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