210 #ifdef VERIFIED_EXEC 211 if ((error = veriexec_verify(p, vp, &va, pathbuf, 212 VERIEXEC_FILE, &vhe)) != 0) 213 goto bad; 214 #endif 215 216 if (fmode & FREAD) { 217 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 218 goto bad; 219 } 220 221 if (fmode & (FWRITE | O_TRUNC)) { 222 if (vp->v_type == VDIR) { 223 error = EISDIR; 224 goto bad; 225 } 226 if ((error = vn_writechk(vp)) != 0 || 227 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 228 goto bad; 229 #ifdef VERIFIED_EXEC 230 if (vhe != NULL) { 231 veriexec_report("Write access request.", 232 pathbuf, &va, p, 233 REPORT_NOVERBOSE, 234 REPORT_ALARM, 235 REPORT_NOPANIC); 236 237 /* IPS mode: Deny writing to monitored files. */ 238 if (veriexec_strict >= 2) { 239 error = EPERM; 240 goto bad; 241 } else { 242 vhe->status = FINGERPRINT_NOTEVAL; 243 } 244 } 245 #endif 246 } 247 } 248 249 if (fmode & O_TRUNC) { 250 VOP_UNLOCK(vp, 0); /* XXX */ 251 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 252 vrele(vp); 253 return (error); 254 } 255 VOP_LEASE(vp, p, cred, LEASE_WRITE); 256 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 257 VATTR_NULL(&va); 258 va.va_size = 0; 259 error = VOP_SETATTR(vp, &va, cred, p); 260 vn_finished_write(mp, 0); 261 if (error != 0) 262 goto bad; 263 } 264 if ((error = VOP_OPEN(vp, fmode, cred, p)) != 0) 265 goto bad; 266 if (vp->v_type == VREG && 267 uvn_attach(vp, fmode & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 268 error = EIO; 269 goto bad; 270 } 271 if (fmode & FWRITE) 272 vp->v_writecount++; 273 274 return (0); 275 bad: 276 vput(vp); 277 return (error); 278 } 279 280 /* 281 * Check for write permissions on the specified vnode. 282 * Prototype text segments cannot be written. 283 */ 284 int 285 vn_writechk(vp) 286 struct vnode *vp; 287 { 288 289 /* 290 * If the vnode is in use as a process's text, 291 * we can't allow writing. 292 */ 293 if (vp->v_flag & VTEXT) 294 return (ETXTBSY); 295 return (0); 296 } 297 298 /* 299 * Mark a vnode as having executable mappings. 300 */ 301 void 302 vn_markexec(vp) 303 struct vnode *vp; 304 { 305 if ((vp->v_flag & VEXECMAP) == 0) { 306 uvmexp.filepages -= vp->v_uobj.uo_npages; 307 uvmexp.execpages += vp->v_uobj.uo_npages; 308 } 309 vp->v_flag |= VEXECMAP; 310 } 311 312 /* 313 * Mark a vnode as being the text of a process. 314 * Fail if the vnode is currently writable. 315 */ 316 int 317 vn_marktext(vp) 318 struct vnode *vp; 319 { 320 321 if (vp->v_writecount != 0) { 322 KASSERT((vp->v_flag & VTEXT) == 0); 323 return (ETXTBSY); 324 } 325 vp->v_flag |= VTEXT; 326 vn_markexec(vp); 327 return (0); 328 } 329 330 /* 331 * Vnode close call 332 * 333 * Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node. 334 */ 335 int 336 vn_close(vp, flags, cred, p) 337 struct vnode *vp; 338 int flags; 339 struct ucred *cred; 340 struct proc *p; 341 { 342 int error; 343 344 if (flags & FWRITE) 345 vp->v_writecount--; 346 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 347 error = VOP_CLOSE(vp, flags, cred, p); 348 vput(vp); 349 return (error); 350 } 351 352 /* 353 * Package up an I/O request on a vnode into a uio and do it. 354 */ 355 int 356 vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p) 357 enum uio_rw rw; 358 struct vnode *vp; 359 caddr_t base; 360 int len; 361 off_t offset; 362 enum uio_seg segflg; 363 int ioflg; 364 struct ucred *cred; 365 size_t *aresid; 366 struct proc *p; 367 { 368 struct uio auio; 369 struct iovec aiov; 370 struct mount *mp; 371 int error; 372 373 if ((ioflg & IO_NODELOCKED) == 0) { 374 if (rw == UIO_READ) { 375 vn_lock(vp, LK_SHARED | LK_RETRY); 376 } else /* UIO_WRITE */ { 377 if (vp->v_type != VCHR && 378 (error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) 379 != 0) 380 return (error); 381 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 382 } 383 } 384 auio.uio_iov = &aiov; 385 auio.uio_iovcnt = 1; 386 aiov.iov_base = base; 387 aiov.iov_len = len; 388 auio.uio_resid = len; 389 auio.uio_offset = offset; 390 auio.uio_segflg = segflg; 391 auio.uio_rw = rw; 392 auio.uio_procp = p; 393 if (rw == UIO_READ) { 394 error = VOP_READ(vp, &auio, ioflg, cred); 395 } else { 396 error = VOP_WRITE(vp, &auio, ioflg, cred); 397 } 398 if (aresid) 399 *aresid = auio.uio_resid; 400 else 401 if (auio.uio_resid && error == 0) 402 error = EIO; 403 if ((ioflg & IO_NODELOCKED) == 0) { 404 if (rw == UIO_WRITE) 405 vn_finished_write(mp, 0); 406 VOP_UNLOCK(vp, 0); 407 } 408 return (error); 409 } 410 411 int 412 vn_readdir(fp, buf, segflg, count, done, p, cookies, ncookies) 413 struct file *fp; 414 char *buf; 415 int segflg, *done, *ncookies; 416 u_int count; 417 struct proc *p; 418 off_t **cookies; 419 { 420 struct vnode *vp = (struct vnode *)fp->f_data; 421 struct iovec aiov; 422 struct uio auio; 423 int error, eofflag; 424 425 unionread: 426 if (vp->v_type != VDIR) 427 return (EINVAL); 428 aiov.iov_base = buf; 429 aiov.iov_len = count; 430 auio.uio_iov = &aiov; 431 auio.uio_iovcnt = 1; 432 auio.uio_rw = UIO_READ; 433 auio.uio_segflg = segflg; 434 auio.uio_procp = p; 435 auio.uio_resid = count; 436 vn_lock(vp, LK_SHARED | LK_RETRY); 437 auio.uio_offset = fp->f_offset; 438 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookies, 439 ncookies); 440 fp->f_offset = auio.uio_offset; 441 VOP_UNLOCK(vp, 0); 442 if (error) 443 return (error); 444 445 #if defined(UNION) || defined(LKM) 446 if (count == auio.uio_resid && vn_union_readdir_hook) { 447 struct vnode *ovp = vp; 448 449 error = (*vn_union_readdir_hook)(&vp, fp, p); 450 if (error) 451 return (error); 452 if (vp != ovp) 453 goto unionread; 454 } 455 #endif /* UNION || LKM */ 456 457 if (count == auio.uio_resid && (vp->v_flag & VROOT) && 458 (vp->v_mount->mnt_flag & MNT_UNION)) { 459 struct vnode *tvp = vp; 460 vp = vp->v_mount->mnt_vnodecovered; 461 VREF(vp); 462 fp->f_data = vp; 463 fp->f_offset = 0; 464 vrele(tvp); 465 goto unionread; 466 } 467 *done = count - auio.uio_resid; 468 return error; 469 } 470 471 /* 472 * File table vnode read routine. 473 */ 474 static int 475 vn_read(fp, offset, uio, cred, flags) 476 struct file *fp; 477 off_t *offset; 478 struct uio *uio; 479 struct ucred *cred; 480 int flags; 481 { 482 struct vnode *vp = (struct vnode *)fp->f_data; 483 int count, error, ioflag = 0; 484 485 VOP_LEASE(vp, uio->uio_procp, cred, LEASE_READ); 486 if (fp->f_flag & FNONBLOCK) 487 ioflag |= IO_NDELAY; 488 if ((fp->f_flag & (FFSYNC | FRSYNC)) == (FFSYNC | FRSYNC)) 489 ioflag |= IO_SYNC; 490 if (fp->f_flag & FALTIO) 491 ioflag |= IO_ALTSEMANTICS; 492 vn_lock(vp, LK_SHARED | LK_RETRY); 493 uio->uio_offset = *offset; 494 count = uio->uio_resid; 495 error = VOP_READ(vp, uio, ioflag, cred); 496 if (flags & FOF_UPDATE_OFFSET) 497 *offset += count - uio->uio_resid; 498 VOP_UNLOCK(vp, 0); 499 return (error); 500 } 501 502 /* 503 * File table vnode write routine. 504 */ 505 static int 506 vn_write(fp, offset, uio, cred, flags) 507 struct file *fp; 508 off_t *offset; 509 struct uio *uio; 510 struct ucred *cred; 511 int flags; 512 { 513 struct vnode *vp = (struct vnode *)fp->f_data; 514 struct mount *mp; 515 int count, error, ioflag = IO_UNIT; 516 517 if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) 518 ioflag |= IO_APPEND; 519 if (fp->f_flag & FNONBLOCK) 520 ioflag |= IO_NDELAY; 521 if (fp->f_flag & FFSYNC || 522 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 523 ioflag |= IO_SYNC; 524 else if (fp->f_flag & FDSYNC) 525 ioflag |= IO_DSYNC; 526 if (fp->f_flag & FALTIO) 527 ioflag |= IO_ALTSEMANTICS; 528 mp = NULL; 529 if (vp->v_type != VCHR && 530 (error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 531 return (error); 532 VOP_LEASE(vp, uio->uio_procp, cred, LEASE_WRITE); 533 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 534 uio->uio_offset = *offset; 535 count = uio->uio_resid; 536 error = VOP_WRITE(vp, uio, ioflag, cred); 537 if (flags & FOF_UPDATE_OFFSET) { 538 if (ioflag & IO_APPEND) 539 *offset = uio->uio_offset; 540 else 541 *offset += count - uio->uio_resid; 542 } 543 VOP_UNLOCK(vp, 0); 544 vn_finished_write(mp, 0); 545 return (error); 546 } 547 548 /* 549 * File table vnode stat routine. 550 */ 551 static int 552 vn_statfile(fp, sb, p) 553 struct file *fp; 554 struct stat *sb; 555 struct proc *p; 556 { 557 struct vnode *vp = (struct vnode *)fp->f_data; 558 559 return vn_stat(vp, sb, p); 560 } 561 562 int 563 vn_stat(vp, sb, p) 564 struct vnode *vp; 565 struct stat *sb; 566 struct proc *p; 567 { 568 struct vattr va; 569 int error; 570 mode_t mode; 571 572 error = VOP_GETATTR(vp, &va, p->p_ucred, p); 573 if (error) 574 return (error); 575 /* 576 * Copy from vattr table 577 */ 578 sb->st_dev = va.va_fsid; 579 sb->st_ino = va.va_fileid; 580 mode = va.va_mode; 581 switch (vp->v_type) { 582 case VREG: 583 mode |= S_IFREG; 584 break; 585 case VDIR: 586 mode |= S_IFDIR; 587 break; 588 case VBLK: 589 mode |= S_IFBLK; 590 break; 591 case VCHR: 592 mode |= S_IFCHR; 593 break; 594 case VLNK: 595 mode |= S_IFLNK; 596 break; 597 case VSOCK: 598 mode |= S_IFSOCK; 599 break; 600 case VFIFO: 601 mode |= S_IFIFO; 602 break; 603 default: 604 return (EBADF); 605 }; 606 sb->st_mode = mode; 607 sb->st_nlink = va.va_nlink; 608 sb->st_uid = va.va_uid; 609 sb->st_gid = va.va_gid; 610 sb->st_rdev = va.va_rdev; 611 sb->st_size = va.va_size; 612 sb->st_atimespec = va.va_atime; 613 sb->st_mtimespec = va.va_mtime; 614 sb->st_ctimespec = va.va_ctime; 615 sb->st_birthtimespec = va.va_birthtime; 616 sb->st_blksize = va.va_blocksize; 617 sb->st_flags = va.va_flags; 618 sb->st_gen = 0; 619 sb->st_blocks = va.va_bytes / S_BLKSIZE; 620 return (0); 621 } 622 623 /* 624 * File table vnode fcntl routine. 625 */ 626 static int 627 vn_fcntl(fp, com, data, p) 628 struct file *fp; 629 u_int com; 630 void *data; 631 struct proc *p; 632 { 633 struct vnode *vp = ((struct vnode *)fp->f_data); 634 int error; 635 636 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 637 error = VOP_FCNTL(vp, com, data, fp->f_flag, p->p_ucred, p); 638 VOP_UNLOCK(vp, 0); 639 return (error); 640 } 641 642 /* 643 * File table vnode ioctl routine. 644 */ 645 static int 646 vn_ioctl(fp, com, data, p) 647 struct file *fp; 648 u_long com; 649 void *data; 650 struct proc *p; 651 { 652 struct vnode *vp = ((struct vnode *)fp->f_data); 653 struct vattr vattr; 654 int error; 655 656 switch (vp->v_type) { 657 658 case VREG: 659 case VDIR: 660 if (com == FIONREAD) { 661 error = VOP_GETATTR(vp, &vattr, p->p_ucred, p); 662 if (error) 663 return (error); 664 *(int *)data = vattr.va_size - fp->f_offset; 665 return (0); 666 } 667 if ((com == FIONWRITE) || (com == FIONSPACE)) { 668 /* 669 * Files don't have send queues, so there never 670 * are any bytes in them, nor is there any 671 * open space in them. 672 */ 673 *(int *)data = 0; 674 return (0); 675 } 676 if (com == FIOGETBMAP) { 677 daddr_t *block; 678 679 if (*(daddr_t *)data < 0) 680 return (EINVAL); 681 block = (daddr_t *)data; 682 return (VOP_BMAP(vp, *block, NULL, block, NULL)); 683 } 684 if (com == OFIOGETBMAP) { 685 daddr_t ibn, obn; 686 687 if (*(int32_t *)data < 0) 688 return (EINVAL); 689 ibn = (daddr_t)*(int32_t *)data; 690 error = VOP_BMAP(vp, ibn, NULL, &obn, NULL); 691 *(int32_t *)data = (int32_t)obn; 692 return error; 693 } 694 if (com == FIONBIO || com == FIOASYNC) /* XXX */ 695 return (0); /* XXX */ 696 /* fall into ... */ 697 case VFIFO: 698 case VCHR: 699 case VBLK: 700 error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p); 701 if (error == 0 && com == TIOCSCTTY) { 702 if (p->p_session->s_ttyvp) 703 vrele(p->p_session->s_ttyvp); 704 p->p_session->s_ttyvp = vp; 705 VREF(vp); 706 } 707 return (error); 708 709 default: 710 return (EPASSTHROUGH); 711 } 712 } 713 714 /* 715 * File table vnode poll routine. 716 */ 717 static int 718 vn_poll(fp, events, p) 719 struct file *fp; 720 int events; 721 struct proc *p; 722 { 723 724 return (VOP_POLL(((struct vnode *)fp->f_data), events, p)); 725 } 726 727 /* 728 * File table vnode kqfilter routine. 729 */ 730 int 731 vn_kqfilter(fp, kn) 732 struct file *fp; 733 struct knote *kn; 734 { 735 736 return (VOP_KQFILTER((struct vnode *)fp->f_data, kn)); 737 } 738 739 /* 740 * Check that the vnode is still valid, and if so 741 * acquire requested lock. 742 */ 743 int 744 vn_lock(vp, flags) 745 struct vnode *vp; 746 int flags; 747 { 748 int error; 749 750 #if 0 751 KASSERT(vp->v_usecount > 0 || (flags & LK_INTERLOCK) != 0 752 || (vp->v_flag & VONWORKLST) != 0); 753 #endif 754 755 do { 756 if ((flags & LK_INTERLOCK) == 0) 757 simple_lock(&vp->v_interlock); 758 if (vp->v_flag & VXLOCK) { 759 if (flags & LK_NOWAIT) { 760 simple_unlock(&vp->v_interlock); 761 return EBUSY; 762 } 763 vp->v_flag |= VXWANT; 764 ltsleep(vp, PINOD | PNORELOCK, 765 "vn_lock", 0, &vp->v_interlock); 766 error = ENOENT; 767 } else { 768 error = VOP_LOCK(vp, 769 (flags & ~LK_RETRY) | LK_INTERLOCK); 770 if (error == 0 || error == EDEADLK || error == EBUSY) 771 return (error); 772 } 773 flags &= ~LK_INTERLOCK; 774 } while (flags & LK_RETRY); 775 return (error); 776 } 777 778 /* 779 * File table vnode close routine. 780 */ 781 static int 782 vn_closefile(fp, p) 783 struct file *fp; 784 struct proc *p; 785 { 786 787 return (vn_close(((struct vnode *)fp->f_data), fp->f_flag, 788 fp->f_cred, p)); 789 } 790 791 /* 792 * Enable LK_CANRECURSE on lock. Return prior status. 793 */ 794 u_int 795 vn_setrecurse(vp) 796 struct vnode *vp; 797 { 798 struct lock *lkp = &vp->v_lock; 799 u_int retval = lkp->lk_flags & LK_CANRECURSE; 800 801 lkp->lk_flags |= LK_CANRECURSE; 802 return retval; 803 } 804 805 /* 806 * Called when done with locksetrecurse. 807 */ 808 void 809 vn_restorerecurse(vp, flags) 810 struct vnode *vp; 811 u_int flags; 812 { 813 struct lock *lkp = &vp->v_lock; 814 815 lkp->lk_flags &= ~LK_CANRECURSE; 816 lkp->lk_flags |= flags; 817 } 818 819 int 820 vn_cow_establish(struct vnode *vp, 821 int (*func)(void *, struct buf *), void *cookie) 822 { 823 int s; 824 struct spec_cow_entry *e; 825 826 MALLOC(e, struct spec_cow_entry *, sizeof(struct spec_cow_entry), 827 M_DEVBUF, M_WAITOK); 828 e->ce_func = func; 829 e->ce_cookie = cookie; 830 831 SPEC_COW_LOCK(vp->v_specinfo, s); 832 vp->v_spec_cow_req++; 833 while (vp->v_spec_cow_count > 0) 834 ltsleep(&vp->v_spec_cow_req, PRIBIO, "cowlist", 0, 835 &vp->v_spec_cow_slock); 836 837 SLIST_INSERT_HEAD(&vp->v_spec_cow_head, e, ce_list); 838 839 vp->v_spec_cow_req--; 840 if (vp->v_spec_cow_req == 0) 841 wakeup(&vp->v_spec_cow_req); 842 SPEC_COW_UNLOCK(vp->v_specinfo, s); 843 844 return 0; 845 } 846 847 int 848 vn_cow_disestablish(struct vnode *vp, 849 int (*func)(void *, struct buf *), void *cookie) 850 { 851 int s; 852 struct spec_cow_entry *e; 853 854 SPEC_COW_LOCK(vp->v_specinfo, s); 855 vp->v_spec_cow_req++; 856 while (vp->v_spec_cow_count > 0) 857 ltsleep(&vp->v_spec_cow_req, PRIBIO, "cowlist", 0, 858 &vp->v_spec_cow_slock); 859 860 SLIST_FOREACH(e, &vp->v_spec_cow_head, ce_list) 861 if (e->ce_func == func && e->ce_cookie == cookie) { 862 SLIST_REMOVE(&vp->v_spec_cow_head, e, 863 spec_cow_entry, ce_list); 864 FREE(e, M_DEVBUF); 865 break; 866 } 867 868 vp->v_spec_cow_req--; 869 if (vp->v_spec_cow_req == 0) 870 wakeup(&vp->v_spec_cow_req); 871 SPEC_COW_UNLOCK(vp->v_specinfo, s); 872 873 return e ? 0 : EINVAL; 874 } 875 876 /* 877 * Simplified in-kernel wrapper calls for extended attribute access. 878 * Both calls pass in a NULL credential, authorizing a "kernel" access. 879 * Set IO_NODELOCKED in ioflg if the vnode is already locked. 880 */ 881 int 882 vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, 883 const char *attrname, size_t *buflen, void *buf, struct proc *p) 884 { 885 struct uio auio; 886 struct iovec aiov; 887 int error; 888 889 aiov.iov_len = *buflen; 890 aiov.iov_base = buf; 891 892 auio.uio_iov = &aiov; 893 auio.uio_iovcnt = 1; 894 auio.uio_rw = UIO_READ; 895 auio.uio_segflg = UIO_SYSSPACE; 896 auio.uio_procp = p; 897 auio.uio_offset = 0; 898 auio.uio_resid = *buflen; 899 900 if ((ioflg & IO_NODELOCKED) == 0) 901 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 902 903 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL, 904 p); 905 906 if ((ioflg & IO_NODELOCKED) == 0) 907 VOP_UNLOCK(vp, 0); 908 909 if (error == 0) 910 *buflen = *buflen - auio.uio_resid; 911 912 return (error); 913 } 914 915 /* 916 * XXX Failure mode if partially written? 917 */ 918 int 919 vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, 920 const char *attrname, size_t buflen, const void *buf, struct proc *p) 921 { 922 struct uio auio; 923 struct iovec aiov; 924 struct mount *mp; 925 int error; 926 927 aiov.iov_len = buflen; 928 aiov.iov_base = (caddr_t) buf; /* XXX kills const */ 929 930 auio.uio_iov = &aiov; 931 auio.uio_iovcnt = 1; 932 auio.uio_rw = UIO_WRITE; 933 auio.uio_segflg = UIO_SYSSPACE; 934 auio.uio_procp = p; 935 auio.uio_offset = 0; 936 auio.uio_resid = buflen; 937 938 if ((ioflg & IO_NODELOCKED) == 0) { 939 if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0) 940 return (error); 941 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 942 } 943 944 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, p); 945 946 if ((ioflg & IO_NODELOCKED) == 0) { 947 vn_finished_write(mp, 0); 948 VOP_UNLOCK(vp, 0); 949 } 950 951 return (error); 952 } 953 954 int 955 vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, 956 const char *attrname, struct proc *p) 957 { 958 struct mount *mp; 959 int error; 960 961 if ((ioflg & IO_NODELOCKED) == 0) { 962 if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0) 963 return (error); 964 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 965 } 966 967 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL, p); 968 if (error == EOPNOTSUPP) 969 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, 970 NULL, p); 971 972 if ((ioflg & IO_NODELOCKED) == 0) { 973 vn_finished_write(mp, 0); 974 VOP_UNLOCK(vp, 0); 975 } 976 977 return (error); 978 } 979
Indexes created Sat Sep 20 22:09:52 GMT 2025