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sys/fs/msdosfs/msdosfs_vnops.c
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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 bzero(&ndirent, sizeof(ndirent)); 169 error = uniqdosname(pdep, cnp, ndirent.de_Name); 170 if (error) 171 goto bad; 172 173 ndirent.de_Attributes = ATTR_ARCHIVE; 174 ndirent.de_LowerCase = 0; 175 ndirent.de_StartCluster = 0; 176 ndirent.de_FileSize = 0; 177 ndirent.de_pmp = pdep->de_pmp; 178 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 179 vfs_timestamp(&ts); 180 DETIMES(&ndirent, &ts, &ts, &ts); 181 error = createde(&ndirent, pdep, &dep, cnp); 182 if (error) 183 goto bad; 184 *ap->a_vpp = DETOV(dep); 185 if ((cnp->cn_flags & MAKEENTRY) != 0) 186 cache_enter(ap->a_dvp, *ap->a_vpp, cnp); 187 return (0); 188 189 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 vfs_timestamp(&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 vfs_timestamp(&ts); 268 DETIMES(dep, &ts, &ts, &ts); 269 vap->va_fsid = dev2udev(pmp->pm_dev); 270 /* 271 * The following computation of the fileid must be the same as that 272 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 273 * doesn't work. 274 */ 275 if (dep->de_Attributes & ATTR_DIRECTORY) { 276 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 277 dirsperblk; 278 if (dep->de_StartCluster == MSDOSFSROOT) 279 fileid = 1; 280 } else { 281 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 282 dirsperblk; 283 if (dep->de_dirclust == MSDOSFSROOT) 284 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 285 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 286 } 287 288 if (pmp->pm_flags & MSDOSFS_LARGEFS) 289 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 290 else 291 vap->va_fileid = (long)fileid; 292 293 mode = S_IRWXU|S_IRWXG|S_IRWXO; 294 vap->va_mode = mode & 295 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 296 vap->va_uid = pmp->pm_uid; 297 vap->va_gid = pmp->pm_gid; 298 vap->va_nlink = 1; 299 vap->va_rdev = NODEV; 300 vap->va_size = dep->de_FileSize; 301 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 302 vap->va_ctime = vap->va_mtime; 303 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 304 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 305 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 306 0, &vap->va_birthtime); 307 } else { 308 vap->va_atime = vap->va_mtime; 309 vap->va_birthtime.tv_sec = -1; 310 vap->va_birthtime.tv_nsec = 0; 311 } 312 vap->va_flags = 0; 313 if (dep->de_Attributes & ATTR_ARCHIVE) 314 vap->va_flags |= UF_ARCHIVE; 315 if (dep->de_Attributes & ATTR_HIDDEN) 316 vap->va_flags |= UF_HIDDEN; 317 if (dep->de_Attributes & ATTR_READONLY) 318 vap->va_flags |= UF_READONLY; 319 if (dep->de_Attributes & ATTR_SYSTEM) 320 vap->va_flags |= UF_SYSTEM; 321 vap->va_gen = 0; 322 vap->va_blocksize = pmp->pm_bpcluster; 323 vap->va_bytes = 324 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 325 vap->va_type = ap->a_vp->v_type; 326 vap->va_filerev = dep->de_modrev; 327 return (0); 328 } 329 330 static int 331 msdosfs_setattr(struct vop_setattr_args *ap) 332 { 333 struct vnode *vp = ap->a_vp; 334 struct denode *dep = VTODE(ap->a_vp); 335 struct msdosfsmount *pmp = dep->de_pmp; 336 struct vattr *vap = ap->a_vap; 337 struct ucred *cred = ap->a_cred; 338 struct thread *td = curthread; 339 int error = 0; 340 341 #ifdef MSDOSFS_DEBUG 342 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 343 ap->a_vp, vap, cred); 344 #endif 345 346 /* 347 * Check for unsettable attributes. 348 */ 349 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 350 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 351 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 352 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 353 #ifdef MSDOSFS_DEBUG 354 printf("msdosfs_setattr(): returning EINVAL\n"); 355 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 356 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 357 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 358 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 359 printf(" va_uid %x, va_gid %x\n", 360 vap->va_uid, vap->va_gid); 361 #endif 362 return (EINVAL); 363 } 364 365 /* 366 * We don't allow setting attributes on the root directory. 367 * The special case for the root directory is because before 368 * FAT32, the root directory didn't have an entry for itself 369 * (and was otherwise special). With FAT32, the root 370 * directory is not so special, but still doesn't have an 371 * entry for itself. 372 */ 373 if (vp->v_vflag & VV_ROOT) 374 return (EINVAL); 375 376 if (vap->va_flags != VNOVAL) { 377 if (vp->v_mount->mnt_flag & MNT_RDONLY) 378 return (EROFS); 379 if (cred->cr_uid != pmp->pm_uid) { 380 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 381 if (error) 382 return (error); 383 } 384 /* 385 * We are very inconsistent about handling unsupported 386 * attributes. We ignored the access time and the 387 * read and execute bits. We were strict for the other 388 * attributes. 389 */ 390 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY | 391 UF_SYSTEM)) 392 return EOPNOTSUPP; 393 if (vap->va_flags & UF_ARCHIVE) 394 dep->de_Attributes |= ATTR_ARCHIVE; 395 else 396 dep->de_Attributes &= ~ATTR_ARCHIVE; 397 if (vap->va_flags & UF_HIDDEN) 398 dep->de_Attributes |= ATTR_HIDDEN; 399 else 400 dep->de_Attributes &= ~ATTR_HIDDEN; 401 /* We don't allow changing the readonly bit on directories. */ 402 if (vp->v_type != VDIR) { 403 if (vap->va_flags & UF_READONLY) 404 dep->de_Attributes |= ATTR_READONLY; 405 else 406 dep->de_Attributes &= ~ATTR_READONLY; 407 } 408 if (vap->va_flags & UF_SYSTEM) 409 dep->de_Attributes |= ATTR_SYSTEM; 410 else 411 dep->de_Attributes &= ~ATTR_SYSTEM; 412 dep->de_flag |= DE_MODIFIED; 413 } 414 415 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 416 uid_t uid; 417 gid_t gid; 418 419 if (vp->v_mount->mnt_flag & MNT_RDONLY) 420 return (EROFS); 421 uid = vap->va_uid; 422 if (uid == (uid_t)VNOVAL) 423 uid = pmp->pm_uid; 424 gid = vap->va_gid; 425 if (gid == (gid_t)VNOVAL) 426 gid = pmp->pm_gid; 427 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 428 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 429 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 430 if (error) 431 return (error); 432 } 433 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 434 return EINVAL; 435 } 436 437 if (vap->va_size != VNOVAL) { 438 switch (vp->v_type) { 439 case VDIR: 440 return (EISDIR); 441 case VREG: 442 /* 443 * Truncation is only supported for regular files, 444 * Disallow it if the filesystem is read-only. 445 */ 446 if (vp->v_mount->mnt_flag & MNT_RDONLY) 447 return (EROFS); 448 break; 449 default: 450 /* 451 * According to POSIX, the result is unspecified 452 * for file types other than regular files, 453 * directories and shared memory objects. We 454 * don't support any file types except regular 455 * files and directories in this file system, so 456 * this (default) case is unreachable and can do 457 * anything. Keep falling through to detrunc() 458 * for now. 459 */ 460 break; 461 } 462 error = detrunc(dep, vap->va_size, 0, cred); 463 if (error) 464 return error; 465 } 466 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 467 if (vp->v_mount->mnt_flag & MNT_RDONLY) 468 return (EROFS); 469 error = vn_utimes_perm(vp, vap, cred, td); 470 if (error != 0) 471 return (error); 472 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 473 vap->va_atime.tv_sec != VNOVAL) { 474 dep->de_flag &= ~DE_ACCESS; 475 timespec2fattime(&vap->va_atime, 0, 476 &dep->de_ADate, NULL, NULL); 477 } 478 if (vap->va_mtime.tv_sec != VNOVAL) { 479 dep->de_flag &= ~DE_UPDATE; 480 timespec2fattime(&vap->va_mtime, 0, 481 &dep->de_MDate, &dep->de_MTime, NULL); 482 } 483 /* 484 * We don't set the archive bit when modifying the time of 485 * a directory to emulate the Windows/DOS behavior. 486 */ 487 if (vp->v_type != VDIR) 488 dep->de_Attributes |= ATTR_ARCHIVE; 489 dep->de_flag |= DE_MODIFIED; 490 } 491 /* 492 * DOS files only have the ability to have their writability 493 * attribute set, so we use the owner write bit to set the readonly 494 * attribute. 495 */ 496 if (vap->va_mode != (mode_t)VNOVAL) { 497 if (vp->v_mount->mnt_flag & MNT_RDONLY) 498 return (EROFS); 499 if (cred->cr_uid != pmp->pm_uid) { 500 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 501 if (error) 502 return (error); 503 } 504 if (vp->v_type != VDIR) { 505 /* We ignore the read and execute bits. */ 506 if (vap->va_mode & VWRITE) 507 dep->de_Attributes &= ~ATTR_READONLY; 508 else 509 dep->de_Attributes |= ATTR_READONLY; 510 dep->de_Attributes |= ATTR_ARCHIVE; 511 dep->de_flag |= DE_MODIFIED; 512 } 513 } 514 return (deupdat(dep, 0)); 515 } 516 517 static int 518 msdosfs_read(struct vop_read_args *ap) 519 { 520 int error = 0; 521 int blsize; 522 int isadir; 523 ssize_t orig_resid; 524 u_int n; 525 u_long diff; 526 u_long on; 527 daddr_t lbn; 528 daddr_t rablock; 529 int rasize; 530 int seqcount; 531 struct buf *bp; 532 struct vnode *vp = ap->a_vp; 533 struct denode *dep = VTODE(vp); 534 struct msdosfsmount *pmp = dep->de_pmp; 535 struct uio *uio = ap->a_uio; 536 537 /* 538 * If they didn't ask for any data, then we are done. 539 */ 540 orig_resid = uio->uio_resid; 541 if (orig_resid == 0) 542 return (0); 543 544 /* 545 * The caller is supposed to ensure that 546 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 547 * We don't need to check for large offsets as in ffs because 548 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large 549 * offsets cannot cause overflow even in theory. 550 */ 551 552 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 553 554 isadir = dep->de_Attributes & ATTR_DIRECTORY; 555 do { 556 if (uio->uio_offset >= dep->de_FileSize) 557 break; 558 lbn = de_cluster(pmp, uio->uio_offset); 559 rablock = lbn + 1; 560 blsize = pmp->pm_bpcluster; 561 on = uio->uio_offset & pmp->pm_crbomask; 562 /* 563 * If we are operating on a directory file then be sure to 564 * do i/o with the vnode for the filesystem instead of the 565 * vnode for the directory. 566 */ 567 if (isadir) { 568 /* convert cluster # to block # */ 569 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 570 if (error == E2BIG) { 571 error = EINVAL; 572 break; 573 } else if (error) 574 break; 575 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 576 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 577 error = bread(vp, lbn, blsize, NOCRED, &bp); 578 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 579 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 580 NOCRED, on + uio->uio_resid, seqcount, 0, &bp); 581 } else if (seqcount > 1) { 582 rasize = blsize; 583 error = breadn(vp, lbn, 584 blsize, &rablock, &rasize, 1, NOCRED, &bp); 585 } else { 586 error = bread(vp, lbn, blsize, NOCRED, &bp); 587 } 588 if (error) { 589 brelse(bp); 590 break; 591 } 592 diff = pmp->pm_bpcluster - on; 593 n = diff > uio->uio_resid ? uio->uio_resid : diff; 594 diff = dep->de_FileSize - uio->uio_offset; 595 if (diff < n) 596 n = diff; 597 diff = blsize - bp->b_resid; 598 if (diff < n) 599 n = diff; 600 error = vn_io_fault_uiomove(bp->b_data + on, (int) n, uio); 601 brelse(bp); 602 } while (error == 0 && uio->uio_resid > 0 && n != 0); 603 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 604 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 605 dep->de_flag |= DE_ACCESS; 606 return (error); 607 } 608 609 /* 610 * Write data to a file or directory. 611 */ 612 static int 613 msdosfs_write(struct vop_write_args *ap) 614 { 615 int n; 616 int croffset; 617 ssize_t resid; 618 u_long osize; 619 int error = 0; 620 u_long count; 621 int seqcount; 622 daddr_t bn, lastcn; 623 struct buf *bp; 624 int ioflag = ap->a_ioflag; 625 struct uio *uio = ap->a_uio; 626 struct vnode *vp = ap->a_vp; 627 struct vnode *thisvp; 628 struct denode *dep = VTODE(vp); 629 struct msdosfsmount *pmp = dep->de_pmp; 630 struct ucred *cred = ap->a_cred; 631 632 #ifdef MSDOSFS_DEBUG 633 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 634 vp, uio, ioflag, cred); 635 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 636 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 637 #endif 638 639 switch (vp->v_type) { 640 case VREG: 641 if (ioflag & IO_APPEND) 642 uio->uio_offset = dep->de_FileSize; 643 thisvp = vp; 644 break; 645 case VDIR: 646 return EISDIR; 647 default: 648 panic("msdosfs_write(): bad file type"); 649 } 650 651 /* 652 * This is needed (unlike in ffs_write()) because we extend the 653 * file outside of the loop but we don't want to extend the file 654 * for writes of 0 bytes. 655 */ 656 if (uio->uio_resid == 0) 657 return (0); 658 659 /* 660 * The caller is supposed to ensure that 661 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 662 */ 663 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 664 return (EFBIG); 665 666 /* 667 * If they've exceeded their filesize limit, tell them about it. 668 */ 669 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 670 return (EFBIG); 671 672 /* 673 * If the offset we are starting the write at is beyond the end of 674 * the file, then they've done a seek. Unix filesystems allow 675 * files with holes in them, DOS doesn't so we must fill the hole 676 * with zeroed blocks. 677 */ 678 if (uio->uio_offset > dep->de_FileSize) { 679 error = deextend(dep, uio->uio_offset, cred); 680 if (error) 681 return (error); 682 } 683 684 /* 685 * Remember some values in case the write fails. 686 */ 687 resid = uio->uio_resid; 688 osize = dep->de_FileSize; 689 690 /* 691 * If we write beyond the end of the file, extend it to its ultimate 692 * size ahead of the time to hopefully get a contiguous area. 693 */ 694 if (uio->uio_offset + resid > osize) { 695 count = de_clcount(pmp, uio->uio_offset + resid) - 696 de_clcount(pmp, osize); 697 error = extendfile(dep, count, NULL, NULL, 0); 698 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 699 goto errexit; 700 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 701 } else 702 lastcn = de_clcount(pmp, osize) - 1; 703 704 seqcount = ioflag >> IO_SEQSHIFT; 705 do { 706 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 707 error = ENOSPC; 708 break; 709 } 710 711 croffset = uio->uio_offset & pmp->pm_crbomask; 712 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 713 if (uio->uio_offset + n > dep->de_FileSize) { 714 dep->de_FileSize = uio->uio_offset + n; 715 /* The object size needs to be set before buffer is allocated */ 716 vnode_pager_setsize(vp, dep->de_FileSize); 717 } 718 719 bn = de_cluster(pmp, uio->uio_offset); 720 if ((uio->uio_offset & pmp->pm_crbomask) == 0 721 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 722 > de_cluster(pmp, uio->uio_offset) 723 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 724 /* 725 * If either the whole cluster gets written, 726 * or we write the cluster from its start beyond EOF, 727 * then no need to read data from disk. 728 */ 729 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 730 /* 731 * This call to vfs_bio_clrbuf() ensures that 732 * even if vn_io_fault_uiomove() below faults, 733 * garbage from the newly instantiated buffer 734 * is not exposed to the userspace via mmap(). 735 */ 736 vfs_bio_clrbuf(bp); 737 /* 738 * Do the bmap now, since pcbmap needs buffers 739 * for the fat table. (see msdosfs_strategy) 740 */ 741 if (bp->b_blkno == bp->b_lblkno) { 742 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 743 if (error) 744 bp->b_blkno = -1; 745 else 746 bp->b_blkno = bn; 747 } 748 if (bp->b_blkno == -1) { 749 brelse(bp); 750 if (!error) 751 error = EIO; /* XXX */ 752 break; 753 } 754 } else { 755 /* 756 * The block we need to write into exists, so read it in. 757 */ 758 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 759 if (error) { 760 brelse(bp); 761 break; 762 } 763 } 764 765 /* 766 * Should these vnode_pager_* functions be done on dir 767 * files? 768 */ 769 770 /* 771 * Copy the data from user space into the buf header. 772 */ 773 error = vn_io_fault_uiomove(bp->b_data + croffset, n, uio); 774 if (error) { 775 brelse(bp); 776 break; 777 } 778 779 /* Prepare for clustered writes in some else clauses. */ 780 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 781 bp->b_flags |= B_CLUSTEROK; 782 783 /* 784 * If IO_SYNC, then each buffer is written synchronously. 785 * Otherwise, if we have a severe page deficiency then 786 * write the buffer asynchronously. Otherwise, if on a 787 * cluster boundary then write the buffer asynchronously, 788 * combining it with contiguous clusters if permitted and 789 * possible, since we don't expect more writes into this 790 * buffer soon. Otherwise, do a delayed write because we 791 * expect more writes into this buffer soon. 792 */ 793 if (ioflag & IO_SYNC) 794 (void)bwrite(bp); 795 else if (vm_page_count_severe() || buf_dirty_count_severe()) 796 bawrite(bp); 797 else if (n + croffset == pmp->pm_bpcluster) { 798 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 799 cluster_write(vp, bp, dep->de_FileSize, 800 seqcount, 0); 801 else 802 bawrite(bp); 803 } else 804 bdwrite(bp); 805 dep->de_flag |= DE_UPDATE; 806 } while (error == 0 && uio->uio_resid > 0); 807 808 /* 809 * If the write failed and they want us to, truncate the file back 810 * to the size it was before the write was attempted. 811 */ 812 errexit: 813 if (error) { 814 if (ioflag & IO_UNIT) { 815 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 816 uio->uio_offset -= resid - uio->uio_resid; 817 uio->uio_resid = resid; 818 } else { 819 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 820 if (uio->uio_resid != resid) 821 error = 0; 822 } 823 } else if (ioflag & IO_SYNC) 824 error = deupdat(dep, 1); 825 return (error); 826 } 827 828 /* 829 * Flush the blocks of a file to disk. 830 */ 831 static int 832 msdosfs_fsync(struct vop_fsync_args *ap) 833 { 834 struct vnode *devvp; 835 int allerror, error; 836 837 vop_stdfsync(ap); 838 839 /* 840 * If the syncing request comes from fsync(2), sync the entire 841 * FAT and any other metadata that happens to be on devvp. We 842 * need this mainly for the FAT. We write the FAT sloppily, and 843 * syncing it all now is the best we can easily do to get all 844 * directory entries associated with the file (not just the file) 845 * fully synced. The other metadata includes critical metadata 846 * for all directory entries, but only in the MNT_ASYNC case. We 847 * will soon sync all metadata in the file's directory entry. 848 * Non-critical metadata for associated directory entries only 849 * gets synced accidentally, as in most file systems. 850 */ 851 if (ap->a_waitfor == MNT_WAIT) { 852 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 853 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 854 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 855 VOP_UNLOCK(devvp, 0); 856 } else 857 allerror = 0; 858 859 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT); 860 if (allerror == 0) 861 allerror = error; 862 return (allerror); 863 } 864 865 static int 866 msdosfs_remove(struct vop_remove_args *ap) 867 { 868 struct denode *dep = VTODE(ap->a_vp); 869 struct denode *ddep = VTODE(ap->a_dvp); 870 int error; 871 872 if (ap->a_vp->v_type == VDIR) 873 error = EPERM; 874 else 875 error = removede(ddep, dep); 876 #ifdef MSDOSFS_DEBUG 877 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 878 #endif 879 return (error); 880 } 881 882 /* 883 * DOS filesystems don't know what links are. 884 */ 885 static int 886 msdosfs_link(struct vop_link_args *ap) 887 { 888 return (EOPNOTSUPP); 889 } 890 891 /* 892 * Renames on files require moving the denode to a new hash queue since the 893 * denode's location is used to compute which hash queue to put the file 894 * in. Unless it is a rename in place. For example "mv a b". 895 * 896 * What follows is the basic algorithm: 897 * 898 * if (file move) { 899 * if (dest file exists) { 900 * remove dest file 901 * } 902 * if (dest and src in same directory) { 903 * rewrite name in existing directory slot 904 * } else { 905 * write new entry in dest directory 906 * update offset and dirclust in denode 907 * move denode to new hash chain 908 * clear old directory entry 909 * } 910 * } else { 911 * directory move 912 * if (dest directory exists) { 913 * if (dest is not empty) { 914 * return ENOTEMPTY 915 * } 916 * remove dest directory 917 * } 918 * if (dest and src in same directory) { 919 * rewrite name in existing entry 920 * } else { 921 * be sure dest is not a child of src directory 922 * write entry in dest directory 923 * update "." and ".." in moved directory 924 * clear old directory entry for moved directory 925 * } 926 * } 927 * 928 * On entry: 929 * source's parent directory is unlocked 930 * source file or directory is unlocked 931 * destination's parent directory is locked 932 * destination file or directory is locked if it exists 933 * 934 * On exit: 935 * all denodes should be released 936 */ 937 static int 938 msdosfs_rename(struct vop_rename_args *ap) 939 { 940 struct vnode *tdvp = ap->a_tdvp; 941 struct vnode *fvp = ap->a_fvp; 942 struct vnode *fdvp = ap->a_fdvp; 943 struct vnode *tvp = ap->a_tvp; 944 struct componentname *tcnp = ap->a_tcnp; 945 struct componentname *fcnp = ap->a_fcnp; 946 struct denode *ip, *xp, *dp, *zp; 947 u_char toname[12], oldname[11]; 948 u_long from_diroffset, to_diroffset; 949 u_char to_count; 950 int doingdirectory = 0, newparent = 0; 951 int error; 952 u_long cn, pcl; 953 daddr_t bn; 954 struct msdosfsmount *pmp; 955 struct direntry *dotdotp; 956 struct buf *bp; 957 958 pmp = VFSTOMSDOSFS(fdvp->v_mount); 959 960 #ifdef DIAGNOSTIC 961 if ((tcnp->cn_flags & HASBUF) == 0 || 962 (fcnp->cn_flags & HASBUF) == 0) 963 panic("msdosfs_rename: no name"); 964 #endif 965 /* 966 * Check for cross-device rename. 967 */ 968 if (fvp->v_mount != tdvp->v_mount || 969 (tvp && fvp->v_mount != tvp->v_mount)) { 970 error = EXDEV; 971 abortit: 972 if (tdvp == tvp) 973 vrele(tdvp); 974 else 975 vput(tdvp); 976 if (tvp) 977 vput(tvp); 978 vrele(fdvp); 979 vrele(fvp); 980 return (error); 981 } 982 983 /* 984 * If source and dest are the same, do nothing. 985 */ 986 if (tvp == fvp) { 987 error = 0; 988 goto abortit; 989 } 990 991 error = vn_lock(fvp, LK_EXCLUSIVE); 992 if (error) 993 goto abortit; 994 dp = VTODE(fdvp); 995 ip = VTODE(fvp); 996 997 /* 998 * Be sure we are not renaming ".", "..", or an alias of ".". This 999 * leads to a crippled directory tree. It's pretty tough to do a 1000 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1001 * doesn't work if the ".." entry is missing. 1002 */ 1003 if (ip->de_Attributes & ATTR_DIRECTORY) { 1004 /* 1005 * Avoid ".", "..", and aliases of "." for obvious reasons. 1006 */ 1007 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1008 dp == ip || 1009 (fcnp->cn_flags & ISDOTDOT) || 1010 (tcnp->cn_flags & ISDOTDOT) || 1011 (ip->de_flag & DE_RENAME)) { 1012 VOP_UNLOCK(fvp, 0); 1013 error = EINVAL; 1014 goto abortit; 1015 } 1016 ip->de_flag |= DE_RENAME; 1017 doingdirectory++; 1018 } 1019 1020 /* 1021 * When the target exists, both the directory 1022 * and target vnodes are returned locked. 1023 */ 1024 dp = VTODE(tdvp); 1025 xp = tvp ? VTODE(tvp) : NULL; 1026 /* 1027 * Remember direntry place to use for destination 1028 */ 1029 to_diroffset = dp->de_fndoffset; 1030 to_count = dp->de_fndcnt; 1031 1032 /* 1033 * If ".." must be changed (ie the directory gets a new 1034 * parent) then the source directory must not be in the 1035 * directory hierarchy above the target, as this would 1036 * orphan everything below the source directory. Also 1037 * the user must have write permission in the source so 1038 * as to be able to change "..". We must repeat the call 1039 * to namei, as the parent directory is unlocked by the 1040 * call to doscheckpath(). 1041 */ 1042 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1043 VOP_UNLOCK(fvp, 0); 1044 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1045 newparent = 1; 1046 if (doingdirectory && newparent) { 1047 if (error) /* write access check above */ 1048 goto bad; 1049 if (xp != NULL) 1050 vput(tvp); 1051 /* 1052 * doscheckpath() vput()'s dp, 1053 * so we have to do a relookup afterwards 1054 */ 1055 error = doscheckpath(ip, dp); 1056 if (error) 1057 goto out; 1058 if ((tcnp->cn_flags & SAVESTART) == 0) 1059 panic("msdosfs_rename: lost to startdir"); 1060 error = relookup(tdvp, &tvp, tcnp); 1061 if (error) 1062 goto out; 1063 dp = VTODE(tdvp); 1064 xp = tvp ? VTODE(tvp) : NULL; 1065 } 1066 1067 if (xp != NULL) { 1068 /* 1069 * Target must be empty if a directory and have no links 1070 * to it. Also, ensure source and target are compatible 1071 * (both directories, or both not directories). 1072 */ 1073 if (xp->de_Attributes & ATTR_DIRECTORY) { 1074 if (!dosdirempty(xp)) { 1075 error = ENOTEMPTY; 1076 goto bad; 1077 } 1078 if (!doingdirectory) { 1079 error = ENOTDIR; 1080 goto bad; 1081 } 1082 cache_purge(tdvp); 1083 } else if (doingdirectory) { 1084 error = EISDIR; 1085 goto bad; 1086 } 1087 error = removede(dp, xp); 1088 if (error) 1089 goto bad; 1090 vput(tvp); 1091 xp = NULL; 1092 } 1093 1094 /* 1095 * Convert the filename in tcnp into a dos filename. We copy this 1096 * into the denode and directory entry for the destination 1097 * file/directory. 1098 */ 1099 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1100 if (error) 1101 goto abortit; 1102 1103 /* 1104 * Since from wasn't locked at various places above, 1105 * have to do a relookup here. 1106 */ 1107 fcnp->cn_flags &= ~MODMASK; 1108 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1109 if ((fcnp->cn_flags & SAVESTART) == 0) 1110 panic("msdosfs_rename: lost from startdir"); 1111 if (!newparent) 1112 VOP_UNLOCK(tdvp, 0); 1113 if (relookup(fdvp, &fvp, fcnp) == 0) 1114 vrele(fdvp); 1115 if (fvp == NULL) { 1116 /* 1117 * From name has disappeared. 1118 */ 1119 if (doingdirectory) 1120 panic("rename: lost dir entry"); 1121 if (newparent) 1122 VOP_UNLOCK(tdvp, 0); 1123 vrele(tdvp); 1124 vrele(ap->a_fvp); 1125 return 0; 1126 } 1127 xp = VTODE(fvp); 1128 zp = VTODE(fdvp); 1129 from_diroffset = zp->de_fndoffset; 1130 1131 /* 1132 * Ensure that the directory entry still exists and has not 1133 * changed till now. If the source is a file the entry may 1134 * have been unlinked or renamed. In either case there is 1135 * no further work to be done. If the source is a directory 1136 * then it cannot have been rmdir'ed or renamed; this is 1137 * prohibited by the DE_RENAME flag. 1138 */ 1139 if (xp != ip) { 1140 if (doingdirectory) 1141 panic("rename: lost dir entry"); 1142 VOP_UNLOCK(fvp, 0); 1143 if (newparent) 1144 VOP_UNLOCK(fdvp, 0); 1145 vrele(ap->a_fvp); 1146 xp = NULL; 1147 } else { 1148 vrele(fvp); 1149 xp = NULL; 1150 1151 /* 1152 * First write a new entry in the destination 1153 * directory and mark the entry in the source directory 1154 * as deleted. Then move the denode to the correct hash 1155 * chain for its new location in the filesystem. And, if 1156 * we moved a directory, then update its .. entry to point 1157 * to the new parent directory. 1158 */ 1159 bcopy(ip->de_Name, oldname, 11); 1160 bcopy(toname, ip->de_Name, 11); /* update denode */ 1161 dp->de_fndoffset = to_diroffset; 1162 dp->de_fndcnt = to_count; 1163 error = createde(ip, dp, (struct denode **)0, tcnp); 1164 if (error) { 1165 bcopy(oldname, ip->de_Name, 11); 1166 if (newparent) 1167 VOP_UNLOCK(fdvp, 0); 1168 VOP_UNLOCK(fvp, 0); 1169 goto bad; 1170 } 1171 /* 1172 * If ip is for a directory, then its name should always 1173 * be "." since it is for the directory entry in the 1174 * directory itself (msdosfs_lookup() always translates 1175 * to the "." entry so as to get a unique denode, except 1176 * for the root directory there are different 1177 * complications). However, we just corrupted its name 1178 * to pass the correct name to createde(). Undo this. 1179 */ 1180 if ((ip->de_Attributes & ATTR_DIRECTORY) != 0) 1181 bcopy(oldname, ip->de_Name, 11); 1182 ip->de_refcnt++; 1183 zp->de_fndoffset = from_diroffset; 1184 error = removede(zp, ip); 1185 if (error) { 1186 /* XXX should downgrade to ro here, fs is corrupt */ 1187 if (newparent) 1188 VOP_UNLOCK(fdvp, 0); 1189 VOP_UNLOCK(fvp, 0); 1190 goto bad; 1191 } 1192 if (!doingdirectory) { 1193 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1194 &ip->de_dirclust, 0); 1195 if (error) { 1196 /* XXX should downgrade to ro here, fs is corrupt */ 1197 if (newparent) 1198 VOP_UNLOCK(fdvp, 0); 1199 VOP_UNLOCK(fvp, 0); 1200 goto bad; 1201 } 1202 if (ip->de_dirclust == MSDOSFSROOT) 1203 ip->de_diroffset = to_diroffset; 1204 else 1205 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1206 } 1207 reinsert(ip); 1208 if (newparent) 1209 VOP_UNLOCK(fdvp, 0); 1210 } 1211 1212 /* 1213 * If we moved a directory to a new parent directory, then we must 1214 * fixup the ".." entry in the moved directory. 1215 */ 1216 if (doingdirectory && newparent) { 1217 cn = ip->de_StartCluster; 1218 if (cn == MSDOSFSROOT) { 1219 /* this should never happen */ 1220 panic("msdosfs_rename(): updating .. in root directory?"); 1221 } else 1222 bn = cntobn(pmp, cn); 1223 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1224 NOCRED, &bp); 1225 if (error) { 1226 /* XXX should downgrade to ro here, fs is corrupt */ 1227 brelse(bp); 1228 VOP_UNLOCK(fvp, 0); 1229 goto bad; 1230 } 1231 dotdotp = (struct direntry *)bp->b_data + 1; 1232 pcl = dp->de_StartCluster; 1233 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1234 pcl = MSDOSFSROOT; 1235 putushort(dotdotp->deStartCluster, pcl); 1236 if (FAT32(pmp)) 1237 putushort(dotdotp->deHighClust, pcl >> 16); 1238 if (DOINGASYNC(fvp)) 1239 bdwrite(bp); 1240 else if ((error = bwrite(bp)) != 0) { 1241 /* XXX should downgrade to ro here, fs is corrupt */ 1242 VOP_UNLOCK(fvp, 0); 1243 goto bad; 1244 } 1245 } 1246 1247 /* 1248 * The msdosfs lookup is case insensitive. Several aliases may 1249 * be inserted for a single directory entry. As a consequnce, 1250 * name cache purge done by lookup for fvp when DELETE op for 1251 * namei is specified, might be not enough to expunge all 1252 * namecache entries that were installed for this direntry. 1253 */ 1254 cache_purge(fvp); 1255 VOP_UNLOCK(fvp, 0); 1256 bad: 1257 if (xp) 1258 vput(tvp); 1259 vput(tdvp); 1260 out: 1261 ip->de_flag &= ~DE_RENAME; 1262 vrele(fdvp); 1263 vrele(fvp); 1264 return (error); 1265 1266 } 1267 1268 static struct { 1269 struct direntry dot; 1270 struct direntry dotdot; 1271 } dosdirtemplate = { 1272 { ". ", /* the . entry */ 1273 ATTR_DIRECTORY, /* file attribute */ 1274 0, /* reserved */ 1275 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1276 { 0, 0 }, /* access date */ 1277 { 0, 0 }, /* high bits of start cluster */ 1278 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1279 { 0, 0 }, /* startcluster */ 1280 { 0, 0, 0, 0 } /* filesize */ 1281 }, 1282 { ".. ", /* the .. entry */ 1283 ATTR_DIRECTORY, /* file attribute */ 1284 0, /* reserved */ 1285 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1286 { 0, 0 }, /* access date */ 1287 { 0, 0 }, /* high bits of start cluster */ 1288 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1289 { 0, 0 }, /* startcluster */ 1290 { 0, 0, 0, 0 } /* filesize */ 1291 } 1292 }; 1293 1294 static int 1295 msdosfs_mkdir(struct vop_mkdir_args *ap) 1296 { 1297 struct componentname *cnp = ap->a_cnp; 1298 struct denode *dep; 1299 struct denode *pdep = VTODE(ap->a_dvp); 1300 struct direntry *denp; 1301 struct msdosfsmount *pmp = pdep->de_pmp; 1302 struct buf *bp; 1303 u_long newcluster, pcl; 1304 int bn; 1305 int error; 1306 struct denode ndirent; 1307 struct timespec ts; 1308 1309 /* 1310 * If this is the root directory and there is no space left we 1311 * can't do anything. This is because the root directory can not 1312 * change size. 1313 */ 1314 if (pdep->de_StartCluster == MSDOSFSROOT 1315 && pdep->de_fndoffset >= pdep->de_FileSize) { 1316 error = ENOSPC; 1317 goto bad2; 1318 } 1319 1320 /* 1321 * Allocate a cluster to hold the about to be created directory. 1322 */ 1323 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1324 if (error) 1325 goto bad2; 1326 1327 bzero(&ndirent, sizeof(ndirent)); 1328 ndirent.de_pmp = pmp; 1329 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1330 vfs_timestamp(&ts); 1331 DETIMES(&ndirent, &ts, &ts, &ts); 1332 1333 /* 1334 * Now fill the cluster with the "." and ".." entries. And write 1335 * the cluster to disk. This way it is there for the parent 1336 * directory to be pointing at if there were a crash. 1337 */ 1338 bn = cntobn(pmp, newcluster); 1339 /* always succeeds */ 1340 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1341 bzero(bp->b_data, pmp->pm_bpcluster); 1342 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1343 denp = (struct direntry *)bp->b_data; 1344 putushort(denp[0].deStartCluster, newcluster); 1345 putushort(denp[0].deCDate, ndirent.de_CDate); 1346 putushort(denp[0].deCTime, ndirent.de_CTime); 1347 denp[0].deCHundredth = ndirent.de_CHun; 1348 putushort(denp[0].deADate, ndirent.de_ADate); 1349 putushort(denp[0].deMDate, ndirent.de_MDate); 1350 putushort(denp[0].deMTime, ndirent.de_MTime); 1351 pcl = pdep->de_StartCluster; 1352 /* 1353 * Although the root directory has a non-magic starting cluster 1354 * number for FAT32, chkdsk and fsck_msdosfs still require 1355 * references to it in dotdot entries to be magic. 1356 */ 1357 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1358 pcl = MSDOSFSROOT; 1359 putushort(denp[1].deStartCluster, pcl); 1360 putushort(denp[1].deCDate, ndirent.de_CDate); 1361 putushort(denp[1].deCTime, ndirent.de_CTime); 1362 denp[1].deCHundredth = ndirent.de_CHun; 1363 putushort(denp[1].deADate, ndirent.de_ADate); 1364 putushort(denp[1].deMDate, ndirent.de_MDate); 1365 putushort(denp[1].deMTime, ndirent.de_MTime); 1366 if (FAT32(pmp)) { 1367 putushort(denp[0].deHighClust, newcluster >> 16); 1368 putushort(denp[1].deHighClust, pcl >> 16); 1369 } 1370 1371 if (DOINGASYNC(ap->a_dvp)) 1372 bdwrite(bp); 1373 else if ((error = bwrite(bp)) != 0) 1374 goto bad; 1375 1376 /* 1377 * Now build up a directory entry pointing to the newly allocated 1378 * cluster. This will be written to an empty slot in the parent 1379 * directory. 1380 */ 1381 #ifdef DIAGNOSTIC 1382 if ((cnp->cn_flags & HASBUF) == 0) 1383 panic("msdosfs_mkdir: no name"); 1384 #endif 1385 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1386 if (error) 1387 goto bad; 1388 1389 ndirent.de_Attributes = ATTR_DIRECTORY; 1390 ndirent.de_LowerCase = 0; 1391 ndirent.de_StartCluster = newcluster; 1392 ndirent.de_FileSize = 0; 1393 error = createde(&ndirent, pdep, &dep, cnp); 1394 if (error) 1395 goto bad; 1396 *ap->a_vpp = DETOV(dep); 1397 return (0); 1398 1399 bad: 1400 clusterfree(pmp, newcluster, NULL); 1401 bad2: 1402 return (error); 1403 } 1404 1405 static int 1406 msdosfs_rmdir(struct vop_rmdir_args *ap) 1407 { 1408 struct vnode *vp = ap->a_vp; 1409 struct vnode *dvp = ap->a_dvp; 1410 struct componentname *cnp = ap->a_cnp; 1411 struct denode *ip, *dp; 1412 int error; 1413 1414 ip = VTODE(vp); 1415 dp = VTODE(dvp); 1416 1417 /* 1418 * Verify the directory is empty (and valid). 1419 * (Rmdir ".." won't be valid since 1420 * ".." will contain a reference to 1421 * the current directory and thus be 1422 * non-empty.) 1423 */ 1424 error = 0; 1425 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1426 error = ENOTEMPTY; 1427 goto out; 1428 } 1429 /* 1430 * Delete the entry from the directory. For dos filesystems this 1431 * gets rid of the directory entry on disk, the in memory copy 1432 * still exists but the de_refcnt is <= 0. This prevents it from 1433 * being found by deget(). When the vput() on dep is done we give 1434 * up access and eventually msdosfs_reclaim() will be called which 1435 * will remove it from the denode cache. 1436 */ 1437 error = removede(dp, ip); 1438 if (error) 1439 goto out; 1440 /* 1441 * This is where we decrement the link count in the parent 1442 * directory. Since dos filesystems don't do this we just purge 1443 * the name cache. 1444 */ 1445 cache_purge(dvp); 1446 /* 1447 * Truncate the directory that is being deleted. 1448 */ 1449 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1450 cache_purge(vp); 1451 1452 out: 1453 return (error); 1454 } 1455 1456 /* 1457 * DOS filesystems don't know what symlinks are. 1458 */ 1459 static int 1460 msdosfs_symlink(struct vop_symlink_args *ap) 1461 { 1462 return (EOPNOTSUPP); 1463 } 1464 1465 static int 1466 msdosfs_readdir(struct vop_readdir_args *ap) 1467 { 1468 struct mbnambuf nb; 1469 int error = 0; 1470 int diff; 1471 long n; 1472 int blsize; 1473 long on; 1474 u_long cn; 1475 uint64_t fileno; 1476 u_long dirsperblk; 1477 long bias = 0; 1478 daddr_t bn, lbn; 1479 struct buf *bp; 1480 struct denode *dep = VTODE(ap->a_vp); 1481 struct msdosfsmount *pmp = dep->de_pmp; 1482 struct direntry *dentp; 1483 struct dirent dirbuf; 1484 struct uio *uio = ap->a_uio; 1485 u_long *cookies = NULL; 1486 int ncookies = 0; 1487 off_t offset, off; 1488 int chksum = -1; 1489 1490 #ifdef MSDOSFS_DEBUG 1491 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1492 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1493 #endif 1494 1495 /* 1496 * msdosfs_readdir() won't operate properly on regular files since 1497 * it does i/o only with the filesystem vnode, and hence can 1498 * retrieve the wrong block from the buffer cache for a plain file. 1499 * So, fail attempts to readdir() on a plain file. 1500 */ 1501 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1502 return (ENOTDIR); 1503 1504 /* 1505 * To be safe, initialize dirbuf 1506 */ 1507 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1508 1509 /* 1510 * If the user buffer is smaller than the size of one dos directory 1511 * entry or the file offset is not a multiple of the size of a 1512 * directory entry, then we fail the read. 1513 */ 1514 off = offset = uio->uio_offset; 1515 if (uio->uio_resid < sizeof(struct direntry) || 1516 (offset & (sizeof(struct direntry) - 1))) 1517 return (EINVAL); 1518 1519 if (ap->a_ncookies) { 1520 ncookies = uio->uio_resid / 16; 1521 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1522 M_WAITOK); 1523 *ap->a_cookies = cookies; 1524 *ap->a_ncookies = ncookies; 1525 } 1526 1527 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1528 1529 /* 1530 * If they are reading from the root directory then, we simulate 1531 * the . and .. entries since these don't exist in the root 1532 * directory. We also set the offset bias to make up for having to 1533 * simulate these entries. By this I mean that at file offset 64 we 1534 * read the first entry in the root directory that lives on disk. 1535 */ 1536 if (dep->de_StartCluster == MSDOSFSROOT 1537 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1538 #if 0 1539 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1540 offset); 1541 #endif 1542 bias = 2 * sizeof(struct direntry); 1543 if (offset < bias) { 1544 for (n = (int)offset / sizeof(struct direntry); 1545 n < 2; n++) { 1546 if (FAT32(pmp)) 1547 fileno = (uint64_t)cntobn(pmp, 1548 pmp->pm_rootdirblk) 1549 * dirsperblk; 1550 else 1551 fileno = 1; 1552 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1553 dirbuf.d_fileno = 1554 msdosfs_fileno_map(pmp->pm_mountp, 1555 fileno); 1556 } else { 1557 1558 dirbuf.d_fileno = (uint32_t)fileno; 1559 } 1560 dirbuf.d_type = DT_DIR; 1561 switch (n) { 1562 case 0: 1563 dirbuf.d_namlen = 1; 1564 dirbuf.d_name[0] = '.'; 1565 break; 1566 case 1: 1567 dirbuf.d_namlen = 2; 1568 dirbuf.d_name[0] = '.'; 1569 dirbuf.d_name[1] = '.'; 1570 break; 1571 } 1572 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1573 dirent_terminate(&dirbuf); 1574 if (uio->uio_resid < dirbuf.d_reclen) 1575 goto out; 1576 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1577 if (error) 1578 goto out; 1579 offset += sizeof(struct direntry); 1580 off = offset; 1581 if (cookies) { 1582 *cookies++ = offset; 1583 if (--ncookies <= 0) 1584 goto out; 1585 } 1586 } 1587 } 1588 } 1589 1590 mbnambuf_init(&nb); 1591 off = offset; 1592 while (uio->uio_resid > 0) { 1593 lbn = de_cluster(pmp, offset - bias); 1594 on = (offset - bias) & pmp->pm_crbomask; 1595 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1596 diff = dep->de_FileSize - (offset - bias); 1597 if (diff <= 0) 1598 break; 1599 n = min(n, diff); 1600 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1601 if (error) 1602 break; 1603 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1604 if (error) { 1605 brelse(bp); 1606 return (error); 1607 } 1608 n = min(n, blsize - bp->b_resid); 1609 if (n == 0) { 1610 brelse(bp); 1611 return (EIO); 1612 } 1613 1614 /* 1615 * Convert from dos directory entries to fs-independent 1616 * directory entries. 1617 */ 1618 for (dentp = (struct direntry *)(bp->b_data + on); 1619 (char *)dentp < bp->b_data + on + n; 1620 dentp++, offset += sizeof(struct direntry)) { 1621 #if 0 1622 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1623 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1624 #endif 1625 /* 1626 * If this is an unused entry, we can stop. 1627 */ 1628 if (dentp->deName[0] == SLOT_EMPTY) { 1629 brelse(bp); 1630 goto out; 1631 } 1632 /* 1633 * Skip deleted entries. 1634 */ 1635 if (dentp->deName[0] == SLOT_DELETED) { 1636 chksum = -1; 1637 mbnambuf_init(&nb); 1638 continue; 1639 } 1640 1641 /* 1642 * Handle Win95 long directory entries 1643 */ 1644 if (dentp->deAttributes == ATTR_WIN95) { 1645 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1646 continue; 1647 chksum = win2unixfn(&nb, 1648 (struct winentry *)dentp, chksum, pmp); 1649 continue; 1650 } 1651 1652 /* 1653 * Skip volume labels 1654 */ 1655 if (dentp->deAttributes & ATTR_VOLUME) { 1656 chksum = -1; 1657 mbnambuf_init(&nb); 1658 continue; 1659 } 1660 /* 1661 * This computation of d_fileno must match 1662 * the computation of va_fileid in 1663 * msdosfs_getattr. 1664 */ 1665 if (dentp->deAttributes & ATTR_DIRECTORY) { 1666 fileno = getushort(dentp->deStartCluster); 1667 if (FAT32(pmp)) 1668 fileno |= getushort(dentp->deHighClust) << 16; 1669 /* if this is the root directory */ 1670 if (fileno == MSDOSFSROOT) 1671 if (FAT32(pmp)) 1672 fileno = (uint64_t)cntobn(pmp, 1673 pmp->pm_rootdirblk) 1674 * dirsperblk; 1675 else 1676 fileno = 1; 1677 else 1678 fileno = (uint64_t)cntobn(pmp, fileno) * 1679 dirsperblk; 1680 dirbuf.d_type = DT_DIR; 1681 } else { 1682 fileno = (uoff_t)offset / 1683 sizeof(struct direntry); 1684 dirbuf.d_type = DT_REG; 1685 } 1686 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1687 dirbuf.d_fileno = 1688 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1689 } else 1690 dirbuf.d_fileno = (uint32_t)fileno; 1691 1692 if (chksum != winChksum(dentp->deName)) { 1693 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1694 (u_char *)dirbuf.d_name, 1695 dentp->deLowerCase | 1696 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1697 (LCASE_BASE | LCASE_EXT) : 0), 1698 pmp); 1699 mbnambuf_init(&nb); 1700 } else 1701 mbnambuf_flush(&nb, &dirbuf); 1702 chksum = -1; 1703 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1704 dirent_terminate(&dirbuf); 1705 if (uio->uio_resid < dirbuf.d_reclen) { 1706 brelse(bp); 1707 goto out; 1708 } 1709 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1710 if (error) { 1711 brelse(bp); 1712 goto out; 1713 } 1714 if (cookies) { 1715 *cookies++ = offset + sizeof(struct direntry); 1716 if (--ncookies <= 0) { 1717 brelse(bp); 1718 goto out; 1719 } 1720 } 1721 off = offset + sizeof(struct direntry); 1722 } 1723 brelse(bp); 1724 } 1725 out: 1726 /* Subtract unused cookies */ 1727 if (ap->a_ncookies) 1728 *ap->a_ncookies -= ncookies; 1729 1730 uio->uio_offset = off; 1731 1732 /* 1733 * Set the eofflag (NFS uses it) 1734 */ 1735 if (ap->a_eofflag) { 1736 if (dep->de_FileSize - (offset - bias) <= 0) 1737 *ap->a_eofflag = 1; 1738 else 1739 *ap->a_eofflag = 0; 1740 } 1741 return (error); 1742 } 1743 1744 /*- 1745 * a_vp - pointer to the file's vnode 1746 * a_bn - logical block number within the file (cluster number for us) 1747 * a_bop - where to return the bufobj of the special file containing the fs 1748 * a_bnp - where to return the "physical" block number corresponding to a_bn 1749 * (relative to the special file; units are blocks of size DEV_BSIZE) 1750 * a_runp - where to return the "run past" a_bn. This is the count of logical 1751 * blocks whose physical blocks (together with a_bn's physical block) 1752 * are contiguous. 1753 * a_runb - where to return the "run before" a_bn. 1754 */ 1755 static int 1756 msdosfs_bmap(struct vop_bmap_args *ap) 1757 { 1758 struct denode *dep; 1759 struct mount *mp; 1760 struct msdosfsmount *pmp; 1761 struct vnode *vp; 1762 daddr_t runbn; 1763 u_long cn; 1764 int bnpercn, error, maxio, maxrun, run; 1765 1766 vp = ap->a_vp; 1767 dep = VTODE(vp); 1768 pmp = dep->de_pmp; 1769 if (ap->a_bop != NULL) 1770 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1771 if (ap->a_bnp == NULL) 1772 return (0); 1773 if (ap->a_runp != NULL) 1774 *ap->a_runp = 0; 1775 if (ap->a_runb != NULL) 1776 *ap->a_runb = 0; 1777 cn = ap->a_bn; 1778 if (cn != ap->a_bn) 1779 return (EFBIG); 1780 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1781 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1782 return (error); 1783 1784 mp = vp->v_mount; 1785 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1786 bnpercn = de_cn2bn(pmp, 1); 1787 if (ap->a_runp != NULL) { 1788 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1789 for (run = 1; run <= maxrun; run++) { 1790 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1791 runbn != *ap->a_bnp + run * bnpercn) 1792 break; 1793 } 1794 *ap->a_runp = run - 1; 1795 } 1796 if (ap->a_runb != NULL) { 1797 maxrun = ulmin(maxio - 1, cn); 1798 for (run = 1; run < maxrun; run++) { 1799 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1800 runbn != *ap->a_bnp - run * bnpercn) 1801 break; 1802 } 1803 *ap->a_runb = run - 1; 1804 } 1805 return (0); 1806 } 1807 1808 SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW, 0, "msdos filesystem"); 1809 static int use_buf_pager = 0; 1810 SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, 1811 &use_buf_pager, 0, 1812 "Use buffer pager instead of bmap"); 1813 1814 static daddr_t 1815 msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 1816 { 1817 1818 return (de_cluster(VTODE(vp)->de_pmp, off)); 1819 } 1820 1821 static int 1822 msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn) 1823 { 1824 1825 return (VTODE(vp)->de_pmp->pm_bpcluster); 1826 } 1827 1828 static int 1829 msdosfs_getpages(struct vop_getpages_args *ap) 1830 { 1831 1832 if (use_buf_pager) 1833 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count, 1834 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno, 1835 msdosfs_gbp_getblksz)); 1836 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count, 1837 ap->a_rbehind, ap->a_rahead, NULL, NULL)); 1838 } 1839 1840 static int 1841 msdosfs_strategy(struct vop_strategy_args *ap) 1842 { 1843 struct buf *bp = ap->a_bp; 1844 struct denode *dep = VTODE(ap->a_vp); 1845 struct bufobj *bo; 1846 int error = 0; 1847 daddr_t blkno; 1848 1849 /* 1850 * If we don't already know the filesystem relative block number 1851 * then get it using pcbmap(). If pcbmap() returns the block 1852 * number as -1 then we've got a hole in the file. DOS filesystems 1853 * don't allow files with holes, so we shouldn't ever see this. 1854 */ 1855 if (bp->b_blkno == bp->b_lblkno) { 1856 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1857 bp->b_blkno = blkno; 1858 if (error) { 1859 bp->b_error = error; 1860 bp->b_ioflags |= BIO_ERROR; 1861 bufdone(bp); 1862 return (0); 1863 } 1864 if ((long)bp->b_blkno == -1) 1865 vfs_bio_clrbuf(bp); 1866 } 1867 if (bp->b_blkno == -1) { 1868 bufdone(bp); 1869 return (0); 1870 } 1871 /* 1872 * Read/write the block from/to the disk that contains the desired 1873 * file block. 1874 */ 1875 bp->b_iooffset = dbtob(bp->b_blkno); 1876 bo = dep->de_pmp->pm_bo; 1877 BO_STRATEGY(bo, bp); 1878 return (0); 1879 } 1880 1881 static int 1882 msdosfs_print(struct vop_print_args *ap) 1883 { 1884 struct denode *dep = VTODE(ap->a_vp); 1885 1886 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1887 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1888 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1889 return (0); 1890 } 1891 1892 static int 1893 msdosfs_pathconf(struct vop_pathconf_args *ap) 1894 { 1895 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1896 1897 switch (ap->a_name) { 1898 case _PC_FILESIZEBITS: 1899 *ap->a_retval = 32; 1900 return (0); 1901 case _PC_LINK_MAX: 1902 *ap->a_retval = 1; 1903 return (0); 1904 case _PC_NAME_MAX: 1905 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1906 return (0); 1907 case _PC_CHOWN_RESTRICTED: 1908 *ap->a_retval = 1; 1909 return (0); 1910 case _PC_NO_TRUNC: 1911 *ap->a_retval = 0; 1912 return (0); 1913 default: 1914 return (vop_stdpathconf(ap)); 1915 } 1916 /* NOTREACHED */ 1917 } 1918 1919 static int 1920 msdosfs_vptofh(struct vop_vptofh_args *ap) 1921 { 1922 struct denode *dep; 1923 struct defid *defhp; 1924 1925 dep = VTODE(ap->a_vp); 1926 defhp = (struct defid *)ap->a_fhp; 1927 defhp->defid_len = sizeof(struct defid); 1928 defhp->defid_dirclust = dep->de_dirclust; 1929 defhp->defid_dirofs = dep->de_diroffset; 1930 /* defhp->defid_gen = dep->de_gen; */ 1931 return (0); 1932 } 1933 1934 /* Global vfs data structures for msdosfs */ 1935 struct vop_vector msdosfs_vnodeops = { 1936 .vop_default = &default_vnodeops, 1937 1938 .vop_access = msdosfs_access, 1939 .vop_bmap = msdosfs_bmap, 1940 .vop_getpages = msdosfs_getpages, 1941 .vop_cachedlookup = msdosfs_lookup, 1942 .vop_open = msdosfs_open, 1943 .vop_close = msdosfs_close, 1944 .vop_create = msdosfs_create, 1945 .vop_fsync = msdosfs_fsync, 1946 .vop_fdatasync = vop_stdfdatasync_buf, 1947 .vop_getattr = msdosfs_getattr, 1948 .vop_inactive = msdosfs_inactive, 1949 .vop_link = msdosfs_link, 1950 .vop_lookup = vfs_cache_lookup, 1951 .vop_mkdir = msdosfs_mkdir, 1952 .vop_mknod = msdosfs_mknod, 1953 .vop_pathconf = msdosfs_pathconf, 1954 .vop_print = msdosfs_print, 1955 .vop_read = msdosfs_read, 1956 .vop_readdir = msdosfs_readdir, 1957 .vop_reclaim = msdosfs_reclaim, 1958 .vop_remove = msdosfs_remove, 1959 .vop_rename = msdosfs_rename, 1960 .vop_rmdir = msdosfs_rmdir, 1961 .vop_setattr = msdosfs_setattr, 1962 .vop_strategy = msdosfs_strategy, 1963 .vop_symlink = msdosfs_symlink, 1964 .vop_write = msdosfs_write, 1965 .vop_vptofh = msdosfs_vptofh, 1966 };
Cache object: ecee0af5f585525ab0310065cf9dea04
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