vfs_vnops.c revision 1.160.4.1
1 /* $NetBSD: vfs_vnops.c,v 1.160.4.1 2009/04/04 23:36:28 snj Exp $ */ 2 3 /*- 4 * Copyright (c) 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * (c) UNIX System Laboratories, Inc. 36 * All or some portions of this file are derived from material licensed 37 * to the University of California by American Telephone and Telegraph 38 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 39 * the permission of UNIX System Laboratories, Inc. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)vfs_vnops.c 8.14 (Berkeley) 6/15/95 66 */ 67 68 #include <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: vfs_vnops.c,v 1.160.4.1 2009/04/04 23:36:28 snj Exp $"); 70 71 #include "fs_union.h" 72 #include "veriexec.h" 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/kernel.h> 77 #include <sys/file.h> 78 #include <sys/stat.h> 79 #include <sys/buf.h> 80 #include <sys/proc.h> 81 #include <sys/malloc.h> 82 #include <sys/mount.h> 83 #include <sys/namei.h> 84 #include <sys/vnode.h> 85 #include <sys/ioctl.h> 86 #include <sys/tty.h> 87 #include <sys/poll.h> 88 #include <sys/kauth.h> 89 #include <sys/syslog.h> 90 #include <sys/fstrans.h> 91 #include <sys/atomic.h> 92 #include <sys/filedesc.h> 93 #include <sys/wapbl.h> 94 95 #include <miscfs/specfs/specdev.h> 96 97 #include <uvm/uvm_extern.h> 98 #include <uvm/uvm_readahead.h> 99 100 #ifdef UNION 101 #include <fs/union/union.h> 102 #endif 103 104 #if defined(LKM) || defined(UNION) 105 int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct lwp *); 106 #endif 107 108 #include <sys/verified_exec.h> 109 110 static int vn_read(file_t *fp, off_t *offset, struct uio *uio, 111 kauth_cred_t cred, int flags); 112 static int vn_write(file_t *fp, off_t *offset, struct uio *uio, 113 kauth_cred_t cred, int flags); 114 static int vn_closefile(file_t *fp); 115 static int vn_poll(file_t *fp, int events); 116 static int vn_fcntl(file_t *fp, u_int com, void *data); 117 static int vn_statfile(file_t *fp, struct stat *sb); 118 static int vn_ioctl(file_t *fp, u_long com, void *data); 119 120 const struct fileops vnops = { 121 .fo_read = vn_read, 122 .fo_write = vn_write, 123 .fo_ioctl = vn_ioctl, 124 .fo_fcntl = vn_fcntl, 125 .fo_poll = vn_poll, 126 .fo_stat = vn_statfile, 127 .fo_close = vn_closefile, 128 .fo_kqfilter = vn_kqfilter, 129 .fo_drain = fnullop_drain, 130 }; 131 132 /* 133 * Common code for vnode open operations. 134 * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. 135 */ 136 int 137 vn_open(struct nameidata *ndp, int fmode, int cmode) 138 { 139 struct vnode *vp; 140 struct lwp *l = curlwp; 141 kauth_cred_t cred = l->l_cred; 142 struct vattr va; 143 int error; 144 char *path; 145 146 ndp->ni_cnd.cn_flags &= TRYEMULROOT; 147 148 if (fmode & O_CREAT) { 149 ndp->ni_cnd.cn_nameiop = CREATE; 150 ndp->ni_cnd.cn_flags |= LOCKPARENT | LOCKLEAF; 151 if ((fmode & O_EXCL) == 0 && 152 ((fmode & O_NOFOLLOW) == 0)) 153 ndp->ni_cnd.cn_flags |= FOLLOW; 154 } else { 155 ndp->ni_cnd.cn_nameiop = LOOKUP; 156 ndp->ni_cnd.cn_flags |= LOCKLEAF; 157 if ((fmode & O_NOFOLLOW) == 0) 158 ndp->ni_cnd.cn_flags |= FOLLOW; 159 } 160 161 VERIEXEC_PATH_GET(ndp->ni_dirp, ndp->ni_segflg, ndp->ni_dirp, path); 162 163 error = namei(ndp); 164 if (error) 165 goto out; 166 167 vp = ndp->ni_vp; 168 169 #if NVERIEXEC > 0 170 error = veriexec_openchk(l, ndp->ni_vp, ndp->ni_dirp, fmode); 171 if (error) 172 goto bad; 173 #endif /* NVERIEXEC > 0 */ 174 175 if (fmode & O_CREAT) { 176 if (ndp->ni_vp == NULL) { 177 VATTR_NULL(&va); 178 va.va_type = VREG; 179 va.va_mode = cmode; 180 if (fmode & O_EXCL) 181 va.va_vaflags |= VA_EXCLUSIVE; 182 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, 183 &ndp->ni_cnd, &va); 184 if (error) 185 goto out; 186 fmode &= ~O_TRUNC; 187 vp = ndp->ni_vp; 188 } else { 189 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 190 if (ndp->ni_dvp == ndp->ni_vp) 191 vrele(ndp->ni_dvp); 192 else 193 vput(ndp->ni_dvp); 194 ndp->ni_dvp = NULL; 195 vp = ndp->ni_vp; 196 if (fmode & O_EXCL) { 197 error = EEXIST; 198 goto bad; 199 } 200 fmode &= ~O_CREAT; 201 } 202 } else { 203 vp = ndp->ni_vp; 204 } 205 if (vp->v_type == VSOCK) { 206 error = EOPNOTSUPP; 207 goto bad; 208 } 209 if (ndp->ni_vp->v_type == VLNK) { 210 error = EFTYPE; 211 goto bad; 212 } 213 214 if ((fmode & O_CREAT) == 0) { 215 error = vn_openchk(vp, cred, fmode); 216 if (error != 0) 217 goto bad; 218 } 219 220 if (fmode & O_TRUNC) { 221 VOP_UNLOCK(vp, 0); /* XXX */ 222 223 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 224 VATTR_NULL(&va); 225 va.va_size = 0; 226 error = VOP_SETATTR(vp, &va, cred); 227 if (error != 0) 228 goto bad; 229 } 230 if ((error = VOP_OPEN(vp, fmode, cred)) != 0) 231 goto bad; 232 if (fmode & FWRITE) { 233 mutex_enter(&vp->v_interlock); 234 vp->v_writecount++; 235 mutex_exit(&vp->v_interlock); 236 } 237 238 bad: 239 if (error) 240 vput(vp); 241 out: 242 VERIEXEC_PATH_PUT(path); 243 return (error); 244 } 245 246 /* 247 * Check for write permissions on the specified vnode. 248 * Prototype text segments cannot be written. 249 */ 250 int 251 vn_writechk(struct vnode *vp) 252 { 253 254 /* 255 * If the vnode is in use as a process's text, 256 * we can't allow writing. 257 */ 258 if (vp->v_iflag & VI_TEXT) 259 return (ETXTBSY); 260 return (0); 261 } 262 263 int 264 vn_openchk(struct vnode *vp, kauth_cred_t cred, int fflags) 265 { 266 int permbits = 0; 267 int error; 268 269 if ((fflags & FREAD) != 0) { 270 permbits = VREAD; 271 } 272 if ((fflags & (FWRITE | O_TRUNC)) != 0) { 273 permbits |= VWRITE; 274 if (vp->v_type == VDIR) { 275 error = EISDIR; 276 goto bad; 277 } 278 error = vn_writechk(vp); 279 if (error != 0) 280 goto bad; 281 } 282 error = VOP_ACCESS(vp, permbits, cred); 283 bad: 284 return error; 285 } 286 287 /* 288 * Mark a vnode as having executable mappings. 289 */ 290 void 291 vn_markexec(struct vnode *vp) 292 { 293 294 if ((vp->v_iflag & VI_EXECMAP) != 0) { 295 /* Safe unlocked, as long as caller holds a reference. */ 296 return; 297 } 298 299 mutex_enter(&vp->v_interlock); 300 if ((vp->v_iflag & VI_EXECMAP) == 0) { 301 atomic_add_int(&uvmexp.filepages, -vp->v_uobj.uo_npages); 302 atomic_add_int(&uvmexp.execpages, vp->v_uobj.uo_npages); 303 vp->v_iflag |= VI_EXECMAP; 304 } 305 mutex_exit(&vp->v_interlock); 306 } 307 308 /* 309 * Mark a vnode as being the text of a process. 310 * Fail if the vnode is currently writable. 311 */ 312 int 313 vn_marktext(struct vnode *vp) 314 { 315 316 if ((vp->v_iflag & (VI_TEXT|VI_EXECMAP)) == (VI_TEXT|VI_EXECMAP)) { 317 /* Safe unlocked, as long as caller holds a reference. */ 318 return (0); 319 } 320 321 mutex_enter(&vp->v_interlock); 322 if (vp->v_writecount != 0) { 323 KASSERT((vp->v_iflag & VI_TEXT) == 0); 324 mutex_exit(&vp->v_interlock); 325 return (ETXTBSY); 326 } 327 if ((vp->v_iflag & VI_EXECMAP) == 0) { 328 atomic_add_int(&uvmexp.filepages, -vp->v_uobj.uo_npages); 329 atomic_add_int(&uvmexp.execpages, vp->v_uobj.uo_npages); 330 } 331 vp->v_iflag |= (VI_TEXT | VI_EXECMAP); 332 mutex_exit(&vp->v_interlock); 333 return (0); 334 } 335 336 /* 337 * Vnode close call 338 * 339 * Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node. 340 */ 341 int 342 vn_close(struct vnode *vp, int flags, kauth_cred_t cred) 343 { 344 int error; 345 346 if (flags & FWRITE) { 347 mutex_enter(&vp->v_interlock); 348 vp->v_writecount--; 349 mutex_exit(&vp->v_interlock); 350 } 351 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 352 error = VOP_CLOSE(vp, flags, cred); 353 vput(vp); 354 return (error); 355 } 356 357 /* 358 * Package up an I/O request on a vnode into a uio and do it. 359 */ 360 int 361 vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset, 362 enum uio_seg segflg, int ioflg, kauth_cred_t cred, size_t *aresid, 363 struct lwp *l) 364 { 365 struct uio auio; 366 struct iovec aiov; 367 int error; 368 369 if ((ioflg & IO_NODELOCKED) == 0) { 370 if (rw == UIO_READ) { 371 vn_lock(vp, LK_SHARED | LK_RETRY); 372 } else /* UIO_WRITE */ { 373 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 374 } 375 } 376 auio.uio_iov = &aiov; 377 auio.uio_iovcnt = 1; 378 aiov.iov_base = base; 379 aiov.iov_len = len; 380 auio.uio_resid = len; 381 auio.uio_offset = offset; 382 auio.uio_rw = rw; 383 if (segflg == UIO_SYSSPACE) { 384 UIO_SETUP_SYSSPACE(&auio); 385 } else { 386 auio.uio_vmspace = l->l_proc->p_vmspace; 387 } 388 if (rw == UIO_READ) { 389 error = VOP_READ(vp, &auio, ioflg, cred); 390 } else { 391 error = VOP_WRITE(vp, &auio, ioflg, cred); 392 } 393 if (aresid) 394 *aresid = auio.uio_resid; 395 else 396 if (auio.uio_resid && error == 0) 397 error = EIO; 398 if ((ioflg & IO_NODELOCKED) == 0) { 399 VOP_UNLOCK(vp, 0); 400 } 401 return (error); 402 } 403 404 int 405 vn_readdir(file_t *fp, char *bf, int segflg, u_int count, int *done, 406 struct lwp *l, off_t **cookies, int *ncookies) 407 { 408 struct vnode *vp = (struct vnode *)fp->f_data; 409 struct iovec aiov; 410 struct uio auio; 411 int error, eofflag; 412 413 /* Limit the size on any kernel buffers used by VOP_READDIR */ 414 count = min(MAXBSIZE, count); 415 416 unionread: 417 if (vp->v_type != VDIR) 418 return (EINVAL); 419 aiov.iov_base = bf; 420 aiov.iov_len = count; 421 auio.uio_iov = &aiov; 422 auio.uio_iovcnt = 1; 423 auio.uio_rw = UIO_READ; 424 if (segflg == UIO_SYSSPACE) { 425 UIO_SETUP_SYSSPACE(&auio); 426 } else { 427 KASSERT(l == curlwp); 428 auio.uio_vmspace = l->l_proc->p_vmspace; 429 } 430 auio.uio_resid = count; 431 vn_lock(vp, LK_SHARED | LK_RETRY); 432 auio.uio_offset = fp->f_offset; 433 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookies, 434 ncookies); 435 FILE_LOCK(fp); 436 fp->f_offset = auio.uio_offset; 437 FILE_UNLOCK(fp); 438 VOP_UNLOCK(vp, 0); 439 if (error) 440 return (error); 441 442 #if defined(UNION) || defined(LKM) 443 if (count == auio.uio_resid && vn_union_readdir_hook) { 444 struct vnode *ovp = vp; 445 446 error = (*vn_union_readdir_hook)(&vp, fp, l); 447 if (error) 448 return (error); 449 if (vp != ovp) 450 goto unionread; 451 } 452 #endif /* UNION || LKM */ 453 454 if (count == auio.uio_resid && (vp->v_vflag & VV_ROOT) && 455 (vp->v_mount->mnt_flag & MNT_UNION)) { 456 struct vnode *tvp = vp; 457 vp = vp->v_mount->mnt_vnodecovered; 458 VREF(vp); 459 FILE_LOCK(fp); 460 fp->f_data = vp; 461 fp->f_offset = 0; 462 FILE_UNLOCK(fp); 463 vrele(tvp); 464 goto unionread; 465 } 466 *done = count - auio.uio_resid; 467 return error; 468 } 469 470 /* 471 * File table vnode read routine. 472 */ 473 static int 474 vn_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 475 int flags) 476 { 477 struct vnode *vp = (struct vnode *)fp->f_data; 478 int count, error, ioflag, fflag; 479 480 ioflag = IO_ADV_ENCODE(fp->f_advice); 481 fflag = fp->f_flag; 482 if (fflag & FNONBLOCK) 483 ioflag |= IO_NDELAY; 484 if ((fflag & (FFSYNC | FRSYNC)) == (FFSYNC | FRSYNC)) 485 ioflag |= IO_SYNC; 486 if (fflag & FALTIO) 487 ioflag |= IO_ALTSEMANTICS; 488 if (fflag & FDIRECT) 489 ioflag |= IO_DIRECT; 490 vn_lock(vp, LK_SHARED | LK_RETRY); 491 uio->uio_offset = *offset; 492 count = uio->uio_resid; 493 error = VOP_READ(vp, uio, ioflag, cred); 494 if (flags & FOF_UPDATE_OFFSET) 495 *offset += count - uio->uio_resid; 496 VOP_UNLOCK(vp, 0); 497 return (error); 498 } 499 500 /* 501 * File table vnode write routine. 502 */ 503 static int 504 vn_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 505 int flags) 506 { 507 struct vnode *vp = (struct vnode *)fp->f_data; 508 int count, error, ioflag, fflag; 509 510 ioflag = IO_ADV_ENCODE(fp->f_advice) | IO_UNIT; 511 fflag = fp->f_flag; 512 if (vp->v_type == VREG && (fflag & O_APPEND)) 513 ioflag |= IO_APPEND; 514 if (fflag & FNONBLOCK) 515 ioflag |= IO_NDELAY; 516 if (fflag & FFSYNC || 517 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 518 ioflag |= IO_SYNC; 519 else if (fflag & FDSYNC) 520 ioflag |= IO_DSYNC; 521 if (fflag & FALTIO) 522 ioflag |= IO_ALTSEMANTICS; 523 if (fflag & FDIRECT) 524 ioflag |= IO_DIRECT; 525 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 526 uio->uio_offset = *offset; 527 count = uio->uio_resid; 528 error = VOP_WRITE(vp, uio, ioflag, cred); 529 if (flags & FOF_UPDATE_OFFSET) { 530 if (ioflag & IO_APPEND) { 531 /* 532 * SUSv3 describes behaviour for count = 0 as following: 533 * "Before any action ... is taken, and if nbyte is zero 534 * and the file is a regular file, the write() function 535 * ... in the absence of errors ... shall return zero 536 * and have no other results." 537 */ 538 if (count) 539 *offset = uio->uio_offset; 540 } else 541 *offset += count - uio->uio_resid; 542 } 543 VOP_UNLOCK(vp, 0); 544 return (error); 545 } 546 547 /* 548 * File table vnode stat routine. 549 */ 550 static int 551 vn_statfile(file_t *fp, struct stat *sb) 552 { 553 struct vnode *vp = (struct vnode *)fp->f_data; 554 555 return vn_stat(vp, sb); 556 } 557 558 int 559 vn_stat(struct vnode *vp, struct stat *sb) 560 { 561 struct vattr va; 562 int error; 563 mode_t mode; 564 565 error = VOP_GETATTR(vp, &va, kauth_cred_get()); 566 if (error) 567 return (error); 568 /* 569 * Copy from vattr table 570 */ 571 sb->st_dev = va.va_fsid; 572 sb->st_ino = va.va_fileid; 573 mode = va.va_mode; 574 switch (vp->v_type) { 575 case VREG: 576 mode |= S_IFREG; 577 break; 578 case VDIR: 579 mode |= S_IFDIR; 580 break; 581 case VBLK: 582 mode |= S_IFBLK; 583 break; 584 case VCHR: 585 mode |= S_IFCHR; 586 break; 587 case VLNK: 588 mode |= S_IFLNK; 589 break; 590 case VSOCK: 591 mode |= S_IFSOCK; 592 break; 593 case VFIFO: 594 mode |= S_IFIFO; 595 break; 596 default: 597 return (EBADF); 598 }; 599 sb->st_mode = mode; 600 sb->st_nlink = va.va_nlink; 601 sb->st_uid = va.va_uid; 602 sb->st_gid = va.va_gid; 603 sb->st_rdev = va.va_rdev; 604 sb->st_size = va.va_size; 605 sb->st_atimespec = va.va_atime; 606 sb->st_mtimespec = va.va_mtime; 607 sb->st_ctimespec = va.va_ctime; 608 sb->st_birthtimespec = va.va_birthtime; 609 sb->st_blksize = va.va_blocksize; 610 sb->st_flags = va.va_flags; 611 sb->st_gen = 0; 612 sb->st_blocks = va.va_bytes / S_BLKSIZE; 613 return (0); 614 } 615 616 /* 617 * File table vnode fcntl routine. 618 */ 619 static int 620 vn_fcntl(file_t *fp, u_int com, void *data) 621 { 622 struct vnode *vp = fp->f_data; 623 int error; 624 625 error = VOP_FCNTL(vp, com, data, fp->f_flag, kauth_cred_get()); 626 return (error); 627 } 628 629 /* 630 * File table vnode ioctl routine. 631 */ 632 static int 633 vn_ioctl(file_t *fp, u_long com, void *data) 634 { 635 struct vnode *vp = fp->f_data, *ovp; 636 struct vattr vattr; 637 int error; 638 639 switch (vp->v_type) { 640 641 case VREG: 642 case VDIR: 643 if (com == FIONREAD) { 644 error = VOP_GETATTR(vp, &vattr, 645 kauth_cred_get()); 646 if (error) 647 return (error); 648 *(int *)data = vattr.va_size - fp->f_offset; 649 return (0); 650 } 651 if ((com == FIONWRITE) || (com == FIONSPACE)) { 652 /* 653 * Files don't have send queues, so there never 654 * are any bytes in them, nor is there any 655 * open space in them. 656 */ 657 *(int *)data = 0; 658 return (0); 659 } 660 if (com == FIOGETBMAP) { 661 daddr_t *block; 662 663 if (*(daddr_t *)data < 0) 664 return (EINVAL); 665 block = (daddr_t *)data; 666 return (VOP_BMAP(vp, *block, NULL, block, NULL)); 667 } 668 if (com == OFIOGETBMAP) { 669 daddr_t ibn, obn; 670 671 if (*(int32_t *)data < 0) 672 return (EINVAL); 673 ibn = (daddr_t)*(int32_t *)data; 674 error = VOP_BMAP(vp, ibn, NULL, &obn, NULL); 675 *(int32_t *)data = (int32_t)obn; 676 return error; 677 } 678 if (com == FIONBIO || com == FIOASYNC) /* XXX */ 679 return (0); /* XXX */ 680 /* fall into ... */ 681 case VFIFO: 682 case VCHR: 683 case VBLK: 684 error = VOP_IOCTL(vp, com, data, fp->f_flag, 685 kauth_cred_get()); 686 if (error == 0 && com == TIOCSCTTY) { 687 VREF(vp); 688 mutex_enter(proc_lock); 689 ovp = curproc->p_session->s_ttyvp; 690 curproc->p_session->s_ttyvp = vp; 691 mutex_exit(proc_lock); 692 if (ovp != NULL) 693 vrele(ovp); 694 } 695 return (error); 696 697 default: 698 return (EPASSTHROUGH); 699 } 700 } 701 702 /* 703 * File table vnode poll routine. 704 */ 705 static int 706 vn_poll(file_t *fp, int events) 707 { 708 709 return (VOP_POLL(fp->f_data, events)); 710 } 711 712 /* 713 * File table vnode kqfilter routine. 714 */ 715 int 716 vn_kqfilter(file_t *fp, struct knote *kn) 717 { 718 719 return (VOP_KQFILTER(fp->f_data, kn)); 720 } 721 722 /* 723 * Check that the vnode is still valid, and if so 724 * acquire requested lock. 725 */ 726 int 727 vn_lock(struct vnode *vp, int flags) 728 { 729 int error; 730 731 #if 0 732 KASSERT(vp->v_usecount > 0 || (flags & LK_INTERLOCK) != 0 733 || (vp->v_iflag & VI_ONWORKLST) != 0); 734 #endif 735 KASSERT((flags & 736 ~(LK_INTERLOCK|LK_SHARED|LK_EXCLUSIVE|LK_NOWAIT|LK_RETRY| 737 LK_CANRECURSE)) 738 == 0); 739 740 #ifdef DIAGNOSTIC 741 if (wapbl_vphaswapbl(vp)) 742 WAPBL_JUNLOCK_ASSERT(wapbl_vptomp(vp)); 743 #endif 744 745 do { 746 /* 747 * XXX PR 37706 forced unmount of file systems is unsafe. 748 * Race between vclean() and this the remaining problem. 749 */ 750 if (vp->v_iflag & VI_XLOCK) { 751 if ((flags & LK_INTERLOCK) == 0) { 752 mutex_enter(&vp->v_interlock); 753 } 754 flags &= ~LK_INTERLOCK; 755 if (flags & LK_NOWAIT) { 756 mutex_exit(&vp->v_interlock); 757 return EBUSY; 758 } 759 vwait(vp, VI_XLOCK); 760 mutex_exit(&vp->v_interlock); 761 error = ENOENT; 762 } else { 763 if ((flags & LK_INTERLOCK) != 0) { 764 mutex_exit(&vp->v_interlock); 765 } 766 flags &= ~LK_INTERLOCK; 767 error = VOP_LOCK(vp, (flags & ~LK_RETRY)); 768 if (error == 0 || error == EDEADLK || error == EBUSY) 769 return (error); 770 } 771 } while (flags & LK_RETRY); 772 return (error); 773 } 774 775 /* 776 * File table vnode close routine. 777 */ 778 static int 779 vn_closefile(file_t *fp) 780 { 781 782 return vn_close(fp->f_data, fp->f_flag, fp->f_cred); 783 } 784 785 /* 786 * Enable LK_CANRECURSE on lock. Return prior status. 787 */ 788 u_int 789 vn_setrecurse(struct vnode *vp) 790 { 791 struct vnlock *lkp; 792 793 lkp = (vp->v_vnlock != NULL ? vp->v_vnlock : &vp->v_lock); 794 atomic_inc_uint(&lkp->vl_canrecurse); 795 796 return 0; 797 } 798 799 /* 800 * Called when done with locksetrecurse. 801 */ 802 void 803 vn_restorerecurse(struct vnode *vp, u_int flags) 804 { 805 struct vnlock *lkp; 806 807 lkp = (vp->v_vnlock != NULL ? vp->v_vnlock : &vp->v_lock); 808 atomic_dec_uint(&lkp->vl_canrecurse); 809 } 810 811 /* 812 * Simplified in-kernel wrapper calls for extended attribute access. 813 * Both calls pass in a NULL credential, authorizing a "kernel" access. 814 * Set IO_NODELOCKED in ioflg if the vnode is already locked. 815 */ 816 int 817 vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, 818 const char *attrname, size_t *buflen, void *bf, struct lwp *l) 819 { 820 struct uio auio; 821 struct iovec aiov; 822 int error; 823 824 aiov.iov_len = *buflen; 825 aiov.iov_base = bf; 826 827 auio.uio_iov = &aiov; 828 auio.uio_iovcnt = 1; 829 auio.uio_rw = UIO_READ; 830 auio.uio_offset = 0; 831 auio.uio_resid = *buflen; 832 UIO_SETUP_SYSSPACE(&auio); 833 834 if ((ioflg & IO_NODELOCKED) == 0) 835 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 836 837 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL); 838 839 if ((ioflg & IO_NODELOCKED) == 0) 840 VOP_UNLOCK(vp, 0); 841 842 if (error == 0) 843 *buflen = *buflen - auio.uio_resid; 844 845 return (error); 846 } 847 848 /* 849 * XXX Failure mode if partially written? 850 */ 851 int 852 vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, 853 const char *attrname, size_t buflen, const void *bf, struct lwp *l) 854 { 855 struct uio auio; 856 struct iovec aiov; 857 int error; 858 859 aiov.iov_len = buflen; 860 aiov.iov_base = __UNCONST(bf); /* XXXUNCONST kills const */ 861 862 auio.uio_iov = &aiov; 863 auio.uio_iovcnt = 1; 864 auio.uio_rw = UIO_WRITE; 865 auio.uio_offset = 0; 866 auio.uio_resid = buflen; 867 UIO_SETUP_SYSSPACE(&auio); 868 869 if ((ioflg & IO_NODELOCKED) == 0) { 870 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 871 } 872 873 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL); 874 875 if ((ioflg & IO_NODELOCKED) == 0) { 876 VOP_UNLOCK(vp, 0); 877 } 878 879 return (error); 880 } 881 882 int 883 vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, 884 const char *attrname, struct lwp *l) 885 { 886 int error; 887 888 if ((ioflg & IO_NODELOCKED) == 0) { 889 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 890 } 891 892 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL); 893 if (error == EOPNOTSUPP) 894 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, NULL); 895 896 if ((ioflg & IO_NODELOCKED) == 0) { 897 VOP_UNLOCK(vp, 0); 898 } 899 900 return (error); 901 } 902 903 void 904 vn_ra_allocctx(struct vnode *vp) 905 { 906 struct uvm_ractx *ra = NULL; 907 908 KASSERT(mutex_owned(&vp->v_interlock)); 909 910 if (vp->v_type != VREG) { 911 return; 912 } 913 if (vp->v_ractx != NULL) { 914 return; 915 } 916 if (vp->v_ractx == NULL) { 917 mutex_exit(&vp->v_interlock); 918 ra = uvm_ra_allocctx(); 919 mutex_enter(&vp->v_interlock); 920 if (ra != NULL && vp->v_ractx == NULL) { 921 vp->v_ractx = ra; 922 ra = NULL; 923 } 924 } 925 if (ra != NULL) { 926 uvm_ra_freectx(ra); 927 } 928 } 929
Indexes created Sat Sep 20 22:09:52 GMT 2025