Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_vnops.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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: releng/9.0/sys/kern/vfs_vnops.c 225617 2011-09-16 13:58:51Z kmacy $"); 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 vfslocked; 522 523 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", 524 uio->uio_td, td)); 525 mtxp = NULL; 526 vp = fp->f_vnode; 527 ioflag = 0; 528 if (fp->f_flag & FNONBLOCK) 529 ioflag |= IO_NDELAY; 530 if (fp->f_flag & O_DIRECT) 531 ioflag |= IO_DIRECT; 532 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 533 /* 534 * According to McKusick the vn lock was protecting f_offset here. 535 * It is now protected by the FOFFSET_LOCKED flag. 536 */ 537 if ((flags & FOF_OFFSET) == 0) { 538 mtxp = mtx_pool_find(mtxpool_sleep, fp); 539 mtx_lock(mtxp); 540 while(fp->f_vnread_flags & FOFFSET_LOCKED) { 541 fp->f_vnread_flags |= FOFFSET_LOCK_WAITING; 542 msleep(&fp->f_vnread_flags, mtxp, PUSER -1, 543 "vnread offlock", 0); 544 } 545 fp->f_vnread_flags |= FOFFSET_LOCKED; 546 mtx_unlock(mtxp); 547 vn_lock(vp, LK_SHARED | LK_RETRY); 548 uio->uio_offset = fp->f_offset; 549 } else 550 vn_lock(vp, LK_SHARED | LK_RETRY); 551 552 ioflag |= sequential_heuristic(uio, fp); 553 554 #ifdef MAC 555 error = mac_vnode_check_read(active_cred, fp->f_cred, vp); 556 if (error == 0) 557 #endif 558 error = VOP_READ(vp, uio, ioflag, fp->f_cred); 559 if ((flags & FOF_OFFSET) == 0) { 560 fp->f_offset = uio->uio_offset; 561 mtx_lock(mtxp); 562 if (fp->f_vnread_flags & FOFFSET_LOCK_WAITING) 563 wakeup(&fp->f_vnread_flags); 564 fp->f_vnread_flags = 0; 565 mtx_unlock(mtxp); 566 } 567 fp->f_nextoff = uio->uio_offset; 568 VOP_UNLOCK(vp, 0); 569 VFS_UNLOCK_GIANT(vfslocked); 570 return (error); 571 } 572 573 /* 574 * File table vnode write routine. 575 */ 576 static int 577 vn_write(fp, uio, active_cred, flags, td) 578 struct file *fp; 579 struct uio *uio; 580 struct ucred *active_cred; 581 int flags; 582 struct thread *td; 583 { 584 struct vnode *vp; 585 struct mount *mp; 586 int error, ioflag, lock_flags; 587 int vfslocked; 588 589 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", 590 uio->uio_td, td)); 591 vp = fp->f_vnode; 592 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 593 if (vp->v_type == VREG) 594 bwillwrite(); 595 ioflag = IO_UNIT; 596 if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) 597 ioflag |= IO_APPEND; 598 if (fp->f_flag & FNONBLOCK) 599 ioflag |= IO_NDELAY; 600 if (fp->f_flag & O_DIRECT) 601 ioflag |= IO_DIRECT; 602 if ((fp->f_flag & O_FSYNC) || 603 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 604 ioflag |= IO_SYNC; 605 mp = NULL; 606 if (vp->v_type != VCHR && 607 (error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 608 goto unlock; 609 610 if ((MNT_SHARED_WRITES(mp) || 611 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) && 612 (flags & FOF_OFFSET) != 0) { 613 lock_flags = LK_SHARED; 614 } else { 615 lock_flags = LK_EXCLUSIVE; 616 } 617 618 vn_lock(vp, lock_flags | LK_RETRY); 619 if ((flags & FOF_OFFSET) == 0) 620 uio->uio_offset = fp->f_offset; 621 ioflag |= sequential_heuristic(uio, fp); 622 #ifdef MAC 623 error = mac_vnode_check_write(active_cred, fp->f_cred, vp); 624 if (error == 0) 625 #endif 626 error = VOP_WRITE(vp, uio, ioflag, fp->f_cred); 627 if ((flags & FOF_OFFSET) == 0) 628 fp->f_offset = uio->uio_offset; 629 fp->f_nextoff = uio->uio_offset; 630 VOP_UNLOCK(vp, 0); 631 if (vp->v_type != VCHR) 632 vn_finished_write(mp); 633 unlock: 634 VFS_UNLOCK_GIANT(vfslocked); 635 return (error); 636 } 637 638 /* 639 * File table truncate routine. 640 */ 641 static int 642 vn_truncate(fp, length, active_cred, td) 643 struct file *fp; 644 off_t length; 645 struct ucred *active_cred; 646 struct thread *td; 647 { 648 struct vattr vattr; 649 struct mount *mp; 650 struct vnode *vp; 651 int vfslocked; 652 int error; 653 654 vp = fp->f_vnode; 655 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 656 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 657 if (error) { 658 VFS_UNLOCK_GIANT(vfslocked); 659 return (error); 660 } 661 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 662 if (vp->v_type == VDIR) { 663 error = EISDIR; 664 goto out; 665 } 666 #ifdef MAC 667 error = mac_vnode_check_write(active_cred, fp->f_cred, vp); 668 if (error) 669 goto out; 670 #endif 671 error = vn_writechk(vp); 672 if (error == 0) { 673 VATTR_NULL(&vattr); 674 vattr.va_size = length; 675 error = VOP_SETATTR(vp, &vattr, fp->f_cred); 676 } 677 out: 678 VOP_UNLOCK(vp, 0); 679 vn_finished_write(mp); 680 VFS_UNLOCK_GIANT(vfslocked); 681 return (error); 682 } 683 684 /* 685 * File table vnode stat routine. 686 */ 687 static int 688 vn_statfile(fp, sb, active_cred, td) 689 struct file *fp; 690 struct stat *sb; 691 struct ucred *active_cred; 692 struct thread *td; 693 { 694 struct vnode *vp = fp->f_vnode; 695 int vfslocked; 696 int error; 697 698 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 699 vn_lock(vp, LK_SHARED | LK_RETRY); 700 error = vn_stat(vp, sb, active_cred, fp->f_cred, td); 701 VOP_UNLOCK(vp, 0); 702 VFS_UNLOCK_GIANT(vfslocked); 703 704 return (error); 705 } 706 707 /* 708 * Stat a vnode; implementation for the stat syscall 709 */ 710 int 711 vn_stat(vp, sb, active_cred, file_cred, td) 712 struct vnode *vp; 713 register struct stat *sb; 714 struct ucred *active_cred; 715 struct ucred *file_cred; 716 struct thread *td; 717 { 718 struct vattr vattr; 719 register struct vattr *vap; 720 int error; 721 u_short mode; 722 723 #ifdef MAC 724 error = mac_vnode_check_stat(active_cred, file_cred, vp); 725 if (error) 726 return (error); 727 #endif 728 729 vap = &vattr; 730 731 /* 732 * Initialize defaults for new and unusual fields, so that file 733 * systems which don't support these fields don't need to know 734 * about them. 735 */ 736 vap->va_birthtime.tv_sec = -1; 737 vap->va_birthtime.tv_nsec = 0; 738 vap->va_fsid = VNOVAL; 739 vap->va_rdev = NODEV; 740 741 error = VOP_GETATTR(vp, vap, active_cred); 742 if (error) 743 return (error); 744 745 /* 746 * Zero the spare stat fields 747 */ 748 bzero(sb, sizeof *sb); 749 750 /* 751 * Copy from vattr table 752 */ 753 if (vap->va_fsid != VNOVAL) 754 sb->st_dev = vap->va_fsid; 755 else 756 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 757 sb->st_ino = vap->va_fileid; 758 mode = vap->va_mode; 759 switch (vap->va_type) { 760 case VREG: 761 mode |= S_IFREG; 762 break; 763 case VDIR: 764 mode |= S_IFDIR; 765 break; 766 case VBLK: 767 mode |= S_IFBLK; 768 break; 769 case VCHR: 770 mode |= S_IFCHR; 771 break; 772 case VLNK: 773 mode |= S_IFLNK; 774 break; 775 case VSOCK: 776 mode |= S_IFSOCK; 777 break; 778 case VFIFO: 779 mode |= S_IFIFO; 780 break; 781 default: 782 return (EBADF); 783 }; 784 sb->st_mode = mode; 785 sb->st_nlink = vap->va_nlink; 786 sb->st_uid = vap->va_uid; 787 sb->st_gid = vap->va_gid; 788 sb->st_rdev = vap->va_rdev; 789 if (vap->va_size > OFF_MAX) 790 return (EOVERFLOW); 791 sb->st_size = vap->va_size; 792 sb->st_atim = vap->va_atime; 793 sb->st_mtim = vap->va_mtime; 794 sb->st_ctim = vap->va_ctime; 795 sb->st_birthtim = vap->va_birthtime; 796 797 /* 798 * According to www.opengroup.org, the meaning of st_blksize is 799 * "a filesystem-specific preferred I/O block size for this 800 * object. In some filesystem types, this may vary from file 801 * to file" 802 * Use miminum/default of PAGE_SIZE (e.g. for VCHR). 803 */ 804 805 sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize); 806 807 sb->st_flags = vap->va_flags; 808 if (priv_check(td, PRIV_VFS_GENERATION)) 809 sb->st_gen = 0; 810 else 811 sb->st_gen = vap->va_gen; 812 813 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 814 return (0); 815 } 816 817 /* 818 * File table vnode ioctl routine. 819 */ 820 static int 821 vn_ioctl(fp, com, data, active_cred, td) 822 struct file *fp; 823 u_long com; 824 void *data; 825 struct ucred *active_cred; 826 struct thread *td; 827 { 828 struct vnode *vp = fp->f_vnode; 829 struct vattr vattr; 830 int vfslocked; 831 int error; 832 833 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 834 error = ENOTTY; 835 switch (vp->v_type) { 836 case VREG: 837 case VDIR: 838 if (com == FIONREAD) { 839 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 840 error = VOP_GETATTR(vp, &vattr, active_cred); 841 VOP_UNLOCK(vp, 0); 842 if (!error) 843 *(int *)data = vattr.va_size - fp->f_offset; 844 } 845 if (com == FIONBIO || com == FIOASYNC) /* XXX */ 846 error = 0; 847 else 848 error = VOP_IOCTL(vp, com, data, fp->f_flag, 849 active_cred, td); 850 break; 851 852 default: 853 break; 854 } 855 VFS_UNLOCK_GIANT(vfslocked); 856 return (error); 857 } 858 859 /* 860 * File table vnode poll routine. 861 */ 862 static int 863 vn_poll(fp, events, active_cred, td) 864 struct file *fp; 865 int events; 866 struct ucred *active_cred; 867 struct thread *td; 868 { 869 struct vnode *vp; 870 int vfslocked; 871 int error; 872 873 vp = fp->f_vnode; 874 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 875 #ifdef MAC 876 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 877 error = mac_vnode_check_poll(active_cred, fp->f_cred, vp); 878 VOP_UNLOCK(vp, 0); 879 if (!error) 880 #endif 881 882 error = VOP_POLL(vp, events, fp->f_cred, td); 883 VFS_UNLOCK_GIANT(vfslocked); 884 return (error); 885 } 886 887 /* 888 * Acquire the requested lock and then check for validity. LK_RETRY 889 * permits vn_lock to return doomed vnodes. 890 */ 891 int 892 _vn_lock(struct vnode *vp, int flags, char *file, int line) 893 { 894 int error; 895 896 VNASSERT((flags & LK_TYPE_MASK) != 0, vp, 897 ("vn_lock called with no locktype.")); 898 do { 899 #ifdef DEBUG_VFS_LOCKS 900 KASSERT(vp->v_holdcnt != 0, 901 ("vn_lock %p: zero hold count", vp)); 902 #endif 903 error = VOP_LOCK1(vp, flags, file, line); 904 flags &= ~LK_INTERLOCK; /* Interlock is always dropped. */ 905 KASSERT((flags & LK_RETRY) == 0 || error == 0, 906 ("LK_RETRY set with incompatible flags (0x%x) or an error occured (%d)", 907 flags, error)); 908 /* 909 * Callers specify LK_RETRY if they wish to get dead vnodes. 910 * If RETRY is not set, we return ENOENT instead. 911 */ 912 if (error == 0 && vp->v_iflag & VI_DOOMED && 913 (flags & LK_RETRY) == 0) { 914 VOP_UNLOCK(vp, 0); 915 error = ENOENT; 916 break; 917 } 918 } while (flags & LK_RETRY && error != 0); 919 return (error); 920 } 921 922 /* 923 * File table vnode close routine. 924 */ 925 static int 926 vn_closefile(fp, td) 927 struct file *fp; 928 struct thread *td; 929 { 930 struct vnode *vp; 931 struct flock lf; 932 int vfslocked; 933 int error; 934 935 vp = fp->f_vnode; 936 937 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 938 if (fp->f_type == DTYPE_VNODE && fp->f_flag & FHASLOCK) { 939 lf.l_whence = SEEK_SET; 940 lf.l_start = 0; 941 lf.l_len = 0; 942 lf.l_type = F_UNLCK; 943 (void) VOP_ADVLOCK(vp, fp, F_UNLCK, &lf, F_FLOCK); 944 } 945 946 fp->f_ops = &badfileops; 947 948 error = vn_close(vp, fp->f_flag, fp->f_cred, td); 949 VFS_UNLOCK_GIANT(vfslocked); 950 return (error); 951 } 952 953 /* 954 * Preparing to start a filesystem write operation. If the operation is 955 * permitted, then we bump the count of operations in progress and 956 * proceed. If a suspend request is in progress, we wait until the 957 * suspension is over, and then proceed. 958 */ 959 int 960 vn_start_write(vp, mpp, flags) 961 struct vnode *vp; 962 struct mount **mpp; 963 int flags; 964 { 965 struct mount *mp; 966 int error; 967 968 error = 0; 969 /* 970 * If a vnode is provided, get and return the mount point that 971 * to which it will write. 972 */ 973 if (vp != NULL) { 974 if ((error = VOP_GETWRITEMOUNT(vp, mpp)) != 0) { 975 *mpp = NULL; 976 if (error != EOPNOTSUPP) 977 return (error); 978 return (0); 979 } 980 } 981 if ((mp = *mpp) == NULL) 982 return (0); 983 984 /* 985 * VOP_GETWRITEMOUNT() returns with the mp refcount held through 986 * a vfs_ref(). 987 * As long as a vnode is not provided we need to acquire a 988 * refcount for the provided mountpoint too, in order to 989 * emulate a vfs_ref(). 990 */ 991 MNT_ILOCK(mp); 992 if (vp == NULL) 993 MNT_REF(mp); 994 995 /* 996 * Check on status of suspension. 997 */ 998 if ((curthread->td_pflags & TDP_IGNSUSP) == 0 || 999 mp->mnt_susp_owner != curthread) { 1000 while ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0) { 1001 if (flags & V_NOWAIT) { 1002 error = EWOULDBLOCK; 1003 goto unlock; 1004 } 1005 error = msleep(&mp->mnt_flag, MNT_MTX(mp), 1006 (PUSER - 1) | (flags & PCATCH), "suspfs", 0); 1007 if (error) 1008 goto unlock; 1009 } 1010 } 1011 if (flags & V_XSLEEP) 1012 goto unlock; 1013 mp->mnt_writeopcount++; 1014 unlock: 1015 if (error != 0 || (flags & V_XSLEEP) != 0) 1016 MNT_REL(mp); 1017 MNT_IUNLOCK(mp); 1018 return (error); 1019 } 1020 1021 /* 1022 * Secondary suspension. Used by operations such as vop_inactive 1023 * routines that are needed by the higher level functions. These 1024 * are allowed to proceed until all the higher level functions have 1025 * completed (indicated by mnt_writeopcount dropping to zero). At that 1026 * time, these operations are halted until the suspension is over. 1027 */ 1028 int 1029 vn_start_secondary_write(vp, mpp, flags) 1030 struct vnode *vp; 1031 struct mount **mpp; 1032 int flags; 1033 { 1034 struct mount *mp; 1035 int error; 1036 1037 retry: 1038 if (vp != NULL) { 1039 if ((error = VOP_GETWRITEMOUNT(vp, mpp)) != 0) { 1040 *mpp = NULL; 1041 if (error != EOPNOTSUPP) 1042 return (error); 1043 return (0); 1044 } 1045 } 1046 /* 1047 * If we are not suspended or have not yet reached suspended 1048 * mode, then let the operation proceed. 1049 */ 1050 if ((mp = *mpp) == NULL) 1051 return (0); 1052 1053 /* 1054 * VOP_GETWRITEMOUNT() returns with the mp refcount held through 1055 * a vfs_ref(). 1056 * As long as a vnode is not provided we need to acquire a 1057 * refcount for the provided mountpoint too, in order to 1058 * emulate a vfs_ref(). 1059 */ 1060 MNT_ILOCK(mp); 1061 if (vp == NULL) 1062 MNT_REF(mp); 1063 if ((mp->mnt_kern_flag & (MNTK_SUSPENDED | MNTK_SUSPEND2)) == 0) { 1064 mp->mnt_secondary_writes++; 1065 mp->mnt_secondary_accwrites++; 1066 MNT_IUNLOCK(mp); 1067 return (0); 1068 } 1069 if (flags & V_NOWAIT) { 1070 MNT_REL(mp); 1071 MNT_IUNLOCK(mp); 1072 return (EWOULDBLOCK); 1073 } 1074 /* 1075 * Wait for the suspension to finish. 1076 */ 1077 error = msleep(&mp->mnt_flag, MNT_MTX(mp), 1078 (PUSER - 1) | (flags & PCATCH) | PDROP, "suspfs", 0); 1079 vfs_rel(mp); 1080 if (error == 0) 1081 goto retry; 1082 return (error); 1083 } 1084 1085 /* 1086 * Filesystem write operation has completed. If we are suspending and this 1087 * operation is the last one, notify the suspender that the suspension is 1088 * now in effect. 1089 */ 1090 void 1091 vn_finished_write(mp) 1092 struct mount *mp; 1093 { 1094 if (mp == NULL) 1095 return; 1096 MNT_ILOCK(mp); 1097 MNT_REL(mp); 1098 mp->mnt_writeopcount--; 1099 if (mp->mnt_writeopcount < 0) 1100 panic("vn_finished_write: neg cnt"); 1101 if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0 && 1102 mp->mnt_writeopcount <= 0) 1103 wakeup(&mp->mnt_writeopcount); 1104 MNT_IUNLOCK(mp); 1105 } 1106 1107 1108 /* 1109 * Filesystem secondary write operation has completed. If we are 1110 * suspending and this operation is the last one, notify the suspender 1111 * that the suspension is now in effect. 1112 */ 1113 void 1114 vn_finished_secondary_write(mp) 1115 struct mount *mp; 1116 { 1117 if (mp == NULL) 1118 return; 1119 MNT_ILOCK(mp); 1120 MNT_REL(mp); 1121 mp->mnt_secondary_writes--; 1122 if (mp->mnt_secondary_writes < 0) 1123 panic("vn_finished_secondary_write: neg cnt"); 1124 if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0 && 1125 mp->mnt_secondary_writes <= 0) 1126 wakeup(&mp->mnt_secondary_writes); 1127 MNT_IUNLOCK(mp); 1128 } 1129 1130 1131 1132 /* 1133 * Request a filesystem to suspend write operations. 1134 */ 1135 int 1136 vfs_write_suspend(mp) 1137 struct mount *mp; 1138 { 1139 int error; 1140 1141 MNT_ILOCK(mp); 1142 if (mp->mnt_susp_owner == curthread) { 1143 MNT_IUNLOCK(mp); 1144 return (EALREADY); 1145 } 1146 while (mp->mnt_kern_flag & MNTK_SUSPEND) 1147 msleep(&mp->mnt_flag, MNT_MTX(mp), PUSER - 1, "wsuspfs", 0); 1148 mp->mnt_kern_flag |= MNTK_SUSPEND; 1149 mp->mnt_susp_owner = curthread; 1150 if (mp->mnt_writeopcount > 0) 1151 (void) msleep(&mp->mnt_writeopcount, 1152 MNT_MTX(mp), (PUSER - 1)|PDROP, "suspwt", 0); 1153 else 1154 MNT_IUNLOCK(mp); 1155 if ((error = VFS_SYNC(mp, MNT_SUSPEND)) != 0) 1156 vfs_write_resume(mp); 1157 return (error); 1158 } 1159 1160 /* 1161 * Request a filesystem to resume write operations. 1162 */ 1163 void 1164 vfs_write_resume(mp) 1165 struct mount *mp; 1166 { 1167 1168 MNT_ILOCK(mp); 1169 if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0) { 1170 KASSERT(mp->mnt_susp_owner == curthread, ("mnt_susp_owner")); 1171 mp->mnt_kern_flag &= ~(MNTK_SUSPEND | MNTK_SUSPEND2 | 1172 MNTK_SUSPENDED); 1173 mp->mnt_susp_owner = NULL; 1174 wakeup(&mp->mnt_writeopcount); 1175 wakeup(&mp->mnt_flag); 1176 curthread->td_pflags &= ~TDP_IGNSUSP; 1177 MNT_IUNLOCK(mp); 1178 VFS_SUSP_CLEAN(mp); 1179 } else 1180 MNT_IUNLOCK(mp); 1181 } 1182 1183 /* 1184 * Implement kqueues for files by translating it to vnode operation. 1185 */ 1186 static int 1187 vn_kqfilter(struct file *fp, struct knote *kn) 1188 { 1189 int vfslocked; 1190 int error; 1191 1192 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); 1193 error = VOP_KQFILTER(fp->f_vnode, kn); 1194 VFS_UNLOCK_GIANT(vfslocked); 1195 1196 return error; 1197 } 1198 1199 /* 1200 * Simplified in-kernel wrapper calls for extended attribute access. 1201 * Both calls pass in a NULL credential, authorizing as "kernel" access. 1202 * Set IO_NODELOCKED in ioflg if the vnode is already locked. 1203 */ 1204 int 1205 vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, 1206 const char *attrname, int *buflen, char *buf, struct thread *td) 1207 { 1208 struct uio auio; 1209 struct iovec iov; 1210 int error; 1211 1212 iov.iov_len = *buflen; 1213 iov.iov_base = buf; 1214 1215 auio.uio_iov = &iov; 1216 auio.uio_iovcnt = 1; 1217 auio.uio_rw = UIO_READ; 1218 auio.uio_segflg = UIO_SYSSPACE; 1219 auio.uio_td = td; 1220 auio.uio_offset = 0; 1221 auio.uio_resid = *buflen; 1222 1223 if ((ioflg & IO_NODELOCKED) == 0) 1224 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1225 1226 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held"); 1227 1228 /* authorize attribute retrieval as kernel */ 1229 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL, 1230 td); 1231 1232 if ((ioflg & IO_NODELOCKED) == 0) 1233 VOP_UNLOCK(vp, 0); 1234 1235 if (error == 0) { 1236 *buflen = *buflen - auio.uio_resid; 1237 } 1238 1239 return (error); 1240 } 1241 1242 /* 1243 * XXX failure mode if partially written? 1244 */ 1245 int 1246 vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, 1247 const char *attrname, int buflen, char *buf, struct thread *td) 1248 { 1249 struct uio auio; 1250 struct iovec iov; 1251 struct mount *mp; 1252 int error; 1253 1254 iov.iov_len = buflen; 1255 iov.iov_base = buf; 1256 1257 auio.uio_iov = &iov; 1258 auio.uio_iovcnt = 1; 1259 auio.uio_rw = UIO_WRITE; 1260 auio.uio_segflg = UIO_SYSSPACE; 1261 auio.uio_td = td; 1262 auio.uio_offset = 0; 1263 auio.uio_resid = buflen; 1264 1265 if ((ioflg & IO_NODELOCKED) == 0) { 1266 if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0) 1267 return (error); 1268 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1269 } 1270 1271 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held"); 1272 1273 /* authorize attribute setting as kernel */ 1274 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, td); 1275 1276 if ((ioflg & IO_NODELOCKED) == 0) { 1277 vn_finished_write(mp); 1278 VOP_UNLOCK(vp, 0); 1279 } 1280 1281 return (error); 1282 } 1283 1284 int 1285 vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, 1286 const char *attrname, struct thread *td) 1287 { 1288 struct mount *mp; 1289 int error; 1290 1291 if ((ioflg & IO_NODELOCKED) == 0) { 1292 if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0) 1293 return (error); 1294 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1295 } 1296 1297 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held"); 1298 1299 /* authorize attribute removal as kernel */ 1300 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL, td); 1301 if (error == EOPNOTSUPP) 1302 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, 1303 NULL, td); 1304 1305 if ((ioflg & IO_NODELOCKED) == 0) { 1306 vn_finished_write(mp); 1307 VOP_UNLOCK(vp, 0); 1308 } 1309 1310 return (error); 1311 } 1312 1313 int 1314 vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags, struct vnode **rvp) 1315 { 1316 struct mount *mp; 1317 int ltype, error; 1318 1319 mp = vp->v_mount; 1320 ltype = VOP_ISLOCKED(vp); 1321 KASSERT(ltype == LK_EXCLUSIVE || ltype == LK_SHARED, 1322 ("vn_vget_ino: vp not locked")); 1323 error = vfs_busy(mp, MBF_NOWAIT); 1324 if (error != 0) { 1325 vfs_ref(mp); 1326 VOP_UNLOCK(vp, 0); 1327 error = vfs_busy(mp, 0); 1328 vn_lock(vp, ltype | LK_RETRY); 1329 vfs_rel(mp); 1330 if (error != 0) 1331 return (ENOENT); 1332 if (vp->v_iflag & VI_DOOMED) { 1333 vfs_unbusy(mp); 1334 return (ENOENT); 1335 } 1336 } 1337 VOP_UNLOCK(vp, 0); 1338 error = VFS_VGET(mp, ino, lkflags, rvp); 1339 vfs_unbusy(mp); 1340 vn_lock(vp, ltype | LK_RETRY); 1341 if (vp->v_iflag & VI_DOOMED) { 1342 if (error == 0) 1343 vput(*rvp); 1344 error = ENOENT; 1345 } 1346 return (error); 1347 } 1348 1349 int 1350 vn_rlimit_fsize(const struct vnode *vp, const struct uio *uio, 1351 const struct thread *td) 1352 { 1353 1354 if (vp->v_type != VREG || td == NULL) 1355 return (0); 1356 PROC_LOCK(td->td_proc); 1357 if ((uoff_t)uio->uio_offset + uio->uio_resid > 1358 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 1359 kern_psignal(td->td_proc, SIGXFSZ); 1360 PROC_UNLOCK(td->td_proc); 1361 return (EFBIG); 1362 } 1363 PROC_UNLOCK(td->td_proc); 1364 return (0); 1365 } 1366 1367 int 1368 vn_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, 1369 struct thread *td) 1370 { 1371 struct vnode *vp; 1372 int error, vfslocked; 1373 1374 vp = fp->f_vnode; 1375 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 1376 #ifdef AUDIT 1377 vn_lock(vp, LK_SHARED | LK_RETRY); 1378 AUDIT_ARG_VNODE1(vp); 1379 VOP_UNLOCK(vp, 0); 1380 #endif 1381 error = setfmode(td, active_cred, vp, mode); 1382 VFS_UNLOCK_GIANT(vfslocked); 1383 return (error); 1384 } 1385 1386 int 1387 vn_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, 1388 struct thread *td) 1389 { 1390 struct vnode *vp; 1391 int error, vfslocked; 1392 1393 vp = fp->f_vnode; 1394 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 1395 #ifdef AUDIT 1396 vn_lock(vp, LK_SHARED | LK_RETRY); 1397 AUDIT_ARG_VNODE1(vp); 1398 VOP_UNLOCK(vp, 0); 1399 #endif 1400 error = setfown(td, active_cred, vp, uid, gid); 1401 VFS_UNLOCK_GIANT(vfslocked); 1402 return (error); 1403 } 1404 1405 void 1406 vn_pages_remove(struct vnode *vp, vm_pindex_t start, vm_pindex_t end) 1407 { 1408 vm_object_t object; 1409 1410 if ((object = vp->v_object) == NULL) 1411 return; 1412 VM_OBJECT_LOCK(object); 1413 vm_object_page_remove(object, start, end, 0); 1414 VM_OBJECT_UNLOCK(object); 1415 }
Cache object: db977088942fa0208a8acd969eaecf58
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]