vfs_vnops.c revision 1.185.2.2
1 /* $NetBSD: vfs_vnops.c,v 1.185.2.2 2012/11/20 03:02:45 tls 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 1.185.2.2 2012/11/20 03:02:45 tls Exp $"); 70 71 #include "veriexec.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/kernel.h> 76 #include <sys/file.h> 77 #include <sys/stat.h> 78 #include <sys/buf.h> 79 #include <sys/proc.h> 80 #include <sys/mount.h> 81 #include <sys/namei.h> 82 #include <sys/vnode.h> 83 #include <sys/ioctl.h> 84 #include <sys/tty.h> 85 #include <sys/poll.h> 86 #include <sys/kauth.h> 87 #include <sys/syslog.h> 88 #include <sys/fstrans.h> 89 #include <sys/atomic.h> 90 #include <sys/filedesc.h> 91 #include <sys/wapbl.h> 92 93 #include <miscfs/specfs/specdev.h> 94 #include <miscfs/fifofs/fifo.h> 95 96 #include <uvm/uvm_extern.h> 97 #include <uvm/uvm_readahead.h> 98 99 #ifdef UNION 100 #include <fs/union/union.h> 101 #endif 102 103 int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct lwp *); 104 105 #include <sys/verified_exec.h> 106 107 static int vn_read(file_t *fp, off_t *offset, struct uio *uio, 108 kauth_cred_t cred, int flags); 109 static int vn_write(file_t *fp, off_t *offset, struct uio *uio, 110 kauth_cred_t cred, int flags); 111 static int vn_closefile(file_t *fp); 112 static int vn_poll(file_t *fp, int events); 113 static int vn_fcntl(file_t *fp, u_int com, void *data); 114 static int vn_statfile(file_t *fp, struct stat *sb); 115 static int vn_ioctl(file_t *fp, u_long com, void *data); 116 117 const struct fileops vnops = { 118 .fo_read = vn_read, 119 .fo_write = vn_write, 120 .fo_ioctl = vn_ioctl, 121 .fo_fcntl = vn_fcntl, 122 .fo_poll = vn_poll, 123 .fo_stat = vn_statfile, 124 .fo_close = vn_closefile, 125 .fo_kqfilter = vn_kqfilter, 126 .fo_restart = fnullop_restart, 127 }; 128 129 /* 130 * Common code for vnode open operations. 131 * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. 132 */ 133 int 134 vn_open(struct nameidata *ndp, int fmode, int cmode) 135 { 136 struct vnode *vp; 137 struct lwp *l = curlwp; 138 kauth_cred_t cred = l->l_cred; 139 struct vattr va; 140 int error; 141 const char *pathstring; 142 143 if ((fmode & (O_CREAT | O_DIRECTORY)) == (O_CREAT | O_DIRECTORY)) 144 return EINVAL; 145 146 ndp->ni_cnd.cn_flags &= TRYEMULROOT | NOCHROOT; 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 pathstring = pathbuf_stringcopy_get(ndp->ni_pathbuf); 162 if (pathstring == NULL) { 163 return ENOMEM; 164 } 165 166 error = namei(ndp); 167 if (error) 168 goto out; 169 170 vp = ndp->ni_vp; 171 172 #if NVERIEXEC > 0 173 error = veriexec_openchk(l, ndp->ni_vp, pathstring, fmode); 174 if (error) 175 goto bad; 176 #endif /* NVERIEXEC > 0 */ 177 178 if (fmode & O_CREAT) { 179 if (ndp->ni_vp == NULL) { 180 vattr_null(&va); 181 va.va_type = VREG; 182 va.va_mode = cmode; 183 if (fmode & O_EXCL) 184 va.va_vaflags |= VA_EXCLUSIVE; 185 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, 186 &ndp->ni_cnd, &va); 187 if (error) 188 goto out; 189 fmode &= ~O_TRUNC; 190 vp = ndp->ni_vp; 191 } else { 192 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 193 if (ndp->ni_dvp == ndp->ni_vp) 194 vrele(ndp->ni_dvp); 195 else 196 vput(ndp->ni_dvp); 197 ndp->ni_dvp = NULL; 198 vp = ndp->ni_vp; 199 if (fmode & O_EXCL) { 200 error = EEXIST; 201 goto bad; 202 } 203 fmode &= ~O_CREAT; 204 } 205 } else { 206 vp = ndp->ni_vp; 207 } 208 if (vp->v_type == VSOCK) { 209 error = EOPNOTSUPP; 210 goto bad; 211 } 212 if (ndp->ni_vp->v_type == VLNK) { 213 error = EFTYPE; 214 goto bad; 215 } 216 217 if ((fmode & O_CREAT) == 0) { 218 error = vn_openchk(vp, cred, fmode); 219 if (error != 0) 220 goto bad; 221 } 222 223 if (fmode & O_TRUNC) { 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 pathbuf_stringcopy_put(ndp->ni_pathbuf, pathstring); 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 & O_DIRECTORY) != 0 && vp->v_type != VDIR) 270 return ENOTDIR; 271 272 if ((fflags & FREAD) != 0) { 273 permbits = VREAD; 274 } 275 if ((fflags & (FWRITE | O_TRUNC)) != 0) { 276 permbits |= VWRITE; 277 if (vp->v_type == VDIR) { 278 error = EISDIR; 279 goto bad; 280 } 281 error = vn_writechk(vp); 282 if (error != 0) 283 goto bad; 284 } 285 error = VOP_ACCESS(vp, permbits, cred); 286 bad: 287 return error; 288 } 289 290 /* 291 * Mark a vnode as having executable mappings. 292 */ 293 void 294 vn_markexec(struct vnode *vp) 295 { 296 297 if ((vp->v_iflag & VI_EXECMAP) != 0) { 298 /* Safe unlocked, as long as caller holds a reference. */ 299 return; 300 } 301 302 mutex_enter(vp->v_interlock); 303 if ((vp->v_iflag & VI_EXECMAP) == 0) { 304 atomic_add_int(&uvmexp.filepages, -vp->v_uobj.uo_npages); 305 atomic_add_int(&uvmexp.execpages, vp->v_uobj.uo_npages); 306 vp->v_iflag |= VI_EXECMAP; 307 } 308 mutex_exit(vp->v_interlock); 309 } 310 311 /* 312 * Mark a vnode as being the text of a process. 313 * Fail if the vnode is currently writable. 314 */ 315 int 316 vn_marktext(struct vnode *vp) 317 { 318 319 if ((vp->v_iflag & (VI_TEXT|VI_EXECMAP)) == (VI_TEXT|VI_EXECMAP)) { 320 /* Safe unlocked, as long as caller holds a reference. */ 321 return (0); 322 } 323 324 mutex_enter(vp->v_interlock); 325 if (vp->v_writecount != 0) { 326 KASSERT((vp->v_iflag & VI_TEXT) == 0); 327 mutex_exit(vp->v_interlock); 328 return (ETXTBSY); 329 } 330 if ((vp->v_iflag & VI_EXECMAP) == 0) { 331 atomic_add_int(&uvmexp.filepages, -vp->v_uobj.uo_npages); 332 atomic_add_int(&uvmexp.execpages, vp->v_uobj.uo_npages); 333 } 334 vp->v_iflag |= (VI_TEXT | VI_EXECMAP); 335 mutex_exit(vp->v_interlock); 336 return (0); 337 } 338 339 /* 340 * Vnode close call 341 * 342 * Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node. 343 */ 344 int 345 vn_close(struct vnode *vp, int flags, kauth_cred_t cred) 346 { 347 int error; 348 349 if (flags & FWRITE) { 350 mutex_enter(vp->v_interlock); 351 KASSERT(vp->v_writecount > 0); 352 vp->v_writecount--; 353 mutex_exit(vp->v_interlock); 354 } 355 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 356 error = VOP_CLOSE(vp, flags, cred); 357 vput(vp); 358 return (error); 359 } 360 361 static int 362 enforce_rlimit_fsize(struct vnode *vp, struct uio *uio, int ioflag) 363 { 364 struct lwp *l = curlwp; 365 off_t testoff; 366 367 if (uio->uio_rw != UIO_WRITE || vp->v_type != VREG) 368 return 0; 369 370 KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); 371 if (ioflag & IO_APPEND) 372 testoff = vp->v_size; 373 else 374 testoff = uio->uio_offset; 375 376 if (testoff + uio->uio_resid > 377 l->l_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 378 mutex_enter(proc_lock); 379 psignal(l->l_proc, SIGXFSZ); 380 mutex_exit(proc_lock); 381 return EFBIG; 382 } 383 384 return 0; 385 } 386 387 /* 388 * Package up an I/O request on a vnode into a uio and do it. 389 */ 390 int 391 vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset, 392 enum uio_seg segflg, int ioflg, kauth_cred_t cred, size_t *aresid, 393 struct lwp *l) 394 { 395 struct uio auio; 396 struct iovec aiov; 397 int error; 398 399 if ((ioflg & IO_NODELOCKED) == 0) { 400 if (rw == UIO_READ) { 401 vn_lock(vp, LK_SHARED | LK_RETRY); 402 } else /* UIO_WRITE */ { 403 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 404 } 405 } 406 auio.uio_iov = &aiov; 407 auio.uio_iovcnt = 1; 408 aiov.iov_base = base; 409 aiov.iov_len = len; 410 auio.uio_resid = len; 411 auio.uio_offset = offset; 412 auio.uio_rw = rw; 413 if (segflg == UIO_SYSSPACE) { 414 UIO_SETUP_SYSSPACE(&auio); 415 } else { 416 auio.uio_vmspace = l->l_proc->p_vmspace; 417 } 418 419 if ((error = enforce_rlimit_fsize(vp, &auio, ioflg)) != 0) 420 goto out; 421 422 if (rw == UIO_READ) { 423 error = VOP_READ(vp, &auio, ioflg, cred); 424 } else { 425 error = VOP_WRITE(vp, &auio, ioflg, cred); 426 } 427 428 if (aresid) 429 *aresid = auio.uio_resid; 430 else 431 if (auio.uio_resid && error == 0) 432 error = EIO; 433 434 out: 435 if ((ioflg & IO_NODELOCKED) == 0) { 436 VOP_UNLOCK(vp); 437 } 438 return (error); 439 } 440 441 int 442 vn_readdir(file_t *fp, char *bf, int segflg, u_int count, int *done, 443 struct lwp *l, off_t **cookies, int *ncookies) 444 { 445 struct vnode *vp = (struct vnode *)fp->f_data; 446 struct iovec aiov; 447 struct uio auio; 448 int error, eofflag; 449 450 /* Limit the size on any kernel buffers used by VOP_READDIR */ 451 count = min(MAXBSIZE, count); 452 453 unionread: 454 if (vp->v_type != VDIR) 455 return (EINVAL); 456 aiov.iov_base = bf; 457 aiov.iov_len = count; 458 auio.uio_iov = &aiov; 459 auio.uio_iovcnt = 1; 460 auio.uio_rw = UIO_READ; 461 if (segflg == UIO_SYSSPACE) { 462 UIO_SETUP_SYSSPACE(&auio); 463 } else { 464 KASSERT(l == curlwp); 465 auio.uio_vmspace = l->l_proc->p_vmspace; 466 } 467 auio.uio_resid = count; 468 vn_lock(vp, LK_SHARED | LK_RETRY); 469 auio.uio_offset = fp->f_offset; 470 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookies, 471 ncookies); 472 mutex_enter(&fp->f_lock); 473 fp->f_offset = auio.uio_offset; 474 mutex_exit(&fp->f_lock); 475 VOP_UNLOCK(vp); 476 if (error) 477 return (error); 478 479 if (count == auio.uio_resid && vn_union_readdir_hook) { 480 struct vnode *ovp = vp; 481 482 error = (*vn_union_readdir_hook)(&vp, fp, l); 483 if (error) 484 return (error); 485 if (vp != ovp) 486 goto unionread; 487 } 488 489 if (count == auio.uio_resid && (vp->v_vflag & VV_ROOT) && 490 (vp->v_mount->mnt_flag & MNT_UNION)) { 491 struct vnode *tvp = vp; 492 vp = vp->v_mount->mnt_vnodecovered; 493 vref(vp); 494 mutex_enter(&fp->f_lock); 495 fp->f_data = vp; 496 fp->f_offset = 0; 497 mutex_exit(&fp->f_lock); 498 vrele(tvp); 499 goto unionread; 500 } 501 *done = count - auio.uio_resid; 502 return error; 503 } 504 505 /* 506 * File table vnode read routine. 507 */ 508 static int 509 vn_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 510 int flags) 511 { 512 struct vnode *vp = (struct vnode *)fp->f_data; 513 int error, ioflag, fflag; 514 size_t count; 515 516 ioflag = IO_ADV_ENCODE(fp->f_advice); 517 fflag = fp->f_flag; 518 if (fflag & FNONBLOCK) 519 ioflag |= IO_NDELAY; 520 if ((fflag & (FFSYNC | FRSYNC)) == (FFSYNC | FRSYNC)) 521 ioflag |= IO_SYNC; 522 if (fflag & FALTIO) 523 ioflag |= IO_ALTSEMANTICS; 524 if (fflag & FDIRECT) 525 ioflag |= IO_DIRECT; 526 vn_lock(vp, LK_SHARED | LK_RETRY); 527 uio->uio_offset = *offset; 528 count = uio->uio_resid; 529 error = VOP_READ(vp, uio, ioflag, cred); 530 if (flags & FOF_UPDATE_OFFSET) 531 *offset += count - uio->uio_resid; 532 VOP_UNLOCK(vp); 533 return (error); 534 } 535 536 /* 537 * File table vnode write routine. 538 */ 539 static int 540 vn_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 541 int flags) 542 { 543 struct vnode *vp = (struct vnode *)fp->f_data; 544 int error, ioflag, fflag; 545 size_t count; 546 547 ioflag = IO_ADV_ENCODE(fp->f_advice) | IO_UNIT; 548 fflag = fp->f_flag; 549 if (vp->v_type == VREG && (fflag & O_APPEND)) 550 ioflag |= IO_APPEND; 551 if (fflag & FNONBLOCK) 552 ioflag |= IO_NDELAY; 553 if (fflag & FFSYNC || 554 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 555 ioflag |= IO_SYNC; 556 else if (fflag & FDSYNC) 557 ioflag |= IO_DSYNC; 558 if (fflag & FALTIO) 559 ioflag |= IO_ALTSEMANTICS; 560 if (fflag & FDIRECT) 561 ioflag |= IO_DIRECT; 562 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 563 uio->uio_offset = *offset; 564 count = uio->uio_resid; 565 566 if ((error = enforce_rlimit_fsize(vp, uio, ioflag)) != 0) 567 goto out; 568 569 error = VOP_WRITE(vp, uio, ioflag, cred); 570 571 if (flags & FOF_UPDATE_OFFSET) { 572 if (ioflag & IO_APPEND) { 573 /* 574 * SUSv3 describes behaviour for count = 0 as following: 575 * "Before any action ... is taken, and if nbyte is zero 576 * and the file is a regular file, the write() function 577 * ... in the absence of errors ... shall return zero 578 * and have no other results." 579 */ 580 if (count) 581 *offset = uio->uio_offset; 582 } else 583 *offset += count - uio->uio_resid; 584 } 585 586 out: 587 VOP_UNLOCK(vp); 588 return (error); 589 } 590 591 /* 592 * File table vnode stat routine. 593 */ 594 static int 595 vn_statfile(file_t *fp, struct stat *sb) 596 { 597 struct vnode *vp = fp->f_data; 598 int error; 599 600 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 601 error = vn_stat(vp, sb); 602 VOP_UNLOCK(vp); 603 return error; 604 } 605 606 int 607 vn_stat(struct vnode *vp, struct stat *sb) 608 { 609 struct vattr va; 610 int error; 611 mode_t mode; 612 613 memset(&va, 0, sizeof(va)); 614 error = VOP_GETATTR(vp, &va, kauth_cred_get()); 615 if (error) 616 return (error); 617 /* 618 * Copy from vattr table 619 */ 620 memset(sb, 0, sizeof(*sb)); 621 sb->st_dev = va.va_fsid; 622 sb->st_ino = va.va_fileid; 623 mode = va.va_mode; 624 switch (vp->v_type) { 625 case VREG: 626 mode |= S_IFREG; 627 break; 628 case VDIR: 629 mode |= S_IFDIR; 630 break; 631 case VBLK: 632 mode |= S_IFBLK; 633 break; 634 case VCHR: 635 mode |= S_IFCHR; 636 break; 637 case VLNK: 638 mode |= S_IFLNK; 639 break; 640 case VSOCK: 641 mode |= S_IFSOCK; 642 break; 643 case VFIFO: 644 mode |= S_IFIFO; 645 break; 646 default: 647 return (EBADF); 648 }; 649 sb->st_mode = mode; 650 sb->st_nlink = va.va_nlink; 651 sb->st_uid = va.va_uid; 652 sb->st_gid = va.va_gid; 653 sb->st_rdev = va.va_rdev; 654 sb->st_size = va.va_size; 655 sb->st_atimespec = va.va_atime; 656 sb->st_mtimespec = va.va_mtime; 657 sb->st_ctimespec = va.va_ctime; 658 sb->st_birthtimespec = va.va_birthtime; 659 sb->st_blksize = va.va_blocksize; 660 sb->st_flags = va.va_flags; 661 sb->st_gen = 0; 662 sb->st_blocks = va.va_bytes / S_BLKSIZE; 663 return (0); 664 } 665 666 /* 667 * File table vnode fcntl routine. 668 */ 669 static int 670 vn_fcntl(file_t *fp, u_int com, void *data) 671 { 672 struct vnode *vp = fp->f_data; 673 int error; 674 675 error = VOP_FCNTL(vp, com, data, fp->f_flag, kauth_cred_get()); 676 return (error); 677 } 678 679 /* 680 * File table vnode ioctl routine. 681 */ 682 static int 683 vn_ioctl(file_t *fp, u_long com, void *data) 684 { 685 struct vnode *vp = fp->f_data, *ovp; 686 struct vattr vattr; 687 int error; 688 689 switch (vp->v_type) { 690 691 case VREG: 692 case VDIR: 693 if (com == FIONREAD) { 694 vn_lock(vp, LK_SHARED | LK_RETRY); 695 error = VOP_GETATTR(vp, &vattr, kauth_cred_get()); 696 VOP_UNLOCK(vp); 697 if (error) 698 return (error); 699 *(int *)data = vattr.va_size - fp->f_offset; 700 return (0); 701 } 702 if ((com == FIONWRITE) || (com == FIONSPACE)) { 703 /* 704 * Files don't have send queues, so there never 705 * are any bytes in them, nor is there any 706 * open space in them. 707 */ 708 *(int *)data = 0; 709 return (0); 710 } 711 if (com == FIOGETBMAP) { 712 daddr_t *block; 713 714 if (*(daddr_t *)data < 0) 715 return (EINVAL); 716 block = (daddr_t *)data; 717 return (VOP_BMAP(vp, *block, NULL, block, NULL)); 718 } 719 if (com == OFIOGETBMAP) { 720 daddr_t ibn, obn; 721 722 if (*(int32_t *)data < 0) 723 return (EINVAL); 724 ibn = (daddr_t)*(int32_t *)data; 725 error = VOP_BMAP(vp, ibn, NULL, &obn, NULL); 726 *(int32_t *)data = (int32_t)obn; 727 return error; 728 } 729 if (com == FIONBIO || com == FIOASYNC) /* XXX */ 730 return (0); /* XXX */ 731 /* fall into ... */ 732 case VFIFO: 733 case VCHR: 734 case VBLK: 735 error = VOP_IOCTL(vp, com, data, fp->f_flag, 736 kauth_cred_get()); 737 if (error == 0 && com == TIOCSCTTY) { 738 vref(vp); 739 mutex_enter(proc_lock); 740 ovp = curproc->p_session->s_ttyvp; 741 curproc->p_session->s_ttyvp = vp; 742 mutex_exit(proc_lock); 743 if (ovp != NULL) 744 vrele(ovp); 745 } 746 return (error); 747 748 default: 749 return (EPASSTHROUGH); 750 } 751 } 752 753 /* 754 * File table vnode poll routine. 755 */ 756 static int 757 vn_poll(file_t *fp, int events) 758 { 759 760 return (VOP_POLL(fp->f_data, events)); 761 } 762 763 /* 764 * File table vnode kqfilter routine. 765 */ 766 int 767 vn_kqfilter(file_t *fp, struct knote *kn) 768 { 769 770 return (VOP_KQFILTER(fp->f_data, kn)); 771 } 772 773 /* 774 * Check that the vnode is still valid, and if so 775 * acquire requested lock. 776 */ 777 int 778 vn_lock(struct vnode *vp, int flags) 779 { 780 int error; 781 782 #if 0 783 KASSERT(vp->v_usecount > 0 || (vp->v_iflag & VI_ONWORKLST) != 0); 784 #endif 785 KASSERT((flags & ~(LK_SHARED|LK_EXCLUSIVE|LK_NOWAIT|LK_RETRY)) == 0); 786 KASSERT(!mutex_owned(vp->v_interlock)); 787 788 #ifdef DIAGNOSTIC 789 if (wapbl_vphaswapbl(vp)) 790 WAPBL_JUNLOCK_ASSERT(wapbl_vptomp(vp)); 791 #endif 792 793 do { 794 /* 795 * XXX PR 37706 forced unmount of file systems is unsafe. 796 * Race between vclean() and this the remaining problem. 797 */ 798 mutex_enter(vp->v_interlock); 799 if (vp->v_iflag & VI_XLOCK) { 800 if (flags & LK_NOWAIT) { 801 mutex_exit(vp->v_interlock); 802 return EBUSY; 803 } 804 vwait(vp, VI_XLOCK); 805 mutex_exit(vp->v_interlock); 806 error = ENOENT; 807 } else { 808 mutex_exit(vp->v_interlock); 809 error = VOP_LOCK(vp, (flags & ~LK_RETRY)); 810 if (error == 0 || error == EDEADLK || error == EBUSY) 811 return (error); 812 } 813 } while (flags & LK_RETRY); 814 return (error); 815 } 816 817 /* 818 * File table vnode close routine. 819 */ 820 static int 821 vn_closefile(file_t *fp) 822 { 823 824 return vn_close(fp->f_data, fp->f_flag, fp->f_cred); 825 } 826 827 /* 828 * Simplified in-kernel wrapper calls for extended attribute access. 829 * Both calls pass in a NULL credential, authorizing a "kernel" access. 830 * Set IO_NODELOCKED in ioflg if the vnode is already locked. 831 */ 832 int 833 vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, 834 const char *attrname, size_t *buflen, void *bf, struct lwp *l) 835 { 836 struct uio auio; 837 struct iovec aiov; 838 int error; 839 840 aiov.iov_len = *buflen; 841 aiov.iov_base = bf; 842 843 auio.uio_iov = &aiov; 844 auio.uio_iovcnt = 1; 845 auio.uio_rw = UIO_READ; 846 auio.uio_offset = 0; 847 auio.uio_resid = *buflen; 848 UIO_SETUP_SYSSPACE(&auio); 849 850 if ((ioflg & IO_NODELOCKED) == 0) 851 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 852 853 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL); 854 855 if ((ioflg & IO_NODELOCKED) == 0) 856 VOP_UNLOCK(vp); 857 858 if (error == 0) 859 *buflen = *buflen - auio.uio_resid; 860 861 return (error); 862 } 863 864 /* 865 * XXX Failure mode if partially written? 866 */ 867 int 868 vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, 869 const char *attrname, size_t buflen, const void *bf, struct lwp *l) 870 { 871 struct uio auio; 872 struct iovec aiov; 873 int error; 874 875 aiov.iov_len = buflen; 876 aiov.iov_base = __UNCONST(bf); /* XXXUNCONST kills const */ 877 878 auio.uio_iov = &aiov; 879 auio.uio_iovcnt = 1; 880 auio.uio_rw = UIO_WRITE; 881 auio.uio_offset = 0; 882 auio.uio_resid = buflen; 883 UIO_SETUP_SYSSPACE(&auio); 884 885 if ((ioflg & IO_NODELOCKED) == 0) { 886 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 887 } 888 889 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL); 890 891 if ((ioflg & IO_NODELOCKED) == 0) { 892 VOP_UNLOCK(vp); 893 } 894 895 return (error); 896 } 897 898 int 899 vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, 900 const char *attrname, struct lwp *l) 901 { 902 int error; 903 904 if ((ioflg & IO_NODELOCKED) == 0) { 905 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 906 } 907 908 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL); 909 if (error == EOPNOTSUPP) 910 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, NULL); 911 912 if ((ioflg & IO_NODELOCKED) == 0) { 913 VOP_UNLOCK(vp); 914 } 915 916 return (error); 917 } 918 919 void 920 vn_ra_allocctx(struct vnode *vp) 921 { 922 struct uvm_ractx *ra = NULL; 923 924 KASSERT(mutex_owned(vp->v_interlock)); 925 926 if (vp->v_type != VREG) { 927 return; 928 } 929 if (vp->v_ractx != NULL) { 930 return; 931 } 932 if (vp->v_ractx == NULL) { 933 mutex_exit(vp->v_interlock); 934 ra = uvm_ra_allocctx(); 935 mutex_enter(vp->v_interlock); 936 if (ra != NULL && vp->v_ractx == NULL) { 937 size_t iochunk = 512, ioc = 512; 938 939 while(1) { 940 size_t mp_mp = MAX(vp->v_mount->mnt_maxphys, 941 MAXPHYS); /* XXX NFS */ 942 size_t ra_max = MIN(mp_mp, UVM_RA_WINSIZE_MAX); 943 if (ioc > ra_max) { 944 ra->ra_iochunk = iochunk; 945 vp->v_ractx = ra; 946 ra = NULL; 947 break; 948 } else { 949 iochunk = ioc; 950 ioc *= 2; 951 } 952 } 953 } 954 } 955 if (ra != NULL) { 956 uvm_ra_freectx(ra); 957 } 958 } 959 960 int 961 vn_fifo_bypass(void *v) 962 { 963 struct vop_generic_args *ap = v; 964 965 return VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, v); 966 } 967
Indexes created Sat Sep 20 22:09:52 GMT 2025