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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/proc.h> 65 #include <sys/resourcevar.h> 66 #include <sys/signalvar.h> 67 #include <sys/stat.h> 68 #include <sys/unistd.h> 69 #include <sys/vnode.h> 70 71 #include <vm/vm.h> 72 #include <vm/vm_extern.h> 73 74 #include <fs/msdosfs/bpb.h> 75 #include <fs/msdosfs/direntry.h> 76 #include <fs/msdosfs/denode.h> 77 #include <fs/msdosfs/fat.h> 78 #include <fs/msdosfs/msdosfsmount.h> 79 80 #define DOS_FILESIZE_MAX 0xffffffff 81 82 /* 83 * Prototypes for MSDOSFS vnode operations 84 */ 85 static vop_advlock_t msdosfs_advlock; 86 static vop_create_t msdosfs_create; 87 static vop_mknod_t msdosfs_mknod; 88 static vop_open_t msdosfs_open; 89 static vop_close_t msdosfs_close; 90 static vop_access_t msdosfs_access; 91 static vop_getattr_t msdosfs_getattr; 92 static vop_setattr_t msdosfs_setattr; 93 static vop_read_t msdosfs_read; 94 static vop_write_t msdosfs_write; 95 static vop_fsync_t msdosfs_fsync; 96 static vop_remove_t msdosfs_remove; 97 static vop_link_t msdosfs_link; 98 static vop_rename_t msdosfs_rename; 99 static vop_mkdir_t msdosfs_mkdir; 100 static vop_rmdir_t msdosfs_rmdir; 101 static vop_symlink_t msdosfs_symlink; 102 static vop_readdir_t msdosfs_readdir; 103 static vop_bmap_t msdosfs_bmap; 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 * retreive 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(ap) 135 struct vop_create_args /* { 136 struct vnode *a_dvp; 137 struct vnode **a_vpp; 138 struct componentname *a_cnp; 139 struct vattr *a_vap; 140 } */ *ap; 141 { 142 struct componentname *cnp = ap->a_cnp; 143 struct denode ndirent; 144 struct denode *dep; 145 struct denode *pdep = VTODE(ap->a_dvp); 146 struct timespec ts; 147 int error; 148 149 #ifdef MSDOSFS_DEBUG 150 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 151 #endif 152 153 /* 154 * If this is the root directory and there is no space left we 155 * can't do anything. This is because the root directory can not 156 * change size. 157 */ 158 if (pdep->de_StartCluster == MSDOSFSROOT 159 && pdep->de_fndoffset >= pdep->de_FileSize) { 160 error = ENOSPC; 161 goto bad; 162 } 163 164 /* 165 * Create a directory entry for the file, then call createde() to 166 * have it installed. NOTE: DOS files are always executable. We 167 * use the absence of the owner write bit to make the file 168 * readonly. 169 */ 170 #ifdef DIAGNOSTIC 171 if ((cnp->cn_flags & HASBUF) == 0) 172 panic("msdosfs_create: no name"); 173 #endif 174 bzero(&ndirent, sizeof(ndirent)); 175 error = uniqdosname(pdep, cnp, ndirent.de_Name); 176 if (error) 177 goto bad; 178 179 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 180 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 181 ndirent.de_LowerCase = 0; 182 ndirent.de_StartCluster = 0; 183 ndirent.de_FileSize = 0; 184 ndirent.de_dev = pdep->de_dev; 185 ndirent.de_pmp = pdep->de_pmp; 186 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 187 getnanotime(&ts); 188 DETIMES(&ndirent, &ts, &ts, &ts); 189 error = createde(&ndirent, pdep, &dep, cnp); 190 if (error) 191 goto bad; 192 *ap->a_vpp = DETOV(dep); 193 return (0); 194 195 bad: 196 return (error); 197 } 198 199 static int 200 msdosfs_mknod(ap) 201 struct vop_mknod_args /* { 202 struct vnode *a_dvp; 203 struct vnode **a_vpp; 204 struct componentname *a_cnp; 205 struct vattr *a_vap; 206 } */ *ap; 207 { 208 209 return (EINVAL); 210 } 211 212 static int 213 msdosfs_open(ap) 214 struct vop_open_args /* { 215 struct vnode *a_vp; 216 int a_mode; 217 struct ucred *a_cred; 218 struct thread *a_td; 219 int a_fdidx; 220 } */ *ap; 221 { 222 struct denode *dep = VTODE(ap->a_vp); 223 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 224 return 0; 225 } 226 227 static int 228 msdosfs_close(ap) 229 struct vop_close_args /* { 230 struct vnode *a_vp; 231 int a_fflag; 232 struct ucred *a_cred; 233 struct thread *a_td; 234 } */ *ap; 235 { 236 struct vnode *vp = ap->a_vp; 237 struct denode *dep = VTODE(vp); 238 struct timespec ts; 239 240 VI_LOCK(vp); 241 if (vp->v_usecount > 1) { 242 getnanotime(&ts); 243 DETIMES(dep, &ts, &ts, &ts); 244 } 245 VI_UNLOCK(vp); 246 return 0; 247 } 248 249 static int 250 msdosfs_access(ap) 251 struct vop_access_args /* { 252 struct vnode *a_vp; 253 int a_mode; 254 struct ucred *a_cred; 255 struct thread *a_td; 256 } */ *ap; 257 { 258 struct vnode *vp = ap->a_vp; 259 struct denode *dep = VTODE(ap->a_vp); 260 struct msdosfsmount *pmp = dep->de_pmp; 261 mode_t file_mode, mode = ap->a_mode; 262 263 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 264 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 265 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 266 267 /* 268 * Disallow writing to directories and regular files if the 269 * filesystem is read-only. 270 */ 271 if (mode & VWRITE) { 272 switch (vp->v_type) { 273 case VDIR: 274 case VREG: 275 if (vp->v_mount->mnt_flag & MNT_RDONLY) 276 return (EROFS); 277 break; 278 default: 279 break; 280 } 281 } 282 283 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 284 ap->a_mode, ap->a_cred, NULL)); 285 } 286 287 static int 288 msdosfs_getattr(ap) 289 struct vop_getattr_args /* { 290 struct vnode *a_vp; 291 struct vattr *a_vap; 292 struct ucred *a_cred; 293 struct thread *a_td; 294 } */ *ap; 295 { 296 struct denode *dep = VTODE(ap->a_vp); 297 struct msdosfsmount *pmp = dep->de_pmp; 298 struct vattr *vap = ap->a_vap; 299 mode_t mode; 300 struct timespec ts; 301 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 302 uint64_t fileid; 303 304 getnanotime(&ts); 305 DETIMES(dep, &ts, &ts, &ts); 306 vap->va_fsid = dev2udev(dep->de_dev); 307 /* 308 * The following computation of the fileid must be the same as that 309 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 310 * doesn't work. 311 */ 312 if (dep->de_Attributes & ATTR_DIRECTORY) { 313 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 314 dirsperblk; 315 if (dep->de_StartCluster == MSDOSFSROOT) 316 fileid = 1; 317 } else { 318 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 319 dirsperblk; 320 if (dep->de_dirclust == MSDOSFSROOT) 321 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 322 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 323 } 324 325 if (pmp->pm_flags & MSDOSFS_LARGEFS) 326 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 327 else 328 vap->va_fileid = (long)fileid; 329 330 if ((dep->de_Attributes & ATTR_READONLY) == 0) 331 mode = S_IRWXU|S_IRWXG|S_IRWXO; 332 else 333 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 334 vap->va_mode = mode & 335 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 336 vap->va_uid = pmp->pm_uid; 337 vap->va_gid = pmp->pm_gid; 338 vap->va_nlink = 1; 339 vap->va_rdev = 0; 340 vap->va_size = dep->de_FileSize; 341 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 342 vap->va_ctime = vap->va_mtime; 343 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 344 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 345 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 346 0, &vap->va_birthtime); 347 } else { 348 vap->va_atime = vap->va_mtime; 349 vap->va_birthtime.tv_sec = -1; 350 vap->va_birthtime.tv_nsec = 0; 351 } 352 vap->va_flags = 0; 353 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 354 vap->va_flags |= SF_ARCHIVED; 355 vap->va_gen = 0; 356 vap->va_blocksize = pmp->pm_bpcluster; 357 vap->va_bytes = 358 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 359 vap->va_type = ap->a_vp->v_type; 360 vap->va_filerev = dep->de_modrev; 361 return (0); 362 } 363 364 static int 365 msdosfs_setattr(ap) 366 struct vop_setattr_args /* { 367 struct vnode *a_vp; 368 struct vattr *a_vap; 369 struct ucred *a_cred; 370 struct thread *a_td; 371 } */ *ap; 372 { 373 struct vnode *vp = ap->a_vp; 374 struct denode *dep = VTODE(ap->a_vp); 375 struct msdosfsmount *pmp = dep->de_pmp; 376 struct vattr *vap = ap->a_vap; 377 struct ucred *cred = ap->a_cred; 378 int error = 0; 379 380 #ifdef MSDOSFS_DEBUG 381 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 382 ap->a_vp, vap, cred, ap->a_td); 383 #endif 384 385 /* 386 * Check for unsettable attributes. 387 */ 388 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 389 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 390 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 391 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 392 #ifdef MSDOSFS_DEBUG 393 printf("msdosfs_setattr(): returning EINVAL\n"); 394 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 395 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 396 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 397 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 398 printf(" va_uid %x, va_gid %x\n", 399 vap->va_uid, vap->va_gid); 400 #endif 401 return (EINVAL); 402 } 403 if (vap->va_flags != VNOVAL) { 404 if (vp->v_mount->mnt_flag & MNT_RDONLY) 405 return (EROFS); 406 if (cred->cr_uid != pmp->pm_uid) { 407 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 408 if (error) 409 return (error); 410 } 411 /* 412 * We are very inconsistent about handling unsupported 413 * attributes. We ignored the access time and the 414 * read and execute bits. We were strict for the other 415 * attributes. 416 * 417 * Here we are strict, stricter than ufs in not allowing 418 * users to attempt to set SF_SETTABLE bits or anyone to 419 * set unsupported bits. However, we ignore attempts to 420 * set ATTR_ARCHIVE for directories `cp -pr' from a more 421 * sensible filesystem attempts it a lot. 422 */ 423 if (vap->va_flags & SF_SETTABLE) { 424 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0); 425 if (error) 426 return (error); 427 } 428 if (vap->va_flags & ~SF_ARCHIVED) 429 return EOPNOTSUPP; 430 if (vap->va_flags & SF_ARCHIVED) 431 dep->de_Attributes &= ~ATTR_ARCHIVE; 432 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 433 dep->de_Attributes |= ATTR_ARCHIVE; 434 dep->de_flag |= DE_MODIFIED; 435 } 436 437 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 438 uid_t uid; 439 gid_t gid; 440 441 if (vp->v_mount->mnt_flag & MNT_RDONLY) 442 return (EROFS); 443 uid = vap->va_uid; 444 if (uid == (uid_t)VNOVAL) 445 uid = pmp->pm_uid; 446 gid = vap->va_gid; 447 if (gid == (gid_t)VNOVAL) 448 gid = pmp->pm_gid; 449 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 450 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 451 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 452 if (error) 453 return (error); 454 } 455 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 456 return EINVAL; 457 } 458 459 if (vap->va_size != VNOVAL) { 460 switch (vp->v_type) { 461 case VDIR: 462 return (EISDIR); 463 case VREG: 464 /* 465 * Truncation is only supported for regular files, 466 * Disallow it if the filesystem is read-only. 467 */ 468 if (vp->v_mount->mnt_flag & MNT_RDONLY) 469 return (EROFS); 470 break; 471 default: 472 /* 473 * According to POSIX, the result is unspecified 474 * for file types other than regular files, 475 * directories and shared memory objects. We 476 * don't support any file types except regular 477 * files and directories in this file system, so 478 * this (default) case is unreachable and can do 479 * anything. Keep falling through to detrunc() 480 * for now. 481 */ 482 break; 483 } 484 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td); 485 if (error) 486 return error; 487 } 488 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 489 if (vp->v_mount->mnt_flag & MNT_RDONLY) 490 return (EROFS); 491 if (vap->va_vaflags & VA_UTIMES_NULL) { 492 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td); 493 if (error) 494 error = VOP_ACCESS(vp, VWRITE, cred, 495 ap->a_td); 496 } else 497 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td); 498 if (vp->v_type != VDIR) { 499 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 500 vap->va_atime.tv_sec != VNOVAL) { 501 dep->de_flag &= ~DE_ACCESS; 502 timespec2fattime(&vap->va_atime, 0, 503 &dep->de_ADate, NULL, NULL); 504 } 505 if (vap->va_mtime.tv_sec != VNOVAL) { 506 dep->de_flag &= ~DE_UPDATE; 507 timespec2fattime(&vap->va_mtime, 0, 508 &dep->de_MDate, &dep->de_MTime, NULL); 509 } 510 dep->de_Attributes |= ATTR_ARCHIVE; 511 dep->de_flag |= DE_MODIFIED; 512 } 513 } 514 /* 515 * DOS files only have the ability to have their writability 516 * attribute set, so we use the owner write bit to set the readonly 517 * attribute. 518 */ 519 if (vap->va_mode != (mode_t)VNOVAL) { 520 if (vp->v_mount->mnt_flag & MNT_RDONLY) 521 return (EROFS); 522 if (cred->cr_uid != pmp->pm_uid) { 523 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 524 if (error) 525 return (error); 526 } 527 if (vp->v_type != VDIR) { 528 /* We ignore the read and execute bits. */ 529 if (vap->va_mode & VWRITE) 530 dep->de_Attributes &= ~ATTR_READONLY; 531 else 532 dep->de_Attributes |= ATTR_READONLY; 533 dep->de_Attributes |= ATTR_ARCHIVE; 534 dep->de_flag |= DE_MODIFIED; 535 } 536 } 537 return (deupdat(dep, 1)); 538 } 539 540 static int 541 msdosfs_read(ap) 542 struct vop_read_args /* { 543 struct vnode *a_vp; 544 struct uio *a_uio; 545 int a_ioflag; 546 struct ucred *a_cred; 547 } */ *ap; 548 { 549 int error = 0; 550 int blsize; 551 int isadir; 552 int orig_resid; 553 u_int n; 554 u_long diff; 555 u_long on; 556 daddr_t lbn; 557 daddr_t rablock; 558 int rasize; 559 int seqcount; 560 struct buf *bp; 561 struct vnode *vp = ap->a_vp; 562 struct denode *dep = VTODE(vp); 563 struct msdosfsmount *pmp = dep->de_pmp; 564 struct uio *uio = ap->a_uio; 565 566 /* 567 * If they didn't ask for any data, then we are done. 568 */ 569 orig_resid = uio->uio_resid; 570 if (orig_resid == 0) 571 return (0); 572 573 /* 574 * The caller is supposed to ensure that 575 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 576 * We don't need to check for large offsets as in ffs because 577 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large 578 * offsets cannot cause overflow even in theory. 579 */ 580 581 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 582 583 isadir = dep->de_Attributes & ATTR_DIRECTORY; 584 do { 585 if (uio->uio_offset >= dep->de_FileSize) 586 break; 587 lbn = de_cluster(pmp, uio->uio_offset); 588 rablock = lbn + 1; 589 blsize = pmp->pm_bpcluster; 590 on = uio->uio_offset & pmp->pm_crbomask; 591 /* 592 * If we are operating on a directory file then be sure to 593 * do i/o with the vnode for the filesystem instead of the 594 * vnode for the directory. 595 */ 596 if (isadir) { 597 /* convert cluster # to block # */ 598 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 599 if (error == E2BIG) { 600 error = EINVAL; 601 break; 602 } else if (error) 603 break; 604 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 605 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 606 error = bread(vp, lbn, blsize, NOCRED, &bp); 607 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 608 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 609 NOCRED, on + uio->uio_resid, seqcount, &bp); 610 } else if (seqcount > 1) { 611 rasize = blsize; 612 error = breadn(vp, lbn, 613 blsize, &rablock, &rasize, 1, NOCRED, &bp); 614 } else { 615 error = bread(vp, lbn, blsize, NOCRED, &bp); 616 } 617 if (error) { 618 brelse(bp); 619 break; 620 } 621 diff = pmp->pm_bpcluster - on; 622 n = diff > uio->uio_resid ? uio->uio_resid : diff; 623 diff = dep->de_FileSize - uio->uio_offset; 624 if (diff < n) 625 n = diff; 626 diff = blsize - bp->b_resid; 627 if (diff < n) 628 n = diff; 629 error = uiomove(bp->b_data + on, (int) n, uio); 630 brelse(bp); 631 } while (error == 0 && uio->uio_resid > 0 && n != 0); 632 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 633 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 634 dep->de_flag |= DE_ACCESS; 635 return (error); 636 } 637 638 /* 639 * Write data to a file or directory. 640 */ 641 static int 642 msdosfs_write(ap) 643 struct vop_write_args /* { 644 struct vnode *a_vp; 645 struct uio *a_uio; 646 int a_ioflag; 647 struct ucred *a_cred; 648 } */ *ap; 649 { 650 int n; 651 int croffset; 652 int resid; 653 u_long osize; 654 int error = 0; 655 u_long count; 656 int seqcount; 657 daddr_t bn, lastcn; 658 struct buf *bp; 659 int ioflag = ap->a_ioflag; 660 struct uio *uio = ap->a_uio; 661 struct thread *td = uio->uio_td; 662 struct vnode *vp = ap->a_vp; 663 struct vnode *thisvp; 664 struct denode *dep = VTODE(vp); 665 struct msdosfsmount *pmp = dep->de_pmp; 666 struct ucred *cred = ap->a_cred; 667 668 #ifdef MSDOSFS_DEBUG 669 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 670 vp, uio, ioflag, cred); 671 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 672 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 673 #endif 674 675 switch (vp->v_type) { 676 case VREG: 677 if (ioflag & IO_APPEND) 678 uio->uio_offset = dep->de_FileSize; 679 thisvp = vp; 680 break; 681 case VDIR: 682 return EISDIR; 683 default: 684 panic("msdosfs_write(): bad file type"); 685 } 686 687 /* 688 * This is needed (unlike in ffs_write()) because we extend the 689 * file outside of the loop but we don't want to extend the file 690 * for writes of 0 bytes. 691 */ 692 if (uio->uio_resid == 0) 693 return (0); 694 695 /* 696 * The caller is supposed to ensure that 697 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 698 */ 699 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 700 return (EFBIG); 701 702 /* 703 * If they've exceeded their filesize limit, tell them about it. 704 */ 705 if (td != NULL) { 706 PROC_LOCK(td->td_proc); 707 if ((uoff_t)uio->uio_offset + uio->uio_resid > 708 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 709 psignal(td->td_proc, SIGXFSZ); 710 PROC_UNLOCK(td->td_proc); 711 return (EFBIG); 712 } 713 PROC_UNLOCK(td->td_proc); 714 } 715 716 /* 717 * If the offset we are starting the write at is beyond the end of 718 * the file, then they've done a seek. Unix filesystems allow 719 * files with holes in them, DOS doesn't so we must fill the hole 720 * with zeroed blocks. 721 */ 722 if (uio->uio_offset > dep->de_FileSize) { 723 error = deextend(dep, uio->uio_offset, cred); 724 if (error) 725 return (error); 726 } 727 728 /* 729 * Remember some values in case the write fails. 730 */ 731 resid = uio->uio_resid; 732 osize = dep->de_FileSize; 733 734 /* 735 * If we write beyond the end of the file, extend it to its ultimate 736 * size ahead of the time to hopefully get a contiguous area. 737 */ 738 if (uio->uio_offset + resid > osize) { 739 count = de_clcount(pmp, uio->uio_offset + resid) - 740 de_clcount(pmp, osize); 741 error = extendfile(dep, count, NULL, NULL, 0); 742 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 743 goto errexit; 744 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 745 } else 746 lastcn = de_clcount(pmp, osize) - 1; 747 748 seqcount = ioflag >> IO_SEQSHIFT; 749 do { 750 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 751 error = ENOSPC; 752 break; 753 } 754 755 croffset = uio->uio_offset & pmp->pm_crbomask; 756 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 757 if (uio->uio_offset + n > dep->de_FileSize) { 758 dep->de_FileSize = uio->uio_offset + n; 759 /* The object size needs to be set before buffer is allocated */ 760 vnode_pager_setsize(vp, dep->de_FileSize); 761 } 762 763 bn = de_cluster(pmp, uio->uio_offset); 764 if ((uio->uio_offset & pmp->pm_crbomask) == 0 765 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 766 > de_cluster(pmp, uio->uio_offset) 767 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 768 /* 769 * If either the whole cluster gets written, 770 * or we write the cluster from its start beyond EOF, 771 * then no need to read data from disk. 772 */ 773 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 774 vfs_bio_clrbuf(bp); 775 /* 776 * Do the bmap now, since pcbmap needs buffers 777 * for the fat table. (see msdosfs_strategy) 778 */ 779 if (bp->b_blkno == bp->b_lblkno) { 780 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 781 if (error) 782 bp->b_blkno = -1; 783 else 784 bp->b_blkno = bn; 785 } 786 if (bp->b_blkno == -1) { 787 brelse(bp); 788 if (!error) 789 error = EIO; /* XXX */ 790 break; 791 } 792 } else { 793 /* 794 * The block we need to write into exists, so read it in. 795 */ 796 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 797 if (error) { 798 brelse(bp); 799 break; 800 } 801 } 802 803 /* 804 * Should these vnode_pager_* functions be done on dir 805 * files? 806 */ 807 808 /* 809 * Copy the data from user space into the buf header. 810 */ 811 error = uiomove(bp->b_data + croffset, n, uio); 812 if (error) { 813 brelse(bp); 814 break; 815 } 816 817 /* Prepare for clustered writes in some else clauses. */ 818 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 819 bp->b_flags |= B_CLUSTEROK; 820 821 /* 822 * If IO_SYNC, then each buffer is written synchronously. 823 * Otherwise, if we have a severe page deficiency then 824 * write the buffer asynchronously. Otherwise, if on a 825 * cluster boundary then write the buffer asynchronously, 826 * combining it with contiguous clusters if permitted and 827 * possible, since we don't expect more writes into this 828 * buffer soon. Otherwise, do a delayed write because we 829 * expect more writes into this buffer soon. 830 */ 831 if (ioflag & IO_SYNC) 832 (void)bwrite(bp); 833 else if (vm_page_count_severe() || buf_dirty_count_severe()) 834 bawrite(bp); 835 else if (n + croffset == pmp->pm_bpcluster) { 836 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 837 cluster_write(vp, bp, dep->de_FileSize, 838 seqcount); 839 else 840 bawrite(bp); 841 } else 842 bdwrite(bp); 843 dep->de_flag |= DE_UPDATE; 844 } while (error == 0 && uio->uio_resid > 0); 845 846 /* 847 * If the write failed and they want us to, truncate the file back 848 * to the size it was before the write was attempted. 849 */ 850 errexit: 851 if (error) { 852 if (ioflag & IO_UNIT) { 853 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 854 uio->uio_offset -= resid - uio->uio_resid; 855 uio->uio_resid = resid; 856 } else { 857 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 858 if (uio->uio_resid != resid) 859 error = 0; 860 } 861 } else if (ioflag & IO_SYNC) 862 error = deupdat(dep, 1); 863 return (error); 864 } 865 866 /* 867 * Flush the blocks of a file to disk. 868 * 869 * This function is worthless for vnodes that represent directories. Maybe we 870 * could just do a sync if they try an fsync on a directory file. 871 */ 872 static int 873 msdosfs_fsync(ap) 874 struct vop_fsync_args /* { 875 struct vnode *a_vp; 876 struct ucred *a_cred; 877 int a_waitfor; 878 struct thread *a_td; 879 } */ *ap; 880 { 881 882 vop_stdfsync(ap); 883 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT)); 884 } 885 886 static int 887 msdosfs_remove(ap) 888 struct vop_remove_args /* { 889 struct vnode *a_dvp; 890 struct vnode *a_vp; 891 struct componentname *a_cnp; 892 } */ *ap; 893 { 894 struct denode *dep = VTODE(ap->a_vp); 895 struct denode *ddep = VTODE(ap->a_dvp); 896 int error; 897 898 if (ap->a_vp->v_type == VDIR) 899 error = EPERM; 900 else 901 error = removede(ddep, dep); 902 #ifdef MSDOSFS_DEBUG 903 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 904 #endif 905 return (error); 906 } 907 908 /* 909 * DOS filesystems don't know what links are. 910 */ 911 static int 912 msdosfs_link(ap) 913 struct vop_link_args /* { 914 struct vnode *a_tdvp; 915 struct vnode *a_vp; 916 struct componentname *a_cnp; 917 } */ *ap; 918 { 919 return (EOPNOTSUPP); 920 } 921 922 /* 923 * Renames on files require moving the denode to a new hash queue since the 924 * denode's location is used to compute which hash queue to put the file 925 * in. Unless it is a rename in place. For example "mv a b". 926 * 927 * What follows is the basic algorithm: 928 * 929 * if (file move) { 930 * if (dest file exists) { 931 * remove dest file 932 * } 933 * if (dest and src in same directory) { 934 * rewrite name in existing directory slot 935 * } else { 936 * write new entry in dest directory 937 * update offset and dirclust in denode 938 * move denode to new hash chain 939 * clear old directory entry 940 * } 941 * } else { 942 * directory move 943 * if (dest directory exists) { 944 * if (dest is not empty) { 945 * return ENOTEMPTY 946 * } 947 * remove dest directory 948 * } 949 * if (dest and src in same directory) { 950 * rewrite name in existing entry 951 * } else { 952 * be sure dest is not a child of src directory 953 * write entry in dest directory 954 * update "." and ".." in moved directory 955 * clear old directory entry for moved directory 956 * } 957 * } 958 * 959 * On entry: 960 * source's parent directory is unlocked 961 * source file or directory is unlocked 962 * destination's parent directory is locked 963 * destination file or directory is locked if it exists 964 * 965 * On exit: 966 * all denodes should be released 967 */ 968 static int 969 msdosfs_rename(ap) 970 struct vop_rename_args /* { 971 struct vnode *a_fdvp; 972 struct vnode *a_fvp; 973 struct componentname *a_fcnp; 974 struct vnode *a_tdvp; 975 struct vnode *a_tvp; 976 struct componentname *a_tcnp; 977 } */ *ap; 978 { 979 struct vnode *tdvp = ap->a_tdvp; 980 struct vnode *fvp = ap->a_fvp; 981 struct vnode *fdvp = ap->a_fdvp; 982 struct vnode *tvp = ap->a_tvp; 983 struct componentname *tcnp = ap->a_tcnp; 984 struct componentname *fcnp = ap->a_fcnp; 985 struct thread *td = fcnp->cn_thread; 986 struct denode *ip, *xp, *dp, *zp; 987 u_char toname[11], oldname[11]; 988 u_long from_diroffset, to_diroffset; 989 u_char to_count; 990 int doingdirectory = 0, newparent = 0; 991 int error; 992 u_long cn; 993 daddr_t bn; 994 struct denode *fddep; /* from file's parent directory */ 995 struct msdosfsmount *pmp; 996 struct direntry *dotdotp; 997 struct buf *bp; 998 999 fddep = VTODE(ap->a_fdvp); 1000 pmp = fddep->de_pmp; 1001 1002 pmp = VFSTOMSDOSFS(fdvp->v_mount); 1003 1004 #ifdef DIAGNOSTIC 1005 if ((tcnp->cn_flags & HASBUF) == 0 || 1006 (fcnp->cn_flags & HASBUF) == 0) 1007 panic("msdosfs_rename: no name"); 1008 #endif 1009 /* 1010 * Check for cross-device rename. 1011 */ 1012 if (fvp->v_mount != tdvp->v_mount || 1013 (tvp && fvp->v_mount != tvp->v_mount)) { 1014 error = EXDEV; 1015 abortit: 1016 if (tdvp == tvp) 1017 vrele(tdvp); 1018 else 1019 vput(tdvp); 1020 if (tvp) 1021 vput(tvp); 1022 vrele(fdvp); 1023 vrele(fvp); 1024 return (error); 1025 } 1026 1027 /* 1028 * If source and dest are the same, do nothing. 1029 */ 1030 if (tvp == fvp) { 1031 error = 0; 1032 goto abortit; 1033 } 1034 1035 error = vn_lock(fvp, LK_EXCLUSIVE, td); 1036 if (error) 1037 goto abortit; 1038 dp = VTODE(fdvp); 1039 ip = VTODE(fvp); 1040 1041 /* 1042 * Be sure we are not renaming ".", "..", or an alias of ".". This 1043 * leads to a crippled directory tree. It's pretty tough to do a 1044 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1045 * doesn't work if the ".." entry is missing. 1046 */ 1047 if (ip->de_Attributes & ATTR_DIRECTORY) { 1048 /* 1049 * Avoid ".", "..", and aliases of "." for obvious reasons. 1050 */ 1051 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1052 dp == ip || 1053 (fcnp->cn_flags & ISDOTDOT) || 1054 (tcnp->cn_flags & ISDOTDOT) || 1055 (ip->de_flag & DE_RENAME)) { 1056 VOP_UNLOCK(fvp, 0, td); 1057 error = EINVAL; 1058 goto abortit; 1059 } 1060 ip->de_flag |= DE_RENAME; 1061 doingdirectory++; 1062 } 1063 1064 /* 1065 * When the target exists, both the directory 1066 * and target vnodes are returned locked. 1067 */ 1068 dp = VTODE(tdvp); 1069 xp = tvp ? VTODE(tvp) : NULL; 1070 /* 1071 * Remember direntry place to use for destination 1072 */ 1073 to_diroffset = dp->de_fndoffset; 1074 to_count = dp->de_fndcnt; 1075 1076 /* 1077 * If ".." must be changed (ie the directory gets a new 1078 * parent) then the source directory must not be in the 1079 * directory heirarchy above the target, as this would 1080 * orphan everything below the source directory. Also 1081 * the user must have write permission in the source so 1082 * as to be able to change "..". We must repeat the call 1083 * to namei, as the parent directory is unlocked by the 1084 * call to doscheckpath(). 1085 */ 1086 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1087 VOP_UNLOCK(fvp, 0, td); 1088 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1089 newparent = 1; 1090 if (doingdirectory && newparent) { 1091 if (error) /* write access check above */ 1092 goto bad; 1093 if (xp != NULL) 1094 vput(tvp); 1095 /* 1096 * doscheckpath() vput()'s dp, 1097 * so we have to do a relookup afterwards 1098 */ 1099 error = doscheckpath(ip, dp); 1100 if (error) 1101 goto out; 1102 if ((tcnp->cn_flags & SAVESTART) == 0) 1103 panic("msdosfs_rename: lost to startdir"); 1104 error = relookup(tdvp, &tvp, tcnp); 1105 if (error) 1106 goto out; 1107 dp = VTODE(tdvp); 1108 xp = tvp ? VTODE(tvp) : NULL; 1109 } 1110 1111 if (xp != NULL) { 1112 /* 1113 * Target must be empty if a directory and have no links 1114 * to it. Also, ensure source and target are compatible 1115 * (both directories, or both not directories). 1116 */ 1117 if (xp->de_Attributes & ATTR_DIRECTORY) { 1118 if (!dosdirempty(xp)) { 1119 error = ENOTEMPTY; 1120 goto bad; 1121 } 1122 if (!doingdirectory) { 1123 error = ENOTDIR; 1124 goto bad; 1125 } 1126 cache_purge(tdvp); 1127 } else if (doingdirectory) { 1128 error = EISDIR; 1129 goto bad; 1130 } 1131 error = removede(dp, xp); 1132 if (error) 1133 goto bad; 1134 vput(tvp); 1135 xp = NULL; 1136 } 1137 1138 /* 1139 * Convert the filename in tcnp into a dos filename. We copy this 1140 * into the denode and directory entry for the destination 1141 * file/directory. 1142 */ 1143 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1144 if (error) 1145 goto abortit; 1146 1147 /* 1148 * Since from wasn't locked at various places above, 1149 * have to do a relookup here. 1150 */ 1151 fcnp->cn_flags &= ~MODMASK; 1152 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1153 if ((fcnp->cn_flags & SAVESTART) == 0) 1154 panic("msdosfs_rename: lost from startdir"); 1155 if (!newparent) 1156 VOP_UNLOCK(tdvp, 0, td); 1157 if (relookup(fdvp, &fvp, fcnp) == 0) 1158 vrele(fdvp); 1159 if (fvp == NULL) { 1160 /* 1161 * From name has disappeared. 1162 */ 1163 if (doingdirectory) 1164 panic("rename: lost dir entry"); 1165 if (newparent) 1166 VOP_UNLOCK(tdvp, 0, td); 1167 vrele(tdvp); 1168 vrele(ap->a_fvp); 1169 return 0; 1170 } 1171 xp = VTODE(fvp); 1172 zp = VTODE(fdvp); 1173 from_diroffset = zp->de_fndoffset; 1174 1175 /* 1176 * Ensure that the directory entry still exists and has not 1177 * changed till now. If the source is a file the entry may 1178 * have been unlinked or renamed. In either case there is 1179 * no further work to be done. If the source is a directory 1180 * then it cannot have been rmdir'ed or renamed; this is 1181 * prohibited by the DE_RENAME flag. 1182 */ 1183 if (xp != ip) { 1184 if (doingdirectory) 1185 panic("rename: lost dir entry"); 1186 VOP_UNLOCK(fvp, 0, td); 1187 if (newparent) 1188 VOP_UNLOCK(fdvp, 0, td); 1189 vrele(ap->a_fvp); 1190 xp = NULL; 1191 } else { 1192 vrele(fvp); 1193 xp = NULL; 1194 1195 /* 1196 * First write a new entry in the destination 1197 * directory and mark the entry in the source directory 1198 * as deleted. Then move the denode to the correct hash 1199 * chain for its new location in the filesystem. And, if 1200 * we moved a directory, then update its .. entry to point 1201 * to the new parent directory. 1202 */ 1203 bcopy(ip->de_Name, oldname, 11); 1204 bcopy(toname, ip->de_Name, 11); /* update denode */ 1205 dp->de_fndoffset = to_diroffset; 1206 dp->de_fndcnt = to_count; 1207 error = createde(ip, dp, (struct denode **)0, tcnp); 1208 if (error) { 1209 bcopy(oldname, ip->de_Name, 11); 1210 if (newparent) 1211 VOP_UNLOCK(fdvp, 0, td); 1212 VOP_UNLOCK(fvp, 0, td); 1213 goto bad; 1214 } 1215 ip->de_refcnt++; 1216 zp->de_fndoffset = from_diroffset; 1217 error = removede(zp, ip); 1218 if (error) { 1219 /* XXX should downgrade to ro here, fs is corrupt */ 1220 if (newparent) 1221 VOP_UNLOCK(fdvp, 0, td); 1222 VOP_UNLOCK(fvp, 0, td); 1223 goto bad; 1224 } 1225 if (!doingdirectory) { 1226 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1227 &ip->de_dirclust, 0); 1228 if (error) { 1229 /* XXX should downgrade to ro here, fs is corrupt */ 1230 if (newparent) 1231 VOP_UNLOCK(fdvp, 0, td); 1232 VOP_UNLOCK(fvp, 0, td); 1233 goto bad; 1234 } 1235 if (ip->de_dirclust == MSDOSFSROOT) 1236 ip->de_diroffset = to_diroffset; 1237 else 1238 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1239 } 1240 reinsert(ip); 1241 if (newparent) 1242 VOP_UNLOCK(fdvp, 0, td); 1243 } 1244 1245 /* 1246 * If we moved a directory to a new parent directory, then we must 1247 * fixup the ".." entry in the moved directory. 1248 */ 1249 if (doingdirectory && newparent) { 1250 cn = ip->de_StartCluster; 1251 if (cn == MSDOSFSROOT) { 1252 /* this should never happen */ 1253 panic("msdosfs_rename(): updating .. in root directory?"); 1254 } else 1255 bn = cntobn(pmp, cn); 1256 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1257 NOCRED, &bp); 1258 if (error) { 1259 /* XXX should downgrade to ro here, fs is corrupt */ 1260 brelse(bp); 1261 VOP_UNLOCK(fvp, 0, td); 1262 goto bad; 1263 } 1264 dotdotp = (struct direntry *)bp->b_data + 1; 1265 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1266 if (FAT32(pmp)) 1267 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1268 error = bwrite(bp); 1269 if (error) { 1270 /* XXX should downgrade to ro here, fs is corrupt */ 1271 VOP_UNLOCK(fvp, 0, td); 1272 goto bad; 1273 } 1274 } 1275 1276 VOP_UNLOCK(fvp, 0, td); 1277 bad: 1278 if (xp) 1279 vput(tvp); 1280 vput(tdvp); 1281 out: 1282 ip->de_flag &= ~DE_RENAME; 1283 vrele(fdvp); 1284 vrele(fvp); 1285 return (error); 1286 1287 } 1288 1289 static struct { 1290 struct direntry dot; 1291 struct direntry dotdot; 1292 } dosdirtemplate = { 1293 { ". ", " ", /* the . entry */ 1294 ATTR_DIRECTORY, /* file attribute */ 1295 0, /* reserved */ 1296 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1297 { 0, 0 }, /* access date */ 1298 { 0, 0 }, /* high bits of start cluster */ 1299 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1300 { 0, 0 }, /* startcluster */ 1301 { 0, 0, 0, 0 } /* filesize */ 1302 }, 1303 { ".. ", " ", /* the .. entry */ 1304 ATTR_DIRECTORY, /* file attribute */ 1305 0, /* reserved */ 1306 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1307 { 0, 0 }, /* access date */ 1308 { 0, 0 }, /* high bits of start cluster */ 1309 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1310 { 0, 0 }, /* startcluster */ 1311 { 0, 0, 0, 0 } /* filesize */ 1312 } 1313 }; 1314 1315 static int 1316 msdosfs_mkdir(ap) 1317 struct vop_mkdir_args /* { 1318 struct vnode *a_dvp; 1319 struct vnode **a_vpp; 1320 struvt componentname *a_cnp; 1321 struct vattr *a_vap; 1322 } */ *ap; 1323 { 1324 struct componentname *cnp = ap->a_cnp; 1325 struct denode *dep; 1326 struct denode *pdep = VTODE(ap->a_dvp); 1327 struct direntry *denp; 1328 struct msdosfsmount *pmp = pdep->de_pmp; 1329 struct buf *bp; 1330 u_long newcluster, pcl; 1331 int bn; 1332 int error; 1333 struct denode ndirent; 1334 struct timespec ts; 1335 1336 /* 1337 * If this is the root directory and there is no space left we 1338 * can't do anything. This is because the root directory can not 1339 * change size. 1340 */ 1341 if (pdep->de_StartCluster == MSDOSFSROOT 1342 && pdep->de_fndoffset >= pdep->de_FileSize) { 1343 error = ENOSPC; 1344 goto bad2; 1345 } 1346 1347 /* 1348 * Allocate a cluster to hold the about to be created directory. 1349 */ 1350 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1351 if (error) 1352 goto bad2; 1353 1354 bzero(&ndirent, sizeof(ndirent)); 1355 ndirent.de_pmp = pmp; 1356 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1357 getnanotime(&ts); 1358 DETIMES(&ndirent, &ts, &ts, &ts); 1359 1360 /* 1361 * Now fill the cluster with the "." and ".." entries. And write 1362 * the cluster to disk. This way it is there for the parent 1363 * directory to be pointing at if there were a crash. 1364 */ 1365 bn = cntobn(pmp, newcluster); 1366 /* always succeeds */ 1367 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1368 bzero(bp->b_data, pmp->pm_bpcluster); 1369 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1370 denp = (struct direntry *)bp->b_data; 1371 putushort(denp[0].deStartCluster, newcluster); 1372 putushort(denp[0].deCDate, ndirent.de_CDate); 1373 putushort(denp[0].deCTime, ndirent.de_CTime); 1374 denp[0].deCHundredth = ndirent.de_CHun; 1375 putushort(denp[0].deADate, ndirent.de_ADate); 1376 putushort(denp[0].deMDate, ndirent.de_MDate); 1377 putushort(denp[0].deMTime, ndirent.de_MTime); 1378 pcl = pdep->de_StartCluster; 1379 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1380 pcl = 0; 1381 putushort(denp[1].deStartCluster, pcl); 1382 putushort(denp[1].deCDate, ndirent.de_CDate); 1383 putushort(denp[1].deCTime, ndirent.de_CTime); 1384 denp[1].deCHundredth = ndirent.de_CHun; 1385 putushort(denp[1].deADate, ndirent.de_ADate); 1386 putushort(denp[1].deMDate, ndirent.de_MDate); 1387 putushort(denp[1].deMTime, ndirent.de_MTime); 1388 if (FAT32(pmp)) { 1389 putushort(denp[0].deHighClust, newcluster >> 16); 1390 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1391 } 1392 1393 error = bwrite(bp); 1394 if (error) 1395 goto bad; 1396 1397 /* 1398 * Now build up a directory entry pointing to the newly allocated 1399 * cluster. This will be written to an empty slot in the parent 1400 * directory. 1401 */ 1402 #ifdef DIAGNOSTIC 1403 if ((cnp->cn_flags & HASBUF) == 0) 1404 panic("msdosfs_mkdir: no name"); 1405 #endif 1406 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1407 if (error) 1408 goto bad; 1409 1410 ndirent.de_Attributes = ATTR_DIRECTORY; 1411 ndirent.de_LowerCase = 0; 1412 ndirent.de_StartCluster = newcluster; 1413 ndirent.de_FileSize = 0; 1414 ndirent.de_dev = pdep->de_dev; 1415 error = createde(&ndirent, pdep, &dep, cnp); 1416 if (error) 1417 goto bad; 1418 *ap->a_vpp = DETOV(dep); 1419 return (0); 1420 1421 bad: 1422 clusterfree(pmp, newcluster, NULL); 1423 bad2: 1424 return (error); 1425 } 1426 1427 static int 1428 msdosfs_rmdir(ap) 1429 struct vop_rmdir_args /* { 1430 struct vnode *a_dvp; 1431 struct vnode *a_vp; 1432 struct componentname *a_cnp; 1433 } */ *ap; 1434 { 1435 struct vnode *vp = ap->a_vp; 1436 struct vnode *dvp = ap->a_dvp; 1437 struct componentname *cnp = ap->a_cnp; 1438 struct denode *ip, *dp; 1439 struct thread *td = cnp->cn_thread; 1440 int error; 1441 1442 ip = VTODE(vp); 1443 dp = VTODE(dvp); 1444 1445 /* 1446 * Verify the directory is empty (and valid). 1447 * (Rmdir ".." won't be valid since 1448 * ".." will contain a reference to 1449 * the current directory and thus be 1450 * non-empty.) 1451 */ 1452 error = 0; 1453 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1454 error = ENOTEMPTY; 1455 goto out; 1456 } 1457 /* 1458 * Delete the entry from the directory. For dos filesystems this 1459 * gets rid of the directory entry on disk, the in memory copy 1460 * still exists but the de_refcnt is <= 0. This prevents it from 1461 * being found by deget(). When the vput() on dep is done we give 1462 * up access and eventually msdosfs_reclaim() will be called which 1463 * will remove it from the denode cache. 1464 */ 1465 error = removede(dp, ip); 1466 if (error) 1467 goto out; 1468 /* 1469 * This is where we decrement the link count in the parent 1470 * directory. Since dos filesystems don't do this we just purge 1471 * the name cache. 1472 */ 1473 cache_purge(dvp); 1474 VOP_UNLOCK(dvp, 0, td); 1475 /* 1476 * Truncate the directory that is being deleted. 1477 */ 1478 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td); 1479 cache_purge(vp); 1480 1481 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 1482 out: 1483 return (error); 1484 } 1485 1486 /* 1487 * DOS filesystems don't know what symlinks are. 1488 */ 1489 static int 1490 msdosfs_symlink(ap) 1491 struct vop_symlink_args /* { 1492 struct vnode *a_dvp; 1493 struct vnode **a_vpp; 1494 struct componentname *a_cnp; 1495 struct vattr *a_vap; 1496 char *a_target; 1497 } */ *ap; 1498 { 1499 return (EOPNOTSUPP); 1500 } 1501 1502 static int 1503 msdosfs_readdir(ap) 1504 struct vop_readdir_args /* { 1505 struct vnode *a_vp; 1506 struct uio *a_uio; 1507 struct ucred *a_cred; 1508 int *a_eofflag; 1509 int *a_ncookies; 1510 u_long **a_cookies; 1511 } */ *ap; 1512 { 1513 struct mbnambuf nb; 1514 int error = 0; 1515 int diff; 1516 long n; 1517 int blsize; 1518 long on; 1519 u_long cn; 1520 uint64_t fileno; 1521 u_long dirsperblk; 1522 long bias = 0; 1523 daddr_t bn, lbn; 1524 struct buf *bp; 1525 struct denode *dep = VTODE(ap->a_vp); 1526 struct msdosfsmount *pmp = dep->de_pmp; 1527 struct direntry *dentp; 1528 struct dirent dirbuf; 1529 struct uio *uio = ap->a_uio; 1530 u_long *cookies = NULL; 1531 int ncookies = 0; 1532 off_t offset, off; 1533 int chksum = -1; 1534 1535 #ifdef MSDOSFS_DEBUG 1536 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1537 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1538 #endif 1539 1540 /* 1541 * msdosfs_readdir() won't operate properly on regular files since 1542 * it does i/o only with the the filesystem vnode, and hence can 1543 * retrieve the wrong block from the buffer cache for a plain file. 1544 * So, fail attempts to readdir() on a plain file. 1545 */ 1546 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1547 return (ENOTDIR); 1548 1549 /* 1550 * To be safe, initialize dirbuf 1551 */ 1552 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1553 1554 /* 1555 * If the user buffer is smaller than the size of one dos directory 1556 * entry or the file offset is not a multiple of the size of a 1557 * directory entry, then we fail the read. 1558 */ 1559 off = offset = uio->uio_offset; 1560 if (uio->uio_resid < sizeof(struct direntry) || 1561 (offset & (sizeof(struct direntry) - 1))) 1562 return (EINVAL); 1563 1564 if (ap->a_ncookies) { 1565 ncookies = uio->uio_resid / 16; 1566 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1567 M_WAITOK); 1568 *ap->a_cookies = cookies; 1569 *ap->a_ncookies = ncookies; 1570 } 1571 1572 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1573 1574 /* 1575 * If they are reading from the root directory then, we simulate 1576 * the . and .. entries since these don't exist in the root 1577 * directory. We also set the offset bias to make up for having to 1578 * simulate these entries. By this I mean that at file offset 64 we 1579 * read the first entry in the root directory that lives on disk. 1580 */ 1581 if (dep->de_StartCluster == MSDOSFSROOT 1582 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1583 #if 0 1584 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1585 offset); 1586 #endif 1587 bias = 2 * sizeof(struct direntry); 1588 if (offset < bias) { 1589 for (n = (int)offset / sizeof(struct direntry); 1590 n < 2; n++) { 1591 if (FAT32(pmp)) 1592 fileno = (uint64_t)cntobn(pmp, 1593 pmp->pm_rootdirblk) 1594 * dirsperblk; 1595 else 1596 fileno = 1; 1597 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1598 dirbuf.d_fileno = 1599 msdosfs_fileno_map(pmp->pm_mountp, 1600 fileno); 1601 } else { 1602 1603 dirbuf.d_fileno = (uint32_t)fileno; 1604 } 1605 dirbuf.d_type = DT_DIR; 1606 switch (n) { 1607 case 0: 1608 dirbuf.d_namlen = 1; 1609 strcpy(dirbuf.d_name, "."); 1610 break; 1611 case 1: 1612 dirbuf.d_namlen = 2; 1613 strcpy(dirbuf.d_name, ".."); 1614 break; 1615 } 1616 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1617 if (uio->uio_resid < dirbuf.d_reclen) 1618 goto out; 1619 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1620 if (error) 1621 goto out; 1622 offset += sizeof(struct direntry); 1623 off = offset; 1624 if (cookies) { 1625 *cookies++ = offset; 1626 if (--ncookies <= 0) 1627 goto out; 1628 } 1629 } 1630 } 1631 } 1632 1633 mbnambuf_init(&nb); 1634 off = offset; 1635 while (uio->uio_resid > 0) { 1636 lbn = de_cluster(pmp, offset - bias); 1637 on = (offset - bias) & pmp->pm_crbomask; 1638 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1639 diff = dep->de_FileSize - (offset - bias); 1640 if (diff <= 0) 1641 break; 1642 n = min(n, diff); 1643 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1644 if (error) 1645 break; 1646 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1647 if (error) { 1648 brelse(bp); 1649 return (error); 1650 } 1651 n = min(n, blsize - bp->b_resid); 1652 if (n == 0) { 1653 brelse(bp); 1654 return (EIO); 1655 } 1656 1657 /* 1658 * Convert from dos directory entries to fs-independent 1659 * directory entries. 1660 */ 1661 for (dentp = (struct direntry *)(bp->b_data + on); 1662 (char *)dentp < bp->b_data + on + n; 1663 dentp++, offset += sizeof(struct direntry)) { 1664 #if 0 1665 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1666 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1667 #endif 1668 /* 1669 * If this is an unused entry, we can stop. 1670 */ 1671 if (dentp->deName[0] == SLOT_EMPTY) { 1672 brelse(bp); 1673 goto out; 1674 } 1675 /* 1676 * Skip deleted entries. 1677 */ 1678 if (dentp->deName[0] == SLOT_DELETED) { 1679 chksum = -1; 1680 mbnambuf_init(&nb); 1681 continue; 1682 } 1683 1684 /* 1685 * Handle Win95 long directory entries 1686 */ 1687 if (dentp->deAttributes == ATTR_WIN95) { 1688 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1689 continue; 1690 chksum = win2unixfn(&nb, 1691 (struct winentry *)dentp, chksum, pmp); 1692 continue; 1693 } 1694 1695 /* 1696 * Skip volume labels 1697 */ 1698 if (dentp->deAttributes & ATTR_VOLUME) { 1699 chksum = -1; 1700 mbnambuf_init(&nb); 1701 continue; 1702 } 1703 /* 1704 * This computation of d_fileno must match 1705 * the computation of va_fileid in 1706 * msdosfs_getattr. 1707 */ 1708 if (dentp->deAttributes & ATTR_DIRECTORY) { 1709 fileno = getushort(dentp->deStartCluster); 1710 if (FAT32(pmp)) 1711 fileno |= getushort(dentp->deHighClust) << 16; 1712 /* if this is the root directory */ 1713 if (fileno == MSDOSFSROOT) 1714 if (FAT32(pmp)) 1715 fileno = (uint64_t)cntobn(pmp, 1716 pmp->pm_rootdirblk) 1717 * dirsperblk; 1718 else 1719 fileno = 1; 1720 else 1721 fileno = (uint64_t)cntobn(pmp, fileno) * 1722 dirsperblk; 1723 dirbuf.d_type = DT_DIR; 1724 } else { 1725 fileno = (uoff_t)offset / 1726 sizeof(struct direntry); 1727 dirbuf.d_type = DT_REG; 1728 } 1729 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1730 dirbuf.d_fileno = 1731 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1732 } else 1733 dirbuf.d_fileno = (uint32_t)fileno; 1734 1735 if (chksum != winChksum(dentp)) { 1736 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1737 (u_char *)dirbuf.d_name, 1738 dentp->deLowerCase | 1739 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1740 (LCASE_BASE | LCASE_EXT) : 0), 1741 pmp); 1742 mbnambuf_init(&nb); 1743 } else 1744 mbnambuf_flush(&nb, &dirbuf); 1745 chksum = -1; 1746 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1747 if (uio->uio_resid < dirbuf.d_reclen) { 1748 brelse(bp); 1749 goto out; 1750 } 1751 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1752 if (error) { 1753 brelse(bp); 1754 goto out; 1755 } 1756 if (cookies) { 1757 *cookies++ = offset + sizeof(struct direntry); 1758 if (--ncookies <= 0) { 1759 brelse(bp); 1760 goto out; 1761 } 1762 } 1763 off = offset + sizeof(struct direntry); 1764 } 1765 brelse(bp); 1766 } 1767 out: 1768 /* Subtract unused cookies */ 1769 if (ap->a_ncookies) 1770 *ap->a_ncookies -= ncookies; 1771 1772 uio->uio_offset = off; 1773 1774 /* 1775 * Set the eofflag (NFS uses it) 1776 */ 1777 if (ap->a_eofflag) { 1778 if (dep->de_FileSize - (offset - bias) <= 0) 1779 *ap->a_eofflag = 1; 1780 else 1781 *ap->a_eofflag = 0; 1782 } 1783 return (error); 1784 } 1785 1786 /*- 1787 * a_vp - pointer to the file's vnode 1788 * a_bn - logical block number within the file (cluster number for us) 1789 * a_bop - where to return the bufobj of the special file containing the fs 1790 * a_bnp - where to return the "physical" block number corresponding to a_bn 1791 * (relative to the special file; units are blocks of size DEV_BSIZE) 1792 * a_runp - where to return the "run past" a_bn. This is the count of logical 1793 * blocks whose physical blocks (together with a_bn's physical block) 1794 * are contiguous. 1795 * a_runb - where to return the "run before" a_bn. 1796 */ 1797 static int 1798 msdosfs_bmap(ap) 1799 struct vop_bmap_args /* { 1800 struct vnode *a_vp; 1801 daddr_t a_bn; 1802 struct bufobj **a_bop; 1803 daddr_t *a_bnp; 1804 int *a_runp; 1805 int *a_runb; 1806 } */ *ap; 1807 { 1808 struct denode *dep; 1809 struct mount *mp; 1810 struct msdosfsmount *pmp; 1811 struct vnode *vp; 1812 daddr_t runbn; 1813 u_long cn; 1814 int bnpercn, error, maxio, maxrun, run; 1815 1816 vp = ap->a_vp; 1817 dep = VTODE(vp); 1818 pmp = dep->de_pmp; 1819 if (ap->a_bop != NULL) 1820 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1821 if (ap->a_bnp == NULL) 1822 return (0); 1823 if (ap->a_runp != NULL) 1824 *ap->a_runp = 0; 1825 if (ap->a_runb != NULL) 1826 *ap->a_runb = 0; 1827 cn = ap->a_bn; 1828 if (cn != ap->a_bn) 1829 return (EFBIG); 1830 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1831 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1832 return (error); 1833 1834 mp = vp->v_mount; 1835 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1836 bnpercn = de_cn2bn(pmp, 1); 1837 if (ap->a_runp != NULL) { 1838 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1839 for (run = 1; run <= maxrun; run++) { 1840 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1841 runbn != *ap->a_bnp + run * bnpercn) 1842 break; 1843 } 1844 *ap->a_runp = run - 1; 1845 } 1846 if (ap->a_runb != NULL) { 1847 maxrun = ulmin(maxio - 1, cn); 1848 for (run = 1; run < maxrun; run++) { 1849 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1850 runbn != *ap->a_bnp - run * bnpercn) 1851 break; 1852 } 1853 *ap->a_runb = run - 1; 1854 } 1855 return (0); 1856 } 1857 1858 static int 1859 msdosfs_strategy(ap) 1860 struct vop_strategy_args /* { 1861 struct vnode *a_vp; 1862 struct buf *a_bp; 1863 } */ *ap; 1864 { 1865 struct buf *bp = ap->a_bp; 1866 struct denode *dep = VTODE(ap->a_vp); 1867 struct bufobj *bo; 1868 int error = 0; 1869 daddr_t blkno; 1870 1871 /* 1872 * If we don't already know the filesystem relative block number 1873 * then get it using pcbmap(). If pcbmap() returns the block 1874 * number as -1 then we've got a hole in the file. DOS filesystems 1875 * don't allow files with holes, so we shouldn't ever see this. 1876 */ 1877 if (bp->b_blkno == bp->b_lblkno) { 1878 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1879 bp->b_blkno = blkno; 1880 if (error) { 1881 bp->b_error = error; 1882 bp->b_ioflags |= BIO_ERROR; 1883 bufdone(bp); 1884 return (error); 1885 } 1886 if ((long)bp->b_blkno == -1) 1887 vfs_bio_clrbuf(bp); 1888 } 1889 if (bp->b_blkno == -1) { 1890 bufdone(bp); 1891 return (0); 1892 } 1893 /* 1894 * Read/write the block from/to the disk that contains the desired 1895 * file block. 1896 */ 1897 bp->b_iooffset = dbtob(bp->b_blkno); 1898 bo = dep->de_pmp->pm_bo; 1899 BO_STRATEGY(bo, bp); 1900 return (0); 1901 } 1902 1903 static int 1904 msdosfs_print(ap) 1905 struct vop_print_args /* { 1906 struct vnode *vp; 1907 } */ *ap; 1908 { 1909 struct denode *dep = VTODE(ap->a_vp); 1910 1911 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1912 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1913 printf("on dev %s\n", devtoname(dep->de_dev)); 1914 return (0); 1915 } 1916 1917 static int 1918 msdosfs_pathconf(ap) 1919 struct vop_pathconf_args /* { 1920 struct vnode *a_vp; 1921 int a_name; 1922 int *a_retval; 1923 } */ *ap; 1924 { 1925 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1926 1927 switch (ap->a_name) { 1928 case _PC_LINK_MAX: 1929 *ap->a_retval = 1; 1930 return (0); 1931 case _PC_NAME_MAX: 1932 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1933 return (0); 1934 case _PC_PATH_MAX: 1935 *ap->a_retval = PATH_MAX; 1936 return (0); 1937 case _PC_CHOWN_RESTRICTED: 1938 *ap->a_retval = 1; 1939 return (0); 1940 case _PC_NO_TRUNC: 1941 *ap->a_retval = 0; 1942 return (0); 1943 default: 1944 return (EINVAL); 1945 } 1946 /* NOTREACHED */ 1947 } 1948 1949 static int 1950 msdosfs_advlock(ap) 1951 struct vop_advlock_args /* { 1952 struct vnode *a_vp; 1953 u_char a_id; 1954 int a_op; 1955 struct flock *a_fl; 1956 int a_flags; 1957 } */ *ap; 1958 { 1959 struct denode *dep = VTODE(ap->a_vp); 1960 1961 return (lf_advlock(ap, &dep->de_lockf, dep->de_FileSize)); 1962 } 1963 1964 static int 1965 msdosfs_vptofh(ap) 1966 struct vop_vptofh_args /* { 1967 struct vnode *a_vp; 1968 struct fid *a_fhp; 1969 } */ *ap; 1970 { 1971 struct denode *dep; 1972 struct defid *defhp; 1973 1974 dep = VTODE(ap->a_vp); 1975 defhp = (struct defid *)ap->a_fhp; 1976 defhp->defid_len = sizeof(struct defid); 1977 defhp->defid_dirclust = dep->de_dirclust; 1978 defhp->defid_dirofs = dep->de_diroffset; 1979 /* defhp->defid_gen = dep->de_gen; */ 1980 return (0); 1981 } 1982 1983 /* Global vfs data structures for msdosfs */ 1984 struct vop_vector msdosfs_vnodeops = { 1985 .vop_default = &default_vnodeops, 1986 1987 .vop_access = msdosfs_access, 1988 .vop_advlock = msdosfs_advlock, 1989 .vop_bmap = msdosfs_bmap, 1990 .vop_cachedlookup = msdosfs_lookup, 1991 .vop_open = msdosfs_open, 1992 .vop_close = msdosfs_close, 1993 .vop_create = msdosfs_create, 1994 .vop_fsync = msdosfs_fsync, 1995 .vop_getattr = msdosfs_getattr, 1996 .vop_inactive = msdosfs_inactive, 1997 .vop_link = msdosfs_link, 1998 .vop_lookup = vfs_cache_lookup, 1999 .vop_mkdir = msdosfs_mkdir, 2000 .vop_mknod = msdosfs_mknod, 2001 .vop_pathconf = msdosfs_pathconf, 2002 .vop_print = msdosfs_print, 2003 .vop_read = msdosfs_read, 2004 .vop_readdir = msdosfs_readdir, 2005 .vop_reclaim = msdosfs_reclaim, 2006 .vop_remove = msdosfs_remove, 2007 .vop_rename = msdosfs_rename, 2008 .vop_rmdir = msdosfs_rmdir, 2009 .vop_setattr = msdosfs_setattr, 2010 .vop_strategy = msdosfs_strategy, 2011 .vop_symlink = msdosfs_symlink, 2012 .vop_write = msdosfs_write, 2013 .vop_vptofh = msdosfs_vptofh, 2014 };
Cache object: 27f538985eec1bba436c3e59bd464555
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