1 /* $NetBSD: msdosfs_vnops.c,v 1.104 2020/06/27 17:29:18 christos Exp $ */ 2 3 /*- 4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 * All rights reserved. 7 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /* 35 * Written by Paul Popelka (paulp@uts.amdahl.com) 36 * 37 * You can do anything you want with this software, just don't say you wrote 38 * it, and don't remove this notice. 39 * 40 * This software is provided "as is". 41 * 42 * The author supplies this software to be publicly redistributed on the 43 * understanding that the author is not responsible for the correct 44 * functioning of this software in any circumstances and is not liable for 45 * any damages caused by this software. 46 * 47 * October 1992 48 */ 49 50 #include <sys/cdefs.h> 51 __KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.104 2020/06/27 17:29:18 christos Exp $"); 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/namei.h> 56 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ 57 #include <sys/kernel.h> 58 #include <sys/file.h> /* define FWRITE ... */ 59 #include <sys/stat.h> 60 #include <sys/buf.h> 61 #include <sys/proc.h> 62 #include <sys/mount.h> 63 #include <sys/vnode.h> 64 #include <sys/signalvar.h> 65 #include <sys/malloc.h> 66 #include <sys/dirent.h> 67 #include <sys/lockf.h> 68 #include <sys/kauth.h> 69 70 #include <miscfs/genfs/genfs.h> 71 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 72 73 #include <uvm/uvm_extern.h> 74 75 #include <fs/msdosfs/bpb.h> 76 #include <fs/msdosfs/direntry.h> 77 #include <fs/msdosfs/denode.h> 78 #include <fs/msdosfs/msdosfsmount.h> 79 #include <fs/msdosfs/fat.h> 80 81 /* 82 * Some general notes: 83 * 84 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 85 * read/written using the vnode for the filesystem. Blocks that represent 86 * the contents of a file are read/written using the vnode for the file 87 * (including directories when they are read/written as files). This 88 * presents problems for the dos filesystem because data that should be in 89 * an inode (if dos had them) resides in the directory itself. Since we 90 * must update directory entries without the benefit of having the vnode 91 * for the directory we must use the vnode for the filesystem. This means 92 * that when a directory is actually read/written (via read, write, or 93 * readdir, or seek) we must use the vnode for the filesystem instead of 94 * the vnode for the directory as would happen in ufs. This is to insure we 95 * retrieve the correct block from the buffer cache since the hash value is 96 * based upon the vnode address and the desired block number. 97 */ 98 99 /* 100 * Create a regular file. On entry the directory to contain the file being 101 * created is locked. We must release before we return. 102 */ 103 int 104 msdosfs_create(void *v) 105 { 106 struct vop_create_v3_args /* { 107 struct vnode *a_dvp; 108 struct vnode **a_vpp; 109 struct componentname *a_cnp; 110 struct vattr *a_vap; 111 } */ *ap = v; 112 struct componentname *cnp = ap->a_cnp; 113 struct denode ndirent; 114 struct denode *dep; 115 struct denode *pdep = VTODE(ap->a_dvp); 116 int error; 117 118 #ifdef MSDOSFS_DEBUG 119 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 120 #endif 121 122 /* 123 * If this is the root directory and there is no space left we 124 * can't do anything. This is because the root directory can not 125 * change size. 126 */ 127 if (pdep->de_StartCluster == MSDOSFSROOT 128 && pdep->de_fndoffset >= pdep->de_FileSize) { 129 error = ENOSPC; 130 goto bad; 131 } 132 133 /* 134 * Create a directory entry for the file, then call createde() to 135 * have it installed. NOTE: DOS files are always executable. We 136 * use the absence of the owner write bit to make the file 137 * readonly. 138 */ 139 memset(&ndirent, 0, sizeof(ndirent)); 140 if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 141 goto bad; 142 143 ndirent.de_Attributes = (ap->a_vap->va_mode & S_IWUSR) ? 144 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 145 ndirent.de_StartCluster = 0; 146 ndirent.de_FileSize = 0; 147 ndirent.de_dev = pdep->de_dev; 148 ndirent.de_devvp = pdep->de_devvp; 149 ndirent.de_pmp = pdep->de_pmp; 150 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 151 DETIMES(&ndirent, NULL, NULL, NULL, pdep->de_pmp->pm_gmtoff); 152 if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) 153 goto bad; 154 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 155 *ap->a_vpp = DETOV(dep); 156 cache_enter(ap->a_dvp, *ap->a_vpp, cnp->cn_nameptr, cnp->cn_namelen, 157 cnp->cn_flags); 158 return (0); 159 160 bad: 161 return (error); 162 } 163 164 int 165 msdosfs_close(void *v) 166 { 167 struct vop_close_args /* { 168 struct vnode *a_vp; 169 int a_fflag; 170 kauth_cred_t a_cred; 171 } */ *ap = v; 172 struct vnode *vp = ap->a_vp; 173 struct denode *dep = VTODE(vp); 174 175 mutex_enter(vp->v_interlock); 176 if (vrefcnt(vp) > 1) 177 DETIMES(dep, NULL, NULL, NULL, dep->de_pmp->pm_gmtoff); 178 mutex_exit(vp->v_interlock); 179 return (0); 180 } 181 182 static int 183 msdosfs_check_possible(struct vnode *vp, struct denode *dep, accmode_t accmode) 184 { 185 186 /* 187 * Disallow write attempts on read-only file systems; 188 * unless the file is a socket, fifo, or a block or 189 * character device resident on the file system. 190 */ 191 if (accmode & VWRITE) { 192 switch (vp->v_type) { 193 case VDIR: 194 case VLNK: 195 case VREG: 196 if (vp->v_mount->mnt_flag & MNT_RDONLY) 197 return (EROFS); 198 default: 199 break; 200 } 201 } 202 203 return 0; 204 } 205 206 static int 207 msdosfs_check_permitted(struct vnode *vp, struct denode *dep, accmode_t accmode, 208 kauth_cred_t cred) 209 { 210 struct msdosfsmount *pmp = dep->de_pmp; 211 mode_t file_mode; 212 213 if ((dep->de_Attributes & ATTR_READONLY) == 0) 214 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 215 else 216 file_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 217 218 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 219 220 return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(accmode, 221 vp->v_type, file_mode), vp, NULL, genfs_can_access(vp, cred, 222 pmp->pm_uid, pmp->pm_gid, file_mode, NULL, accmode)); 223 } 224 225 int 226 msdosfs_access(void *v) 227 { 228 struct vop_access_args /* { 229 struct vnode *a_vp; 230 accmode_t a_accmode; 231 kauth_cred_t a_cred; 232 } */ *ap = v; 233 struct vnode *vp = ap->a_vp; 234 struct denode *dep = VTODE(vp); 235 int error; 236 237 error = msdosfs_check_possible(vp, dep, ap->a_accmode); 238 if (error) 239 return error; 240 241 error = msdosfs_check_permitted(vp, dep, ap->a_accmode, ap->a_cred); 242 243 return error; 244 } 245 246 int 247 msdosfs_getattr(void *v) 248 { 249 struct vop_getattr_args /* { 250 struct vnode *a_vp; 251 struct vattr *a_vap; 252 kauth_cred_t a_cred; 253 } */ *ap = v; 254 struct denode *dep = VTODE(ap->a_vp); 255 struct msdosfsmount *pmp = dep->de_pmp; 256 struct vattr *vap = ap->a_vap; 257 mode_t mode; 258 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 259 ino_t fileid; 260 261 DETIMES(dep, NULL, NULL, NULL, pmp->pm_gmtoff); 262 vap->va_fsid = dep->de_dev; 263 /* 264 * The following computation of the fileid must be the same as that 265 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 266 * doesn't work. 267 */ 268 if (dep->de_Attributes & ATTR_DIRECTORY) { 269 fileid = cntobn(pmp, (ino_t)dep->de_StartCluster) * dirsperblk; 270 if (dep->de_StartCluster == MSDOSFSROOT) 271 fileid = 1; 272 } else { 273 fileid = cntobn(pmp, (ino_t)dep->de_dirclust) * dirsperblk; 274 if (dep->de_dirclust == MSDOSFSROOT) 275 fileid = roottobn(pmp, 0) * dirsperblk; 276 fileid += dep->de_diroffset / sizeof(struct direntry); 277 } 278 vap->va_fileid = fileid; 279 if ((dep->de_Attributes & ATTR_READONLY) == 0) 280 mode = S_IRWXU|S_IRWXG|S_IRWXO; 281 else 282 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 283 vap->va_mode = 284 mode & (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 285 vap->va_uid = pmp->pm_uid; 286 vap->va_gid = pmp->pm_gid; 287 vap->va_nlink = 1; 288 vap->va_rdev = 0; 289 vap->va_size = ap->a_vp->v_size; 290 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, pmp->pm_gmtoff, 291 &vap->va_mtime); 292 if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 293 dos2unixtime(dep->de_ADate, 0, 0, pmp->pm_gmtoff, 294 &vap->va_atime); 295 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, 296 pmp->pm_gmtoff, &vap->va_ctime); 297 } else { 298 vap->va_atime = vap->va_mtime; 299 vap->va_ctime = vap->va_mtime; 300 } 301 vap->va_flags = 0; 302 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) { 303 vap->va_flags |= SF_ARCHIVED; 304 vap->va_mode |= S_ARCH1; 305 } 306 vap->va_gen = 0; 307 vap->va_blocksize = pmp->pm_bpcluster; 308 vap->va_bytes = 309 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 310 vap->va_type = ap->a_vp->v_type; 311 return (0); 312 } 313 314 int 315 msdosfs_setattr(void *v) 316 { 317 struct vop_setattr_args /* { 318 struct vnode *a_vp; 319 struct vattr *a_vap; 320 kauth_cred_t a_cred; 321 } */ *ap = v; 322 int error = 0, de_changed = 0; 323 struct denode *dep = VTODE(ap->a_vp); 324 struct msdosfsmount *pmp = dep->de_pmp; 325 struct vnode *vp = ap->a_vp; 326 struct vattr *vap = ap->a_vap; 327 kauth_cred_t cred = ap->a_cred; 328 329 #ifdef MSDOSFS_DEBUG 330 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 331 ap->a_vp, vap, cred); 332 #endif 333 /* 334 * Note we silently ignore uid or gid changes. 335 */ 336 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 337 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 338 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 339 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) || 340 (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) || 341 (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) { 342 #ifdef MSDOSFS_DEBUG 343 printf("msdosfs_setattr(): returning EINVAL\n"); 344 printf(" va_type %d, va_nlink %x, va_fsid %"PRIx64", va_fileid %llx\n", 345 vap->va_type, vap->va_nlink, vap->va_fsid, 346 (unsigned long long)vap->va_fileid); 347 printf(" va_blocksize %lx, va_rdev %"PRIx64", va_bytes %"PRIx64", va_gen %lx\n", 348 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 349 #endif 350 return (EINVAL); 351 } 352 /* 353 * Silently ignore attributes modifications on directories. 354 */ 355 if (ap->a_vp->v_type == VDIR) 356 return 0; 357 358 if (vap->va_size != VNOVAL) { 359 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 360 error = EROFS; 361 goto bad; 362 } 363 error = detrunc(dep, (u_long)vap->va_size, 0, cred); 364 if (error) 365 goto bad; 366 de_changed = 1; 367 } 368 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 369 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 370 error = EROFS; 371 goto bad; 372 } 373 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, 374 ap->a_vp, NULL, genfs_can_chtimes(ap->a_vp, cred, 375 pmp->pm_uid, vap->va_vaflags)); 376 if (error) 377 goto bad; 378 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 379 vap->va_atime.tv_sec != VNOVAL) 380 unix2dostime(&vap->va_atime, pmp->pm_gmtoff, &dep->de_ADate, NULL, NULL); 381 if (vap->va_mtime.tv_sec != VNOVAL) 382 unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, &dep->de_MDate, &dep->de_MTime, NULL); 383 dep->de_Attributes |= ATTR_ARCHIVE; 384 dep->de_flag |= DE_MODIFIED; 385 de_changed = 1; 386 } 387 /* 388 * DOS files only have the ability to have their writability 389 * attribute set, so we use the owner write bit to set the readonly 390 * attribute. 391 */ 392 if (vap->va_mode != (mode_t)VNOVAL) { 393 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 394 error = EROFS; 395 goto bad; 396 } 397 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, 398 NULL, genfs_can_chflags(vp, cred, pmp->pm_uid, false)); 399 if (error) 400 goto bad; 401 /* We ignore the read and execute bits. */ 402 if (vap->va_mode & S_IWUSR) 403 dep->de_Attributes &= ~ATTR_READONLY; 404 else 405 dep->de_Attributes |= ATTR_READONLY; 406 dep->de_flag |= DE_MODIFIED; 407 de_changed = 1; 408 } 409 /* 410 * Allow the `archived' bit to be toggled. 411 */ 412 if (vap->va_flags != VNOVAL) { 413 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 414 error = EROFS; 415 goto bad; 416 } 417 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, 418 NULL, genfs_can_chflags(vp, cred, pmp->pm_uid, false)); 419 if (error) 420 goto bad; 421 if (vap->va_flags & SF_ARCHIVED) 422 dep->de_Attributes &= ~ATTR_ARCHIVE; 423 else 424 dep->de_Attributes |= ATTR_ARCHIVE; 425 dep->de_flag |= DE_MODIFIED; 426 de_changed = 1; 427 } 428 429 if (de_changed) { 430 VN_KNOTE(vp, NOTE_ATTRIB); 431 error = deupdat(dep, 1); 432 if (error) 433 goto bad; 434 } 435 436 bad: 437 return error; 438 } 439 440 int 441 msdosfs_read(void *v) 442 { 443 struct vop_read_args /* { 444 struct vnode *a_vp; 445 struct uio *a_uio; 446 int a_ioflag; 447 kauth_cred_t a_cred; 448 } */ *ap = v; 449 int error = 0; 450 int64_t diff; 451 int blsize; 452 long n; 453 long on; 454 daddr_t lbn; 455 vsize_t bytelen; 456 struct buf *bp; 457 struct vnode *vp = ap->a_vp; 458 struct denode *dep = VTODE(vp); 459 struct msdosfsmount *pmp = dep->de_pmp; 460 struct uio *uio = ap->a_uio; 461 462 /* 463 * If they didn't ask for any data, then we are done. 464 */ 465 466 if (uio->uio_resid == 0) 467 return (0); 468 if (uio->uio_offset < 0) 469 return (EINVAL); 470 if (uio->uio_offset >= dep->de_FileSize) 471 return (0); 472 473 if (vp->v_type == VREG) { 474 const int advice = IO_ADV_DECODE(ap->a_ioflag); 475 476 while (uio->uio_resid > 0) { 477 bytelen = MIN(dep->de_FileSize - uio->uio_offset, 478 uio->uio_resid); 479 480 if (bytelen == 0) 481 break; 482 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, 483 UBC_READ | UBC_PARTIALOK | UBC_VNODE_FLAGS(vp)); 484 if (error) 485 break; 486 } 487 dep->de_flag |= DE_ACCESS; 488 goto out; 489 } 490 491 /* this loop is only for directories now */ 492 do { 493 lbn = de_cluster(pmp, uio->uio_offset); 494 on = uio->uio_offset & pmp->pm_crbomask; 495 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 496 if (uio->uio_offset >= dep->de_FileSize) { 497 return (0); 498 } 499 /* file size (and hence diff) may be up to 4GB */ 500 diff = dep->de_FileSize - uio->uio_offset; 501 if (diff < n) 502 n = (long) diff; 503 504 /* convert cluster # to sector # */ 505 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 506 if (error) 507 goto bad; 508 509 /* 510 * If we are operating on a directory file then be sure to 511 * do i/o with the vnode for the filesystem instead of the 512 * vnode for the directory. 513 */ 514 error = bread(pmp->pm_devvp, de_bn2kb(pmp, lbn), blsize, 515 0, &bp); 516 if (error) { 517 goto bad; 518 } 519 n = MIN(n, pmp->pm_bpcluster - bp->b_resid); 520 error = uiomove((char *)bp->b_data + on, (int) n, uio); 521 brelse(bp, 0); 522 } while (error == 0 && uio->uio_resid > 0 && n != 0); 523 524 out: 525 if ((ap->a_ioflag & IO_SYNC) == IO_SYNC) { 526 int uerror; 527 528 uerror = deupdat(dep, 1); 529 if (error == 0) 530 error = uerror; 531 } 532 bad: 533 return (error); 534 } 535 536 /* 537 * Write data to a file or directory. 538 */ 539 int 540 msdosfs_write(void *v) 541 { 542 struct vop_write_args /* { 543 struct vnode *a_vp; 544 struct uio *a_uio; 545 int a_ioflag; 546 kauth_cred_t a_cred; 547 } */ *ap = v; 548 int resid, extended = 0; 549 int error = 0; 550 int ioflag = ap->a_ioflag; 551 u_long osize; 552 u_long count; 553 vsize_t bytelen; 554 off_t oldoff; 555 size_t rem; 556 struct uio *uio = ap->a_uio; 557 struct vnode *vp = ap->a_vp; 558 struct denode *dep = VTODE(vp); 559 struct msdosfsmount *pmp = dep->de_pmp; 560 kauth_cred_t cred = ap->a_cred; 561 bool async; 562 563 #ifdef MSDOSFS_DEBUG 564 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 565 vp, uio, ioflag, cred); 566 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 567 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 568 #endif 569 570 switch (vp->v_type) { 571 case VREG: 572 if (ioflag & IO_APPEND) 573 uio->uio_offset = dep->de_FileSize; 574 break; 575 case VDIR: 576 return EISDIR; 577 default: 578 panic("msdosfs_write(): bad file type"); 579 } 580 581 if (uio->uio_offset < 0) 582 return (EINVAL); 583 584 if (uio->uio_resid == 0) 585 return (0); 586 587 /* Don't bother to try to write files larger than the fs limit */ 588 if (uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX) 589 return (EFBIG); 590 591 /* 592 * If the offset we are starting the write at is beyond the end of 593 * the file, then they've done a seek. Unix filesystems allow 594 * files with holes in them, DOS doesn't so we must fill the hole 595 * with zeroed blocks. 596 */ 597 if (uio->uio_offset > dep->de_FileSize) { 598 if ((error = deextend(dep, uio->uio_offset, cred)) != 0) { 599 return (error); 600 } 601 } 602 603 /* 604 * Remember some values in case the write fails. 605 */ 606 async = vp->v_mount->mnt_flag & MNT_ASYNC; 607 resid = uio->uio_resid; 608 osize = dep->de_FileSize; 609 610 /* 611 * If we write beyond the end of the file, extend it to its ultimate 612 * size ahead of the time to hopefully get a contiguous area. 613 */ 614 if (uio->uio_offset + resid > osize) { 615 count = de_clcount(pmp, uio->uio_offset + resid) - 616 de_clcount(pmp, osize); 617 if ((error = extendfile(dep, count, NULL, NULL, 0))) 618 goto errexit; 619 620 dep->de_FileSize = uio->uio_offset + resid; 621 /* hint uvm to not read in extended part */ 622 uvm_vnp_setwritesize(vp, dep->de_FileSize); 623 /* zero out the remainder of the last page */ 624 rem = round_page(dep->de_FileSize) - dep->de_FileSize; 625 if (rem > 0) 626 ubc_zerorange(&vp->v_uobj, (off_t)dep->de_FileSize, 627 rem, UBC_VNODE_FLAGS(vp)); 628 extended = 1; 629 } 630 631 do { 632 oldoff = uio->uio_offset; 633 bytelen = uio->uio_resid; 634 635 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, 636 IO_ADV_DECODE(ioflag), UBC_WRITE | UBC_VNODE_FLAGS(vp)); 637 if (error) 638 break; 639 640 /* 641 * flush what we just wrote if necessary. 642 * XXXUBC simplistic async flushing. 643 */ 644 645 if (!async && oldoff >> 16 != uio->uio_offset >> 16) { 646 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 647 error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16, 648 (uio->uio_offset >> 16) << 16, 649 PGO_CLEANIT | PGO_LAZY); 650 } 651 } while (error == 0 && uio->uio_resid > 0); 652 653 /* set final size */ 654 uvm_vnp_setsize(vp, dep->de_FileSize); 655 if (error == 0 && ioflag & IO_SYNC) { 656 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 657 error = VOP_PUTPAGES(vp, trunc_page(oldoff), 658 round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO); 659 } 660 dep->de_flag |= DE_UPDATE; 661 662 /* 663 * If the write failed and they want us to, truncate the file back 664 * to the size it was before the write was attempted. 665 */ 666 errexit: 667 if (resid > uio->uio_resid) 668 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); 669 if (error) { 670 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 671 uio->uio_offset -= resid - uio->uio_resid; 672 uio->uio_resid = resid; 673 } else if ((ioflag & IO_SYNC) == IO_SYNC) 674 error = deupdat(dep, 1); 675 KASSERT(vp->v_size == dep->de_FileSize); 676 return (error); 677 } 678 679 int 680 msdosfs_update(struct vnode *vp, const struct timespec *acc, 681 const struct timespec *mod, int flags) 682 { 683 struct buf *bp; 684 struct direntry *dirp; 685 struct denode *dep; 686 int error; 687 688 if (vp->v_mount->mnt_flag & MNT_RDONLY) 689 return (0); 690 dep = VTODE(vp); 691 DETIMES(dep, acc, mod, NULL, dep->de_pmp->pm_gmtoff); 692 if ((dep->de_flag & DE_MODIFIED) == 0) 693 return (0); 694 dep->de_flag &= ~DE_MODIFIED; 695 if (dep->de_Attributes & ATTR_DIRECTORY) 696 return (0); 697 if (dep->de_refcnt <= 0) 698 return (0); 699 error = readde(dep, &bp, &dirp); 700 if (error) 701 return (error); 702 DE_EXTERNALIZE(dirp, dep); 703 if (flags & (UPDATE_WAIT|UPDATE_DIROP)) 704 return (bwrite(bp)); 705 else { 706 bdwrite(bp); 707 return (0); 708 } 709 } 710 711 /* 712 * Flush the blocks of a file to disk. 713 * 714 * This function is worthless for vnodes that represent directories. Maybe we 715 * could just do a sync if they try an fsync on a directory file. 716 */ 717 int 718 msdosfs_remove(void *v) 719 { 720 struct vop_remove_v2_args /* { 721 struct vnode *a_dvp; 722 struct vnode *a_vp; 723 struct componentname *a_cnp; 724 } */ *ap = v; 725 struct denode *dep = VTODE(ap->a_vp); 726 struct denode *ddep = VTODE(ap->a_dvp); 727 int error; 728 729 if (ap->a_vp->v_type == VDIR) 730 error = EPERM; 731 else 732 error = removede(ddep, dep); 733 #ifdef MSDOSFS_DEBUG 734 printf("msdosfs_remove(), dep %p, usecount %d\n", 735 dep, vrefcnt(ap->a_vp)); 736 #endif 737 VN_KNOTE(ap->a_vp, NOTE_DELETE); 738 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 739 if (ddep == dep) 740 vrele(ap->a_vp); 741 else 742 vput(ap->a_vp); /* causes msdosfs_inactive() to be called 743 * via vrele() */ 744 745 return (error); 746 } 747 748 /* 749 * Renames on files require moving the denode to a new hash queue since the 750 * denode's location is used to compute which hash queue to put the file 751 * in. Unless it is a rename in place. For example "mv a b". 752 * 753 * What follows is the basic algorithm: 754 * 755 * if (file move) { 756 * if (dest file exists) { 757 * remove dest file 758 * } 759 * if (dest and src in same directory) { 760 * rewrite name in existing directory slot 761 * } else { 762 * write new entry in dest directory 763 * update offset and dirclust in denode 764 * move denode to new hash chain 765 * clear old directory entry 766 * } 767 * } else { 768 * directory move 769 * if (dest directory exists) { 770 * if (dest is not empty) { 771 * return ENOTEMPTY 772 * } 773 * remove dest directory 774 * } 775 * if (dest and src in same directory) { 776 * rewrite name in existing entry 777 * } else { 778 * be sure dest is not a child of src directory 779 * write entry in dest directory 780 * update "." and ".." in moved directory 781 * update offset and dirclust in denode 782 * move denode to new hash chain 783 * clear old directory entry for moved directory 784 * } 785 * } 786 * 787 * On entry: 788 * source's parent directory is unlocked 789 * source file or directory is unlocked 790 * destination's parent directory is locked 791 * destination file or directory is locked if it exists 792 * 793 * On exit: 794 * all denodes should be released 795 * 796 * Notes: 797 * I'm not sure how the memory containing the pathnames pointed at by the 798 * componentname structures is freed, there may be some memory bleeding 799 * for each rename done. 800 * 801 * --More-- Notes: 802 * This routine needs help. badly. 803 */ 804 int 805 msdosfs_rename(void *v) 806 { 807 struct vop_rename_args /* { 808 struct vnode *a_fdvp; 809 struct vnode *a_fvp; 810 struct componentname *a_fcnp; 811 struct vnode *a_tdvp; 812 struct vnode *a_tvp; 813 struct componentname *a_tcnp; 814 } */ *ap = v; 815 struct vnode *tvp = ap->a_tvp; 816 struct vnode *tdvp = ap->a_tdvp; 817 struct vnode *fvp = ap->a_fvp; 818 struct vnode *fdvp = ap->a_fdvp; 819 struct componentname *tcnp = ap->a_tcnp; 820 struct componentname *fcnp = ap->a_fcnp; 821 struct denode *ip, *xp, *dp, *zp; 822 u_char toname[12], oldname[12]; 823 u_long from_diroffset, to_diroffset; 824 u_char to_count; 825 int doingdirectory = 0, newparent = 0; 826 int error; 827 u_long cn; 828 daddr_t bn; 829 struct msdosfsmount *pmp; 830 struct direntry *dotdotp; 831 struct buf *bp; 832 833 pmp = VFSTOMSDOSFS(fdvp->v_mount); 834 835 /* 836 * Check for cross-device rename. 837 */ 838 if ((fvp->v_mount != tdvp->v_mount) || 839 (tvp && (fvp->v_mount != tvp->v_mount))) { 840 error = EXDEV; 841 abortit: 842 VOP_ABORTOP(tdvp, tcnp); 843 if (tdvp == tvp) 844 vrele(tdvp); 845 else 846 vput(tdvp); 847 if (tvp) 848 vput(tvp); 849 VOP_ABORTOP(fdvp, fcnp); 850 vrele(fdvp); 851 vrele(fvp); 852 return (error); 853 } 854 855 /* 856 * If source and dest are the same, do nothing. 857 */ 858 if (tvp == fvp) { 859 error = 0; 860 goto abortit; 861 } 862 863 /* 864 * XXX: This can deadlock since we hold tdvp/tvp locked. 865 * But I'm not going to fix it now. 866 */ 867 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 868 goto abortit; 869 dp = VTODE(fdvp); 870 ip = VTODE(fvp); 871 872 /* 873 * Be sure we are not renaming ".", "..", or an alias of ".". This 874 * leads to a crippled directory tree. It's pretty tough to do a 875 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 876 * doesn't work if the ".." entry is missing. 877 */ 878 if (ip->de_Attributes & ATTR_DIRECTORY) { 879 /* 880 * Avoid ".", "..", and aliases of "." for obvious reasons. 881 */ 882 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 883 dp == ip || 884 (fcnp->cn_flags & ISDOTDOT) || 885 (tcnp->cn_flags & ISDOTDOT) || 886 (ip->de_flag & DE_RENAME)) { 887 VOP_UNLOCK(fvp); 888 error = EINVAL; 889 goto abortit; 890 } 891 ip->de_flag |= DE_RENAME; 892 doingdirectory++; 893 } 894 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 895 896 /* 897 * When the target exists, both the directory 898 * and target vnodes are returned locked. 899 */ 900 dp = VTODE(tdvp); 901 xp = tvp ? VTODE(tvp) : NULL; 902 /* 903 * Remember direntry place to use for destination 904 */ 905 to_diroffset = dp->de_fndoffset; 906 to_count = dp->de_fndcnt; 907 908 /* 909 * If ".." must be changed (ie the directory gets a new 910 * parent) then the source directory must not be in the 911 * directory hierarchy above the target, as this would 912 * orphan everything below the source directory. Also 913 * the user must have write permission in the source so 914 * as to be able to change "..". We must repeat the call 915 * to namei, as the parent directory is unlocked by the 916 * call to doscheckpath(). 917 */ 918 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 919 VOP_UNLOCK(fvp); 920 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 921 newparent = 1; 922 923 if (doingdirectory && newparent) { 924 if (error) /* write access check above */ 925 goto tdvpbad; 926 if (xp != NULL) 927 vput(tvp); 928 tvp = NULL; 929 /* 930 * doscheckpath() vput()'s tdvp (dp == VTODE(tdvp)), 931 * so we have to get an extra ref to it first, and 932 * because it's been unlocked we need to do a relookup 933 * afterwards in case tvp has changed. 934 */ 935 vref(tdvp); 936 if ((error = doscheckpath(ip, dp)) != 0) 937 goto bad; 938 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 939 if ((error = relookup(tdvp, &tvp, tcnp, 0)) != 0) { 940 VOP_UNLOCK(tdvp); 941 goto bad; 942 } 943 dp = VTODE(tdvp); 944 xp = tvp ? VTODE(tvp) : NULL; 945 } 946 947 if (xp != NULL) { 948 /* 949 * Target must be empty if a directory and have no links 950 * to it. Also, ensure source and target are compatible 951 * (both directories, or both not directories). 952 */ 953 if (xp->de_Attributes & ATTR_DIRECTORY) { 954 if (!dosdirempty(xp)) { 955 error = ENOTEMPTY; 956 goto tdvpbad; 957 } 958 if (!doingdirectory) { 959 error = ENOTDIR; 960 goto tdvpbad; 961 } 962 } else if (doingdirectory) { 963 error = EISDIR; 964 goto tdvpbad; 965 } 966 if ((error = removede(dp, xp)) != 0) 967 goto tdvpbad; 968 VN_KNOTE(tdvp, NOTE_WRITE); 969 VN_KNOTE(tvp, NOTE_DELETE); 970 cache_purge(tvp); 971 vput(tvp); 972 tvp = NULL; 973 xp = NULL; 974 } 975 976 /* 977 * Convert the filename in tcnp into a dos filename. We copy this 978 * into the denode and directory entry for the destination 979 * file/directory. 980 */ 981 if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0) { 982 goto abortit; 983 } 984 985 /* 986 * Since from wasn't locked at various places above, 987 * have to do a relookup here. 988 */ 989 fcnp->cn_flags &= ~MODMASK; 990 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 991 VOP_UNLOCK(tdvp); 992 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 993 if ((error = relookup(fdvp, &fvp, fcnp, 0))) { 994 VOP_UNLOCK(fdvp); 995 vrele(ap->a_fvp); 996 vrele(tdvp); 997 return (error); 998 } 999 if (fvp == NULL) { 1000 /* 1001 * From name has disappeared. 1002 */ 1003 if (doingdirectory) 1004 panic("rename: lost dir entry"); 1005 vput(fdvp); 1006 vrele(ap->a_fvp); 1007 vrele(tdvp); 1008 return 0; 1009 } 1010 VOP_UNLOCK(fdvp); 1011 xp = VTODE(fvp); 1012 zp = VTODE(fdvp); 1013 from_diroffset = zp->de_fndoffset; 1014 1015 /* 1016 * Ensure that the directory entry still exists and has not 1017 * changed till now. If the source is a file the entry may 1018 * have been unlinked or renamed. In either case there is 1019 * no further work to be done. If the source is a directory 1020 * then it cannot have been rmdir'ed or renamed; this is 1021 * prohibited by the DE_RENAME flag. 1022 */ 1023 if (xp != ip) { 1024 if (doingdirectory) 1025 panic("rename: lost dir entry"); 1026 vrele(ap->a_fvp); 1027 xp = NULL; 1028 } else { 1029 vrele(fvp); 1030 xp = NULL; 1031 1032 /* 1033 * First write a new entry in the destination 1034 * directory and mark the entry in the source directory 1035 * as deleted. Then move the denode to the correct hash 1036 * chain for its new location in the filesystem. And, if 1037 * we moved a directory, then update its .. entry to point 1038 * to the new parent directory. 1039 */ 1040 memcpy(oldname, ip->de_Name, 11); 1041 memcpy(ip->de_Name, toname, 11); /* update denode */ 1042 dp->de_fndoffset = to_diroffset; 1043 dp->de_fndcnt = to_count; 1044 error = createde(ip, dp, (struct denode **)0, tcnp); 1045 if (error) { 1046 memcpy(ip->de_Name, oldname, 11); 1047 VOP_UNLOCK(fvp); 1048 goto bad; 1049 } 1050 ip->de_refcnt++; 1051 zp->de_fndoffset = from_diroffset; 1052 if ((error = removede(zp, ip)) != 0) { 1053 /* XXX should really panic here, fs is corrupt */ 1054 VOP_UNLOCK(fvp); 1055 goto bad; 1056 } 1057 cache_purge(fvp); 1058 if (!doingdirectory) { 1059 struct denode_key old_key = ip->de_key; 1060 struct denode_key new_key = ip->de_key; 1061 1062 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1063 &new_key.dk_dirclust, 0); 1064 if (error) { 1065 /* XXX should really panic here, fs is corrupt */ 1066 VOP_UNLOCK(fvp); 1067 goto bad; 1068 } 1069 new_key.dk_diroffset = to_diroffset; 1070 if (new_key.dk_dirclust != MSDOSFSROOT) 1071 new_key.dk_diroffset &= pmp->pm_crbomask; 1072 vcache_rekey_enter(pmp->pm_mountp, fvp, &old_key, 1073 sizeof(old_key), &new_key, sizeof(new_key)); 1074 ip->de_key = new_key; 1075 vcache_rekey_exit(pmp->pm_mountp, fvp, &old_key, 1076 sizeof(old_key), &ip->de_key, sizeof(ip->de_key)); 1077 } 1078 } 1079 1080 /* 1081 * If we moved a directory to a new parent directory, then we must 1082 * fixup the ".." entry in the moved directory. 1083 */ 1084 if (doingdirectory && newparent) { 1085 cn = ip->de_StartCluster; 1086 if (cn == MSDOSFSROOT) { 1087 /* this should never happen */ 1088 panic("msdosfs_rename: updating .. in root directory?"); 1089 } else 1090 bn = cntobn(pmp, cn); 1091 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), 1092 pmp->pm_bpcluster, B_MODIFY, &bp); 1093 if (error) { 1094 /* XXX should really panic here, fs is corrupt */ 1095 VOP_UNLOCK(fvp); 1096 goto bad; 1097 } 1098 dotdotp = (struct direntry *)bp->b_data + 1; 1099 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1100 if (FAT32(pmp)) { 1101 putushort(dotdotp->deHighClust, 1102 dp->de_StartCluster >> 16); 1103 } else { 1104 putushort(dotdotp->deHighClust, 0); 1105 } 1106 if ((error = bwrite(bp)) != 0) { 1107 /* XXX should really panic here, fs is corrupt */ 1108 VOP_UNLOCK(fvp); 1109 goto bad; 1110 } 1111 } 1112 1113 VN_KNOTE(fvp, NOTE_RENAME); 1114 VOP_UNLOCK(fvp); 1115 bad: 1116 if (tvp) 1117 vput(tvp); 1118 vrele(tdvp); 1119 ip->de_flag &= ~DE_RENAME; 1120 vrele(fdvp); 1121 vrele(fvp); 1122 return (error); 1123 1124 /* XXX: uuuh */ 1125 tdvpbad: 1126 VOP_UNLOCK(tdvp); 1127 goto bad; 1128 } 1129 1130 static const struct { 1131 struct direntry dot; 1132 struct direntry dotdot; 1133 } dosdirtemplate = { 1134 { ". ", " ", /* the . entry */ 1135 ATTR_DIRECTORY, /* file attribute */ 1136 0, /* reserved */ 1137 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1138 { 0, 0 }, /* access date */ 1139 { 0, 0 }, /* high bits of start cluster */ 1140 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1141 { 0, 0 }, /* startcluster */ 1142 { 0, 0, 0, 0 } /* filesize */ 1143 }, 1144 { ".. ", " ", /* the .. entry */ 1145 ATTR_DIRECTORY, /* file attribute */ 1146 0, /* reserved */ 1147 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1148 { 0, 0 }, /* access date */ 1149 { 0, 0 }, /* high bits of start cluster */ 1150 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1151 { 0, 0 }, /* startcluster */ 1152 { 0, 0, 0, 0 } /* filesize */ 1153 } 1154 }; 1155 1156 int 1157 msdosfs_mkdir(void *v) 1158 { 1159 struct vop_mkdir_v3_args /* { 1160 struct vnode *a_dvp; 1161 struvt vnode **a_vpp; 1162 struvt componentname *a_cnp; 1163 struct vattr *a_vap; 1164 } */ *ap = v; 1165 struct componentname *cnp = ap->a_cnp; 1166 struct denode ndirent; 1167 struct denode *dep; 1168 struct denode *pdep = VTODE(ap->a_dvp); 1169 int error; 1170 int bn; 1171 u_long newcluster, pcl; 1172 daddr_t lbn; 1173 struct direntry *denp; 1174 struct msdosfsmount *pmp = pdep->de_pmp; 1175 struct buf *bp; 1176 int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; 1177 1178 /* 1179 * If this is the root directory and there is no space left we 1180 * can't do anything. This is because the root directory can not 1181 * change size. 1182 */ 1183 if (pdep->de_StartCluster == MSDOSFSROOT 1184 && pdep->de_fndoffset >= pdep->de_FileSize) { 1185 error = ENOSPC; 1186 goto bad2; 1187 } 1188 1189 /* 1190 * Allocate a cluster to hold the about to be created directory. 1191 */ 1192 error = clusteralloc(pmp, 0, 1, &newcluster, NULL); 1193 if (error) 1194 goto bad2; 1195 1196 memset(&ndirent, 0, sizeof(ndirent)); 1197 ndirent.de_pmp = pmp; 1198 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1199 DETIMES(&ndirent, NULL, NULL, NULL, pmp->pm_gmtoff); 1200 1201 /* 1202 * Now fill the cluster with the "." and ".." entries. And write 1203 * the cluster to disk. This way it is there for the parent 1204 * directory to be pointing at if there were a crash. 1205 */ 1206 bn = cntobn(pmp, newcluster); 1207 lbn = de_bn2kb(pmp, bn); 1208 /* always succeeds */ 1209 bp = getblk(pmp->pm_devvp, lbn, pmp->pm_bpcluster, 0, 0); 1210 memset(bp->b_data, 0, pmp->pm_bpcluster); 1211 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1212 denp = (struct direntry *)bp->b_data; 1213 putushort(denp[0].deStartCluster, newcluster); 1214 putushort(denp[0].deCDate, ndirent.de_CDate); 1215 putushort(denp[0].deCTime, ndirent.de_CTime); 1216 denp[0].deCHundredth = ndirent.de_CHun; 1217 putushort(denp[0].deADate, ndirent.de_ADate); 1218 putushort(denp[0].deMDate, ndirent.de_MDate); 1219 putushort(denp[0].deMTime, ndirent.de_MTime); 1220 pcl = pdep->de_StartCluster; 1221 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1222 pcl = 0; 1223 putushort(denp[1].deStartCluster, pcl); 1224 putushort(denp[1].deCDate, ndirent.de_CDate); 1225 putushort(denp[1].deCTime, ndirent.de_CTime); 1226 denp[1].deCHundredth = ndirent.de_CHun; 1227 putushort(denp[1].deADate, ndirent.de_ADate); 1228 putushort(denp[1].deMDate, ndirent.de_MDate); 1229 putushort(denp[1].deMTime, ndirent.de_MTime); 1230 if (FAT32(pmp)) { 1231 putushort(denp[0].deHighClust, newcluster >> 16); 1232 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1233 } else { 1234 putushort(denp[0].deHighClust, 0); 1235 putushort(denp[1].deHighClust, 0); 1236 } 1237 1238 if (async) 1239 bdwrite(bp); 1240 else if ((error = bwrite(bp)) != 0) 1241 goto bad; 1242 1243 /* 1244 * Now build up a directory entry pointing to the newly allocated 1245 * cluster. This will be written to an empty slot in the parent 1246 * directory. 1247 */ 1248 if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 1249 goto bad; 1250 1251 ndirent.de_Attributes = ATTR_DIRECTORY; 1252 ndirent.de_StartCluster = newcluster; 1253 ndirent.de_FileSize = 0; 1254 ndirent.de_dev = pdep->de_dev; 1255 ndirent.de_devvp = pdep->de_devvp; 1256 if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) 1257 goto bad; 1258 VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1259 *ap->a_vpp = DETOV(dep); 1260 return (0); 1261 1262 bad: 1263 clusterfree(pmp, newcluster, NULL); 1264 bad2: 1265 return (error); 1266 } 1267 1268 int 1269 msdosfs_rmdir(void *v) 1270 { 1271 struct vop_rmdir_v2_args /* { 1272 struct vnode *a_dvp; 1273 struct vnode *a_vp; 1274 struct componentname *a_cnp; 1275 } */ *ap = v; 1276 struct vnode *vp = ap->a_vp; 1277 struct vnode *dvp = ap->a_dvp; 1278 struct componentname *cnp = ap->a_cnp; 1279 struct denode *ip, *dp; 1280 int error; 1281 1282 ip = VTODE(vp); 1283 dp = VTODE(dvp); 1284 /* 1285 * No rmdir "." please. 1286 */ 1287 if (dp == ip) { 1288 vrele(vp); 1289 return (EINVAL); 1290 } 1291 /* 1292 * Verify the directory is empty (and valid). 1293 * (Rmdir ".." won't be valid since 1294 * ".." will contain a reference to 1295 * the current directory and thus be 1296 * non-empty.) 1297 */ 1298 error = 0; 1299 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1300 error = ENOTEMPTY; 1301 goto out; 1302 } 1303 /* 1304 * Delete the entry from the directory. For dos filesystems this 1305 * gets rid of the directory entry on disk, the in memory copy 1306 * still exists but the de_refcnt is <= 0. This prevents it from 1307 * being found by deget(). When the vput() on dep is done we give 1308 * up access and eventually msdosfs_reclaim() will be called which 1309 * will remove it from the denode cache. 1310 */ 1311 if ((error = removede(dp, ip)) != 0) 1312 goto out; 1313 /* 1314 * This is where we decrement the link count in the parent 1315 * directory. Since dos filesystems don't do this we just purge 1316 * the name cache and let go of the parent directory denode. 1317 */ 1318 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1319 cache_purge(dvp); 1320 /* 1321 * Truncate the directory that is being deleted. 1322 */ 1323 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1324 cache_purge(vp); 1325 out: 1326 VN_KNOTE(vp, NOTE_DELETE); 1327 vput(vp); 1328 return (error); 1329 } 1330 1331 int 1332 msdosfs_readdir(void *v) 1333 { 1334 struct vop_readdir_args /* { 1335 struct vnode *a_vp; 1336 struct uio *a_uio; 1337 kauth_cred_t a_cred; 1338 int *a_eofflag; 1339 off_t **a_cookies; 1340 int *a_ncookies; 1341 } */ *ap = v; 1342 int error = 0; 1343 int diff; 1344 long n; 1345 int blsize; 1346 long on; 1347 long lost; 1348 long count; 1349 u_long cn; 1350 ino_t fileno; 1351 u_long dirsperblk; 1352 long bias = 0; 1353 daddr_t bn, lbn; 1354 struct buf *bp; 1355 struct denode *dep = VTODE(ap->a_vp); 1356 struct msdosfsmount *pmp = dep->de_pmp; 1357 struct direntry *dentp; 1358 struct dirent *dirbuf; 1359 struct uio *uio = ap->a_uio; 1360 off_t *cookies = NULL; 1361 int ncookies = 0, nc = 0; 1362 off_t offset, uio_off; 1363 int chksum = -1; 1364 uint16_t namlen; 1365 1366 #ifdef MSDOSFS_DEBUG 1367 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1368 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1369 #endif 1370 1371 /* 1372 * msdosfs_readdir() won't operate properly on regular files since 1373 * it does i/o only with the filesystem vnode, and hence can 1374 * retrieve the wrong block from the buffer cache for a plain file. 1375 * So, fail attempts to readdir() on a plain file. 1376 */ 1377 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1378 return (ENOTDIR); 1379 1380 /* 1381 * If the user buffer is smaller than the size of one dos directory 1382 * entry or the file offset is not a multiple of the size of a 1383 * directory entry, then we fail the read. 1384 */ 1385 count = uio->uio_resid & ~(sizeof(struct direntry) - 1); 1386 offset = uio->uio_offset; 1387 if (count < sizeof(struct direntry) || 1388 (offset & (sizeof(struct direntry) - 1))) 1389 return (EINVAL); 1390 lost = uio->uio_resid - count; 1391 uio->uio_resid = count; 1392 uio_off = uio->uio_offset; 1393 1394 1395 /* Allocate a temporary dirent buffer. */ 1396 dirbuf = malloc(sizeof(struct dirent), M_MSDOSFSTMP, M_WAITOK | M_ZERO); 1397 1398 if (ap->a_ncookies) { 1399 nc = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 1400 cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK); 1401 *ap->a_cookies = cookies; 1402 } 1403 1404 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1405 1406 /* 1407 * If they are reading from the root directory then, we simulate 1408 * the . and .. entries since these don't exist in the root 1409 * directory. We also set the offset bias to make up for having to 1410 * simulate these entries. By this I mean that at file offset 64 we 1411 * read the first entry in the root directory that lives on disk. 1412 */ 1413 if (dep->de_StartCluster == MSDOSFSROOT 1414 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1415 #if 0 1416 printf("msdosfs_readdir(): going after . or .. in root dir, " 1417 "offset %" PRIu64 "\n", offset); 1418 #endif 1419 bias = 2 * sizeof(struct direntry); 1420 if (offset < bias) { 1421 for (n = (int)offset / sizeof(struct direntry); 1422 n < 2; n++) { 1423 if (FAT32(pmp)) 1424 dirbuf->d_fileno = cntobn(pmp, 1425 (ino_t)pmp->pm_rootdirblk) 1426 * dirsperblk; 1427 else 1428 dirbuf->d_fileno = 1; 1429 dirbuf->d_type = DT_DIR; 1430 switch (n) { 1431 case 0: 1432 dirbuf->d_namlen = 1; 1433 strlcpy(dirbuf->d_name, ".", 1434 sizeof(dirbuf->d_name)); 1435 break; 1436 case 1: 1437 dirbuf->d_namlen = 2; 1438 strlcpy(dirbuf->d_name, "..", 1439 sizeof(dirbuf->d_name)); 1440 break; 1441 } 1442 dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); 1443 if (uio->uio_resid < dirbuf->d_reclen) 1444 goto out; 1445 error = uiomove(dirbuf, dirbuf->d_reclen, uio); 1446 if (error) 1447 goto out; 1448 offset += sizeof(struct direntry); 1449 uio_off = offset; 1450 if (cookies) { 1451 *cookies++ = offset; 1452 ncookies++; 1453 if (ncookies >= nc) 1454 goto out; 1455 } 1456 } 1457 } 1458 } 1459 1460 while (uio->uio_resid > 0) { 1461 lbn = de_cluster(pmp, offset - bias); 1462 on = (offset - bias) & pmp->pm_crbomask; 1463 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 1464 diff = dep->de_FileSize - (offset - bias); 1465 if (diff <= 0) 1466 break; 1467 n = MIN(n, diff); 1468 if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) 1469 break; 1470 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, 1471 0, &bp); 1472 if (error) { 1473 goto bad; 1474 } 1475 n = MIN(n, blsize - bp->b_resid); 1476 1477 /* 1478 * Convert from dos directory entries to fs-independent 1479 * directory entries. 1480 */ 1481 for (dentp = (struct direntry *)((char *)bp->b_data + on); 1482 (char *)dentp < (char *)bp->b_data + on + n; 1483 dentp++, offset += sizeof(struct direntry)) { 1484 #if 0 1485 1486 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1487 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1488 #endif 1489 /* 1490 * If this is an unused entry, we can stop. 1491 */ 1492 if (dentp->deName[0] == SLOT_EMPTY) { 1493 brelse(bp, 0); 1494 goto out; 1495 } 1496 /* 1497 * Skip deleted entries. 1498 */ 1499 if (dentp->deName[0] == SLOT_DELETED) { 1500 chksum = -1; 1501 continue; 1502 } 1503 1504 /* 1505 * Handle Win95 long directory entries 1506 */ 1507 if (dentp->deAttributes == ATTR_WIN95) { 1508 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1509 continue; 1510 chksum = win2unixfn((struct winentry *)dentp, 1511 dirbuf, chksum, &namlen, 1512 pmp->pm_flags & MSDOSFSMNT_UTF8); 1513 if (chksum != -1) 1514 dirbuf->d_namlen = namlen; 1515 continue; 1516 } 1517 1518 /* 1519 * Skip volume labels 1520 */ 1521 if (dentp->deAttributes & ATTR_VOLUME) { 1522 chksum = -1; 1523 continue; 1524 } 1525 /* 1526 * This computation of d_fileno must match 1527 * the computation of va_fileid in 1528 * msdosfs_getattr. 1529 */ 1530 if (dentp->deAttributes & ATTR_DIRECTORY) { 1531 fileno = getushort(dentp->deStartCluster); 1532 if (FAT32(pmp)) 1533 fileno |= ((ino_t)getushort(dentp->deHighClust)) << 16; 1534 /* if this is the root directory */ 1535 if (fileno == MSDOSFSROOT) 1536 if (FAT32(pmp)) 1537 fileno = cntobn(pmp, 1538 (ino_t)pmp->pm_rootdirblk) 1539 * dirsperblk; 1540 else 1541 fileno = 1; 1542 else 1543 fileno = cntobn(pmp, fileno) * dirsperblk; 1544 dirbuf->d_fileno = fileno; 1545 dirbuf->d_type = DT_DIR; 1546 } else { 1547 dirbuf->d_fileno = 1548 offset / sizeof(struct direntry); 1549 dirbuf->d_type = DT_REG; 1550 } 1551 if (chksum != winChksum(dentp->deName)) 1552 dirbuf->d_namlen = dos2unixfn(dentp->deName, 1553 (u_char *)dirbuf->d_name, 1554 pmp->pm_flags & MSDOSFSMNT_SHORTNAME); 1555 else 1556 dirbuf->d_name[dirbuf->d_namlen] = 0; 1557 namlen = dirbuf->d_namlen; 1558 chksum = -1; 1559 dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); 1560 if (uio->uio_resid < dirbuf->d_reclen) { 1561 brelse(bp, 0); 1562 goto out; 1563 } 1564 error = uiomove(dirbuf, dirbuf->d_reclen, uio); 1565 if (error) { 1566 brelse(bp, 0); 1567 goto out; 1568 } 1569 uio_off = offset + sizeof(struct direntry); 1570 if (cookies) { 1571 *cookies++ = offset + sizeof(struct direntry); 1572 ncookies++; 1573 if (ncookies >= nc) { 1574 brelse(bp, 0); 1575 goto out; 1576 } 1577 } 1578 } 1579 brelse(bp, 0); 1580 } 1581 1582 out: 1583 uio->uio_offset = uio_off; 1584 uio->uio_resid += lost; 1585 if (dep->de_FileSize - (offset - bias) <= 0) 1586 *ap->a_eofflag = 1; 1587 else 1588 *ap->a_eofflag = 0; 1589 1590 if (ap->a_ncookies) { 1591 if (error) { 1592 free(*ap->a_cookies, M_TEMP); 1593 *ap->a_ncookies = 0; 1594 *ap->a_cookies = NULL; 1595 } else 1596 *ap->a_ncookies = ncookies; 1597 } 1598 1599 bad: 1600 free(dirbuf, M_MSDOSFSTMP); 1601 return (error); 1602 } 1603 1604 /* 1605 * vp - address of vnode file the file 1606 * bn - which cluster we are interested in mapping to a filesystem block number. 1607 * vpp - returns the vnode for the block special file holding the filesystem 1608 * containing the file of interest 1609 * bnp - address of where to return the filesystem relative block number 1610 */ 1611 int 1612 msdosfs_bmap(void *v) 1613 { 1614 struct vop_bmap_args /* { 1615 struct vnode *a_vp; 1616 daddr_t a_bn; 1617 struct vnode **a_vpp; 1618 daddr_t *a_bnp; 1619 int *a_runp; 1620 } */ *ap = v; 1621 struct denode *dep = VTODE(ap->a_vp); 1622 int run, maxrun; 1623 daddr_t runbn; 1624 int status; 1625 1626 if (ap->a_vpp != NULL) 1627 *ap->a_vpp = dep->de_devvp; 1628 if (ap->a_bnp == NULL) 1629 return (0); 1630 status = pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0); 1631 1632 /* 1633 * From FreeBSD: 1634 * A little kludgy, but we loop calling pcbmap until we 1635 * reach the end of the contiguous piece, or reach MAXPHYS. 1636 * Since it reduces disk I/Os, the "wasted" CPU is put to 1637 * good use (4 to 5 fold sequential read I/O improvement on USB 1638 * drives). 1639 */ 1640 if (ap->a_runp != NULL) { 1641 /* taken from ufs_bmap */ 1642 maxrun = ulmin(MAXPHYS / dep->de_pmp->pm_bpcluster - 1, 1643 dep->de_pmp->pm_maxcluster - ap->a_bn); 1644 for (run = 1; run <= maxrun; run++) { 1645 if (pcbmap(dep, ap->a_bn + run, &runbn, NULL, NULL) 1646 != 0 || runbn != 1647 *ap->a_bnp + de_cn2bn(dep->de_pmp, run)) 1648 break; 1649 } 1650 *ap->a_runp = run - 1; 1651 } 1652 1653 /* 1654 * We need to scale *ap->a_bnp by sector_size/DEV_BSIZE 1655 */ 1656 *ap->a_bnp = de_bn2kb(dep->de_pmp, *ap->a_bnp); 1657 return status; 1658 } 1659 1660 int 1661 msdosfs_strategy(void *v) 1662 { 1663 struct vop_strategy_args /* { 1664 struct vnode *a_vp; 1665 struct buf *a_bp; 1666 } */ *ap = v; 1667 struct vnode *vp = ap->a_vp; 1668 struct buf *bp = ap->a_bp; 1669 struct denode *dep = VTODE(bp->b_vp); 1670 int error = 0; 1671 1672 if (vp->v_type == VBLK || vp->v_type == VCHR) 1673 panic("msdosfs_strategy: spec"); 1674 /* 1675 * If we don't already know the filesystem relative block number 1676 * then get it using pcbmap(). If pcbmap() returns the block 1677 * number as -1 then we've got a hole in the file. DOS filesystems 1678 * don't allow files with holes, so we shouldn't ever see this. 1679 */ 1680 if (bp->b_blkno == bp->b_lblkno) { 1681 error = pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno), 1682 &bp->b_blkno, 0, 0); 1683 if (error) 1684 bp->b_blkno = -1; 1685 if (bp->b_blkno == -1) 1686 clrbuf(bp); 1687 else 1688 bp->b_blkno = de_bn2kb(dep->de_pmp, bp->b_blkno); 1689 } 1690 if (bp->b_blkno == -1) { 1691 biodone(bp); 1692 return (error); 1693 } 1694 1695 /* 1696 * Read/write the block from/to the disk that contains the desired 1697 * file block. 1698 */ 1699 1700 vp = dep->de_devvp; 1701 return (VOP_STRATEGY(vp, bp)); 1702 } 1703 1704 int 1705 msdosfs_print(void *v) 1706 { 1707 struct vop_print_args /* { 1708 struct vnode *vp; 1709 } */ *ap = v; 1710 struct denode *dep = VTODE(ap->a_vp); 1711 1712 printf( 1713 "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld ", 1714 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1715 printf(" dev %llu, %llu ", (unsigned long long)major(dep->de_dev), 1716 (unsigned long long)minor(dep->de_dev)); 1717 printf("\n"); 1718 return (0); 1719 } 1720 1721 int 1722 msdosfs_advlock(void *v) 1723 { 1724 struct vop_advlock_args /* { 1725 struct vnode *a_vp; 1726 void *a_id; 1727 int a_op; 1728 struct flock *a_fl; 1729 int a_flags; 1730 } */ *ap = v; 1731 struct denode *dep = VTODE(ap->a_vp); 1732 1733 return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize); 1734 } 1735 1736 int 1737 msdosfs_pathconf(void *v) 1738 { 1739 struct vop_pathconf_args /* { 1740 struct vnode *a_vp; 1741 int a_name; 1742 register_t *a_retval; 1743 } */ *ap = v; 1744 1745 switch (ap->a_name) { 1746 case _PC_LINK_MAX: 1747 *ap->a_retval = 1; 1748 return (0); 1749 case _PC_NAME_MAX: 1750 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 1751 return (0); 1752 case _PC_PATH_MAX: 1753 *ap->a_retval = PATH_MAX; 1754 return (0); 1755 case _PC_CHOWN_RESTRICTED: 1756 *ap->a_retval = 1; 1757 return (0); 1758 case _PC_NO_TRUNC: 1759 *ap->a_retval = 1; 1760 return (0); 1761 case _PC_SYNC_IO: 1762 *ap->a_retval = 1; 1763 return (0); 1764 case _PC_FILESIZEBITS: 1765 *ap->a_retval = 32; 1766 return (0); 1767 default: 1768 return genfs_pathconf(ap); 1769 } 1770 /* NOTREACHED */ 1771 } 1772 1773 int 1774 msdosfs_fsync(void *v) 1775 { 1776 struct vop_fsync_args /* { 1777 struct vnode *a_vp; 1778 kauth_cred_t a_cred; 1779 int a_flags; 1780 off_t offlo; 1781 off_t offhi; 1782 } */ *ap = v; 1783 struct vnode *vp = ap->a_vp; 1784 int wait; 1785 int error; 1786 1787 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1788 error = vflushbuf(vp, ap->a_flags); 1789 if (error == 0 && (ap->a_flags & FSYNC_DATAONLY) == 0) 1790 error = msdosfs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1791 1792 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1793 struct denode *dep = VTODE(vp); 1794 struct vnode *devvp = dep->de_devvp; 1795 1796 int l = 0; 1797 error = VOP_IOCTL(devvp, DIOCCACHESYNC, &l, FWRITE, 1798 curlwp->l_cred); 1799 } 1800 1801 return (error); 1802 } 1803 1804 void 1805 msdosfs_detimes(struct denode *dep, const struct timespec *acc, 1806 const struct timespec *mod, const struct timespec *cre, int gmtoff) 1807 { 1808 struct timespec *ts = NULL, tsb; 1809 1810 KASSERT(dep->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS)); 1811 /* XXX just call getnanotime early and use result if needed? */ 1812 dep->de_flag |= DE_MODIFIED; 1813 if (dep->de_flag & DE_UPDATE) { 1814 if (mod == NULL) { 1815 getnanotime(&tsb); 1816 mod = ts = &tsb; 1817 } 1818 unix2dostime(mod, gmtoff, &dep->de_MDate, &dep->de_MTime, NULL); 1819 dep->de_Attributes |= ATTR_ARCHIVE; 1820 } 1821 if ((dep->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0) { 1822 if (dep->de_flag & DE_ACCESS) { 1823 if (acc == NULL) 1824 acc = ts == NULL ? 1825 (getnanotime(&tsb), ts = &tsb) : ts; 1826 unix2dostime(acc, gmtoff, &dep->de_ADate, NULL, NULL); 1827 } 1828 if (dep->de_flag & DE_CREATE) { 1829 if (cre == NULL) 1830 cre = ts == NULL ? 1831 (getnanotime(&tsb), ts = &tsb) : ts; 1832 unix2dostime(cre, gmtoff, &dep->de_CDate, 1833 &dep->de_CTime, &dep->de_CHun); 1834 } 1835 } 1836 1837 dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); 1838 } 1839 1840 /* Global vfs data structures for msdosfs */ 1841 int (**msdosfs_vnodeop_p)(void *); 1842 const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { 1843 { &vop_default_desc, vn_default_error }, 1844 { &vop_lookup_desc, msdosfs_lookup }, /* lookup */ 1845 { &vop_create_desc, msdosfs_create }, /* create */ 1846 { &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */ 1847 { &vop_open_desc, genfs_nullop }, /* open */ 1848 { &vop_close_desc, msdosfs_close }, /* close */ 1849 { &vop_access_desc, msdosfs_access }, /* access */ 1850 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 1851 { &vop_getattr_desc, msdosfs_getattr }, /* getattr */ 1852 { &vop_setattr_desc, msdosfs_setattr }, /* setattr */ 1853 { &vop_read_desc, msdosfs_read }, /* read */ 1854 { &vop_write_desc, msdosfs_write }, /* write */ 1855 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 1856 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 1857 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 1858 { &vop_ioctl_desc, msdosfs_ioctl }, /* ioctl */ 1859 { &vop_poll_desc, msdosfs_poll }, /* poll */ 1860 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1861 { &vop_revoke_desc, msdosfs_revoke }, /* revoke */ 1862 { &vop_mmap_desc, msdosfs_mmap }, /* mmap */ 1863 { &vop_fsync_desc, msdosfs_fsync }, /* fsync */ 1864 { &vop_seek_desc, msdosfs_seek }, /* seek */ 1865 { &vop_remove_desc, msdosfs_remove }, /* remove */ 1866 { &vop_link_desc, genfs_eopnotsupp }, /* link */ 1867 { &vop_rename_desc, msdosfs_rename }, /* rename */ 1868 { &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */ 1869 { &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */ 1870 { &vop_symlink_desc, genfs_eopnotsupp }, /* symlink */ 1871 { &vop_readdir_desc, msdosfs_readdir }, /* readdir */ 1872 { &vop_readlink_desc, genfs_einval }, /* readlink */ 1873 { &vop_abortop_desc, msdosfs_abortop }, /* abortop */ 1874 { &vop_inactive_desc, msdosfs_inactive }, /* inactive */ 1875 { &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */ 1876 { &vop_lock_desc, genfs_lock }, /* lock */ 1877 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 1878 { &vop_bmap_desc, msdosfs_bmap }, /* bmap */ 1879 { &vop_strategy_desc, msdosfs_strategy }, /* strategy */ 1880 { &vop_print_desc, msdosfs_print }, /* print */ 1881 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 1882 { &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */ 1883 { &vop_advlock_desc, msdosfs_advlock }, /* advlock */ 1884 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1885 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1886 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1887 { NULL, NULL } 1888 }; 1889 const struct vnodeopv_desc msdosfs_vnodeop_opv_desc = 1890 { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; 1891