vfs_vnops.c revision 1.135.2.9
1 /* $NetBSD: vfs_vnops.c,v 1.135.2.9 2007/10/09 15:22:23 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 1.135.2.9 2007/10/09 15:22:23 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 mutex_enter(&vp->v_interlock); 208 vp->v_writecount++; 209 mutex_exit(&vp->v_interlock); 210 } 211 212 bad: 213 if (error) 214 vput(vp); 215 out: 216 VERIEXEC_PATH_PUT(path); 217 return (error); 218 } 219 220 /* 221 * Check for write permissions on the specified vnode. 222 * Prototype text segments cannot be written. 223 */ 224 int 225 vn_writechk(struct vnode *vp) 226 { 227 228 /* 229 * If the vnode is in use as a process's text, 230 * we can't allow writing. 231 */ 232 if (vp->v_iflag & VI_TEXT) 233 return (ETXTBSY); 234 return (0); 235 } 236 237 /* 238 * Mark a vnode as having executable mappings. 239 */ 240 void 241 vn_markexec(struct vnode *vp) 242 { 243 244 KASSERT(mutex_owned(&vp->v_interlock)); 245 246 if ((vp->v_iflag & VI_EXECMAP) == 0) { 247 /* XXXSMP should be atomic */ 248 uvmexp.filepages -= vp->v_uobj.uo_npages; 249 uvmexp.execpages += vp->v_uobj.uo_npages; 250 } 251 vp->v_iflag |= VI_EXECMAP; 252 } 253 254 /* 255 * Mark a vnode as being the text of a process. 256 * Fail if the vnode is currently writable. 257 */ 258 int 259 vn_marktext(struct vnode *vp) 260 { 261 262 mutex_enter(&vp->v_interlock); 263 if (vp->v_writecount != 0) { 264 KASSERT((vp->v_iflag & VI_TEXT) == 0); 265 mutex_exit(&vp->v_interlock); 266 return (ETXTBSY); 267 } 268 vp->v_iflag |= VI_TEXT; 269 vn_markexec(vp); 270 mutex_exit(&vp->v_interlock); 271 return (0); 272 } 273 274 /* 275 * Vnode close call 276 * 277 * Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node. 278 */ 279 int 280 vn_close(struct vnode *vp, int flags, kauth_cred_t cred, struct lwp *l) 281 { 282 int error; 283 284 mutex_enter(&vp->v_interlock); 285 if (flags & FWRITE) 286 vp->v_writecount--; 287 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_INTERLOCK); 288 error = VOP_CLOSE(vp, flags, cred, l); 289 vput(vp); 290 return (error); 291 } 292 293 /* 294 * Package up an I/O request on a vnode into a uio and do it. 295 */ 296 int 297 vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset, 298 enum uio_seg segflg, int ioflg, kauth_cred_t cred, size_t *aresid, 299 struct lwp *l) 300 { 301 struct uio auio; 302 struct iovec aiov; 303 int error; 304 305 if ((ioflg & IO_NODELOCKED) == 0) { 306 if (rw == UIO_READ) { 307 vn_lock(vp, LK_SHARED | LK_RETRY); 308 } else /* UIO_WRITE */ { 309 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 310 } 311 } 312 auio.uio_iov = &aiov; 313 auio.uio_iovcnt = 1; 314 aiov.iov_base = base; 315 aiov.iov_len = len; 316 auio.uio_resid = len; 317 auio.uio_offset = offset; 318 auio.uio_rw = rw; 319 if (segflg == UIO_SYSSPACE) { 320 UIO_SETUP_SYSSPACE(&auio); 321 } else { 322 auio.uio_vmspace = l->l_proc->p_vmspace; 323 } 324 if (rw == UIO_READ) { 325 error = VOP_READ(vp, &auio, ioflg, cred); 326 } else { 327 error = VOP_WRITE(vp, &auio, ioflg, cred); 328 } 329 if (aresid) 330 *aresid = auio.uio_resid; 331 else 332 if (auio.uio_resid && error == 0) 333 error = EIO; 334 if ((ioflg & IO_NODELOCKED) == 0) { 335 VOP_UNLOCK(vp, 0); 336 } 337 return (error); 338 } 339 340 int 341 vn_readdir(struct file *fp, char *bf, int segflg, u_int count, int *done, 342 struct lwp *l, off_t **cookies, int *ncookies) 343 { 344 struct vnode *vp = (struct vnode *)fp->f_data; 345 struct iovec aiov; 346 struct uio auio; 347 int error, eofflag; 348 349 /* Limit the size on any kernel buffers used by VOP_READDIR */ 350 count = min(MAXBSIZE, count); 351 352 unionread: 353 if (vp->v_type != VDIR) 354 return (EINVAL); 355 aiov.iov_base = bf; 356 aiov.iov_len = count; 357 auio.uio_iov = &aiov; 358 auio.uio_iovcnt = 1; 359 auio.uio_rw = UIO_READ; 360 if (segflg == UIO_SYSSPACE) { 361 UIO_SETUP_SYSSPACE(&auio); 362 } else { 363 KASSERT(l == curlwp); 364 auio.uio_vmspace = l->l_proc->p_vmspace; 365 } 366 auio.uio_resid = count; 367 vn_lock(vp, LK_SHARED | LK_RETRY); 368 auio.uio_offset = fp->f_offset; 369 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookies, 370 ncookies); 371 mutex_enter(&fp->f_lock); 372 fp->f_offset = auio.uio_offset; 373 mutex_exit(&fp->f_lock); 374 VOP_UNLOCK(vp, 0); 375 if (error) 376 return (error); 377 378 #if defined(UNION) || defined(LKM) 379 if (count == auio.uio_resid && vn_union_readdir_hook) { 380 struct vnode *ovp = vp; 381 382 error = (*vn_union_readdir_hook)(&vp, fp, l); 383 if (error) 384 return (error); 385 if (vp != ovp) 386 goto unionread; 387 } 388 #endif /* UNION || LKM */ 389 390 if (count == auio.uio_resid && (vp->v_vflag & VV_ROOT) && 391 (vp->v_mount->mnt_flag & MNT_UNION)) { 392 struct vnode *tvp = vp; 393 vp = vp->v_mount->mnt_vnodecovered; 394 VREF(vp); 395 mutex_enter(&fp->f_lock); 396 fp->f_data = vp; 397 fp->f_offset = 0; 398 mutex_exit(&fp->f_lock); 399 vrele(tvp); 400 goto unionread; 401 } 402 *done = count - auio.uio_resid; 403 return error; 404 } 405 406 /* 407 * File table vnode read routine. 408 */ 409 static int 410 vn_read(struct file *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 411 int flags) 412 { 413 struct vnode *vp = (struct vnode *)fp->f_data; 414 int count, error, ioflag; 415 struct lwp *l = curlwp; 416 417 VOP_LEASE(vp, l, cred, LEASE_READ); 418 mutex_enter(&fp->f_lock); 419 ioflag = IO_ADV_ENCODE(fp->f_advice); 420 if (fp->f_flag & FNONBLOCK) 421 ioflag |= IO_NDELAY; 422 if ((fp->f_flag & (FFSYNC | FRSYNC)) == (FFSYNC | FRSYNC)) 423 ioflag |= IO_SYNC; 424 if (fp->f_flag & FALTIO) 425 ioflag |= IO_ALTSEMANTICS; 426 if (fp->f_flag & FDIRECT) 427 ioflag |= IO_DIRECT; 428 mutex_exit(&fp->f_lock); 429 vn_lock(vp, LK_SHARED | LK_RETRY); 430 uio->uio_offset = *offset; 431 count = uio->uio_resid; 432 error = VOP_READ(vp, uio, ioflag, cred); 433 if (flags & FOF_UPDATE_OFFSET) 434 *offset += count - uio->uio_resid; 435 VOP_UNLOCK(vp, 0); 436 return (error); 437 } 438 439 /* 440 * File table vnode write routine. 441 */ 442 static int 443 vn_write(struct file *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 444 int flags) 445 { 446 struct vnode *vp = (struct vnode *)fp->f_data; 447 int count, error, ioflag = IO_UNIT; 448 struct lwp *l = curlwp; 449 450 mutex_enter(&fp->f_lock); 451 if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) 452 ioflag |= IO_APPEND; 453 if (fp->f_flag & FNONBLOCK) 454 ioflag |= IO_NDELAY; 455 if (fp->f_flag & FFSYNC || 456 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 457 ioflag |= IO_SYNC; 458 else if (fp->f_flag & FDSYNC) 459 ioflag |= IO_DSYNC; 460 if (fp->f_flag & FALTIO) 461 ioflag |= IO_ALTSEMANTICS; 462 if (fp->f_flag & FDIRECT) 463 ioflag |= IO_DIRECT; 464 mutex_exit(&fp->f_lock); 465 VOP_LEASE(vp, l, cred, LEASE_WRITE); 466 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 467 uio->uio_offset = *offset; 468 count = uio->uio_resid; 469 error = VOP_WRITE(vp, uio, ioflag, cred); 470 if (flags & FOF_UPDATE_OFFSET) { 471 if (ioflag & IO_APPEND) 472 *offset = uio->uio_offset; 473 else 474 *offset += count - uio->uio_resid; 475 } 476 VOP_UNLOCK(vp, 0); 477 return (error); 478 } 479 480 /* 481 * File table vnode stat routine. 482 */ 483 static int 484 vn_statfile(struct file *fp, struct stat *sb, struct lwp *l) 485 { 486 struct vnode *vp = (struct vnode *)fp->f_data; 487 488 return vn_stat(vp, sb, l); 489 } 490 491 int 492 vn_stat(struct vnode *vp, struct stat *sb, struct lwp *l) 493 { 494 struct vattr va; 495 int error; 496 mode_t mode; 497 498 error = VOP_GETATTR(vp, &va, l->l_cred, l); 499 if (error) 500 return (error); 501 /* 502 * Copy from vattr table 503 */ 504 sb->st_dev = va.va_fsid; 505 sb->st_ino = va.va_fileid; 506 mode = va.va_mode; 507 switch (vp->v_type) { 508 case VREG: 509 mode |= S_IFREG; 510 break; 511 case VDIR: 512 mode |= S_IFDIR; 513 break; 514 case VBLK: 515 mode |= S_IFBLK; 516 break; 517 case VCHR: 518 mode |= S_IFCHR; 519 break; 520 case VLNK: 521 mode |= S_IFLNK; 522 break; 523 case VSOCK: 524 mode |= S_IFSOCK; 525 break; 526 case VFIFO: 527 mode |= S_IFIFO; 528 break; 529 default: 530 return (EBADF); 531 }; 532 sb->st_mode = mode; 533 sb->st_nlink = va.va_nlink; 534 sb->st_uid = va.va_uid; 535 sb->st_gid = va.va_gid; 536 sb->st_rdev = va.va_rdev; 537 sb->st_size = va.va_size; 538 sb->st_atimespec = va.va_atime; 539 sb->st_mtimespec = va.va_mtime; 540 sb->st_ctimespec = va.va_ctime; 541 sb->st_birthtimespec = va.va_birthtime; 542 sb->st_blksize = va.va_blocksize; 543 sb->st_flags = va.va_flags; 544 sb->st_gen = 0; 545 sb->st_blocks = va.va_bytes / S_BLKSIZE; 546 return (0); 547 } 548 549 /* 550 * File table vnode fcntl routine. 551 */ 552 static int 553 vn_fcntl(struct file *fp, u_int com, void *data, struct lwp *l) 554 { 555 struct vnode *vp = ((struct vnode *)fp->f_data); 556 int error; 557 558 error = VOP_FCNTL(vp, com, data, fp->f_flag, l->l_cred, l); 559 return (error); 560 } 561 562 /* 563 * File table vnode ioctl routine. 564 */ 565 static int 566 vn_ioctl(struct file *fp, u_long com, void *data, struct lwp *l) 567 { 568 struct vnode *vp = ((struct vnode *)fp->f_data), *ovp; 569 struct proc *p = l->l_proc; 570 struct vattr vattr; 571 int error; 572 573 switch (vp->v_type) { 574 575 case VREG: 576 case VDIR: 577 if (com == FIONREAD) { 578 error = VOP_GETATTR(vp, &vattr, l->l_cred, l); 579 if (error) 580 return (error); 581 *(int *)data = vattr.va_size - fp->f_offset; 582 return (0); 583 } 584 if ((com == FIONWRITE) || (com == FIONSPACE)) { 585 /* 586 * Files don't have send queues, so there never 587 * are any bytes in them, nor is there any 588 * open space in them. 589 */ 590 *(int *)data = 0; 591 return (0); 592 } 593 if (com == FIOGETBMAP) { 594 daddr_t *block; 595 596 if (*(daddr_t *)data < 0) 597 return (EINVAL); 598 block = (daddr_t *)data; 599 return (VOP_BMAP(vp, *block, NULL, block, NULL)); 600 } 601 if (com == OFIOGETBMAP) { 602 daddr_t ibn, obn; 603 604 if (*(int32_t *)data < 0) 605 return (EINVAL); 606 ibn = (daddr_t)*(int32_t *)data; 607 error = VOP_BMAP(vp, ibn, NULL, &obn, NULL); 608 *(int32_t *)data = (int32_t)obn; 609 return error; 610 } 611 if (com == FIONBIO || com == FIOASYNC) /* XXX */ 612 return (0); /* XXX */ 613 /* fall into ... */ 614 case VFIFO: 615 case VCHR: 616 case VBLK: 617 error = VOP_IOCTL(vp, com, data, fp->f_flag, 618 l->l_cred, l); 619 if (error == 0 && com == TIOCSCTTY) { 620 VREF(vp); 621 mutex_enter(&proclist_lock); 622 ovp = p->p_session->s_ttyvp; 623 p->p_session->s_ttyvp = vp; 624 mutex_exit(&proclist_lock); 625 if (ovp != NULL) 626 vrele(ovp); 627 } 628 return (error); 629 630 default: 631 return (EPASSTHROUGH); 632 } 633 } 634 635 /* 636 * File table vnode poll routine. 637 */ 638 static int 639 vn_poll(struct file *fp, int events, struct lwp *l) 640 { 641 642 return (VOP_POLL(((struct vnode *)fp->f_data), events, l)); 643 } 644 645 /* 646 * File table vnode kqfilter routine. 647 */ 648 int 649 vn_kqfilter(struct file *fp, struct knote *kn) 650 { 651 652 return (VOP_KQFILTER((struct vnode *)fp->f_data, kn)); 653 } 654 655 /* 656 * Check that the vnode is still valid, and if so 657 * acquire requested lock. 658 */ 659 int 660 vn_lock(struct vnode *vp, int flags) 661 { 662 int error; 663 664 #if 0 665 KASSERT(vp->v_usecount > 0 || (flags & LK_INTERLOCK) != 0 666 || (vp->v_iflag & VI_ONWORKLST) != 0); 667 #endif 668 KASSERT((flags & 669 ~(LK_INTERLOCK|LK_SHARED|LK_EXCLUSIVE|LK_DRAIN|LK_NOWAIT|LK_RETRY| 670 LK_SETRECURSE|LK_CANRECURSE)) 671 == 0); 672 673 do { 674 if ((flags & LK_INTERLOCK) == 0) 675 mutex_enter(&vp->v_interlock); 676 if (vp->v_iflag & VI_XLOCK) { 677 if (flags & LK_NOWAIT) { 678 mutex_exit(&vp->v_interlock); 679 return EBUSY; 680 } 681 vwait(vp, VI_XLOCK); 682 mutex_exit(&vp->v_interlock); 683 error = ENOENT; 684 } else { 685 error = VOP_LOCK(vp, 686 (flags & ~LK_RETRY) | LK_INTERLOCK); 687 if (error == 0 || error == EDEADLK || error == EBUSY) 688 return (error); 689 } 690 flags &= ~LK_INTERLOCK; 691 } while (flags & LK_RETRY); 692 return (error); 693 } 694 695 /* 696 * File table vnode close routine. 697 */ 698 static int 699 vn_closefile(struct file *fp, struct lwp *l) 700 { 701 702 return (vn_close(((struct vnode *)fp->f_data), fp->f_flag, 703 fp->f_cred, l)); 704 } 705 706 /* 707 * Enable LK_CANRECURSE on lock. Return prior status. 708 */ 709 u_int 710 vn_setrecurse(struct vnode *vp) 711 { 712 struct lock *lkp = &vp->v_lock; 713 u_int retval; 714 715 mutex_enter(&lkp->lk_interlock); 716 retval = lkp->lk_flags & LK_CANRECURSE; 717 lkp->lk_flags |= LK_CANRECURSE; 718 mutex_exit(&lkp->lk_interlock); 719 720 return retval; 721 } 722 723 /* 724 * Called when done with locksetrecurse. 725 */ 726 void 727 vn_restorerecurse(struct vnode *vp, u_int flags) 728 { 729 struct lock *lkp = &vp->v_lock; 730 731 mutex_enter(&lkp->lk_interlock); 732 lkp->lk_flags &= ~LK_CANRECURSE; 733 lkp->lk_flags |= flags; 734 mutex_exit(&lkp->lk_interlock); 735 } 736 737 /* 738 * Obsolete: this function will be removed from 6.0 739 * Please use fscow_establish() instead. 740 */ 741 int 742 vn_cow_establish(struct vnode *vp, 743 int (*func)(void *, struct buf *), void *cookie) 744 { 745 static int firstrun = 1; 746 747 if (firstrun) { 748 printf("%s: this function is obsolete.\n", __FUNCTION__); 749 firstrun = 0; 750 } 751 if (vp->v_type == VBLK) 752 return fscow_establish(vp->v_specmountpoint, func, cookie); 753 else 754 return fscow_establish(vp->v_mount, func, cookie); 755 } 756 757 /* 758 * Obsolete: this function will be removed from 6.0 759 * Please use fscow_disestablish() instead. 760 */ 761 int 762 vn_cow_disestablish(struct vnode *vp, 763 int (*func)(void *, struct buf *), void *cookie) 764 { 765 if (vp->v_type == VBLK) 766 return fscow_disestablish(vp->v_specmountpoint, func, cookie); 767 else 768 return fscow_disestablish(vp->v_mount, func, cookie); 769 } 770 771 /* 772 * Simplified in-kernel wrapper calls for extended attribute access. 773 * Both calls pass in a NULL credential, authorizing a "kernel" access. 774 * Set IO_NODELOCKED in ioflg if the vnode is already locked. 775 */ 776 int 777 vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, 778 const char *attrname, size_t *buflen, void *bf, struct lwp *l) 779 { 780 struct uio auio; 781 struct iovec aiov; 782 int error; 783 784 aiov.iov_len = *buflen; 785 aiov.iov_base = bf; 786 787 auio.uio_iov = &aiov; 788 auio.uio_iovcnt = 1; 789 auio.uio_rw = UIO_READ; 790 auio.uio_offset = 0; 791 auio.uio_resid = *buflen; 792 UIO_SETUP_SYSSPACE(&auio); 793 794 if ((ioflg & IO_NODELOCKED) == 0) 795 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 796 797 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL, 798 l); 799 800 if ((ioflg & IO_NODELOCKED) == 0) 801 VOP_UNLOCK(vp, 0); 802 803 if (error == 0) 804 *buflen = *buflen - auio.uio_resid; 805 806 return (error); 807 } 808 809 /* 810 * XXX Failure mode if partially written? 811 */ 812 int 813 vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, 814 const char *attrname, size_t buflen, const void *bf, struct lwp *l) 815 { 816 struct uio auio; 817 struct iovec aiov; 818 int error; 819 820 aiov.iov_len = buflen; 821 aiov.iov_base = __UNCONST(bf); /* XXXUNCONST kills const */ 822 823 auio.uio_iov = &aiov; 824 auio.uio_iovcnt = 1; 825 auio.uio_rw = UIO_WRITE; 826 auio.uio_offset = 0; 827 auio.uio_resid = buflen; 828 UIO_SETUP_SYSSPACE(&auio); 829 830 if ((ioflg & IO_NODELOCKED) == 0) { 831 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 832 } 833 834 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, l); 835 836 if ((ioflg & IO_NODELOCKED) == 0) { 837 VOP_UNLOCK(vp, 0); 838 } 839 840 return (error); 841 } 842 843 int 844 vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, 845 const char *attrname, struct lwp *l) 846 { 847 int error; 848 849 if ((ioflg & IO_NODELOCKED) == 0) { 850 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 851 } 852 853 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL, l); 854 if (error == EOPNOTSUPP) 855 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, 856 NULL, l); 857 858 if ((ioflg & IO_NODELOCKED) == 0) { 859 VOP_UNLOCK(vp, 0); 860 } 861 862 return (error); 863 } 864 865 void 866 vn_ra_allocctx(struct vnode *vp) 867 { 868 struct uvm_ractx *ra = NULL; 869 870 if (vp->v_type != VREG) { 871 return; 872 } 873 if (vp->v_ractx != NULL) { 874 return; 875 } 876 mutex_enter(&vp->v_interlock); 877 if (vp->v_ractx == NULL) { 878 mutex_exit(&vp->v_interlock); 879 ra = uvm_ra_allocctx(); 880 mutex_enter(&vp->v_interlock); 881 if (ra != NULL && vp->v_ractx == NULL) { 882 vp->v_ractx = ra; 883 ra = NULL; 884 } 885 } 886 mutex_exit(&vp->v_interlock); 887 if (ra != NULL) { 888 uvm_ra_freectx(ra); 889 } 890 } 891
Indexes created Sat Sep 20 22:09:52 GMT 2025