1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 3 4 /*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /*- 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/bio.h> 54 #include <sys/buf.h> 55 #include <sys/clock.h> 56 #include <sys/dirent.h> 57 #include <sys/lock.h> 58 #include <sys/lockf.h> 59 #include <sys/malloc.h> 60 #include <sys/mount.h> 61 #include <sys/mutex.h> 62 #include <sys/namei.h> 63 #include <sys/priv.h> 64 #include <sys/stat.h> 65 #include <sys/unistd.h> 66 #include <sys/vnode.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_extern.h> 70 71 #include <fs/msdosfs/bpb.h> 72 #include <fs/msdosfs/direntry.h> 73 #include <fs/msdosfs/denode.h> 74 #include <fs/msdosfs/fat.h> 75 #include <fs/msdosfs/msdosfsmount.h> 76 77 #define DOS_FILESIZE_MAX 0xffffffff 78 79 /* 80 * Prototypes for MSDOSFS vnode operations 81 */ 82 static vop_create_t msdosfs_create; 83 static vop_mknod_t msdosfs_mknod; 84 static vop_open_t msdosfs_open; 85 static vop_close_t msdosfs_close; 86 static vop_access_t msdosfs_access; 87 static vop_getattr_t msdosfs_getattr; 88 static vop_setattr_t msdosfs_setattr; 89 static vop_read_t msdosfs_read; 90 static vop_write_t msdosfs_write; 91 static vop_fsync_t msdosfs_fsync; 92 static vop_remove_t msdosfs_remove; 93 static vop_link_t msdosfs_link; 94 static vop_rename_t msdosfs_rename; 95 static vop_mkdir_t msdosfs_mkdir; 96 static vop_rmdir_t msdosfs_rmdir; 97 static vop_symlink_t msdosfs_symlink; 98 static vop_readdir_t msdosfs_readdir; 99 static vop_bmap_t msdosfs_bmap; 100 static vop_strategy_t msdosfs_strategy; 101 static vop_print_t msdosfs_print; 102 static vop_pathconf_t msdosfs_pathconf; 103 static vop_vptofh_t msdosfs_vptofh; 104 105 /* 106 * Some general notes: 107 * 108 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 109 * read/written using the vnode for the filesystem. Blocks that represent 110 * the contents of a file are read/written using the vnode for the file 111 * (including directories when they are read/written as files). This 112 * presents problems for the dos filesystem because data that should be in 113 * an inode (if dos had them) resides in the directory itself. Since we 114 * must update directory entries without the benefit of having the vnode 115 * for the directory we must use the vnode for the filesystem. This means 116 * that when a directory is actually read/written (via read, write, or 117 * readdir, or seek) we must use the vnode for the filesystem instead of 118 * the vnode for the directory as would happen in ufs. This is to insure we 119 * retreive the correct block from the buffer cache since the hash value is 120 * based upon the vnode address and the desired block number. 121 */ 122 123 /* 124 * Create a regular file. On entry the directory to contain the file being 125 * created is locked. We must release before we return. We must also free 126 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 127 * only if the SAVESTART bit in cn_flags is clear on success. 128 */ 129 static int 130 msdosfs_create(ap) 131 struct vop_create_args /* { 132 struct vnode *a_dvp; 133 struct vnode **a_vpp; 134 struct componentname *a_cnp; 135 struct vattr *a_vap; 136 } */ *ap; 137 { 138 struct componentname *cnp = ap->a_cnp; 139 struct denode ndirent; 140 struct denode *dep; 141 struct denode *pdep = VTODE(ap->a_dvp); 142 struct timespec ts; 143 int error; 144 145 #ifdef MSDOSFS_DEBUG 146 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 147 #endif 148 149 /* 150 * If this is the root directory and there is no space left we 151 * can't do anything. This is because the root directory can not 152 * change size. 153 */ 154 if (pdep->de_StartCluster == MSDOSFSROOT 155 && pdep->de_fndoffset >= pdep->de_FileSize) { 156 error = ENOSPC; 157 goto bad; 158 } 159 160 /* 161 * Create a directory entry for the file, then call createde() to 162 * have it installed. NOTE: DOS files are always executable. We 163 * use the absence of the owner write bit to make the file 164 * readonly. 165 */ 166 #ifdef DIAGNOSTIC 167 if ((cnp->cn_flags & HASBUF) == 0) 168 panic("msdosfs_create: no name"); 169 #endif 170 bzero(&ndirent, sizeof(ndirent)); 171 error = uniqdosname(pdep, cnp, ndirent.de_Name); 172 if (error) 173 goto bad; 174 175 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 176 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 177 ndirent.de_LowerCase = 0; 178 ndirent.de_StartCluster = 0; 179 ndirent.de_FileSize = 0; 180 ndirent.de_pmp = pdep->de_pmp; 181 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 182 getnanotime(&ts); 183 DETIMES(&ndirent, &ts, &ts, &ts); 184 error = createde(&ndirent, pdep, &dep, cnp); 185 if (error) 186 goto bad; 187 *ap->a_vpp = DETOV(dep); 188 return (0); 189 190 bad: 191 return (error); 192 } 193 194 static int 195 msdosfs_mknod(ap) 196 struct vop_mknod_args /* { 197 struct vnode *a_dvp; 198 struct vnode **a_vpp; 199 struct componentname *a_cnp; 200 struct vattr *a_vap; 201 } */ *ap; 202 { 203 204 return (EINVAL); 205 } 206 207 static int 208 msdosfs_open(ap) 209 struct vop_open_args /* { 210 struct vnode *a_vp; 211 int a_mode; 212 struct ucred *a_cred; 213 struct thread *a_td; 214 struct file *a_fp; 215 } */ *ap; 216 { 217 struct denode *dep = VTODE(ap->a_vp); 218 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 219 return 0; 220 } 221 222 static int 223 msdosfs_close(ap) 224 struct vop_close_args /* { 225 struct vnode *a_vp; 226 int a_fflag; 227 struct ucred *a_cred; 228 struct thread *a_td; 229 } */ *ap; 230 { 231 struct vnode *vp = ap->a_vp; 232 struct denode *dep = VTODE(vp); 233 struct timespec ts; 234 235 VI_LOCK(vp); 236 if (vp->v_usecount > 1) { 237 getnanotime(&ts); 238 DETIMES(dep, &ts, &ts, &ts); 239 } 240 VI_UNLOCK(vp); 241 return 0; 242 } 243 244 static int 245 msdosfs_access(ap) 246 struct vop_access_args /* { 247 struct vnode *a_vp; 248 accmode_t a_accmode; 249 struct ucred *a_cred; 250 struct thread *a_td; 251 } */ *ap; 252 { 253 struct vnode *vp = ap->a_vp; 254 struct denode *dep = VTODE(ap->a_vp); 255 struct msdosfsmount *pmp = dep->de_pmp; 256 mode_t file_mode; 257 accmode_t accmode = ap->a_accmode; 258 259 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 260 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 261 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 262 263 /* 264 * Disallow writing to directories and regular files if the 265 * filesystem is read-only. 266 */ 267 if (accmode & VWRITE) { 268 switch (vp->v_type) { 269 case VDIR: 270 case VREG: 271 if (vp->v_mount->mnt_flag & MNT_RDONLY) 272 return (EROFS); 273 break; 274 default: 275 break; 276 } 277 } 278 279 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 280 ap->a_accmode, ap->a_cred, NULL)); 281 } 282 283 static int 284 msdosfs_getattr(ap) 285 struct vop_getattr_args /* { 286 struct vnode *a_vp; 287 struct vattr *a_vap; 288 struct ucred *a_cred; 289 } */ *ap; 290 { 291 struct denode *dep = VTODE(ap->a_vp); 292 struct msdosfsmount *pmp = dep->de_pmp; 293 struct vattr *vap = ap->a_vap; 294 mode_t mode; 295 struct timespec ts; 296 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 297 uint64_t fileid; 298 299 getnanotime(&ts); 300 DETIMES(dep, &ts, &ts, &ts); 301 vap->va_fsid = dev2udev(pmp->pm_dev); 302 /* 303 * The following computation of the fileid must be the same as that 304 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 305 * doesn't work. 306 */ 307 if (dep->de_Attributes & ATTR_DIRECTORY) { 308 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 309 dirsperblk; 310 if (dep->de_StartCluster == MSDOSFSROOT) 311 fileid = 1; 312 } else { 313 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 314 dirsperblk; 315 if (dep->de_dirclust == MSDOSFSROOT) 316 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 317 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 318 } 319 320 if (pmp->pm_flags & MSDOSFS_LARGEFS) 321 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 322 else 323 vap->va_fileid = (long)fileid; 324 325 if ((dep->de_Attributes & ATTR_READONLY) == 0) 326 mode = S_IRWXU|S_IRWXG|S_IRWXO; 327 else 328 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 329 vap->va_mode = mode & 330 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 331 vap->va_uid = pmp->pm_uid; 332 vap->va_gid = pmp->pm_gid; 333 vap->va_nlink = 1; 334 vap->va_rdev = NODEV; 335 vap->va_size = dep->de_FileSize; 336 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 337 vap->va_ctime = vap->va_mtime; 338 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 339 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 340 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 341 0, &vap->va_birthtime); 342 } else { 343 vap->va_atime = vap->va_mtime; 344 vap->va_birthtime.tv_sec = -1; 345 vap->va_birthtime.tv_nsec = 0; 346 } 347 vap->va_flags = 0; 348 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 349 vap->va_flags |= SF_ARCHIVED; 350 vap->va_gen = 0; 351 vap->va_blocksize = pmp->pm_bpcluster; 352 vap->va_bytes = 353 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 354 vap->va_type = ap->a_vp->v_type; 355 vap->va_filerev = dep->de_modrev; 356 return (0); 357 } 358 359 static int 360 msdosfs_setattr(ap) 361 struct vop_setattr_args /* { 362 struct vnode *a_vp; 363 struct vattr *a_vap; 364 struct ucred *a_cred; 365 } */ *ap; 366 { 367 struct vnode *vp = ap->a_vp; 368 struct denode *dep = VTODE(ap->a_vp); 369 struct msdosfsmount *pmp = dep->de_pmp; 370 struct vattr *vap = ap->a_vap; 371 struct ucred *cred = ap->a_cred; 372 struct thread *td = curthread; 373 int error = 0; 374 375 #ifdef MSDOSFS_DEBUG 376 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 377 ap->a_vp, vap, cred); 378 #endif 379 380 /* 381 * Check for unsettable attributes. 382 */ 383 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 384 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 385 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 386 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 387 #ifdef MSDOSFS_DEBUG 388 printf("msdosfs_setattr(): returning EINVAL\n"); 389 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 390 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 391 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 392 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 393 printf(" va_uid %x, va_gid %x\n", 394 vap->va_uid, vap->va_gid); 395 #endif 396 return (EINVAL); 397 } 398 if (vap->va_flags != VNOVAL) { 399 if (vp->v_mount->mnt_flag & MNT_RDONLY) 400 return (EROFS); 401 if (cred->cr_uid != pmp->pm_uid) { 402 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 403 if (error) 404 return (error); 405 } 406 /* 407 * We are very inconsistent about handling unsupported 408 * attributes. We ignored the access time and the 409 * read and execute bits. We were strict for the other 410 * attributes. 411 * 412 * Here we are strict, stricter than ufs in not allowing 413 * users to attempt to set SF_SETTABLE bits or anyone to 414 * set unsupported bits. However, we ignore attempts to 415 * set ATTR_ARCHIVE for directories `cp -pr' from a more 416 * sensible filesystem attempts it a lot. 417 */ 418 if (vap->va_flags & SF_SETTABLE) { 419 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0); 420 if (error) 421 return (error); 422 } 423 if (vap->va_flags & ~SF_ARCHIVED) 424 return EOPNOTSUPP; 425 if (vap->va_flags & SF_ARCHIVED) 426 dep->de_Attributes &= ~ATTR_ARCHIVE; 427 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 428 dep->de_Attributes |= ATTR_ARCHIVE; 429 dep->de_flag |= DE_MODIFIED; 430 } 431 432 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 433 uid_t uid; 434 gid_t gid; 435 436 if (vp->v_mount->mnt_flag & MNT_RDONLY) 437 return (EROFS); 438 uid = vap->va_uid; 439 if (uid == (uid_t)VNOVAL) 440 uid = pmp->pm_uid; 441 gid = vap->va_gid; 442 if (gid == (gid_t)VNOVAL) 443 gid = pmp->pm_gid; 444 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 445 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 446 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 447 if (error) 448 return (error); 449 } 450 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 451 return EINVAL; 452 } 453 454 if (vap->va_size != VNOVAL) { 455 switch (vp->v_type) { 456 case VDIR: 457 return (EISDIR); 458 case VREG: 459 /* 460 * Truncation is only supported for regular files, 461 * Disallow it if the filesystem is read-only. 462 */ 463 if (vp->v_mount->mnt_flag & MNT_RDONLY) 464 return (EROFS); 465 break; 466 default: 467 /* 468 * According to POSIX, the result is unspecified 469 * for file types other than regular files, 470 * directories and shared memory objects. We 471 * don't support any file types except regular 472 * files and directories in this file system, so 473 * this (default) case is unreachable and can do 474 * anything. Keep falling through to detrunc() 475 * for now. 476 */ 477 break; 478 } 479 error = detrunc(dep, vap->va_size, 0, cred); 480 if (error) 481 return error; 482 } 483 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 484 if (vp->v_mount->mnt_flag & MNT_RDONLY) 485 return (EROFS); 486 if (vap->va_vaflags & VA_UTIMES_NULL) { 487 error = VOP_ACCESS(vp, VADMIN, cred, td); 488 if (error) 489 error = VOP_ACCESS(vp, VWRITE, cred, td); 490 } else 491 error = VOP_ACCESS(vp, VADMIN, cred, td); 492 if (vp->v_type != VDIR) { 493 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 494 vap->va_atime.tv_sec != VNOVAL) { 495 dep->de_flag &= ~DE_ACCESS; 496 timespec2fattime(&vap->va_atime, 0, 497 &dep->de_ADate, NULL, NULL); 498 } 499 if (vap->va_mtime.tv_sec != VNOVAL) { 500 dep->de_flag &= ~DE_UPDATE; 501 timespec2fattime(&vap->va_mtime, 0, 502 &dep->de_MDate, &dep->de_MTime, NULL); 503 } 504 dep->de_Attributes |= ATTR_ARCHIVE; 505 dep->de_flag |= DE_MODIFIED; 506 } 507 } 508 /* 509 * DOS files only have the ability to have their writability 510 * attribute set, so we use the owner write bit to set the readonly 511 * attribute. 512 */ 513 if (vap->va_mode != (mode_t)VNOVAL) { 514 if (vp->v_mount->mnt_flag & MNT_RDONLY) 515 return (EROFS); 516 if (cred->cr_uid != pmp->pm_uid) { 517 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 518 if (error) 519 return (error); 520 } 521 if (vp->v_type != VDIR) { 522 /* We ignore the read and execute bits. */ 523 if (vap->va_mode & VWRITE) 524 dep->de_Attributes &= ~ATTR_READONLY; 525 else 526 dep->de_Attributes |= ATTR_READONLY; 527 dep->de_Attributes |= ATTR_ARCHIVE; 528 dep->de_flag |= DE_MODIFIED; 529 } 530 } 531 return (deupdat(dep, 0)); 532 } 533 534 static int 535 msdosfs_read(ap) 536 struct vop_read_args /* { 537 struct vnode *a_vp; 538 struct uio *a_uio; 539 int a_ioflag; 540 struct ucred *a_cred; 541 } */ *ap; 542 { 543 int error = 0; 544 int blsize; 545 int isadir; 546 ssize_t orig_resid; 547 u_int n; 548 u_long diff; 549 u_long on; 550 daddr_t lbn; 551 daddr_t rablock; 552 int rasize; 553 int seqcount; 554 struct buf *bp; 555 struct vnode *vp = ap->a_vp; 556 struct denode *dep = VTODE(vp); 557 struct msdosfsmount *pmp = dep->de_pmp; 558 struct uio *uio = ap->a_uio; 559 560 /* 561 * If they didn't ask for any data, then we are done. 562 */ 563 orig_resid = uio->uio_resid; 564 if (orig_resid == 0) 565 return (0); 566 567 /* 568 * The caller is supposed to ensure that 569 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 570 * We don't need to check for large offsets as in ffs because 571 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large 572 * offsets cannot cause overflow even in theory. 573 */ 574 575 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 576 577 isadir = dep->de_Attributes & ATTR_DIRECTORY; 578 do { 579 if (uio->uio_offset >= dep->de_FileSize) 580 break; 581 lbn = de_cluster(pmp, uio->uio_offset); 582 rablock = lbn + 1; 583 blsize = pmp->pm_bpcluster; 584 on = uio->uio_offset & pmp->pm_crbomask; 585 /* 586 * If we are operating on a directory file then be sure to 587 * do i/o with the vnode for the filesystem instead of the 588 * vnode for the directory. 589 */ 590 if (isadir) { 591 /* convert cluster # to block # */ 592 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 593 if (error == E2BIG) { 594 error = EINVAL; 595 break; 596 } else if (error) 597 break; 598 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 599 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 600 error = bread(vp, lbn, blsize, NOCRED, &bp); 601 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 602 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 603 NOCRED, on + uio->uio_resid, seqcount, 0, &bp); 604 } else if (seqcount > 1) { 605 rasize = blsize; 606 error = breadn(vp, lbn, 607 blsize, &rablock, &rasize, 1, NOCRED, &bp); 608 } else { 609 error = bread(vp, lbn, blsize, NOCRED, &bp); 610 } 611 if (error) { 612 brelse(bp); 613 break; 614 } 615 diff = pmp->pm_bpcluster - on; 616 n = diff > uio->uio_resid ? uio->uio_resid : diff; 617 diff = dep->de_FileSize - uio->uio_offset; 618 if (diff < n) 619 n = diff; 620 diff = blsize - bp->b_resid; 621 if (diff < n) 622 n = diff; 623 error = uiomove(bp->b_data + on, (int) n, uio); 624 brelse(bp); 625 } while (error == 0 && uio->uio_resid > 0 && n != 0); 626 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 627 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 628 dep->de_flag |= DE_ACCESS; 629 return (error); 630 } 631 632 /* 633 * Write data to a file or directory. 634 */ 635 static int 636 msdosfs_write(ap) 637 struct vop_write_args /* { 638 struct vnode *a_vp; 639 struct uio *a_uio; 640 int a_ioflag; 641 struct ucred *a_cred; 642 } */ *ap; 643 { 644 int n; 645 int croffset; 646 ssize_t resid; 647 u_long osize; 648 int error = 0; 649 u_long count; 650 int seqcount; 651 daddr_t bn, lastcn; 652 struct buf *bp; 653 int ioflag = ap->a_ioflag; 654 struct uio *uio = ap->a_uio; 655 struct vnode *vp = ap->a_vp; 656 struct vnode *thisvp; 657 struct denode *dep = VTODE(vp); 658 struct msdosfsmount *pmp = dep->de_pmp; 659 struct ucred *cred = ap->a_cred; 660 661 #ifdef MSDOSFS_DEBUG 662 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 663 vp, uio, ioflag, cred); 664 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 665 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 666 #endif 667 668 switch (vp->v_type) { 669 case VREG: 670 if (ioflag & IO_APPEND) 671 uio->uio_offset = dep->de_FileSize; 672 thisvp = vp; 673 break; 674 case VDIR: 675 return EISDIR; 676 default: 677 panic("msdosfs_write(): bad file type"); 678 } 679 680 /* 681 * This is needed (unlike in ffs_write()) because we extend the 682 * file outside of the loop but we don't want to extend the file 683 * for writes of 0 bytes. 684 */ 685 if (uio->uio_resid == 0) 686 return (0); 687 688 /* 689 * The caller is supposed to ensure that 690 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 691 */ 692 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 693 return (EFBIG); 694 695 /* 696 * If they've exceeded their filesize limit, tell them about it. 697 */ 698 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 699 return (EFBIG); 700 701 /* 702 * If the offset we are starting the write at is beyond the end of 703 * the file, then they've done a seek. Unix filesystems allow 704 * files with holes in them, DOS doesn't so we must fill the hole 705 * with zeroed blocks. 706 */ 707 if (uio->uio_offset > dep->de_FileSize) { 708 error = deextend(dep, uio->uio_offset, cred); 709 if (error) 710 return (error); 711 } 712 713 /* 714 * Remember some values in case the write fails. 715 */ 716 resid = uio->uio_resid; 717 osize = dep->de_FileSize; 718 719 /* 720 * If we write beyond the end of the file, extend it to its ultimate 721 * size ahead of the time to hopefully get a contiguous area. 722 */ 723 if (uio->uio_offset + resid > osize) { 724 count = de_clcount(pmp, uio->uio_offset + resid) - 725 de_clcount(pmp, osize); 726 error = extendfile(dep, count, NULL, NULL, 0); 727 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 728 goto errexit; 729 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 730 } else 731 lastcn = de_clcount(pmp, osize) - 1; 732 733 seqcount = ioflag >> IO_SEQSHIFT; 734 do { 735 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 736 error = ENOSPC; 737 break; 738 } 739 740 croffset = uio->uio_offset & pmp->pm_crbomask; 741 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 742 if (uio->uio_offset + n > dep->de_FileSize) { 743 dep->de_FileSize = uio->uio_offset + n; 744 /* The object size needs to be set before buffer is allocated */ 745 vnode_pager_setsize(vp, dep->de_FileSize); 746 } 747 748 bn = de_cluster(pmp, uio->uio_offset); 749 if ((uio->uio_offset & pmp->pm_crbomask) == 0 750 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 751 > de_cluster(pmp, uio->uio_offset) 752 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 753 /* 754 * If either the whole cluster gets written, 755 * or we write the cluster from its start beyond EOF, 756 * then no need to read data from disk. 757 */ 758 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 759 vfs_bio_clrbuf(bp); 760 /* 761 * Do the bmap now, since pcbmap needs buffers 762 * for the fat table. (see msdosfs_strategy) 763 */ 764 if (bp->b_blkno == bp->b_lblkno) { 765 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 766 if (error) 767 bp->b_blkno = -1; 768 else 769 bp->b_blkno = bn; 770 } 771 if (bp->b_blkno == -1) { 772 brelse(bp); 773 if (!error) 774 error = EIO; /* XXX */ 775 break; 776 } 777 } else { 778 /* 779 * The block we need to write into exists, so read it in. 780 */ 781 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 782 if (error) { 783 brelse(bp); 784 break; 785 } 786 } 787 788 /* 789 * Should these vnode_pager_* functions be done on dir 790 * files? 791 */ 792 793 /* 794 * Copy the data from user space into the buf header. 795 */ 796 error = uiomove(bp->b_data + croffset, n, uio); 797 if (error) { 798 brelse(bp); 799 break; 800 } 801 802 /* Prepare for clustered writes in some else clauses. */ 803 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 804 bp->b_flags |= B_CLUSTEROK; 805 806 /* 807 * If IO_SYNC, then each buffer is written synchronously. 808 * Otherwise, if we have a severe page deficiency then 809 * write the buffer asynchronously. Otherwise, if on a 810 * cluster boundary then write the buffer asynchronously, 811 * combining it with contiguous clusters if permitted and 812 * possible, since we don't expect more writes into this 813 * buffer soon. Otherwise, do a delayed write because we 814 * expect more writes into this buffer soon. 815 */ 816 if (ioflag & IO_SYNC) 817 (void)bwrite(bp); 818 else if (vm_page_count_severe() || buf_dirty_count_severe()) 819 bawrite(bp); 820 else if (n + croffset == pmp->pm_bpcluster) { 821 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 822 cluster_write(vp, bp, dep->de_FileSize, 823 seqcount, 0); 824 else 825 bawrite(bp); 826 } else 827 bdwrite(bp); 828 dep->de_flag |= DE_UPDATE; 829 } while (error == 0 && uio->uio_resid > 0); 830 831 /* 832 * If the write failed and they want us to, truncate the file back 833 * to the size it was before the write was attempted. 834 */ 835 errexit: 836 if (error) { 837 if (ioflag & IO_UNIT) { 838 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 839 uio->uio_offset -= resid - uio->uio_resid; 840 uio->uio_resid = resid; 841 } else { 842 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 843 if (uio->uio_resid != resid) 844 error = 0; 845 } 846 } else if (ioflag & IO_SYNC) 847 error = deupdat(dep, 1); 848 return (error); 849 } 850 851 /* 852 * Flush the blocks of a file to disk. 853 */ 854 static int 855 msdosfs_fsync(ap) 856 struct vop_fsync_args /* { 857 struct vnode *a_vp; 858 struct ucred *a_cred; 859 int a_waitfor; 860 struct thread *a_td; 861 } */ *ap; 862 { 863 struct vnode *devvp; 864 int allerror, error; 865 866 vop_stdfsync(ap); 867 868 /* 869 * If the syncing request comes from fsync(2), sync the entire 870 * FAT and any other metadata that happens to be on devvp. We 871 * need this mainly for the FAT. We write the FAT sloppily, and 872 * syncing it all now is the best we can easily do to get all 873 * directory entries associated with the file (not just the file) 874 * fully synced. The other metadata includes critical metadata 875 * for all directory entries, but only in the MNT_ASYNC case. We 876 * will soon sync all metadata in the file's directory entry. 877 * Non-critical metadata for associated directory entries only 878 * gets synced accidentally, as in most file systems. 879 */ 880 if (ap->a_waitfor == MNT_WAIT) { 881 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 882 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 883 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 884 VOP_UNLOCK(devvp, 0); 885 } else 886 allerror = 0; 887 888 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT); 889 if (allerror == 0) 890 allerror = error; 891 return (allerror); 892 } 893 894 static int 895 msdosfs_remove(ap) 896 struct vop_remove_args /* { 897 struct vnode *a_dvp; 898 struct vnode *a_vp; 899 struct componentname *a_cnp; 900 } */ *ap; 901 { 902 struct denode *dep = VTODE(ap->a_vp); 903 struct denode *ddep = VTODE(ap->a_dvp); 904 int error; 905 906 if (ap->a_vp->v_type == VDIR) 907 error = EPERM; 908 else 909 error = removede(ddep, dep); 910 #ifdef MSDOSFS_DEBUG 911 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 912 #endif 913 return (error); 914 } 915 916 /* 917 * DOS filesystems don't know what links are. 918 */ 919 static int 920 msdosfs_link(ap) 921 struct vop_link_args /* { 922 struct vnode *a_tdvp; 923 struct vnode *a_vp; 924 struct componentname *a_cnp; 925 } */ *ap; 926 { 927 return (EOPNOTSUPP); 928 } 929 930 /* 931 * Renames on files require moving the denode to a new hash queue since the 932 * denode's location is used to compute which hash queue to put the file 933 * in. Unless it is a rename in place. For example "mv a b". 934 * 935 * What follows is the basic algorithm: 936 * 937 * if (file move) { 938 * if (dest file exists) { 939 * remove dest file 940 * } 941 * if (dest and src in same directory) { 942 * rewrite name in existing directory slot 943 * } else { 944 * write new entry in dest directory 945 * update offset and dirclust in denode 946 * move denode to new hash chain 947 * clear old directory entry 948 * } 949 * } else { 950 * directory move 951 * if (dest directory exists) { 952 * if (dest is not empty) { 953 * return ENOTEMPTY 954 * } 955 * remove dest directory 956 * } 957 * if (dest and src in same directory) { 958 * rewrite name in existing entry 959 * } else { 960 * be sure dest is not a child of src directory 961 * write entry in dest directory 962 * update "." and ".." in moved directory 963 * clear old directory entry for moved directory 964 * } 965 * } 966 * 967 * On entry: 968 * source's parent directory is unlocked 969 * source file or directory is unlocked 970 * destination's parent directory is locked 971 * destination file or directory is locked if it exists 972 * 973 * On exit: 974 * all denodes should be released 975 */ 976 static int 977 msdosfs_rename(ap) 978 struct vop_rename_args /* { 979 struct vnode *a_fdvp; 980 struct vnode *a_fvp; 981 struct componentname *a_fcnp; 982 struct vnode *a_tdvp; 983 struct vnode *a_tvp; 984 struct componentname *a_tcnp; 985 } */ *ap; 986 { 987 struct vnode *tdvp = ap->a_tdvp; 988 struct vnode *fvp = ap->a_fvp; 989 struct vnode *fdvp = ap->a_fdvp; 990 struct vnode *tvp = ap->a_tvp; 991 struct componentname *tcnp = ap->a_tcnp; 992 struct componentname *fcnp = ap->a_fcnp; 993 struct denode *ip, *xp, *dp, *zp; 994 u_char toname[12], oldname[11]; 995 u_long from_diroffset, to_diroffset; 996 u_char to_count; 997 int doingdirectory = 0, newparent = 0; 998 int error; 999 u_long cn, pcl; 1000 daddr_t bn; 1001 struct denode *fddep; /* from file's parent directory */ 1002 struct msdosfsmount *pmp; 1003 struct direntry *dotdotp; 1004 struct buf *bp; 1005 1006 fddep = VTODE(ap->a_fdvp); 1007 pmp = fddep->de_pmp; 1008 1009 pmp = VFSTOMSDOSFS(fdvp->v_mount); 1010 1011 #ifdef DIAGNOSTIC 1012 if ((tcnp->cn_flags & HASBUF) == 0 || 1013 (fcnp->cn_flags & HASBUF) == 0) 1014 panic("msdosfs_rename: no name"); 1015 #endif 1016 /* 1017 * Check for cross-device rename. 1018 */ 1019 if (fvp->v_mount != tdvp->v_mount || 1020 (tvp && fvp->v_mount != tvp->v_mount)) { 1021 error = EXDEV; 1022 abortit: 1023 if (tdvp == tvp) 1024 vrele(tdvp); 1025 else 1026 vput(tdvp); 1027 if (tvp) 1028 vput(tvp); 1029 vrele(fdvp); 1030 vrele(fvp); 1031 return (error); 1032 } 1033 1034 /* 1035 * If source and dest are the same, do nothing. 1036 */ 1037 if (tvp == fvp) { 1038 error = 0; 1039 goto abortit; 1040 } 1041 1042 error = vn_lock(fvp, LK_EXCLUSIVE); 1043 if (error) 1044 goto abortit; 1045 dp = VTODE(fdvp); 1046 ip = VTODE(fvp); 1047 1048 /* 1049 * Be sure we are not renaming ".", "..", or an alias of ".". This 1050 * leads to a crippled directory tree. It's pretty tough to do a 1051 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1052 * doesn't work if the ".." entry is missing. 1053 */ 1054 if (ip->de_Attributes & ATTR_DIRECTORY) { 1055 /* 1056 * Avoid ".", "..", and aliases of "." for obvious reasons. 1057 */ 1058 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1059 dp == ip || 1060 (fcnp->cn_flags & ISDOTDOT) || 1061 (tcnp->cn_flags & ISDOTDOT) || 1062 (ip->de_flag & DE_RENAME)) { 1063 VOP_UNLOCK(fvp, 0); 1064 error = EINVAL; 1065 goto abortit; 1066 } 1067 ip->de_flag |= DE_RENAME; 1068 doingdirectory++; 1069 } 1070 1071 /* 1072 * When the target exists, both the directory 1073 * and target vnodes are returned locked. 1074 */ 1075 dp = VTODE(tdvp); 1076 xp = tvp ? VTODE(tvp) : NULL; 1077 /* 1078 * Remember direntry place to use for destination 1079 */ 1080 to_diroffset = dp->de_fndoffset; 1081 to_count = dp->de_fndcnt; 1082 1083 /* 1084 * If ".." must be changed (ie the directory gets a new 1085 * parent) then the source directory must not be in the 1086 * directory hierarchy above the target, as this would 1087 * orphan everything below the source directory. Also 1088 * the user must have write permission in the source so 1089 * as to be able to change "..". We must repeat the call 1090 * to namei, as the parent directory is unlocked by the 1091 * call to doscheckpath(). 1092 */ 1093 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1094 VOP_UNLOCK(fvp, 0); 1095 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1096 newparent = 1; 1097 if (doingdirectory && newparent) { 1098 if (error) /* write access check above */ 1099 goto bad; 1100 if (xp != NULL) 1101 vput(tvp); 1102 /* 1103 * doscheckpath() vput()'s dp, 1104 * so we have to do a relookup afterwards 1105 */ 1106 error = doscheckpath(ip, dp); 1107 if (error) 1108 goto out; 1109 if ((tcnp->cn_flags & SAVESTART) == 0) 1110 panic("msdosfs_rename: lost to startdir"); 1111 error = relookup(tdvp, &tvp, tcnp); 1112 if (error) 1113 goto out; 1114 dp = VTODE(tdvp); 1115 xp = tvp ? VTODE(tvp) : NULL; 1116 } 1117 1118 if (xp != NULL) { 1119 /* 1120 * Target must be empty if a directory and have no links 1121 * to it. Also, ensure source and target are compatible 1122 * (both directories, or both not directories). 1123 */ 1124 if (xp->de_Attributes & ATTR_DIRECTORY) { 1125 if (!dosdirempty(xp)) { 1126 error = ENOTEMPTY; 1127 goto bad; 1128 } 1129 if (!doingdirectory) { 1130 error = ENOTDIR; 1131 goto bad; 1132 } 1133 cache_purge(tdvp); 1134 } else if (doingdirectory) { 1135 error = EISDIR; 1136 goto bad; 1137 } 1138 error = removede(dp, xp); 1139 if (error) 1140 goto bad; 1141 vput(tvp); 1142 xp = NULL; 1143 } 1144 1145 /* 1146 * Convert the filename in tcnp into a dos filename. We copy this 1147 * into the denode and directory entry for the destination 1148 * file/directory. 1149 */ 1150 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1151 if (error) 1152 goto abortit; 1153 1154 /* 1155 * Since from wasn't locked at various places above, 1156 * have to do a relookup here. 1157 */ 1158 fcnp->cn_flags &= ~MODMASK; 1159 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1160 if ((fcnp->cn_flags & SAVESTART) == 0) 1161 panic("msdosfs_rename: lost from startdir"); 1162 if (!newparent) 1163 VOP_UNLOCK(tdvp, 0); 1164 if (relookup(fdvp, &fvp, fcnp) == 0) 1165 vrele(fdvp); 1166 if (fvp == NULL) { 1167 /* 1168 * From name has disappeared. 1169 */ 1170 if (doingdirectory) 1171 panic("rename: lost dir entry"); 1172 if (newparent) 1173 VOP_UNLOCK(tdvp, 0); 1174 vrele(tdvp); 1175 vrele(ap->a_fvp); 1176 return 0; 1177 } 1178 xp = VTODE(fvp); 1179 zp = VTODE(fdvp); 1180 from_diroffset = zp->de_fndoffset; 1181 1182 /* 1183 * Ensure that the directory entry still exists and has not 1184 * changed till now. If the source is a file the entry may 1185 * have been unlinked or renamed. In either case there is 1186 * no further work to be done. If the source is a directory 1187 * then it cannot have been rmdir'ed or renamed; this is 1188 * prohibited by the DE_RENAME flag. 1189 */ 1190 if (xp != ip) { 1191 if (doingdirectory) 1192 panic("rename: lost dir entry"); 1193 VOP_UNLOCK(fvp, 0); 1194 if (newparent) 1195 VOP_UNLOCK(fdvp, 0); 1196 vrele(ap->a_fvp); 1197 xp = NULL; 1198 } else { 1199 vrele(fvp); 1200 xp = NULL; 1201 1202 /* 1203 * First write a new entry in the destination 1204 * directory and mark the entry in the source directory 1205 * as deleted. Then move the denode to the correct hash 1206 * chain for its new location in the filesystem. And, if 1207 * we moved a directory, then update its .. entry to point 1208 * to the new parent directory. 1209 */ 1210 bcopy(ip->de_Name, oldname, 11); 1211 bcopy(toname, ip->de_Name, 11); /* update denode */ 1212 dp->de_fndoffset = to_diroffset; 1213 dp->de_fndcnt = to_count; 1214 error = createde(ip, dp, (struct denode **)0, tcnp); 1215 if (error) { 1216 bcopy(oldname, ip->de_Name, 11); 1217 if (newparent) 1218 VOP_UNLOCK(fdvp, 0); 1219 VOP_UNLOCK(fvp, 0); 1220 goto bad; 1221 } 1222 ip->de_refcnt++; 1223 zp->de_fndoffset = from_diroffset; 1224 error = removede(zp, ip); 1225 if (error) { 1226 /* XXX should downgrade to ro here, fs is corrupt */ 1227 if (newparent) 1228 VOP_UNLOCK(fdvp, 0); 1229 VOP_UNLOCK(fvp, 0); 1230 goto bad; 1231 } 1232 if (!doingdirectory) { 1233 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1234 &ip->de_dirclust, 0); 1235 if (error) { 1236 /* XXX should downgrade to ro here, fs is corrupt */ 1237 if (newparent) 1238 VOP_UNLOCK(fdvp, 0); 1239 VOP_UNLOCK(fvp, 0); 1240 goto bad; 1241 } 1242 if (ip->de_dirclust == MSDOSFSROOT) 1243 ip->de_diroffset = to_diroffset; 1244 else 1245 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1246 } 1247 reinsert(ip); 1248 if (newparent) 1249 VOP_UNLOCK(fdvp, 0); 1250 } 1251 1252 /* 1253 * If we moved a directory to a new parent directory, then we must 1254 * fixup the ".." entry in the moved directory. 1255 */ 1256 if (doingdirectory && newparent) { 1257 cn = ip->de_StartCluster; 1258 if (cn == MSDOSFSROOT) { 1259 /* this should never happen */ 1260 panic("msdosfs_rename(): updating .. in root directory?"); 1261 } else 1262 bn = cntobn(pmp, cn); 1263 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1264 NOCRED, &bp); 1265 if (error) { 1266 /* XXX should downgrade to ro here, fs is corrupt */ 1267 brelse(bp); 1268 VOP_UNLOCK(fvp, 0); 1269 goto bad; 1270 } 1271 dotdotp = (struct direntry *)bp->b_data + 1; 1272 pcl = dp->de_StartCluster; 1273 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1274 pcl = MSDOSFSROOT; 1275 putushort(dotdotp->deStartCluster, pcl); 1276 if (FAT32(pmp)) 1277 putushort(dotdotp->deHighClust, pcl >> 16); 1278 if (DOINGASYNC(fvp)) 1279 bdwrite(bp); 1280 else if ((error = bwrite(bp)) != 0) { 1281 /* XXX should downgrade to ro here, fs is corrupt */ 1282 VOP_UNLOCK(fvp, 0); 1283 goto bad; 1284 } 1285 } 1286 1287 /* 1288 * The msdosfs lookup is case insensitive. Several aliases may 1289 * be inserted for a single directory entry. As a consequnce, 1290 * name cache purge done by lookup for fvp when DELETE op for 1291 * namei is specified, might be not enough to expunge all 1292 * namecache entries that were installed for this direntry. 1293 */ 1294 cache_purge(fvp); 1295 VOP_UNLOCK(fvp, 0); 1296 bad: 1297 if (xp) 1298 vput(tvp); 1299 vput(tdvp); 1300 out: 1301 ip->de_flag &= ~DE_RENAME; 1302 vrele(fdvp); 1303 vrele(fvp); 1304 return (error); 1305 1306 } 1307 1308 static struct { 1309 struct direntry dot; 1310 struct direntry dotdot; 1311 } dosdirtemplate = { 1312 { ". ", /* the . entry */ 1313 ATTR_DIRECTORY, /* file attribute */ 1314 0, /* reserved */ 1315 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1316 { 0, 0 }, /* access date */ 1317 { 0, 0 }, /* high bits of start cluster */ 1318 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1319 { 0, 0 }, /* startcluster */ 1320 { 0, 0, 0, 0 } /* filesize */ 1321 }, 1322 { ".. ", /* the .. entry */ 1323 ATTR_DIRECTORY, /* file attribute */ 1324 0, /* reserved */ 1325 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1326 { 0, 0 }, /* access date */ 1327 { 0, 0 }, /* high bits of start cluster */ 1328 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1329 { 0, 0 }, /* startcluster */ 1330 { 0, 0, 0, 0 } /* filesize */ 1331 } 1332 }; 1333 1334 static int 1335 msdosfs_mkdir(ap) 1336 struct vop_mkdir_args /* { 1337 struct vnode *a_dvp; 1338 struct vnode **a_vpp; 1339 struvt componentname *a_cnp; 1340 struct vattr *a_vap; 1341 } */ *ap; 1342 { 1343 struct componentname *cnp = ap->a_cnp; 1344 struct denode *dep; 1345 struct denode *pdep = VTODE(ap->a_dvp); 1346 struct direntry *denp; 1347 struct msdosfsmount *pmp = pdep->de_pmp; 1348 struct buf *bp; 1349 u_long newcluster, pcl; 1350 int bn; 1351 int error; 1352 struct denode ndirent; 1353 struct timespec ts; 1354 1355 /* 1356 * If this is the root directory and there is no space left we 1357 * can't do anything. This is because the root directory can not 1358 * change size. 1359 */ 1360 if (pdep->de_StartCluster == MSDOSFSROOT 1361 && pdep->de_fndoffset >= pdep->de_FileSize) { 1362 error = ENOSPC; 1363 goto bad2; 1364 } 1365 1366 /* 1367 * Allocate a cluster to hold the about to be created directory. 1368 */ 1369 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1370 if (error) 1371 goto bad2; 1372 1373 bzero(&ndirent, sizeof(ndirent)); 1374 ndirent.de_pmp = pmp; 1375 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1376 getnanotime(&ts); 1377 DETIMES(&ndirent, &ts, &ts, &ts); 1378 1379 /* 1380 * Now fill the cluster with the "." and ".." entries. And write 1381 * the cluster to disk. This way it is there for the parent 1382 * directory to be pointing at if there were a crash. 1383 */ 1384 bn = cntobn(pmp, newcluster); 1385 /* always succeeds */ 1386 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1387 bzero(bp->b_data, pmp->pm_bpcluster); 1388 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1389 denp = (struct direntry *)bp->b_data; 1390 putushort(denp[0].deStartCluster, newcluster); 1391 putushort(denp[0].deCDate, ndirent.de_CDate); 1392 putushort(denp[0].deCTime, ndirent.de_CTime); 1393 denp[0].deCHundredth = ndirent.de_CHun; 1394 putushort(denp[0].deADate, ndirent.de_ADate); 1395 putushort(denp[0].deMDate, ndirent.de_MDate); 1396 putushort(denp[0].deMTime, ndirent.de_MTime); 1397 pcl = pdep->de_StartCluster; 1398 /* 1399 * Although the root directory has a non-magic starting cluster 1400 * number for FAT32, chkdsk and fsck_msdosfs still require 1401 * references to it in dotdot entries to be magic. 1402 */ 1403 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1404 pcl = MSDOSFSROOT; 1405 putushort(denp[1].deStartCluster, pcl); 1406 putushort(denp[1].deCDate, ndirent.de_CDate); 1407 putushort(denp[1].deCTime, ndirent.de_CTime); 1408 denp[1].deCHundredth = ndirent.de_CHun; 1409 putushort(denp[1].deADate, ndirent.de_ADate); 1410 putushort(denp[1].deMDate, ndirent.de_MDate); 1411 putushort(denp[1].deMTime, ndirent.de_MTime); 1412 if (FAT32(pmp)) { 1413 putushort(denp[0].deHighClust, newcluster >> 16); 1414 putushort(denp[1].deHighClust, pcl >> 16); 1415 } 1416 1417 if (DOINGASYNC(ap->a_dvp)) 1418 bdwrite(bp); 1419 else if ((error = bwrite(bp)) != 0) 1420 goto bad; 1421 1422 /* 1423 * Now build up a directory entry pointing to the newly allocated 1424 * cluster. This will be written to an empty slot in the parent 1425 * directory. 1426 */ 1427 #ifdef DIAGNOSTIC 1428 if ((cnp->cn_flags & HASBUF) == 0) 1429 panic("msdosfs_mkdir: no name"); 1430 #endif 1431 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1432 if (error) 1433 goto bad; 1434 1435 ndirent.de_Attributes = ATTR_DIRECTORY; 1436 ndirent.de_LowerCase = 0; 1437 ndirent.de_StartCluster = newcluster; 1438 ndirent.de_FileSize = 0; 1439 error = createde(&ndirent, pdep, &dep, cnp); 1440 if (error) 1441 goto bad; 1442 *ap->a_vpp = DETOV(dep); 1443 return (0); 1444 1445 bad: 1446 clusterfree(pmp, newcluster, NULL); 1447 bad2: 1448 return (error); 1449 } 1450 1451 static int 1452 msdosfs_rmdir(ap) 1453 struct vop_rmdir_args /* { 1454 struct vnode *a_dvp; 1455 struct vnode *a_vp; 1456 struct componentname *a_cnp; 1457 } */ *ap; 1458 { 1459 struct vnode *vp = ap->a_vp; 1460 struct vnode *dvp = ap->a_dvp; 1461 struct componentname *cnp = ap->a_cnp; 1462 struct denode *ip, *dp; 1463 int error; 1464 1465 ip = VTODE(vp); 1466 dp = VTODE(dvp); 1467 1468 /* 1469 * Verify the directory is empty (and valid). 1470 * (Rmdir ".." won't be valid since 1471 * ".." will contain a reference to 1472 * the current directory and thus be 1473 * non-empty.) 1474 */ 1475 error = 0; 1476 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1477 error = ENOTEMPTY; 1478 goto out; 1479 } 1480 /* 1481 * Delete the entry from the directory. For dos filesystems this 1482 * gets rid of the directory entry on disk, the in memory copy 1483 * still exists but the de_refcnt is <= 0. This prevents it from 1484 * being found by deget(). When the vput() on dep is done we give 1485 * up access and eventually msdosfs_reclaim() will be called which 1486 * will remove it from the denode cache. 1487 */ 1488 error = removede(dp, ip); 1489 if (error) 1490 goto out; 1491 /* 1492 * This is where we decrement the link count in the parent 1493 * directory. Since dos filesystems don't do this we just purge 1494 * the name cache. 1495 */ 1496 cache_purge(dvp); 1497 /* 1498 * Truncate the directory that is being deleted. 1499 */ 1500 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1501 cache_purge(vp); 1502 1503 out: 1504 return (error); 1505 } 1506 1507 /* 1508 * DOS filesystems don't know what symlinks are. 1509 */ 1510 static int 1511 msdosfs_symlink(ap) 1512 struct vop_symlink_args /* { 1513 struct vnode *a_dvp; 1514 struct vnode **a_vpp; 1515 struct componentname *a_cnp; 1516 struct vattr *a_vap; 1517 char *a_target; 1518 } */ *ap; 1519 { 1520 return (EOPNOTSUPP); 1521 } 1522 1523 static int 1524 msdosfs_readdir(ap) 1525 struct vop_readdir_args /* { 1526 struct vnode *a_vp; 1527 struct uio *a_uio; 1528 struct ucred *a_cred; 1529 int *a_eofflag; 1530 int *a_ncookies; 1531 u_long **a_cookies; 1532 } */ *ap; 1533 { 1534 struct mbnambuf nb; 1535 int error = 0; 1536 int diff; 1537 long n; 1538 int blsize; 1539 long on; 1540 u_long cn; 1541 uint64_t fileno; 1542 u_long dirsperblk; 1543 long bias = 0; 1544 daddr_t bn, lbn; 1545 struct buf *bp; 1546 struct denode *dep = VTODE(ap->a_vp); 1547 struct msdosfsmount *pmp = dep->de_pmp; 1548 struct direntry *dentp; 1549 struct dirent dirbuf; 1550 struct uio *uio = ap->a_uio; 1551 u_long *cookies = NULL; 1552 int ncookies = 0; 1553 off_t offset, off; 1554 int chksum = -1; 1555 1556 #ifdef MSDOSFS_DEBUG 1557 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1558 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1559 #endif 1560 1561 /* 1562 * msdosfs_readdir() won't operate properly on regular files since 1563 * it does i/o only with the filesystem vnode, and hence can 1564 * retrieve the wrong block from the buffer cache for a plain file. 1565 * So, fail attempts to readdir() on a plain file. 1566 */ 1567 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1568 return (ENOTDIR); 1569 1570 /* 1571 * To be safe, initialize dirbuf 1572 */ 1573 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1574 1575 /* 1576 * If the user buffer is smaller than the size of one dos directory 1577 * entry or the file offset is not a multiple of the size of a 1578 * directory entry, then we fail the read. 1579 */ 1580 off = offset = uio->uio_offset; 1581 if (uio->uio_resid < sizeof(struct direntry) || 1582 (offset & (sizeof(struct direntry) - 1))) 1583 return (EINVAL); 1584 1585 if (ap->a_ncookies) { 1586 ncookies = uio->uio_resid / 16; 1587 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1588 M_WAITOK); 1589 *ap->a_cookies = cookies; 1590 *ap->a_ncookies = ncookies; 1591 } 1592 1593 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1594 1595 /* 1596 * If they are reading from the root directory then, we simulate 1597 * the . and .. entries since these don't exist in the root 1598 * directory. We also set the offset bias to make up for having to 1599 * simulate these entries. By this I mean that at file offset 64 we 1600 * read the first entry in the root directory that lives on disk. 1601 */ 1602 if (dep->de_StartCluster == MSDOSFSROOT 1603 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1604 #if 0 1605 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1606 offset); 1607 #endif 1608 bias = 2 * sizeof(struct direntry); 1609 if (offset < bias) { 1610 for (n = (int)offset / sizeof(struct direntry); 1611 n < 2; n++) { 1612 if (FAT32(pmp)) 1613 fileno = (uint64_t)cntobn(pmp, 1614 pmp->pm_rootdirblk) 1615 * dirsperblk; 1616 else 1617 fileno = 1; 1618 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1619 dirbuf.d_fileno = 1620 msdosfs_fileno_map(pmp->pm_mountp, 1621 fileno); 1622 } else { 1623 1624 dirbuf.d_fileno = (uint32_t)fileno; 1625 } 1626 dirbuf.d_type = DT_DIR; 1627 switch (n) { 1628 case 0: 1629 dirbuf.d_namlen = 1; 1630 strcpy(dirbuf.d_name, "."); 1631 break; 1632 case 1: 1633 dirbuf.d_namlen = 2; 1634 strcpy(dirbuf.d_name, ".."); 1635 break; 1636 } 1637 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1638 if (uio->uio_resid < dirbuf.d_reclen) 1639 goto out; 1640 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1641 if (error) 1642 goto out; 1643 offset += sizeof(struct direntry); 1644 off = offset; 1645 if (cookies) { 1646 *cookies++ = offset; 1647 if (--ncookies <= 0) 1648 goto out; 1649 } 1650 } 1651 } 1652 } 1653 1654 mbnambuf_init(&nb); 1655 off = offset; 1656 while (uio->uio_resid > 0) { 1657 lbn = de_cluster(pmp, offset - bias); 1658 on = (offset - bias) & pmp->pm_crbomask; 1659 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1660 diff = dep->de_FileSize - (offset - bias); 1661 if (diff <= 0) 1662 break; 1663 n = min(n, diff); 1664 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1665 if (error) 1666 break; 1667 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1668 if (error) { 1669 brelse(bp); 1670 return (error); 1671 } 1672 n = min(n, blsize - bp->b_resid); 1673 if (n == 0) { 1674 brelse(bp); 1675 return (EIO); 1676 } 1677 1678 /* 1679 * Convert from dos directory entries to fs-independent 1680 * directory entries. 1681 */ 1682 for (dentp = (struct direntry *)(bp->b_data + on); 1683 (char *)dentp < bp->b_data + on + n; 1684 dentp++, offset += sizeof(struct direntry)) { 1685 #if 0 1686 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1687 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1688 #endif 1689 /* 1690 * If this is an unused entry, we can stop. 1691 */ 1692 if (dentp->deName[0] == SLOT_EMPTY) { 1693 brelse(bp); 1694 goto out; 1695 } 1696 /* 1697 * Skip deleted entries. 1698 */ 1699 if (dentp->deName[0] == SLOT_DELETED) { 1700 chksum = -1; 1701 mbnambuf_init(&nb); 1702 continue; 1703 } 1704 1705 /* 1706 * Handle Win95 long directory entries 1707 */ 1708 if (dentp->deAttributes == ATTR_WIN95) { 1709 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1710 continue; 1711 chksum = win2unixfn(&nb, 1712 (struct winentry *)dentp, chksum, pmp); 1713 continue; 1714 } 1715 1716 /* 1717 * Skip volume labels 1718 */ 1719 if (dentp->deAttributes & ATTR_VOLUME) { 1720 chksum = -1; 1721 mbnambuf_init(&nb); 1722 continue; 1723 } 1724 /* 1725 * This computation of d_fileno must match 1726 * the computation of va_fileid in 1727 * msdosfs_getattr. 1728 */ 1729 if (dentp->deAttributes & ATTR_DIRECTORY) { 1730 fileno = getushort(dentp->deStartCluster); 1731 if (FAT32(pmp)) 1732 fileno |= getushort(dentp->deHighClust) << 16; 1733 /* if this is the root directory */ 1734 if (fileno == MSDOSFSROOT) 1735 if (FAT32(pmp)) 1736 fileno = (uint64_t)cntobn(pmp, 1737 pmp->pm_rootdirblk) 1738 * dirsperblk; 1739 else 1740 fileno = 1; 1741 else 1742 fileno = (uint64_t)cntobn(pmp, fileno) * 1743 dirsperblk; 1744 dirbuf.d_type = DT_DIR; 1745 } else { 1746 fileno = (uoff_t)offset / 1747 sizeof(struct direntry); 1748 dirbuf.d_type = DT_REG; 1749 } 1750 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1751 dirbuf.d_fileno = 1752 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1753 } else 1754 dirbuf.d_fileno = (uint32_t)fileno; 1755 1756 if (chksum != winChksum(dentp->deName)) { 1757 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1758 (u_char *)dirbuf.d_name, 1759 dentp->deLowerCase | 1760 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1761 (LCASE_BASE | LCASE_EXT) : 0), 1762 pmp); 1763 mbnambuf_init(&nb); 1764 } else 1765 mbnambuf_flush(&nb, &dirbuf); 1766 chksum = -1; 1767 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1768 if (uio->uio_resid < dirbuf.d_reclen) { 1769 brelse(bp); 1770 goto out; 1771 } 1772 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1773 if (error) { 1774 brelse(bp); 1775 goto out; 1776 } 1777 if (cookies) { 1778 *cookies++ = offset + sizeof(struct direntry); 1779 if (--ncookies <= 0) { 1780 brelse(bp); 1781 goto out; 1782 } 1783 } 1784 off = offset + sizeof(struct direntry); 1785 } 1786 brelse(bp); 1787 } 1788 out: 1789 /* Subtract unused cookies */ 1790 if (ap->a_ncookies) 1791 *ap->a_ncookies -= ncookies; 1792 1793 uio->uio_offset = off; 1794 1795 /* 1796 * Set the eofflag (NFS uses it) 1797 */ 1798 if (ap->a_eofflag) { 1799 if (dep->de_FileSize - (offset - bias) <= 0) 1800 *ap->a_eofflag = 1; 1801 else 1802 *ap->a_eofflag = 0; 1803 } 1804 return (error); 1805 } 1806 1807 /*- 1808 * a_vp - pointer to the file's vnode 1809 * a_bn - logical block number within the file (cluster number for us) 1810 * a_bop - where to return the bufobj of the special file containing the fs 1811 * a_bnp - where to return the "physical" block number corresponding to a_bn 1812 * (relative to the special file; units are blocks of size DEV_BSIZE) 1813 * a_runp - where to return the "run past" a_bn. This is the count of logical 1814 * blocks whose physical blocks (together with a_bn's physical block) 1815 * are contiguous. 1816 * a_runb - where to return the "run before" a_bn. 1817 */ 1818 static int 1819 msdosfs_bmap(ap) 1820 struct vop_bmap_args /* { 1821 struct vnode *a_vp; 1822 daddr_t a_bn; 1823 struct bufobj **a_bop; 1824 daddr_t *a_bnp; 1825 int *a_runp; 1826 int *a_runb; 1827 } */ *ap; 1828 { 1829 struct denode *dep; 1830 struct mount *mp; 1831 struct msdosfsmount *pmp; 1832 struct vnode *vp; 1833 daddr_t runbn; 1834 u_long cn; 1835 int bnpercn, error, maxio, maxrun, run; 1836 1837 vp = ap->a_vp; 1838 dep = VTODE(vp); 1839 pmp = dep->de_pmp; 1840 if (ap->a_bop != NULL) 1841 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1842 if (ap->a_bnp == NULL) 1843 return (0); 1844 if (ap->a_runp != NULL) 1845 *ap->a_runp = 0; 1846 if (ap->a_runb != NULL) 1847 *ap->a_runb = 0; 1848 cn = ap->a_bn; 1849 if (cn != ap->a_bn) 1850 return (EFBIG); 1851 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1852 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1853 return (error); 1854 1855 mp = vp->v_mount; 1856 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1857 bnpercn = de_cn2bn(pmp, 1); 1858 if (ap->a_runp != NULL) { 1859 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1860 for (run = 1; run <= maxrun; run++) { 1861 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1862 runbn != *ap->a_bnp + run * bnpercn) 1863 break; 1864 } 1865 *ap->a_runp = run - 1; 1866 } 1867 if (ap->a_runb != NULL) { 1868 maxrun = ulmin(maxio - 1, cn); 1869 for (run = 1; run < maxrun; run++) { 1870 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1871 runbn != *ap->a_bnp - run * bnpercn) 1872 break; 1873 } 1874 *ap->a_runb = run - 1; 1875 } 1876 return (0); 1877 } 1878 1879 static int 1880 msdosfs_strategy(ap) 1881 struct vop_strategy_args /* { 1882 struct vnode *a_vp; 1883 struct buf *a_bp; 1884 } */ *ap; 1885 { 1886 struct buf *bp = ap->a_bp; 1887 struct denode *dep = VTODE(ap->a_vp); 1888 struct bufobj *bo; 1889 int error = 0; 1890 daddr_t blkno; 1891 1892 /* 1893 * If we don't already know the filesystem relative block number 1894 * then get it using pcbmap(). If pcbmap() returns the block 1895 * number as -1 then we've got a hole in the file. DOS filesystems 1896 * don't allow files with holes, so we shouldn't ever see this. 1897 */ 1898 if (bp->b_blkno == bp->b_lblkno) { 1899 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1900 bp->b_blkno = blkno; 1901 if (error) { 1902 bp->b_error = error; 1903 bp->b_ioflags |= BIO_ERROR; 1904 bufdone(bp); 1905 return (0); 1906 } 1907 if ((long)bp->b_blkno == -1) 1908 vfs_bio_clrbuf(bp); 1909 } 1910 if (bp->b_blkno == -1) { 1911 bufdone(bp); 1912 return (0); 1913 } 1914 /* 1915 * Read/write the block from/to the disk that contains the desired 1916 * file block. 1917 */ 1918 bp->b_iooffset = dbtob(bp->b_blkno); 1919 bo = dep->de_pmp->pm_bo; 1920 BO_STRATEGY(bo, bp); 1921 return (0); 1922 } 1923 1924 static int 1925 msdosfs_print(ap) 1926 struct vop_print_args /* { 1927 struct vnode *vp; 1928 } */ *ap; 1929 { 1930 struct denode *dep = VTODE(ap->a_vp); 1931 1932 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1933 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1934 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1935 return (0); 1936 } 1937 1938 static int 1939 msdosfs_pathconf(ap) 1940 struct vop_pathconf_args /* { 1941 struct vnode *a_vp; 1942 int a_name; 1943 int *a_retval; 1944 } */ *ap; 1945 { 1946 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1947 1948 switch (ap->a_name) { 1949 case _PC_LINK_MAX: 1950 *ap->a_retval = 1; 1951 return (0); 1952 case _PC_NAME_MAX: 1953 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1954 return (0); 1955 case _PC_PATH_MAX: 1956 *ap->a_retval = PATH_MAX; 1957 return (0); 1958 case _PC_CHOWN_RESTRICTED: 1959 *ap->a_retval = 1; 1960 return (0); 1961 case _PC_NO_TRUNC: 1962 *ap->a_retval = 0; 1963 return (0); 1964 default: 1965 return (EINVAL); 1966 } 1967 /* NOTREACHED */ 1968 } 1969 1970 static int 1971 msdosfs_vptofh(ap) 1972 struct vop_vptofh_args /* { 1973 struct vnode *a_vp; 1974 struct fid *a_fhp; 1975 } */ *ap; 1976 { 1977 struct denode *dep; 1978 struct defid *defhp; 1979 1980 dep = VTODE(ap->a_vp); 1981 defhp = (struct defid *)ap->a_fhp; 1982 defhp->defid_len = sizeof(struct defid); 1983 defhp->defid_dirclust = dep->de_dirclust; 1984 defhp->defid_dirofs = dep->de_diroffset; 1985 /* defhp->defid_gen = dep->de_gen; */ 1986 return (0); 1987 } 1988 1989 /* Global vfs data structures for msdosfs */ 1990 struct vop_vector msdosfs_vnodeops = { 1991 .vop_default = &default_vnodeops, 1992 1993 .vop_access = msdosfs_access, 1994 .vop_bmap = msdosfs_bmap, 1995 .vop_cachedlookup = msdosfs_lookup, 1996 .vop_open = msdosfs_open, 1997 .vop_close = msdosfs_close, 1998 .vop_create = msdosfs_create, 1999 .vop_fsync = msdosfs_fsync, 2000 .vop_getattr = msdosfs_getattr, 2001 .vop_inactive = msdosfs_inactive, 2002 .vop_link = msdosfs_link, 2003 .vop_lookup = vfs_cache_lookup, 2004 .vop_mkdir = msdosfs_mkdir, 2005 .vop_mknod = msdosfs_mknod, 2006 .vop_pathconf = msdosfs_pathconf, 2007 .vop_print = msdosfs_print, 2008 .vop_read = msdosfs_read, 2009 .vop_readdir = msdosfs_readdir, 2010 .vop_reclaim = msdosfs_reclaim, 2011 .vop_remove = msdosfs_remove, 2012 .vop_rename = msdosfs_rename, 2013 .vop_rmdir = msdosfs_rmdir, 2014 .vop_setattr = msdosfs_setattr, 2015 .vop_strategy = msdosfs_strategy, 2016 .vop_symlink = msdosfs_symlink, 2017 .vop_write = msdosfs_write, 2018 .vop_vptofh = msdosfs_vptofh, 2019 }; 2020