vfs_vnops.c revision 1.185.2.3
1 /* $NetBSD: vfs_vnops.c,v 1.185.2.3 2014/08/20 00:04:29 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 1.185.2.3 2014/08/20 00:04:29 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 /* We have to release the locks ourselves */ 176 if (fmode & O_CREAT) { 177 if (vp == NULL) { 178 vput(ndp->ni_dvp); 179 } else { 180 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 181 if (ndp->ni_dvp == ndp->ni_vp) 182 vrele(ndp->ni_dvp); 183 else 184 vput(ndp->ni_dvp); 185 ndp->ni_dvp = NULL; 186 vput(vp); 187 } 188 } else { 189 vput(vp); 190 } 191 goto out; 192 } 193 #endif /* NVERIEXEC > 0 */ 194 195 if (fmode & O_CREAT) { 196 if (ndp->ni_vp == NULL) { 197 vattr_null(&va); 198 va.va_type = VREG; 199 va.va_mode = cmode; 200 if (fmode & O_EXCL) 201 va.va_vaflags |= VA_EXCLUSIVE; 202 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, 203 &ndp->ni_cnd, &va); 204 vput(ndp->ni_dvp); 205 if (error) 206 goto out; 207 fmode &= ~O_TRUNC; 208 vp = ndp->ni_vp; 209 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 210 } else { 211 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 212 if (ndp->ni_dvp == ndp->ni_vp) 213 vrele(ndp->ni_dvp); 214 else 215 vput(ndp->ni_dvp); 216 ndp->ni_dvp = NULL; 217 vp = ndp->ni_vp; 218 if (fmode & O_EXCL) { 219 error = EEXIST; 220 goto bad; 221 } 222 fmode &= ~O_CREAT; 223 } 224 } else { 225 vp = ndp->ni_vp; 226 } 227 if (vp->v_type == VSOCK) { 228 error = EOPNOTSUPP; 229 goto bad; 230 } 231 if (ndp->ni_vp->v_type == VLNK) { 232 error = EFTYPE; 233 goto bad; 234 } 235 236 if ((fmode & O_CREAT) == 0) { 237 error = vn_openchk(vp, cred, fmode); 238 if (error != 0) 239 goto bad; 240 } 241 242 if (fmode & O_TRUNC) { 243 vattr_null(&va); 244 va.va_size = 0; 245 error = VOP_SETATTR(vp, &va, cred); 246 if (error != 0) 247 goto bad; 248 } 249 if ((error = VOP_OPEN(vp, fmode, cred)) != 0) 250 goto bad; 251 if (fmode & FWRITE) { 252 mutex_enter(vp->v_interlock); 253 vp->v_writecount++; 254 mutex_exit(vp->v_interlock); 255 } 256 257 bad: 258 if (error) 259 vput(vp); 260 out: 261 pathbuf_stringcopy_put(ndp->ni_pathbuf, pathstring); 262 return (error); 263 } 264 265 /* 266 * Check for write permissions on the specified vnode. 267 * Prototype text segments cannot be written. 268 */ 269 int 270 vn_writechk(struct vnode *vp) 271 { 272 273 /* 274 * If the vnode is in use as a process's text, 275 * we can't allow writing. 276 */ 277 if (vp->v_iflag & VI_TEXT) 278 return (ETXTBSY); 279 return (0); 280 } 281 282 int 283 vn_openchk(struct vnode *vp, kauth_cred_t cred, int fflags) 284 { 285 int permbits = 0; 286 int error; 287 288 if ((fflags & O_DIRECTORY) != 0 && vp->v_type != VDIR) 289 return ENOTDIR; 290 291 if ((fflags & FREAD) != 0) { 292 permbits = VREAD; 293 } 294 if ((fflags & (FWRITE | O_TRUNC)) != 0) { 295 permbits |= VWRITE; 296 if (vp->v_type == VDIR) { 297 error = EISDIR; 298 goto bad; 299 } 300 error = vn_writechk(vp); 301 if (error != 0) 302 goto bad; 303 } 304 error = VOP_ACCESS(vp, permbits, cred); 305 bad: 306 return error; 307 } 308 309 /* 310 * Mark a vnode as having executable mappings. 311 */ 312 void 313 vn_markexec(struct vnode *vp) 314 { 315 316 if ((vp->v_iflag & VI_EXECMAP) != 0) { 317 /* Safe unlocked, as long as caller holds a reference. */ 318 return; 319 } 320 321 mutex_enter(vp->v_interlock); 322 if ((vp->v_iflag & VI_EXECMAP) == 0) { 323 atomic_add_int(&uvmexp.filepages, -vp->v_uobj.uo_npages); 324 atomic_add_int(&uvmexp.execpages, vp->v_uobj.uo_npages); 325 vp->v_iflag |= VI_EXECMAP; 326 } 327 mutex_exit(vp->v_interlock); 328 } 329 330 /* 331 * Mark a vnode as being the text of a process. 332 * Fail if the vnode is currently writable. 333 */ 334 int 335 vn_marktext(struct vnode *vp) 336 { 337 338 if ((vp->v_iflag & (VI_TEXT|VI_EXECMAP)) == (VI_TEXT|VI_EXECMAP)) { 339 /* Safe unlocked, as long as caller holds a reference. */ 340 return (0); 341 } 342 343 mutex_enter(vp->v_interlock); 344 if (vp->v_writecount != 0) { 345 KASSERT((vp->v_iflag & VI_TEXT) == 0); 346 mutex_exit(vp->v_interlock); 347 return (ETXTBSY); 348 } 349 if ((vp->v_iflag & VI_EXECMAP) == 0) { 350 atomic_add_int(&uvmexp.filepages, -vp->v_uobj.uo_npages); 351 atomic_add_int(&uvmexp.execpages, vp->v_uobj.uo_npages); 352 } 353 vp->v_iflag |= (VI_TEXT | VI_EXECMAP); 354 mutex_exit(vp->v_interlock); 355 return (0); 356 } 357 358 /* 359 * Vnode close call 360 * 361 * Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node. 362 */ 363 int 364 vn_close(struct vnode *vp, int flags, kauth_cred_t cred) 365 { 366 int error; 367 368 if (flags & FWRITE) { 369 mutex_enter(vp->v_interlock); 370 KASSERT(vp->v_writecount > 0); 371 vp->v_writecount--; 372 mutex_exit(vp->v_interlock); 373 } 374 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 375 error = VOP_CLOSE(vp, flags, cred); 376 vput(vp); 377 return (error); 378 } 379 380 static int 381 enforce_rlimit_fsize(struct vnode *vp, struct uio *uio, int ioflag) 382 { 383 struct lwp *l = curlwp; 384 off_t testoff; 385 386 if (uio->uio_rw != UIO_WRITE || vp->v_type != VREG) 387 return 0; 388 389 KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); 390 if (ioflag & IO_APPEND) 391 testoff = vp->v_size; 392 else 393 testoff = uio->uio_offset; 394 395 if (testoff + uio->uio_resid > 396 l->l_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 397 mutex_enter(proc_lock); 398 psignal(l->l_proc, SIGXFSZ); 399 mutex_exit(proc_lock); 400 return EFBIG; 401 } 402 403 return 0; 404 } 405 406 /* 407 * Package up an I/O request on a vnode into a uio and do it. 408 */ 409 int 410 vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset, 411 enum uio_seg segflg, int ioflg, kauth_cred_t cred, size_t *aresid, 412 struct lwp *l) 413 { 414 struct uio auio; 415 struct iovec aiov; 416 int error; 417 418 if ((ioflg & IO_NODELOCKED) == 0) { 419 if (rw == UIO_READ) { 420 vn_lock(vp, LK_SHARED | LK_RETRY); 421 } else /* UIO_WRITE */ { 422 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 423 } 424 } 425 auio.uio_iov = &aiov; 426 auio.uio_iovcnt = 1; 427 aiov.iov_base = base; 428 aiov.iov_len = len; 429 auio.uio_resid = len; 430 auio.uio_offset = offset; 431 auio.uio_rw = rw; 432 if (segflg == UIO_SYSSPACE) { 433 UIO_SETUP_SYSSPACE(&auio); 434 } else { 435 auio.uio_vmspace = l->l_proc->p_vmspace; 436 } 437 438 if ((error = enforce_rlimit_fsize(vp, &auio, ioflg)) != 0) 439 goto out; 440 441 if (rw == UIO_READ) { 442 error = VOP_READ(vp, &auio, ioflg, cred); 443 } else { 444 error = VOP_WRITE(vp, &auio, ioflg, cred); 445 } 446 447 if (aresid) 448 *aresid = auio.uio_resid; 449 else 450 if (auio.uio_resid && error == 0) 451 error = EIO; 452 453 out: 454 if ((ioflg & IO_NODELOCKED) == 0) { 455 VOP_UNLOCK(vp); 456 } 457 return (error); 458 } 459 460 int 461 vn_readdir(file_t *fp, char *bf, int segflg, u_int count, int *done, 462 struct lwp *l, off_t **cookies, int *ncookies) 463 { 464 struct vnode *vp = (struct vnode *)fp->f_data; 465 struct iovec aiov; 466 struct uio auio; 467 int error, eofflag; 468 469 /* Limit the size on any kernel buffers used by VOP_READDIR */ 470 count = min(MAXBSIZE, count); 471 472 unionread: 473 if (vp->v_type != VDIR) 474 return (EINVAL); 475 aiov.iov_base = bf; 476 aiov.iov_len = count; 477 auio.uio_iov = &aiov; 478 auio.uio_iovcnt = 1; 479 auio.uio_rw = UIO_READ; 480 if (segflg == UIO_SYSSPACE) { 481 UIO_SETUP_SYSSPACE(&auio); 482 } else { 483 KASSERT(l == curlwp); 484 auio.uio_vmspace = l->l_proc->p_vmspace; 485 } 486 auio.uio_resid = count; 487 vn_lock(vp, LK_SHARED | LK_RETRY); 488 auio.uio_offset = fp->f_offset; 489 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookies, 490 ncookies); 491 mutex_enter(&fp->f_lock); 492 fp->f_offset = auio.uio_offset; 493 mutex_exit(&fp->f_lock); 494 VOP_UNLOCK(vp); 495 if (error) 496 return (error); 497 498 if (count == auio.uio_resid && vn_union_readdir_hook) { 499 struct vnode *ovp = vp; 500 501 error = (*vn_union_readdir_hook)(&vp, fp, l); 502 if (error) 503 return (error); 504 if (vp != ovp) 505 goto unionread; 506 } 507 508 if (count == auio.uio_resid && (vp->v_vflag & VV_ROOT) && 509 (vp->v_mount->mnt_flag & MNT_UNION)) { 510 struct vnode *tvp = vp; 511 vp = vp->v_mount->mnt_vnodecovered; 512 vref(vp); 513 mutex_enter(&fp->f_lock); 514 fp->f_data = vp; 515 fp->f_offset = 0; 516 mutex_exit(&fp->f_lock); 517 vrele(tvp); 518 goto unionread; 519 } 520 *done = count - auio.uio_resid; 521 return error; 522 } 523 524 /* 525 * File table vnode read routine. 526 */ 527 static int 528 vn_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 529 int flags) 530 { 531 struct vnode *vp = (struct vnode *)fp->f_data; 532 int error, ioflag, fflag; 533 size_t count; 534 535 ioflag = IO_ADV_ENCODE(fp->f_advice); 536 fflag = fp->f_flag; 537 if (fflag & FNONBLOCK) 538 ioflag |= IO_NDELAY; 539 if ((fflag & (FFSYNC | FRSYNC)) == (FFSYNC | FRSYNC)) 540 ioflag |= IO_SYNC; 541 if (fflag & FALTIO) 542 ioflag |= IO_ALTSEMANTICS; 543 if (fflag & FDIRECT) 544 ioflag |= IO_DIRECT; 545 vn_lock(vp, LK_SHARED | LK_RETRY); 546 uio->uio_offset = *offset; 547 count = uio->uio_resid; 548 error = VOP_READ(vp, uio, ioflag, cred); 549 if (flags & FOF_UPDATE_OFFSET) 550 *offset += count - uio->uio_resid; 551 VOP_UNLOCK(vp); 552 return (error); 553 } 554 555 /* 556 * File table vnode write routine. 557 */ 558 static int 559 vn_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 560 int flags) 561 { 562 struct vnode *vp = (struct vnode *)fp->f_data; 563 int error, ioflag, fflag; 564 size_t count; 565 566 ioflag = IO_ADV_ENCODE(fp->f_advice) | IO_UNIT; 567 fflag = fp->f_flag; 568 if (vp->v_type == VREG && (fflag & O_APPEND)) 569 ioflag |= IO_APPEND; 570 if (fflag & FNONBLOCK) 571 ioflag |= IO_NDELAY; 572 if (fflag & FFSYNC || 573 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 574 ioflag |= IO_SYNC; 575 else if (fflag & FDSYNC) 576 ioflag |= IO_DSYNC; 577 if (fflag & FALTIO) 578 ioflag |= IO_ALTSEMANTICS; 579 if (fflag & FDIRECT) 580 ioflag |= IO_DIRECT; 581 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 582 uio->uio_offset = *offset; 583 count = uio->uio_resid; 584 585 if ((error = enforce_rlimit_fsize(vp, uio, ioflag)) != 0) 586 goto out; 587 588 error = VOP_WRITE(vp, uio, ioflag, cred); 589 590 if (flags & FOF_UPDATE_OFFSET) { 591 if (ioflag & IO_APPEND) { 592 /* 593 * SUSv3 describes behaviour for count = 0 as following: 594 * "Before any action ... is taken, and if nbyte is zero 595 * and the file is a regular file, the write() function 596 * ... in the absence of errors ... shall return zero 597 * and have no other results." 598 */ 599 if (count) 600 *offset = uio->uio_offset; 601 } else 602 *offset += count - uio->uio_resid; 603 } 604 605 out: 606 VOP_UNLOCK(vp); 607 return (error); 608 } 609 610 /* 611 * File table vnode stat routine. 612 */ 613 static int 614 vn_statfile(file_t *fp, struct stat *sb) 615 { 616 struct vnode *vp = fp->f_data; 617 int error; 618 619 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 620 error = vn_stat(vp, sb); 621 VOP_UNLOCK(vp); 622 return error; 623 } 624 625 int 626 vn_stat(struct vnode *vp, struct stat *sb) 627 { 628 struct vattr va; 629 int error; 630 mode_t mode; 631 632 memset(&va, 0, sizeof(va)); 633 error = VOP_GETATTR(vp, &va, kauth_cred_get()); 634 if (error) 635 return (error); 636 /* 637 * Copy from vattr table 638 */ 639 memset(sb, 0, sizeof(*sb)); 640 sb->st_dev = va.va_fsid; 641 sb->st_ino = va.va_fileid; 642 mode = va.va_mode; 643 switch (vp->v_type) { 644 case VREG: 645 mode |= S_IFREG; 646 break; 647 case VDIR: 648 mode |= S_IFDIR; 649 break; 650 case VBLK: 651 mode |= S_IFBLK; 652 break; 653 case VCHR: 654 mode |= S_IFCHR; 655 break; 656 case VLNK: 657 mode |= S_IFLNK; 658 break; 659 case VSOCK: 660 mode |= S_IFSOCK; 661 break; 662 case VFIFO: 663 mode |= S_IFIFO; 664 break; 665 default: 666 return (EBADF); 667 }; 668 sb->st_mode = mode; 669 sb->st_nlink = va.va_nlink; 670 sb->st_uid = va.va_uid; 671 sb->st_gid = va.va_gid; 672 sb->st_rdev = va.va_rdev; 673 sb->st_size = va.va_size; 674 sb->st_atimespec = va.va_atime; 675 sb->st_mtimespec = va.va_mtime; 676 sb->st_ctimespec = va.va_ctime; 677 sb->st_birthtimespec = va.va_birthtime; 678 sb->st_blksize = va.va_blocksize; 679 sb->st_flags = va.va_flags; 680 sb->st_gen = 0; 681 sb->st_blocks = va.va_bytes / S_BLKSIZE; 682 return (0); 683 } 684 685 /* 686 * File table vnode fcntl routine. 687 */ 688 static int 689 vn_fcntl(file_t *fp, u_int com, void *data) 690 { 691 struct vnode *vp = fp->f_data; 692 int error; 693 694 error = VOP_FCNTL(vp, com, data, fp->f_flag, kauth_cred_get()); 695 return (error); 696 } 697 698 /* 699 * File table vnode ioctl routine. 700 */ 701 static int 702 vn_ioctl(file_t *fp, u_long com, void *data) 703 { 704 struct vnode *vp = fp->f_data, *ovp; 705 struct vattr vattr; 706 int error; 707 708 switch (vp->v_type) { 709 710 case VREG: 711 case VDIR: 712 if (com == FIONREAD) { 713 vn_lock(vp, LK_SHARED | LK_RETRY); 714 error = VOP_GETATTR(vp, &vattr, kauth_cred_get()); 715 VOP_UNLOCK(vp); 716 if (error) 717 return (error); 718 *(int *)data = vattr.va_size - fp->f_offset; 719 return (0); 720 } 721 if ((com == FIONWRITE) || (com == FIONSPACE)) { 722 /* 723 * Files don't have send queues, so there never 724 * are any bytes in them, nor is there any 725 * open space in them. 726 */ 727 *(int *)data = 0; 728 return (0); 729 } 730 if (com == FIOGETBMAP) { 731 daddr_t *block; 732 733 if (*(daddr_t *)data < 0) 734 return (EINVAL); 735 block = (daddr_t *)data; 736 return (VOP_BMAP(vp, *block, NULL, block, NULL)); 737 } 738 if (com == OFIOGETBMAP) { 739 daddr_t ibn, obn; 740 741 if (*(int32_t *)data < 0) 742 return (EINVAL); 743 ibn = (daddr_t)*(int32_t *)data; 744 error = VOP_BMAP(vp, ibn, NULL, &obn, NULL); 745 *(int32_t *)data = (int32_t)obn; 746 return error; 747 } 748 if (com == FIONBIO || com == FIOASYNC) /* XXX */ 749 return (0); /* XXX */ 750 /* fall into ... */ 751 case VFIFO: 752 case VCHR: 753 case VBLK: 754 error = VOP_IOCTL(vp, com, data, fp->f_flag, 755 kauth_cred_get()); 756 if (error == 0 && com == TIOCSCTTY) { 757 vref(vp); 758 mutex_enter(proc_lock); 759 ovp = curproc->p_session->s_ttyvp; 760 curproc->p_session->s_ttyvp = vp; 761 mutex_exit(proc_lock); 762 if (ovp != NULL) 763 vrele(ovp); 764 } 765 return (error); 766 767 default: 768 return (EPASSTHROUGH); 769 } 770 } 771 772 /* 773 * File table vnode poll routine. 774 */ 775 static int 776 vn_poll(file_t *fp, int events) 777 { 778 779 return (VOP_POLL(fp->f_data, events)); 780 } 781 782 /* 783 * File table vnode kqfilter routine. 784 */ 785 int 786 vn_kqfilter(file_t *fp, struct knote *kn) 787 { 788 789 return (VOP_KQFILTER(fp->f_data, kn)); 790 } 791 792 /* 793 * Check that the vnode is still valid, and if so 794 * acquire requested lock. 795 */ 796 int 797 vn_lock(struct vnode *vp, int flags) 798 { 799 int error; 800 801 #if 0 802 KASSERT(vp->v_usecount > 0 || (vp->v_iflag & VI_ONWORKLST) != 0); 803 #endif 804 KASSERT((flags & ~(LK_SHARED|LK_EXCLUSIVE|LK_NOWAIT|LK_RETRY)) == 0); 805 KASSERT(!mutex_owned(vp->v_interlock)); 806 807 #ifdef DIAGNOSTIC 808 if (wapbl_vphaswapbl(vp)) 809 WAPBL_JUNLOCK_ASSERT(wapbl_vptomp(vp)); 810 #endif 811 812 error = VOP_LOCK(vp, flags); 813 if ((flags & LK_RETRY) != 0 && error == ENOENT) 814 error = VOP_LOCK(vp, flags); 815 816 KASSERT((flags & LK_RETRY) == 0 || (flags & LK_NOWAIT) != 0 || 817 error == 0); 818 819 return error; 820 } 821 822 /* 823 * File table vnode close routine. 824 */ 825 static int 826 vn_closefile(file_t *fp) 827 { 828 829 return vn_close(fp->f_data, fp->f_flag, fp->f_cred); 830 } 831 832 /* 833 * Simplified in-kernel wrapper calls for extended attribute access. 834 * Both calls pass in a NULL credential, authorizing a "kernel" access. 835 * Set IO_NODELOCKED in ioflg if the vnode is already locked. 836 */ 837 int 838 vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, 839 const char *attrname, size_t *buflen, void *bf, struct lwp *l) 840 { 841 struct uio auio; 842 struct iovec aiov; 843 int error; 844 845 aiov.iov_len = *buflen; 846 aiov.iov_base = bf; 847 848 auio.uio_iov = &aiov; 849 auio.uio_iovcnt = 1; 850 auio.uio_rw = UIO_READ; 851 auio.uio_offset = 0; 852 auio.uio_resid = *buflen; 853 UIO_SETUP_SYSSPACE(&auio); 854 855 if ((ioflg & IO_NODELOCKED) == 0) 856 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 857 858 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL); 859 860 if ((ioflg & IO_NODELOCKED) == 0) 861 VOP_UNLOCK(vp); 862 863 if (error == 0) 864 *buflen = *buflen - auio.uio_resid; 865 866 return (error); 867 } 868 869 /* 870 * XXX Failure mode if partially written? 871 */ 872 int 873 vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, 874 const char *attrname, size_t buflen, const void *bf, struct lwp *l) 875 { 876 struct uio auio; 877 struct iovec aiov; 878 int error; 879 880 aiov.iov_len = buflen; 881 aiov.iov_base = __UNCONST(bf); /* XXXUNCONST kills const */ 882 883 auio.uio_iov = &aiov; 884 auio.uio_iovcnt = 1; 885 auio.uio_rw = UIO_WRITE; 886 auio.uio_offset = 0; 887 auio.uio_resid = buflen; 888 UIO_SETUP_SYSSPACE(&auio); 889 890 if ((ioflg & IO_NODELOCKED) == 0) { 891 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 892 } 893 894 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL); 895 896 if ((ioflg & IO_NODELOCKED) == 0) { 897 VOP_UNLOCK(vp); 898 } 899 900 return (error); 901 } 902 903 int 904 vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, 905 const char *attrname, struct lwp *l) 906 { 907 int error; 908 909 if ((ioflg & IO_NODELOCKED) == 0) { 910 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 911 } 912 913 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL); 914 if (error == EOPNOTSUPP) 915 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, NULL); 916 917 if ((ioflg & IO_NODELOCKED) == 0) { 918 VOP_UNLOCK(vp); 919 } 920 921 return (error); 922 } 923 924 void 925 vn_ra_allocctx(struct vnode *vp) 926 { 927 struct uvm_ractx *ra = NULL; 928 929 KASSERT(mutex_owned(vp->v_interlock)); 930 931 if (vp->v_type != VREG) { 932 return; 933 } 934 if (vp->v_ractx != NULL) { 935 return; 936 } 937 if (vp->v_ractx == NULL) { 938 mutex_exit(vp->v_interlock); 939 ra = uvm_ra_allocctx(); 940 mutex_enter(vp->v_interlock); 941 if (ra != NULL && vp->v_ractx == NULL) { 942 size_t iochunk = 512, ioc = 512; 943 944 while(1) { 945 size_t mp_mp = MAX(vp->v_mount->mnt_maxphys, 946 MAXPHYS); /* XXX NFS */ 947 size_t ra_max = MIN(mp_mp, UVM_RA_WINSIZE_MAX); 948 if (ioc > ra_max) { 949 ra->ra_iochunk = iochunk; 950 vp->v_ractx = ra; 951 ra = NULL; 952 break; 953 } else { 954 iochunk = ioc; 955 ioc *= 2; 956 } 957 } 958 } 959 } 960 if (ra != NULL) { 961 uvm_ra_freectx(ra); 962 } 963 } 964 965 int 966 vn_fifo_bypass(void *v) 967 { 968 struct vop_generic_args *ap = v; 969 970 return VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, v); 971 } 972
Indexes created Sun Sep 21 20:09:37 GMT 2025