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