1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 3 4 /*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /*- 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/bio.h> 54 #include <sys/buf.h> 55 #include <sys/clock.h> 56 #include <sys/dirent.h> 57 #include <sys/lock.h> 58 #include <sys/lockf.h> 59 #include <sys/malloc.h> 60 #include <sys/mount.h> 61 #include <sys/mutex.h> 62 #include <sys/namei.h> 63 #include <sys/priv.h> 64 #include <sys/stat.h> 65 #include <sys/unistd.h> 66 #include <sys/vnode.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_extern.h> 70 71 #include <fs/msdosfs/bpb.h> 72 #include <fs/msdosfs/direntry.h> 73 #include <fs/msdosfs/denode.h> 74 #include <fs/msdosfs/fat.h> 75 #include <fs/msdosfs/msdosfsmount.h> 76 77 #define DOS_FILESIZE_MAX 0xffffffff 78 79 /* 80 * Prototypes for MSDOSFS vnode operations 81 */ 82 static vop_create_t msdosfs_create; 83 static vop_mknod_t msdosfs_mknod; 84 static vop_open_t msdosfs_open; 85 static vop_close_t msdosfs_close; 86 static vop_access_t msdosfs_access; 87 static vop_getattr_t msdosfs_getattr; 88 static vop_setattr_t msdosfs_setattr; 89 static vop_read_t msdosfs_read; 90 static vop_write_t msdosfs_write; 91 static vop_fsync_t msdosfs_fsync; 92 static vop_remove_t msdosfs_remove; 93 static vop_link_t msdosfs_link; 94 static vop_rename_t msdosfs_rename; 95 static vop_mkdir_t msdosfs_mkdir; 96 static vop_rmdir_t msdosfs_rmdir; 97 static vop_symlink_t msdosfs_symlink; 98 static vop_readdir_t msdosfs_readdir; 99 static vop_bmap_t msdosfs_bmap; 100 static vop_strategy_t msdosfs_strategy; 101 static vop_print_t msdosfs_print; 102 static vop_pathconf_t msdosfs_pathconf; 103 static vop_vptofh_t msdosfs_vptofh; 104 105 /* 106 * Some general notes: 107 * 108 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 109 * read/written using the vnode for the filesystem. Blocks that represent 110 * the contents of a file are read/written using the vnode for the file 111 * (including directories when they are read/written as files). This 112 * presents problems for the dos filesystem because data that should be in 113 * an inode (if dos had them) resides in the directory itself. Since we 114 * must update directory entries without the benefit of having the vnode 115 * for the directory we must use the vnode for the filesystem. This means 116 * that when a directory is actually read/written (via read, write, or 117 * readdir, or seek) we must use the vnode for the filesystem instead of 118 * the vnode for the directory as would happen in ufs. This is to insure we 119 * retreive the correct block from the buffer cache since the hash value is 120 * based upon the vnode address and the desired block number. 121 */ 122 123 /* 124 * Create a regular file. On entry the directory to contain the file being 125 * created is locked. We must release before we return. We must also free 126 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 127 * only if the SAVESTART bit in cn_flags is clear on success. 128 */ 129 static int 130 msdosfs_create(ap) 131 struct vop_create_args /* { 132 struct vnode *a_dvp; 133 struct vnode **a_vpp; 134 struct componentname *a_cnp; 135 struct vattr *a_vap; 136 } */ *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 bzero(&ndirent, sizeof(ndirent)); 171 error = uniqdosname(pdep, cnp, ndirent.de_Name); 172 if (error) 173 goto bad; 174 175 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 176 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 177 ndirent.de_LowerCase = 0; 178 ndirent.de_StartCluster = 0; 179 ndirent.de_FileSize = 0; 180 ndirent.de_pmp = pdep->de_pmp; 181 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 182 getnanotime(&ts); 183 DETIMES(&ndirent, &ts, &ts, &ts); 184 error = createde(&ndirent, pdep, &dep, cnp); 185 if (error) 186 goto bad; 187 *ap->a_vpp = DETOV(dep); 188 return (0); 189 190 bad: 191 return (error); 192 } 193 194 static int 195 msdosfs_mknod(ap) 196 struct vop_mknod_args /* { 197 struct vnode *a_dvp; 198 struct vnode **a_vpp; 199 struct componentname *a_cnp; 200 struct vattr *a_vap; 201 } */ *ap; 202 { 203 204 return (EINVAL); 205 } 206 207 static int 208 msdosfs_open(ap) 209 struct vop_open_args /* { 210 struct vnode *a_vp; 211 int a_mode; 212 struct ucred *a_cred; 213 struct thread *a_td; 214 struct file *a_fp; 215 } */ *ap; 216 { 217 struct denode *dep = VTODE(ap->a_vp); 218 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 219 return 0; 220 } 221 222 static int 223 msdosfs_close(ap) 224 struct vop_close_args /* { 225 struct vnode *a_vp; 226 int a_fflag; 227 struct ucred *a_cred; 228 struct thread *a_td; 229 } */ *ap; 230 { 231 struct vnode *vp = ap->a_vp; 232 struct denode *dep = VTODE(vp); 233 struct timespec ts; 234 235 VI_LOCK(vp); 236 if (vp->v_usecount > 1) { 237 getnanotime(&ts); 238 DETIMES(dep, &ts, &ts, &ts); 239 } 240 VI_UNLOCK(vp); 241 return 0; 242 } 243 244 static int 245 msdosfs_access(ap) 246 struct vop_access_args /* { 247 struct vnode *a_vp; 248 accmode_t a_accmode; 249 struct ucred *a_cred; 250 struct thread *a_td; 251 } */ *ap; 252 { 253 struct vnode *vp = ap->a_vp; 254 struct denode *dep = VTODE(ap->a_vp); 255 struct msdosfsmount *pmp = dep->de_pmp; 256 mode_t file_mode; 257 accmode_t accmode = ap->a_accmode; 258 259 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 260 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 261 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 262 263 /* 264 * Disallow writing to directories and regular files if the 265 * filesystem is read-only. 266 */ 267 if (accmode & VWRITE) { 268 switch (vp->v_type) { 269 case VDIR: 270 case VREG: 271 if (vp->v_mount->mnt_flag & MNT_RDONLY) 272 return (EROFS); 273 break; 274 default: 275 break; 276 } 277 } 278 279 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 280 ap->a_accmode, ap->a_cred, NULL)); 281 } 282 283 static int 284 msdosfs_getattr(ap) 285 struct vop_getattr_args /* { 286 struct vnode *a_vp; 287 struct vattr *a_vap; 288 struct ucred *a_cred; 289 } */ *ap; 290 { 291 struct denode *dep = VTODE(ap->a_vp); 292 struct msdosfsmount *pmp = dep->de_pmp; 293 struct vattr *vap = ap->a_vap; 294 mode_t mode; 295 struct timespec ts; 296 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 297 uint64_t fileid; 298 299 getnanotime(&ts); 300 DETIMES(dep, &ts, &ts, &ts); 301 vap->va_fsid = dev2udev(pmp->pm_dev); 302 /* 303 * The following computation of the fileid must be the same as that 304 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 305 * doesn't work. 306 */ 307 if (dep->de_Attributes & ATTR_DIRECTORY) { 308 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 309 dirsperblk; 310 if (dep->de_StartCluster == MSDOSFSROOT) 311 fileid = 1; 312 } else { 313 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 314 dirsperblk; 315 if (dep->de_dirclust == MSDOSFSROOT) 316 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 317 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 318 } 319 320 if (pmp->pm_flags & MSDOSFS_LARGEFS) 321 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 322 else 323 vap->va_fileid = (long)fileid; 324 325 if ((dep->de_Attributes & ATTR_READONLY) == 0) 326 mode = S_IRWXU|S_IRWXG|S_IRWXO; 327 else 328 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 329 vap->va_mode = mode & 330 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 331 vap->va_uid = pmp->pm_uid; 332 vap->va_gid = pmp->pm_gid; 333 vap->va_nlink = 1; 334 vap->va_rdev = NODEV; 335 vap->va_size = dep->de_FileSize; 336 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 337 vap->va_ctime = vap->va_mtime; 338 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 339 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 340 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 341 0, &vap->va_birthtime); 342 } else { 343 vap->va_atime = vap->va_mtime; 344 vap->va_birthtime.tv_sec = -1; 345 vap->va_birthtime.tv_nsec = 0; 346 } 347 vap->va_flags = 0; 348 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 349 vap->va_flags |= SF_ARCHIVED; 350 vap->va_gen = 0; 351 vap->va_blocksize = pmp->pm_bpcluster; 352 vap->va_bytes = 353 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 354 vap->va_type = ap->a_vp->v_type; 355 vap->va_filerev = dep->de_modrev; 356 return (0); 357 } 358 359 static int 360 msdosfs_setattr(ap) 361 struct vop_setattr_args /* { 362 struct vnode *a_vp; 363 struct vattr *a_vap; 364 struct ucred *a_cred; 365 } */ *ap; 366 { 367 struct vnode *vp = ap->a_vp; 368 struct denode *dep = VTODE(ap->a_vp); 369 struct msdosfsmount *pmp = dep->de_pmp; 370 struct vattr *vap = ap->a_vap; 371 struct ucred *cred = ap->a_cred; 372 struct thread *td = curthread; 373 int error = 0; 374 375 #ifdef MSDOSFS_DEBUG 376 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 377 ap->a_vp, vap, cred); 378 #endif 379 380 /* 381 * Check for unsettable attributes. 382 */ 383 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 384 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 385 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 386 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 387 #ifdef MSDOSFS_DEBUG 388 printf("msdosfs_setattr(): returning EINVAL\n"); 389 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 390 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 391 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 392 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 393 printf(" va_uid %x, va_gid %x\n", 394 vap->va_uid, vap->va_gid); 395 #endif 396 return (EINVAL); 397 } 398 if (vap->va_flags != VNOVAL) { 399 if (vp->v_mount->mnt_flag & MNT_RDONLY) 400 return (EROFS); 401 if (cred->cr_uid != pmp->pm_uid) { 402 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 403 if (error) 404 return (error); 405 } 406 /* 407 * We are very inconsistent about handling unsupported 408 * attributes. We ignored the access time and the 409 * read and execute bits. We were strict for the other 410 * attributes. 411 * 412 * Here we are strict, stricter than ufs in not allowing 413 * users to attempt to set SF_SETTABLE bits or anyone to 414 * set unsupported bits. However, we ignore attempts to 415 * set ATTR_ARCHIVE for directories `cp -pr' from a more 416 * sensible filesystem attempts it a lot. 417 */ 418 if (vap->va_flags & SF_SETTABLE) { 419 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0); 420 if (error) 421 return (error); 422 } 423 if (vap->va_flags & ~SF_ARCHIVED) 424 return EOPNOTSUPP; 425 if (vap->va_flags & SF_ARCHIVED) 426 dep->de_Attributes &= ~ATTR_ARCHIVE; 427 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 428 dep->de_Attributes |= ATTR_ARCHIVE; 429 dep->de_flag |= DE_MODIFIED; 430 } 431 432 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 433 uid_t uid; 434 gid_t gid; 435 436 if (vp->v_mount->mnt_flag & MNT_RDONLY) 437 return (EROFS); 438 uid = vap->va_uid; 439 if (uid == (uid_t)VNOVAL) 440 uid = pmp->pm_uid; 441 gid = vap->va_gid; 442 if (gid == (gid_t)VNOVAL) 443 gid = pmp->pm_gid; 444 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 445 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 446 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 447 if (error) 448 return (error); 449 } 450 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 451 return EINVAL; 452 } 453 454 if (vap->va_size != VNOVAL) { 455 switch (vp->v_type) { 456 case VDIR: 457 return (EISDIR); 458 case VREG: 459 /* 460 * Truncation is only supported for regular files, 461 * Disallow it if the filesystem is read-only. 462 */ 463 if (vp->v_mount->mnt_flag & MNT_RDONLY) 464 return (EROFS); 465 break; 466 default: 467 /* 468 * According to POSIX, the result is unspecified 469 * for file types other than regular files, 470 * directories and shared memory objects. We 471 * don't support any file types except regular 472 * files and directories in this file system, so 473 * this (default) case is unreachable and can do 474 * anything. Keep falling through to detrunc() 475 * for now. 476 */ 477 break; 478 } 479 error = detrunc(dep, vap->va_size, 0, cred); 480 if (error) 481 return error; 482 } 483 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 484 if (vp->v_mount->mnt_flag & MNT_RDONLY) 485 return (EROFS); 486 if (vap->va_vaflags & VA_UTIMES_NULL) { 487 error = VOP_ACCESS(vp, VADMIN, cred, td); 488 if (error) 489 error = VOP_ACCESS(vp, VWRITE, cred, td); 490 } else 491 error = VOP_ACCESS(vp, VADMIN, cred, td); 492 if (vp->v_type != VDIR) { 493 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 494 vap->va_atime.tv_sec != VNOVAL) { 495 dep->de_flag &= ~DE_ACCESS; 496 timespec2fattime(&vap->va_atime, 0, 497 &dep->de_ADate, NULL, NULL); 498 } 499 if (vap->va_mtime.tv_sec != VNOVAL) { 500 dep->de_flag &= ~DE_UPDATE; 501 timespec2fattime(&vap->va_mtime, 0, 502 &dep->de_MDate, &dep->de_MTime, NULL); 503 } 504 dep->de_Attributes |= ATTR_ARCHIVE; 505 dep->de_flag |= DE_MODIFIED; 506 } 507 } 508 /* 509 * DOS files only have the ability to have their writability 510 * attribute set, so we use the owner write bit to set the readonly 511 * attribute. 512 */ 513 if (vap->va_mode != (mode_t)VNOVAL) { 514 if (vp->v_mount->mnt_flag & MNT_RDONLY) 515 return (EROFS); 516 if (cred->cr_uid != pmp->pm_uid) { 517 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 518 if (error) 519 return (error); 520 } 521 if (vp->v_type != VDIR) { 522 /* We ignore the read and execute bits. */ 523 if (vap->va_mode & VWRITE) 524 dep->de_Attributes &= ~ATTR_READONLY; 525 else 526 dep->de_Attributes |= ATTR_READONLY; 527 dep->de_Attributes |= ATTR_ARCHIVE; 528 dep->de_flag |= DE_MODIFIED; 529 } 530 } 531 return (deupdat(dep, 0)); 532 } 533 534 static int 535 msdosfs_read(ap) 536 struct vop_read_args /* { 537 struct vnode *a_vp; 538 struct uio *a_uio; 539 int a_ioflag; 540 struct ucred *a_cred; 541 } */ *ap; 542 { 543 int error = 0; 544 int blsize; 545 int isadir; 546 ssize_t orig_resid; 547 u_int n; 548 u_long diff; 549 u_long on; 550 daddr_t lbn; 551 daddr_t rablock; 552 int rasize; 553 int seqcount; 554 struct buf *bp; 555 struct vnode *vp = ap->a_vp; 556 struct denode *dep = VTODE(vp); 557 struct msdosfsmount *pmp = dep->de_pmp; 558 struct uio *uio = ap->a_uio; 559 560 /* 561 * If they didn't ask for any data, then we are done. 562 */ 563 orig_resid = uio->uio_resid; 564 if (orig_resid == 0) 565 return (0); 566 567 /* 568 * The caller is supposed to ensure that 569 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 570 * We don't need to check for large offsets as in ffs because 571 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large 572 * offsets cannot cause overflow even in theory. 573 */ 574 575 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 576 577 isadir = dep->de_Attributes & ATTR_DIRECTORY; 578 do { 579 if (uio->uio_offset >= dep->de_FileSize) 580 break; 581 lbn = de_cluster(pmp, uio->uio_offset); 582 rablock = lbn + 1; 583 blsize = pmp->pm_bpcluster; 584 on = uio->uio_offset & pmp->pm_crbomask; 585 /* 586 * If we are operating on a directory file then be sure to 587 * do i/o with the vnode for the filesystem instead of the 588 * vnode for the directory. 589 */ 590 if (isadir) { 591 /* convert cluster # to block # */ 592 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 593 if (error == E2BIG) { 594 error = EINVAL; 595 break; 596 } else if (error) 597 break; 598 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 599 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 600 error = bread(vp, lbn, blsize, NOCRED, &bp); 601 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 602 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 603 NOCRED, on + uio->uio_resid, seqcount, &bp); 604 } else if (seqcount > 1) { 605 rasize = blsize; 606 error = breadn(vp, lbn, 607 blsize, &rablock, &rasize, 1, NOCRED, &bp); 608 } else { 609 error = bread(vp, lbn, blsize, NOCRED, &bp); 610 } 611 if (error) { 612 brelse(bp); 613 break; 614 } 615 diff = pmp->pm_bpcluster - on; 616 n = diff > uio->uio_resid ? uio->uio_resid : diff; 617 diff = dep->de_FileSize - uio->uio_offset; 618 if (diff < n) 619 n = diff; 620 diff = blsize - bp->b_resid; 621 if (diff < n) 622 n = diff; 623 error = uiomove(bp->b_data + on, (int) n, uio); 624 brelse(bp); 625 } while (error == 0 && uio->uio_resid > 0 && n != 0); 626 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 627 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 628 dep->de_flag |= DE_ACCESS; 629 return (error); 630 } 631 632 /* 633 * Write data to a file or directory. 634 */ 635 static int 636 msdosfs_write(ap) 637 struct vop_write_args /* { 638 struct vnode *a_vp; 639 struct uio *a_uio; 640 int a_ioflag; 641 struct ucred *a_cred; 642 } */ *ap; 643 { 644 int n; 645 int croffset; 646 ssize_t resid; 647 u_long osize; 648 int error = 0; 649 u_long count; 650 int seqcount; 651 daddr_t bn, lastcn; 652 struct buf *bp; 653 int ioflag = ap->a_ioflag; 654 struct uio *uio = ap->a_uio; 655 struct vnode *vp = ap->a_vp; 656 struct vnode *thisvp; 657 struct denode *dep = VTODE(vp); 658 struct msdosfsmount *pmp = dep->de_pmp; 659 struct ucred *cred = ap->a_cred; 660 661 #ifdef MSDOSFS_DEBUG 662 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 663 vp, uio, ioflag, cred); 664 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 665 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 666 #endif 667 668 switch (vp->v_type) { 669 case VREG: 670 if (ioflag & IO_APPEND) 671 uio->uio_offset = dep->de_FileSize; 672 thisvp = vp; 673 break; 674 case VDIR: 675 return EISDIR; 676 default: 677 panic("msdosfs_write(): bad file type"); 678 } 679 680 /* 681 * This is needed (unlike in ffs_write()) because we extend the 682 * file outside of the loop but we don't want to extend the file 683 * for writes of 0 bytes. 684 */ 685 if (uio->uio_resid == 0) 686 return (0); 687 688 /* 689 * The caller is supposed to ensure that 690 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 691 */ 692 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 693 return (EFBIG); 694 695 /* 696 * If they've exceeded their filesize limit, tell them about it. 697 */ 698 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 699 return (EFBIG); 700 701 /* 702 * If the offset we are starting the write at is beyond the end of 703 * the file, then they've done a seek. Unix filesystems allow 704 * files with holes in them, DOS doesn't so we must fill the hole 705 * with zeroed blocks. 706 */ 707 if (uio->uio_offset > dep->de_FileSize) { 708 error = deextend(dep, uio->uio_offset, cred); 709 if (error) 710 return (error); 711 } 712 713 /* 714 * Remember some values in case the write fails. 715 */ 716 resid = uio->uio_resid; 717 osize = dep->de_FileSize; 718 719 /* 720 * If we write beyond the end of the file, extend it to its ultimate 721 * size ahead of the time to hopefully get a contiguous area. 722 */ 723 if (uio->uio_offset + resid > osize) { 724 count = de_clcount(pmp, uio->uio_offset + resid) - 725 de_clcount(pmp, osize); 726 error = extendfile(dep, count, NULL, NULL, 0); 727 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 728 goto errexit; 729 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 730 } else 731 lastcn = de_clcount(pmp, osize) - 1; 732 733 seqcount = ioflag >> IO_SEQSHIFT; 734 do { 735 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 736 error = ENOSPC; 737 break; 738 } 739 740 croffset = uio->uio_offset & pmp->pm_crbomask; 741 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 742 if (uio->uio_offset + n > dep->de_FileSize) { 743 dep->de_FileSize = uio->uio_offset + n; 744 /* The object size needs to be set before buffer is allocated */ 745 vnode_pager_setsize(vp, dep->de_FileSize); 746 } 747 748 bn = de_cluster(pmp, uio->uio_offset); 749 if ((uio->uio_offset & pmp->pm_crbomask) == 0 750 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 751 > de_cluster(pmp, uio->uio_offset) 752 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 753 /* 754 * If either the whole cluster gets written, 755 * or we write the cluster from its start beyond EOF, 756 * then no need to read data from disk. 757 */ 758 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 759 vfs_bio_clrbuf(bp); 760 /* 761 * Do the bmap now, since pcbmap needs buffers 762 * for the fat table. (see msdosfs_strategy) 763 */ 764 if (bp->b_blkno == bp->b_lblkno) { 765 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 766 if (error) 767 bp->b_blkno = -1; 768 else 769 bp->b_blkno = bn; 770 } 771 if (bp->b_blkno == -1) { 772 brelse(bp); 773 if (!error) 774 error = EIO; /* XXX */ 775 break; 776 } 777 } else { 778 /* 779 * The block we need to write into exists, so read it in. 780 */ 781 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 782 if (error) { 783 brelse(bp); 784 break; 785 } 786 } 787 788 /* 789 * Should these vnode_pager_* functions be done on dir 790 * files? 791 */ 792 793 /* 794 * Copy the data from user space into the buf header. 795 */ 796 error = uiomove(bp->b_data + croffset, n, uio); 797 if (error) { 798 brelse(bp); 799 break; 800 } 801 802 /* Prepare for clustered writes in some else clauses. */ 803 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 804 bp->b_flags |= B_CLUSTEROK; 805 806 /* 807 * If IO_SYNC, then each buffer is written synchronously. 808 * Otherwise, if we have a severe page deficiency then 809 * write the buffer asynchronously. Otherwise, if on a 810 * cluster boundary then write the buffer asynchronously, 811 * combining it with contiguous clusters if permitted and 812 * possible, since we don't expect more writes into this 813 * buffer soon. Otherwise, do a delayed write because we 814 * expect more writes into this buffer soon. 815 */ 816 if (ioflag & IO_SYNC) 817 (void)bwrite(bp); 818 else if (vm_page_count_severe() || buf_dirty_count_severe()) 819 bawrite(bp); 820 else if (n + croffset == pmp->pm_bpcluster) { 821 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 822 cluster_write(vp, bp, dep->de_FileSize, 823 seqcount); 824 else 825 bawrite(bp); 826 } else 827 bdwrite(bp); 828 dep->de_flag |= DE_UPDATE; 829 } while (error == 0 && uio->uio_resid > 0); 830 831 /* 832 * If the write failed and they want us to, truncate the file back 833 * to the size it was before the write was attempted. 834 */ 835 errexit: 836 if (error) { 837 if (ioflag & IO_UNIT) { 838 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 839 uio->uio_offset -= resid - uio->uio_resid; 840 uio->uio_resid = resid; 841 } else { 842 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 843 if (uio->uio_resid != resid) 844 error = 0; 845 } 846 } else if (ioflag & IO_SYNC) 847 error = deupdat(dep, 1); 848 return (error); 849 } 850 851 /* 852 * Flush the blocks of a file to disk. 853 * 854 * This function is worthless for vnodes that represent directories. Maybe we 855 * could just do a sync if they try an fsync on a directory file. 856 */ 857 static int 858 msdosfs_fsync(ap) 859 struct vop_fsync_args /* { 860 struct vnode *a_vp; 861 struct ucred *a_cred; 862 int a_waitfor; 863 struct thread *a_td; 864 } */ *ap; 865 { 866 867 vop_stdfsync(ap); 868 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT)); 869 } 870 871 static int 872 msdosfs_remove(ap) 873 struct vop_remove_args /* { 874 struct vnode *a_dvp; 875 struct vnode *a_vp; 876 struct componentname *a_cnp; 877 } */ *ap; 878 { 879 struct denode *dep = VTODE(ap->a_vp); 880 struct denode *ddep = VTODE(ap->a_dvp); 881 int error; 882 883 if (ap->a_vp->v_type == VDIR) 884 error = EPERM; 885 else 886 error = removede(ddep, dep); 887 #ifdef MSDOSFS_DEBUG 888 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 889 #endif 890 return (error); 891 } 892 893 /* 894 * DOS filesystems don't know what links are. 895 */ 896 static int 897 msdosfs_link(ap) 898 struct vop_link_args /* { 899 struct vnode *a_tdvp; 900 struct vnode *a_vp; 901 struct componentname *a_cnp; 902 } */ *ap; 903 { 904 return (EOPNOTSUPP); 905 } 906 907 /* 908 * Renames on files require moving the denode to a new hash queue since the 909 * denode's location is used to compute which hash queue to put the file 910 * in. Unless it is a rename in place. For example "mv a b". 911 * 912 * What follows is the basic algorithm: 913 * 914 * if (file move) { 915 * if (dest file exists) { 916 * remove dest file 917 * } 918 * if (dest and src in same directory) { 919 * rewrite name in existing directory slot 920 * } else { 921 * write new entry in dest directory 922 * update offset and dirclust in denode 923 * move denode to new hash chain 924 * clear old directory entry 925 * } 926 * } else { 927 * directory move 928 * if (dest directory exists) { 929 * if (dest is not empty) { 930 * return ENOTEMPTY 931 * } 932 * remove dest directory 933 * } 934 * if (dest and src in same directory) { 935 * rewrite name in existing entry 936 * } else { 937 * be sure dest is not a child of src directory 938 * write entry in dest directory 939 * update "." and ".." in moved directory 940 * clear old directory entry for moved directory 941 * } 942 * } 943 * 944 * On entry: 945 * source's parent directory is unlocked 946 * source file or directory is unlocked 947 * destination's parent directory is locked 948 * destination file or directory is locked if it exists 949 * 950 * On exit: 951 * all denodes should be released 952 */ 953 static int 954 msdosfs_rename(ap) 955 struct vop_rename_args /* { 956 struct vnode *a_fdvp; 957 struct vnode *a_fvp; 958 struct componentname *a_fcnp; 959 struct vnode *a_tdvp; 960 struct vnode *a_tvp; 961 struct componentname *a_tcnp; 962 } */ *ap; 963 { 964 struct vnode *tdvp = ap->a_tdvp; 965 struct vnode *fvp = ap->a_fvp; 966 struct vnode *fdvp = ap->a_fdvp; 967 struct vnode *tvp = ap->a_tvp; 968 struct componentname *tcnp = ap->a_tcnp; 969 struct componentname *fcnp = ap->a_fcnp; 970 struct denode *ip, *xp, *dp, *zp; 971 u_char toname[12], oldname[11]; 972 u_long from_diroffset, to_diroffset; 973 u_char to_count; 974 int doingdirectory = 0, newparent = 0; 975 int error; 976 u_long cn, pcl; 977 daddr_t bn; 978 struct denode *fddep; /* from file's parent directory */ 979 struct msdosfsmount *pmp; 980 struct direntry *dotdotp; 981 struct buf *bp; 982 983 fddep = VTODE(ap->a_fdvp); 984 pmp = fddep->de_pmp; 985 986 pmp = VFSTOMSDOSFS(fdvp->v_mount); 987 988 #ifdef DIAGNOSTIC 989 if ((tcnp->cn_flags & HASBUF) == 0 || 990 (fcnp->cn_flags & HASBUF) == 0) 991 panic("msdosfs_rename: no name"); 992 #endif 993 /* 994 * Check for cross-device rename. 995 */ 996 if (fvp->v_mount != tdvp->v_mount || 997 (tvp && fvp->v_mount != tvp->v_mount)) { 998 error = EXDEV; 999 abortit: 1000 if (tdvp == tvp) 1001 vrele(tdvp); 1002 else 1003 vput(tdvp); 1004 if (tvp) 1005 vput(tvp); 1006 vrele(fdvp); 1007 vrele(fvp); 1008 return (error); 1009 } 1010 1011 /* 1012 * If source and dest are the same, do nothing. 1013 */ 1014 if (tvp == fvp) { 1015 error = 0; 1016 goto abortit; 1017 } 1018 1019 error = vn_lock(fvp, LK_EXCLUSIVE); 1020 if (error) 1021 goto abortit; 1022 dp = VTODE(fdvp); 1023 ip = VTODE(fvp); 1024 1025 /* 1026 * Be sure we are not renaming ".", "..", or an alias of ".". This 1027 * leads to a crippled directory tree. It's pretty tough to do a 1028 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1029 * doesn't work if the ".." entry is missing. 1030 */ 1031 if (ip->de_Attributes & ATTR_DIRECTORY) { 1032 /* 1033 * Avoid ".", "..", and aliases of "." for obvious reasons. 1034 */ 1035 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1036 dp == ip || 1037 (fcnp->cn_flags & ISDOTDOT) || 1038 (tcnp->cn_flags & ISDOTDOT) || 1039 (ip->de_flag & DE_RENAME)) { 1040 VOP_UNLOCK(fvp, 0); 1041 error = EINVAL; 1042 goto abortit; 1043 } 1044 ip->de_flag |= DE_RENAME; 1045 doingdirectory++; 1046 } 1047 1048 /* 1049 * When the target exists, both the directory 1050 * and target vnodes are returned locked. 1051 */ 1052 dp = VTODE(tdvp); 1053 xp = tvp ? VTODE(tvp) : NULL; 1054 /* 1055 * Remember direntry place to use for destination 1056 */ 1057 to_diroffset = dp->de_fndoffset; 1058 to_count = dp->de_fndcnt; 1059 1060 /* 1061 * If ".." must be changed (ie the directory gets a new 1062 * parent) then the source directory must not be in the 1063 * directory hierarchy above the target, as this would 1064 * orphan everything below the source directory. Also 1065 * the user must have write permission in the source so 1066 * as to be able to change "..". We must repeat the call 1067 * to namei, as the parent directory is unlocked by the 1068 * call to doscheckpath(). 1069 */ 1070 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1071 VOP_UNLOCK(fvp, 0); 1072 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1073 newparent = 1; 1074 if (doingdirectory && newparent) { 1075 if (error) /* write access check above */ 1076 goto bad; 1077 if (xp != NULL) 1078 vput(tvp); 1079 /* 1080 * doscheckpath() vput()'s dp, 1081 * so we have to do a relookup afterwards 1082 */ 1083 error = doscheckpath(ip, dp); 1084 if (error) 1085 goto out; 1086 if ((tcnp->cn_flags & SAVESTART) == 0) 1087 panic("msdosfs_rename: lost to startdir"); 1088 error = relookup(tdvp, &tvp, tcnp); 1089 if (error) 1090 goto out; 1091 dp = VTODE(tdvp); 1092 xp = tvp ? VTODE(tvp) : NULL; 1093 } 1094 1095 if (xp != NULL) { 1096 /* 1097 * Target must be empty if a directory and have no links 1098 * to it. Also, ensure source and target are compatible 1099 * (both directories, or both not directories). 1100 */ 1101 if (xp->de_Attributes & ATTR_DIRECTORY) { 1102 if (!dosdirempty(xp)) { 1103 error = ENOTEMPTY; 1104 goto bad; 1105 } 1106 if (!doingdirectory) { 1107 error = ENOTDIR; 1108 goto bad; 1109 } 1110 cache_purge(tdvp); 1111 } else if (doingdirectory) { 1112 error = EISDIR; 1113 goto bad; 1114 } 1115 error = removede(dp, xp); 1116 if (error) 1117 goto bad; 1118 vput(tvp); 1119 xp = NULL; 1120 } 1121 1122 /* 1123 * Convert the filename in tcnp into a dos filename. We copy this 1124 * into the denode and directory entry for the destination 1125 * file/directory. 1126 */ 1127 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1128 if (error) 1129 goto abortit; 1130 1131 /* 1132 * Since from wasn't locked at various places above, 1133 * have to do a relookup here. 1134 */ 1135 fcnp->cn_flags &= ~MODMASK; 1136 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1137 if ((fcnp->cn_flags & SAVESTART) == 0) 1138 panic("msdosfs_rename: lost from startdir"); 1139 if (!newparent) 1140 VOP_UNLOCK(tdvp, 0); 1141 if (relookup(fdvp, &fvp, fcnp) == 0) 1142 vrele(fdvp); 1143 if (fvp == NULL) { 1144 /* 1145 * From name has disappeared. 1146 */ 1147 if (doingdirectory) 1148 panic("rename: lost dir entry"); 1149 if (newparent) 1150 VOP_UNLOCK(tdvp, 0); 1151 vrele(tdvp); 1152 vrele(ap->a_fvp); 1153 return 0; 1154 } 1155 xp = VTODE(fvp); 1156 zp = VTODE(fdvp); 1157 from_diroffset = zp->de_fndoffset; 1158 1159 /* 1160 * Ensure that the directory entry still exists and has not 1161 * changed till now. If the source is a file the entry may 1162 * have been unlinked or renamed. In either case there is 1163 * no further work to be done. If the source is a directory 1164 * then it cannot have been rmdir'ed or renamed; this is 1165 * prohibited by the DE_RENAME flag. 1166 */ 1167 if (xp != ip) { 1168 if (doingdirectory) 1169 panic("rename: lost dir entry"); 1170 VOP_UNLOCK(fvp, 0); 1171 if (newparent) 1172 VOP_UNLOCK(fdvp, 0); 1173 vrele(ap->a_fvp); 1174 xp = NULL; 1175 } else { 1176 vrele(fvp); 1177 xp = NULL; 1178 1179 /* 1180 * First write a new entry in the destination 1181 * directory and mark the entry in the source directory 1182 * as deleted. Then move the denode to the correct hash 1183 * chain for its new location in the filesystem. And, if 1184 * we moved a directory, then update its .. entry to point 1185 * to the new parent directory. 1186 */ 1187 bcopy(ip->de_Name, oldname, 11); 1188 bcopy(toname, ip->de_Name, 11); /* update denode */ 1189 dp->de_fndoffset = to_diroffset; 1190 dp->de_fndcnt = to_count; 1191 error = createde(ip, dp, (struct denode **)0, tcnp); 1192 if (error) { 1193 bcopy(oldname, ip->de_Name, 11); 1194 if (newparent) 1195 VOP_UNLOCK(fdvp, 0); 1196 VOP_UNLOCK(fvp, 0); 1197 goto bad; 1198 } 1199 ip->de_refcnt++; 1200 zp->de_fndoffset = from_diroffset; 1201 error = removede(zp, ip); 1202 if (error) { 1203 /* XXX should downgrade to ro here, fs is corrupt */ 1204 if (newparent) 1205 VOP_UNLOCK(fdvp, 0); 1206 VOP_UNLOCK(fvp, 0); 1207 goto bad; 1208 } 1209 if (!doingdirectory) { 1210 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1211 &ip->de_dirclust, 0); 1212 if (error) { 1213 /* XXX should downgrade to ro here, fs is corrupt */ 1214 if (newparent) 1215 VOP_UNLOCK(fdvp, 0); 1216 VOP_UNLOCK(fvp, 0); 1217 goto bad; 1218 } 1219 if (ip->de_dirclust == MSDOSFSROOT) 1220 ip->de_diroffset = to_diroffset; 1221 else 1222 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1223 } 1224 reinsert(ip); 1225 if (newparent) 1226 VOP_UNLOCK(fdvp, 0); 1227 } 1228 1229 /* 1230 * If we moved a directory to a new parent directory, then we must 1231 * fixup the ".." entry in the moved directory. 1232 */ 1233 if (doingdirectory && newparent) { 1234 cn = ip->de_StartCluster; 1235 if (cn == MSDOSFSROOT) { 1236 /* this should never happen */ 1237 panic("msdosfs_rename(): updating .. in root directory?"); 1238 } else 1239 bn = cntobn(pmp, cn); 1240 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1241 NOCRED, &bp); 1242 if (error) { 1243 /* XXX should downgrade to ro here, fs is corrupt */ 1244 brelse(bp); 1245 VOP_UNLOCK(fvp, 0); 1246 goto bad; 1247 } 1248 dotdotp = (struct direntry *)bp->b_data + 1; 1249 pcl = dp->de_StartCluster; 1250 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1251 pcl = MSDOSFSROOT; 1252 putushort(dotdotp->deStartCluster, pcl); 1253 if (FAT32(pmp)) 1254 putushort(dotdotp->deHighClust, pcl >> 16); 1255 if (DOINGASYNC(fvp)) 1256 bdwrite(bp); 1257 else if ((error = bwrite(bp)) != 0) { 1258 /* XXX should downgrade to ro here, fs is corrupt */ 1259 VOP_UNLOCK(fvp, 0); 1260 goto bad; 1261 } 1262 } 1263 1264 /* 1265 * The msdosfs lookup is case insensitive. Several aliases may 1266 * be inserted for a single directory entry. As a consequnce, 1267 * name cache purge done by lookup for fvp when DELETE op for 1268 * namei is specified, might be not enough to expunge all 1269 * namecache entries that were installed for this direntry. 1270 */ 1271 cache_purge(fvp); 1272 VOP_UNLOCK(fvp, 0); 1273 bad: 1274 if (xp) 1275 vput(tvp); 1276 vput(tdvp); 1277 out: 1278 ip->de_flag &= ~DE_RENAME; 1279 vrele(fdvp); 1280 vrele(fvp); 1281 return (error); 1282 1283 } 1284 1285 static struct { 1286 struct direntry dot; 1287 struct direntry dotdot; 1288 } dosdirtemplate = { 1289 { ". ", /* the . entry */ 1290 ATTR_DIRECTORY, /* file attribute */ 1291 0, /* reserved */ 1292 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1293 { 0, 0 }, /* access date */ 1294 { 0, 0 }, /* high bits of start cluster */ 1295 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1296 { 0, 0 }, /* startcluster */ 1297 { 0, 0, 0, 0 } /* filesize */ 1298 }, 1299 { ".. ", /* the .. entry */ 1300 ATTR_DIRECTORY, /* file attribute */ 1301 0, /* reserved */ 1302 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1303 { 0, 0 }, /* access date */ 1304 { 0, 0 }, /* high bits of start cluster */ 1305 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1306 { 0, 0 }, /* startcluster */ 1307 { 0, 0, 0, 0 } /* filesize */ 1308 } 1309 }; 1310 1311 static int 1312 msdosfs_mkdir(ap) 1313 struct vop_mkdir_args /* { 1314 struct vnode *a_dvp; 1315 struct vnode **a_vpp; 1316 struvt componentname *a_cnp; 1317 struct vattr *a_vap; 1318 } */ *ap; 1319 { 1320 struct componentname *cnp = ap->a_cnp; 1321 struct denode *dep; 1322 struct denode *pdep = VTODE(ap->a_dvp); 1323 struct direntry *denp; 1324 struct msdosfsmount *pmp = pdep->de_pmp; 1325 struct buf *bp; 1326 u_long newcluster, pcl; 1327 int bn; 1328 int error; 1329 struct denode ndirent; 1330 struct timespec ts; 1331 1332 /* 1333 * If this is the root directory and there is no space left we 1334 * can't do anything. This is because the root directory can not 1335 * change size. 1336 */ 1337 if (pdep->de_StartCluster == MSDOSFSROOT 1338 && pdep->de_fndoffset >= pdep->de_FileSize) { 1339 error = ENOSPC; 1340 goto bad2; 1341 } 1342 1343 /* 1344 * Allocate a cluster to hold the about to be created directory. 1345 */ 1346 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1347 if (error) 1348 goto bad2; 1349 1350 bzero(&ndirent, sizeof(ndirent)); 1351 ndirent.de_pmp = pmp; 1352 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1353 getnanotime(&ts); 1354 DETIMES(&ndirent, &ts, &ts, &ts); 1355 1356 /* 1357 * Now fill the cluster with the "." and ".." entries. And write 1358 * the cluster to disk. This way it is there for the parent 1359 * directory to be pointing at if there were a crash. 1360 */ 1361 bn = cntobn(pmp, newcluster); 1362 /* always succeeds */ 1363 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1364 bzero(bp->b_data, pmp->pm_bpcluster); 1365 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1366 denp = (struct direntry *)bp->b_data; 1367 putushort(denp[0].deStartCluster, newcluster); 1368 putushort(denp[0].deCDate, ndirent.de_CDate); 1369 putushort(denp[0].deCTime, ndirent.de_CTime); 1370 denp[0].deCHundredth = ndirent.de_CHun; 1371 putushort(denp[0].deADate, ndirent.de_ADate); 1372 putushort(denp[0].deMDate, ndirent.de_MDate); 1373 putushort(denp[0].deMTime, ndirent.de_MTime); 1374 pcl = pdep->de_StartCluster; 1375 /* 1376 * Although the root directory has a non-magic starting cluster 1377 * number for FAT32, chkdsk and fsck_msdosfs still require 1378 * references to it in dotdot entries to be magic. 1379 */ 1380 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1381 pcl = MSDOSFSROOT; 1382 putushort(denp[1].deStartCluster, pcl); 1383 putushort(denp[1].deCDate, ndirent.de_CDate); 1384 putushort(denp[1].deCTime, ndirent.de_CTime); 1385 denp[1].deCHundredth = ndirent.de_CHun; 1386 putushort(denp[1].deADate, ndirent.de_ADate); 1387 putushort(denp[1].deMDate, ndirent.de_MDate); 1388 putushort(denp[1].deMTime, ndirent.de_MTime); 1389 if (FAT32(pmp)) { 1390 putushort(denp[0].deHighClust, newcluster >> 16); 1391 putushort(denp[1].deHighClust, pcl >> 16); 1392 } 1393 1394 if (DOINGASYNC(ap->a_dvp)) 1395 bdwrite(bp); 1396 else if ((error = bwrite(bp)) != 0) 1397 goto bad; 1398 1399 /* 1400 * Now build up a directory entry pointing to the newly allocated 1401 * cluster. This will be written to an empty slot in the parent 1402 * directory. 1403 */ 1404 #ifdef DIAGNOSTIC 1405 if ((cnp->cn_flags & HASBUF) == 0) 1406 panic("msdosfs_mkdir: no name"); 1407 #endif 1408 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1409 if (error) 1410 goto bad; 1411 1412 ndirent.de_Attributes = ATTR_DIRECTORY; 1413 ndirent.de_LowerCase = 0; 1414 ndirent.de_StartCluster = newcluster; 1415 ndirent.de_FileSize = 0; 1416 error = createde(&ndirent, pdep, &dep, cnp); 1417 if (error) 1418 goto bad; 1419 *ap->a_vpp = DETOV(dep); 1420 return (0); 1421 1422 bad: 1423 clusterfree(pmp, newcluster, NULL); 1424 bad2: 1425 return (error); 1426 } 1427 1428 static int 1429 msdosfs_rmdir(ap) 1430 struct vop_rmdir_args /* { 1431 struct vnode *a_dvp; 1432 struct vnode *a_vp; 1433 struct componentname *a_cnp; 1434 } */ *ap; 1435 { 1436 struct vnode *vp = ap->a_vp; 1437 struct vnode *dvp = ap->a_dvp; 1438 struct componentname *cnp = ap->a_cnp; 1439 struct denode *ip, *dp; 1440 int error; 1441 1442 ip = VTODE(vp); 1443 dp = VTODE(dvp); 1444 1445 /* 1446 * Verify the directory is empty (and valid). 1447 * (Rmdir ".." won't be valid since 1448 * ".." will contain a reference to 1449 * the current directory and thus be 1450 * non-empty.) 1451 */ 1452 error = 0; 1453 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1454 error = ENOTEMPTY; 1455 goto out; 1456 } 1457 /* 1458 * Delete the entry from the directory. For dos filesystems this 1459 * gets rid of the directory entry on disk, the in memory copy 1460 * still exists but the de_refcnt is <= 0. This prevents it from 1461 * being found by deget(). When the vput() on dep is done we give 1462 * up access and eventually msdosfs_reclaim() will be called which 1463 * will remove it from the denode cache. 1464 */ 1465 error = removede(dp, ip); 1466 if (error) 1467 goto out; 1468 /* 1469 * This is where we decrement the link count in the parent 1470 * directory. Since dos filesystems don't do this we just purge 1471 * the name cache. 1472 */ 1473 cache_purge(dvp); 1474 /* 1475 * Truncate the directory that is being deleted. 1476 */ 1477 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1478 cache_purge(vp); 1479 1480 out: 1481 return (error); 1482 } 1483 1484 /* 1485 * DOS filesystems don't know what symlinks are. 1486 */ 1487 static int 1488 msdosfs_symlink(ap) 1489 struct vop_symlink_args /* { 1490 struct vnode *a_dvp; 1491 struct vnode **a_vpp; 1492 struct componentname *a_cnp; 1493 struct vattr *a_vap; 1494 char *a_target; 1495 } */ *ap; 1496 { 1497 return (EOPNOTSUPP); 1498 } 1499 1500 static int 1501 msdosfs_readdir(ap) 1502 struct vop_readdir_args /* { 1503 struct vnode *a_vp; 1504 struct uio *a_uio; 1505 struct ucred *a_cred; 1506 int *a_eofflag; 1507 int *a_ncookies; 1508 u_long **a_cookies; 1509 } */ *ap; 1510 { 1511 struct mbnambuf nb; 1512 int error = 0; 1513 int diff; 1514 long n; 1515 int blsize; 1516 long on; 1517 u_long cn; 1518 uint64_t fileno; 1519 u_long dirsperblk; 1520 long bias = 0; 1521 daddr_t bn, lbn; 1522 struct buf *bp; 1523 struct denode *dep = VTODE(ap->a_vp); 1524 struct msdosfsmount *pmp = dep->de_pmp; 1525 struct direntry *dentp; 1526 struct dirent dirbuf; 1527 struct uio *uio = ap->a_uio; 1528 u_long *cookies = NULL; 1529 int ncookies = 0; 1530 off_t offset, off; 1531 int chksum = -1; 1532 1533 #ifdef MSDOSFS_DEBUG 1534 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1535 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1536 #endif 1537 1538 /* 1539 * msdosfs_readdir() won't operate properly on regular files since 1540 * it does i/o only with the filesystem vnode, and hence can 1541 * retrieve the wrong block from the buffer cache for a plain file. 1542 * So, fail attempts to readdir() on a plain file. 1543 */ 1544 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1545 return (ENOTDIR); 1546 1547 /* 1548 * To be safe, initialize dirbuf 1549 */ 1550 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1551 1552 /* 1553 * If the user buffer is smaller than the size of one dos directory 1554 * entry or the file offset is not a multiple of the size of a 1555 * directory entry, then we fail the read. 1556 */ 1557 off = offset = uio->uio_offset; 1558 if (uio->uio_resid < sizeof(struct direntry) || 1559 (offset & (sizeof(struct direntry) - 1))) 1560 return (EINVAL); 1561 1562 if (ap->a_ncookies) { 1563 ncookies = uio->uio_resid / 16; 1564 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1565 M_WAITOK); 1566 *ap->a_cookies = cookies; 1567 *ap->a_ncookies = ncookies; 1568 } 1569 1570 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1571 1572 /* 1573 * If they are reading from the root directory then, we simulate 1574 * the . and .. entries since these don't exist in the root 1575 * directory. We also set the offset bias to make up for having to 1576 * simulate these entries. By this I mean that at file offset 64 we 1577 * read the first entry in the root directory that lives on disk. 1578 */ 1579 if (dep->de_StartCluster == MSDOSFSROOT 1580 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1581 #if 0 1582 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1583 offset); 1584 #endif 1585 bias = 2 * sizeof(struct direntry); 1586 if (offset < bias) { 1587 for (n = (int)offset / sizeof(struct direntry); 1588 n < 2; n++) { 1589 if (FAT32(pmp)) 1590 fileno = (uint64_t)cntobn(pmp, 1591 pmp->pm_rootdirblk) 1592 * dirsperblk; 1593 else 1594 fileno = 1; 1595 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1596 dirbuf.d_fileno = 1597 msdosfs_fileno_map(pmp->pm_mountp, 1598 fileno); 1599 } else { 1600 1601 dirbuf.d_fileno = (uint32_t)fileno; 1602 } 1603 dirbuf.d_type = DT_DIR; 1604 switch (n) { 1605 case 0: 1606 dirbuf.d_namlen = 1; 1607 strcpy(dirbuf.d_name, "."); 1608 break; 1609 case 1: 1610 dirbuf.d_namlen = 2; 1611 strcpy(dirbuf.d_name, ".."); 1612 break; 1613 } 1614 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1615 if (uio->uio_resid < dirbuf.d_reclen) 1616 goto out; 1617 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1618 if (error) 1619 goto out; 1620 offset += sizeof(struct direntry); 1621 off = offset; 1622 if (cookies) { 1623 *cookies++ = offset; 1624 if (--ncookies <= 0) 1625 goto out; 1626 } 1627 } 1628 } 1629 } 1630 1631 mbnambuf_init(&nb); 1632 off = offset; 1633 while (uio->uio_resid > 0) { 1634 lbn = de_cluster(pmp, offset - bias); 1635 on = (offset - bias) & pmp->pm_crbomask; 1636 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1637 diff = dep->de_FileSize - (offset - bias); 1638 if (diff <= 0) 1639 break; 1640 n = min(n, diff); 1641 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1642 if (error) 1643 break; 1644 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1645 if (error) { 1646 brelse(bp); 1647 return (error); 1648 } 1649 n = min(n, blsize - bp->b_resid); 1650 if (n == 0) { 1651 brelse(bp); 1652 return (EIO); 1653 } 1654 1655 /* 1656 * Convert from dos directory entries to fs-independent 1657 * directory entries. 1658 */ 1659 for (dentp = (struct direntry *)(bp->b_data + on); 1660 (char *)dentp < bp->b_data + on + n; 1661 dentp++, offset += sizeof(struct direntry)) { 1662 #if 0 1663 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1664 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1665 #endif 1666 /* 1667 * If this is an unused entry, we can stop. 1668 */ 1669 if (dentp->deName[0] == SLOT_EMPTY) { 1670 brelse(bp); 1671 goto out; 1672 } 1673 /* 1674 * Skip deleted entries. 1675 */ 1676 if (dentp->deName[0] == SLOT_DELETED) { 1677 chksum = -1; 1678 mbnambuf_init(&nb); 1679 continue; 1680 } 1681 1682 /* 1683 * Handle Win95 long directory entries 1684 */ 1685 if (dentp->deAttributes == ATTR_WIN95) { 1686 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1687 continue; 1688 chksum = win2unixfn(&nb, 1689 (struct winentry *)dentp, chksum, pmp); 1690 continue; 1691 } 1692 1693 /* 1694 * Skip volume labels 1695 */ 1696 if (dentp->deAttributes & ATTR_VOLUME) { 1697 chksum = -1; 1698 mbnambuf_init(&nb); 1699 continue; 1700 } 1701 /* 1702 * This computation of d_fileno must match 1703 * the computation of va_fileid in 1704 * msdosfs_getattr. 1705 */ 1706 if (dentp->deAttributes & ATTR_DIRECTORY) { 1707 fileno = getushort(dentp->deStartCluster); 1708 if (FAT32(pmp)) 1709 fileno |= getushort(dentp->deHighClust) << 16; 1710 /* if this is the root directory */ 1711 if (fileno == MSDOSFSROOT) 1712 if (FAT32(pmp)) 1713 fileno = (uint64_t)cntobn(pmp, 1714 pmp->pm_rootdirblk) 1715 * dirsperblk; 1716 else 1717 fileno = 1; 1718 else 1719 fileno = (uint64_t)cntobn(pmp, fileno) * 1720 dirsperblk; 1721 dirbuf.d_type = DT_DIR; 1722 } else { 1723 fileno = (uoff_t)offset / 1724 sizeof(struct direntry); 1725 dirbuf.d_type = DT_REG; 1726 } 1727 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1728 dirbuf.d_fileno = 1729 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1730 } else 1731 dirbuf.d_fileno = (uint32_t)fileno; 1732 1733 if (chksum != winChksum(dentp->deName)) { 1734 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1735 (u_char *)dirbuf.d_name, 1736 dentp->deLowerCase | 1737 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1738 (LCASE_BASE | LCASE_EXT) : 0), 1739 pmp); 1740 mbnambuf_init(&nb); 1741 } else 1742 mbnambuf_flush(&nb, &dirbuf); 1743 chksum = -1; 1744 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1745 if (uio->uio_resid < dirbuf.d_reclen) { 1746 brelse(bp); 1747 goto out; 1748 } 1749 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1750 if (error) { 1751 brelse(bp); 1752 goto out; 1753 } 1754 if (cookies) { 1755 *cookies++ = offset + sizeof(struct direntry); 1756 if (--ncookies <= 0) { 1757 brelse(bp); 1758 goto out; 1759 } 1760 } 1761 off = offset + sizeof(struct direntry); 1762 } 1763 brelse(bp); 1764 } 1765 out: 1766 /* Subtract unused cookies */ 1767 if (ap->a_ncookies) 1768 *ap->a_ncookies -= ncookies; 1769 1770 uio->uio_offset = off; 1771 1772 /* 1773 * Set the eofflag (NFS uses it) 1774 */ 1775 if (ap->a_eofflag) { 1776 if (dep->de_FileSize - (offset - bias) <= 0) 1777 *ap->a_eofflag = 1; 1778 else 1779 *ap->a_eofflag = 0; 1780 } 1781 return (error); 1782 } 1783 1784 /*- 1785 * a_vp - pointer to the file's vnode 1786 * a_bn - logical block number within the file (cluster number for us) 1787 * a_bop - where to return the bufobj of the special file containing the fs 1788 * a_bnp - where to return the "physical" block number corresponding to a_bn 1789 * (relative to the special file; units are blocks of size DEV_BSIZE) 1790 * a_runp - where to return the "run past" a_bn. This is the count of logical 1791 * blocks whose physical blocks (together with a_bn's physical block) 1792 * are contiguous. 1793 * a_runb - where to return the "run before" a_bn. 1794 */ 1795 static int 1796 msdosfs_bmap(ap) 1797 struct vop_bmap_args /* { 1798 struct vnode *a_vp; 1799 daddr_t a_bn; 1800 struct bufobj **a_bop; 1801 daddr_t *a_bnp; 1802 int *a_runp; 1803 int *a_runb; 1804 } */ *ap; 1805 { 1806 struct denode *dep; 1807 struct mount *mp; 1808 struct msdosfsmount *pmp; 1809 struct vnode *vp; 1810 daddr_t runbn; 1811 u_long cn; 1812 int bnpercn, error, maxio, maxrun, run; 1813 1814 vp = ap->a_vp; 1815 dep = VTODE(vp); 1816 pmp = dep->de_pmp; 1817 if (ap->a_bop != NULL) 1818 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1819 if (ap->a_bnp == NULL) 1820 return (0); 1821 if (ap->a_runp != NULL) 1822 *ap->a_runp = 0; 1823 if (ap->a_runb != NULL) 1824 *ap->a_runb = 0; 1825 cn = ap->a_bn; 1826 if (cn != ap->a_bn) 1827 return (EFBIG); 1828 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1829 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1830 return (error); 1831 1832 mp = vp->v_mount; 1833 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1834 bnpercn = de_cn2bn(pmp, 1); 1835 if (ap->a_runp != NULL) { 1836 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1837 for (run = 1; run <= maxrun; run++) { 1838 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1839 runbn != *ap->a_bnp + run * bnpercn) 1840 break; 1841 } 1842 *ap->a_runp = run - 1; 1843 } 1844 if (ap->a_runb != NULL) { 1845 maxrun = ulmin(maxio - 1, cn); 1846 for (run = 1; run < maxrun; run++) { 1847 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1848 runbn != *ap->a_bnp - run * bnpercn) 1849 break; 1850 } 1851 *ap->a_runb = run - 1; 1852 } 1853 return (0); 1854 } 1855 1856 static int 1857 msdosfs_strategy(ap) 1858 struct vop_strategy_args /* { 1859 struct vnode *a_vp; 1860 struct buf *a_bp; 1861 } */ *ap; 1862 { 1863 struct buf *bp = ap->a_bp; 1864 struct denode *dep = VTODE(ap->a_vp); 1865 struct bufobj *bo; 1866 int error = 0; 1867 daddr_t blkno; 1868 1869 /* 1870 * If we don't already know the filesystem relative block number 1871 * then get it using pcbmap(). If pcbmap() returns the block 1872 * number as -1 then we've got a hole in the file. DOS filesystems 1873 * don't allow files with holes, so we shouldn't ever see this. 1874 */ 1875 if (bp->b_blkno == bp->b_lblkno) { 1876 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1877 bp->b_blkno = blkno; 1878 if (error) { 1879 bp->b_error = error; 1880 bp->b_ioflags |= BIO_ERROR; 1881 bufdone(bp); 1882 return (0); 1883 } 1884 if ((long)bp->b_blkno == -1) 1885 vfs_bio_clrbuf(bp); 1886 } 1887 if (bp->b_blkno == -1) { 1888 bufdone(bp); 1889 return (0); 1890 } 1891 /* 1892 * Read/write the block from/to the disk that contains the desired 1893 * file block. 1894 */ 1895 bp->b_iooffset = dbtob(bp->b_blkno); 1896 bo = dep->de_pmp->pm_bo; 1897 BO_STRATEGY(bo, bp); 1898 return (0); 1899 } 1900 1901 static int 1902 msdosfs_print(ap) 1903 struct vop_print_args /* { 1904 struct vnode *vp; 1905 } */ *ap; 1906 { 1907 struct denode *dep = VTODE(ap->a_vp); 1908 1909 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1910 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1911 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1912 return (0); 1913 } 1914 1915 static int 1916 msdosfs_pathconf(ap) 1917 struct vop_pathconf_args /* { 1918 struct vnode *a_vp; 1919 int a_name; 1920 int *a_retval; 1921 } */ *ap; 1922 { 1923 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1924 1925 switch (ap->a_name) { 1926 case _PC_LINK_MAX: 1927 *ap->a_retval = 1; 1928 return (0); 1929 case _PC_NAME_MAX: 1930 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1931 return (0); 1932 case _PC_PATH_MAX: 1933 *ap->a_retval = PATH_MAX; 1934 return (0); 1935 case _PC_CHOWN_RESTRICTED: 1936 *ap->a_retval = 1; 1937 return (0); 1938 case _PC_NO_TRUNC: 1939 *ap->a_retval = 0; 1940 return (0); 1941 default: 1942 return (EINVAL); 1943 } 1944 /* NOTREACHED */ 1945 } 1946 1947 static int 1948 msdosfs_vptofh(ap) 1949 struct vop_vptofh_args /* { 1950 struct vnode *a_vp; 1951 struct fid *a_fhp; 1952 } */ *ap; 1953 { 1954 struct denode *dep; 1955 struct defid *defhp; 1956 1957 dep = VTODE(ap->a_vp); 1958 defhp = (struct defid *)ap->a_fhp; 1959 defhp->defid_len = sizeof(struct defid); 1960 defhp->defid_dirclust = dep->de_dirclust; 1961 defhp->defid_dirofs = dep->de_diroffset; 1962 /* defhp->defid_gen = dep->de_gen; */ 1963 return (0); 1964 } 1965 1966 /* Global vfs data structures for msdosfs */ 1967 struct vop_vector msdosfs_vnodeops = { 1968 .vop_default = &default_vnodeops, 1969 1970 .vop_access = msdosfs_access, 1971 .vop_bmap = msdosfs_bmap, 1972 .vop_cachedlookup = msdosfs_lookup, 1973 .vop_open = msdosfs_open, 1974 .vop_close = msdosfs_close, 1975 .vop_create = msdosfs_create, 1976 .vop_fsync = msdosfs_fsync, 1977 .vop_getattr = msdosfs_getattr, 1978 .vop_inactive = msdosfs_inactive, 1979 .vop_link = msdosfs_link, 1980 .vop_lookup = vfs_cache_lookup, 1981 .vop_mkdir = msdosfs_mkdir, 1982 .vop_mknod = msdosfs_mknod, 1983 .vop_pathconf = msdosfs_pathconf, 1984 .vop_print = msdosfs_print, 1985 .vop_read = msdosfs_read, 1986 .vop_readdir = msdosfs_readdir, 1987 .vop_reclaim = msdosfs_reclaim, 1988 .vop_remove = msdosfs_remove, 1989 .vop_rename = msdosfs_rename, 1990 .vop_rmdir = msdosfs_rmdir, 1991 .vop_setattr = msdosfs_setattr, 1992 .vop_strategy = msdosfs_strategy, 1993 .vop_symlink = msdosfs_symlink, 1994 .vop_write = msdosfs_write, 1995 .vop_vptofh = msdosfs_vptofh, 1996 }; 1997