1 /*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 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 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)vfs_vnops.c 8.2 (Berkeley) 1/21/94 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/fcntl.h> 43 #include <sys/file.h> 44 #include <sys/kdb.h> 45 #include <sys/stat.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/limits.h> 49 #include <sys/lock.h> 50 #include <sys/mount.h> 51 #include <sys/mutex.h> 52 #include <sys/namei.h> 53 #include <sys/vnode.h> 54 #include <sys/bio.h> 55 #include <sys/buf.h> 56 #include <sys/filio.h> 57 #include <sys/resourcevar.h> 58 #include <sys/sx.h> 59 #include <sys/ttycom.h> 60 #include <sys/conf.h> 61 #include <sys/syslog.h> 62 #include <sys/unistd.h> 63 64 #include <security/audit/audit.h> 65 #include <security/mac/mac_framework.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_object.h> 69 70 static fo_rdwr_t vn_read; 71 static fo_rdwr_t vn_write; 72 static fo_truncate_t vn_truncate; 73 static fo_ioctl_t vn_ioctl; 74 static fo_poll_t vn_poll; 75 static fo_kqfilter_t vn_kqfilter; 76 static fo_stat_t vn_statfile; 77 static fo_close_t vn_closefile; 78 79 struct fileops vnops = { 80 .fo_read = vn_read, 81 .fo_write = vn_write, 82 .fo_truncate = vn_truncate, 83 .fo_ioctl = vn_ioctl, 84 .fo_poll = vn_poll, 85 .fo_kqfilter = vn_kqfilter, 86 .fo_stat = vn_statfile, 87 .fo_close = vn_closefile, 88 .fo_chmod = vn_chmod, 89 .fo_chown = vn_chown, 90 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 91 }; 92 93 int 94 vn_open(ndp, flagp, cmode, fp) 95 struct nameidata *ndp; 96 int *flagp, cmode; 97 struct file *fp; 98 { 99 struct thread *td = ndp->ni_cnd.cn_thread; 100 101 return (vn_open_cred(ndp, flagp, cmode, 0, td->td_ucred, fp)); 102 } 103 104 /* 105 * Common code for vnode open operations. 106 * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. 107 * 108 * Note that this does NOT free nameidata for the successful case, 109 * due to the NDINIT being done elsewhere. 110 */ 111 int 112 vn_open_cred(struct nameidata *ndp, int *flagp, int cmode, u_int vn_open_flags, 113 struct ucred *cred, struct file *fp) 114 { 115 struct vnode *vp; 116 struct mount *mp; 117 struct thread *td = ndp->ni_cnd.cn_thread; 118 struct vattr vat; 119 struct vattr *vap = &vat; 120 int fmode, error; 121 accmode_t accmode; 122 int vfslocked, mpsafe; 123 124 mpsafe = ndp->ni_cnd.cn_flags & MPSAFE; 125 restart: 126 vfslocked = 0; 127 fmode = *flagp; 128 if (fmode & O_CREAT) { 129 ndp->ni_cnd.cn_nameiop = CREATE; 130 ndp->ni_cnd.cn_flags = ISOPEN | LOCKPARENT | LOCKLEAF | 131 MPSAFE; 132 if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0) 133 ndp->ni_cnd.cn_flags |= FOLLOW; 134 if (!(vn_open_flags & VN_OPEN_NOAUDIT)) 135 ndp->ni_cnd.cn_flags |= AUDITVNODE1; 136 bwillwrite(); 137 if ((error = namei(ndp)) != 0) 138 return (error); 139 vfslocked = NDHASGIANT(ndp); 140 if (!mpsafe) 141 ndp->ni_cnd.cn_flags &= ~MPSAFE; 142 if (ndp->ni_vp == NULL) { 143 VATTR_NULL(vap); 144 vap->va_type = VREG; 145 vap->va_mode = cmode; 146 if (fmode & O_EXCL) 147 vap->va_vaflags |= VA_EXCLUSIVE; 148 if (vn_start_write(ndp->ni_dvp, &mp, V_NOWAIT) != 0) { 149 NDFREE(ndp, NDF_ONLY_PNBUF); 150 vput(ndp->ni_dvp); 151 VFS_UNLOCK_GIANT(vfslocked); 152 if ((error = vn_start_write(NULL, &mp, 153 V_XSLEEP | PCATCH)) != 0) 154 return (error); 155 goto restart; 156 } 157 #ifdef MAC 158 error = mac_vnode_check_create(cred, ndp->ni_dvp, 159 &ndp->ni_cnd, vap); 160 if (error == 0) 161 #endif 162 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, 163 &ndp->ni_cnd, vap); 164 vput(ndp->ni_dvp); 165 vn_finished_write(mp); 166 if (error) { 167 VFS_UNLOCK_GIANT(vfslocked); 168 NDFREE(ndp, NDF_ONLY_PNBUF); 169 return (error); 170 } 171 fmode &= ~O_TRUNC; 172 vp = ndp->ni_vp; 173 } else { 174 if (ndp->ni_dvp == ndp->ni_vp) 175 vrele(ndp->ni_dvp); 176 else 177 vput(ndp->ni_dvp); 178 ndp->ni_dvp = NULL; 179 vp = ndp->ni_vp; 180 if (fmode & O_EXCL) { 181 error = EEXIST; 182 goto bad; 183 } 184 fmode &= ~O_CREAT; 185 } 186 } else { 187 ndp->ni_cnd.cn_nameiop = LOOKUP; 188 ndp->ni_cnd.cn_flags = ISOPEN | 189 ((fmode & O_NOFOLLOW) ? NOFOLLOW : FOLLOW) | 190 LOCKLEAF | MPSAFE; 191 if (!(fmode & FWRITE)) 192 ndp->ni_cnd.cn_flags |= LOCKSHARED; 193 if (!(vn_open_flags & VN_OPEN_NOAUDIT)) 194 ndp->ni_cnd.cn_flags |= AUDITVNODE1; 195 if ((error = namei(ndp)) != 0) 196 return (error); 197 if (!mpsafe) 198 ndp->ni_cnd.cn_flags &= ~MPSAFE; 199 vfslocked = NDHASGIANT(ndp); 200 vp = ndp->ni_vp; 201 } 202 if (vp->v_type == VLNK) { 203 error = EMLINK; 204 goto bad; 205 } 206 if (vp->v_type == VSOCK) { 207 error = EOPNOTSUPP; 208 goto bad; 209 } 210 if (vp->v_type != VDIR && fmode & O_DIRECTORY) { 211 error = ENOTDIR; 212 goto bad; 213 } 214 accmode = 0; 215 if (fmode & (FWRITE | O_TRUNC)) { 216 if (vp->v_type == VDIR) { 217 error = EISDIR; 218 goto bad; 219 } 220 accmode |= VWRITE; 221 } 222 if (fmode & FREAD) 223 accmode |= VREAD; 224 if (fmode & FEXEC) 225 accmode |= VEXEC; 226 if ((fmode & O_APPEND) && (fmode & FWRITE)) 227 accmode |= VAPPEND; 228 #ifdef MAC 229 error = mac_vnode_check_open(cred, vp, accmode); 230 if (error) 231 goto bad; 232 #endif 233 if ((fmode & O_CREAT) == 0) { 234 if (accmode & VWRITE) { 235 error = vn_writechk(vp); 236 if (error) 237 goto bad; 238 } 239 if (accmode) { 240 error = VOP_ACCESS(vp, accmode, cred, td); 241 if (error) 242 goto bad; 243 } 244 } 245 if ((error = VOP_OPEN(vp, fmode, cred, td, fp)) != 0) 246 goto bad; 247 248 if (fmode & FWRITE) 249 vp->v_writecount++; 250 *flagp = fmode; 251 ASSERT_VOP_LOCKED(vp, "vn_open_cred"); 252 if (!mpsafe) 253 VFS_UNLOCK_GIANT(vfslocked); 254 return (0); 255 bad: 256 NDFREE(ndp, NDF_ONLY_PNBUF); 257 vput(vp); 258 VFS_UNLOCK_GIANT(vfslocked); 259 *flagp = fmode; 260 ndp->ni_vp = NULL; 261 return (error); 262 } 263 264 /* 265 * Check for write permissions on the specified vnode. 266 * Prototype text segments cannot be written. 267 */ 268 int 269 vn_writechk(vp) 270 register struct vnode *vp; 271 { 272 273 ASSERT_VOP_LOCKED(vp, "vn_writechk"); 274 /* 275 * If there's shared text associated with 276 * the vnode, try to free it up once. If 277 * we fail, we can't allow writing. 278 */ 279 if (vp->v_vflag & VV_TEXT) 280 return (ETXTBSY); 281 282 return (0); 283 } 284 285 /* 286 * Vnode close call 287 */ 288 int 289 vn_close(vp, flags, file_cred, td) 290 register struct vnode *vp; 291 int flags; 292 struct ucred *file_cred; 293 struct thread *td; 294 { 295 struct mount *mp; 296 int error, lock_flags; 297 298 if (!(flags & FWRITE) && vp->v_mount != NULL && 299 vp->v_mount->mnt_kern_flag & MNTK_EXTENDED_SHARED) 300 lock_flags = LK_SHARED; 301 else 302 lock_flags = LK_EXCLUSIVE; 303 304 VFS_ASSERT_GIANT(vp->v_mount); 305 306 vn_start_write(vp, &mp, V_WAIT); 307 vn_lock(vp, lock_flags | LK_RETRY); 308 if (flags & FWRITE) { 309 VNASSERT(vp->v_writecount > 0, vp, 310 ("vn_close: negative writecount")); 311 vp->v_writecount--; 312 } 313 error = VOP_CLOSE(vp, flags, file_cred, td); 314 vput(vp); 315 vn_finished_write(mp); 316 return (error); 317 } 318 319 /* 320 * Heuristic to detect sequential operation. 321 */ 322 static int 323 sequential_heuristic(struct uio *uio, struct file *fp) 324 { 325 326 if (atomic_load_acq_int(&(fp->f_flag)) & FRDAHEAD) 327 return (fp->f_seqcount << IO_SEQSHIFT); 328 329 /* 330 * Offset 0 is handled specially. open() sets f_seqcount to 1 so 331 * that the first I/O is normally considered to be slightly 332 * sequential. Seeking to offset 0 doesn't change sequentiality 333 * unless previous seeks have reduced f_seqcount to 0, in which 334 * case offset 0 is not special. 335 */ 336 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) || 337 uio->uio_offset == fp->f_nextoff) { 338 /* 339 * f_seqcount is in units of fixed-size blocks so that it 340 * depends mainly on the amount of sequential I/O and not 341 * much on the number of sequential I/O's. The fixed size 342 * of 16384 is hard-coded here since it is (not quite) just 343 * a magic size that works well here. This size is more 344 * closely related to the best I/O size for real disks than 345 * to any block size used by software. 346 */ 347 fp->f_seqcount += howmany(uio->uio_resid, 16384); 348 if (fp->f_seqcount > IO_SEQMAX) 349 fp->f_seqcount = IO_SEQMAX; 350 return (fp->f_seqcount << IO_SEQSHIFT); 351 } 352 353 /* Not sequential. Quickly draw-down sequentiality. */ 354 if (fp->f_seqcount > 1) 355 fp->f_seqcount = 1; 356 else 357 fp->f_seqcount = 0; 358 return (0); 359 } 360 361 /* 362 * Package up an I/O request on a vnode into a uio and do it. 363 */ 364 int 365 vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, active_cred, file_cred, 366 aresid, td) 367 enum uio_rw rw; 368 struct vnode *vp; 369 void *base; 370 int len; 371 off_t offset; 372 enum uio_seg segflg; 373 int ioflg; 374 struct ucred *active_cred; 375 struct ucred *file_cred; 376 int *aresid; 377 struct thread *td; 378 { 379 struct uio auio; 380 struct iovec aiov; 381 struct mount *mp; 382 struct ucred *cred; 383 int error, lock_flags; 384 385 VFS_ASSERT_GIANT(vp->v_mount); 386 387 if ((ioflg & IO_NODELOCKED) == 0) { 388 mp = NULL; 389 if (rw == UIO_WRITE) { 390 if (vp->v_type != VCHR && 391 (error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) 392 != 0) 393 return (error); 394 if (MNT_SHARED_WRITES(mp) || 395 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 396 lock_flags = LK_SHARED; 397 } else { 398 lock_flags = LK_EXCLUSIVE; 399 } 400 vn_lock(vp, lock_flags | LK_RETRY); 401 } else 402 vn_lock(vp, LK_SHARED | LK_RETRY); 403 404 } 405 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held"); 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_segflg = segflg; 413 auio.uio_rw = rw; 414 auio.uio_td = td; 415 error = 0; 416 #ifdef MAC 417 if ((ioflg & IO_NOMACCHECK) == 0) { 418 if (rw == UIO_READ) 419 error = mac_vnode_check_read(active_cred, file_cred, 420 vp); 421 else 422 error = mac_vnode_check_write(active_cred, file_cred, 423 vp); 424 } 425 #endif 426 if (error == 0) { 427 if (file_cred) 428 cred = file_cred; 429 else 430 cred = active_cred; 431 if (rw == UIO_READ) 432 error = VOP_READ(vp, &auio, ioflg, cred); 433 else 434 error = VOP_WRITE(vp, &auio, ioflg, cred); 435 } 436 if (aresid) 437 *aresid = auio.uio_resid; 438 else 439 if (auio.uio_resid && error == 0) 440 error = EIO; 441 if ((ioflg & IO_NODELOCKED) == 0) { 442 if (rw == UIO_WRITE && vp->v_type != VCHR) 443 vn_finished_write(mp); 444 VOP_UNLOCK(vp, 0); 445 } 446 return (error); 447 } 448 449 /* 450 * Package up an I/O request on a vnode into a uio and do it. The I/O 451 * request is split up into smaller chunks and we try to avoid saturating 452 * the buffer cache while potentially holding a vnode locked, so we 453 * check bwillwrite() before calling vn_rdwr(). We also call kern_yield() 454 * to give other processes a chance to lock the vnode (either other processes 455 * core'ing the same binary, or unrelated processes scanning the directory). 456 */ 457 int 458 vn_rdwr_inchunks(rw, vp, base, len, offset, segflg, ioflg, active_cred, 459 file_cred, aresid, td) 460 enum uio_rw rw; 461 struct vnode *vp; 462 void *base; 463 size_t len; 464 off_t offset; 465 enum uio_seg segflg; 466 int ioflg; 467 struct ucred *active_cred; 468 struct ucred *file_cred; 469 size_t *aresid; 470 struct thread *td; 471 { 472 int error = 0; 473 int iaresid; 474 475 VFS_ASSERT_GIANT(vp->v_mount); 476 477 do { 478 int chunk; 479 480 /* 481 * Force `offset' to a multiple of MAXBSIZE except possibly 482 * for the first chunk, so that filesystems only need to 483 * write full blocks except possibly for the first and last 484 * chunks. 485 */ 486 chunk = MAXBSIZE - (uoff_t)offset % MAXBSIZE; 487 488 if (chunk > len) 489 chunk = len; 490 if (rw != UIO_READ && vp->v_type == VREG) 491 bwillwrite(); 492 iaresid = 0; 493 error = vn_rdwr(rw, vp, base, chunk, offset, segflg, 494 ioflg, active_cred, file_cred, &iaresid, td); 495 len -= chunk; /* aresid calc already includes length */ 496 if (error) 497 break; 498 offset += chunk; 499 base = (char *)base + chunk; 500 kern_yield(PRI_USER); 501 } while (len); 502 if (aresid) 503 *aresid = len + iaresid; 504 return (error); 505 } 506 507 /* 508 * File table vnode read routine. 509 */ 510 static int 511 vn_read(fp, uio, active_cred, flags, td) 512 struct file *fp; 513 struct uio *uio; 514 struct ucred *active_cred; 515 int flags; 516 struct thread *td; 517 { 518 struct vnode *vp; 519 int error, ioflag; 520 struct mtx *mtxp; 521 int advice, vfslocked; 522 off_t offset; 523 524 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", 525 uio->uio_td, td)); 526 mtxp = NULL; 527 vp = fp->f_vnode; 528 ioflag = 0; 529 if (fp->f_flag & FNONBLOCK) 530 ioflag |= IO_NDELAY; 531 if (fp->f_flag & O_DIRECT) 532 ioflag |= IO_DIRECT; 533 advice = POSIX_FADV_NORMAL; 534 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 535 /* 536 * According to McKusick the vn lock was protecting f_offset here. 537 * It is now protected by the FOFFSET_LOCKED flag. 538 */ 539 if ((flags & FOF_OFFSET) == 0 || fp->f_advice != NULL) { 540 mtxp = mtx_pool_find(mtxpool_sleep, fp); 541 mtx_lock(mtxp); 542 if ((flags & FOF_OFFSET) == 0) { 543 while (fp->f_vnread_flags & FOFFSET_LOCKED) { 544 fp->f_vnread_flags |= FOFFSET_LOCK_WAITING; 545 msleep(&fp->f_vnread_flags, mtxp, PUSER -1, 546 "vnread offlock", 0); 547 } 548 fp->f_vnread_flags |= FOFFSET_LOCKED; 549 uio->uio_offset = fp->f_offset; 550 } 551 if (fp->f_advice != NULL && 552 uio->uio_offset >= fp->f_advice->fa_start && 553 uio->uio_offset + uio->uio_resid <= fp->f_advice->fa_end) 554 advice = fp->f_advice->fa_advice; 555 mtx_unlock(mtxp); 556 } 557 vn_lock(vp, LK_SHARED | LK_RETRY); 558 559 switch (advice) { 560 case POSIX_FADV_NORMAL: 561 case POSIX_FADV_SEQUENTIAL: 562 case POSIX_FADV_NOREUSE: 563 ioflag |= sequential_heuristic(uio, fp); 564 break; 565 case POSIX_FADV_RANDOM: 566 /* Disable read-ahead for random I/O. */ 567 break; 568 } 569 offset = uio->uio_offset; 570 571 #ifdef MAC 572 error = mac_vnode_check_read(active_cred, fp->f_cred, vp); 573 if (error == 0) 574 #endif 575 error = VOP_READ(vp, uio, ioflag, fp->f_cred); 576 if ((flags & FOF_OFFSET) == 0) { 577 fp->f_offset = uio->uio_offset; 578 mtx_lock(mtxp); 579 if (fp->f_vnread_flags & FOFFSET_LOCK_WAITING) 580 wakeup(&fp->f_vnread_flags); 581 fp->f_vnread_flags = 0; 582 mtx_unlock(mtxp); 583 } 584 fp->f_nextoff = uio->uio_offset; 585 VOP_UNLOCK(vp, 0); 586 if (error == 0 && advice == POSIX_FADV_NOREUSE && 587 offset != uio->uio_offset) 588 error = VOP_ADVISE(vp, offset, uio->uio_offset - 1, 589 POSIX_FADV_DONTNEED); 590 VFS_UNLOCK_GIANT(vfslocked); 591 return (error); 592 } 593 594 /* 595 * File table vnode write routine. 596 */ 597 static int 598 vn_write(fp, uio, active_cred, flags, td) 599 struct file *fp; 600 struct uio *uio; 601 struct ucred *active_cred; 602 int flags; 603 struct thread *td; 604 { 605 struct vnode *vp; 606 struct mount *mp; 607 int error, ioflag, lock_flags; 608 struct mtx *mtxp; 609 int advice, vfslocked; 610 611 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", 612 uio->uio_td, td)); 613 vp = fp->f_vnode; 614 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 615 if (vp->v_type == VREG) 616 bwillwrite(); 617 ioflag = IO_UNIT; 618 if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) 619 ioflag |= IO_APPEND; 620 if (fp->f_flag & FNONBLOCK) 621 ioflag |= IO_NDELAY; 622 if (fp->f_flag & O_DIRECT) 623 ioflag |= IO_DIRECT; 624 if ((fp->f_flag & O_FSYNC) || 625 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 626 ioflag |= IO_SYNC; 627 mp = NULL; 628 if (vp->v_type != VCHR && 629 (error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 630 goto unlock; 631 632 if ((MNT_SHARED_WRITES(mp) || 633 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) && 634 (flags & FOF_OFFSET) != 0) { 635 lock_flags = LK_SHARED; 636 } else { 637 lock_flags = LK_EXCLUSIVE; 638 } 639 640 vn_lock(vp, lock_flags | LK_RETRY); 641 if ((flags & FOF_OFFSET) == 0) 642 uio->uio_offset = fp->f_offset; 643 advice = POSIX_FADV_NORMAL; 644 if (fp->f_advice != NULL) { 645 mtxp = mtx_pool_find(mtxpool_sleep, fp); 646 mtx_lock(mtxp); 647 if (fp->f_advice != NULL && 648 uio->uio_offset >= fp->f_advice->fa_start && 649 uio->uio_offset + uio->uio_resid <= fp->f_advice->fa_end) 650 advice = fp->f_advice->fa_advice; 651 mtx_unlock(mtxp); 652 } 653 switch (advice) { 654 case POSIX_FADV_NORMAL: 655 case POSIX_FADV_SEQUENTIAL: 656 ioflag |= sequential_heuristic(uio, fp); 657 break; 658 case POSIX_FADV_RANDOM: 659 /* XXX: Is this correct? */ 660 break; 661 case POSIX_FADV_NOREUSE: 662 /* 663 * Request the underlying FS to discard the buffers 664 * and pages after the I/O is complete. 665 */ 666 ioflag |= IO_DIRECT; 667 break; 668 } 669 670 #ifdef MAC 671 error = mac_vnode_check_write(active_cred, fp->f_cred, vp); 672 if (error == 0) 673 #endif 674 error = VOP_WRITE(vp, uio, ioflag, fp->f_cred); 675 if ((flags & FOF_OFFSET) == 0) 676 fp->f_offset = uio->uio_offset; 677 fp->f_nextoff = uio->uio_offset; 678 VOP_UNLOCK(vp, 0); 679 if (vp->v_type != VCHR) 680 vn_finished_write(mp); 681 unlock: 682 VFS_UNLOCK_GIANT(vfslocked); 683 return (error); 684 } 685 686 /* 687 * File table truncate routine. 688 */ 689 static int 690 vn_truncate(fp, length, active_cred, td) 691 struct file *fp; 692 off_t length; 693 struct ucred *active_cred; 694 struct thread *td; 695 { 696 struct vattr vattr; 697 struct mount *mp; 698 struct vnode *vp; 699 int vfslocked; 700 int error; 701 702 vp = fp->f_vnode; 703 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 704 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 705 if (error) { 706 VFS_UNLOCK_GIANT(vfslocked); 707 return (error); 708 } 709 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 710 if (vp->v_type == VDIR) { 711 error = EISDIR; 712 goto out; 713 } 714 #ifdef MAC 715 error = mac_vnode_check_write(active_cred, fp->f_cred, vp); 716 if (error) 717 goto out; 718 #endif 719 error = vn_writechk(vp); 720 if (error == 0) { 721 VATTR_NULL(&vattr); 722 vattr.va_size = length; 723 error = VOP_SETATTR(vp, &vattr, fp->f_cred); 724 } 725 out: 726 VOP_UNLOCK(vp, 0); 727 vn_finished_write(mp); 728 VFS_UNLOCK_GIANT(vfslocked); 729 return (error); 730 } 731 732 /* 733 * File table vnode stat routine. 734 */ 735 static int 736 vn_statfile(fp, sb, active_cred, td) 737 struct file *fp; 738 struct stat *sb; 739 struct ucred *active_cred; 740 struct thread *td; 741 { 742 struct vnode *vp = fp->f_vnode; 743 int vfslocked; 744 int error; 745 746 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 747 vn_lock(vp, LK_SHARED | LK_RETRY); 748 error = vn_stat(vp, sb, active_cred, fp->f_cred, td); 749 VOP_UNLOCK(vp, 0); 750 VFS_UNLOCK_GIANT(vfslocked); 751 752 return (error); 753 } 754 755 /* 756 * Stat a vnode; implementation for the stat syscall 757 */ 758 int 759 vn_stat(vp, sb, active_cred, file_cred, td) 760 struct vnode *vp; 761 register struct stat *sb; 762 struct ucred *active_cred; 763 struct ucred *file_cred; 764 struct thread *td; 765 { 766 struct vattr vattr; 767 register struct vattr *vap; 768 int error; 769 u_short mode; 770 771 #ifdef MAC 772 error = mac_vnode_check_stat(active_cred, file_cred, vp); 773 if (error) 774 return (error); 775 #endif 776 777 vap = &vattr; 778 779 /* 780 * Initialize defaults for new and unusual fields, so that file 781 * systems which don't support these fields don't need to know 782 * about them. 783 */ 784 vap->va_birthtime.tv_sec = -1; 785 vap->va_birthtime.tv_nsec = 0; 786 vap->va_fsid = VNOVAL; 787 vap->va_rdev = NODEV; 788 789 error = VOP_GETATTR(vp, vap, active_cred); 790 if (error) 791 return (error); 792 793 /* 794 * Zero the spare stat fields 795 */ 796 bzero(sb, sizeof *sb); 797 798 /* 799 * Copy from vattr table 800 */ 801 if (vap->va_fsid != VNOVAL) 802 sb->st_dev = vap->va_fsid; 803 else 804 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 805 sb->st_ino = vap->va_fileid; 806 mode = vap->va_mode; 807 switch (vap->va_type) { 808 case VREG: 809 mode |= S_IFREG; 810 break; 811 case VDIR: 812 mode |= S_IFDIR; 813 break; 814 case VBLK: 815 mode |= S_IFBLK; 816 break; 817 case VCHR: 818 mode |= S_IFCHR; 819 break; 820 case VLNK: 821 mode |= S_IFLNK; 822 break; 823 case VSOCK: 824 mode |= S_IFSOCK; 825 break; 826 case VFIFO: 827 mode |= S_IFIFO; 828 break; 829 default: 830 return (EBADF); 831 }; 832 sb->st_mode = mode; 833 sb->st_nlink = vap->va_nlink; 834 sb->st_uid = vap->va_uid; 835 sb->st_gid = vap->va_gid; 836 sb->st_rdev = vap->va_rdev; 837 if (vap->va_size > OFF_MAX) 838 return (EOVERFLOW); 839 sb->st_size = vap->va_size; 840 sb->st_atim = vap->va_atime; 841 sb->st_mtim = vap->va_mtime; 842 sb->st_ctim = vap->va_ctime; 843 sb->st_birthtim = vap->va_birthtime; 844 845 /* 846 * According to www.opengroup.org, the meaning of st_blksize is 847 * "a filesystem-specific preferred I/O block size for this 848 * object. In some filesystem types, this may vary from file 849 * to file" 850 * Use miminum/default of PAGE_SIZE (e.g. for VCHR). 851 */ 852 853 sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize); 854 855 sb->st_flags = vap->va_flags; 856 if (priv_check(td, PRIV_VFS_GENERATION)) 857 sb->st_gen = 0; 858 else 859 sb->st_gen = vap->va_gen; 860 861 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 862 return (0); 863 } 864 865 /* 866 * File table vnode ioctl routine. 867 */ 868 static int 869 vn_ioctl(fp, com, data, active_cred, td) 870 struct file *fp; 871 u_long com; 872 void *data; 873 struct ucred *active_cred; 874 struct thread *td; 875 { 876 struct vnode *vp = fp->f_vnode; 877 struct vattr vattr; 878 int vfslocked; 879 int error; 880 881 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 882 error = ENOTTY; 883 switch (vp->v_type) { 884 case VREG: 885 case VDIR: 886 if (com == FIONREAD) { 887 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 888 error = VOP_GETATTR(vp, &vattr, active_cred); 889 VOP_UNLOCK(vp, 0); 890 if (!error) 891 *(int *)data = vattr.va_size - fp->f_offset; 892 } 893 if (com == FIONBIO || com == FIOASYNC) /* XXX */ 894 error = 0; 895 else 896 error = VOP_IOCTL(vp, com, data, fp->f_flag, 897 active_cred, td); 898 break; 899 900 default: 901 break; 902 } 903 VFS_UNLOCK_GIANT(vfslocked); 904 return (error); 905 } 906 907 /* 908 * File table vnode poll routine. 909 */ 910 static int 911 vn_poll(fp, events, active_cred, td) 912 struct file *fp; 913 int events; 914 struct ucred *active_cred; 915 struct thread *td; 916 { 917 struct vnode *vp; 918 int vfslocked; 919 int error; 920 921 vp = fp->f_vnode; 922 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 923 #ifdef MAC 924 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 925 error = mac_vnode_check_poll(active_cred, fp->f_cred, vp); 926 VOP_UNLOCK(vp, 0); 927 if (!error) 928 #endif 929 930 error = VOP_POLL(vp, events, fp->f_cred, td); 931 VFS_UNLOCK_GIANT(vfslocked); 932 return (error); 933 } 934 935 /* 936 * Acquire the requested lock and then check for validity. LK_RETRY 937 * permits vn_lock to return doomed vnodes. 938 */ 939 int 940 _vn_lock(struct vnode *vp, int flags, char *file, int line) 941 { 942 int error; 943 944 VNASSERT((flags & LK_TYPE_MASK) != 0, vp, 945 ("vn_lock called with no locktype.")); 946 do { 947 #ifdef DEBUG_VFS_LOCKS 948 KASSERT(vp->v_holdcnt != 0, 949 ("vn_lock %p: zero hold count", vp)); 950 #endif 951 error = VOP_LOCK1(vp, flags, file, line); 952 flags &= ~LK_INTERLOCK; /* Interlock is always dropped. */ 953 KASSERT((flags & LK_RETRY) == 0 || error == 0, 954 ("LK_RETRY set with incompatible flags (0x%x) or an error occured (%d)", 955 flags, error)); 956 /* 957 * Callers specify LK_RETRY if they wish to get dead vnodes. 958 * If RETRY is not set, we return ENOENT instead. 959 */ 960 if (error == 0 && vp->v_iflag & VI_DOOMED && 961 (flags & LK_RETRY) == 0) { 962 VOP_UNLOCK(vp, 0); 963 error = ENOENT; 964 break; 965 } 966 } while (flags & LK_RETRY && error != 0); 967 return (error); 968 } 969 970 /* 971 * File table vnode close routine. 972 */ 973 static int 974 vn_closefile(fp, td) 975 struct file *fp; 976 struct thread *td; 977 { 978 struct vnode *vp; 979 struct flock lf; 980 int vfslocked; 981 int error; 982 983 vp = fp->f_vnode; 984 985 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 986 if (fp->f_type == DTYPE_VNODE && fp->f_flag & FHASLOCK) { 987 lf.l_whence = SEEK_SET; 988 lf.l_start = 0; 989 lf.l_len = 0; 990 lf.l_type = F_UNLCK; 991 (void) VOP_ADVLOCK(vp, fp, F_UNLCK, &lf, F_FLOCK); 992 } 993 994 fp->f_ops = &badfileops; 995 996 error = vn_close(vp, fp->f_flag, fp->f_cred, td); 997 VFS_UNLOCK_GIANT(vfslocked); 998 return (error); 999 } 1000 1001 /* 1002 * Preparing to start a filesystem write operation. If the operation is 1003 * permitted, then we bump the count of operations in progress and 1004 * proceed. If a suspend request is in progress, we wait until the 1005 * suspension is over, and then proceed. 1006 */ 1007 int 1008 vn_start_write(vp, mpp, flags) 1009 struct vnode *vp; 1010 struct mount **mpp; 1011 int flags; 1012 { 1013 struct mount *mp; 1014 int error; 1015 1016 error = 0; 1017 /* 1018 * If a vnode is provided, get and return the mount point that 1019 * to which it will write. 1020 */ 1021 if (vp != NULL) { 1022 if ((error = VOP_GETWRITEMOUNT(vp, mpp)) != 0) { 1023 *mpp = NULL; 1024 if (error != EOPNOTSUPP) 1025 return (error); 1026 return (0); 1027 } 1028 } 1029 if ((mp = *mpp) == NULL) 1030 return (0); 1031 1032 /* 1033 * VOP_GETWRITEMOUNT() returns with the mp refcount held through 1034 * a vfs_ref(). 1035 * As long as a vnode is not provided we need to acquire a 1036 * refcount for the provided mountpoint too, in order to 1037 * emulate a vfs_ref(). 1038 */ 1039 MNT_ILOCK(mp); 1040 if (vp == NULL) 1041 MNT_REF(mp); 1042 1043 /* 1044 * Check on status of suspension. 1045 */ 1046 if ((curthread->td_pflags & TDP_IGNSUSP) == 0 || 1047 mp->mnt_susp_owner != curthread) { 1048 while ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0) { 1049 if (flags & V_NOWAIT) { 1050 error = EWOULDBLOCK; 1051 goto unlock; 1052 } 1053 error = msleep(&mp->mnt_flag, MNT_MTX(mp), 1054 (PUSER - 1) | (flags & PCATCH), "suspfs", 0); 1055 if (error) 1056 goto unlock; 1057 } 1058 } 1059 if (flags & V_XSLEEP) 1060 goto unlock; 1061 mp->mnt_writeopcount++; 1062 unlock: 1063 if (error != 0 || (flags & V_XSLEEP) != 0) 1064 MNT_REL(mp); 1065 MNT_IUNLOCK(mp); 1066 return (error); 1067 } 1068 1069 /* 1070 * Secondary suspension. Used by operations such as vop_inactive 1071 * routines that are needed by the higher level functions. These 1072 * are allowed to proceed until all the higher level functions have 1073 * completed (indicated by mnt_writeopcount dropping to zero). At that 1074 * time, these operations are halted until the suspension is over. 1075 */ 1076 int 1077 vn_start_secondary_write(vp, mpp, flags) 1078 struct vnode *vp; 1079 struct mount **mpp; 1080 int flags; 1081 { 1082 struct mount *mp; 1083 int error; 1084 1085 retry: 1086 if (vp != NULL) { 1087 if ((error = VOP_GETWRITEMOUNT(vp, mpp)) != 0) { 1088 *mpp = NULL; 1089 if (error != EOPNOTSUPP) 1090 return (error); 1091 return (0); 1092 } 1093 } 1094 /* 1095 * If we are not suspended or have not yet reached suspended 1096 * mode, then let the operation proceed. 1097 */ 1098 if ((mp = *mpp) == NULL) 1099 return (0); 1100 1101 /* 1102 * VOP_GETWRITEMOUNT() returns with the mp refcount held through 1103 * a vfs_ref(). 1104 * As long as a vnode is not provided we need to acquire a 1105 * refcount for the provided mountpoint too, in order to 1106 * emulate a vfs_ref(). 1107 */ 1108 MNT_ILOCK(mp); 1109 if (vp == NULL) 1110 MNT_REF(mp); 1111 if ((mp->mnt_kern_flag & (MNTK_SUSPENDED | MNTK_SUSPEND2)) == 0) { 1112 mp->mnt_secondary_writes++; 1113 mp->mnt_secondary_accwrites++; 1114 MNT_IUNLOCK(mp); 1115 return (0); 1116 } 1117 if (flags & V_NOWAIT) { 1118 MNT_REL(mp); 1119 MNT_IUNLOCK(mp); 1120 return (EWOULDBLOCK); 1121 } 1122 /* 1123 * Wait for the suspension to finish. 1124 */ 1125 error = msleep(&mp->mnt_flag, MNT_MTX(mp), 1126 (PUSER - 1) | (flags & PCATCH) | PDROP, "suspfs", 0); 1127 vfs_rel(mp); 1128 if (error == 0) 1129 goto retry; 1130 return (error); 1131 } 1132 1133 /* 1134 * Filesystem write operation has completed. If we are suspending and this 1135 * operation is the last one, notify the suspender that the suspension is 1136 * now in effect. 1137 */ 1138 void 1139 vn_finished_write(mp) 1140 struct mount *mp; 1141 { 1142 if (mp == NULL) 1143 return; 1144 MNT_ILOCK(mp); 1145 MNT_REL(mp); 1146 mp->mnt_writeopcount--; 1147 if (mp->mnt_writeopcount < 0) 1148 panic("vn_finished_write: neg cnt"); 1149 if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0 && 1150 mp->mnt_writeopcount <= 0) 1151 wakeup(&mp->mnt_writeopcount); 1152 MNT_IUNLOCK(mp); 1153 } 1154 1155 1156 /* 1157 * Filesystem secondary write operation has completed. If we are 1158 * suspending and this operation is the last one, notify the suspender 1159 * that the suspension is now in effect. 1160 */ 1161 void 1162 vn_finished_secondary_write(mp) 1163 struct mount *mp; 1164 { 1165 if (mp == NULL) 1166 return; 1167 MNT_ILOCK(mp); 1168 MNT_REL(mp); 1169 mp->mnt_secondary_writes--; 1170 if (mp->mnt_secondary_writes < 0) 1171 panic("vn_finished_secondary_write: neg cnt"); 1172 if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0 && 1173 mp->mnt_secondary_writes <= 0) 1174 wakeup(&mp->mnt_secondary_writes); 1175 MNT_IUNLOCK(mp); 1176 } 1177 1178 1179 1180 /* 1181 * Request a filesystem to suspend write operations. 1182 */ 1183 int 1184 vfs_write_suspend(mp) 1185 struct mount *mp; 1186 { 1187 int error; 1188 1189 MNT_ILOCK(mp); 1190 if (mp->mnt_susp_owner == curthread) { 1191 MNT_IUNLOCK(mp); 1192 return (EALREADY); 1193 } 1194 while (mp->mnt_kern_flag & MNTK_SUSPEND) 1195 msleep(&mp->mnt_flag, MNT_MTX(mp), PUSER - 1, "wsuspfs", 0); 1196 mp->mnt_kern_flag |= MNTK_SUSPEND; 1197 mp->mnt_susp_owner = curthread; 1198 if (mp->mnt_writeopcount > 0) 1199 (void) msleep(&mp->mnt_writeopcount, 1200 MNT_MTX(mp), (PUSER - 1)|PDROP, "suspwt", 0); 1201 else 1202 MNT_IUNLOCK(mp); 1203 if ((error = VFS_SYNC(mp, MNT_SUSPEND)) != 0) 1204 vfs_write_resume(mp); 1205 return (error); 1206 } 1207 1208 /* 1209 * Request a filesystem to resume write operations. 1210 */ 1211 void 1212 vfs_write_resume(mp) 1213 struct mount *mp; 1214 { 1215 1216 MNT_ILOCK(mp); 1217 if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0) { 1218 KASSERT(mp->mnt_susp_owner == curthread, ("mnt_susp_owner")); 1219 mp->mnt_kern_flag &= ~(MNTK_SUSPEND | MNTK_SUSPEND2 | 1220 MNTK_SUSPENDED); 1221 mp->mnt_susp_owner = NULL; 1222 wakeup(&mp->mnt_writeopcount); 1223 wakeup(&mp->mnt_flag); 1224 curthread->td_pflags &= ~TDP_IGNSUSP; 1225 MNT_IUNLOCK(mp); 1226 VFS_SUSP_CLEAN(mp); 1227 } else 1228 MNT_IUNLOCK(mp); 1229 } 1230 1231 /* 1232 * Implement kqueues for files by translating it to vnode operation. 1233 */ 1234 static int 1235 vn_kqfilter(struct file *fp, struct knote *kn) 1236 { 1237 int vfslocked; 1238 int error; 1239 1240 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); 1241 error = VOP_KQFILTER(fp->f_vnode, kn); 1242 VFS_UNLOCK_GIANT(vfslocked); 1243 1244 return error; 1245 } 1246 1247 /* 1248 * Simplified in-kernel wrapper calls for extended attribute access. 1249 * Both calls pass in a NULL credential, authorizing as "kernel" access. 1250 * Set IO_NODELOCKED in ioflg if the vnode is already locked. 1251 */ 1252 int 1253 vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, 1254 const char *attrname, int *buflen, char *buf, struct thread *td) 1255 { 1256 struct uio auio; 1257 struct iovec iov; 1258 int error; 1259 1260 iov.iov_len = *buflen; 1261 iov.iov_base = buf; 1262 1263 auio.uio_iov = &iov; 1264 auio.uio_iovcnt = 1; 1265 auio.uio_rw = UIO_READ; 1266 auio.uio_segflg = UIO_SYSSPACE; 1267 auio.uio_td = td; 1268 auio.uio_offset = 0; 1269 auio.uio_resid = *buflen; 1270 1271 if ((ioflg & IO_NODELOCKED) == 0) 1272 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1273 1274 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held"); 1275 1276 /* authorize attribute retrieval as kernel */ 1277 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL, 1278 td); 1279 1280 if ((ioflg & IO_NODELOCKED) == 0) 1281 VOP_UNLOCK(vp, 0); 1282 1283 if (error == 0) { 1284 *buflen = *buflen - auio.uio_resid; 1285 } 1286 1287 return (error); 1288 } 1289 1290 /* 1291 * XXX failure mode if partially written? 1292 */ 1293 int 1294 vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, 1295 const char *attrname, int buflen, char *buf, struct thread *td) 1296 { 1297 struct uio auio; 1298 struct iovec iov; 1299 struct mount *mp; 1300 int error; 1301 1302 iov.iov_len = buflen; 1303 iov.iov_base = buf; 1304 1305 auio.uio_iov = &iov; 1306 auio.uio_iovcnt = 1; 1307 auio.uio_rw = UIO_WRITE; 1308 auio.uio_segflg = UIO_SYSSPACE; 1309 auio.uio_td = td; 1310 auio.uio_offset = 0; 1311 auio.uio_resid = buflen; 1312 1313 if ((ioflg & IO_NODELOCKED) == 0) { 1314 if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0) 1315 return (error); 1316 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1317 } 1318 1319 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held"); 1320 1321 /* authorize attribute setting as kernel */ 1322 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, td); 1323 1324 if ((ioflg & IO_NODELOCKED) == 0) { 1325 vn_finished_write(mp); 1326 VOP_UNLOCK(vp, 0); 1327 } 1328 1329 return (error); 1330 } 1331 1332 int 1333 vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, 1334 const char *attrname, struct thread *td) 1335 { 1336 struct mount *mp; 1337 int error; 1338 1339 if ((ioflg & IO_NODELOCKED) == 0) { 1340 if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0) 1341 return (error); 1342 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1343 } 1344 1345 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held"); 1346 1347 /* authorize attribute removal as kernel */ 1348 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL, td); 1349 if (error == EOPNOTSUPP) 1350 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, 1351 NULL, td); 1352 1353 if ((ioflg & IO_NODELOCKED) == 0) { 1354 vn_finished_write(mp); 1355 VOP_UNLOCK(vp, 0); 1356 } 1357 1358 return (error); 1359 } 1360 1361 int 1362 vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags, struct vnode **rvp) 1363 { 1364 struct mount *mp; 1365 int ltype, error; 1366 1367 mp = vp->v_mount; 1368 ltype = VOP_ISLOCKED(vp); 1369 KASSERT(ltype == LK_EXCLUSIVE || ltype == LK_SHARED, 1370 ("vn_vget_ino: vp not locked")); 1371 error = vfs_busy(mp, MBF_NOWAIT); 1372 if (error != 0) { 1373 vfs_ref(mp); 1374 VOP_UNLOCK(vp, 0); 1375 error = vfs_busy(mp, 0); 1376 vn_lock(vp, ltype | LK_RETRY); 1377 vfs_rel(mp); 1378 if (error != 0) 1379 return (ENOENT); 1380 if (vp->v_iflag & VI_DOOMED) { 1381 vfs_unbusy(mp); 1382 return (ENOENT); 1383 } 1384 } 1385 VOP_UNLOCK(vp, 0); 1386 error = VFS_VGET(mp, ino, lkflags, rvp); 1387 vfs_unbusy(mp); 1388 vn_lock(vp, ltype | LK_RETRY); 1389 if (vp->v_iflag & VI_DOOMED) { 1390 if (error == 0) 1391 vput(*rvp); 1392 error = ENOENT; 1393 } 1394 return (error); 1395 } 1396 1397 int 1398 vn_rlimit_fsize(const struct vnode *vp, const struct uio *uio, 1399 const struct thread *td) 1400 { 1401 1402 if (vp->v_type != VREG || td == NULL) 1403 return (0); 1404 PROC_LOCK(td->td_proc); 1405 if ((uoff_t)uio->uio_offset + uio->uio_resid > 1406 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 1407 kern_psignal(td->td_proc, SIGXFSZ); 1408 PROC_UNLOCK(td->td_proc); 1409 return (EFBIG); 1410 } 1411 PROC_UNLOCK(td->td_proc); 1412 return (0); 1413 } 1414 1415 int 1416 vn_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, 1417 struct thread *td) 1418 { 1419 struct vnode *vp; 1420 int error, vfslocked; 1421 1422 vp = fp->f_vnode; 1423 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 1424 #ifdef AUDIT 1425 vn_lock(vp, LK_SHARED | LK_RETRY); 1426 AUDIT_ARG_VNODE1(vp); 1427 VOP_UNLOCK(vp, 0); 1428 #endif 1429 error = setfmode(td, active_cred, vp, mode); 1430 VFS_UNLOCK_GIANT(vfslocked); 1431 return (error); 1432 } 1433 1434 int 1435 vn_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, 1436 struct thread *td) 1437 { 1438 struct vnode *vp; 1439 int error, vfslocked; 1440 1441 vp = fp->f_vnode; 1442 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 1443 #ifdef AUDIT 1444 vn_lock(vp, LK_SHARED | LK_RETRY); 1445 AUDIT_ARG_VNODE1(vp); 1446 VOP_UNLOCK(vp, 0); 1447 #endif 1448 error = setfown(td, active_cred, vp, uid, gid); 1449 VFS_UNLOCK_GIANT(vfslocked); 1450 return (error); 1451 } 1452 1453 void 1454 vn_pages_remove(struct vnode *vp, vm_pindex_t start, vm_pindex_t end) 1455 { 1456 vm_object_t object; 1457 1458 if ((object = vp->v_object) == NULL) 1459 return; 1460 VM_OBJECT_LOCK(object); 1461 vm_object_page_remove(object, start, end, 0); 1462 VM_OBJECT_UNLOCK(object); 1463 } 1464