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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_vnops.c
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1 /* $NetBSD: vfs_vnops.c,v 1.129.2.1 2007/01/06 13:22:04 bouyer Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vfs_vnops.c 8.14 (Berkeley) 6/15/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: vfs_vnops.c,v 1.129.2.1 2007/01/06 13:22:04 bouyer Exp $"); 41 42 #include "fs_union.h" 43 #include "veriexec.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/file.h> 49 #include <sys/stat.h> 50 #include <sys/buf.h> 51 #include <sys/proc.h> 52 #include <sys/malloc.h> 53 #include <sys/mount.h> 54 #include <sys/namei.h> 55 #include <sys/vnode.h> 56 #include <sys/ioctl.h> 57 #include <sys/tty.h> 58 #include <sys/poll.h> 59 #include <sys/kauth.h> 60 #include <sys/syslog.h> 61 62 #include <miscfs/specfs/specdev.h> 63 64 #include <uvm/uvm_extern.h> 65 #include <uvm/uvm_readahead.h> 66 67 #ifdef UNION 68 #include <fs/union/union.h> 69 #endif 70 71 #if defined(LKM) || defined(UNION) 72 int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct lwp *); 73 #endif 74 75 #if NVERIEXEC > 0 76 #include <sys/verified_exec.h> 77 #endif /* NVERIEXEC > 0 */ 78 79 static int vn_read(struct file *fp, off_t *offset, struct uio *uio, 80 kauth_cred_t cred, int flags); 81 static int vn_write(struct file *fp, off_t *offset, struct uio *uio, 82 kauth_cred_t cred, int flags); 83 static int vn_closefile(struct file *fp, struct lwp *l); 84 static int vn_poll(struct file *fp, int events, struct lwp *l); 85 static int vn_fcntl(struct file *fp, u_int com, void *data, struct lwp *l); 86 static int vn_statfile(struct file *fp, struct stat *sb, struct lwp *l); 87 static int vn_ioctl(struct file *fp, u_long com, void *data, struct lwp *l); 88 89 const struct fileops vnops = { 90 vn_read, vn_write, vn_ioctl, vn_fcntl, vn_poll, 91 vn_statfile, vn_closefile, vn_kqfilter 92 }; 93 94 /* 95 * Common code for vnode open operations. 96 * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. 97 */ 98 int 99 vn_open(struct nameidata *ndp, int fmode, int cmode) 100 { 101 struct vnode *vp; 102 struct mount *mp = NULL; /* XXX: GCC */ 103 struct lwp *l = ndp->ni_cnd.cn_lwp; 104 kauth_cred_t cred = l->l_cred; 105 struct vattr va; 106 int error; 107 pathname_t pn = NULL; 108 109 restart: 110 if (fmode & O_CREAT) { 111 ndp->ni_cnd.cn_nameiop = CREATE; 112 ndp->ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF; 113 if ((fmode & O_EXCL) == 0 && 114 ((fmode & O_NOFOLLOW) == 0)) 115 ndp->ni_cnd.cn_flags |= FOLLOW; 116 } else { 117 ndp->ni_cnd.cn_nameiop = LOOKUP; 118 ndp->ni_cnd.cn_flags = LOCKLEAF; 119 if ((fmode & O_NOFOLLOW) == 0) 120 ndp->ni_cnd.cn_flags |= FOLLOW; 121 } 122 #if NVERIEXEC > 0 123 error = pathname_get(ndp->ni_dirp, ndp->ni_segflg, &pn); 124 if (error) 125 goto bad2; 126 ndp->ni_dirp = pathname_path(pn); 127 ndp->ni_segflg = UIO_SYSSPACE; 128 #endif /* NVERIEXEC > 0 */ 129 error = namei(ndp); 130 if (error) 131 goto bad2; 132 133 vp = ndp->ni_vp; 134 135 #if NVERIEXEC > 0 136 error = veriexec_openchk(l, ndp->ni_vp, ndp->ni_dirp, fmode); 137 if (error) 138 goto bad; 139 #endif /* NVERIEXEC > 0 */ 140 141 if (fmode & O_CREAT) { 142 if (ndp->ni_vp == NULL) { 143 VATTR_NULL(&va); 144 va.va_type = VREG; 145 va.va_mode = cmode; 146 if (fmode & O_EXCL) 147 va.va_vaflags |= VA_EXCLUSIVE; 148 if (vn_start_write(ndp->ni_dvp, &mp, V_NOWAIT) != 0) { 149 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 150 vput(ndp->ni_dvp); 151 if ((error = vn_start_write(NULL, &mp, 152 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 153 goto bad2; 154 goto restart; 155 } 156 VOP_LEASE(ndp->ni_dvp, l, cred, LEASE_WRITE); 157 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, 158 &ndp->ni_cnd, &va); 159 vn_finished_write(mp, 0); 160 if (error) 161 goto bad2; 162 fmode &= ~O_TRUNC; 163 vp = ndp->ni_vp; 164 } else { 165 VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); 166 if (ndp->ni_dvp == ndp->ni_vp) 167 vrele(ndp->ni_dvp); 168 else 169 vput(ndp->ni_dvp); 170 ndp->ni_dvp = NULL; 171 vp = ndp->ni_vp; 172 if (fmode & O_EXCL) { 173 error = EEXIST; 174 goto bad; 175 } 176 fmode &= ~O_CREAT; 177 } 178 } else { 179 vp = ndp->ni_vp; 180 } 181 if (vp->v_type == VSOCK) { 182 error = EOPNOTSUPP; 183 goto bad; 184 } 185 if (ndp->ni_vp->v_type == VLNK) { 186 error = EFTYPE; 187 goto bad; 188 } 189 190 if ((fmode & O_CREAT) == 0) { 191 if (fmode & FREAD) { 192 if ((error = VOP_ACCESS(vp, VREAD, cred, l)) != 0) 193 goto bad; 194 } 195 196 if (fmode & (FWRITE | O_TRUNC)) { 197 if (vp->v_type == VDIR) { 198 error = EISDIR; 199 goto bad; 200 } 201 if ((error = vn_writechk(vp)) != 0 || 202 (error = VOP_ACCESS(vp, VWRITE, cred, l)) != 0) 203 goto bad; 204 } 205 } 206 207 if (fmode & O_TRUNC) { 208 VOP_UNLOCK(vp, 0); /* XXX */ 209 210 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 211 vrele(vp); 212 goto bad2; 213 } 214 VOP_LEASE(vp, l, cred, LEASE_WRITE); 215 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 216 VATTR_NULL(&va); 217 va.va_size = 0; 218 error = VOP_SETATTR(vp, &va, cred, l); 219 vn_finished_write(mp, 0); 220 if (error != 0) 221 goto bad; 222 } 223 if ((error = VOP_OPEN(vp, fmode, cred, l)) != 0) 224 goto bad; 225 if (vp->v_type == VREG && 226 uvn_attach(vp, fmode & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 227 error = EIO; 228 goto bad; 229 } 230 if (fmode & FWRITE) 231 vp->v_writecount++; 232 233 bad: 234 if (error) 235 vput(vp); 236 237 bad2: 238 pathname_put(pn); 239 240 return (error); 241 } 242 243 /* 244 * Check for write permissions on the specified vnode. 245 * Prototype text segments cannot be written. 246 */ 247 int 248 vn_writechk(struct vnode *vp) 249 { 250 251 /* 252 * If the vnode is in use as a process's text, 253 * we can't allow writing. 254 */ 255 if (vp->v_flag & VTEXT) 256 return (ETXTBSY); 257 return (0); 258 } 259 260 /* 261 * Mark a vnode as having executable mappings. 262 */ 263 void 264 vn_markexec(struct vnode *vp) 265 { 266 if ((vp->v_flag & VEXECMAP) == 0) { 267 uvmexp.filepages -= vp->v_uobj.uo_npages; 268 uvmexp.execpages += vp->v_uobj.uo_npages; 269 } 270 vp->v_flag |= VEXECMAP; 271 } 272 273 /* 274 * Mark a vnode as being the text of a process. 275 * Fail if the vnode is currently writable. 276 */ 277 int 278 vn_marktext(struct vnode *vp) 279 { 280 281 if (vp->v_writecount != 0) { 282 KASSERT((vp->v_flag & VTEXT) == 0); 283 return (ETXTBSY); 284 } 285 vp->v_flag |= VTEXT; 286 vn_markexec(vp); 287 return (0); 288 } 289 290 /* 291 * Vnode close call 292 * 293 * Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node. 294 */ 295 int 296 vn_close(struct vnode *vp, int flags, kauth_cred_t cred, struct lwp *l) 297 { 298 int error; 299 300 if (flags & FWRITE) 301 vp->v_writecount--; 302 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 303 error = VOP_CLOSE(vp, flags, cred, l); 304 vput(vp); 305 return (error); 306 } 307 308 /* 309 * Package up an I/O request on a vnode into a uio and do it. 310 */ 311 int 312 vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, int len, off_t offset, 313 enum uio_seg segflg, int ioflg, kauth_cred_t cred, size_t *aresid, 314 struct lwp *l) 315 { 316 struct uio auio; 317 struct iovec aiov; 318 struct mount *mp = NULL; 319 int error; 320 321 if ((ioflg & IO_NODELOCKED) == 0) { 322 if (rw == UIO_READ) { 323 vn_lock(vp, LK_SHARED | LK_RETRY); 324 } else /* UIO_WRITE */ { 325 if (vp->v_type != VCHR && 326 (error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) 327 != 0) 328 return (error); 329 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 330 } 331 } 332 auio.uio_iov = &aiov; 333 auio.uio_iovcnt = 1; 334 aiov.iov_base = base; 335 aiov.iov_len = len; 336 auio.uio_resid = len; 337 auio.uio_offset = offset; 338 auio.uio_rw = rw; 339 if (segflg == UIO_SYSSPACE) { 340 UIO_SETUP_SYSSPACE(&auio); 341 } else { 342 auio.uio_vmspace = l->l_proc->p_vmspace; 343 } 344 if (rw == UIO_READ) { 345 error = VOP_READ(vp, &auio, ioflg, cred); 346 } else { 347 error = VOP_WRITE(vp, &auio, ioflg, cred); 348 } 349 if (aresid) 350 *aresid = auio.uio_resid; 351 else 352 if (auio.uio_resid && error == 0) 353 error = EIO; 354 if ((ioflg & IO_NODELOCKED) == 0) { 355 if (rw == UIO_WRITE) 356 vn_finished_write(mp, 0); 357 VOP_UNLOCK(vp, 0); 358 } 359 return (error); 360 } 361 362 int 363 vn_readdir(struct file *fp, char *bf, int segflg, u_int count, int *done, 364 struct lwp *l, off_t **cookies, int *ncookies) 365 { 366 struct vnode *vp = (struct vnode *)fp->f_data; 367 struct iovec aiov; 368 struct uio auio; 369 int error, eofflag; 370 371 /* Limit the size on any kernel buffers used by VOP_READDIR */ 372 count = min(MAXBSIZE, count); 373 374 unionread: 375 if (vp->v_type != VDIR) 376 return (EINVAL); 377 aiov.iov_base = bf; 378 aiov.iov_len = count; 379 auio.uio_iov = &aiov; 380 auio.uio_iovcnt = 1; 381 auio.uio_rw = UIO_READ; 382 if (segflg == UIO_SYSSPACE) { 383 UIO_SETUP_SYSSPACE(&auio); 384 } else { 385 KASSERT(l == curlwp); 386 auio.uio_vmspace = l->l_proc->p_vmspace; 387 } 388 auio.uio_resid = count; 389 vn_lock(vp, LK_SHARED | LK_RETRY); 390 auio.uio_offset = fp->f_offset; 391 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookies, 392 ncookies); 393 fp->f_offset = auio.uio_offset; 394 VOP_UNLOCK(vp, 0); 395 if (error) 396 return (error); 397 398 #if defined(UNION) || defined(LKM) 399 if (count == auio.uio_resid && vn_union_readdir_hook) { 400 struct vnode *ovp = vp; 401 402 error = (*vn_union_readdir_hook)(&vp, fp, l); 403 if (error) 404 return (error); 405 if (vp != ovp) 406 goto unionread; 407 } 408 #endif /* UNION || LKM */ 409 410 if (count == auio.uio_resid && (vp->v_flag & VROOT) && 411 (vp->v_mount->mnt_flag & MNT_UNION)) { 412 struct vnode *tvp = vp; 413 vp = vp->v_mount->mnt_vnodecovered; 414 VREF(vp); 415 fp->f_data = vp; 416 fp->f_offset = 0; 417 vrele(tvp); 418 goto unionread; 419 } 420 *done = count - auio.uio_resid; 421 return error; 422 } 423 424 /* 425 * File table vnode read routine. 426 */ 427 static int 428 vn_read(struct file *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 429 int flags) 430 { 431 struct vnode *vp = (struct vnode *)fp->f_data; 432 int count, error, ioflag; 433 struct lwp *l = curlwp; 434 435 VOP_LEASE(vp, l, cred, LEASE_READ); 436 ioflag = IO_ADV_ENCODE(fp->f_advice); 437 if (fp->f_flag & FNONBLOCK) 438 ioflag |= IO_NDELAY; 439 if ((fp->f_flag & (FFSYNC | FRSYNC)) == (FFSYNC | FRSYNC)) 440 ioflag |= IO_SYNC; 441 if (fp->f_flag & FALTIO) 442 ioflag |= IO_ALTSEMANTICS; 443 if (fp->f_flag & FDIRECT) 444 ioflag |= IO_DIRECT; 445 vn_lock(vp, LK_SHARED | LK_RETRY); 446 uio->uio_offset = *offset; 447 count = uio->uio_resid; 448 error = VOP_READ(vp, uio, ioflag, cred); 449 if (flags & FOF_UPDATE_OFFSET) 450 *offset += count - uio->uio_resid; 451 VOP_UNLOCK(vp, 0); 452 return (error); 453 } 454 455 /* 456 * File table vnode write routine. 457 */ 458 static int 459 vn_write(struct file *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 460 int flags) 461 { 462 struct vnode *vp = (struct vnode *)fp->f_data; 463 struct mount *mp; 464 int count, error, ioflag = IO_UNIT; 465 struct lwp *l = curlwp; 466 467 if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) 468 ioflag |= IO_APPEND; 469 if (fp->f_flag & FNONBLOCK) 470 ioflag |= IO_NDELAY; 471 if (fp->f_flag & FFSYNC || 472 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 473 ioflag |= IO_SYNC; 474 else if (fp->f_flag & FDSYNC) 475 ioflag |= IO_DSYNC; 476 if (fp->f_flag & FALTIO) 477 ioflag |= IO_ALTSEMANTICS; 478 if (fp->f_flag & FDIRECT) 479 ioflag |= IO_DIRECT; 480 mp = NULL; 481 if (vp->v_type != VCHR && 482 (error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 483 return (error); 484 VOP_LEASE(vp, l, cred, LEASE_WRITE); 485 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 486 uio->uio_offset = *offset; 487 count = uio->uio_resid; 488 error = VOP_WRITE(vp, uio, ioflag, cred); 489 if (flags & FOF_UPDATE_OFFSET) { 490 if (ioflag & IO_APPEND) 491 *offset = uio->uio_offset; 492 else 493 *offset += count - uio->uio_resid; 494 } 495 VOP_UNLOCK(vp, 0); 496 vn_finished_write(mp, 0); 497 return (error); 498 } 499 500 /* 501 * File table vnode stat routine. 502 */ 503 static int 504 vn_statfile(struct file *fp, struct stat *sb, struct lwp *l) 505 { 506 struct vnode *vp = (struct vnode *)fp->f_data; 507 508 return vn_stat(vp, sb, l); 509 } 510 511 int 512 vn_stat(struct vnode *vp, struct stat *sb, struct lwp *l) 513 { 514 struct vattr va; 515 int error; 516 mode_t mode; 517 518 error = VOP_GETATTR(vp, &va, l->l_cred, l); 519 if (error) 520 return (error); 521 /* 522 * Copy from vattr table 523 */ 524 sb->st_dev = va.va_fsid; 525 sb->st_ino = va.va_fileid; 526 mode = va.va_mode; 527 switch (vp->v_type) { 528 case VREG: 529 mode |= S_IFREG; 530 break; 531 case VDIR: 532 mode |= S_IFDIR; 533 break; 534 case VBLK: 535 mode |= S_IFBLK; 536 break; 537 case VCHR: 538 mode |= S_IFCHR; 539 break; 540 case VLNK: 541 mode |= S_IFLNK; 542 break; 543 case VSOCK: 544 mode |= S_IFSOCK; 545 break; 546 case VFIFO: 547 mode |= S_IFIFO; 548 break; 549 default: 550 return (EBADF); 551 }; 552 sb->st_mode = mode; 553 sb->st_nlink = va.va_nlink; 554 sb->st_uid = va.va_uid; 555 sb->st_gid = va.va_gid; 556 sb->st_rdev = va.va_rdev; 557 sb->st_size = va.va_size; 558 sb->st_atimespec = va.va_atime; 559 sb->st_mtimespec = va.va_mtime; 560 sb->st_ctimespec = va.va_ctime; 561 sb->st_birthtimespec = va.va_birthtime; 562 sb->st_blksize = va.va_blocksize; 563 sb->st_flags = va.va_flags; 564 sb->st_gen = 0; 565 sb->st_blocks = va.va_bytes / S_BLKSIZE; 566 return (0); 567 } 568 569 /* 570 * File table vnode fcntl routine. 571 */ 572 static int 573 vn_fcntl(struct file *fp, u_int com, void *data, struct lwp *l) 574 { 575 struct vnode *vp = ((struct vnode *)fp->f_data); 576 int error; 577 578 error = VOP_FCNTL(vp, com, data, fp->f_flag, l->l_cred, l); 579 return (error); 580 } 581 582 /* 583 * File table vnode ioctl routine. 584 */ 585 static int 586 vn_ioctl(struct file *fp, u_long com, void *data, struct lwp *l) 587 { 588 struct vnode *vp = ((struct vnode *)fp->f_data); 589 struct proc *p = l->l_proc; 590 struct vattr vattr; 591 int error; 592 593 switch (vp->v_type) { 594 595 case VREG: 596 case VDIR: 597 if (com == FIONREAD) { 598 error = VOP_GETATTR(vp, &vattr, l->l_cred, l); 599 if (error) 600 return (error); 601 *(int *)data = vattr.va_size - fp->f_offset; 602 return (0); 603 } 604 if ((com == FIONWRITE) || (com == FIONSPACE)) { 605 /* 606 * Files don't have send queues, so there never 607 * are any bytes in them, nor is there any 608 * open space in them. 609 */ 610 *(int *)data = 0; 611 return (0); 612 } 613 if (com == FIOGETBMAP) { 614 daddr_t *block; 615 616 if (*(daddr_t *)data < 0) 617 return (EINVAL); 618 block = (daddr_t *)data; 619 return (VOP_BMAP(vp, *block, NULL, block, NULL)); 620 } 621 if (com == OFIOGETBMAP) { 622 daddr_t ibn, obn; 623 624 if (*(int32_t *)data < 0) 625 return (EINVAL); 626 ibn = (daddr_t)*(int32_t *)data; 627 error = VOP_BMAP(vp, ibn, NULL, &obn, NULL); 628 *(int32_t *)data = (int32_t)obn; 629 return error; 630 } 631 if (com == FIONBIO || com == FIOASYNC) /* XXX */ 632 return (0); /* XXX */ 633 /* fall into ... */ 634 case VFIFO: 635 case VCHR: 636 case VBLK: 637 error = VOP_IOCTL(vp, com, data, fp->f_flag, 638 l->l_cred, l); 639 if (error == 0 && com == TIOCSCTTY) { 640 if (p->p_session->s_ttyvp) 641 vrele(p->p_session->s_ttyvp); 642 p->p_session->s_ttyvp = vp; 643 VREF(vp); 644 } 645 return (error); 646 647 default: 648 return (EPASSTHROUGH); 649 } 650 } 651 652 /* 653 * File table vnode poll routine. 654 */ 655 static int 656 vn_poll(struct file *fp, int events, struct lwp *l) 657 { 658 659 return (VOP_POLL(((struct vnode *)fp->f_data), events, l)); 660 } 661 662 /* 663 * File table vnode kqfilter routine. 664 */ 665 int 666 vn_kqfilter(struct file *fp, struct knote *kn) 667 { 668 669 return (VOP_KQFILTER((struct vnode *)fp->f_data, kn)); 670 } 671 672 /* 673 * Check that the vnode is still valid, and if so 674 * acquire requested lock. 675 */ 676 int 677 vn_lock(struct vnode *vp, int flags) 678 { 679 int error; 680 681 #if 0 682 KASSERT(vp->v_usecount > 0 || (flags & LK_INTERLOCK) != 0 683 || (vp->v_flag & VONWORKLST) != 0); 684 #endif 685 KASSERT((flags & 686 ~(LK_INTERLOCK|LK_SHARED|LK_EXCLUSIVE|LK_DRAIN|LK_NOWAIT|LK_RETRY| 687 LK_SETRECURSE|LK_CANRECURSE)) 688 == 0); 689 690 do { 691 if ((flags & LK_INTERLOCK) == 0) 692 simple_lock(&vp->v_interlock); 693 if (vp->v_flag & VXLOCK) { 694 if (flags & LK_NOWAIT) { 695 simple_unlock(&vp->v_interlock); 696 return EBUSY; 697 } 698 vp->v_flag |= VXWANT; 699 ltsleep(vp, PINOD | PNORELOCK, 700 "vn_lock", 0, &vp->v_interlock); 701 error = ENOENT; 702 } else { 703 error = VOP_LOCK(vp, 704 (flags & ~LK_RETRY) | LK_INTERLOCK); 705 if (error == 0 || error == EDEADLK || error == EBUSY) 706 return (error); 707 } 708 flags &= ~LK_INTERLOCK; 709 } while (flags & LK_RETRY); 710 return (error); 711 } 712 713 /* 714 * File table vnode close routine. 715 */ 716 static int 717 vn_closefile(struct file *fp, struct lwp *l) 718 { 719 720 return (vn_close(((struct vnode *)fp->f_data), fp->f_flag, 721 fp->f_cred, l)); 722 } 723 724 /* 725 * Enable LK_CANRECURSE on lock. Return prior status. 726 */ 727 u_int 728 vn_setrecurse(struct vnode *vp) 729 { 730 struct lock *lkp = &vp->v_lock; 731 u_int retval = lkp->lk_flags & LK_CANRECURSE; 732 733 lkp->lk_flags |= LK_CANRECURSE; 734 return retval; 735 } 736 737 /* 738 * Called when done with locksetrecurse. 739 */ 740 void 741 vn_restorerecurse(struct vnode *vp, u_int flags) 742 { 743 struct lock *lkp = &vp->v_lock; 744 745 lkp->lk_flags &= ~LK_CANRECURSE; 746 lkp->lk_flags |= flags; 747 } 748 749 int 750 vn_cow_establish(struct vnode *vp, 751 int (*func)(void *, struct buf *), void *cookie) 752 { 753 int s; 754 struct spec_cow_entry *e; 755 756 MALLOC(e, struct spec_cow_entry *, sizeof(struct spec_cow_entry), 757 M_DEVBUF, M_WAITOK); 758 e->ce_func = func; 759 e->ce_cookie = cookie; 760 761 SPEC_COW_LOCK(vp->v_specinfo, s); 762 vp->v_spec_cow_req++; 763 while (vp->v_spec_cow_count > 0) 764 ltsleep(&vp->v_spec_cow_req, PRIBIO, "cowlist", 0, 765 &vp->v_spec_cow_slock); 766 767 SLIST_INSERT_HEAD(&vp->v_spec_cow_head, e, ce_list); 768 769 vp->v_spec_cow_req--; 770 if (vp->v_spec_cow_req == 0) 771 wakeup(&vp->v_spec_cow_req); 772 SPEC_COW_UNLOCK(vp->v_specinfo, s); 773 774 return 0; 775 } 776 777 int 778 vn_cow_disestablish(struct vnode *vp, 779 int (*func)(void *, struct buf *), void *cookie) 780 { 781 int s; 782 struct spec_cow_entry *e; 783 784 SPEC_COW_LOCK(vp->v_specinfo, s); 785 vp->v_spec_cow_req++; 786 while (vp->v_spec_cow_count > 0) 787 ltsleep(&vp->v_spec_cow_req, PRIBIO, "cowlist", 0, 788 &vp->v_spec_cow_slock); 789 790 SLIST_FOREACH(e, &vp->v_spec_cow_head, ce_list) 791 if (e->ce_func == func && e->ce_cookie == cookie) { 792 SLIST_REMOVE(&vp->v_spec_cow_head, e, 793 spec_cow_entry, ce_list); 794 FREE(e, M_DEVBUF); 795 break; 796 } 797 798 vp->v_spec_cow_req--; 799 if (vp->v_spec_cow_req == 0) 800 wakeup(&vp->v_spec_cow_req); 801 SPEC_COW_UNLOCK(vp->v_specinfo, s); 802 803 return e ? 0 : EINVAL; 804 } 805 806 /* 807 * Simplified in-kernel wrapper calls for extended attribute access. 808 * Both calls pass in a NULL credential, authorizing a "kernel" access. 809 * Set IO_NODELOCKED in ioflg if the vnode is already locked. 810 */ 811 int 812 vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, 813 const char *attrname, size_t *buflen, void *bf, struct lwp *l) 814 { 815 struct uio auio; 816 struct iovec aiov; 817 int error; 818 819 aiov.iov_len = *buflen; 820 aiov.iov_base = bf; 821 822 auio.uio_iov = &aiov; 823 auio.uio_iovcnt = 1; 824 auio.uio_rw = UIO_READ; 825 auio.uio_offset = 0; 826 auio.uio_resid = *buflen; 827 UIO_SETUP_SYSSPACE(&auio); 828 829 if ((ioflg & IO_NODELOCKED) == 0) 830 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 831 832 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL, 833 l); 834 835 if ((ioflg & IO_NODELOCKED) == 0) 836 VOP_UNLOCK(vp, 0); 837 838 if (error == 0) 839 *buflen = *buflen - auio.uio_resid; 840 841 return (error); 842 } 843 844 /* 845 * XXX Failure mode if partially written? 846 */ 847 int 848 vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, 849 const char *attrname, size_t buflen, const void *bf, struct lwp *l) 850 { 851 struct uio auio; 852 struct iovec aiov; 853 struct mount *mp = NULL; /* XXX: GCC */ 854 int error; 855 856 aiov.iov_len = buflen; 857 aiov.iov_base = __UNCONST(bf); /* XXXUNCONST kills const */ 858 859 auio.uio_iov = &aiov; 860 auio.uio_iovcnt = 1; 861 auio.uio_rw = UIO_WRITE; 862 auio.uio_offset = 0; 863 auio.uio_resid = buflen; 864 UIO_SETUP_SYSSPACE(&auio); 865 866 if ((ioflg & IO_NODELOCKED) == 0) { 867 if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0) 868 return (error); 869 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 870 } 871 872 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, l); 873 874 if ((ioflg & IO_NODELOCKED) == 0) { 875 vn_finished_write(mp, 0); 876 VOP_UNLOCK(vp, 0); 877 } 878 879 return (error); 880 } 881 882 int 883 vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, 884 const char *attrname, struct lwp *l) 885 { 886 struct mount *mp = NULL; /* XXX: GCC */ 887 int error; 888 889 if ((ioflg & IO_NODELOCKED) == 0) { 890 if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0) 891 return (error); 892 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 893 } 894 895 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL, l); 896 if (error == EOPNOTSUPP) 897 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, 898 NULL, l); 899 900 if ((ioflg & IO_NODELOCKED) == 0) { 901 vn_finished_write(mp, 0); 902 VOP_UNLOCK(vp, 0); 903 } 904 905 return (error); 906 } 907 908 /* 909 * Preparing to start a filesystem write operation. If the operation is 910 * permitted, then we bump the count of operations in progress and 911 * proceed. If a suspend request is in progress, we wait until the 912 * suspension is over, and then proceed. 913 * V_PCATCH adds PCATCH to the tsleep flags. 914 * V_WAIT waits until suspension is over. Otherwise returns EWOULDBLOCK. 915 * V_SLEEPONLY wait, but do not bump the operations count. 916 * V_LOWER this is a lower level operation. No further vnodes should be 917 * locked. Otherwise it is a upper level operation. No vnodes 918 * should be locked. 919 */ 920 int 921 vn_start_write(struct vnode *vp, struct mount **mpp, int flags) 922 { 923 struct mount *mp; 924 int error, mask, prio; 925 926 /* 927 * If a vnode is provided, get and return the mount point that 928 * to which it will write. 929 */ 930 if (vp != NULL) { 931 *mpp = vp->v_mount; 932 } 933 if ((mp = *mpp) == NULL) 934 return (0); 935 mp = mp->mnt_leaf; 936 /* 937 * Check on status of suspension. 938 */ 939 prio = PUSER - 1; 940 if (flags & V_PCATCH) 941 prio |= PCATCH; 942 943 if ((flags & V_LOWER) == 0) 944 mask = IMNT_SUSPEND; 945 else 946 mask = IMNT_SUSPENDLOW; 947 948 while ((mp->mnt_iflag & mask) != 0) { 949 if ((flags & V_WAIT) == 0) 950 return (EWOULDBLOCK); 951 error = tsleep(&mp->mnt_flag, prio, "suspfs", 0); 952 if (error) 953 return (error); 954 } 955 if (flags & V_SLEEPONLY) 956 return (0); 957 simple_lock(&mp->mnt_slock); 958 if ((flags & V_LOWER) == 0) 959 mp->mnt_writeopcountupper++; 960 else 961 mp->mnt_writeopcountlower++; 962 simple_unlock(&mp->mnt_slock); 963 return (0); 964 } 965 966 /* 967 * Filesystem write operation has completed. If we are suspending and this 968 * operation is the last one, notify the suspender that the suspension is 969 * now in effect. 970 */ 971 void 972 vn_finished_write(struct mount *mp, int flags) 973 { 974 if (mp == NULL) 975 return; 976 mp = mp->mnt_leaf; 977 simple_lock(&mp->mnt_slock); 978 if ((flags & V_LOWER) == 0) { 979 mp->mnt_writeopcountupper--; 980 if (mp->mnt_writeopcountupper < 0) 981 printf("vn_finished_write: neg cnt upper=%d\n", 982 mp->mnt_writeopcountupper); 983 if ((mp->mnt_iflag & IMNT_SUSPEND) != 0 && 984 mp->mnt_writeopcountupper <= 0) 985 wakeup(&mp->mnt_writeopcountupper); 986 } else { 987 mp->mnt_writeopcountlower--; 988 if (mp->mnt_writeopcountlower < 0) 989 printf("vn_finished_write: neg cnt lower=%d\n", 990 mp->mnt_writeopcountlower); 991 if ((mp->mnt_iflag & IMNT_SUSPENDLOW) != 0 && 992 mp->mnt_writeopcountupper <= 0) 993 wakeup(&mp->mnt_writeopcountlower); 994 } 995 simple_unlock(&mp->mnt_slock); 996 } 997 998 void 999 vn_ra_allocctx(struct vnode *vp) 1000 { 1001 struct uvm_ractx *ra = NULL; 1002 1003 if (vp->v_type != VREG) { 1004 return; 1005 } 1006 if (vp->v_ractx != NULL) { 1007 return; 1008 } 1009 simple_lock(&vp->v_interlock); 1010 if (vp->v_ractx == NULL) { 1011 simple_unlock(&vp->v_interlock); 1012 ra = uvm_ra_allocctx(); 1013 simple_lock(&vp->v_interlock); 1014 if (ra != NULL && vp->v_ractx == NULL) { 1015 vp->v_ractx = ra; 1016 ra = NULL; 1017 } 1018 } 1019 simple_unlock(&vp->v_interlock); 1020 if (ra != NULL) { 1021 uvm_ra_freectx(ra); 1022 } 1023 }
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