vfs_vnops.c revision 1.142
1 /* $NetBSD: vfs_vnops.c,v 1.142 2007/10/08 15:12:09 ad 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 1.142 2007/10/08 15:12:09 ad Exp $"); 41 42 #include "fs_union.h" 43 #include "veriexec.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/file.h> 49 #include <sys/stat.h> 50 #include <sys/buf.h> 51 #include <sys/proc.h> 52 #include <sys/malloc.h> 53 #include <sys/mount.h> 54 #include <sys/namei.h> 55 #include <sys/vnode.h> 56 #include <sys/ioctl.h> 57 #include <sys/tty.h> 58 #include <sys/poll.h> 59 #include <sys/kauth.h> 60 #include <sys/syslog.h> 61 #include <sys/fstrans.h> 62 63 #include <miscfs/specfs/specdev.h> 64 65 #include <uvm/uvm_extern.h> 66 #include <uvm/uvm_readahead.h> 67 68 #ifdef UNION 69 #include <fs/union/union.h> 70 #endif 71 72 #if defined(LKM) || defined(UNION) 73 int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct lwp *); 74 #endif 75 76 #include <sys/verified_exec.h> 77 78 static int vn_read(struct file *fp, off_t *offset, struct uio *uio, 79 kauth_cred_t cred, int flags); 80 static int vn_write(struct file *fp, off_t *offset, struct uio *uio, 81 kauth_cred_t cred, int flags); 82 static int vn_closefile(struct file *fp, struct lwp *l); 83 static int vn_poll(struct file *fp, int events, struct lwp *l); 84 static int vn_fcntl(struct file *fp, u_int com, void *data, struct lwp *l); 85 static int vn_statfile(struct file *fp, struct stat *sb, struct lwp *l); 86 static int vn_ioctl(struct file *fp, u_long com, void *data, struct lwp *l); 87 88 const struct fileops vnops = { 89 vn_read, vn_write, vn_ioctl, vn_fcntl, vn_poll, 90 vn_statfile, vn_closefile, vn_kqfilter 91 }; 92 93 /* 94 * Common code for vnode open operations. 95 * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. 96 */ 97 int 98 vn_open(struct nameidata *ndp, int fmode, int cmode) 99 { 100 struct vnode *vp; 101 struct lwp *l = ndp->ni_cnd.cn_lwp; 102 kauth_cred_t cred = l->l_cred; 103 struct vattr va; 104 int error; 105 char *path; 106 107 ndp->ni_cnd.cn_flags &= TRYEMULROOT; 108 109 if (fmode & O_CREAT) { 110 ndp->ni_cnd.cn_nameiop = CREATE; 111 ndp->ni_cnd.cn_flags |= LOCKPARENT | LOCKLEAF; 112 if ((fmode & O_EXCL) == 0 && 113 ((fmode & O_NOFOLLOW) == 0)) 114 ndp->ni_cnd.cn_flags |= FOLLOW; 115 } else { 116 ndp->ni_cnd.cn_nameiop = LOOKUP; 117 ndp->ni_cnd.cn_flags |= LOCKLEAF; 118 if ((fmode & O_NOFOLLOW) == 0) 119 ndp->ni_cnd.cn_flags |= FOLLOW; 120 } 121 122 VERIEXEC_PATH_GET(ndp->ni_dirp, ndp->ni_segflg, ndp->ni_dirp, path); 123 124 error = namei(ndp); 125 if (error) 126 goto out; 127 128 vp = ndp->ni_vp; 129 130 #if NVERIEXEC > 0 131 error = veriexec_openchk(l, ndp->ni_vp, ndp->ni_dirp, fmode); 132 if (error) 133 goto bad; 134 #endif /* NVERIEXEC > 0 */ 135 136 if (fmode & O_CREAT) { 137 if (ndp->ni_vp == NULL) { 138 VATTR_NULL(&va); 139 va.va_type = VREG; 140 va.va_mode = cmode; 141 if (fmode & O_EXCL) 142 va.va_vaflags |= VA_EXCLUSIVE; 143 VOP_LEASE(ndp->ni_dvp, l, cred, LEASE_WRITE); 144 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, 145 &ndp->ni_cnd, &va); 146 if (error) 147 goto out; 148 fmode &= ~O_TRUNC; 149 vp = ndp->ni_vp; 150 } else { 151 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 152 if (ndp->ni_dvp == ndp->ni_vp) 153 vrele(ndp->ni_dvp); 154 else 155 vput(ndp->ni_dvp); 156 ndp->ni_dvp = NULL; 157 vp = ndp->ni_vp; 158 if (fmode & O_EXCL) { 159 error = EEXIST; 160 goto bad; 161 } 162 fmode &= ~O_CREAT; 163 } 164 } else { 165 vp = ndp->ni_vp; 166 } 167 if (vp->v_type == VSOCK) { 168 error = EOPNOTSUPP; 169 goto bad; 170 } 171 if (ndp->ni_vp->v_type == VLNK) { 172 error = EFTYPE; 173 goto bad; 174 } 175 176 if ((fmode & O_CREAT) == 0) { 177 if (fmode & FREAD) { 178 if ((error = VOP_ACCESS(vp, VREAD, cred, l)) != 0) 179 goto bad; 180 } 181 182 if (fmode & (FWRITE | O_TRUNC)) { 183 if (vp->v_type == VDIR) { 184 error = EISDIR; 185 goto bad; 186 } 187 if ((error = vn_writechk(vp)) != 0 || 188 (error = VOP_ACCESS(vp, VWRITE, cred, l)) != 0) 189 goto bad; 190 } 191 } 192 193 if (fmode & O_TRUNC) { 194 VOP_UNLOCK(vp, 0); /* XXX */ 195 196 VOP_LEASE(vp, l, cred, LEASE_WRITE); 197 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 198 VATTR_NULL(&va); 199 va.va_size = 0; 200 error = VOP_SETATTR(vp, &va, cred, l); 201 if (error != 0) 202 goto bad; 203 } 204 if ((error = VOP_OPEN(vp, fmode, cred, l)) != 0) 205 goto bad; 206 if (fmode & FWRITE) 207 vp->v_writecount++; 208 209 bad: 210 if (error) 211 vput(vp); 212 out: 213 VERIEXEC_PATH_PUT(path); 214 return (error); 215 } 216 217 /* 218 * Check for write permissions on the specified vnode. 219 * Prototype text segments cannot be written. 220 */ 221 int 222 vn_writechk(struct vnode *vp) 223 { 224 225 /* 226 * If the vnode is in use as a process's text, 227 * we can't allow writing. 228 */ 229 if (vp->v_flag & VTEXT) 230 return (ETXTBSY); 231 return (0); 232 } 233 234 /* 235 * Mark a vnode as having executable mappings. 236 */ 237 void 238 vn_markexec(struct vnode *vp) 239 { 240 if ((vp->v_flag & VEXECMAP) == 0) { 241 uvmexp.filepages -= vp->v_uobj.uo_npages; 242 uvmexp.execpages += vp->v_uobj.uo_npages; 243 } 244 vp->v_flag |= VEXECMAP; 245 } 246 247 /* 248 * Mark a vnode as being the text of a process. 249 * Fail if the vnode is currently writable. 250 */ 251 int 252 vn_marktext(struct vnode *vp) 253 { 254 255 if (vp->v_writecount != 0) { 256 KASSERT((vp->v_flag & VTEXT) == 0); 257 return (ETXTBSY); 258 } 259 vp->v_flag |= VTEXT; 260 vn_markexec(vp); 261 return (0); 262 } 263 264 /* 265 * Vnode close call 266 * 267 * Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node. 268 */ 269 int 270 vn_close(struct vnode *vp, int flags, kauth_cred_t cred, struct lwp *l) 271 { 272 int error; 273 274 if (flags & FWRITE) 275 vp->v_writecount--; 276 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 277 error = VOP_CLOSE(vp, flags, cred, l); 278 vput(vp); 279 return (error); 280 } 281 282 /* 283 * Package up an I/O request on a vnode into a uio and do it. 284 */ 285 int 286 vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset, 287 enum uio_seg segflg, int ioflg, kauth_cred_t cred, size_t *aresid, 288 struct lwp *l) 289 { 290 struct uio auio; 291 struct iovec aiov; 292 int error; 293 294 if ((ioflg & IO_NODELOCKED) == 0) { 295 if (rw == UIO_READ) { 296 vn_lock(vp, LK_SHARED | LK_RETRY); 297 } else /* UIO_WRITE */ { 298 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 299 } 300 } 301 auio.uio_iov = &aiov; 302 auio.uio_iovcnt = 1; 303 aiov.iov_base = base; 304 aiov.iov_len = len; 305 auio.uio_resid = len; 306 auio.uio_offset = offset; 307 auio.uio_rw = rw; 308 if (segflg == UIO_SYSSPACE) { 309 UIO_SETUP_SYSSPACE(&auio); 310 } else { 311 auio.uio_vmspace = l->l_proc->p_vmspace; 312 } 313 if (rw == UIO_READ) { 314 error = VOP_READ(vp, &auio, ioflg, cred); 315 } else { 316 error = VOP_WRITE(vp, &auio, ioflg, cred); 317 } 318 if (aresid) 319 *aresid = auio.uio_resid; 320 else 321 if (auio.uio_resid && error == 0) 322 error = EIO; 323 if ((ioflg & IO_NODELOCKED) == 0) { 324 VOP_UNLOCK(vp, 0); 325 } 326 return (error); 327 } 328 329 int 330 vn_readdir(struct file *fp, char *bf, int segflg, u_int count, int *done, 331 struct lwp *l, off_t **cookies, int *ncookies) 332 { 333 struct vnode *vp = (struct vnode *)fp->f_data; 334 struct iovec aiov; 335 struct uio auio; 336 int error, eofflag; 337 338 /* Limit the size on any kernel buffers used by VOP_READDIR */ 339 count = min(MAXBSIZE, count); 340 341 unionread: 342 if (vp->v_type != VDIR) 343 return (EINVAL); 344 aiov.iov_base = bf; 345 aiov.iov_len = count; 346 auio.uio_iov = &aiov; 347 auio.uio_iovcnt = 1; 348 auio.uio_rw = UIO_READ; 349 if (segflg == UIO_SYSSPACE) { 350 UIO_SETUP_SYSSPACE(&auio); 351 } else { 352 KASSERT(l == curlwp); 353 auio.uio_vmspace = l->l_proc->p_vmspace; 354 } 355 auio.uio_resid = count; 356 vn_lock(vp, LK_SHARED | LK_RETRY); 357 auio.uio_offset = fp->f_offset; 358 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookies, 359 ncookies); 360 mutex_enter(&fp->f_lock); 361 fp->f_offset = auio.uio_offset; 362 mutex_exit(&fp->f_lock); 363 VOP_UNLOCK(vp, 0); 364 if (error) 365 return (error); 366 367 #if defined(UNION) || defined(LKM) 368 if (count == auio.uio_resid && vn_union_readdir_hook) { 369 struct vnode *ovp = vp; 370 371 error = (*vn_union_readdir_hook)(&vp, fp, l); 372 if (error) 373 return (error); 374 if (vp != ovp) 375 goto unionread; 376 } 377 #endif /* UNION || LKM */ 378 379 if (count == auio.uio_resid && (vp->v_flag & VROOT) && 380 (vp->v_mount->mnt_flag & MNT_UNION)) { 381 struct vnode *tvp = vp; 382 vp = vp->v_mount->mnt_vnodecovered; 383 VREF(vp); 384 mutex_enter(&fp->f_lock); 385 fp->f_data = vp; 386 fp->f_offset = 0; 387 mutex_exit(&fp->f_lock); 388 vrele(tvp); 389 goto unionread; 390 } 391 *done = count - auio.uio_resid; 392 return error; 393 } 394 395 /* 396 * File table vnode read routine. 397 */ 398 static int 399 vn_read(struct file *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 400 int flags) 401 { 402 struct vnode *vp = (struct vnode *)fp->f_data; 403 int count, error, ioflag; 404 struct lwp *l = curlwp; 405 406 VOP_LEASE(vp, l, cred, LEASE_READ); 407 mutex_enter(&fp->f_lock); 408 ioflag = IO_ADV_ENCODE(fp->f_advice); 409 if (fp->f_flag & FNONBLOCK) 410 ioflag |= IO_NDELAY; 411 if ((fp->f_flag & (FFSYNC | FRSYNC)) == (FFSYNC | FRSYNC)) 412 ioflag |= IO_SYNC; 413 if (fp->f_flag & FALTIO) 414 ioflag |= IO_ALTSEMANTICS; 415 if (fp->f_flag & FDIRECT) 416 ioflag |= IO_DIRECT; 417 mutex_exit(&fp->f_lock); 418 vn_lock(vp, LK_SHARED | LK_RETRY); 419 uio->uio_offset = *offset; 420 count = uio->uio_resid; 421 error = VOP_READ(vp, uio, ioflag, cred); 422 if (flags & FOF_UPDATE_OFFSET) 423 *offset += count - uio->uio_resid; 424 VOP_UNLOCK(vp, 0); 425 return (error); 426 } 427 428 /* 429 * File table vnode write routine. 430 */ 431 static int 432 vn_write(struct file *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 433 int flags) 434 { 435 struct vnode *vp = (struct vnode *)fp->f_data; 436 int count, error, ioflag = IO_UNIT; 437 struct lwp *l = curlwp; 438 439 mutex_enter(&fp->f_lock); 440 if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) 441 ioflag |= IO_APPEND; 442 if (fp->f_flag & FNONBLOCK) 443 ioflag |= IO_NDELAY; 444 if (fp->f_flag & FFSYNC || 445 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 446 ioflag |= IO_SYNC; 447 else if (fp->f_flag & FDSYNC) 448 ioflag |= IO_DSYNC; 449 if (fp->f_flag & FALTIO) 450 ioflag |= IO_ALTSEMANTICS; 451 if (fp->f_flag & FDIRECT) 452 ioflag |= IO_DIRECT; 453 mutex_exit(&fp->f_lock); 454 VOP_LEASE(vp, l, cred, LEASE_WRITE); 455 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 456 uio->uio_offset = *offset; 457 count = uio->uio_resid; 458 error = VOP_WRITE(vp, uio, ioflag, cred); 459 if (flags & FOF_UPDATE_OFFSET) { 460 if (ioflag & IO_APPEND) 461 *offset = uio->uio_offset; 462 else 463 *offset += count - uio->uio_resid; 464 } 465 VOP_UNLOCK(vp, 0); 466 return (error); 467 } 468 469 /* 470 * File table vnode stat routine. 471 */ 472 static int 473 vn_statfile(struct file *fp, struct stat *sb, struct lwp *l) 474 { 475 struct vnode *vp = (struct vnode *)fp->f_data; 476 477 return vn_stat(vp, sb, l); 478 } 479 480 int 481 vn_stat(struct vnode *vp, struct stat *sb, struct lwp *l) 482 { 483 struct vattr va; 484 int error; 485 mode_t mode; 486 487 error = VOP_GETATTR(vp, &va, l->l_cred, l); 488 if (error) 489 return (error); 490 /* 491 * Copy from vattr table 492 */ 493 sb->st_dev = va.va_fsid; 494 sb->st_ino = va.va_fileid; 495 mode = va.va_mode; 496 switch (vp->v_type) { 497 case VREG: 498 mode |= S_IFREG; 499 break; 500 case VDIR: 501 mode |= S_IFDIR; 502 break; 503 case VBLK: 504 mode |= S_IFBLK; 505 break; 506 case VCHR: 507 mode |= S_IFCHR; 508 break; 509 case VLNK: 510 mode |= S_IFLNK; 511 break; 512 case VSOCK: 513 mode |= S_IFSOCK; 514 break; 515 case VFIFO: 516 mode |= S_IFIFO; 517 break; 518 default: 519 return (EBADF); 520 }; 521 sb->st_mode = mode; 522 sb->st_nlink = va.va_nlink; 523 sb->st_uid = va.va_uid; 524 sb->st_gid = va.va_gid; 525 sb->st_rdev = va.va_rdev; 526 sb->st_size = va.va_size; 527 sb->st_atimespec = va.va_atime; 528 sb->st_mtimespec = va.va_mtime; 529 sb->st_ctimespec = va.va_ctime; 530 sb->st_birthtimespec = va.va_birthtime; 531 sb->st_blksize = va.va_blocksize; 532 sb->st_flags = va.va_flags; 533 sb->st_gen = 0; 534 sb->st_blocks = va.va_bytes / S_BLKSIZE; 535 return (0); 536 } 537 538 /* 539 * File table vnode fcntl routine. 540 */ 541 static int 542 vn_fcntl(struct file *fp, u_int com, void *data, struct lwp *l) 543 { 544 struct vnode *vp = ((struct vnode *)fp->f_data); 545 int error; 546 547 error = VOP_FCNTL(vp, com, data, fp->f_flag, l->l_cred, l); 548 return (error); 549 } 550 551 /* 552 * File table vnode ioctl routine. 553 */ 554 static int 555 vn_ioctl(struct file *fp, u_long com, void *data, struct lwp *l) 556 { 557 struct vnode *vp = ((struct vnode *)fp->f_data), *ovp; 558 struct proc *p = l->l_proc; 559 struct vattr vattr; 560 int error; 561 562 switch (vp->v_type) { 563 564 case VREG: 565 case VDIR: 566 if (com == FIONREAD) { 567 error = VOP_GETATTR(vp, &vattr, l->l_cred, l); 568 if (error) 569 return (error); 570 *(int *)data = vattr.va_size - fp->f_offset; 571 return (0); 572 } 573 if ((com == FIONWRITE) || (com == FIONSPACE)) { 574 /* 575 * Files don't have send queues, so there never 576 * are any bytes in them, nor is there any 577 * open space in them. 578 */ 579 *(int *)data = 0; 580 return (0); 581 } 582 if (com == FIOGETBMAP) { 583 daddr_t *block; 584 585 if (*(daddr_t *)data < 0) 586 return (EINVAL); 587 block = (daddr_t *)data; 588 return (VOP_BMAP(vp, *block, NULL, block, NULL)); 589 } 590 if (com == OFIOGETBMAP) { 591 daddr_t ibn, obn; 592 593 if (*(int32_t *)data < 0) 594 return (EINVAL); 595 ibn = (daddr_t)*(int32_t *)data; 596 error = VOP_BMAP(vp, ibn, NULL, &obn, NULL); 597 *(int32_t *)data = (int32_t)obn; 598 return error; 599 } 600 if (com == FIONBIO || com == FIOASYNC) /* XXX */ 601 return (0); /* XXX */ 602 /* fall into ... */ 603 case VFIFO: 604 case VCHR: 605 case VBLK: 606 error = VOP_IOCTL(vp, com, data, fp->f_flag, 607 l->l_cred, l); 608 if (error == 0 && com == TIOCSCTTY) { 609 VREF(vp); 610 mutex_enter(&proclist_lock); 611 ovp = p->p_session->s_ttyvp; 612 p->p_session->s_ttyvp = vp; 613 mutex_exit(&proclist_lock); 614 if (ovp != NULL) 615 vrele(ovp); 616 } 617 return (error); 618 619 default: 620 return (EPASSTHROUGH); 621 } 622 } 623 624 /* 625 * File table vnode poll routine. 626 */ 627 static int 628 vn_poll(struct file *fp, int events, struct lwp *l) 629 { 630 631 return (VOP_POLL(((struct vnode *)fp->f_data), events, l)); 632 } 633 634 /* 635 * File table vnode kqfilter routine. 636 */ 637 int 638 vn_kqfilter(struct file *fp, struct knote *kn) 639 { 640 641 return (VOP_KQFILTER((struct vnode *)fp->f_data, kn)); 642 } 643 644 /* 645 * Check that the vnode is still valid, and if so 646 * acquire requested lock. 647 */ 648 int 649 vn_lock(struct vnode *vp, int flags) 650 { 651 int error; 652 653 #if 0 654 KASSERT(vp->v_usecount > 0 || (flags & LK_INTERLOCK) != 0 655 || (vp->v_flag & VONWORKLST) != 0); 656 #endif 657 KASSERT((flags & 658 ~(LK_INTERLOCK|LK_SHARED|LK_EXCLUSIVE|LK_DRAIN|LK_NOWAIT|LK_RETRY| 659 LK_SETRECURSE|LK_CANRECURSE)) 660 == 0); 661 662 do { 663 if ((flags & LK_INTERLOCK) == 0) 664 simple_lock(&vp->v_interlock); 665 if (vp->v_flag & VXLOCK) { 666 if (flags & LK_NOWAIT) { 667 simple_unlock(&vp->v_interlock); 668 return EBUSY; 669 } 670 vp->v_flag |= VXWANT; 671 ltsleep(vp, PINOD | PNORELOCK, 672 "vn_lock", 0, &vp->v_interlock); 673 error = ENOENT; 674 } else { 675 error = VOP_LOCK(vp, 676 (flags & ~LK_RETRY) | LK_INTERLOCK); 677 if (error == 0 || error == EDEADLK || error == EBUSY) 678 return (error); 679 } 680 flags &= ~LK_INTERLOCK; 681 } while (flags & LK_RETRY); 682 return (error); 683 } 684 685 /* 686 * File table vnode close routine. 687 */ 688 static int 689 vn_closefile(struct file *fp, struct lwp *l) 690 { 691 692 return (vn_close(((struct vnode *)fp->f_data), fp->f_flag, 693 fp->f_cred, l)); 694 } 695 696 /* 697 * Enable LK_CANRECURSE on lock. Return prior status. 698 */ 699 u_int 700 vn_setrecurse(struct vnode *vp) 701 { 702 struct lock *lkp = &vp->v_lock; 703 u_int retval = lkp->lk_flags & LK_CANRECURSE; 704 705 lkp->lk_flags |= LK_CANRECURSE; 706 return retval; 707 } 708 709 /* 710 * Called when done with locksetrecurse. 711 */ 712 void 713 vn_restorerecurse(struct vnode *vp, u_int flags) 714 { 715 struct lock *lkp = &vp->v_lock; 716 717 lkp->lk_flags &= ~LK_CANRECURSE; 718 lkp->lk_flags |= flags; 719 } 720 721 /* 722 * Obsolete: this function will be removed from 6.0 723 * Please use fscow_establish() instead. 724 */ 725 int 726 vn_cow_establish(struct vnode *vp, 727 int (*func)(void *, struct buf *), void *cookie) 728 { 729 static int firstrun = 1; 730 731 if (firstrun) { 732 printf("%s: this function is obsolete.\n", __FUNCTION__); 733 firstrun = 0; 734 } 735 if (vp->v_type == VBLK) 736 return fscow_establish(vp->v_specmountpoint, func, cookie); 737 else 738 return fscow_establish(vp->v_mount, func, cookie); 739 } 740 741 /* 742 * Obsolete: this function will be removed from 6.0 743 * Please use fscow_disestablish() instead. 744 */ 745 int 746 vn_cow_disestablish(struct vnode *vp, 747 int (*func)(void *, struct buf *), void *cookie) 748 { 749 if (vp->v_type == VBLK) 750 return fscow_disestablish(vp->v_specmountpoint, func, cookie); 751 else 752 return fscow_disestablish(vp->v_mount, func, cookie); 753 } 754 755 /* 756 * Simplified in-kernel wrapper calls for extended attribute access. 757 * Both calls pass in a NULL credential, authorizing a "kernel" access. 758 * Set IO_NODELOCKED in ioflg if the vnode is already locked. 759 */ 760 int 761 vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, 762 const char *attrname, size_t *buflen, void *bf, struct lwp *l) 763 { 764 struct uio auio; 765 struct iovec aiov; 766 int error; 767 768 aiov.iov_len = *buflen; 769 aiov.iov_base = bf; 770 771 auio.uio_iov = &aiov; 772 auio.uio_iovcnt = 1; 773 auio.uio_rw = UIO_READ; 774 auio.uio_offset = 0; 775 auio.uio_resid = *buflen; 776 UIO_SETUP_SYSSPACE(&auio); 777 778 if ((ioflg & IO_NODELOCKED) == 0) 779 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 780 781 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL, 782 l); 783 784 if ((ioflg & IO_NODELOCKED) == 0) 785 VOP_UNLOCK(vp, 0); 786 787 if (error == 0) 788 *buflen = *buflen - auio.uio_resid; 789 790 return (error); 791 } 792 793 /* 794 * XXX Failure mode if partially written? 795 */ 796 int 797 vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, 798 const char *attrname, size_t buflen, const void *bf, struct lwp *l) 799 { 800 struct uio auio; 801 struct iovec aiov; 802 int error; 803 804 aiov.iov_len = buflen; 805 aiov.iov_base = __UNCONST(bf); /* XXXUNCONST kills const */ 806 807 auio.uio_iov = &aiov; 808 auio.uio_iovcnt = 1; 809 auio.uio_rw = UIO_WRITE; 810 auio.uio_offset = 0; 811 auio.uio_resid = buflen; 812 UIO_SETUP_SYSSPACE(&auio); 813 814 if ((ioflg & IO_NODELOCKED) == 0) { 815 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 816 } 817 818 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, l); 819 820 if ((ioflg & IO_NODELOCKED) == 0) { 821 VOP_UNLOCK(vp, 0); 822 } 823 824 return (error); 825 } 826 827 int 828 vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, 829 const char *attrname, struct lwp *l) 830 { 831 int error; 832 833 if ((ioflg & IO_NODELOCKED) == 0) { 834 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 835 } 836 837 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL, l); 838 if (error == EOPNOTSUPP) 839 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, 840 NULL, l); 841 842 if ((ioflg & IO_NODELOCKED) == 0) { 843 VOP_UNLOCK(vp, 0); 844 } 845 846 return (error); 847 } 848 849 void 850 vn_ra_allocctx(struct vnode *vp) 851 { 852 struct uvm_ractx *ra = NULL; 853 854 if (vp->v_type != VREG) { 855 return; 856 } 857 if (vp->v_ractx != NULL) { 858 return; 859 } 860 simple_lock(&vp->v_interlock); 861 if (vp->v_ractx == NULL) { 862 simple_unlock(&vp->v_interlock); 863 ra = uvm_ra_allocctx(); 864 simple_lock(&vp->v_interlock); 865 if (ra != NULL && vp->v_ractx == NULL) { 866 vp->v_ractx = ra; 867 ra = NULL; 868 } 869 } 870 simple_unlock(&vp->v_interlock); 871 if (ra != NULL) { 872 uvm_ra_freectx(ra); 873 } 874 } 875
Indexes created Mon Sep 22 13:09:51 GMT 2025