1/* $FreeBSD$ */ 2/* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 3 4/*- 5 * SPDX-License-Identifier: BSD-4-Clause 6 * 7 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 8 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 9 * All rights reserved. 10 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 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. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by TooLs GmbH. 23 * 4. The name of TooLs GmbH may not be used to endorse or promote products 24 * derived from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 32 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 33 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 34 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 35 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37/*- 38 * Written by Paul Popelka (paulp@uts.amdahl.com) 39 * 40 * You can do anything you want with this software, just don't say you wrote 41 * it, and don't remove this notice. 42 * 43 * This software is provided "as is". 44 * 45 * The author supplies this software to be publicly redistributed on the 46 * understanding that the author is not responsible for the correct 47 * functioning of this software in any circumstances and is not liable for 48 * any damages caused by this software. 49 * 50 * October 1992 51 */ 52 53#include <sys/param.h> 54#include <sys/systm.h> 55#include <sys/bio.h> 56#include <sys/buf.h> 57#include <sys/clock.h> 58#include <sys/dirent.h> 59#include <sys/lock.h> 60#include <sys/lockf.h> 61#include <sys/malloc.h> 62#include <sys/mount.h> 63#include <sys/mutex.h> 64#include <sys/namei.h> 65#include <sys/priv.h> 66#include <sys/stat.h> 67#include <sys/sysctl.h> 68#include <sys/unistd.h> 69#include <sys/vmmeter.h> 70#include <sys/vnode.h> 71 72#include <vm/vm.h> 73#include <vm/vm_extern.h> 74#include <vm/vnode_pager.h> 75 76#include <fs/msdosfs/bpb.h> 77#include <fs/msdosfs/direntry.h> 78#include <fs/msdosfs/denode.h> 79#include <fs/msdosfs/fat.h> 80#include <fs/msdosfs/msdosfsmount.h> 81 82/* 83 * Prototypes for MSDOSFS vnode operations 84 */ 85static vop_create_t msdosfs_create; 86static vop_mknod_t msdosfs_mknod; 87static vop_open_t msdosfs_open; 88static vop_close_t msdosfs_close; 89static vop_access_t msdosfs_access; 90static vop_getattr_t msdosfs_getattr; 91static vop_setattr_t msdosfs_setattr; 92static vop_read_t msdosfs_read; 93static vop_write_t msdosfs_write; 94static vop_fsync_t msdosfs_fsync; 95static vop_remove_t msdosfs_remove; 96static vop_link_t msdosfs_link; 97static vop_rename_t msdosfs_rename; 98static vop_mkdir_t msdosfs_mkdir; 99static vop_rmdir_t msdosfs_rmdir; 100static vop_symlink_t msdosfs_symlink; 101static vop_readdir_t msdosfs_readdir; 102static vop_bmap_t msdosfs_bmap; 103static vop_getpages_t msdosfs_getpages; 104static vop_strategy_t msdosfs_strategy; 105static vop_print_t msdosfs_print; 106static vop_pathconf_t msdosfs_pathconf; 107static vop_vptofh_t msdosfs_vptofh; 108 109/* 110 * Some general notes: 111 * 112 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 113 * read/written using the vnode for the filesystem. Blocks that represent 114 * the contents of a file are read/written using the vnode for the file 115 * (including directories when they are read/written as files). This 116 * presents problems for the dos filesystem because data that should be in 117 * an inode (if dos had them) resides in the directory itself. Since we 118 * must update directory entries without the benefit of having the vnode 119 * for the directory we must use the vnode for the filesystem. This means 120 * that when a directory is actually read/written (via read, write, or 121 * readdir, or seek) we must use the vnode for the filesystem instead of 122 * the vnode for the directory as would happen in ufs. This is to insure we 123 * retrieve the correct block from the buffer cache since the hash value is 124 * based upon the vnode address and the desired block number. 125 */ 126 127/* 128 * Create a regular file. On entry the directory to contain the file being 129 * created is locked. We must release before we return. We must also free 130 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 131 * only if the SAVESTART bit in cn_flags is clear on success. 132 */ 133static int 134msdosfs_create(struct vop_create_args *ap) 135{ 136 struct componentname *cnp = ap->a_cnp; 137 struct denode ndirent; 138 struct denode *dep; 139 struct denode *pdep = VTODE(ap->a_dvp); 140 struct timespec ts; 141 int error; 142 143#ifdef MSDOSFS_DEBUG 144 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 145#endif 146 147 /* 148 * If this is the root directory and there is no space left we 149 * can't do anything. This is because the root directory can not 150 * change size. 151 */ 152 if (pdep->de_StartCluster == MSDOSFSROOT 153 && pdep->de_fndoffset >= pdep->de_FileSize) { 154 error = ENOSPC; 155 goto bad; 156 } 157 158 /* 159 * Create a directory entry for the file, then call createde() to 160 * have it installed. NOTE: DOS files are always executable. We 161 * use the absence of the owner write bit to make the file 162 * readonly. 163 */ 164#ifdef DIAGNOSTIC 165 if ((cnp->cn_flags & HASBUF) == 0) 166 panic("msdosfs_create: no name"); 167#endif 168 memset(&ndirent, 0, sizeof(ndirent)); 169 error = uniqdosname(pdep, cnp, ndirent.de_Name); 170 if (error) 171 goto bad; 172 173 ndirent.de_Attributes = ATTR_ARCHIVE; 174 ndirent.de_LowerCase = 0; 175 ndirent.de_StartCluster = 0; 176 ndirent.de_FileSize = 0; 177 ndirent.de_pmp = pdep->de_pmp; 178 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 179 vfs_timestamp(&ts); 180 DETIMES(&ndirent, &ts, &ts, &ts); 181 error = createde(&ndirent, pdep, &dep, cnp); 182 if (error) 183 goto bad; 184 *ap->a_vpp = DETOV(dep); 185 if ((cnp->cn_flags & MAKEENTRY) != 0) 186 cache_enter(ap->a_dvp, *ap->a_vpp, cnp); 187 return (0); 188 189bad: 190 return (error); 191} 192 193static int 194msdosfs_mknod(struct vop_mknod_args *ap) 195{ 196 197 return (EINVAL); 198} 199 200static int 201msdosfs_open(struct vop_open_args *ap) 202{ 203 struct denode *dep = VTODE(ap->a_vp); 204 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 205 return 0; 206} 207 208static int 209msdosfs_close(struct vop_close_args *ap) 210{ 211 struct vnode *vp = ap->a_vp; 212 struct denode *dep = VTODE(vp); 213 struct timespec ts; 214 215 VI_LOCK(vp); 216 if (vp->v_usecount > 1) { 217 vfs_timestamp(&ts); 218 DETIMES(dep, &ts, &ts, &ts); 219 } 220 VI_UNLOCK(vp); 221 return 0; 222} 223 224static int 225msdosfs_access(struct vop_access_args *ap) 226{ 227 struct vnode *vp = ap->a_vp; 228 struct denode *dep = VTODE(ap->a_vp); 229 struct msdosfsmount *pmp = dep->de_pmp; 230 mode_t file_mode; 231 accmode_t accmode = ap->a_accmode; 232 233 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 234 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 235 236 /* 237 * Disallow writing to directories and regular files if the 238 * filesystem is read-only. 239 */ 240 if (accmode & VWRITE) { 241 switch (vp->v_type) { 242 case VREG: 243 case VDIR: 244 if (vp->v_mount->mnt_flag & MNT_RDONLY) 245 return (EROFS); 246 break; 247 default: 248 break; 249 } 250 } 251 252 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 253 ap->a_accmode, ap->a_cred, NULL)); 254} 255 256static int 257msdosfs_getattr(struct vop_getattr_args *ap) 258{ 259 struct denode *dep = VTODE(ap->a_vp); 260 struct msdosfsmount *pmp = dep->de_pmp; 261 struct vattr *vap = ap->a_vap; 262 mode_t mode; 263 struct timespec ts; 264 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 265 uint64_t fileid; 266 267 vfs_timestamp(&ts); 268 DETIMES(dep, &ts, &ts, &ts); 269 vap->va_fsid = dev2udev(pmp->pm_dev); 270 /* 271 * The following computation of the fileid must be the same as that 272 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 273 * doesn't work. 274 */ 275 if (dep->de_Attributes & ATTR_DIRECTORY) { 276 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 277 dirsperblk; 278 if (dep->de_StartCluster == MSDOSFSROOT) 279 fileid = 1; 280 } else { 281 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 282 dirsperblk; 283 if (dep->de_dirclust == MSDOSFSROOT) 284 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 285 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 286 } 287 vap->va_fileid = fileid; 288 289 mode = S_IRWXU|S_IRWXG|S_IRWXO; 290 if (dep->de_Attributes & ATTR_READONLY) 291 mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH); 292 vap->va_mode = mode & 293 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 294 vap->va_uid = pmp->pm_uid; 295 vap->va_gid = pmp->pm_gid; 296 vap->va_nlink = 1; 297 vap->va_rdev = NODEV; 298 vap->va_size = dep->de_FileSize; 299 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 300 vap->va_ctime = vap->va_mtime; 301 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 302 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 303 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 304 0, &vap->va_birthtime); 305 } else { 306 vap->va_atime = vap->va_mtime; 307 vap->va_birthtime.tv_sec = -1; 308 vap->va_birthtime.tv_nsec = 0; 309 } 310 vap->va_flags = 0; 311 if (dep->de_Attributes & ATTR_ARCHIVE) 312 vap->va_flags |= UF_ARCHIVE; 313 if (dep->de_Attributes & ATTR_HIDDEN) 314 vap->va_flags |= UF_HIDDEN; 315 if (dep->de_Attributes & ATTR_READONLY) 316 vap->va_flags |= UF_READONLY; 317 if (dep->de_Attributes & ATTR_SYSTEM) 318 vap->va_flags |= UF_SYSTEM; 319 vap->va_gen = 0; 320 vap->va_blocksize = pmp->pm_bpcluster; 321 vap->va_bytes = 322 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 323 vap->va_type = ap->a_vp->v_type; 324 vap->va_filerev = dep->de_modrev; 325 return (0); 326} 327 328static int 329msdosfs_setattr(struct vop_setattr_args *ap) 330{ 331 struct vnode *vp = ap->a_vp; 332 struct denode *dep = VTODE(ap->a_vp); 333 struct msdosfsmount *pmp = dep->de_pmp; 334 struct vattr *vap = ap->a_vap; 335 struct ucred *cred = ap->a_cred; 336 struct thread *td = curthread; 337 int error = 0; 338 339#ifdef MSDOSFS_DEBUG 340 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 341 ap->a_vp, vap, cred); 342#endif 343 344 /* 345 * Check for unsettable attributes. 346 */ 347 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 348 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 349 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 350 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 351#ifdef MSDOSFS_DEBUG 352 printf("msdosfs_setattr(): returning EINVAL\n"); 353 printf(" va_type %d, va_nlink %llx, va_fsid %llx, va_fileid %llx\n", 354 vap->va_type, (unsigned long long)vap->va_nlink, 355 (unsigned long long)vap->va_fsid, 356 (unsigned long long)vap->va_fileid); 357 printf(" va_blocksize %lx, va_rdev %llx, va_bytes %llx, va_gen %lx\n", 358 vap->va_blocksize, (unsigned long long)vap->va_rdev, 359 (unsigned long long)vap->va_bytes, vap->va_gen); 360 printf(" va_uid %x, va_gid %x\n", 361 vap->va_uid, vap->va_gid); 362#endif 363 return (EINVAL); 364 } 365 366 /* 367 * We don't allow setting attributes on the root directory. 368 * The special case for the root directory is because before 369 * FAT32, the root directory didn't have an entry for itself 370 * (and was otherwise special). With FAT32, the root 371 * directory is not so special, but still doesn't have an 372 * entry for itself. 373 */ 374 if (vp->v_vflag & VV_ROOT) 375 return (EINVAL); 376 377 if (vap->va_flags != VNOVAL) { 378 if (vp->v_mount->mnt_flag & MNT_RDONLY) 379 return (EROFS); 380 if (cred->cr_uid != pmp->pm_uid) { 381 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 382 if (error) 383 return (error); 384 } 385 /* 386 * We are very inconsistent about handling unsupported 387 * attributes. We ignored the access time and the 388 * read and execute bits. We were strict for the other 389 * attributes. 390 */ 391 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY | 392 UF_SYSTEM)) 393 return EOPNOTSUPP; 394 if (vap->va_flags & UF_ARCHIVE) 395 dep->de_Attributes |= ATTR_ARCHIVE; 396 else 397 dep->de_Attributes &= ~ATTR_ARCHIVE; 398 if (vap->va_flags & UF_HIDDEN) 399 dep->de_Attributes |= ATTR_HIDDEN; 400 else 401 dep->de_Attributes &= ~ATTR_HIDDEN; 402 /* We don't allow changing the readonly bit on directories. */ 403 if (vp->v_type != VDIR) { 404 if (vap->va_flags & UF_READONLY) 405 dep->de_Attributes |= ATTR_READONLY; 406 else 407 dep->de_Attributes &= ~ATTR_READONLY; 408 } 409 if (vap->va_flags & UF_SYSTEM) 410 dep->de_Attributes |= ATTR_SYSTEM; 411 else 412 dep->de_Attributes &= ~ATTR_SYSTEM; 413 dep->de_flag |= DE_MODIFIED; 414 } 415 416 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 417 uid_t uid; 418 gid_t gid; 419 420 if (vp->v_mount->mnt_flag & MNT_RDONLY) 421 return (EROFS); 422 uid = vap->va_uid; 423 if (uid == (uid_t)VNOVAL) 424 uid = pmp->pm_uid; 425 gid = vap->va_gid; 426 if (gid == (gid_t)VNOVAL) 427 gid = pmp->pm_gid; 428 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 429 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 430 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 431 if (error) 432 return (error); 433 } 434 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 435 return EINVAL; 436 } 437 438 if (vap->va_size != VNOVAL) { 439 switch (vp->v_type) { 440 case VDIR: 441 return (EISDIR); 442 case VREG: 443 /* 444 * Truncation is only supported for regular files, 445 * Disallow it if the filesystem is read-only. 446 */ 447 if (vp->v_mount->mnt_flag & MNT_RDONLY) 448 return (EROFS); 449 break; 450 default: 451 /* 452 * According to POSIX, the result is unspecified 453 * for file types other than regular files, 454 * directories and shared memory objects. We 455 * don't support any file types except regular 456 * files and directories in this file system, so 457 * this (default) case is unreachable and can do 458 * anything. Keep falling through to detrunc() 459 * for now. 460 */ 461 break; 462 } 463 error = detrunc(dep, vap->va_size, 0, cred); 464 if (error) 465 return error; 466 } 467 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 468 if (vp->v_mount->mnt_flag & MNT_RDONLY) 469 return (EROFS); 470 error = vn_utimes_perm(vp, vap, cred, td); 471 if (error != 0) 472 return (error); 473 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 474 vap->va_atime.tv_sec != VNOVAL) { 475 dep->de_flag &= ~DE_ACCESS; 476 timespec2fattime(&vap->va_atime, 0, 477 &dep->de_ADate, NULL, NULL); 478 } 479 if (vap->va_mtime.tv_sec != VNOVAL) { 480 dep->de_flag &= ~DE_UPDATE; 481 timespec2fattime(&vap->va_mtime, 0, 482 &dep->de_MDate, &dep->de_MTime, NULL); 483 } 484 /* 485 * We don't set the archive bit when modifying the time of 486 * a directory to emulate the Windows/DOS behavior. 487 */ 488 if (vp->v_type != VDIR) 489 dep->de_Attributes |= ATTR_ARCHIVE; 490 dep->de_flag |= DE_MODIFIED; 491 } 492 /* 493 * DOS files only have the ability to have their writability 494 * attribute set, so we use the owner write bit to set the readonly 495 * attribute. 496 */ 497 if (vap->va_mode != (mode_t)VNOVAL) { 498 if (vp->v_mount->mnt_flag & MNT_RDONLY) 499 return (EROFS); 500 if (cred->cr_uid != pmp->pm_uid) { 501 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 502 if (error) 503 return (error); 504 } 505 if (vp->v_type != VDIR) { 506 /* We ignore the read and execute bits. */ 507 if (vap->va_mode & S_IWUSR) 508 dep->de_Attributes &= ~ATTR_READONLY; 509 else 510 dep->de_Attributes |= ATTR_READONLY; 511 dep->de_Attributes |= ATTR_ARCHIVE; 512 dep->de_flag |= DE_MODIFIED; 513 } 514 } 515 return (deupdat(dep, 0)); 516} 517 518static int 519msdosfs_read(struct vop_read_args *ap) 520{ 521 int error = 0; 522 int blsize; 523 int isadir; 524 ssize_t orig_resid; 525 u_int n; 526 u_long diff; 527 u_long on; 528 daddr_t lbn; 529 daddr_t rablock; 530 int rasize; 531 int seqcount; 532 struct buf *bp; 533 struct vnode *vp = ap->a_vp; 534 struct denode *dep = VTODE(vp); 535 struct msdosfsmount *pmp = dep->de_pmp; 536 struct uio *uio = ap->a_uio; 537 538 /* 539 * If they didn't ask for any data, then we are done. 540 */ 541 orig_resid = uio->uio_resid; 542 if (orig_resid == 0) 543 return (0); 544 545 /* 546 * The caller is supposed to ensure that 547 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 548 * We don't need to check for large offsets as in ffs because 549 * dep->de_FileSize <= MSDOSFS_FILESIZE_MAX < OFF_MAX, so large 550 * offsets cannot cause overflow even in theory. 551 */ 552 553 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 554 555 isadir = dep->de_Attributes & ATTR_DIRECTORY; 556 do { 557 if (uio->uio_offset >= dep->de_FileSize) 558 break; 559 lbn = de_cluster(pmp, uio->uio_offset); 560 rablock = lbn + 1; 561 blsize = pmp->pm_bpcluster; 562 on = uio->uio_offset & pmp->pm_crbomask; 563 /* 564 * If we are operating on a directory file then be sure to 565 * do i/o with the vnode for the filesystem instead of the 566 * vnode for the directory. 567 */ 568 if (isadir) { 569 /* convert cluster # to block # */ 570 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 571 if (error == E2BIG) { 572 error = EINVAL; 573 break; 574 } else if (error) 575 break; 576 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 577 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 578 error = bread(vp, lbn, blsize, NOCRED, &bp); 579 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 580 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 581 NOCRED, on + uio->uio_resid, seqcount, 0, &bp); 582 } else if (seqcount > 1) { 583 rasize = blsize; 584 error = breadn(vp, lbn, 585 blsize, &rablock, &rasize, 1, NOCRED, &bp); 586 } else { 587 error = bread(vp, lbn, blsize, NOCRED, &bp); 588 } 589 if (error) { 590 brelse(bp); 591 break; 592 } 593 diff = pmp->pm_bpcluster - on; 594 n = diff > uio->uio_resid ? uio->uio_resid : diff; 595 diff = dep->de_FileSize - uio->uio_offset; 596 if (diff < n) 597 n = diff; 598 diff = blsize - bp->b_resid; 599 if (diff < n) 600 n = diff; 601 error = vn_io_fault_uiomove(bp->b_data + on, (int) n, uio); 602 brelse(bp); 603 } while (error == 0 && uio->uio_resid > 0 && n != 0); 604 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 605 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 606 dep->de_flag |= DE_ACCESS; 607 return (error); 608} 609 610/* 611 * Write data to a file or directory. 612 */ 613static int 614msdosfs_write(struct vop_write_args *ap) 615{ 616 int n; 617 int croffset; 618 ssize_t resid; 619 u_long osize; 620 int error = 0; 621 u_long count; 622 int seqcount; 623 daddr_t bn, lastcn; 624 struct buf *bp; 625 int ioflag = ap->a_ioflag; 626 struct uio *uio = ap->a_uio; 627 struct vnode *vp = ap->a_vp; 628 struct vnode *thisvp; 629 struct denode *dep = VTODE(vp); 630 struct msdosfsmount *pmp = dep->de_pmp; 631 struct ucred *cred = ap->a_cred; 632 633#ifdef MSDOSFS_DEBUG 634 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 635 vp, uio, ioflag, cred); 636 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 637 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 638#endif 639 640 switch (vp->v_type) { 641 case VREG: 642 if (ioflag & IO_APPEND) 643 uio->uio_offset = dep->de_FileSize; 644 thisvp = vp; 645 break; 646 case VDIR: 647 return EISDIR; 648 default: 649 panic("msdosfs_write(): bad file type"); 650 } 651 652 /* 653 * This is needed (unlike in ffs_write()) because we extend the 654 * file outside of the loop but we don't want to extend the file 655 * for writes of 0 bytes. 656 */ 657 if (uio->uio_resid == 0) 658 return (0); 659 660 /* 661 * The caller is supposed to ensure that 662 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 663 */ 664 if ((uoff_t)uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX) 665 return (EFBIG); 666 667 /* 668 * If they've exceeded their filesize limit, tell them about it. 669 */ 670 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 671 return (EFBIG); 672 673 /* 674 * If the offset we are starting the write at is beyond the end of 675 * the file, then they've done a seek. Unix filesystems allow 676 * files with holes in them, DOS doesn't so we must fill the hole 677 * with zeroed blocks. 678 */ 679 if (uio->uio_offset > dep->de_FileSize) { 680 error = deextend(dep, uio->uio_offset, cred); 681 if (error) 682 return (error); 683 } 684 685 /* 686 * Remember some values in case the write fails. 687 */ 688 resid = uio->uio_resid; 689 osize = dep->de_FileSize; 690 691 /* 692 * If we write beyond the end of the file, extend it to its ultimate 693 * size ahead of the time to hopefully get a contiguous area. 694 */ 695 if (uio->uio_offset + resid > osize) { 696 count = de_clcount(pmp, uio->uio_offset + resid) - 697 de_clcount(pmp, osize); 698 error = extendfile(dep, count, NULL, NULL, 0); 699 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 700 goto errexit; 701 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 702 } else 703 lastcn = de_clcount(pmp, osize) - 1; 704 705 seqcount = ioflag >> IO_SEQSHIFT; 706 do { 707 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 708 error = ENOSPC; 709 break; 710 } 711 712 croffset = uio->uio_offset & pmp->pm_crbomask; 713 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 714 if (uio->uio_offset + n > dep->de_FileSize) { 715 dep->de_FileSize = uio->uio_offset + n; 716 /* The object size needs to be set before buffer is allocated */ 717 vnode_pager_setsize(vp, dep->de_FileSize); 718 } 719 720 bn = de_cluster(pmp, uio->uio_offset); 721 if ((uio->uio_offset & pmp->pm_crbomask) == 0 722 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 723 > de_cluster(pmp, uio->uio_offset) 724 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 725 /* 726 * If either the whole cluster gets written, 727 * or we write the cluster from its start beyond EOF, 728 * then no need to read data from disk. 729 */ 730 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 731 /* 732 * This call to vfs_bio_clrbuf() ensures that 733 * even if vn_io_fault_uiomove() below faults, 734 * garbage from the newly instantiated buffer 735 * is not exposed to the userspace via mmap(). 736 */ 737 vfs_bio_clrbuf(bp); 738 /* 739 * Do the bmap now, since pcbmap needs buffers 740 * for the FAT table. (see msdosfs_strategy) 741 */ 742 if (bp->b_blkno == bp->b_lblkno) { 743 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 744 if (error) 745 bp->b_blkno = -1; 746 else 747 bp->b_blkno = bn; 748 } 749 if (bp->b_blkno == -1) { 750 brelse(bp); 751 if (!error) 752 error = EIO; /* XXX */ 753 break; 754 } 755 } else { 756 /* 757 * The block we need to write into exists, so read it in. 758 */ 759 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 760 if (error) { 761 brelse(bp); 762 break; 763 } 764 } 765 766 /* 767 * Should these vnode_pager_* functions be done on dir 768 * files? 769 */ 770 771 /* 772 * Copy the data from user space into the buf header. 773 */ 774 error = vn_io_fault_uiomove(bp->b_data + croffset, n, uio); 775 if (error) { 776 brelse(bp); 777 break; 778 } 779 780 /* Prepare for clustered writes in some else clauses. */ 781 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 782 bp->b_flags |= B_CLUSTEROK; 783 784 /* 785 * If IO_SYNC, then each buffer is written synchronously. 786 * Otherwise, if we have a severe page deficiency then 787 * write the buffer asynchronously. Otherwise, if on a 788 * cluster boundary then write the buffer asynchronously, 789 * combining it with contiguous clusters if permitted and 790 * possible, since we don't expect more writes into this 791 * buffer soon. Otherwise, do a delayed write because we 792 * expect more writes into this buffer soon. 793 */ 794 if (ioflag & IO_SYNC) 795 (void)bwrite(bp); 796 else if (vm_page_count_severe() || buf_dirty_count_severe()) 797 bawrite(bp); 798 else if (n + croffset == pmp->pm_bpcluster) { 799 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 800 cluster_write(vp, bp, dep->de_FileSize, 801 seqcount, 0); 802 else 803 bawrite(bp); 804 } else 805 bdwrite(bp); 806 dep->de_flag |= DE_UPDATE; 807 } while (error == 0 && uio->uio_resid > 0); 808 809 /* 810 * If the write failed and they want us to, truncate the file back 811 * to the size it was before the write was attempted. 812 */ 813errexit: 814 if (error) { 815 if (ioflag & IO_UNIT) { 816 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 817 uio->uio_offset -= resid - uio->uio_resid; 818 uio->uio_resid = resid; 819 } else { 820 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 821 if (uio->uio_resid != resid) 822 error = 0; 823 } 824 } else if (ioflag & IO_SYNC) 825 error = deupdat(dep, 1); 826 return (error); 827} 828 829/* 830 * Flush the blocks of a file to disk. 831 */ 832static int 833msdosfs_fsync(struct vop_fsync_args *ap) 834{ 835 struct vnode *devvp; 836 int allerror, error; 837 838 vop_stdfsync(ap); 839 840 /* 841 * If the syncing request comes from fsync(2), sync the entire 842 * FAT and any other metadata that happens to be on devvp. We 843 * need this mainly for the FAT. We write the FAT sloppily, and 844 * syncing it all now is the best we can easily do to get all 845 * directory entries associated with the file (not just the file) 846 * fully synced. The other metadata includes critical metadata 847 * for all directory entries, but only in the MNT_ASYNC case. We 848 * will soon sync all metadata in the file's directory entry. 849 * Non-critical metadata for associated directory entries only 850 * gets synced accidentally, as in most file systems. 851 */ 852 if (ap->a_waitfor != MNT_NOWAIT) { 853 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 854 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 855 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 856 VOP_UNLOCK(devvp, 0); 857 } else 858 allerror = 0; 859 860 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor != MNT_NOWAIT); 861 if (allerror == 0) 862 allerror = error; 863 return (allerror); 864} 865 866static int 867msdosfs_remove(struct vop_remove_args *ap) 868{ 869 struct denode *dep = VTODE(ap->a_vp); 870 struct denode *ddep = VTODE(ap->a_dvp); 871 int error; 872 873 if (ap->a_vp->v_type == VDIR) 874 error = EPERM; 875 else 876 error = removede(ddep, dep); 877#ifdef MSDOSFS_DEBUG 878 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 879#endif 880 return (error); 881} 882 883/* 884 * DOS filesystems don't know what links are. 885 */ 886static int 887msdosfs_link(struct vop_link_args *ap) 888{ 889 return (EOPNOTSUPP); 890} 891 892/* 893 * Renames on files require moving the denode to a new hash queue since the 894 * denode's location is used to compute which hash queue to put the file 895 * in. Unless it is a rename in place. For example "mv a b". 896 * 897 * What follows is the basic algorithm: 898 * 899 * if (file move) { 900 * if (dest file exists) { 901 * remove dest file 902 * } 903 * if (dest and src in same directory) { 904 * rewrite name in existing directory slot 905 * } else { 906 * write new entry in dest directory 907 * update offset and dirclust in denode 908 * move denode to new hash chain 909 * clear old directory entry 910 * } 911 * } else { 912 * directory move 913 * if (dest directory exists) { 914 * if (dest is not empty) { 915 * return ENOTEMPTY 916 * } 917 * remove dest directory 918 * } 919 * if (dest and src in same directory) { 920 * rewrite name in existing entry 921 * } else { 922 * be sure dest is not a child of src directory 923 * write entry in dest directory 924 * update "." and ".." in moved directory 925 * clear old directory entry for moved directory 926 * } 927 * } 928 * 929 * On entry: 930 * source's parent directory is unlocked 931 * source file or directory is unlocked 932 * destination's parent directory is locked 933 * destination file or directory is locked if it exists 934 * 935 * On exit: 936 * all denodes should be released 937 */ 938static int 939msdosfs_rename(struct vop_rename_args *ap) 940{ 941 struct vnode *tdvp = ap->a_tdvp; 942 struct vnode *fvp = ap->a_fvp; 943 struct vnode *fdvp = ap->a_fdvp; 944 struct vnode *tvp = ap->a_tvp; 945 struct componentname *tcnp = ap->a_tcnp; 946 struct componentname *fcnp = ap->a_fcnp; 947 struct denode *ip, *xp, *dp, *zp; 948 u_char toname[12], oldname[11]; 949 u_long from_diroffset, to_diroffset; 950 u_char to_count; 951 int doingdirectory = 0, newparent = 0; 952 int error; 953 u_long cn, pcl; 954 daddr_t bn; 955 struct msdosfsmount *pmp; 956 struct direntry *dotdotp; 957 struct buf *bp; 958 959 pmp = VFSTOMSDOSFS(fdvp->v_mount); 960 961#ifdef DIAGNOSTIC 962 if ((tcnp->cn_flags & HASBUF) == 0 || 963 (fcnp->cn_flags & HASBUF) == 0) 964 panic("msdosfs_rename: no name"); 965#endif 966 /* 967 * Check for cross-device rename. 968 */ 969 if (fvp->v_mount != tdvp->v_mount || 970 (tvp && fvp->v_mount != tvp->v_mount)) { 971 error = EXDEV; 972abortit: 973 if (tdvp == tvp) 974 vrele(tdvp); 975 else 976 vput(tdvp); 977 if (tvp) 978 vput(tvp); 979 vrele(fdvp); 980 vrele(fvp); 981 return (error); 982 } 983 984 /* 985 * If source and dest are the same, do nothing. 986 */ 987 if (tvp == fvp) { 988 error = 0; 989 goto abortit; 990 } 991 992 error = vn_lock(fvp, LK_EXCLUSIVE); 993 if (error) 994 goto abortit; 995 dp = VTODE(fdvp); 996 ip = VTODE(fvp); 997 998 /* 999 * Be sure we are not renaming ".", "..", or an alias of ".". This 1000 * leads to a crippled directory tree. It's pretty tough to do a 1001 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1002 * doesn't work if the ".." entry is missing. 1003 */ 1004 if (ip->de_Attributes & ATTR_DIRECTORY) { 1005 /* 1006 * Avoid ".", "..", and aliases of "." for obvious reasons. 1007 */ 1008 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1009 dp == ip || 1010 (fcnp->cn_flags & ISDOTDOT) || 1011 (tcnp->cn_flags & ISDOTDOT) || 1012 (ip->de_flag & DE_RENAME)) { 1013 VOP_UNLOCK(fvp, 0); 1014 error = EINVAL; 1015 goto abortit; 1016 } 1017 ip->de_flag |= DE_RENAME; 1018 doingdirectory++; 1019 } 1020 1021 /* 1022 * When the target exists, both the directory 1023 * and target vnodes are returned locked. 1024 */ 1025 dp = VTODE(tdvp); 1026 xp = tvp ? VTODE(tvp) : NULL; 1027 /* 1028 * Remember direntry place to use for destination 1029 */ 1030 to_diroffset = dp->de_fndoffset; 1031 to_count = dp->de_fndcnt; 1032 1033 /* 1034 * If ".." must be changed (ie the directory gets a new 1035 * parent) then the source directory must not be in the 1036 * directory hierarchy above the target, as this would 1037 * orphan everything below the source directory. Also 1038 * the user must have write permission in the source so 1039 * as to be able to change "..". We must repeat the call 1040 * to namei, as the parent directory is unlocked by the 1041 * call to doscheckpath(). 1042 */ 1043 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1044 VOP_UNLOCK(fvp, 0); 1045 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1046 newparent = 1; 1047 if (doingdirectory && newparent) { 1048 if (error) /* write access check above */ 1049 goto bad; 1050 if (xp != NULL) 1051 vput(tvp); 1052 /* 1053 * doscheckpath() vput()'s dp, 1054 * so we have to do a relookup afterwards 1055 */ 1056 error = doscheckpath(ip, dp); 1057 if (error) 1058 goto out; 1059 if ((tcnp->cn_flags & SAVESTART) == 0) 1060 panic("msdosfs_rename: lost to startdir"); 1061 error = relookup(tdvp, &tvp, tcnp); 1062 if (error) 1063 goto out; 1064 dp = VTODE(tdvp); 1065 xp = tvp ? VTODE(tvp) : NULL; 1066 } 1067 1068 if (xp != NULL) { 1069 /* 1070 * Target must be empty if a directory and have no links 1071 * to it. Also, ensure source and target are compatible 1072 * (both directories, or both not directories). 1073 */ 1074 if (xp->de_Attributes & ATTR_DIRECTORY) { 1075 if (!dosdirempty(xp)) { 1076 error = ENOTEMPTY; 1077 goto bad; 1078 } 1079 if (!doingdirectory) { 1080 error = ENOTDIR; 1081 goto bad; 1082 } 1083 cache_purge(tdvp); 1084 } else if (doingdirectory) { 1085 error = EISDIR; 1086 goto bad; 1087 } 1088 error = removede(dp, xp); 1089 if (error) 1090 goto bad; 1091 vput(tvp); 1092 xp = NULL; 1093 } 1094 1095 /* 1096 * Convert the filename in tcnp into a dos filename. We copy this 1097 * into the denode and directory entry for the destination 1098 * file/directory. 1099 */ 1100 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1101 if (error) 1102 goto abortit; 1103 1104 /* 1105 * Since from wasn't locked at various places above, 1106 * have to do a relookup here. 1107 */ 1108 fcnp->cn_flags &= ~MODMASK; 1109 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1110 if ((fcnp->cn_flags & SAVESTART) == 0) 1111 panic("msdosfs_rename: lost from startdir"); 1112 if (!newparent) 1113 VOP_UNLOCK(tdvp, 0); 1114 if (relookup(fdvp, &fvp, fcnp) == 0) 1115 vrele(fdvp); 1116 if (fvp == NULL) { 1117 /* 1118 * From name has disappeared. 1119 */ 1120 if (doingdirectory) 1121 panic("rename: lost dir entry"); 1122 if (newparent) 1123 VOP_UNLOCK(tdvp, 0); 1124 vrele(tdvp); 1125 vrele(ap->a_fvp); 1126 return 0; 1127 } 1128 xp = VTODE(fvp); 1129 zp = VTODE(fdvp); 1130 from_diroffset = zp->de_fndoffset; 1131 1132 /* 1133 * Ensure that the directory entry still exists and has not 1134 * changed till now. If the source is a file the entry may 1135 * have been unlinked or renamed. In either case there is 1136 * no further work to be done. If the source is a directory 1137 * then it cannot have been rmdir'ed or renamed; this is 1138 * prohibited by the DE_RENAME flag. 1139 */ 1140 if (xp != ip) { 1141 if (doingdirectory) 1142 panic("rename: lost dir entry"); 1143 VOP_UNLOCK(fvp, 0); 1144 if (newparent) 1145 VOP_UNLOCK(fdvp, 0); 1146 vrele(ap->a_fvp); 1147 xp = NULL; 1148 } else { 1149 vrele(fvp); 1150 xp = NULL; 1151 1152 /* 1153 * First write a new entry in the destination 1154 * directory and mark the entry in the source directory 1155 * as deleted. Then move the denode to the correct hash 1156 * chain for its new location in the filesystem. And, if 1157 * we moved a directory, then update its .. entry to point 1158 * to the new parent directory. 1159 */ 1160 memcpy(oldname, ip->de_Name, 11); 1161 memcpy(ip->de_Name, toname, 11); /* update denode */ 1162 dp->de_fndoffset = to_diroffset; 1163 dp->de_fndcnt = to_count; 1164 error = createde(ip, dp, (struct denode **)0, tcnp); 1165 if (error) { 1166 memcpy(ip->de_Name, oldname, 11); 1167 if (newparent) 1168 VOP_UNLOCK(fdvp, 0); 1169 VOP_UNLOCK(fvp, 0); 1170 goto bad; 1171 } 1172 /* 1173 * If ip is for a directory, then its name should always 1174 * be "." since it is for the directory entry in the 1175 * directory itself (msdosfs_lookup() always translates 1176 * to the "." entry so as to get a unique denode, except 1177 * for the root directory there are different 1178 * complications). However, we just corrupted its name 1179 * to pass the correct name to createde(). Undo this. 1180 */ 1181 if ((ip->de_Attributes & ATTR_DIRECTORY) != 0) 1182 memcpy(ip->de_Name, oldname, 11); 1183 ip->de_refcnt++; 1184 zp->de_fndoffset = from_diroffset; 1185 error = removede(zp, ip); 1186 if (error) { 1187 /* XXX should downgrade to ro here, fs is corrupt */ 1188 if (newparent) 1189 VOP_UNLOCK(fdvp, 0); 1190 VOP_UNLOCK(fvp, 0); 1191 goto bad; 1192 } 1193 if (!doingdirectory) { 1194 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1195 &ip->de_dirclust, 0); 1196 if (error) { 1197 /* XXX should downgrade to ro here, fs is corrupt */ 1198 if (newparent) 1199 VOP_UNLOCK(fdvp, 0); 1200 VOP_UNLOCK(fvp, 0); 1201 goto bad; 1202 } 1203 if (ip->de_dirclust == MSDOSFSROOT) 1204 ip->de_diroffset = to_diroffset; 1205 else 1206 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1207 } 1208 reinsert(ip); 1209 if (newparent) 1210 VOP_UNLOCK(fdvp, 0); 1211 } 1212 1213 /* 1214 * If we moved a directory to a new parent directory, then we must 1215 * fixup the ".." entry in the moved directory. 1216 */ 1217 if (doingdirectory && newparent) { 1218 cn = ip->de_StartCluster; 1219 if (cn == MSDOSFSROOT) { 1220 /* this should never happen */ 1221 panic("msdosfs_rename(): updating .. in root directory?"); 1222 } else 1223 bn = cntobn(pmp, cn); 1224 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1225 NOCRED, &bp); 1226 if (error) { 1227 /* XXX should downgrade to ro here, fs is corrupt */ 1228 brelse(bp); 1229 VOP_UNLOCK(fvp, 0); 1230 goto bad; 1231 } 1232 dotdotp = (struct direntry *)bp->b_data + 1; 1233 pcl = dp->de_StartCluster; 1234 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1235 pcl = MSDOSFSROOT; 1236 putushort(dotdotp->deStartCluster, pcl); 1237 if (FAT32(pmp)) 1238 putushort(dotdotp->deHighClust, pcl >> 16); 1239 if (DOINGASYNC(fvp)) 1240 bdwrite(bp); 1241 else if ((error = bwrite(bp)) != 0) { 1242 /* XXX should downgrade to ro here, fs is corrupt */ 1243 VOP_UNLOCK(fvp, 0); 1244 goto bad; 1245 } 1246 } 1247 1248 /* 1249 * The msdosfs lookup is case insensitive. Several aliases may 1250 * be inserted for a single directory entry. As a consequnce, 1251 * name cache purge done by lookup for fvp when DELETE op for 1252 * namei is specified, might be not enough to expunge all 1253 * namecache entries that were installed for this direntry. 1254 */ 1255 cache_purge(fvp); 1256 VOP_UNLOCK(fvp, 0); 1257bad: 1258 if (xp) 1259 vput(tvp); 1260 vput(tdvp); 1261out: 1262 ip->de_flag &= ~DE_RENAME; 1263 vrele(fdvp); 1264 vrele(fvp); 1265 return (error); 1266 1267} 1268 1269static struct { 1270 struct direntry dot; 1271 struct direntry dotdot; 1272} dosdirtemplate = { 1273 { ". ", /* the . entry */ 1274 ATTR_DIRECTORY, /* file attribute */ 1275 0, /* reserved */ 1276 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1277 { 0, 0 }, /* access date */ 1278 { 0, 0 }, /* high bits of start cluster */ 1279 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1280 { 0, 0 }, /* startcluster */ 1281 { 0, 0, 0, 0 } /* filesize */ 1282 }, 1283 { ".. ", /* the .. entry */ 1284 ATTR_DIRECTORY, /* file attribute */ 1285 0, /* reserved */ 1286 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1287 { 0, 0 }, /* access date */ 1288 { 0, 0 }, /* high bits of start cluster */ 1289 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1290 { 0, 0 }, /* startcluster */ 1291 { 0, 0, 0, 0 } /* filesize */ 1292 } 1293}; 1294 1295static int 1296msdosfs_mkdir(struct vop_mkdir_args *ap) 1297{ 1298 struct componentname *cnp = ap->a_cnp; 1299 struct denode *dep; 1300 struct denode *pdep = VTODE(ap->a_dvp); 1301 struct direntry *denp; 1302 struct msdosfsmount *pmp = pdep->de_pmp; 1303 struct buf *bp; 1304 u_long newcluster, pcl; 1305 int bn; 1306 int error; 1307 struct denode ndirent; 1308 struct timespec ts; 1309 1310 /* 1311 * If this is the root directory and there is no space left we 1312 * can't do anything. This is because the root directory can not 1313 * change size. 1314 */ 1315 if (pdep->de_StartCluster == MSDOSFSROOT 1316 && pdep->de_fndoffset >= pdep->de_FileSize) { 1317 error = ENOSPC; 1318 goto bad2; 1319 } 1320 1321 /* 1322 * Allocate a cluster to hold the about to be created directory. 1323 */ 1324 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1325 if (error) 1326 goto bad2; 1327 1328 memset(&ndirent, 0, sizeof(ndirent)); 1329 ndirent.de_pmp = pmp; 1330 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1331 vfs_timestamp(&ts); 1332 DETIMES(&ndirent, &ts, &ts, &ts); 1333 1334 /* 1335 * Now fill the cluster with the "." and ".." entries. And write 1336 * the cluster to disk. This way it is there for the parent 1337 * directory to be pointing at if there were a crash. 1338 */ 1339 bn = cntobn(pmp, newcluster); 1340 /* always succeeds */ 1341 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1342 memset(bp->b_data, 0, pmp->pm_bpcluster); 1343 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1344 denp = (struct direntry *)bp->b_data; 1345 putushort(denp[0].deStartCluster, newcluster); 1346 putushort(denp[0].deCDate, ndirent.de_CDate); 1347 putushort(denp[0].deCTime, ndirent.de_CTime); 1348 denp[0].deCHundredth = ndirent.de_CHun; 1349 putushort(denp[0].deADate, ndirent.de_ADate); 1350 putushort(denp[0].deMDate, ndirent.de_MDate); 1351 putushort(denp[0].deMTime, ndirent.de_MTime); 1352 pcl = pdep->de_StartCluster; 1353 /* 1354 * Although the root directory has a non-magic starting cluster 1355 * number for FAT32, chkdsk and fsck_msdosfs still require 1356 * references to it in dotdot entries to be magic. 1357 */ 1358 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1359 pcl = MSDOSFSROOT; 1360 putushort(denp[1].deStartCluster, pcl); 1361 putushort(denp[1].deCDate, ndirent.de_CDate); 1362 putushort(denp[1].deCTime, ndirent.de_CTime); 1363 denp[1].deCHundredth = ndirent.de_CHun; 1364 putushort(denp[1].deADate, ndirent.de_ADate); 1365 putushort(denp[1].deMDate, ndirent.de_MDate); 1366 putushort(denp[1].deMTime, ndirent.de_MTime); 1367 if (FAT32(pmp)) { 1368 putushort(denp[0].deHighClust, newcluster >> 16); 1369 putushort(denp[1].deHighClust, pcl >> 16); 1370 } 1371 1372 if (DOINGASYNC(ap->a_dvp)) 1373 bdwrite(bp); 1374 else if ((error = bwrite(bp)) != 0) 1375 goto bad; 1376 1377 /* 1378 * Now build up a directory entry pointing to the newly allocated 1379 * cluster. This will be written to an empty slot in the parent 1380 * directory. 1381 */ 1382#ifdef DIAGNOSTIC 1383 if ((cnp->cn_flags & HASBUF) == 0) 1384 panic("msdosfs_mkdir: no name"); 1385#endif 1386 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1387 if (error) 1388 goto bad; 1389 1390 ndirent.de_Attributes = ATTR_DIRECTORY; 1391 ndirent.de_LowerCase = 0; 1392 ndirent.de_StartCluster = newcluster; 1393 ndirent.de_FileSize = 0; 1394 error = createde(&ndirent, pdep, &dep, cnp); 1395 if (error) 1396 goto bad; 1397 *ap->a_vpp = DETOV(dep); 1398 return (0); 1399 1400bad: 1401 clusterfree(pmp, newcluster, NULL); 1402bad2: 1403 return (error); 1404} 1405 1406static int 1407msdosfs_rmdir(struct vop_rmdir_args *ap) 1408{ 1409 struct vnode *vp = ap->a_vp; 1410 struct vnode *dvp = ap->a_dvp; 1411 struct componentname *cnp = ap->a_cnp; 1412 struct denode *ip, *dp; 1413 int error; 1414 1415 ip = VTODE(vp); 1416 dp = VTODE(dvp); 1417 1418 /* 1419 * Verify the directory is empty (and valid). 1420 * (Rmdir ".." won't be valid since 1421 * ".." will contain a reference to 1422 * the current directory and thus be 1423 * non-empty.) 1424 */ 1425 error = 0; 1426 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1427 error = ENOTEMPTY; 1428 goto out; 1429 } 1430 /* 1431 * Delete the entry from the directory. For dos filesystems this 1432 * gets rid of the directory entry on disk, the in memory copy 1433 * still exists but the de_refcnt is <= 0. This prevents it from 1434 * being found by deget(). When the vput() on dep is done we give 1435 * up access and eventually msdosfs_reclaim() will be called which 1436 * will remove it from the denode cache. 1437 */ 1438 error = removede(dp, ip); 1439 if (error) 1440 goto out; 1441 /* 1442 * This is where we decrement the link count in the parent 1443 * directory. Since dos filesystems don't do this we just purge 1444 * the name cache. 1445 */ 1446 cache_purge(dvp); 1447 /* 1448 * Truncate the directory that is being deleted. 1449 */ 1450 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1451 cache_purge(vp); 1452 1453out: 1454 return (error); 1455} 1456 1457/* 1458 * DOS filesystems don't know what symlinks are. 1459 */ 1460static int 1461msdosfs_symlink(struct vop_symlink_args *ap) 1462{ 1463 return (EOPNOTSUPP); 1464} 1465 1466static int 1467msdosfs_readdir(struct vop_readdir_args *ap) 1468{ 1469 struct mbnambuf nb; 1470 int error = 0; 1471 int diff; 1472 long n; 1473 int blsize; 1474 long on; 1475 u_long cn; 1476 u_long dirsperblk; 1477 long bias = 0; 1478 daddr_t bn, lbn; 1479 struct buf *bp; 1480 struct denode *dep = VTODE(ap->a_vp); 1481 struct msdosfsmount *pmp = dep->de_pmp; 1482 struct direntry *dentp; 1483 struct dirent dirbuf; 1484 struct uio *uio = ap->a_uio; 1485 u_long *cookies = NULL; 1486 int ncookies = 0; 1487 off_t offset, off; 1488 int chksum = -1; 1489 1490#ifdef MSDOSFS_DEBUG 1491 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1492 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1493#endif 1494 1495 /* 1496 * msdosfs_readdir() won't operate properly on regular files since 1497 * it does i/o only with the filesystem vnode, and hence can 1498 * retrieve the wrong block from the buffer cache for a plain file. 1499 * So, fail attempts to readdir() on a plain file. 1500 */ 1501 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1502 return (ENOTDIR); 1503 1504 /* 1505 * To be safe, initialize dirbuf 1506 */ 1507 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name)); 1508 1509 /* 1510 * If the user buffer is smaller than the size of one dos directory 1511 * entry or the file offset is not a multiple of the size of a 1512 * directory entry, then we fail the read. 1513 */ 1514 off = offset = uio->uio_offset; 1515 if (uio->uio_resid < sizeof(struct direntry) || 1516 (offset & (sizeof(struct direntry) - 1))) 1517 return (EINVAL); 1518 1519 if (ap->a_ncookies) { 1520 ncookies = uio->uio_resid / 16; 1521 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1522 M_WAITOK); 1523 *ap->a_cookies = cookies; 1524 *ap->a_ncookies = ncookies; 1525 } 1526 1527 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1528 1529 /* 1530 * If they are reading from the root directory then, we simulate 1531 * the . and .. entries since these don't exist in the root 1532 * directory. We also set the offset bias to make up for having to 1533 * simulate these entries. By this I mean that at file offset 64 we 1534 * read the first entry in the root directory that lives on disk. 1535 */ 1536 if (dep->de_StartCluster == MSDOSFSROOT 1537 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1538#if 0 1539 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1540 offset); 1541#endif 1542 bias = 2 * sizeof(struct direntry); 1543 if (offset < bias) { 1544 for (n = (int)offset / sizeof(struct direntry); 1545 n < 2; n++) { 1546 dirbuf.d_fileno = FAT32(pmp) ? 1547 (uint64_t)cntobn(pmp, pmp->pm_rootdirblk) * 1548 dirsperblk : 1; 1549 dirbuf.d_type = DT_DIR; 1550 switch (n) { 1551 case 0: 1552 dirbuf.d_namlen = 1; 1553 dirbuf.d_name[0] = '.'; 1554 break; 1555 case 1: 1556 dirbuf.d_namlen = 2; 1557 dirbuf.d_name[0] = '.'; 1558 dirbuf.d_name[1] = '.'; 1559 break; 1560 } 1561 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1562 /* NOTE: d_off is the offset of the *next* entry. */ 1563 dirbuf.d_off = offset + sizeof(struct direntry); 1564 dirent_terminate(&dirbuf); 1565 if (uio->uio_resid < dirbuf.d_reclen) 1566 goto out; 1567 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1568 if (error) 1569 goto out; 1570 offset += sizeof(struct direntry); 1571 off = offset; 1572 if (cookies) { 1573 *cookies++ = offset; 1574 if (--ncookies <= 0) 1575 goto out; 1576 } 1577 } 1578 } 1579 } 1580 1581 mbnambuf_init(&nb); 1582 off = offset; 1583 while (uio->uio_resid > 0) { 1584 lbn = de_cluster(pmp, offset - bias); 1585 on = (offset - bias) & pmp->pm_crbomask; 1586 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1587 diff = dep->de_FileSize - (offset - bias); 1588 if (diff <= 0) 1589 break; 1590 n = min(n, diff); 1591 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1592 if (error) 1593 break; 1594 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1595 if (error) { 1596 brelse(bp); 1597 return (error); 1598 } 1599 n = min(n, blsize - bp->b_resid); 1600 if (n == 0) { 1601 brelse(bp); 1602 return (EIO); 1603 } 1604 1605 /* 1606 * Convert from dos directory entries to fs-independent 1607 * directory entries. 1608 */ 1609 for (dentp = (struct direntry *)(bp->b_data + on); 1610 (char *)dentp < bp->b_data + on + n; 1611 dentp++, offset += sizeof(struct direntry)) { 1612#if 0 1613 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1614 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1615#endif 1616 /* 1617 * If this is an unused entry, we can stop. 1618 */ 1619 if (dentp->deName[0] == SLOT_EMPTY) { 1620 brelse(bp); 1621 goto out; 1622 } 1623 /* 1624 * Skip deleted entries. 1625 */ 1626 if (dentp->deName[0] == SLOT_DELETED) { 1627 chksum = -1; 1628 mbnambuf_init(&nb); 1629 continue; 1630 } 1631 1632 /* 1633 * Handle Win95 long directory entries 1634 */ 1635 if (dentp->deAttributes == ATTR_WIN95) { 1636 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1637 continue; 1638 chksum = win2unixfn(&nb, 1639 (struct winentry *)dentp, chksum, pmp); 1640 continue; 1641 } 1642 1643 /* 1644 * Skip volume labels 1645 */ 1646 if (dentp->deAttributes & ATTR_VOLUME) { 1647 chksum = -1; 1648 mbnambuf_init(&nb); 1649 continue; 1650 } 1651 /* 1652 * This computation of d_fileno must match 1653 * the computation of va_fileid in 1654 * msdosfs_getattr. 1655 */ 1656 if (dentp->deAttributes & ATTR_DIRECTORY) { 1657 cn = getushort(dentp->deStartCluster); 1658 if (FAT32(pmp)) { 1659 cn |= getushort(dentp->deHighClust) << 1660 16; 1661 if (cn == MSDOSFSROOT) 1662 cn = pmp->pm_rootdirblk; 1663 } 1664 if (cn == MSDOSFSROOT && !FAT32(pmp)) 1665 dirbuf.d_fileno = 1; 1666 else 1667 dirbuf.d_fileno = cntobn(pmp, cn) * 1668 dirsperblk; 1669 dirbuf.d_type = DT_DIR; 1670 } else { 1671 dirbuf.d_fileno = (uoff_t)offset / 1672 sizeof(struct direntry); 1673 dirbuf.d_type = DT_REG; 1674 } 1675 1676 if (chksum != winChksum(dentp->deName)) { 1677 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1678 (u_char *)dirbuf.d_name, 1679 dentp->deLowerCase | 1680 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1681 (LCASE_BASE | LCASE_EXT) : 0), 1682 pmp); 1683 mbnambuf_init(&nb); 1684 } else 1685 mbnambuf_flush(&nb, &dirbuf); 1686 chksum = -1; 1687 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1688 /* NOTE: d_off is the offset of the *next* entry. */ 1689 dirbuf.d_off = offset + sizeof(struct direntry); 1690 dirent_terminate(&dirbuf); 1691 if (uio->uio_resid < dirbuf.d_reclen) { 1692 brelse(bp); 1693 goto out; 1694 } 1695 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1696 if (error) { 1697 brelse(bp); 1698 goto out; 1699 } 1700 if (cookies) { 1701 *cookies++ = offset + sizeof(struct direntry); 1702 if (--ncookies <= 0) { 1703 brelse(bp); 1704 goto out; 1705 } 1706 } 1707 off = offset + sizeof(struct direntry); 1708 } 1709 brelse(bp); 1710 } 1711out: 1712 /* Subtract unused cookies */ 1713 if (ap->a_ncookies) 1714 *ap->a_ncookies -= ncookies; 1715 1716 uio->uio_offset = off; 1717 1718 /* 1719 * Set the eofflag (NFS uses it) 1720 */ 1721 if (ap->a_eofflag) { 1722 if (dep->de_FileSize - (offset - bias) <= 0) 1723 *ap->a_eofflag = 1; 1724 else 1725 *ap->a_eofflag = 0; 1726 } 1727 return (error); 1728} 1729 1730/*- 1731 * a_vp - pointer to the file's vnode 1732 * a_bn - logical block number within the file (cluster number for us) 1733 * a_bop - where to return the bufobj of the special file containing the fs 1734 * a_bnp - where to return the "physical" block number corresponding to a_bn 1735 * (relative to the special file; units are blocks of size DEV_BSIZE) 1736 * a_runp - where to return the "run past" a_bn. This is the count of logical 1737 * blocks whose physical blocks (together with a_bn's physical block) 1738 * are contiguous. 1739 * a_runb - where to return the "run before" a_bn. 1740 */ 1741static int 1742msdosfs_bmap(struct vop_bmap_args *ap) 1743{ 1744 struct denode *dep; 1745 struct mount *mp; 1746 struct msdosfsmount *pmp; 1747 struct vnode *vp; 1748 daddr_t runbn; 1749 u_long cn; 1750 int bnpercn, error, maxio, maxrun, run; 1751 1752 vp = ap->a_vp; 1753 dep = VTODE(vp); 1754 pmp = dep->de_pmp; 1755 if (ap->a_bop != NULL) 1756 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1757 if (ap->a_bnp == NULL) 1758 return (0); 1759 if (ap->a_runp != NULL) 1760 *ap->a_runp = 0; 1761 if (ap->a_runb != NULL) 1762 *ap->a_runb = 0; 1763 cn = ap->a_bn; 1764 if (cn != ap->a_bn) 1765 return (EFBIG); 1766 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1767 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1768 return (error); 1769 1770 mp = vp->v_mount; 1771 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1772 bnpercn = de_cn2bn(pmp, 1); 1773 if (ap->a_runp != NULL) { 1774 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1775 for (run = 1; run <= maxrun; run++) { 1776 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1777 runbn != *ap->a_bnp + run * bnpercn) 1778 break; 1779 } 1780 *ap->a_runp = run - 1; 1781 } 1782 if (ap->a_runb != NULL) { 1783 maxrun = ulmin(maxio - 1, cn); 1784 for (run = 1; run < maxrun; run++) { 1785 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1786 runbn != *ap->a_bnp - run * bnpercn) 1787 break; 1788 } 1789 *ap->a_runb = run - 1; 1790 } 1791 return (0); 1792} 1793 1794SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW, 0, "msdos filesystem"); 1795static int use_buf_pager = 1; 1796SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, 1797 &use_buf_pager, 0, 1798 "Use buffer pager instead of bmap"); 1799 1800static daddr_t 1801msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 1802{ 1803 1804 return (de_cluster(VTODE(vp)->de_pmp, off)); 1805} 1806 1807static int 1808msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn) 1809{ 1810 1811 return (VTODE(vp)->de_pmp->pm_bpcluster); 1812} 1813 1814static int 1815msdosfs_getpages(struct vop_getpages_args *ap) 1816{ 1817 1818 if (use_buf_pager) 1819 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count, 1820 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno, 1821 msdosfs_gbp_getblksz)); 1822 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count, 1823 ap->a_rbehind, ap->a_rahead, NULL, NULL)); 1824} 1825 1826static int 1827msdosfs_strategy(struct vop_strategy_args *ap) 1828{ 1829 struct buf *bp = ap->a_bp; 1830 struct denode *dep = VTODE(ap->a_vp); 1831 struct bufobj *bo; 1832 int error = 0; 1833 daddr_t blkno; 1834 1835 /* 1836 * If we don't already know the filesystem relative block number 1837 * then get it using pcbmap(). If pcbmap() returns the block 1838 * number as -1 then we've got a hole in the file. DOS filesystems 1839 * don't allow files with holes, so we shouldn't ever see this. 1840 */ 1841 if (bp->b_blkno == bp->b_lblkno) { 1842 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1843 bp->b_blkno = blkno; 1844 if (error) { 1845 bp->b_error = error; 1846 bp->b_ioflags |= BIO_ERROR; 1847 bufdone(bp); 1848 return (0); 1849 } 1850 if ((long)bp->b_blkno == -1) 1851 vfs_bio_clrbuf(bp); 1852 } 1853 if (bp->b_blkno == -1) { 1854 bufdone(bp); 1855 return (0); 1856 } 1857 /* 1858 * Read/write the block from/to the disk that contains the desired 1859 * file block. 1860 */ 1861 bp->b_iooffset = dbtob(bp->b_blkno); 1862 bo = dep->de_pmp->pm_bo; 1863 BO_STRATEGY(bo, bp); 1864 return (0); 1865} 1866 1867static int 1868msdosfs_print(struct vop_print_args *ap) 1869{ 1870 struct denode *dep = VTODE(ap->a_vp); 1871 1872 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1873 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1874 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1875 return (0); 1876} 1877 1878static int 1879msdosfs_pathconf(struct vop_pathconf_args *ap) 1880{ 1881 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1882 1883 switch (ap->a_name) { 1884 case _PC_FILESIZEBITS: 1885 *ap->a_retval = 32; 1886 return (0); 1887 case _PC_LINK_MAX: 1888 *ap->a_retval = 1; 1889 return (0); 1890 case _PC_NAME_MAX: 1891 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1892 return (0); 1893 case _PC_CHOWN_RESTRICTED: 1894 *ap->a_retval = 1; 1895 return (0); 1896 case _PC_NO_TRUNC: 1897 *ap->a_retval = 0; 1898 return (0); 1899 default: 1900 return (vop_stdpathconf(ap)); 1901 } 1902 /* NOTREACHED */ 1903} 1904 1905static int 1906msdosfs_vptofh(struct vop_vptofh_args *ap) 1907{ 1908 struct denode *dep; 1909 struct defid *defhp; 1910 1911 dep = VTODE(ap->a_vp); 1912 defhp = (struct defid *)ap->a_fhp; 1913 defhp->defid_len = sizeof(struct defid); 1914 defhp->defid_dirclust = dep->de_dirclust; 1915 defhp->defid_dirofs = dep->de_diroffset; 1916 /* defhp->defid_gen = dep->de_gen; */ 1917 return (0); 1918} 1919 1920/* Global vfs data structures for msdosfs */ 1921struct vop_vector msdosfs_vnodeops = { 1922 .vop_default = &default_vnodeops, 1923 1924 .vop_access = msdosfs_access, 1925 .vop_bmap = msdosfs_bmap, 1926 .vop_getpages = msdosfs_getpages, 1927 .vop_cachedlookup = msdosfs_lookup, 1928 .vop_open = msdosfs_open, 1929 .vop_close = msdosfs_close, 1930 .vop_create = msdosfs_create, 1931 .vop_fsync = msdosfs_fsync, 1932 .vop_fdatasync = vop_stdfdatasync_buf, 1933 .vop_getattr = msdosfs_getattr, 1934 .vop_inactive = msdosfs_inactive, 1935 .vop_link = msdosfs_link, 1936 .vop_lookup = vfs_cache_lookup, 1937 .vop_mkdir = msdosfs_mkdir, 1938 .vop_mknod = msdosfs_mknod, 1939 .vop_pathconf = msdosfs_pathconf, 1940 .vop_print = msdosfs_print, 1941 .vop_read = msdosfs_read, 1942 .vop_readdir = msdosfs_readdir, 1943 .vop_reclaim = msdosfs_reclaim, 1944 .vop_remove = msdosfs_remove, 1945 .vop_rename = msdosfs_rename, 1946 .vop_rmdir = msdosfs_rmdir, 1947 .vop_setattr = msdosfs_setattr, 1948 .vop_strategy = msdosfs_strategy, 1949 .vop_symlink = msdosfs_symlink, 1950 .vop_write = msdosfs_write, 1951 .vop_vptofh = msdosfs_vptofh, 1952}; 1953