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/proc.h> 65 #include <sys/resourcevar.h> 66 #include <sys/signalvar.h> 67 #include <sys/stat.h> 68 #include <sys/unistd.h> 69 #include <sys/vnode.h> 70 71 #include <vm/vm.h> 72 #include <vm/vm_extern.h> 73 74 #include <fs/msdosfs/bpb.h> 75 #include <fs/msdosfs/direntry.h> 76 #include <fs/msdosfs/denode.h> 77 #include <fs/msdosfs/fat.h> 78 #include <fs/msdosfs/msdosfsmount.h> 79 80 #define DOS_FILESIZE_MAX 0xffffffff 81 82 /* 83 * Prototypes for MSDOSFS vnode operations 84 */ 85 static vop_create_t msdosfs_create; 86 static vop_mknod_t msdosfs_mknod; 87 static vop_open_t msdosfs_open; 88 static vop_close_t msdosfs_close; 89 static vop_access_t msdosfs_access; 90 static vop_getattr_t msdosfs_getattr; 91 static vop_setattr_t msdosfs_setattr; 92 static vop_read_t msdosfs_read; 93 static vop_write_t msdosfs_write; 94 static vop_fsync_t msdosfs_fsync; 95 static vop_remove_t msdosfs_remove; 96 static vop_link_t msdosfs_link; 97 static vop_rename_t msdosfs_rename; 98 static vop_mkdir_t msdosfs_mkdir; 99 static vop_rmdir_t msdosfs_rmdir; 100 static vop_symlink_t msdosfs_symlink; 101 static vop_readdir_t msdosfs_readdir; 102 static vop_bmap_t msdosfs_bmap; 103 static vop_strategy_t msdosfs_strategy; 104 static vop_print_t msdosfs_print; 105 static vop_pathconf_t msdosfs_pathconf; 106 static vop_vptofh_t msdosfs_vptofh; 107 108 /* 109 * Some general notes: 110 * 111 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 112 * read/written using the vnode for the filesystem. Blocks that represent 113 * the contents of a file are read/written using the vnode for the file 114 * (including directories when they are read/written as files). This 115 * presents problems for the dos filesystem because data that should be in 116 * an inode (if dos had them) resides in the directory itself. Since we 117 * must update directory entries without the benefit of having the vnode 118 * for the directory we must use the vnode for the filesystem. This means 119 * that when a directory is actually read/written (via read, write, or 120 * readdir, or seek) we must use the vnode for the filesystem instead of 121 * the vnode for the directory as would happen in ufs. This is to insure we 122 * retreive the correct block from the buffer cache since the hash value is 123 * based upon the vnode address and the desired block number. 124 */ 125 126 /* 127 * Create a regular file. On entry the directory to contain the file being 128 * created is locked. We must release before we return. We must also free 129 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 130 * only if the SAVESTART bit in cn_flags is clear on success. 131 */ 132 static int 133 msdosfs_create(ap) 134 struct vop_create_args /* { 135 struct vnode *a_dvp; 136 struct vnode **a_vpp; 137 struct componentname *a_cnp; 138 struct vattr *a_vap; 139 } */ *ap; 140 { 141 struct componentname *cnp = ap->a_cnp; 142 struct denode ndirent; 143 struct denode *dep; 144 struct denode *pdep = VTODE(ap->a_dvp); 145 struct timespec ts; 146 int error; 147 148 #ifdef MSDOSFS_DEBUG 149 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 150 #endif 151 152 /* 153 * If this is the root directory and there is no space left we 154 * can't do anything. This is because the root directory can not 155 * change size. 156 */ 157 if (pdep->de_StartCluster == MSDOSFSROOT 158 && pdep->de_fndoffset >= pdep->de_FileSize) { 159 error = ENOSPC; 160 goto bad; 161 } 162 163 /* 164 * Create a directory entry for the file, then call createde() to 165 * have it installed. NOTE: DOS files are always executable. We 166 * use the absence of the owner write bit to make the file 167 * readonly. 168 */ 169 #ifdef DIAGNOSTIC 170 if ((cnp->cn_flags & HASBUF) == 0) 171 panic("msdosfs_create: no name"); 172 #endif 173 bzero(&ndirent, sizeof(ndirent)); 174 error = uniqdosname(pdep, cnp, ndirent.de_Name); 175 if (error) 176 goto bad; 177 178 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 179 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 180 ndirent.de_LowerCase = 0; 181 ndirent.de_StartCluster = 0; 182 ndirent.de_FileSize = 0; 183 ndirent.de_dev = pdep->de_dev; 184 ndirent.de_pmp = pdep->de_pmp; 185 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 186 getnanotime(&ts); 187 DETIMES(&ndirent, &ts, &ts, &ts); 188 error = createde(&ndirent, pdep, &dep, cnp); 189 if (error) 190 goto bad; 191 *ap->a_vpp = DETOV(dep); 192 return (0); 193 194 bad: 195 return (error); 196 } 197 198 static int 199 msdosfs_mknod(ap) 200 struct vop_mknod_args /* { 201 struct vnode *a_dvp; 202 struct vnode **a_vpp; 203 struct componentname *a_cnp; 204 struct vattr *a_vap; 205 } */ *ap; 206 { 207 208 return (EINVAL); 209 } 210 211 static int 212 msdosfs_open(ap) 213 struct vop_open_args /* { 214 struct vnode *a_vp; 215 int a_mode; 216 struct ucred *a_cred; 217 struct thread *a_td; 218 int a_fdidx; 219 } */ *ap; 220 { 221 struct denode *dep = VTODE(ap->a_vp); 222 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 223 return 0; 224 } 225 226 static int 227 msdosfs_close(ap) 228 struct vop_close_args /* { 229 struct vnode *a_vp; 230 int a_fflag; 231 struct ucred *a_cred; 232 struct thread *a_td; 233 } */ *ap; 234 { 235 struct vnode *vp = ap->a_vp; 236 struct denode *dep = VTODE(vp); 237 struct timespec ts; 238 239 VI_LOCK(vp); 240 if (vp->v_usecount > 1) { 241 getnanotime(&ts); 242 DETIMES(dep, &ts, &ts, &ts); 243 } 244 VI_UNLOCK(vp); 245 return 0; 246 } 247 248 static int 249 msdosfs_access(ap) 250 struct vop_access_args /* { 251 struct vnode *a_vp; 252 int a_mode; 253 struct ucred *a_cred; 254 struct thread *a_td; 255 } */ *ap; 256 { 257 struct vnode *vp = ap->a_vp; 258 struct denode *dep = VTODE(ap->a_vp); 259 struct msdosfsmount *pmp = dep->de_pmp; 260 mode_t file_mode, mode = ap->a_mode; 261 262 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 263 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 264 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 265 266 /* 267 * Disallow writing to directories and regular files if the 268 * filesystem is read-only. 269 */ 270 if (mode & VWRITE) { 271 switch (vp->v_type) { 272 case VDIR: 273 case VREG: 274 if (vp->v_mount->mnt_flag & MNT_RDONLY) 275 return (EROFS); 276 break; 277 default: 278 break; 279 } 280 } 281 282 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 283 ap->a_mode, ap->a_cred, NULL)); 284 } 285 286 static int 287 msdosfs_getattr(ap) 288 struct vop_getattr_args /* { 289 struct vnode *a_vp; 290 struct vattr *a_vap; 291 struct ucred *a_cred; 292 struct thread *a_td; 293 } */ *ap; 294 { 295 struct denode *dep = VTODE(ap->a_vp); 296 struct msdosfsmount *pmp = dep->de_pmp; 297 struct vattr *vap = ap->a_vap; 298 mode_t mode; 299 struct timespec ts; 300 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 301 uint64_t fileid; 302 303 getnanotime(&ts); 304 DETIMES(dep, &ts, &ts, &ts); 305 vap->va_fsid = dev2udev(dep->de_dev); 306 /* 307 * The following computation of the fileid must be the same as that 308 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 309 * doesn't work. 310 */ 311 if (dep->de_Attributes & ATTR_DIRECTORY) { 312 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 313 dirsperblk; 314 if (dep->de_StartCluster == MSDOSFSROOT) 315 fileid = 1; 316 } else { 317 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 318 dirsperblk; 319 if (dep->de_dirclust == MSDOSFSROOT) 320 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 321 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 322 } 323 324 if (pmp->pm_flags & MSDOSFS_LARGEFS) 325 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 326 else 327 vap->va_fileid = (long)fileid; 328 329 if ((dep->de_Attributes & ATTR_READONLY) == 0) 330 mode = S_IRWXU|S_IRWXG|S_IRWXO; 331 else 332 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 333 vap->va_mode = mode & 334 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 335 vap->va_uid = pmp->pm_uid; 336 vap->va_gid = pmp->pm_gid; 337 vap->va_nlink = 1; 338 vap->va_rdev = 0; 339 vap->va_size = dep->de_FileSize; 340 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 341 vap->va_ctime = vap->va_mtime; 342 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 343 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 344 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 345 0, &vap->va_birthtime); 346 } else { 347 vap->va_atime = vap->va_mtime; 348 vap->va_birthtime.tv_sec = -1; 349 vap->va_birthtime.tv_nsec = 0; 350 } 351 vap->va_flags = 0; 352 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 353 vap->va_flags |= SF_ARCHIVED; 354 vap->va_gen = 0; 355 vap->va_blocksize = pmp->pm_bpcluster; 356 vap->va_bytes = 357 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 358 vap->va_type = ap->a_vp->v_type; 359 vap->va_filerev = dep->de_modrev; 360 return (0); 361 } 362 363 static int 364 msdosfs_setattr(ap) 365 struct vop_setattr_args /* { 366 struct vnode *a_vp; 367 struct vattr *a_vap; 368 struct ucred *a_cred; 369 struct thread *a_td; 370 } */ *ap; 371 { 372 struct vnode *vp = ap->a_vp; 373 struct denode *dep = VTODE(ap->a_vp); 374 struct msdosfsmount *pmp = dep->de_pmp; 375 struct vattr *vap = ap->a_vap; 376 struct ucred *cred = ap->a_cred; 377 int error = 0; 378 379 #ifdef MSDOSFS_DEBUG 380 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 381 ap->a_vp, vap, cred, ap->a_td); 382 #endif 383 384 /* 385 * Check for unsettable attributes. 386 */ 387 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 388 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 389 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 390 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 391 #ifdef MSDOSFS_DEBUG 392 printf("msdosfs_setattr(): returning EINVAL\n"); 393 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 394 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 395 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 396 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 397 printf(" va_uid %x, va_gid %x\n", 398 vap->va_uid, vap->va_gid); 399 #endif 400 return (EINVAL); 401 } 402 if (vap->va_flags != VNOVAL) { 403 if (vp->v_mount->mnt_flag & MNT_RDONLY) 404 return (EROFS); 405 if (cred->cr_uid != pmp->pm_uid) { 406 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 407 if (error) 408 return (error); 409 } 410 /* 411 * We are very inconsistent about handling unsupported 412 * attributes. We ignored the access time and the 413 * read and execute bits. We were strict for the other 414 * attributes. 415 * 416 * Here we are strict, stricter than ufs in not allowing 417 * users to attempt to set SF_SETTABLE bits or anyone to 418 * set unsupported bits. However, we ignore attempts to 419 * set ATTR_ARCHIVE for directories `cp -pr' from a more 420 * sensible filesystem attempts it a lot. 421 */ 422 if (vap->va_flags & SF_SETTABLE) { 423 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0); 424 if (error) 425 return (error); 426 } 427 if (vap->va_flags & ~SF_ARCHIVED) 428 return EOPNOTSUPP; 429 if (vap->va_flags & SF_ARCHIVED) 430 dep->de_Attributes &= ~ATTR_ARCHIVE; 431 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 432 dep->de_Attributes |= ATTR_ARCHIVE; 433 dep->de_flag |= DE_MODIFIED; 434 } 435 436 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 437 uid_t uid; 438 gid_t gid; 439 440 if (vp->v_mount->mnt_flag & MNT_RDONLY) 441 return (EROFS); 442 uid = vap->va_uid; 443 if (uid == (uid_t)VNOVAL) 444 uid = pmp->pm_uid; 445 gid = vap->va_gid; 446 if (gid == (gid_t)VNOVAL) 447 gid = pmp->pm_gid; 448 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 449 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 450 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 451 if (error) 452 return (error); 453 } 454 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 455 return EINVAL; 456 } 457 458 if (vap->va_size != VNOVAL) { 459 switch (vp->v_type) { 460 case VDIR: 461 return (EISDIR); 462 case VREG: 463 /* 464 * Truncation is only supported for regular files, 465 * Disallow it if the filesystem is read-only. 466 */ 467 if (vp->v_mount->mnt_flag & MNT_RDONLY) 468 return (EROFS); 469 break; 470 default: 471 /* 472 * According to POSIX, the result is unspecified 473 * for file types other than regular files, 474 * directories and shared memory objects. We 475 * don't support any file types except regular 476 * files and directories in this file system, so 477 * this (default) case is unreachable and can do 478 * anything. Keep falling through to detrunc() 479 * for now. 480 */ 481 break; 482 } 483 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td); 484 if (error) 485 return error; 486 } 487 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 488 if (vp->v_mount->mnt_flag & MNT_RDONLY) 489 return (EROFS); 490 if (vap->va_vaflags & VA_UTIMES_NULL) { 491 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td); 492 if (error) 493 error = VOP_ACCESS(vp, VWRITE, cred, 494 ap->a_td); 495 } else 496 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td); 497 if (vp->v_type != VDIR) { 498 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 499 vap->va_atime.tv_sec != VNOVAL) { 500 dep->de_flag &= ~DE_ACCESS; 501 timespec2fattime(&vap->va_atime, 0, 502 &dep->de_ADate, NULL, NULL); 503 } 504 if (vap->va_mtime.tv_sec != VNOVAL) { 505 dep->de_flag &= ~DE_UPDATE; 506 timespec2fattime(&vap->va_mtime, 0, 507 &dep->de_MDate, &dep->de_MTime, NULL); 508 } 509 dep->de_Attributes |= ATTR_ARCHIVE; 510 dep->de_flag |= DE_MODIFIED; 511 } 512 } 513 /* 514 * DOS files only have the ability to have their writability 515 * attribute set, so we use the owner write bit to set the readonly 516 * attribute. 517 */ 518 if (vap->va_mode != (mode_t)VNOVAL) { 519 if (vp->v_mount->mnt_flag & MNT_RDONLY) 520 return (EROFS); 521 if (cred->cr_uid != pmp->pm_uid) { 522 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 523 if (error) 524 return (error); 525 } 526 if (vp->v_type != VDIR) { 527 /* We ignore the read and execute bits. */ 528 if (vap->va_mode & VWRITE) 529 dep->de_Attributes &= ~ATTR_READONLY; 530 else 531 dep->de_Attributes |= ATTR_READONLY; 532 dep->de_Attributes |= ATTR_ARCHIVE; 533 dep->de_flag |= DE_MODIFIED; 534 } 535 } 536 return (deupdat(dep, 0)); 537 } 538 539 static int 540 msdosfs_read(ap) 541 struct vop_read_args /* { 542 struct vnode *a_vp; 543 struct uio *a_uio; 544 int a_ioflag; 545 struct ucred *a_cred; 546 } */ *ap; 547 { 548 int error = 0; 549 int blsize; 550 int isadir; 551 int orig_resid; 552 u_int n; 553 u_long diff; 554 u_long on; 555 daddr_t lbn; 556 daddr_t rablock; 557 int rasize; 558 int seqcount; 559 struct buf *bp; 560 struct vnode *vp = ap->a_vp; 561 struct denode *dep = VTODE(vp); 562 struct msdosfsmount *pmp = dep->de_pmp; 563 struct uio *uio = ap->a_uio; 564 565 /* 566 * If they didn't ask for any data, then we are done. 567 */ 568 orig_resid = uio->uio_resid; 569 if (orig_resid == 0) 570 return (0); 571 572 /* 573 * The caller is supposed to ensure that 574 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 575 * We don't need to check for large offsets as in ffs because 576 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large 577 * offsets cannot cause overflow even in theory. 578 */ 579 580 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 581 582 isadir = dep->de_Attributes & ATTR_DIRECTORY; 583 do { 584 if (uio->uio_offset >= dep->de_FileSize) 585 break; 586 lbn = de_cluster(pmp, uio->uio_offset); 587 rablock = lbn + 1; 588 blsize = pmp->pm_bpcluster; 589 on = uio->uio_offset & pmp->pm_crbomask; 590 /* 591 * If we are operating on a directory file then be sure to 592 * do i/o with the vnode for the filesystem instead of the 593 * vnode for the directory. 594 */ 595 if (isadir) { 596 /* convert cluster # to block # */ 597 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 598 if (error == E2BIG) { 599 error = EINVAL; 600 break; 601 } else if (error) 602 break; 603 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 604 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 605 error = bread(vp, lbn, blsize, NOCRED, &bp); 606 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 607 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 608 NOCRED, on + uio->uio_resid, seqcount, &bp); 609 } else if (seqcount > 1) { 610 rasize = blsize; 611 error = breadn(vp, lbn, 612 blsize, &rablock, &rasize, 1, NOCRED, &bp); 613 } else { 614 error = bread(vp, lbn, blsize, NOCRED, &bp); 615 } 616 if (error) { 617 brelse(bp); 618 break; 619 } 620 diff = pmp->pm_bpcluster - on; 621 n = diff > uio->uio_resid ? uio->uio_resid : diff; 622 diff = dep->de_FileSize - uio->uio_offset; 623 if (diff < n) 624 n = diff; 625 diff = blsize - bp->b_resid; 626 if (diff < n) 627 n = diff; 628 error = uiomove(bp->b_data + on, (int) n, uio); 629 brelse(bp); 630 } while (error == 0 && uio->uio_resid > 0 && n != 0); 631 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 632 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 633 dep->de_flag |= DE_ACCESS; 634 return (error); 635 } 636 637 /* 638 * Write data to a file or directory. 639 */ 640 static int 641 msdosfs_write(ap) 642 struct vop_write_args /* { 643 struct vnode *a_vp; 644 struct uio *a_uio; 645 int a_ioflag; 646 struct ucred *a_cred; 647 } */ *ap; 648 { 649 int n; 650 int croffset; 651 int resid; 652 u_long osize; 653 int error = 0; 654 u_long count; 655 int seqcount; 656 daddr_t bn, lastcn; 657 struct buf *bp; 658 int ioflag = ap->a_ioflag; 659 struct uio *uio = ap->a_uio; 660 struct thread *td = uio->uio_td; 661 struct vnode *vp = ap->a_vp; 662 struct vnode *thisvp; 663 struct denode *dep = VTODE(vp); 664 struct msdosfsmount *pmp = dep->de_pmp; 665 struct ucred *cred = ap->a_cred; 666 667 #ifdef MSDOSFS_DEBUG 668 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 669 vp, uio, ioflag, cred); 670 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 671 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 672 #endif 673 674 switch (vp->v_type) { 675 case VREG: 676 if (ioflag & IO_APPEND) 677 uio->uio_offset = dep->de_FileSize; 678 thisvp = vp; 679 break; 680 case VDIR: 681 return EISDIR; 682 default: 683 panic("msdosfs_write(): bad file type"); 684 } 685 686 /* 687 * This is needed (unlike in ffs_write()) because we extend the 688 * file outside of the loop but we don't want to extend the file 689 * for writes of 0 bytes. 690 */ 691 if (uio->uio_resid == 0) 692 return (0); 693 694 /* 695 * The caller is supposed to ensure that 696 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 697 */ 698 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 699 return (EFBIG); 700 701 /* 702 * If they've exceeded their filesize limit, tell them about it. 703 */ 704 if (td != NULL) { 705 PROC_LOCK(td->td_proc); 706 if ((uoff_t)uio->uio_offset + uio->uio_resid > 707 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 708 psignal(td->td_proc, SIGXFSZ); 709 PROC_UNLOCK(td->td_proc); 710 return (EFBIG); 711 } 712 PROC_UNLOCK(td->td_proc); 713 } 714 715 /* 716 * If the offset we are starting the write at is beyond the end of 717 * the file, then they've done a seek. Unix filesystems allow 718 * files with holes in them, DOS doesn't so we must fill the hole 719 * with zeroed blocks. 720 */ 721 if (uio->uio_offset > dep->de_FileSize) { 722 error = deextend(dep, uio->uio_offset, cred); 723 if (error) 724 return (error); 725 } 726 727 /* 728 * Remember some values in case the write fails. 729 */ 730 resid = uio->uio_resid; 731 osize = dep->de_FileSize; 732 733 /* 734 * If we write beyond the end of the file, extend it to its ultimate 735 * size ahead of the time to hopefully get a contiguous area. 736 */ 737 if (uio->uio_offset + resid > osize) { 738 count = de_clcount(pmp, uio->uio_offset + resid) - 739 de_clcount(pmp, osize); 740 error = extendfile(dep, count, NULL, NULL, 0); 741 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 742 goto errexit; 743 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 744 } else 745 lastcn = de_clcount(pmp, osize) - 1; 746 747 seqcount = ioflag >> IO_SEQSHIFT; 748 do { 749 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 750 error = ENOSPC; 751 break; 752 } 753 754 croffset = uio->uio_offset & pmp->pm_crbomask; 755 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 756 if (uio->uio_offset + n > dep->de_FileSize) { 757 dep->de_FileSize = uio->uio_offset + n; 758 /* The object size needs to be set before buffer is allocated */ 759 vnode_pager_setsize(vp, dep->de_FileSize); 760 } 761 762 bn = de_cluster(pmp, uio->uio_offset); 763 if ((uio->uio_offset & pmp->pm_crbomask) == 0 764 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 765 > de_cluster(pmp, uio->uio_offset) 766 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 767 /* 768 * If either the whole cluster gets written, 769 * or we write the cluster from its start beyond EOF, 770 * then no need to read data from disk. 771 */ 772 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 773 vfs_bio_clrbuf(bp); 774 /* 775 * Do the bmap now, since pcbmap needs buffers 776 * for the fat table. (see msdosfs_strategy) 777 */ 778 if (bp->b_blkno == bp->b_lblkno) { 779 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 780 if (error) 781 bp->b_blkno = -1; 782 else 783 bp->b_blkno = bn; 784 } 785 if (bp->b_blkno == -1) { 786 brelse(bp); 787 if (!error) 788 error = EIO; /* XXX */ 789 break; 790 } 791 } else { 792 /* 793 * The block we need to write into exists, so read it in. 794 */ 795 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 796 if (error) { 797 brelse(bp); 798 break; 799 } 800 } 801 802 /* 803 * Should these vnode_pager_* functions be done on dir 804 * files? 805 */ 806 807 /* 808 * Copy the data from user space into the buf header. 809 */ 810 error = uiomove(bp->b_data + croffset, n, uio); 811 if (error) { 812 brelse(bp); 813 break; 814 } 815 816 /* Prepare for clustered writes in some else clauses. */ 817 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 818 bp->b_flags |= B_CLUSTEROK; 819 820 /* 821 * If IO_SYNC, then each buffer is written synchronously. 822 * Otherwise, if we have a severe page deficiency then 823 * write the buffer asynchronously. Otherwise, if on a 824 * cluster boundary then write the buffer asynchronously, 825 * combining it with contiguous clusters if permitted and 826 * possible, since we don't expect more writes into this 827 * buffer soon. Otherwise, do a delayed write because we 828 * expect more writes into this buffer soon. 829 */ 830 if (ioflag & IO_SYNC) 831 (void)bwrite(bp); 832 else if (vm_page_count_severe() || buf_dirty_count_severe()) 833 bawrite(bp); 834 else if (n + croffset == pmp->pm_bpcluster) { 835 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 836 cluster_write(vp, bp, dep->de_FileSize, 837 seqcount); 838 else 839 bawrite(bp); 840 } else 841 bdwrite(bp); 842 dep->de_flag |= DE_UPDATE; 843 } while (error == 0 && uio->uio_resid > 0); 844 845 /* 846 * If the write failed and they want us to, truncate the file back 847 * to the size it was before the write was attempted. 848 */ 849 errexit: 850 if (error) { 851 if (ioflag & IO_UNIT) { 852 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 853 uio->uio_offset -= resid - uio->uio_resid; 854 uio->uio_resid = resid; 855 } else { 856 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 857 if (uio->uio_resid != resid) 858 error = 0; 859 } 860 } else if (ioflag & IO_SYNC) 861 error = deupdat(dep, 1); 862 return (error); 863 } 864 865 /* 866 * Flush the blocks of a file to disk. 867 * 868 * This function is worthless for vnodes that represent directories. Maybe we 869 * could just do a sync if they try an fsync on a directory file. 870 */ 871 static int 872 msdosfs_fsync(ap) 873 struct vop_fsync_args /* { 874 struct vnode *a_vp; 875 struct ucred *a_cred; 876 int a_waitfor; 877 struct thread *a_td; 878 } */ *ap; 879 { 880 881 vop_stdfsync(ap); 882 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT)); 883 } 884 885 static int 886 msdosfs_remove(ap) 887 struct vop_remove_args /* { 888 struct vnode *a_dvp; 889 struct vnode *a_vp; 890 struct componentname *a_cnp; 891 } */ *ap; 892 { 893 struct denode *dep = VTODE(ap->a_vp); 894 struct denode *ddep = VTODE(ap->a_dvp); 895 int error; 896 897 if (ap->a_vp->v_type == VDIR) 898 error = EPERM; 899 else 900 error = removede(ddep, dep); 901 #ifdef MSDOSFS_DEBUG 902 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 903 #endif 904 return (error); 905 } 906 907 /* 908 * DOS filesystems don't know what links are. 909 */ 910 static int 911 msdosfs_link(ap) 912 struct vop_link_args /* { 913 struct vnode *a_tdvp; 914 struct vnode *a_vp; 915 struct componentname *a_cnp; 916 } */ *ap; 917 { 918 return (EOPNOTSUPP); 919 } 920 921 /* 922 * Renames on files require moving the denode to a new hash queue since the 923 * denode's location is used to compute which hash queue to put the file 924 * in. Unless it is a rename in place. For example "mv a b". 925 * 926 * What follows is the basic algorithm: 927 * 928 * if (file move) { 929 * if (dest file exists) { 930 * remove dest file 931 * } 932 * if (dest and src in same directory) { 933 * rewrite name in existing directory slot 934 * } else { 935 * write new entry in dest directory 936 * update offset and dirclust in denode 937 * move denode to new hash chain 938 * clear old directory entry 939 * } 940 * } else { 941 * directory move 942 * if (dest directory exists) { 943 * if (dest is not empty) { 944 * return ENOTEMPTY 945 * } 946 * remove dest directory 947 * } 948 * if (dest and src in same directory) { 949 * rewrite name in existing entry 950 * } else { 951 * be sure dest is not a child of src directory 952 * write entry in dest directory 953 * update "." and ".." in moved directory 954 * clear old directory entry for moved directory 955 * } 956 * } 957 * 958 * On entry: 959 * source's parent directory is unlocked 960 * source file or directory is unlocked 961 * destination's parent directory is locked 962 * destination file or directory is locked if it exists 963 * 964 * On exit: 965 * all denodes should be released 966 */ 967 static int 968 msdosfs_rename(ap) 969 struct vop_rename_args /* { 970 struct vnode *a_fdvp; 971 struct vnode *a_fvp; 972 struct componentname *a_fcnp; 973 struct vnode *a_tdvp; 974 struct vnode *a_tvp; 975 struct componentname *a_tcnp; 976 } */ *ap; 977 { 978 struct vnode *tdvp = ap->a_tdvp; 979 struct vnode *fvp = ap->a_fvp; 980 struct vnode *fdvp = ap->a_fdvp; 981 struct vnode *tvp = ap->a_tvp; 982 struct componentname *tcnp = ap->a_tcnp; 983 struct componentname *fcnp = ap->a_fcnp; 984 struct denode *ip, *xp, *dp, *zp; 985 u_char toname[11], oldname[11]; 986 u_long from_diroffset, to_diroffset; 987 u_char to_count; 988 int doingdirectory = 0, newparent = 0; 989 int error; 990 u_long cn; 991 daddr_t bn; 992 struct denode *fddep; /* from file's parent directory */ 993 struct msdosfsmount *pmp; 994 struct direntry *dotdotp; 995 struct buf *bp; 996 997 fddep = VTODE(ap->a_fdvp); 998 pmp = fddep->de_pmp; 999 1000 pmp = VFSTOMSDOSFS(fdvp->v_mount); 1001 1002 #ifdef DIAGNOSTIC 1003 if ((tcnp->cn_flags & HASBUF) == 0 || 1004 (fcnp->cn_flags & HASBUF) == 0) 1005 panic("msdosfs_rename: no name"); 1006 #endif 1007 /* 1008 * Check for cross-device rename. 1009 */ 1010 if (fvp->v_mount != tdvp->v_mount || 1011 (tvp && fvp->v_mount != tvp->v_mount)) { 1012 error = EXDEV; 1013 abortit: 1014 if (tdvp == tvp) 1015 vrele(tdvp); 1016 else 1017 vput(tdvp); 1018 if (tvp) 1019 vput(tvp); 1020 vrele(fdvp); 1021 vrele(fvp); 1022 return (error); 1023 } 1024 1025 /* 1026 * If source and dest are the same, do nothing. 1027 */ 1028 if (tvp == fvp) { 1029 error = 0; 1030 goto abortit; 1031 } 1032 1033 error = vn_lock(fvp, LK_EXCLUSIVE); 1034 if (error) 1035 goto abortit; 1036 dp = VTODE(fdvp); 1037 ip = VTODE(fvp); 1038 1039 /* 1040 * Be sure we are not renaming ".", "..", or an alias of ".". This 1041 * leads to a crippled directory tree. It's pretty tough to do a 1042 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1043 * doesn't work if the ".." entry is missing. 1044 */ 1045 if (ip->de_Attributes & ATTR_DIRECTORY) { 1046 /* 1047 * Avoid ".", "..", and aliases of "." for obvious reasons. 1048 */ 1049 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1050 dp == ip || 1051 (fcnp->cn_flags & ISDOTDOT) || 1052 (tcnp->cn_flags & ISDOTDOT) || 1053 (ip->de_flag & DE_RENAME)) { 1054 VOP_UNLOCK(fvp, 0); 1055 error = EINVAL; 1056 goto abortit; 1057 } 1058 ip->de_flag |= DE_RENAME; 1059 doingdirectory++; 1060 } 1061 1062 /* 1063 * When the target exists, both the directory 1064 * and target vnodes are returned locked. 1065 */ 1066 dp = VTODE(tdvp); 1067 xp = tvp ? VTODE(tvp) : NULL; 1068 /* 1069 * Remember direntry place to use for destination 1070 */ 1071 to_diroffset = dp->de_fndoffset; 1072 to_count = dp->de_fndcnt; 1073 1074 /* 1075 * If ".." must be changed (ie the directory gets a new 1076 * parent) then the source directory must not be in the 1077 * directory heirarchy above the target, as this would 1078 * orphan everything below the source directory. Also 1079 * the user must have write permission in the source so 1080 * as to be able to change "..". We must repeat the call 1081 * to namei, as the parent directory is unlocked by the 1082 * call to doscheckpath(). 1083 */ 1084 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1085 VOP_UNLOCK(fvp, 0); 1086 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1087 newparent = 1; 1088 if (doingdirectory && newparent) { 1089 if (error) /* write access check above */ 1090 goto bad; 1091 if (xp != NULL) 1092 vput(tvp); 1093 /* 1094 * doscheckpath() vput()'s dp, 1095 * so we have to do a relookup afterwards 1096 */ 1097 error = doscheckpath(ip, dp); 1098 if (error) 1099 goto out; 1100 if ((tcnp->cn_flags & SAVESTART) == 0) 1101 panic("msdosfs_rename: lost to startdir"); 1102 error = relookup(tdvp, &tvp, tcnp); 1103 if (error) 1104 goto out; 1105 dp = VTODE(tdvp); 1106 xp = tvp ? VTODE(tvp) : NULL; 1107 } 1108 1109 if (xp != NULL) { 1110 /* 1111 * Target must be empty if a directory and have no links 1112 * to it. Also, ensure source and target are compatible 1113 * (both directories, or both not directories). 1114 */ 1115 if (xp->de_Attributes & ATTR_DIRECTORY) { 1116 if (!dosdirempty(xp)) { 1117 error = ENOTEMPTY; 1118 goto bad; 1119 } 1120 if (!doingdirectory) { 1121 error = ENOTDIR; 1122 goto bad; 1123 } 1124 cache_purge(tdvp); 1125 } else if (doingdirectory) { 1126 error = EISDIR; 1127 goto bad; 1128 } 1129 error = removede(dp, xp); 1130 if (error) 1131 goto bad; 1132 vput(tvp); 1133 xp = NULL; 1134 } 1135 1136 /* 1137 * Convert the filename in tcnp into a dos filename. We copy this 1138 * into the denode and directory entry for the destination 1139 * file/directory. 1140 */ 1141 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1142 if (error) 1143 goto abortit; 1144 1145 /* 1146 * Since from wasn't locked at various places above, 1147 * have to do a relookup here. 1148 */ 1149 fcnp->cn_flags &= ~MODMASK; 1150 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1151 if ((fcnp->cn_flags & SAVESTART) == 0) 1152 panic("msdosfs_rename: lost from startdir"); 1153 if (!newparent) 1154 VOP_UNLOCK(tdvp, 0); 1155 if (relookup(fdvp, &fvp, fcnp) == 0) 1156 vrele(fdvp); 1157 if (fvp == NULL) { 1158 /* 1159 * From name has disappeared. 1160 */ 1161 if (doingdirectory) 1162 panic("rename: lost dir entry"); 1163 if (newparent) 1164 VOP_UNLOCK(tdvp, 0); 1165 vrele(tdvp); 1166 vrele(ap->a_fvp); 1167 return 0; 1168 } 1169 xp = VTODE(fvp); 1170 zp = VTODE(fdvp); 1171 from_diroffset = zp->de_fndoffset; 1172 1173 /* 1174 * Ensure that the directory entry still exists and has not 1175 * changed till now. If the source is a file the entry may 1176 * have been unlinked or renamed. In either case there is 1177 * no further work to be done. If the source is a directory 1178 * then it cannot have been rmdir'ed or renamed; this is 1179 * prohibited by the DE_RENAME flag. 1180 */ 1181 if (xp != ip) { 1182 if (doingdirectory) 1183 panic("rename: lost dir entry"); 1184 VOP_UNLOCK(fvp, 0); 1185 if (newparent) 1186 VOP_UNLOCK(fdvp, 0); 1187 vrele(ap->a_fvp); 1188 xp = NULL; 1189 } else { 1190 vrele(fvp); 1191 xp = NULL; 1192 1193 /* 1194 * First write a new entry in the destination 1195 * directory and mark the entry in the source directory 1196 * as deleted. Then move the denode to the correct hash 1197 * chain for its new location in the filesystem. And, if 1198 * we moved a directory, then update its .. entry to point 1199 * to the new parent directory. 1200 */ 1201 bcopy(ip->de_Name, oldname, 11); 1202 bcopy(toname, ip->de_Name, 11); /* update denode */ 1203 dp->de_fndoffset = to_diroffset; 1204 dp->de_fndcnt = to_count; 1205 error = createde(ip, dp, (struct denode **)0, tcnp); 1206 if (error) { 1207 bcopy(oldname, ip->de_Name, 11); 1208 if (newparent) 1209 VOP_UNLOCK(fdvp, 0); 1210 VOP_UNLOCK(fvp, 0); 1211 goto bad; 1212 } 1213 ip->de_refcnt++; 1214 zp->de_fndoffset = from_diroffset; 1215 error = removede(zp, ip); 1216 if (error) { 1217 /* XXX should downgrade to ro here, fs is corrupt */ 1218 if (newparent) 1219 VOP_UNLOCK(fdvp, 0); 1220 VOP_UNLOCK(fvp, 0); 1221 goto bad; 1222 } 1223 if (!doingdirectory) { 1224 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1225 &ip->de_dirclust, 0); 1226 if (error) { 1227 /* XXX should downgrade to ro here, fs is corrupt */ 1228 if (newparent) 1229 VOP_UNLOCK(fdvp, 0); 1230 VOP_UNLOCK(fvp, 0); 1231 goto bad; 1232 } 1233 if (ip->de_dirclust == MSDOSFSROOT) 1234 ip->de_diroffset = to_diroffset; 1235 else 1236 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1237 } 1238 reinsert(ip); 1239 if (newparent) 1240 VOP_UNLOCK(fdvp, 0); 1241 } 1242 1243 /* 1244 * If we moved a directory to a new parent directory, then we must 1245 * fixup the ".." entry in the moved directory. 1246 */ 1247 if (doingdirectory && newparent) { 1248 cn = ip->de_StartCluster; 1249 if (cn == MSDOSFSROOT) { 1250 /* this should never happen */ 1251 panic("msdosfs_rename(): updating .. in root directory?"); 1252 } else 1253 bn = cntobn(pmp, cn); 1254 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1255 NOCRED, &bp); 1256 if (error) { 1257 /* XXX should downgrade to ro here, fs is corrupt */ 1258 brelse(bp); 1259 VOP_UNLOCK(fvp, 0); 1260 goto bad; 1261 } 1262 dotdotp = (struct direntry *)bp->b_data + 1; 1263 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1264 if (FAT32(pmp)) 1265 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1266 if (fvp->v_mount->mnt_flag & MNT_ASYNC) 1267 bdwrite(bp); 1268 else if ((error = bwrite(bp)) != 0) { 1269 /* XXX should downgrade to ro here, fs is corrupt */ 1270 VOP_UNLOCK(fvp, 0); 1271 goto bad; 1272 } 1273 } 1274 1275 VOP_UNLOCK(fvp, 0); 1276 bad: 1277 if (xp) 1278 vput(tvp); 1279 vput(tdvp); 1280 out: 1281 ip->de_flag &= ~DE_RENAME; 1282 vrele(fdvp); 1283 vrele(fvp); 1284 return (error); 1285 1286 } 1287 1288 static struct { 1289 struct direntry dot; 1290 struct direntry dotdot; 1291 } dosdirtemplate = { 1292 { ". ", " ", /* the . entry */ 1293 ATTR_DIRECTORY, /* file attribute */ 1294 0, /* reserved */ 1295 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1296 { 0, 0 }, /* access date */ 1297 { 0, 0 }, /* high bits of start cluster */ 1298 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1299 { 0, 0 }, /* startcluster */ 1300 { 0, 0, 0, 0 } /* filesize */ 1301 }, 1302 { ".. ", " ", /* the .. entry */ 1303 ATTR_DIRECTORY, /* file attribute */ 1304 0, /* reserved */ 1305 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1306 { 0, 0 }, /* access date */ 1307 { 0, 0 }, /* high bits of start cluster */ 1308 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1309 { 0, 0 }, /* startcluster */ 1310 { 0, 0, 0, 0 } /* filesize */ 1311 } 1312 }; 1313 1314 static int 1315 msdosfs_mkdir(ap) 1316 struct vop_mkdir_args /* { 1317 struct vnode *a_dvp; 1318 struct vnode **a_vpp; 1319 struvt componentname *a_cnp; 1320 struct vattr *a_vap; 1321 } */ *ap; 1322 { 1323 struct componentname *cnp = ap->a_cnp; 1324 struct denode *dep; 1325 struct denode *pdep = VTODE(ap->a_dvp); 1326 struct direntry *denp; 1327 struct msdosfsmount *pmp = pdep->de_pmp; 1328 struct buf *bp; 1329 u_long newcluster, pcl; 1330 int bn; 1331 int error; 1332 struct denode ndirent; 1333 struct timespec ts; 1334 1335 /* 1336 * If this is the root directory and there is no space left we 1337 * can't do anything. This is because the root directory can not 1338 * change size. 1339 */ 1340 if (pdep->de_StartCluster == MSDOSFSROOT 1341 && pdep->de_fndoffset >= pdep->de_FileSize) { 1342 error = ENOSPC; 1343 goto bad2; 1344 } 1345 1346 /* 1347 * Allocate a cluster to hold the about to be created directory. 1348 */ 1349 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1350 if (error) 1351 goto bad2; 1352 1353 bzero(&ndirent, sizeof(ndirent)); 1354 ndirent.de_pmp = pmp; 1355 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1356 getnanotime(&ts); 1357 DETIMES(&ndirent, &ts, &ts, &ts); 1358 1359 /* 1360 * Now fill the cluster with the "." and ".." entries. And write 1361 * the cluster to disk. This way it is there for the parent 1362 * directory to be pointing at if there were a crash. 1363 */ 1364 bn = cntobn(pmp, newcluster); 1365 /* always succeeds */ 1366 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1367 bzero(bp->b_data, pmp->pm_bpcluster); 1368 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1369 denp = (struct direntry *)bp->b_data; 1370 putushort(denp[0].deStartCluster, newcluster); 1371 putushort(denp[0].deCDate, ndirent.de_CDate); 1372 putushort(denp[0].deCTime, ndirent.de_CTime); 1373 denp[0].deCHundredth = ndirent.de_CHun; 1374 putushort(denp[0].deADate, ndirent.de_ADate); 1375 putushort(denp[0].deMDate, ndirent.de_MDate); 1376 putushort(denp[0].deMTime, ndirent.de_MTime); 1377 pcl = pdep->de_StartCluster; 1378 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1379 pcl = 0; 1380 putushort(denp[1].deStartCluster, pcl); 1381 putushort(denp[1].deCDate, ndirent.de_CDate); 1382 putushort(denp[1].deCTime, ndirent.de_CTime); 1383 denp[1].deCHundredth = ndirent.de_CHun; 1384 putushort(denp[1].deADate, ndirent.de_ADate); 1385 putushort(denp[1].deMDate, ndirent.de_MDate); 1386 putushort(denp[1].deMTime, ndirent.de_MTime); 1387 if (FAT32(pmp)) { 1388 putushort(denp[0].deHighClust, newcluster >> 16); 1389 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1390 } 1391 1392 if (ap->a_dvp->v_mount->mnt_flag & MNT_ASYNC) 1393 bdwrite(bp); 1394 else if ((error = bwrite(bp)) != 0) 1395 goto bad; 1396 1397 /* 1398 * Now build up a directory entry pointing to the newly allocated 1399 * cluster. This will be written to an empty slot in the parent 1400 * directory. 1401 */ 1402 #ifdef DIAGNOSTIC 1403 if ((cnp->cn_flags & HASBUF) == 0) 1404 panic("msdosfs_mkdir: no name"); 1405 #endif 1406 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1407 if (error) 1408 goto bad; 1409 1410 ndirent.de_Attributes = ATTR_DIRECTORY; 1411 ndirent.de_LowerCase = 0; 1412 ndirent.de_StartCluster = newcluster; 1413 ndirent.de_FileSize = 0; 1414 ndirent.de_dev = pdep->de_dev; 1415 error = createde(&ndirent, pdep, &dep, cnp); 1416 if (error) 1417 goto bad; 1418 *ap->a_vpp = DETOV(dep); 1419 return (0); 1420 1421 bad: 1422 clusterfree(pmp, newcluster, NULL); 1423 bad2: 1424 return (error); 1425 } 1426 1427 static int 1428 msdosfs_rmdir(ap) 1429 struct vop_rmdir_args /* { 1430 struct vnode *a_dvp; 1431 struct vnode *a_vp; 1432 struct componentname *a_cnp; 1433 } */ *ap; 1434 { 1435 struct vnode *vp = ap->a_vp; 1436 struct vnode *dvp = ap->a_dvp; 1437 struct componentname *cnp = ap->a_cnp; 1438 struct denode *ip, *dp; 1439 struct thread *td = cnp->cn_thread; 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 VOP_UNLOCK(dvp, 0); 1475 /* 1476 * Truncate the directory that is being deleted. 1477 */ 1478 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td); 1479 cache_purge(vp); 1480 1481 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1482 out: 1483 return (error); 1484 } 1485 1486 /* 1487 * DOS filesystems don't know what symlinks are. 1488 */ 1489 static int 1490 msdosfs_symlink(ap) 1491 struct vop_symlink_args /* { 1492 struct vnode *a_dvp; 1493 struct vnode **a_vpp; 1494 struct componentname *a_cnp; 1495 struct vattr *a_vap; 1496 char *a_target; 1497 } */ *ap; 1498 { 1499 return (EOPNOTSUPP); 1500 } 1501 1502 static int 1503 msdosfs_readdir(ap) 1504 struct vop_readdir_args /* { 1505 struct vnode *a_vp; 1506 struct uio *a_uio; 1507 struct ucred *a_cred; 1508 int *a_eofflag; 1509 int *a_ncookies; 1510 u_long **a_cookies; 1511 } */ *ap; 1512 { 1513 struct mbnambuf nb; 1514 int error = 0; 1515 int diff; 1516 long n; 1517 int blsize; 1518 long on; 1519 u_long cn; 1520 uint64_t fileno; 1521 u_long dirsperblk; 1522 long bias = 0; 1523 daddr_t bn, lbn; 1524 struct buf *bp; 1525 struct denode *dep = VTODE(ap->a_vp); 1526 struct msdosfsmount *pmp = dep->de_pmp; 1527 struct direntry *dentp; 1528 struct dirent dirbuf; 1529 struct uio *uio = ap->a_uio; 1530 u_long *cookies = NULL; 1531 int ncookies = 0; 1532 off_t offset, off; 1533 int chksum = -1; 1534 1535 #ifdef MSDOSFS_DEBUG 1536 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1537 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1538 #endif 1539 1540 /* 1541 * msdosfs_readdir() won't operate properly on regular files since 1542 * it does i/o only with the the filesystem vnode, and hence can 1543 * retrieve the wrong block from the buffer cache for a plain file. 1544 * So, fail attempts to readdir() on a plain file. 1545 */ 1546 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1547 return (ENOTDIR); 1548 1549 /* 1550 * To be safe, initialize dirbuf 1551 */ 1552 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1553 1554 /* 1555 * If the user buffer is smaller than the size of one dos directory 1556 * entry or the file offset is not a multiple of the size of a 1557 * directory entry, then we fail the read. 1558 */ 1559 off = offset = uio->uio_offset; 1560 if (uio->uio_resid < sizeof(struct direntry) || 1561 (offset & (sizeof(struct direntry) - 1))) 1562 return (EINVAL); 1563 1564 if (ap->a_ncookies) { 1565 ncookies = uio->uio_resid / 16; 1566 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1567 M_WAITOK); 1568 *ap->a_cookies = cookies; 1569 *ap->a_ncookies = ncookies; 1570 } 1571 1572 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1573 1574 /* 1575 * If they are reading from the root directory then, we simulate 1576 * the . and .. entries since these don't exist in the root 1577 * directory. We also set the offset bias to make up for having to 1578 * simulate these entries. By this I mean that at file offset 64 we 1579 * read the first entry in the root directory that lives on disk. 1580 */ 1581 if (dep->de_StartCluster == MSDOSFSROOT 1582 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1583 #if 0 1584 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1585 offset); 1586 #endif 1587 bias = 2 * sizeof(struct direntry); 1588 if (offset < bias) { 1589 for (n = (int)offset / sizeof(struct direntry); 1590 n < 2; n++) { 1591 if (FAT32(pmp)) 1592 fileno = (uint64_t)cntobn(pmp, 1593 pmp->pm_rootdirblk) 1594 * dirsperblk; 1595 else 1596 fileno = 1; 1597 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1598 dirbuf.d_fileno = 1599 msdosfs_fileno_map(pmp->pm_mountp, 1600 fileno); 1601 } else { 1602 1603 dirbuf.d_fileno = (uint32_t)fileno; 1604 } 1605 dirbuf.d_type = DT_DIR; 1606 switch (n) { 1607 case 0: 1608 dirbuf.d_namlen = 1; 1609 strcpy(dirbuf.d_name, "."); 1610 break; 1611 case 1: 1612 dirbuf.d_namlen = 2; 1613 strcpy(dirbuf.d_name, ".."); 1614 break; 1615 } 1616 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1617 if (uio->uio_resid < dirbuf.d_reclen) 1618 goto out; 1619 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1620 if (error) 1621 goto out; 1622 offset += sizeof(struct direntry); 1623 off = offset; 1624 if (cookies) { 1625 *cookies++ = offset; 1626 if (--ncookies <= 0) 1627 goto out; 1628 } 1629 } 1630 } 1631 } 1632 1633 mbnambuf_init(&nb); 1634 off = offset; 1635 while (uio->uio_resid > 0) { 1636 lbn = de_cluster(pmp, offset - bias); 1637 on = (offset - bias) & pmp->pm_crbomask; 1638 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1639 diff = dep->de_FileSize - (offset - bias); 1640 if (diff <= 0) 1641 break; 1642 n = min(n, diff); 1643 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1644 if (error) 1645 break; 1646 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1647 if (error) { 1648 brelse(bp); 1649 return (error); 1650 } 1651 n = min(n, blsize - bp->b_resid); 1652 if (n == 0) { 1653 brelse(bp); 1654 return (EIO); 1655 } 1656 1657 /* 1658 * Convert from dos directory entries to fs-independent 1659 * directory entries. 1660 */ 1661 for (dentp = (struct direntry *)(bp->b_data + on); 1662 (char *)dentp < bp->b_data + on + n; 1663 dentp++, offset += sizeof(struct direntry)) { 1664 #if 0 1665 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1666 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1667 #endif 1668 /* 1669 * If this is an unused entry, we can stop. 1670 */ 1671 if (dentp->deName[0] == SLOT_EMPTY) { 1672 brelse(bp); 1673 goto out; 1674 } 1675 /* 1676 * Skip deleted entries. 1677 */ 1678 if (dentp->deName[0] == SLOT_DELETED) { 1679 chksum = -1; 1680 mbnambuf_init(&nb); 1681 continue; 1682 } 1683 1684 /* 1685 * Handle Win95 long directory entries 1686 */ 1687 if (dentp->deAttributes == ATTR_WIN95) { 1688 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1689 continue; 1690 chksum = win2unixfn(&nb, 1691 (struct winentry *)dentp, chksum, pmp); 1692 continue; 1693 } 1694 1695 /* 1696 * Skip volume labels 1697 */ 1698 if (dentp->deAttributes & ATTR_VOLUME) { 1699 chksum = -1; 1700 mbnambuf_init(&nb); 1701 continue; 1702 } 1703 /* 1704 * This computation of d_fileno must match 1705 * the computation of va_fileid in 1706 * msdosfs_getattr. 1707 */ 1708 if (dentp->deAttributes & ATTR_DIRECTORY) { 1709 fileno = getushort(dentp->deStartCluster); 1710 if (FAT32(pmp)) 1711 fileno |= getushort(dentp->deHighClust) << 16; 1712 /* if this is the root directory */ 1713 if (fileno == MSDOSFSROOT) 1714 if (FAT32(pmp)) 1715 fileno = (uint64_t)cntobn(pmp, 1716 pmp->pm_rootdirblk) 1717 * dirsperblk; 1718 else 1719 fileno = 1; 1720 else 1721 fileno = (uint64_t)cntobn(pmp, fileno) * 1722 dirsperblk; 1723 dirbuf.d_type = DT_DIR; 1724 } else { 1725 fileno = (uoff_t)offset / 1726 sizeof(struct direntry); 1727 dirbuf.d_type = DT_REG; 1728 } 1729 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1730 dirbuf.d_fileno = 1731 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1732 } else 1733 dirbuf.d_fileno = (uint32_t)fileno; 1734 1735 if (chksum != winChksum(dentp)) { 1736 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1737 (u_char *)dirbuf.d_name, 1738 dentp->deLowerCase | 1739 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1740 (LCASE_BASE | LCASE_EXT) : 0), 1741 pmp); 1742 mbnambuf_init(&nb); 1743 } else 1744 mbnambuf_flush(&nb, &dirbuf); 1745 chksum = -1; 1746 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1747 if (uio->uio_resid < dirbuf.d_reclen) { 1748 brelse(bp); 1749 goto out; 1750 } 1751 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1752 if (error) { 1753 brelse(bp); 1754 goto out; 1755 } 1756 if (cookies) { 1757 *cookies++ = offset + sizeof(struct direntry); 1758 if (--ncookies <= 0) { 1759 brelse(bp); 1760 goto out; 1761 } 1762 } 1763 off = offset + sizeof(struct direntry); 1764 } 1765 brelse(bp); 1766 } 1767 out: 1768 /* Subtract unused cookies */ 1769 if (ap->a_ncookies) 1770 *ap->a_ncookies -= ncookies; 1771 1772 uio->uio_offset = off; 1773 1774 /* 1775 * Set the eofflag (NFS uses it) 1776 */ 1777 if (ap->a_eofflag) { 1778 if (dep->de_FileSize - (offset - bias) <= 0) 1779 *ap->a_eofflag = 1; 1780 else 1781 *ap->a_eofflag = 0; 1782 } 1783 return (error); 1784 } 1785 1786 /*- 1787 * a_vp - pointer to the file's vnode 1788 * a_bn - logical block number within the file (cluster number for us) 1789 * a_bop - where to return the bufobj of the special file containing the fs 1790 * a_bnp - where to return the "physical" block number corresponding to a_bn 1791 * (relative to the special file; units are blocks of size DEV_BSIZE) 1792 * a_runp - where to return the "run past" a_bn. This is the count of logical 1793 * blocks whose physical blocks (together with a_bn's physical block) 1794 * are contiguous. 1795 * a_runb - where to return the "run before" a_bn. 1796 */ 1797 static int 1798 msdosfs_bmap(ap) 1799 struct vop_bmap_args /* { 1800 struct vnode *a_vp; 1801 daddr_t a_bn; 1802 struct bufobj **a_bop; 1803 daddr_t *a_bnp; 1804 int *a_runp; 1805 int *a_runb; 1806 } */ *ap; 1807 { 1808 struct denode *dep; 1809 struct mount *mp; 1810 struct msdosfsmount *pmp; 1811 struct vnode *vp; 1812 daddr_t runbn; 1813 u_long cn; 1814 int bnpercn, error, maxio, maxrun, run; 1815 1816 vp = ap->a_vp; 1817 dep = VTODE(vp); 1818 pmp = dep->de_pmp; 1819 if (ap->a_bop != NULL) 1820 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1821 if (ap->a_bnp == NULL) 1822 return (0); 1823 if (ap->a_runp != NULL) 1824 *ap->a_runp = 0; 1825 if (ap->a_runb != NULL) 1826 *ap->a_runb = 0; 1827 cn = ap->a_bn; 1828 if (cn != ap->a_bn) 1829 return (EFBIG); 1830 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1831 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1832 return (error); 1833 1834 mp = vp->v_mount; 1835 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1836 bnpercn = de_cn2bn(pmp, 1); 1837 if (ap->a_runp != NULL) { 1838 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1839 for (run = 1; run <= maxrun; run++) { 1840 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1841 runbn != *ap->a_bnp + run * bnpercn) 1842 break; 1843 } 1844 *ap->a_runp = run - 1; 1845 } 1846 if (ap->a_runb != NULL) { 1847 maxrun = ulmin(maxio - 1, cn); 1848 for (run = 1; run < maxrun; run++) { 1849 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1850 runbn != *ap->a_bnp - run * bnpercn) 1851 break; 1852 } 1853 *ap->a_runb = run - 1; 1854 } 1855 return (0); 1856 } 1857 1858 static int 1859 msdosfs_strategy(ap) 1860 struct vop_strategy_args /* { 1861 struct vnode *a_vp; 1862 struct buf *a_bp; 1863 } */ *ap; 1864 { 1865 struct buf *bp = ap->a_bp; 1866 struct denode *dep = VTODE(ap->a_vp); 1867 struct bufobj *bo; 1868 int error = 0; 1869 daddr_t blkno; 1870 1871 /* 1872 * If we don't already know the filesystem relative block number 1873 * then get it using pcbmap(). If pcbmap() returns the block 1874 * number as -1 then we've got a hole in the file. DOS filesystems 1875 * don't allow files with holes, so we shouldn't ever see this. 1876 */ 1877 if (bp->b_blkno == bp->b_lblkno) { 1878 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1879 bp->b_blkno = blkno; 1880 if (error) { 1881 bp->b_error = error; 1882 bp->b_ioflags |= BIO_ERROR; 1883 bufdone(bp); 1884 return (error); 1885 } 1886 if ((long)bp->b_blkno == -1) 1887 vfs_bio_clrbuf(bp); 1888 } 1889 if (bp->b_blkno == -1) { 1890 bufdone(bp); 1891 return (0); 1892 } 1893 /* 1894 * Read/write the block from/to the disk that contains the desired 1895 * file block. 1896 */ 1897 bp->b_iooffset = dbtob(bp->b_blkno); 1898 bo = dep->de_pmp->pm_bo; 1899 BO_STRATEGY(bo, bp); 1900 return (0); 1901 } 1902 1903 static int 1904 msdosfs_print(ap) 1905 struct vop_print_args /* { 1906 struct vnode *vp; 1907 } */ *ap; 1908 { 1909 struct denode *dep = VTODE(ap->a_vp); 1910 1911 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1912 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1913 printf("on dev %s\n", devtoname(dep->de_dev)); 1914 return (0); 1915 } 1916 1917 static int 1918 msdosfs_pathconf(ap) 1919 struct vop_pathconf_args /* { 1920 struct vnode *a_vp; 1921 int a_name; 1922 int *a_retval; 1923 } */ *ap; 1924 { 1925 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1926 1927 switch (ap->a_name) { 1928 case _PC_LINK_MAX: 1929 *ap->a_retval = 1; 1930 return (0); 1931 case _PC_NAME_MAX: 1932 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1933 return (0); 1934 case _PC_PATH_MAX: 1935 *ap->a_retval = PATH_MAX; 1936 return (0); 1937 case _PC_CHOWN_RESTRICTED: 1938 *ap->a_retval = 1; 1939 return (0); 1940 case _PC_NO_TRUNC: 1941 *ap->a_retval = 0; 1942 return (0); 1943 default: 1944 return (EINVAL); 1945 } 1946 /* NOTREACHED */ 1947 } 1948 1949 static int 1950 msdosfs_vptofh(ap) 1951 struct vop_vptofh_args /* { 1952 struct vnode *a_vp; 1953 struct fid *a_fhp; 1954 } */ *ap; 1955 { 1956 struct denode *dep; 1957 struct defid *defhp; 1958 1959 dep = VTODE(ap->a_vp); 1960 defhp = (struct defid *)ap->a_fhp; 1961 defhp->defid_len = sizeof(struct defid); 1962 defhp->defid_dirclust = dep->de_dirclust; 1963 defhp->defid_dirofs = dep->de_diroffset; 1964 /* defhp->defid_gen = dep->de_gen; */ 1965 return (0); 1966 } 1967 1968 /* Global vfs data structures for msdosfs */ 1969 struct vop_vector msdosfs_vnodeops = { 1970 .vop_default = &default_vnodeops, 1971 1972 .vop_access = msdosfs_access, 1973 .vop_bmap = msdosfs_bmap, 1974 .vop_cachedlookup = msdosfs_lookup, 1975 .vop_open = msdosfs_open, 1976 .vop_close = msdosfs_close, 1977 .vop_create = msdosfs_create, 1978 .vop_fsync = msdosfs_fsync, 1979 .vop_getattr = msdosfs_getattr, 1980 .vop_inactive = msdosfs_inactive, 1981 .vop_link = msdosfs_link, 1982 .vop_lookup = vfs_cache_lookup, 1983 .vop_mkdir = msdosfs_mkdir, 1984 .vop_mknod = msdosfs_mknod, 1985 .vop_pathconf = msdosfs_pathconf, 1986 .vop_print = msdosfs_print, 1987 .vop_read = msdosfs_read, 1988 .vop_readdir = msdosfs_readdir, 1989 .vop_reclaim = msdosfs_reclaim, 1990 .vop_remove = msdosfs_remove, 1991 .vop_rename = msdosfs_rename, 1992 .vop_rmdir = msdosfs_rmdir, 1993 .vop_setattr = msdosfs_setattr, 1994 .vop_strategy = msdosfs_strategy, 1995 .vop_symlink = msdosfs_symlink, 1996 .vop_write = msdosfs_write, 1997 .vop_vptofh = msdosfs_vptofh, 1998 }; 1999