vfs_vnops.c revision 1.74
1 /* $NetBSD: vfs_vnops.c,v 1.74 2003/09/29 10:04:03 cb 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 1.74 2003/09/29 10:04:03 cb Exp $"); 41 42 #include "fs_union.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/file.h> 48 #include <sys/stat.h> 49 #include <sys/buf.h> 50 #include <sys/proc.h> 51 #include <sys/mount.h> 52 #include <sys/namei.h> 53 #include <sys/vnode.h> 54 #include <sys/ioctl.h> 55 #include <sys/tty.h> 56 #include <sys/poll.h> 57 58 #include <uvm/uvm_extern.h> 59 60 #ifdef UNION 61 #include <fs/union/union.h> 62 #endif 63 64 #if defined(LKM) || defined(UNION) 65 int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct proc *); 66 #endif 67 68 #ifdef VERIFIED_EXEC 69 #include <sys/verified_exec.h> 70 71 extern LIST_HEAD(veriexec_devhead, veriexec_dev_list) veriexec_dev_head; 72 extern struct veriexec_devhead veriexec_file_dev_head; 73 #endif 74 75 static int vn_read(struct file *fp, off_t *offset, struct uio *uio, 76 struct ucred *cred, int flags); 77 static int vn_write(struct file *fp, off_t *offset, struct uio *uio, 78 struct ucred *cred, int flags); 79 static int vn_closefile(struct file *fp, struct proc *p); 80 static int vn_poll(struct file *fp, int events, struct proc *p); 81 static int vn_fcntl(struct file *fp, u_int com, void *data, struct proc *p); 82 static int vn_statfile(struct file *fp, struct stat *sb, struct proc *p); 83 static int vn_ioctl(struct file *fp, u_long com, void *data, struct proc *p); 84 85 struct fileops vnops = { 86 vn_read, vn_write, vn_ioctl, vn_fcntl, vn_poll, 87 vn_statfile, vn_closefile, vn_kqfilter 88 }; 89 90 /* 91 * Common code for vnode open operations. 92 * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. 93 */ 94 int 95 vn_open(ndp, fmode, cmode) 96 struct nameidata *ndp; 97 int fmode, cmode; 98 { 99 struct vnode *vp; 100 struct proc *p = ndp->ni_cnd.cn_proc; 101 struct ucred *cred = p->p_ucred; 102 struct vattr va; 103 int error; 104 #ifdef VERIFIED_EXEC 105 char got_dev; 106 struct veriexec_inode_list *veriexec_node; 107 char fingerprint[MAXFINGERPRINTLEN]; 108 #endif 109 110 if (fmode & O_CREAT) { 111 ndp->ni_cnd.cn_nameiop = CREATE; 112 ndp->ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF; 113 if ((fmode & O_EXCL) == 0 && 114 ((fmode & O_NOFOLLOW) == 0)) 115 ndp->ni_cnd.cn_flags |= FOLLOW; 116 if ((error = namei(ndp)) != 0) 117 return (error); 118 if (ndp->ni_vp == NULL) { 119 VATTR_NULL(&va); 120 va.va_type = VREG; 121 va.va_mode = cmode; 122 if (fmode & O_EXCL) 123 va.va_vaflags |= VA_EXCLUSIVE; 124 VOP_LEASE(ndp->ni_dvp, p, cred, LEASE_WRITE); 125 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, 126 &ndp->ni_cnd, &va); 127 if (error) 128 return (error); 129 fmode &= ~O_TRUNC; 130 vp = ndp->ni_vp; 131 } else { 132 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 133 if (ndp->ni_dvp == ndp->ni_vp) 134 vrele(ndp->ni_dvp); 135 else 136 vput(ndp->ni_dvp); 137 ndp->ni_dvp = NULL; 138 vp = ndp->ni_vp; 139 if (fmode & O_EXCL) { 140 error = EEXIST; 141 goto bad; 142 } 143 fmode &= ~O_CREAT; 144 } 145 } else { 146 ndp->ni_cnd.cn_nameiop = LOOKUP; 147 ndp->ni_cnd.cn_flags = LOCKLEAF; 148 if ((fmode & O_NOFOLLOW) == 0) 149 ndp->ni_cnd.cn_flags |= FOLLOW; 150 if ((error = namei(ndp)) != 0) 151 return (error); 152 vp = ndp->ni_vp; 153 } 154 if (vp->v_type == VSOCK) { 155 error = EOPNOTSUPP; 156 goto bad; 157 } 158 if (ndp->ni_vp->v_type == VLNK) { 159 error = EFTYPE; 160 goto bad; 161 } 162 163 #ifdef VERIFIED_EXEC 164 veriexec_node = NULL; 165 166 if ((error = VOP_GETATTR(vp, &va, cred, p)) != 0) 167 goto bad; 168 #endif 169 170 if ((fmode & O_CREAT) == 0) { 171 #ifdef VERIFIED_EXEC 172 /* 173 * Look for the file on the fingerprint lists iff 174 * it has not been seen before. 175 */ 176 if ((vp->fp_status == FINGERPRINT_INVALID) || 177 (vp->fp_status == FINGERPRINT_NODEV)) { 178 /* check the file list for the finger print */ 179 veriexec_node = get_veriexec_inode(&veriexec_file_dev_head, 180 va.va_fsid, 181 va.va_fileid, 182 &got_dev); 183 if (veriexec_node == NULL) { 184 /* failing that, check the exec list */ 185 veriexec_node = get_veriexec_inode( 186 &veriexec_dev_head, va.va_fsid, 187 va.va_fileid, &got_dev); 188 } 189 190 if ((veriexec_node == NULL) && (got_dev == 1)) 191 vp->fp_status = FINGERPRINT_NOENTRY; 192 193 if (veriexec_node != NULL) { 194 if ((error = evaluate_fingerprint(vp, 195 veriexec_node, p, va.va_size, 196 fingerprint)) != 0) 197 goto bad; 198 199 if (fingerprintcmp(veriexec_node, 200 fingerprint) == 0) { 201 /* fingerprint ok */ 202 vp->fp_status = FINGERPRINT_VALID; 203 #ifdef VERIFIED_EXEC_DEBUG 204 printf( 205 "file fingerprint matches for dev %lu, file %lu\n", 206 va.va_fsid, va.va_fileid); 207 #endif 208 } else { 209 vp->fp_status = FINGERPRINT_NOMATCH; 210 } 211 } 212 } 213 #endif 214 215 if (fmode & FREAD) { 216 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 217 goto bad; 218 219 #ifdef VERIFIED_EXEC 220 /* file is on finger print list */ 221 if (vp->fp_status == FINGERPRINT_NOMATCH) { 222 /* fingerprint bad */ 223 printf( 224 "file fingerprint does not match on dev %lu, file %lu\n", 225 va.va_fsid, va.va_fileid); 226 if (securelevel > 2) { 227 error = EPERM; 228 goto bad; 229 } 230 } 231 #endif 232 } 233 if (fmode & (FWRITE | O_TRUNC)) { 234 if (vp->v_type == VDIR) { 235 error = EISDIR; 236 goto bad; 237 } 238 if ((error = vn_writechk(vp)) != 0 || 239 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 240 goto bad; 241 #ifdef VERIFIED_EXEC 242 /* 243 * If file has a fingerprint then 244 * deny the write request, otherwise 245 * invalidate the status so we don't 246 * keep checking for the file having 247 * a fingerprint. 248 */ 249 if (vp->fp_status == FINGERPRINT_VALID) { 250 printf( 251 "writing to fingerprinted file for dev %lu, file %lu\n", 252 va.va_fsid, va.va_fileid); 253 if (securelevel > 2) { 254 error = EPERM; 255 goto bad; 256 } else { 257 vp->fp_status = FINGERPRINT_INVALID; 258 } 259 } 260 #endif 261 } 262 } 263 if (fmode & O_TRUNC) { 264 VOP_UNLOCK(vp, 0); /* XXX */ 265 VOP_LEASE(vp, p, cred, LEASE_WRITE); 266 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 267 VATTR_NULL(&va); 268 va.va_size = 0; 269 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 270 goto bad; 271 } 272 if ((error = VOP_OPEN(vp, fmode, cred, p)) != 0) 273 goto bad; 274 if (vp->v_type == VREG && 275 uvn_attach(vp, fmode & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 276 error = EIO; 277 goto bad; 278 } 279 if (fmode & FWRITE) 280 vp->v_writecount++; 281 282 return (0); 283 bad: 284 vput(vp); 285 return (error); 286 } 287 288 /* 289 * Check for write permissions on the specified vnode. 290 * Prototype text segments cannot be written. 291 */ 292 int 293 vn_writechk(vp) 294 struct vnode *vp; 295 { 296 297 /* 298 * If the vnode is in use as a process's text, 299 * we can't allow writing. 300 */ 301 if (vp->v_flag & VTEXT) 302 return (ETXTBSY); 303 return (0); 304 } 305 306 /* 307 * Mark a vnode as having executable mappings. 308 */ 309 void 310 vn_markexec(vp) 311 struct vnode *vp; 312 { 313 if ((vp->v_flag & VEXECMAP) == 0) { 314 uvmexp.filepages -= vp->v_uobj.uo_npages; 315 uvmexp.execpages += vp->v_uobj.uo_npages; 316 } 317 vp->v_flag |= VEXECMAP; 318 } 319 320 /* 321 * Mark a vnode as being the text of a process. 322 * Fail if the vnode is currently writable. 323 */ 324 int 325 vn_marktext(vp) 326 struct vnode *vp; 327 { 328 329 if (vp->v_writecount != 0) { 330 KASSERT((vp->v_flag & VTEXT) == 0); 331 return (ETXTBSY); 332 } 333 vp->v_flag |= VTEXT; 334 vn_markexec(vp); 335 return (0); 336 } 337 338 /* 339 * Vnode close call 340 * 341 * Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node. 342 */ 343 int 344 vn_close(vp, flags, cred, p) 345 struct vnode *vp; 346 int flags; 347 struct ucred *cred; 348 struct proc *p; 349 { 350 int error; 351 352 if (flags & FWRITE) 353 vp->v_writecount--; 354 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 355 error = VOP_CLOSE(vp, flags, cred, p); 356 vput(vp); 357 return (error); 358 } 359 360 /* 361 * Package up an I/O request on a vnode into a uio and do it. 362 */ 363 int 364 vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p) 365 enum uio_rw rw; 366 struct vnode *vp; 367 caddr_t base; 368 int len; 369 off_t offset; 370 enum uio_seg segflg; 371 int ioflg; 372 struct ucred *cred; 373 size_t *aresid; 374 struct proc *p; 375 { 376 struct uio auio; 377 struct iovec aiov; 378 int error; 379 380 if ((ioflg & IO_NODELOCKED) == 0) { 381 if (rw == UIO_READ) { 382 vn_lock(vp, LK_SHARED | LK_RETRY); 383 } else { 384 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 385 } 386 } 387 auio.uio_iov = &aiov; 388 auio.uio_iovcnt = 1; 389 aiov.iov_base = base; 390 aiov.iov_len = len; 391 auio.uio_resid = len; 392 auio.uio_offset = offset; 393 auio.uio_segflg = segflg; 394 auio.uio_rw = rw; 395 auio.uio_procp = p; 396 if (rw == UIO_READ) { 397 error = VOP_READ(vp, &auio, ioflg, cred); 398 } else { 399 error = VOP_WRITE(vp, &auio, ioflg, cred); 400 } 401 if (aresid) 402 *aresid = auio.uio_resid; 403 else 404 if (auio.uio_resid && error == 0) 405 error = EIO; 406 if ((ioflg & IO_NODELOCKED) == 0) 407 VOP_UNLOCK(vp, 0); 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 int count, error, ioflag = IO_UNIT; 515 516 if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) 517 ioflag |= IO_APPEND; 518 if (fp->f_flag & FNONBLOCK) 519 ioflag |= IO_NDELAY; 520 if (fp->f_flag & FFSYNC || 521 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 522 ioflag |= IO_SYNC; 523 else if (fp->f_flag & FDSYNC) 524 ioflag |= IO_DSYNC; 525 if (fp->f_flag & FALTIO) 526 ioflag |= IO_ALTSEMANTICS; 527 VOP_LEASE(vp, uio->uio_procp, cred, LEASE_WRITE); 528 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 529 uio->uio_offset = *offset; 530 count = uio->uio_resid; 531 error = VOP_WRITE(vp, uio, ioflag, cred); 532 if (flags & FOF_UPDATE_OFFSET) { 533 if (ioflag & IO_APPEND) 534 *offset = uio->uio_offset; 535 else 536 *offset += count - uio->uio_resid; 537 } 538 VOP_UNLOCK(vp, 0); 539 return (error); 540 } 541 542 /* 543 * File table vnode stat routine. 544 */ 545 static int 546 vn_statfile(fp, sb, p) 547 struct file *fp; 548 struct stat *sb; 549 struct proc *p; 550 { 551 struct vnode *vp = (struct vnode *)fp->f_data; 552 553 return vn_stat(vp, sb, p); 554 } 555 556 int 557 vn_stat(vp, sb, p) 558 struct vnode *vp; 559 struct stat *sb; 560 struct proc *p; 561 { 562 struct vattr va; 563 int error; 564 mode_t mode; 565 566 error = VOP_GETATTR(vp, &va, p->p_ucred, p); 567 if (error) 568 return (error); 569 /* 570 * Copy from vattr table 571 */ 572 sb->st_dev = va.va_fsid; 573 sb->st_ino = va.va_fileid; 574 mode = va.va_mode; 575 switch (vp->v_type) { 576 case VREG: 577 mode |= S_IFREG; 578 break; 579 case VDIR: 580 mode |= S_IFDIR; 581 break; 582 case VBLK: 583 mode |= S_IFBLK; 584 break; 585 case VCHR: 586 mode |= S_IFCHR; 587 break; 588 case VLNK: 589 mode |= S_IFLNK; 590 break; 591 case VSOCK: 592 mode |= S_IFSOCK; 593 break; 594 case VFIFO: 595 mode |= S_IFIFO; 596 break; 597 default: 598 return (EBADF); 599 }; 600 sb->st_mode = mode; 601 sb->st_nlink = va.va_nlink; 602 sb->st_uid = va.va_uid; 603 sb->st_gid = va.va_gid; 604 sb->st_rdev = va.va_rdev; 605 sb->st_size = va.va_size; 606 sb->st_atimespec = va.va_atime; 607 sb->st_mtimespec = va.va_mtime; 608 sb->st_ctimespec = va.va_ctime; 609 sb->st_birthtimespec = va.va_birthtime; 610 sb->st_blksize = va.va_blocksize; 611 sb->st_flags = va.va_flags; 612 sb->st_gen = 0; 613 sb->st_blocks = va.va_bytes / S_BLKSIZE; 614 return (0); 615 } 616 617 /* 618 * File table vnode fcntl routine. 619 */ 620 static int 621 vn_fcntl(fp, com, data, p) 622 struct file *fp; 623 u_int com; 624 void *data; 625 struct proc *p; 626 { 627 struct vnode *vp = ((struct vnode *)fp->f_data); 628 int error; 629 630 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 631 error = VOP_FCNTL(vp, com, data, fp->f_flag, p->p_ucred, p); 632 VOP_UNLOCK(vp, 0); 633 return (error); 634 } 635 636 /* 637 * File table vnode ioctl routine. 638 */ 639 static int 640 vn_ioctl(fp, com, data, p) 641 struct file *fp; 642 u_long com; 643 void *data; 644 struct proc *p; 645 { 646 struct vnode *vp = ((struct vnode *)fp->f_data); 647 struct vattr vattr; 648 int error; 649 650 switch (vp->v_type) { 651 652 case VREG: 653 case VDIR: 654 if (com == FIONREAD) { 655 error = VOP_GETATTR(vp, &vattr, p->p_ucred, p); 656 if (error) 657 return (error); 658 *(int *)data = vattr.va_size - fp->f_offset; 659 return (0); 660 } 661 if (com == FIOGETBMAP) { 662 daddr_t *block; 663 664 if (*(daddr_t *)data < 0) 665 return (EINVAL); 666 block = (daddr_t *)data; 667 return (VOP_BMAP(vp, *block, NULL, block, NULL)); 668 } 669 if (com == OFIOGETBMAP) { 670 daddr_t ibn, obn; 671 672 if (*(int32_t *)data < 0) 673 return (EINVAL); 674 ibn = (daddr_t)*(int32_t *)data; 675 error = VOP_BMAP(vp, ibn, NULL, &obn, NULL); 676 *(int32_t *)data = (int32_t)obn; 677 return error; 678 } 679 if (com == FIONBIO || com == FIOASYNC) /* XXX */ 680 return (0); /* XXX */ 681 /* fall into ... */ 682 683 case VFIFO: 684 case VCHR: 685 case VBLK: 686 error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p); 687 if (error == 0 && com == TIOCSCTTY) { 688 if (p->p_session->s_ttyvp) 689 vrele(p->p_session->s_ttyvp); 690 p->p_session->s_ttyvp = vp; 691 VREF(vp); 692 } 693 return (error); 694 695 default: 696 return (EPASSTHROUGH); 697 } 698 } 699 700 /* 701 * File table vnode poll routine. 702 */ 703 static int 704 vn_poll(fp, events, p) 705 struct file *fp; 706 int events; 707 struct proc *p; 708 { 709 710 return (VOP_POLL(((struct vnode *)fp->f_data), events, p)); 711 } 712 713 /* 714 * File table vnode kqfilter routine. 715 */ 716 int 717 vn_kqfilter(fp, kn) 718 struct file *fp; 719 struct knote *kn; 720 { 721 722 return (VOP_KQFILTER((struct vnode *)fp->f_data, kn)); 723 } 724 725 /* 726 * Check that the vnode is still valid, and if so 727 * acquire requested lock. 728 */ 729 int 730 vn_lock(vp, flags) 731 struct vnode *vp; 732 int flags; 733 { 734 int error; 735 736 do { 737 if ((flags & LK_INTERLOCK) == 0) 738 simple_lock(&vp->v_interlock); 739 if (vp->v_flag & VXLOCK) { 740 if (flags & LK_NOWAIT) { 741 simple_unlock(&vp->v_interlock); 742 return EBUSY; 743 } 744 vp->v_flag |= VXWANT; 745 ltsleep(vp, PINOD | PNORELOCK, 746 "vn_lock", 0, &vp->v_interlock); 747 error = ENOENT; 748 } else { 749 error = VOP_LOCK(vp, flags | LK_INTERLOCK); 750 if (error == 0 || error == EDEADLK || error == EBUSY) 751 return (error); 752 } 753 flags &= ~LK_INTERLOCK; 754 } while (flags & LK_RETRY); 755 return (error); 756 } 757 758 /* 759 * File table vnode close routine. 760 */ 761 static int 762 vn_closefile(fp, p) 763 struct file *fp; 764 struct proc *p; 765 { 766 767 return (vn_close(((struct vnode *)fp->f_data), fp->f_flag, 768 fp->f_cred, p)); 769 } 770 771 /* 772 * Enable LK_CANRECURSE on lock. Return prior status. 773 */ 774 u_int 775 vn_setrecurse(vp) 776 struct vnode *vp; 777 { 778 struct lock *lkp = &vp->v_lock; 779 u_int retval = lkp->lk_flags & LK_CANRECURSE; 780 781 lkp->lk_flags |= LK_CANRECURSE; 782 return retval; 783 } 784 785 /* 786 * Called when done with locksetrecurse. 787 */ 788 void 789 vn_restorerecurse(vp, flags) 790 struct vnode *vp; 791 u_int flags; 792 { 793 struct lock *lkp = &vp->v_lock; 794 795 lkp->lk_flags &= ~LK_CANRECURSE; 796 lkp->lk_flags |= flags; 797 } 798
Indexes created Sun Sep 21 20:09:37 GMT 2025