1/* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 2 3/*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 8 * All rights reserved. 9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by TooLs GmbH. 22 * 4. The name of TooLs GmbH may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36/*- 37 * Written by Paul Popelka (paulp@uts.amdahl.com) 38 * 39 * You can do anything you want with this software, just don't say you wrote 40 * it, and don't remove this notice. 41 * 42 * This software is provided "as is". 43 * 44 * The author supplies this software to be publicly redistributed on the 45 * understanding that the author is not responsible for the correct 46 * functioning of this software in any circumstances and is not liable for 47 * any damages caused by this software. 48 * 49 * October 1992 50 */ 51 52#include <sys/param.h> 53#include <sys/systm.h> 54#include <sys/bio.h> 55#include <sys/buf.h> 56#include <sys/clock.h> 57#include <sys/dirent.h> 58#include <sys/lock.h> 59#include <sys/lockf.h> 60#include <sys/malloc.h> 61#include <sys/mount.h> 62#include <sys/mutex.h> 63#include <sys/namei.h> 64#include <sys/priv.h> 65#include <sys/stat.h> 66#include <sys/sysctl.h> 67#include <sys/unistd.h> 68#include <sys/vmmeter.h> 69#include <sys/vnode.h> 70 71#include <vm/vm.h> 72#include <vm/vm_extern.h> 73#include <vm/vnode_pager.h> 74 75#include <fs/msdosfs/bpb.h> 76#include <fs/msdosfs/direntry.h> 77#include <fs/msdosfs/denode.h> 78#include <fs/msdosfs/fat.h> 79#include <fs/msdosfs/msdosfsmount.h> 80 81/* 82 * Prototypes for MSDOSFS vnode operations 83 */ 84static vop_create_t msdosfs_create; 85static vop_mknod_t msdosfs_mknod; 86static vop_open_t msdosfs_open; 87static vop_close_t msdosfs_close; 88static vop_access_t msdosfs_access; 89static vop_getattr_t msdosfs_getattr; 90static vop_setattr_t msdosfs_setattr; 91static vop_read_t msdosfs_read; 92static vop_write_t msdosfs_write; 93static vop_fsync_t msdosfs_fsync; 94static vop_remove_t msdosfs_remove; 95static vop_link_t msdosfs_link; 96static vop_rename_t msdosfs_rename; 97static vop_mkdir_t msdosfs_mkdir; 98static vop_rmdir_t msdosfs_rmdir; 99static vop_symlink_t msdosfs_symlink; 100static vop_readdir_t msdosfs_readdir; 101static vop_bmap_t msdosfs_bmap; 102static vop_getpages_t msdosfs_getpages; 103static vop_strategy_t msdosfs_strategy; 104static vop_print_t msdosfs_print; 105static vop_pathconf_t msdosfs_pathconf; 106static vop_vptofh_t msdosfs_vptofh; 107 108/* 109 * Some general notes: 110 * 111 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 112 * read/written using the vnode for the filesystem. Blocks that represent 113 * the contents of a file are read/written using the vnode for the file 114 * (including directories when they are read/written as files). This 115 * presents problems for the dos filesystem because data that should be in 116 * an inode (if dos had them) resides in the directory itself. Since we 117 * must update directory entries without the benefit of having the vnode 118 * for the directory we must use the vnode for the filesystem. This means 119 * that when a directory is actually read/written (via read, write, or 120 * readdir, or seek) we must use the vnode for the filesystem instead of 121 * the vnode for the directory as would happen in ufs. This is to insure we 122 * retrieve the correct block from the buffer cache since the hash value is 123 * based upon the vnode address and the desired block number. 124 */ 125 126/* 127 * Create a regular file. On entry the directory to contain the file being 128 * created is locked. We must release before we return. We must also free 129 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error. 130 */ 131static int 132msdosfs_create(struct vop_create_args *ap) 133{ 134 struct componentname *cnp = ap->a_cnp; 135 struct denode ndirent; 136 struct denode *dep; 137 struct denode *pdep = VTODE(ap->a_dvp); 138 struct timespec ts; 139 int error; 140 141#ifdef MSDOSFS_DEBUG 142 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 143#endif 144 145 /* 146 * If this is the root directory and there is no space left we 147 * can't do anything. This is because the root directory can not 148 * change size. 149 */ 150 if (pdep->de_StartCluster == MSDOSFSROOT 151 && pdep->de_fndoffset >= pdep->de_FileSize) { 152 error = ENOSPC; 153 goto bad; 154 } 155 156 /* 157 * Create a directory entry for the file, then call createde() to 158 * have it installed. NOTE: DOS files are always executable. We 159 * use the absence of the owner write bit to make the file 160 * readonly. 161 */ 162 memset(&ndirent, 0, sizeof(ndirent)); 163 error = uniqdosname(pdep, cnp, ndirent.de_Name); 164 if (error) 165 goto bad; 166 167 ndirent.de_Attributes = ATTR_ARCHIVE; 168 ndirent.de_LowerCase = 0; 169 ndirent.de_StartCluster = 0; 170 ndirent.de_FileSize = 0; 171 ndirent.de_pmp = pdep->de_pmp; 172 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 173 vfs_timestamp(&ts); 174 DETIMES(&ndirent, &ts, &ts, &ts); 175 error = createde(&ndirent, pdep, &dep, cnp); 176 if (error) 177 goto bad; 178 *ap->a_vpp = DETOV(dep); 179 if ((cnp->cn_flags & MAKEENTRY) != 0) 180 cache_enter(ap->a_dvp, *ap->a_vpp, cnp); 181 return (0); 182 183bad: 184 return (error); 185} 186 187static int 188msdosfs_mknod(struct vop_mknod_args *ap) 189{ 190 191 return (EINVAL); 192} 193 194static int 195msdosfs_open(struct vop_open_args *ap) 196{ 197 struct denode *dep = VTODE(ap->a_vp); 198 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 199 return 0; 200} 201 202static int 203msdosfs_close(struct vop_close_args *ap) 204{ 205 struct vnode *vp = ap->a_vp; 206 struct denode *dep = VTODE(vp); 207 struct timespec ts; 208 209 VI_LOCK(vp); 210 if (vp->v_usecount > 1) { 211 vfs_timestamp(&ts); 212 DETIMES(dep, &ts, &ts, &ts); 213 } 214 VI_UNLOCK(vp); 215 return 0; 216} 217 218static int 219msdosfs_access(struct vop_access_args *ap) 220{ 221 struct vnode *vp = ap->a_vp; 222 struct denode *dep = VTODE(ap->a_vp); 223 struct msdosfsmount *pmp = dep->de_pmp; 224 mode_t file_mode; 225 accmode_t accmode = ap->a_accmode; 226 227 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 228 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 229 230 /* 231 * Disallow writing to directories and regular files if the 232 * filesystem is read-only. 233 */ 234 if (accmode & VWRITE) { 235 switch (vp->v_type) { 236 case VREG: 237 case VDIR: 238 if (vp->v_mount->mnt_flag & MNT_RDONLY) 239 return (EROFS); 240 break; 241 default: 242 break; 243 } 244 } 245 246 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 247 ap->a_accmode, ap->a_cred)); 248} 249 250static int 251msdosfs_getattr(struct vop_getattr_args *ap) 252{ 253 struct denode *dep = VTODE(ap->a_vp); 254 struct msdosfsmount *pmp = dep->de_pmp; 255 struct vattr *vap = ap->a_vap; 256 mode_t mode; 257 struct timespec ts; 258 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 259 uint64_t fileid; 260 261 vfs_timestamp(&ts); 262 DETIMES(dep, &ts, &ts, &ts); 263 vap->va_fsid = dev2udev(pmp->pm_dev); 264 /* 265 * The following computation of the fileid must be the same as that 266 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 267 * doesn't work. 268 */ 269 if (dep->de_Attributes & ATTR_DIRECTORY) { 270 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 271 dirsperblk; 272 if (dep->de_StartCluster == MSDOSFSROOT) 273 fileid = 1; 274 } else { 275 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 276 dirsperblk; 277 if (dep->de_dirclust == MSDOSFSROOT) 278 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 279 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 280 } 281 vap->va_fileid = fileid; 282 283 mode = S_IRWXU|S_IRWXG|S_IRWXO; 284 if (dep->de_Attributes & ATTR_READONLY) 285 mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH); 286 vap->va_mode = mode & 287 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 288 vap->va_uid = pmp->pm_uid; 289 vap->va_gid = pmp->pm_gid; 290 vap->va_nlink = 1; 291 vap->va_rdev = NODEV; 292 vap->va_size = dep->de_FileSize; 293 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 294 vap->va_ctime = vap->va_mtime; 295 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 296 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 297 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 298 0, &vap->va_birthtime); 299 } else { 300 vap->va_atime = vap->va_mtime; 301 vap->va_birthtime.tv_sec = -1; 302 vap->va_birthtime.tv_nsec = 0; 303 } 304 vap->va_flags = 0; 305 if (dep->de_Attributes & ATTR_ARCHIVE) 306 vap->va_flags |= UF_ARCHIVE; 307 if (dep->de_Attributes & ATTR_HIDDEN) 308 vap->va_flags |= UF_HIDDEN; 309 if (dep->de_Attributes & ATTR_READONLY) 310 vap->va_flags |= UF_READONLY; 311 if (dep->de_Attributes & ATTR_SYSTEM) 312 vap->va_flags |= UF_SYSTEM; 313 vap->va_gen = 0; 314 vap->va_blocksize = pmp->pm_bpcluster; 315 if (dep->de_StartCluster != MSDOSFSROOT) 316 vap->va_bytes = 317 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 318 else 319 vap->va_bytes = 0; /* FAT12/FAT16 root dir in reserved area */ 320 vap->va_type = ap->a_vp->v_type; 321 vap->va_filerev = dep->de_modrev; 322 return (0); 323} 324 325static int 326msdosfs_setattr(struct vop_setattr_args *ap) 327{ 328 struct vnode *vp = ap->a_vp; 329 struct denode *dep = VTODE(ap->a_vp); 330 struct msdosfsmount *pmp = dep->de_pmp; 331 struct vattr *vap = ap->a_vap; 332 struct ucred *cred = ap->a_cred; 333 struct thread *td = curthread; 334 int error = 0; 335 336#ifdef MSDOSFS_DEBUG 337 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 338 ap->a_vp, vap, cred); 339#endif 340 341 /* 342 * Check for unsettable attributes. 343 */ 344 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 345 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 346 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 347 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 348#ifdef MSDOSFS_DEBUG 349 printf("msdosfs_setattr(): returning EINVAL\n"); 350 printf(" va_type %d, va_nlink %llx, va_fsid %llx, va_fileid %llx\n", 351 vap->va_type, (unsigned long long)vap->va_nlink, 352 (unsigned long long)vap->va_fsid, 353 (unsigned long long)vap->va_fileid); 354 printf(" va_blocksize %lx, va_rdev %llx, va_bytes %llx, va_gen %lx\n", 355 vap->va_blocksize, (unsigned long long)vap->va_rdev, 356 (unsigned long long)vap->va_bytes, vap->va_gen); 357 printf(" va_uid %x, va_gid %x\n", 358 vap->va_uid, vap->va_gid); 359#endif 360 return (EINVAL); 361 } 362 363 /* 364 * We don't allow setting attributes on the root directory. 365 * The special case for the root directory is because before 366 * FAT32, the root directory didn't have an entry for itself 367 * (and was otherwise special). With FAT32, the root 368 * directory is not so special, but still doesn't have an 369 * entry for itself. 370 */ 371 if (vp->v_vflag & VV_ROOT) 372 return (EINVAL); 373 374 if (vap->va_flags != VNOVAL) { 375 if (vp->v_mount->mnt_flag & MNT_RDONLY) 376 return (EROFS); 377 if (cred->cr_uid != pmp->pm_uid) { 378 error = priv_check_cred(cred, PRIV_VFS_ADMIN); 379 if (error) 380 return (error); 381 } 382 /* 383 * We are very inconsistent about handling unsupported 384 * attributes. We ignored the access time and the 385 * read and execute bits. We were strict for the other 386 * attributes. 387 */ 388 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY | 389 UF_SYSTEM)) 390 return EOPNOTSUPP; 391 if (vap->va_flags & UF_ARCHIVE) 392 dep->de_Attributes |= ATTR_ARCHIVE; 393 else 394 dep->de_Attributes &= ~ATTR_ARCHIVE; 395 if (vap->va_flags & UF_HIDDEN) 396 dep->de_Attributes |= ATTR_HIDDEN; 397 else 398 dep->de_Attributes &= ~ATTR_HIDDEN; 399 /* We don't allow changing the readonly bit on directories. */ 400 if (vp->v_type != VDIR) { 401 if (vap->va_flags & UF_READONLY) 402 dep->de_Attributes |= ATTR_READONLY; 403 else 404 dep->de_Attributes &= ~ATTR_READONLY; 405 } 406 if (vap->va_flags & UF_SYSTEM) 407 dep->de_Attributes |= ATTR_SYSTEM; 408 else 409 dep->de_Attributes &= ~ATTR_SYSTEM; 410 dep->de_flag |= DE_MODIFIED; 411 } 412 413 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 414 uid_t uid; 415 gid_t gid; 416 417 if (vp->v_mount->mnt_flag & MNT_RDONLY) 418 return (EROFS); 419 uid = vap->va_uid; 420 if (uid == (uid_t)VNOVAL) 421 uid = pmp->pm_uid; 422 gid = vap->va_gid; 423 if (gid == (gid_t)VNOVAL) 424 gid = pmp->pm_gid; 425 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 426 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 427 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 428 if (error) 429 return (error); 430 } 431 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 432 return EINVAL; 433 } 434 435 if (vap->va_size != VNOVAL) { 436 switch (vp->v_type) { 437 case VDIR: 438 return (EISDIR); 439 case VREG: 440 /* 441 * Truncation is only supported for regular files, 442 * Disallow it if the filesystem is read-only. 443 */ 444 if (vp->v_mount->mnt_flag & MNT_RDONLY) 445 return (EROFS); 446 break; 447 default: 448 /* 449 * According to POSIX, the result is unspecified 450 * for file types other than regular files, 451 * directories and shared memory objects. We 452 * don't support any file types except regular 453 * files and directories in this file system, so 454 * this (default) case is unreachable and can do 455 * anything. Keep falling through to detrunc() 456 * for now. 457 */ 458 break; 459 } 460 error = vn_rlimit_trunc(vap->va_size, td); 461 if (error != 0) 462 return (error); 463 error = detrunc(dep, vap->va_size, 0, cred); 464 if (error) 465 return error; 466 } 467 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 468 if (vp->v_mount->mnt_flag & MNT_RDONLY) 469 return (EROFS); 470 error = vn_utimes_perm(vp, vap, cred, td); 471 if (error != 0) 472 return (error); 473 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 474 vap->va_atime.tv_sec != VNOVAL) { 475 dep->de_flag &= ~DE_ACCESS; 476 timespec2fattime(&vap->va_atime, 0, 477 &dep->de_ADate, NULL, NULL); 478 } 479 if (vap->va_mtime.tv_sec != VNOVAL) { 480 dep->de_flag &= ~DE_UPDATE; 481 timespec2fattime(&vap->va_mtime, 0, 482 &dep->de_MDate, &dep->de_MTime, NULL); 483 } 484 /* 485 * We don't set the archive bit when modifying the time of 486 * a directory to emulate the Windows/DOS behavior. 487 */ 488 if (vp->v_type != VDIR) 489 dep->de_Attributes |= ATTR_ARCHIVE; 490 dep->de_flag |= DE_MODIFIED; 491 } 492 /* 493 * DOS files only have the ability to have their writability 494 * attribute set, so we use the owner write bit to set the readonly 495 * attribute. 496 */ 497 if (vap->va_mode != (mode_t)VNOVAL) { 498 if (vp->v_mount->mnt_flag & MNT_RDONLY) 499 return (EROFS); 500 if (cred->cr_uid != pmp->pm_uid) { 501 error = priv_check_cred(cred, PRIV_VFS_ADMIN); 502 if (error) 503 return (error); 504 } 505 if (vp->v_type != VDIR) { 506 /* We ignore the read and execute bits. */ 507 if (vap->va_mode & S_IWUSR) 508 dep->de_Attributes &= ~ATTR_READONLY; 509 else 510 dep->de_Attributes |= ATTR_READONLY; 511 dep->de_Attributes |= ATTR_ARCHIVE; 512 dep->de_flag |= DE_MODIFIED; 513 } 514 } 515 return (deupdat(dep, 0)); 516} 517 518static int 519msdosfs_read(struct vop_read_args *ap) 520{ 521 int error = 0; 522 int blsize; 523 int isadir; 524 ssize_t orig_resid; 525 u_int n; 526 u_long diff; 527 u_long on; 528 daddr_t lbn; 529 daddr_t rablock; 530 int rasize; 531 int seqcount; 532 struct buf *bp; 533 struct vnode *vp = ap->a_vp; 534 struct denode *dep = VTODE(vp); 535 struct msdosfsmount *pmp = dep->de_pmp; 536 struct uio *uio = ap->a_uio; 537 538 /* 539 * If they didn't ask for any data, then we are done. 540 */ 541 orig_resid = uio->uio_resid; 542 if (orig_resid == 0) 543 return (0); 544 545 /* 546 * The caller is supposed to ensure that 547 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 548 * We don't need to check for large offsets as in ffs because 549 * dep->de_FileSize <= MSDOSFS_FILESIZE_MAX < OFF_MAX, so large 550 * offsets cannot cause overflow even in theory. 551 */ 552 553 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 554 555 isadir = dep->de_Attributes & ATTR_DIRECTORY; 556 do { 557 if (uio->uio_offset >= dep->de_FileSize) 558 break; 559 lbn = de_cluster(pmp, uio->uio_offset); 560 rablock = lbn + 1; 561 blsize = pmp->pm_bpcluster; 562 on = uio->uio_offset & pmp->pm_crbomask; 563 /* 564 * If we are operating on a directory file then be sure to 565 * do i/o with the vnode for the filesystem instead of the 566 * vnode for the directory. 567 */ 568 if (isadir) { 569 /* convert cluster # to block # */ 570 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 571 if (error == E2BIG) { 572 error = EINVAL; 573 break; 574 } else if (error) 575 break; 576 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 577 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 578 error = bread(vp, lbn, blsize, NOCRED, &bp); 579 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 580 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 581 NOCRED, on + uio->uio_resid, seqcount, 0, &bp); 582 } else if (seqcount > 1) { 583 rasize = blsize; 584 error = breadn(vp, lbn, 585 blsize, &rablock, &rasize, 1, NOCRED, &bp); 586 } else { 587 error = bread(vp, lbn, blsize, NOCRED, &bp); 588 } 589 if (error) { 590 brelse(bp); 591 break; 592 } 593 diff = pmp->pm_bpcluster - on; 594 n = diff > uio->uio_resid ? uio->uio_resid : diff; 595 diff = dep->de_FileSize - uio->uio_offset; 596 if (diff < n) 597 n = diff; 598 diff = blsize - bp->b_resid; 599 if (diff < n) 600 n = diff; 601 error = vn_io_fault_uiomove(bp->b_data + on, (int) n, uio); 602 brelse(bp); 603 } while (error == 0 && uio->uio_resid > 0 && n != 0); 604 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 605 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 606 dep->de_flag |= DE_ACCESS; 607 return (error); 608} 609 610/* 611 * Write data to a file or directory. 612 */ 613static int 614msdosfs_write(struct vop_write_args *ap) 615{ 616 int n; 617 int croffset; 618 ssize_t resid, r; 619 u_long osize; 620 int error = 0; 621 u_long count; 622 int seqcount; 623 daddr_t bn, lastcn; 624 struct buf *bp; 625 int ioflag = ap->a_ioflag; 626 struct uio *uio = ap->a_uio; 627 struct vnode *vp = ap->a_vp; 628 struct vnode *thisvp; 629 struct denode *dep = VTODE(vp); 630 struct msdosfsmount *pmp = dep->de_pmp; 631 struct ucred *cred = ap->a_cred; 632 633#ifdef MSDOSFS_DEBUG 634 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 635 vp, uio, ioflag, cred); 636 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 637 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 638#endif 639 640 switch (vp->v_type) { 641 case VREG: 642 if (ioflag & IO_APPEND) 643 uio->uio_offset = dep->de_FileSize; 644 thisvp = vp; 645 break; 646 case VDIR: 647 return EISDIR; 648 default: 649 panic("msdosfs_write(): bad file type"); 650 } 651 652 /* 653 * This is needed (unlike in ffs_write()) because we extend the 654 * file outside of the loop but we don't want to extend the file 655 * for writes of 0 bytes. 656 */ 657 if (uio->uio_resid == 0) 658 return (0); 659 660 /* 661 * The caller is supposed to ensure that 662 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 663 * 664 * If they've exceeded their filesize limit, tell them about it. 665 */ 666 error = vn_rlimit_fsizex(vp, uio, MSDOSFS_FILESIZE_MAX, &r, 667 uio->uio_td); 668 if (error != 0) { 669 vn_rlimit_fsizex_res(uio, r); 670 return (error); 671 } 672 673 /* 674 * If the offset we are starting the write at is beyond the end of 675 * the file, then they've done a seek. Unix filesystems allow 676 * files with holes in them, DOS doesn't so we must fill the hole 677 * with zeroed blocks. 678 */ 679 if (uio->uio_offset > dep->de_FileSize) { 680 error = deextend(dep, uio->uio_offset, cred); 681 if (error != 0) { 682 vn_rlimit_fsizex_res(uio, r); 683 return (error); 684 } 685 } 686 687 /* 688 * Remember some values in case the write fails. 689 */ 690 resid = uio->uio_resid; 691 osize = dep->de_FileSize; 692 693 /* 694 * If we write beyond the end of the file, extend it to its ultimate 695 * size ahead of the time to hopefully get a contiguous area. 696 */ 697 if (uio->uio_offset + resid > osize) { 698 count = de_clcount(pmp, uio->uio_offset + resid) - 699 de_clcount(pmp, osize); 700 error = extendfile(dep, count, NULL, NULL, 0); 701 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 702 goto errexit; 703 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 704 } else 705 lastcn = de_clcount(pmp, osize) - 1; 706 707 seqcount = ioflag >> IO_SEQSHIFT; 708 do { 709 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 710 error = ENOSPC; 711 break; 712 } 713 714 croffset = uio->uio_offset & pmp->pm_crbomask; 715 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 716 if (uio->uio_offset + n > dep->de_FileSize) { 717 dep->de_FileSize = uio->uio_offset + n; 718 /* The object size needs to be set before buffer is allocated */ 719 vnode_pager_setsize(vp, dep->de_FileSize); 720 } 721 722 bn = de_cluster(pmp, uio->uio_offset); 723 if ((uio->uio_offset & pmp->pm_crbomask) == 0 724 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 725 > de_cluster(pmp, uio->uio_offset) 726 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 727 /* 728 * If either the whole cluster gets written, 729 * or we write the cluster from its start beyond EOF, 730 * then no need to read data from disk. 731 */ 732 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 733 /* 734 * This call to vfs_bio_clrbuf() ensures that 735 * even if vn_io_fault_uiomove() below faults, 736 * garbage from the newly instantiated buffer 737 * is not exposed to the userspace via mmap(). 738 */ 739 vfs_bio_clrbuf(bp); 740 /* 741 * Do the bmap now, since pcbmap needs buffers 742 * for the FAT table. (see msdosfs_strategy) 743 */ 744 if (bp->b_blkno == bp->b_lblkno) { 745 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 746 if (error) 747 bp->b_blkno = -1; 748 else 749 bp->b_blkno = bn; 750 } 751 if (bp->b_blkno == -1) { 752 brelse(bp); 753 if (!error) 754 error = EIO; /* XXX */ 755 break; 756 } 757 } else { 758 /* 759 * The block we need to write into exists, so read it in. 760 */ 761 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 762 if (error) { 763 break; 764 } 765 } 766 767 /* 768 * Should these vnode_pager_* functions be done on dir 769 * files? 770 */ 771 772 /* 773 * Copy the data from user space into the buf header. 774 */ 775 error = vn_io_fault_uiomove(bp->b_data + croffset, n, uio); 776 if (error) { 777 brelse(bp); 778 break; 779 } 780 781 /* Prepare for clustered writes in some else clauses. */ 782 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 783 bp->b_flags |= B_CLUSTEROK; 784 785 /* 786 * If IO_SYNC, then each buffer is written synchronously. 787 * Otherwise, if we have a severe page deficiency then 788 * write the buffer asynchronously. Otherwise, if on a 789 * cluster boundary then write the buffer asynchronously, 790 * combining it with contiguous clusters if permitted and 791 * possible, since we don't expect more writes into this 792 * buffer soon. Otherwise, do a delayed write because we 793 * expect more writes into this buffer soon. 794 */ 795 if (ioflag & IO_SYNC) 796 (void)bwrite(bp); 797 else if (vm_page_count_severe() || buf_dirty_count_severe()) 798 bawrite(bp); 799 else if (n + croffset == pmp->pm_bpcluster) { 800 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 801 cluster_write(vp, &dep->de_clusterw, bp, 802 dep->de_FileSize, seqcount, 0); 803 else 804 bawrite(bp); 805 } else 806 bdwrite(bp); 807 dep->de_flag |= DE_UPDATE; 808 } while (error == 0 && uio->uio_resid > 0); 809 810 /* 811 * If the write failed and they want us to, truncate the file back 812 * to the size it was before the write was attempted. 813 */ 814errexit: 815 if (error) { 816 if (ioflag & IO_UNIT) { 817 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 818 uio->uio_offset -= resid - uio->uio_resid; 819 uio->uio_resid = resid; 820 } else { 821 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 822 if (uio->uio_resid != resid) 823 error = 0; 824 } 825 } else if (ioflag & IO_SYNC) 826 error = deupdat(dep, 1); 827 vn_rlimit_fsizex_res(uio, r); 828 return (error); 829} 830 831/* 832 * Flush the blocks of a file to disk. 833 */ 834static int 835msdosfs_fsync(struct vop_fsync_args *ap) 836{ 837 struct vnode *devvp; 838 int allerror, error; 839 840 vop_stdfsync(ap); 841 842 /* 843 * If the syncing request comes from fsync(2), sync the entire 844 * FAT and any other metadata that happens to be on devvp. We 845 * need this mainly for the FAT. We write the FAT sloppily, and 846 * syncing it all now is the best we can easily do to get all 847 * directory entries associated with the file (not just the file) 848 * fully synced. The other metadata includes critical metadata 849 * for all directory entries, but only in the MNT_ASYNC case. We 850 * will soon sync all metadata in the file's directory entry. 851 * Non-critical metadata for associated directory entries only 852 * gets synced accidentally, as in most file systems. 853 */ 854 if (ap->a_waitfor != MNT_NOWAIT) { 855 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 856 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 857 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 858 VOP_UNLOCK(devvp); 859 } else 860 allerror = 0; 861 862 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor != MNT_NOWAIT); 863 if (allerror == 0) 864 allerror = error; 865 return (allerror); 866} 867 868static int 869msdosfs_remove(struct vop_remove_args *ap) 870{ 871 struct denode *dep = VTODE(ap->a_vp); 872 struct denode *ddep = VTODE(ap->a_dvp); 873 int error; 874 875 if (ap->a_vp->v_type == VDIR) 876 error = EPERM; 877 else 878 error = removede(ddep, dep); 879#ifdef MSDOSFS_DEBUG 880 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 881#endif 882 return (error); 883} 884 885/* 886 * DOS filesystems don't know what links are. 887 */ 888static int 889msdosfs_link(struct vop_link_args *ap) 890{ 891 return (EOPNOTSUPP); 892} 893 894/* 895 * Renames on files require moving the denode to a new hash queue since the 896 * denode's location is used to compute which hash queue to put the file 897 * in. Unless it is a rename in place. For example "mv a b". 898 * 899 * What follows is the basic algorithm: 900 * 901 * if (file move) { 902 * if (dest file exists) { 903 * remove dest file 904 * } 905 * if (dest and src in same directory) { 906 * rewrite name in existing directory slot 907 * } else { 908 * write new entry in dest directory 909 * update offset and dirclust in denode 910 * move denode to new hash chain 911 * clear old directory entry 912 * } 913 * } else { 914 * directory move 915 * if (dest directory exists) { 916 * if (dest is not empty) { 917 * return ENOTEMPTY 918 * } 919 * remove dest directory 920 * } 921 * if (dest and src in same directory) { 922 * rewrite name in existing entry 923 * } else { 924 * be sure dest is not a child of src directory 925 * write entry in dest directory 926 * update "." and ".." in moved directory 927 * clear old directory entry for moved directory 928 * } 929 * } 930 * 931 * On entry: 932 * source's parent directory is unlocked 933 * source file or directory is unlocked 934 * destination's parent directory is locked 935 * destination file or directory is locked if it exists 936 * 937 * On exit: 938 * all denodes should be released 939 */ 940static int 941msdosfs_rename(struct vop_rename_args *ap) 942{ 943 struct vnode *fdvp, *fvp, *tdvp, *tvp, *vp; 944 struct componentname *fcnp, *tcnp; 945 struct denode *fdip, *fip, *tdip, *tip, *nip; 946 u_char toname[12], oldname[11]; 947 u_long to_diroffset; 948 bool checkpath_locked, doingdirectory, newparent; 949 int error; 950 u_long cn, pcl, blkoff; 951 daddr_t bn, wait_scn, scn; 952 struct msdosfsmount *pmp; 953 struct direntry *dotdotp; 954 struct buf *bp; 955 956 tdvp = ap->a_tdvp; 957 fvp = ap->a_fvp; 958 fdvp = ap->a_fdvp; 959 tvp = ap->a_tvp; 960 tcnp = ap->a_tcnp; 961 fcnp = ap->a_fcnp; 962 pmp = VFSTOMSDOSFS(fdvp->v_mount); 963 964 /* 965 * Check for cross-device rename. 966 */ 967 if (fvp->v_mount != tdvp->v_mount || 968 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 969 error = EXDEV; 970 goto abortit; 971 } 972 973 /* 974 * If source and dest are the same, do nothing. 975 */ 976 if (tvp == fvp) { 977 error = 0; 978 goto abortit; 979 } 980 981 /* 982 * When the target exists, both the directory 983 * and target vnodes are passed locked. 984 */ 985 VOP_UNLOCK(tdvp); 986 if (tvp != NULL && tvp != tdvp) 987 VOP_UNLOCK(tvp); 988 989 checkpath_locked = false; 990 991relock: 992 doingdirectory = newparent = false; 993 994 error = vn_lock(fdvp, LK_EXCLUSIVE); 995 if (error != 0) 996 goto releout; 997 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 998 VOP_UNLOCK(fdvp); 999 error = vn_lock(tdvp, LK_EXCLUSIVE); 1000 if (error != 0) 1001 goto releout; 1002 VOP_UNLOCK(tdvp); 1003 goto relock; 1004 } 1005 1006 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1007 if (error != 0) { 1008 VOP_UNLOCK(fdvp); 1009 VOP_UNLOCK(tdvp); 1010 goto releout; 1011 } 1012 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, &nip); 1013 if (error != 0) { 1014 VOP_UNLOCK(fdvp); 1015 VOP_UNLOCK(tdvp); 1016 if (error != EBUSY) 1017 goto releout; 1018 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, &nip); 1019 if (error != 0) 1020 goto releout; 1021 vp = fvp; 1022 fvp = DETOV(nip); 1023 VOP_UNLOCK(fvp); 1024 vrele(vp); 1025 goto relock; 1026 } 1027 vrele(fvp); 1028 fvp = DETOV(nip); 1029 1030 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1031 if (error != 0 && error != EJUSTRETURN) { 1032 VOP_UNLOCK(fdvp); 1033 VOP_UNLOCK(tdvp); 1034 VOP_UNLOCK(fvp); 1035 goto releout; 1036 } 1037 if (error == EJUSTRETURN && tvp != NULL) { 1038 vrele(tvp); 1039 tvp = NULL; 1040 } 1041 if (error == 0) { 1042 nip = NULL; 1043 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, 1044 &nip); 1045 if (tvp != NULL) { 1046 vrele(tvp); 1047 tvp = NULL; 1048 } 1049 if (error != 0) { 1050 VOP_UNLOCK(fdvp); 1051 VOP_UNLOCK(tdvp); 1052 VOP_UNLOCK(fvp); 1053 if (error != EBUSY) 1054 goto releout; 1055 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, 1056 &nip); 1057 if (error != 0) 1058 goto releout; 1059 vput(DETOV(nip)); 1060 goto relock; 1061 } 1062 tvp = DETOV(nip); 1063 } 1064 1065 fdip = VTODE(fdvp); 1066 fip = VTODE(fvp); 1067 tdip = VTODE(tdvp); 1068 tip = tvp != NULL ? VTODE(tvp) : NULL; 1069 1070 /* 1071 * Remember direntry place to use for destination 1072 */ 1073 to_diroffset = tdip->de_fndoffset; 1074 1075 /* 1076 * Be sure we are not renaming ".", "..", or an alias of ".". This 1077 * leads to a crippled directory tree. It's pretty tough to do a 1078 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1079 * doesn't work if the ".." entry is missing. 1080 */ 1081 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) { 1082 /* 1083 * Avoid ".", "..", and aliases of "." for obvious reasons. 1084 */ 1085 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1086 fdip == fip || 1087 (fcnp->cn_flags & ISDOTDOT) != 0 || 1088 (tcnp->cn_flags & ISDOTDOT) != 0) { 1089 error = EINVAL; 1090 goto unlock; 1091 } 1092 doingdirectory = true; 1093 } 1094 1095 /* 1096 * If ".." must be changed (ie the directory gets a new 1097 * parent) then the source directory must not be in the 1098 * directory hierarchy above the target, as this would 1099 * orphan everything below the source directory. Also 1100 * the user must have write permission in the source so 1101 * as to be able to change "..". We must repeat the call 1102 * to namei, as the parent directory is unlocked by the 1103 * call to doscheckpath(). 1104 */ 1105 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, curthread); 1106 if (fdip->de_StartCluster != tdip->de_StartCluster) 1107 newparent = true; 1108 if (doingdirectory && newparent) { 1109 if (error != 0) /* write access check above */ 1110 goto unlock; 1111 lockmgr(&pmp->pm_checkpath_lock, LK_EXCLUSIVE, NULL); 1112 checkpath_locked = true; 1113 error = doscheckpath(fip, tdip, &wait_scn); 1114 if (wait_scn != 0) { 1115 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1116 checkpath_locked = false; 1117 VOP_UNLOCK(fdvp); 1118 VOP_UNLOCK(tdvp); 1119 VOP_UNLOCK(fvp); 1120 if (tvp != NULL && tvp != tdvp) 1121 VOP_UNLOCK(tvp); 1122 error = deget(pmp, wait_scn, 0, LK_EXCLUSIVE, 1123 &nip); 1124 if (error == 0) { 1125 vput(DETOV(nip)); 1126 goto relock; 1127 } 1128 } 1129 if (error != 0) 1130 goto unlock; 1131 } 1132 1133 if (tip != NULL) { 1134 /* 1135 * Target must be empty if a directory and have no links 1136 * to it. Also, ensure source and target are compatible 1137 * (both directories, or both not directories). 1138 */ 1139 if ((tip->de_Attributes & ATTR_DIRECTORY) != 0) { 1140 if (!dosdirempty(tip)) { 1141 error = ENOTEMPTY; 1142 goto unlock; 1143 } 1144 if (!doingdirectory) { 1145 error = ENOTDIR; 1146 goto unlock; 1147 } 1148 cache_purge(tdvp); 1149 } else if (doingdirectory) { 1150 error = EISDIR; 1151 goto unlock; 1152 } 1153 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1154 MPASS(error == 0); 1155 error = removede(tdip, tip); 1156 if (error != 0) 1157 goto unlock; 1158 vput(tvp); 1159 tvp = NULL; 1160 tip = NULL; 1161 } 1162 1163 /* 1164 * Convert the filename in tcnp into a dos filename. We copy this 1165 * into the denode and directory entry for the destination 1166 * file/directory. 1167 */ 1168 error = uniqdosname(tdip, tcnp, toname); 1169 if (error != 0) 1170 goto unlock; 1171 1172 /* 1173 * First write a new entry in the destination 1174 * directory and mark the entry in the source directory 1175 * as deleted. Then move the denode to the correct hash 1176 * chain for its new location in the filesystem. And, if 1177 * we moved a directory, then update its .. entry to point 1178 * to the new parent directory. 1179 */ 1180 memcpy(oldname, fip->de_Name, 11); 1181 memcpy(fip->de_Name, toname, 11); /* update denode */ 1182 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1183 if (error == EJUSTRETURN) { 1184 tdip->de_fndoffset = to_diroffset; 1185 error = createde(fip, tdip, NULL, tcnp); 1186 } 1187 if (error != 0) { 1188 memcpy(fip->de_Name, oldname, 11); 1189 goto unlock; 1190 } 1191 1192 /* 1193 * If fip is for a directory, then its name should always 1194 * be "." since it is for the directory entry in the 1195 * directory itself (msdosfs_lookup() always translates 1196 * to the "." entry so as to get a unique denode, except 1197 * for the root directory there are different 1198 * complications). However, we just corrupted its name 1199 * to pass the correct name to createde(). Undo this. 1200 */ 1201 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) 1202 memcpy(fip->de_Name, oldname, 11); 1203 fip->de_refcnt++; 1204 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1205 MPASS(error == 0); 1206 error = removede(fdip, fip); 1207 if (error != 0) { 1208 printf("%s: removede %s %s err %d\n", 1209 pmp->pm_mountp->mnt_stat.f_mntonname, 1210 fdip->de_Name, fip->de_Name, error); 1211 msdosfs_integrity_error(pmp); 1212 goto unlock; 1213 } 1214 if (!doingdirectory) { 1215 error = pcbmap(tdip, de_cluster(pmp, to_diroffset), 0, 1216 &fip->de_dirclust, 0); 1217 if (error != 0) { 1218 /* 1219 * XXX should downgrade to ro here, 1220 * fs is corrupt 1221 */ 1222 goto unlock; 1223 } 1224 if (fip->de_dirclust == MSDOSFSROOT) 1225 fip->de_diroffset = to_diroffset; 1226 else 1227 fip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1228 } 1229 reinsert(fip); 1230 1231 /* 1232 * If we moved a directory to a new parent directory, then we must 1233 * fixup the ".." entry in the moved directory. 1234 */ 1235 if (doingdirectory && newparent) { 1236 cn = fip->de_StartCluster; 1237 if (cn == MSDOSFSROOT) { 1238 /* this should never happen */ 1239 panic("msdosfs_rename(): updating .. in root directory?"); 1240 } else 1241 bn = cntobn(pmp, cn); 1242 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1243 NOCRED, &bp); 1244 if (error != 0) { 1245 printf("%s: block read error %d while renaming dir\n", 1246 pmp->pm_mountp->mnt_stat.f_mntonname, 1247 error); 1248 msdosfs_integrity_error(pmp); 1249 goto unlock; 1250 } 1251 dotdotp = (struct direntry *)bp->b_data + 1; 1252 pcl = tdip->de_StartCluster; 1253 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1254 pcl = MSDOSFSROOT; 1255 putushort(dotdotp->deStartCluster, pcl); 1256 if (FAT32(pmp)) 1257 putushort(dotdotp->deHighClust, pcl >> 16); 1258 if (DOINGASYNC(fvp)) 1259 bdwrite(bp); 1260 else if ((error = bwrite(bp)) != 0) { 1261 printf("%s: block write error %d while renaming dir\n", 1262 pmp->pm_mountp->mnt_stat.f_mntonname, 1263 error); 1264 msdosfs_integrity_error(pmp); 1265 goto unlock; 1266 } 1267 } 1268 1269 /* 1270 * The msdosfs lookup is case insensitive. Several aliases may 1271 * be inserted for a single directory entry. As a consequnce, 1272 * name cache purge done by lookup for fvp when DELETE op for 1273 * namei is specified, might be not enough to expunge all 1274 * namecache entries that were installed for this direntry. 1275 */ 1276 cache_purge(fvp); 1277 1278unlock: 1279 if (checkpath_locked) 1280 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1281 vput(fdvp); 1282 vput(fvp); 1283 if (tvp != NULL) { 1284 if (tvp != tdvp) 1285 vput(tvp); 1286 else 1287 vrele(tvp); 1288 } 1289 vput(tdvp); 1290 return (error); 1291releout: 1292 MPASS(!checkpath_locked); 1293 vrele(tdvp); 1294 if (tvp != NULL) 1295 vrele(tvp); 1296 vrele(fdvp); 1297 vrele(fvp); 1298 return (error); 1299abortit: 1300 if (tdvp == tvp) 1301 vrele(tdvp); 1302 else 1303 vput(tdvp); 1304 if (tvp != NULL) 1305 vput(tvp); 1306 vrele(fdvp); 1307 vrele(fvp); 1308 return (error); 1309} 1310 1311static struct { 1312 struct direntry dot; 1313 struct direntry dotdot; 1314} dosdirtemplate = { 1315 { ". ", /* the . entry */ 1316 ATTR_DIRECTORY, /* file attribute */ 1317 0, /* reserved */ 1318 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1319 { 0, 0 }, /* access date */ 1320 { 0, 0 }, /* high bits of start cluster */ 1321 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1322 { 0, 0 }, /* startcluster */ 1323 { 0, 0, 0, 0 } /* filesize */ 1324 }, 1325 { ".. ", /* the .. entry */ 1326 ATTR_DIRECTORY, /* file attribute */ 1327 0, /* reserved */ 1328 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1329 { 0, 0 }, /* access date */ 1330 { 0, 0 }, /* high bits of start cluster */ 1331 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1332 { 0, 0 }, /* startcluster */ 1333 { 0, 0, 0, 0 } /* filesize */ 1334 } 1335}; 1336 1337static int 1338msdosfs_mkdir(struct vop_mkdir_args *ap) 1339{ 1340 struct componentname *cnp = ap->a_cnp; 1341 struct denode *dep; 1342 struct denode *pdep = VTODE(ap->a_dvp); 1343 struct direntry *denp; 1344 struct msdosfsmount *pmp = pdep->de_pmp; 1345 struct buf *bp; 1346 u_long newcluster, pcl; 1347 int bn; 1348 int error; 1349 struct denode ndirent; 1350 struct timespec ts; 1351 1352 /* 1353 * If this is the root directory and there is no space left we 1354 * can't do anything. This is because the root directory can not 1355 * change size. 1356 */ 1357 if (pdep->de_StartCluster == MSDOSFSROOT 1358 && pdep->de_fndoffset >= pdep->de_FileSize) { 1359 error = ENOSPC; 1360 goto bad2; 1361 } 1362 1363 /* 1364 * Allocate a cluster to hold the about to be created directory. 1365 */ 1366 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1367 if (error) 1368 goto bad2; 1369 1370 memset(&ndirent, 0, sizeof(ndirent)); 1371 ndirent.de_pmp = pmp; 1372 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1373 vfs_timestamp(&ts); 1374 DETIMES(&ndirent, &ts, &ts, &ts); 1375 1376 /* 1377 * Now fill the cluster with the "." and ".." entries. And write 1378 * the cluster to disk. This way it is there for the parent 1379 * directory to be pointing at if there were a crash. 1380 */ 1381 bn = cntobn(pmp, newcluster); 1382 /* always succeeds */ 1383 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1384 memset(bp->b_data, 0, pmp->pm_bpcluster); 1385 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1386 denp = (struct direntry *)bp->b_data; 1387 putushort(denp[0].deStartCluster, newcluster); 1388 putushort(denp[0].deCDate, ndirent.de_CDate); 1389 putushort(denp[0].deCTime, ndirent.de_CTime); 1390 denp[0].deCHundredth = ndirent.de_CHun; 1391 putushort(denp[0].deADate, ndirent.de_ADate); 1392 putushort(denp[0].deMDate, ndirent.de_MDate); 1393 putushort(denp[0].deMTime, ndirent.de_MTime); 1394 pcl = pdep->de_StartCluster; 1395 /* 1396 * Although the root directory has a non-magic starting cluster 1397 * number for FAT32, chkdsk and fsck_msdosfs still require 1398 * references to it in dotdot entries to be magic. 1399 */ 1400 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1401 pcl = MSDOSFSROOT; 1402 putushort(denp[1].deStartCluster, pcl); 1403 putushort(denp[1].deCDate, ndirent.de_CDate); 1404 putushort(denp[1].deCTime, ndirent.de_CTime); 1405 denp[1].deCHundredth = ndirent.de_CHun; 1406 putushort(denp[1].deADate, ndirent.de_ADate); 1407 putushort(denp[1].deMDate, ndirent.de_MDate); 1408 putushort(denp[1].deMTime, ndirent.de_MTime); 1409 if (FAT32(pmp)) { 1410 putushort(denp[0].deHighClust, newcluster >> 16); 1411 putushort(denp[1].deHighClust, pcl >> 16); 1412 } 1413 1414 if (DOINGASYNC(ap->a_dvp)) 1415 bdwrite(bp); 1416 else if ((error = bwrite(bp)) != 0) 1417 goto bad; 1418 1419 /* 1420 * Now build up a directory entry pointing to the newly allocated 1421 * cluster. This will be written to an empty slot in the parent 1422 * directory. 1423 */ 1424 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1425 if (error) 1426 goto bad; 1427 1428 ndirent.de_Attributes = ATTR_DIRECTORY; 1429 ndirent.de_LowerCase = 0; 1430 ndirent.de_StartCluster = newcluster; 1431 ndirent.de_FileSize = 0; 1432 error = createde(&ndirent, pdep, &dep, cnp); 1433 if (error) 1434 goto bad; 1435 *ap->a_vpp = DETOV(dep); 1436 return (0); 1437 1438bad: 1439 clusterfree(pmp, newcluster); 1440bad2: 1441 return (error); 1442} 1443 1444static int 1445msdosfs_rmdir(struct vop_rmdir_args *ap) 1446{ 1447 struct vnode *vp = ap->a_vp; 1448 struct vnode *dvp = ap->a_dvp; 1449 struct componentname *cnp = ap->a_cnp; 1450 struct denode *ip, *dp; 1451 int error; 1452 1453 ip = VTODE(vp); 1454 dp = VTODE(dvp); 1455 1456 /* 1457 * Verify the directory is empty (and valid). 1458 * (Rmdir ".." won't be valid since 1459 * ".." will contain a reference to 1460 * the current directory and thus be 1461 * non-empty.) 1462 */ 1463 error = 0; 1464 if (!dosdirempty(ip)) { 1465 error = ENOTEMPTY; 1466 goto out; 1467 } 1468 /* 1469 * Delete the entry from the directory. For dos filesystems this 1470 * gets rid of the directory entry on disk, the in memory copy 1471 * still exists but the de_refcnt is <= 0. This prevents it from 1472 * being found by deget(). When the vput() on dep is done we give 1473 * up access and eventually msdosfs_reclaim() will be called which 1474 * will remove it from the denode cache. 1475 */ 1476 error = removede(dp, ip); 1477 if (error) 1478 goto out; 1479 /* 1480 * This is where we decrement the link count in the parent 1481 * directory. Since dos filesystems don't do this we just purge 1482 * the name cache. 1483 */ 1484 cache_purge(dvp); 1485 /* 1486 * Truncate the directory that is being deleted. 1487 */ 1488 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1489 cache_purge(vp); 1490 1491out: 1492 return (error); 1493} 1494 1495/* 1496 * DOS filesystems don't know what symlinks are. 1497 */ 1498static int 1499msdosfs_symlink(struct vop_symlink_args *ap) 1500{ 1501 return (EOPNOTSUPP); 1502} 1503 1504static int 1505msdosfs_readdir(struct vop_readdir_args *ap) 1506{ 1507 struct mbnambuf nb; 1508 int error = 0; 1509 int diff; 1510 long n; 1511 int blsize; 1512 long on; 1513 u_long cn; 1514 u_long dirsperblk; 1515 long bias = 0; 1516 daddr_t bn, lbn; 1517 struct buf *bp; 1518 struct denode *dep = VTODE(ap->a_vp); 1519 struct msdosfsmount *pmp = dep->de_pmp; 1520 struct direntry *dentp; 1521 struct dirent dirbuf; 1522 struct uio *uio = ap->a_uio; 1523 uint64_t *cookies = NULL; 1524 int ncookies = 0; 1525 off_t offset, off; 1526 int chksum = -1; 1527 1528#ifdef MSDOSFS_DEBUG 1529 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1530 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1531#endif 1532 1533 /* 1534 * msdosfs_readdir() won't operate properly on regular files since 1535 * it does i/o only with the filesystem vnode, and hence can 1536 * retrieve the wrong block from the buffer cache for a plain file. 1537 * So, fail attempts to readdir() on a plain file. 1538 */ 1539 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1540 return (ENOTDIR); 1541 1542 /* 1543 * To be safe, initialize dirbuf 1544 */ 1545 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name)); 1546 1547 /* 1548 * If the user buffer is smaller than the size of one dos directory 1549 * entry or the file offset is not a multiple of the size of a 1550 * directory entry, then we fail the read. 1551 */ 1552 off = offset = uio->uio_offset; 1553 if (uio->uio_resid < sizeof(struct direntry) || 1554 (offset & (sizeof(struct direntry) - 1))) 1555 return (EINVAL); 1556 1557 if (ap->a_ncookies) { 1558 ncookies = uio->uio_resid / 16; 1559 cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, 1560 M_WAITOK); 1561 *ap->a_cookies = cookies; 1562 *ap->a_ncookies = ncookies; 1563 } 1564 1565 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1566 1567 /* 1568 * If they are reading from the root directory then, we simulate 1569 * the . and .. entries since these don't exist in the root 1570 * directory. We also set the offset bias to make up for having to 1571 * simulate these entries. By this I mean that at file offset 64 we 1572 * read the first entry in the root directory that lives on disk. 1573 */ 1574 if (dep->de_StartCluster == MSDOSFSROOT 1575 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1576#if 0 1577 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1578 offset); 1579#endif 1580 bias = 2 * sizeof(struct direntry); 1581 if (offset < bias) { 1582 for (n = (int)offset / sizeof(struct direntry); 1583 n < 2; n++) { 1584 dirbuf.d_fileno = FAT32(pmp) ? 1585 (uint64_t)cntobn(pmp, pmp->pm_rootdirblk) * 1586 dirsperblk : 1; 1587 dirbuf.d_type = DT_DIR; 1588 switch (n) { 1589 case 0: 1590 dirbuf.d_namlen = 1; 1591 dirbuf.d_name[0] = '.'; 1592 break; 1593 case 1: 1594 dirbuf.d_namlen = 2; 1595 dirbuf.d_name[0] = '.'; 1596 dirbuf.d_name[1] = '.'; 1597 break; 1598 } 1599 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1600 /* NOTE: d_off is the offset of the *next* entry. */ 1601 dirbuf.d_off = offset + sizeof(struct direntry); 1602 dirent_terminate(&dirbuf); 1603 if (uio->uio_resid < dirbuf.d_reclen) 1604 goto out; 1605 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1606 if (error) 1607 goto out; 1608 offset += sizeof(struct direntry); 1609 off = offset; 1610 if (cookies) { 1611 *cookies++ = offset; 1612 if (--ncookies <= 0) 1613 goto out; 1614 } 1615 } 1616 } 1617 } 1618 1619 mbnambuf_init(&nb); 1620 off = offset; 1621 while (uio->uio_resid > 0) { 1622 lbn = de_cluster(pmp, offset - bias); 1623 on = (offset - bias) & pmp->pm_crbomask; 1624 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1625 diff = dep->de_FileSize - (offset - bias); 1626 if (diff <= 0) 1627 break; 1628 n = min(n, diff); 1629 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1630 if (error) 1631 break; 1632 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1633 if (error) { 1634 return (error); 1635 } 1636 n = min(n, blsize - bp->b_resid); 1637 if (n == 0) { 1638 brelse(bp); 1639 return (EIO); 1640 } 1641 1642 /* 1643 * Convert from dos directory entries to fs-independent 1644 * directory entries. 1645 */ 1646 for (dentp = (struct direntry *)(bp->b_data + on); 1647 (char *)dentp < bp->b_data + on + n; 1648 dentp++, offset += sizeof(struct direntry)) { 1649#if 0 1650 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1651 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1652#endif 1653 /* 1654 * If this is an unused entry, we can stop. 1655 */ 1656 if (dentp->deName[0] == SLOT_EMPTY) { 1657 brelse(bp); 1658 goto out; 1659 } 1660 /* 1661 * Skip deleted entries. 1662 */ 1663 if (dentp->deName[0] == SLOT_DELETED) { 1664 chksum = -1; 1665 mbnambuf_init(&nb); 1666 continue; 1667 } 1668 1669 /* 1670 * Handle Win95 long directory entries 1671 */ 1672 if (dentp->deAttributes == ATTR_WIN95) { 1673 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1674 continue; 1675 chksum = win2unixfn(&nb, 1676 (struct winentry *)dentp, chksum, pmp); 1677 continue; 1678 } 1679 1680 /* 1681 * Skip volume labels 1682 */ 1683 if (dentp->deAttributes & ATTR_VOLUME) { 1684 chksum = -1; 1685 mbnambuf_init(&nb); 1686 continue; 1687 } 1688 /* 1689 * This computation of d_fileno must match 1690 * the computation of va_fileid in 1691 * msdosfs_getattr. 1692 */ 1693 if (dentp->deAttributes & ATTR_DIRECTORY) { 1694 cn = getushort(dentp->deStartCluster); 1695 if (FAT32(pmp)) { 1696 cn |= getushort(dentp->deHighClust) << 1697 16; 1698 if (cn == MSDOSFSROOT) 1699 cn = pmp->pm_rootdirblk; 1700 } 1701 if (cn == MSDOSFSROOT && !FAT32(pmp)) 1702 dirbuf.d_fileno = 1; 1703 else 1704 dirbuf.d_fileno = cntobn(pmp, cn) * 1705 dirsperblk; 1706 dirbuf.d_type = DT_DIR; 1707 } else { 1708 dirbuf.d_fileno = (uoff_t)offset / 1709 sizeof(struct direntry); 1710 dirbuf.d_type = DT_REG; 1711 } 1712 1713 if (chksum != winChksum(dentp->deName)) { 1714 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1715 (u_char *)dirbuf.d_name, 1716 dentp->deLowerCase | 1717 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1718 (LCASE_BASE | LCASE_EXT) : 0), 1719 pmp); 1720 mbnambuf_init(&nb); 1721 } else 1722 mbnambuf_flush(&nb, &dirbuf); 1723 chksum = -1; 1724 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1725 /* NOTE: d_off is the offset of the *next* entry. */ 1726 dirbuf.d_off = offset + sizeof(struct direntry); 1727 dirent_terminate(&dirbuf); 1728 if (uio->uio_resid < dirbuf.d_reclen) { 1729 brelse(bp); 1730 goto out; 1731 } 1732 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1733 if (error) { 1734 brelse(bp); 1735 goto out; 1736 } 1737 if (cookies) { 1738 *cookies++ = offset + sizeof(struct direntry); 1739 if (--ncookies <= 0) { 1740 brelse(bp); 1741 goto out; 1742 } 1743 } 1744 off = offset + sizeof(struct direntry); 1745 } 1746 brelse(bp); 1747 } 1748out: 1749 /* Subtract unused cookies */ 1750 if (ap->a_ncookies) 1751 *ap->a_ncookies -= ncookies; 1752 1753 uio->uio_offset = off; 1754 1755 /* 1756 * Set the eofflag (NFS uses it) 1757 */ 1758 if (ap->a_eofflag) { 1759 if (dep->de_FileSize - (offset - bias) <= 0) 1760 *ap->a_eofflag = 1; 1761 else 1762 *ap->a_eofflag = 0; 1763 } 1764 return (error); 1765} 1766 1767/*- 1768 * a_vp - pointer to the file's vnode 1769 * a_bn - logical block number within the file (cluster number for us) 1770 * a_bop - where to return the bufobj of the special file containing the fs 1771 * a_bnp - where to return the "physical" block number corresponding to a_bn 1772 * (relative to the special file; units are blocks of size DEV_BSIZE) 1773 * a_runp - where to return the "run past" a_bn. This is the count of logical 1774 * blocks whose physical blocks (together with a_bn's physical block) 1775 * are contiguous. 1776 * a_runb - where to return the "run before" a_bn. 1777 */ 1778static int 1779msdosfs_bmap(struct vop_bmap_args *ap) 1780{ 1781 struct fatcache savefc; 1782 struct denode *dep; 1783 struct mount *mp; 1784 struct msdosfsmount *pmp; 1785 struct vnode *vp; 1786 daddr_t runbn; 1787 u_long cn; 1788 int bnpercn, error, maxio, maxrun, run; 1789 1790 vp = ap->a_vp; 1791 dep = VTODE(vp); 1792 pmp = dep->de_pmp; 1793 if (ap->a_bop != NULL) 1794 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1795 if (ap->a_bnp == NULL) 1796 return (0); 1797 if (ap->a_runp != NULL) 1798 *ap->a_runp = 0; 1799 if (ap->a_runb != NULL) 1800 *ap->a_runb = 0; 1801 cn = ap->a_bn; 1802 if (cn != ap->a_bn) 1803 return (EFBIG); 1804 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1805 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1806 return (error); 1807 1808 /* 1809 * Prepare to back out updates of the fatchain cache after the one 1810 * for the first block done by pcbmap() above. Without the backout, 1811 * then whenever the caller doesn't do i/o to all of the blocks that 1812 * we find, the single useful cache entry would be too far in advance 1813 * of the actual i/o to work for the next sequential i/o. Then the 1814 * FAT would be searched from the beginning. With the backout, the 1815 * FAT is searched starting at most a few blocks early. This wastes 1816 * much less time. Time is also wasted finding more blocks than the 1817 * caller will do i/o to. This is necessary because the runlength 1818 * parameters are output-only. 1819 */ 1820 savefc = dep->de_fc[FC_LASTMAP]; 1821 1822 mp = vp->v_mount; 1823 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1824 bnpercn = de_cn2bn(pmp, 1); 1825 if (ap->a_runp != NULL) { 1826 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1827 for (run = 1; run <= maxrun; run++) { 1828 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1829 runbn != *ap->a_bnp + run * bnpercn) 1830 break; 1831 } 1832 *ap->a_runp = run - 1; 1833 } 1834 if (ap->a_runb != NULL) { 1835 maxrun = ulmin(maxio - 1, cn); 1836 for (run = 1; run < maxrun; run++) { 1837 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1838 runbn != *ap->a_bnp - run * bnpercn) 1839 break; 1840 } 1841 *ap->a_runb = run - 1; 1842 } 1843 dep->de_fc[FC_LASTMAP] = savefc; 1844 return (0); 1845} 1846 1847SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1848 "msdos filesystem"); 1849static int use_buf_pager = 1; 1850SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, 1851 &use_buf_pager, 0, 1852 "Use buffer pager instead of bmap"); 1853 1854static daddr_t 1855msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 1856{ 1857 1858 return (de_cluster(VTODE(vp)->de_pmp, off)); 1859} 1860 1861static int 1862msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz) 1863{ 1864 1865 *sz = VTODE(vp)->de_pmp->pm_bpcluster; 1866 return (0); 1867} 1868 1869static int 1870msdosfs_getpages(struct vop_getpages_args *ap) 1871{ 1872 1873 if (use_buf_pager) 1874 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count, 1875 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno, 1876 msdosfs_gbp_getblksz)); 1877 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count, 1878 ap->a_rbehind, ap->a_rahead, NULL, NULL)); 1879} 1880 1881static int 1882msdosfs_strategy(struct vop_strategy_args *ap) 1883{ 1884 struct buf *bp = ap->a_bp; 1885 struct denode *dep = VTODE(ap->a_vp); 1886 struct bufobj *bo; 1887 int error = 0; 1888 daddr_t blkno; 1889 1890 /* 1891 * If we don't already know the filesystem relative block number 1892 * then get it using pcbmap(). If pcbmap() returns the block 1893 * number as -1 then we've got a hole in the file. DOS filesystems 1894 * don't allow files with holes, so we shouldn't ever see this. 1895 */ 1896 if (bp->b_blkno == bp->b_lblkno) { 1897 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1898 bp->b_blkno = blkno; 1899 if (error) { 1900 bp->b_error = error; 1901 bp->b_ioflags |= BIO_ERROR; 1902 bufdone(bp); 1903 return (0); 1904 } 1905 if ((long)bp->b_blkno == -1) 1906 vfs_bio_clrbuf(bp); 1907 } 1908 if (bp->b_blkno == -1) { 1909 bufdone(bp); 1910 return (0); 1911 } 1912 /* 1913 * Read/write the block from/to the disk that contains the desired 1914 * file block. 1915 */ 1916 bp->b_iooffset = dbtob(bp->b_blkno); 1917 bo = dep->de_pmp->pm_bo; 1918 BO_STRATEGY(bo, bp); 1919 return (0); 1920} 1921 1922static int 1923msdosfs_print(struct vop_print_args *ap) 1924{ 1925 struct denode *dep = VTODE(ap->a_vp); 1926 1927 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1928 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1929 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1930 return (0); 1931} 1932 1933static int 1934msdosfs_pathconf(struct vop_pathconf_args *ap) 1935{ 1936 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1937 1938 switch (ap->a_name) { 1939 case _PC_FILESIZEBITS: 1940 *ap->a_retval = 32; 1941 return (0); 1942 case _PC_LINK_MAX: 1943 *ap->a_retval = 1; 1944 return (0); 1945 case _PC_NAME_MAX: 1946 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1947 return (0); 1948 case _PC_CHOWN_RESTRICTED: 1949 *ap->a_retval = 1; 1950 return (0); 1951 case _PC_NO_TRUNC: 1952 *ap->a_retval = 0; 1953 return (0); 1954 default: 1955 return (vop_stdpathconf(ap)); 1956 } 1957 /* NOTREACHED */ 1958} 1959 1960static int 1961msdosfs_vptofh(struct vop_vptofh_args *ap) 1962{ 1963 struct denode *dep; 1964 struct defid *defhp; 1965 1966 dep = VTODE(ap->a_vp); 1967 defhp = (struct defid *)ap->a_fhp; 1968 defhp->defid_len = sizeof(struct defid); 1969 defhp->defid_dirclust = dep->de_dirclust; 1970 defhp->defid_dirofs = dep->de_diroffset; 1971 /* defhp->defid_gen = dep->de_gen; */ 1972 return (0); 1973} 1974 1975/* Global vfs data structures for msdosfs */ 1976struct vop_vector msdosfs_vnodeops = { 1977 .vop_default = &default_vnodeops, 1978 1979 .vop_access = msdosfs_access, 1980 .vop_bmap = msdosfs_bmap, 1981 .vop_getpages = msdosfs_getpages, 1982 .vop_cachedlookup = msdosfs_lookup, 1983 .vop_open = msdosfs_open, 1984 .vop_close = msdosfs_close, 1985 .vop_create = msdosfs_create, 1986 .vop_fsync = msdosfs_fsync, 1987 .vop_fdatasync = vop_stdfdatasync_buf, 1988 .vop_getattr = msdosfs_getattr, 1989 .vop_inactive = msdosfs_inactive, 1990 .vop_link = msdosfs_link, 1991 .vop_lookup = vfs_cache_lookup, 1992 .vop_mkdir = msdosfs_mkdir, 1993 .vop_mknod = msdosfs_mknod, 1994 .vop_pathconf = msdosfs_pathconf, 1995 .vop_print = msdosfs_print, 1996 .vop_read = msdosfs_read, 1997 .vop_readdir = msdosfs_readdir, 1998 .vop_reclaim = msdosfs_reclaim, 1999 .vop_remove = msdosfs_remove, 2000 .vop_rename = msdosfs_rename, 2001 .vop_rmdir = msdosfs_rmdir, 2002 .vop_setattr = msdosfs_setattr, 2003 .vop_strategy = msdosfs_strategy, 2004 .vop_symlink = msdosfs_symlink, 2005 .vop_write = msdosfs_write, 2006 .vop_vptofh = msdosfs_vptofh, 2007}; 2008VFS_VOP_VECTOR_REGISTER(msdosfs_vnodeops); 2009