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 */ 84 static vop_create_t msdosfs_create; 85 static vop_mknod_t msdosfs_mknod; 86 static vop_open_t msdosfs_open; 87 static vop_close_t msdosfs_close; 88 static vop_access_t msdosfs_access; 89 static vop_getattr_t msdosfs_getattr; 90 static vop_setattr_t msdosfs_setattr; 91 static vop_read_t msdosfs_read; 92 static vop_write_t msdosfs_write; 93 static vop_fsync_t msdosfs_fsync; 94 static vop_remove_t msdosfs_remove; 95 static vop_link_t msdosfs_link; 96 static vop_rename_t msdosfs_rename; 97 static vop_mkdir_t msdosfs_mkdir; 98 static vop_rmdir_t msdosfs_rmdir; 99 static vop_symlink_t msdosfs_symlink; 100 static vop_readdir_t msdosfs_readdir; 101 static vop_bmap_t msdosfs_bmap; 102 static vop_getpages_t msdosfs_getpages; 103 static vop_strategy_t msdosfs_strategy; 104 static vop_print_t msdosfs_print; 105 static vop_pathconf_t msdosfs_pathconf; 106 static 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 */ 131 static int 132 msdosfs_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); 182 183 bad: 184 return (error); 185 } 186 187 static int 188 msdosfs_mknod(struct vop_mknod_args *ap) 189 { 190 191 return (EINVAL); 192 } 193 194 static int 195 msdosfs_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 } 201 202 static int 203 msdosfs_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 } 217 218 static int 219 msdosfs_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 } 249 250 static int 251 msdosfs_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 } 324 325 static int 326 msdosfs_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 } 517 518 static int 519 msdosfs_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 */ 613 static int 614 msdosfs_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 */ 814 errexit: 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 */ 834 static int 835 msdosfs_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 } 867 868 static int 869 msdosfs_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 */ 888 static int 889 msdosfs_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 */ 940 static int 941 msdosfs_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; 990 991 relock: 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 MPASS(error == EJUSTRETURN); 1184 error = createde(fip, tdip, NULL, tcnp); 1185 if (error != 0) { 1186 memcpy(fip->de_Name, oldname, 11); 1187 goto unlock; 1188 } 1189 1190 /* 1191 * If fip is for a directory, then its name should always 1192 * be "." since it is for the directory entry in the 1193 * directory itself (msdosfs_lookup() always translates 1194 * to the "." entry so as to get a unique denode, except 1195 * for the root directory there are different 1196 * complications). However, we just corrupted its name 1197 * to pass the correct name to createde(). Undo this. 1198 */ 1199 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) 1200 memcpy(fip->de_Name, oldname, 11); 1201 fip->de_refcnt++; 1202 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1203 MPASS(error == 0); 1204 error = removede(fdip, fip); 1205 if (error != 0) { 1206 /* XXX should downgrade to ro here, fs is corrupt */ 1207 goto unlock; 1208 } 1209 if (!doingdirectory) { 1210 error = pcbmap(tdip, de_cluster(pmp, to_diroffset), 0, 1211 &fip->de_dirclust, 0); 1212 if (error != 0) { 1213 /* 1214 * XXX should downgrade to ro here, 1215 * fs is corrupt 1216 */ 1217 goto unlock; 1218 } 1219 if (fip->de_dirclust == MSDOSFSROOT) 1220 fip->de_diroffset = to_diroffset; 1221 else 1222 fip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1223 } 1224 reinsert(fip); 1225 1226 /* 1227 * If we moved a directory to a new parent directory, then we must 1228 * fixup the ".." entry in the moved directory. 1229 */ 1230 if (doingdirectory && newparent) { 1231 cn = fip->de_StartCluster; 1232 if (cn == MSDOSFSROOT) { 1233 /* this should never happen */ 1234 panic("msdosfs_rename(): updating .. in root directory?"); 1235 } else 1236 bn = cntobn(pmp, cn); 1237 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1238 NOCRED, &bp); 1239 if (error != 0) { 1240 /* XXX should downgrade to ro here, fs is corrupt */ 1241 goto unlock; 1242 } 1243 dotdotp = (struct direntry *)bp->b_data + 1; 1244 pcl = tdip->de_StartCluster; 1245 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1246 pcl = MSDOSFSROOT; 1247 putushort(dotdotp->deStartCluster, pcl); 1248 if (FAT32(pmp)) 1249 putushort(dotdotp->deHighClust, pcl >> 16); 1250 if (DOINGASYNC(fvp)) 1251 bdwrite(bp); 1252 else if ((error = bwrite(bp)) != 0) { 1253 /* XXX should downgrade to ro here, fs is corrupt */ 1254 goto unlock; 1255 } 1256 } 1257 1258 /* 1259 * The msdosfs lookup is case insensitive. Several aliases may 1260 * be inserted for a single directory entry. As a consequnce, 1261 * name cache purge done by lookup for fvp when DELETE op for 1262 * namei is specified, might be not enough to expunge all 1263 * namecache entries that were installed for this direntry. 1264 */ 1265 cache_purge(fvp); 1266 1267 unlock: 1268 if (checkpath_locked) 1269 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1270 vput(fdvp); 1271 vput(fvp); 1272 if (tvp != NULL) { 1273 if (tvp != tdvp) 1274 vput(tvp); 1275 else 1276 vrele(tvp); 1277 } 1278 vput(tdvp); 1279 return (error); 1280 releout: 1281 MPASS(!checkpath_locked); 1282 vrele(tdvp); 1283 if (tvp != NULL) 1284 vrele(tvp); 1285 vrele(fdvp); 1286 vrele(fvp); 1287 return (error); 1288 abortit: 1289 if (tdvp == tvp) 1290 vrele(tdvp); 1291 else 1292 vput(tdvp); 1293 if (tvp != NULL) 1294 vput(tvp); 1295 vrele(fdvp); 1296 vrele(fvp); 1297 return (error); 1298 } 1299 1300 static struct { 1301 struct direntry dot; 1302 struct direntry dotdot; 1303 } dosdirtemplate = { 1304 { ". ", /* the . entry */ 1305 ATTR_DIRECTORY, /* file attribute */ 1306 0, /* reserved */ 1307 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1308 { 0, 0 }, /* access date */ 1309 { 0, 0 }, /* high bits of start cluster */ 1310 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1311 { 0, 0 }, /* startcluster */ 1312 { 0, 0, 0, 0 } /* filesize */ 1313 }, 1314 { ".. ", /* the .. entry */ 1315 ATTR_DIRECTORY, /* file attribute */ 1316 0, /* reserved */ 1317 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1318 { 0, 0 }, /* access date */ 1319 { 0, 0 }, /* high bits of start cluster */ 1320 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1321 { 0, 0 }, /* startcluster */ 1322 { 0, 0, 0, 0 } /* filesize */ 1323 } 1324 }; 1325 1326 static int 1327 msdosfs_mkdir(struct vop_mkdir_args *ap) 1328 { 1329 struct componentname *cnp = ap->a_cnp; 1330 struct denode *dep; 1331 struct denode *pdep = VTODE(ap->a_dvp); 1332 struct direntry *denp; 1333 struct msdosfsmount *pmp = pdep->de_pmp; 1334 struct buf *bp; 1335 u_long newcluster, pcl; 1336 int bn; 1337 int error; 1338 struct denode ndirent; 1339 struct timespec ts; 1340 1341 /* 1342 * If this is the root directory and there is no space left we 1343 * can't do anything. This is because the root directory can not 1344 * change size. 1345 */ 1346 if (pdep->de_StartCluster == MSDOSFSROOT 1347 && pdep->de_fndoffset >= pdep->de_FileSize) { 1348 error = ENOSPC; 1349 goto bad2; 1350 } 1351 1352 /* 1353 * Allocate a cluster to hold the about to be created directory. 1354 */ 1355 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1356 if (error) 1357 goto bad2; 1358 1359 memset(&ndirent, 0, sizeof(ndirent)); 1360 ndirent.de_pmp = pmp; 1361 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1362 vfs_timestamp(&ts); 1363 DETIMES(&ndirent, &ts, &ts, &ts); 1364 1365 /* 1366 * Now fill the cluster with the "." and ".." entries. And write 1367 * the cluster to disk. This way it is there for the parent 1368 * directory to be pointing at if there were a crash. 1369 */ 1370 bn = cntobn(pmp, newcluster); 1371 /* always succeeds */ 1372 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1373 memset(bp->b_data, 0, pmp->pm_bpcluster); 1374 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1375 denp = (struct direntry *)bp->b_data; 1376 putushort(denp[0].deStartCluster, newcluster); 1377 putushort(denp[0].deCDate, ndirent.de_CDate); 1378 putushort(denp[0].deCTime, ndirent.de_CTime); 1379 denp[0].deCHundredth = ndirent.de_CHun; 1380 putushort(denp[0].deADate, ndirent.de_ADate); 1381 putushort(denp[0].deMDate, ndirent.de_MDate); 1382 putushort(denp[0].deMTime, ndirent.de_MTime); 1383 pcl = pdep->de_StartCluster; 1384 /* 1385 * Although the root directory has a non-magic starting cluster 1386 * number for FAT32, chkdsk and fsck_msdosfs still require 1387 * references to it in dotdot entries to be magic. 1388 */ 1389 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1390 pcl = MSDOSFSROOT; 1391 putushort(denp[1].deStartCluster, pcl); 1392 putushort(denp[1].deCDate, ndirent.de_CDate); 1393 putushort(denp[1].deCTime, ndirent.de_CTime); 1394 denp[1].deCHundredth = ndirent.de_CHun; 1395 putushort(denp[1].deADate, ndirent.de_ADate); 1396 putushort(denp[1].deMDate, ndirent.de_MDate); 1397 putushort(denp[1].deMTime, ndirent.de_MTime); 1398 if (FAT32(pmp)) { 1399 putushort(denp[0].deHighClust, newcluster >> 16); 1400 putushort(denp[1].deHighClust, pcl >> 16); 1401 } 1402 1403 if (DOINGASYNC(ap->a_dvp)) 1404 bdwrite(bp); 1405 else if ((error = bwrite(bp)) != 0) 1406 goto bad; 1407 1408 /* 1409 * Now build up a directory entry pointing to the newly allocated 1410 * cluster. This will be written to an empty slot in the parent 1411 * directory. 1412 */ 1413 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1414 if (error) 1415 goto bad; 1416 1417 ndirent.de_Attributes = ATTR_DIRECTORY; 1418 ndirent.de_LowerCase = 0; 1419 ndirent.de_StartCluster = newcluster; 1420 ndirent.de_FileSize = 0; 1421 error = createde(&ndirent, pdep, &dep, cnp); 1422 if (error) 1423 goto bad; 1424 *ap->a_vpp = DETOV(dep); 1425 return (0); 1426 1427 bad: 1428 clusterfree(pmp, newcluster); 1429 bad2: 1430 return (error); 1431 } 1432 1433 static int 1434 msdosfs_rmdir(struct vop_rmdir_args *ap) 1435 { 1436 struct vnode *vp = ap->a_vp; 1437 struct vnode *dvp = ap->a_dvp; 1438 struct componentname *cnp = ap->a_cnp; 1439 struct denode *ip, *dp; 1440 int error; 1441 1442 ip = VTODE(vp); 1443 dp = VTODE(dvp); 1444 1445 /* 1446 * Verify the directory is empty (and valid). 1447 * (Rmdir ".." won't be valid since 1448 * ".." will contain a reference to 1449 * the current directory and thus be 1450 * non-empty.) 1451 */ 1452 error = 0; 1453 if (!dosdirempty(ip)) { 1454 error = ENOTEMPTY; 1455 goto out; 1456 } 1457 /* 1458 * Delete the entry from the directory. For dos filesystems this 1459 * gets rid of the directory entry on disk, the in memory copy 1460 * still exists but the de_refcnt is <= 0. This prevents it from 1461 * being found by deget(). When the vput() on dep is done we give 1462 * up access and eventually msdosfs_reclaim() will be called which 1463 * will remove it from the denode cache. 1464 */ 1465 error = removede(dp, ip); 1466 if (error) 1467 goto out; 1468 /* 1469 * This is where we decrement the link count in the parent 1470 * directory. Since dos filesystems don't do this we just purge 1471 * the name cache. 1472 */ 1473 cache_purge(dvp); 1474 /* 1475 * Truncate the directory that is being deleted. 1476 */ 1477 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1478 cache_purge(vp); 1479 1480 out: 1481 return (error); 1482 } 1483 1484 /* 1485 * DOS filesystems don't know what symlinks are. 1486 */ 1487 static int 1488 msdosfs_symlink(struct vop_symlink_args *ap) 1489 { 1490 return (EOPNOTSUPP); 1491 } 1492 1493 static int 1494 msdosfs_readdir(struct vop_readdir_args *ap) 1495 { 1496 struct mbnambuf nb; 1497 int error = 0; 1498 int diff; 1499 long n; 1500 int blsize; 1501 long on; 1502 u_long cn; 1503 u_long dirsperblk; 1504 long bias = 0; 1505 daddr_t bn, lbn; 1506 struct buf *bp; 1507 struct denode *dep = VTODE(ap->a_vp); 1508 struct msdosfsmount *pmp = dep->de_pmp; 1509 struct direntry *dentp; 1510 struct dirent dirbuf; 1511 struct uio *uio = ap->a_uio; 1512 uint64_t *cookies = NULL; 1513 int ncookies = 0; 1514 off_t offset, off; 1515 int chksum = -1; 1516 1517 #ifdef MSDOSFS_DEBUG 1518 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1519 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1520 #endif 1521 1522 /* 1523 * msdosfs_readdir() won't operate properly on regular files since 1524 * it does i/o only with the filesystem vnode, and hence can 1525 * retrieve the wrong block from the buffer cache for a plain file. 1526 * So, fail attempts to readdir() on a plain file. 1527 */ 1528 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1529 return (ENOTDIR); 1530 1531 /* 1532 * To be safe, initialize dirbuf 1533 */ 1534 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name)); 1535 1536 /* 1537 * If the user buffer is smaller than the size of one dos directory 1538 * entry or the file offset is not a multiple of the size of a 1539 * directory entry, then we fail the read. 1540 */ 1541 off = offset = uio->uio_offset; 1542 if (uio->uio_resid < sizeof(struct direntry) || 1543 (offset & (sizeof(struct direntry) - 1))) 1544 return (EINVAL); 1545 1546 if (ap->a_ncookies) { 1547 ncookies = uio->uio_resid / 16; 1548 cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, 1549 M_WAITOK); 1550 *ap->a_cookies = cookies; 1551 *ap->a_ncookies = ncookies; 1552 } 1553 1554 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1555 1556 /* 1557 * If they are reading from the root directory then, we simulate 1558 * the . and .. entries since these don't exist in the root 1559 * directory. We also set the offset bias to make up for having to 1560 * simulate these entries. By this I mean that at file offset 64 we 1561 * read the first entry in the root directory that lives on disk. 1562 */ 1563 if (dep->de_StartCluster == MSDOSFSROOT 1564 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1565 #if 0 1566 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1567 offset); 1568 #endif 1569 bias = 2 * sizeof(struct direntry); 1570 if (offset < bias) { 1571 for (n = (int)offset / sizeof(struct direntry); 1572 n < 2; n++) { 1573 dirbuf.d_fileno = FAT32(pmp) ? 1574 (uint64_t)cntobn(pmp, pmp->pm_rootdirblk) * 1575 dirsperblk : 1; 1576 dirbuf.d_type = DT_DIR; 1577 switch (n) { 1578 case 0: 1579 dirbuf.d_namlen = 1; 1580 dirbuf.d_name[0] = '.'; 1581 break; 1582 case 1: 1583 dirbuf.d_namlen = 2; 1584 dirbuf.d_name[0] = '.'; 1585 dirbuf.d_name[1] = '.'; 1586 break; 1587 } 1588 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1589 /* NOTE: d_off is the offset of the *next* entry. */ 1590 dirbuf.d_off = offset + sizeof(struct direntry); 1591 dirent_terminate(&dirbuf); 1592 if (uio->uio_resid < dirbuf.d_reclen) 1593 goto out; 1594 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1595 if (error) 1596 goto out; 1597 offset += sizeof(struct direntry); 1598 off = offset; 1599 if (cookies) { 1600 *cookies++ = offset; 1601 if (--ncookies <= 0) 1602 goto out; 1603 } 1604 } 1605 } 1606 } 1607 1608 mbnambuf_init(&nb); 1609 off = offset; 1610 while (uio->uio_resid > 0) { 1611 lbn = de_cluster(pmp, offset - bias); 1612 on = (offset - bias) & pmp->pm_crbomask; 1613 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1614 diff = dep->de_FileSize - (offset - bias); 1615 if (diff <= 0) 1616 break; 1617 n = min(n, diff); 1618 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1619 if (error) 1620 break; 1621 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1622 if (error) { 1623 return (error); 1624 } 1625 n = min(n, blsize - bp->b_resid); 1626 if (n == 0) { 1627 brelse(bp); 1628 return (EIO); 1629 } 1630 1631 /* 1632 * Convert from dos directory entries to fs-independent 1633 * directory entries. 1634 */ 1635 for (dentp = (struct direntry *)(bp->b_data + on); 1636 (char *)dentp < bp->b_data + on + n; 1637 dentp++, offset += sizeof(struct direntry)) { 1638 #if 0 1639 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1640 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1641 #endif 1642 /* 1643 * If this is an unused entry, we can stop. 1644 */ 1645 if (dentp->deName[0] == SLOT_EMPTY) { 1646 brelse(bp); 1647 goto out; 1648 } 1649 /* 1650 * Skip deleted entries. 1651 */ 1652 if (dentp->deName[0] == SLOT_DELETED) { 1653 chksum = -1; 1654 mbnambuf_init(&nb); 1655 continue; 1656 } 1657 1658 /* 1659 * Handle Win95 long directory entries 1660 */ 1661 if (dentp->deAttributes == ATTR_WIN95) { 1662 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1663 continue; 1664 chksum = win2unixfn(&nb, 1665 (struct winentry *)dentp, chksum, pmp); 1666 continue; 1667 } 1668 1669 /* 1670 * Skip volume labels 1671 */ 1672 if (dentp->deAttributes & ATTR_VOLUME) { 1673 chksum = -1; 1674 mbnambuf_init(&nb); 1675 continue; 1676 } 1677 /* 1678 * This computation of d_fileno must match 1679 * the computation of va_fileid in 1680 * msdosfs_getattr. 1681 */ 1682 if (dentp->deAttributes & ATTR_DIRECTORY) { 1683 cn = getushort(dentp->deStartCluster); 1684 if (FAT32(pmp)) { 1685 cn |= getushort(dentp->deHighClust) << 1686 16; 1687 if (cn == MSDOSFSROOT) 1688 cn = pmp->pm_rootdirblk; 1689 } 1690 if (cn == MSDOSFSROOT && !FAT32(pmp)) 1691 dirbuf.d_fileno = 1; 1692 else 1693 dirbuf.d_fileno = cntobn(pmp, cn) * 1694 dirsperblk; 1695 dirbuf.d_type = DT_DIR; 1696 } else { 1697 dirbuf.d_fileno = (uoff_t)offset / 1698 sizeof(struct direntry); 1699 dirbuf.d_type = DT_REG; 1700 } 1701 1702 if (chksum != winChksum(dentp->deName)) { 1703 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1704 (u_char *)dirbuf.d_name, 1705 dentp->deLowerCase | 1706 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1707 (LCASE_BASE | LCASE_EXT) : 0), 1708 pmp); 1709 mbnambuf_init(&nb); 1710 } else 1711 mbnambuf_flush(&nb, &dirbuf); 1712 chksum = -1; 1713 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1714 /* NOTE: d_off is the offset of the *next* entry. */ 1715 dirbuf.d_off = offset + sizeof(struct direntry); 1716 dirent_terminate(&dirbuf); 1717 if (uio->uio_resid < dirbuf.d_reclen) { 1718 brelse(bp); 1719 goto out; 1720 } 1721 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1722 if (error) { 1723 brelse(bp); 1724 goto out; 1725 } 1726 if (cookies) { 1727 *cookies++ = offset + sizeof(struct direntry); 1728 if (--ncookies <= 0) { 1729 brelse(bp); 1730 goto out; 1731 } 1732 } 1733 off = offset + sizeof(struct direntry); 1734 } 1735 brelse(bp); 1736 } 1737 out: 1738 /* Subtract unused cookies */ 1739 if (ap->a_ncookies) 1740 *ap->a_ncookies -= ncookies; 1741 1742 uio->uio_offset = off; 1743 1744 /* 1745 * Set the eofflag (NFS uses it) 1746 */ 1747 if (ap->a_eofflag) { 1748 if (dep->de_FileSize - (offset - bias) <= 0) 1749 *ap->a_eofflag = 1; 1750 else 1751 *ap->a_eofflag = 0; 1752 } 1753 return (error); 1754 } 1755 1756 /*- 1757 * a_vp - pointer to the file's vnode 1758 * a_bn - logical block number within the file (cluster number for us) 1759 * a_bop - where to return the bufobj of the special file containing the fs 1760 * a_bnp - where to return the "physical" block number corresponding to a_bn 1761 * (relative to the special file; units are blocks of size DEV_BSIZE) 1762 * a_runp - where to return the "run past" a_bn. This is the count of logical 1763 * blocks whose physical blocks (together with a_bn's physical block) 1764 * are contiguous. 1765 * a_runb - where to return the "run before" a_bn. 1766 */ 1767 static int 1768 msdosfs_bmap(struct vop_bmap_args *ap) 1769 { 1770 struct fatcache savefc; 1771 struct denode *dep; 1772 struct mount *mp; 1773 struct msdosfsmount *pmp; 1774 struct vnode *vp; 1775 daddr_t runbn; 1776 u_long cn; 1777 int bnpercn, error, maxio, maxrun, run; 1778 1779 vp = ap->a_vp; 1780 dep = VTODE(vp); 1781 pmp = dep->de_pmp; 1782 if (ap->a_bop != NULL) 1783 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1784 if (ap->a_bnp == NULL) 1785 return (0); 1786 if (ap->a_runp != NULL) 1787 *ap->a_runp = 0; 1788 if (ap->a_runb != NULL) 1789 *ap->a_runb = 0; 1790 cn = ap->a_bn; 1791 if (cn != ap->a_bn) 1792 return (EFBIG); 1793 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1794 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1795 return (error); 1796 1797 /* 1798 * Prepare to back out updates of the fatchain cache after the one 1799 * for the first block done by pcbmap() above. Without the backout, 1800 * then whenever the caller doesn't do i/o to all of the blocks that 1801 * we find, the single useful cache entry would be too far in advance 1802 * of the actual i/o to work for the next sequential i/o. Then the 1803 * FAT would be searched from the beginning. With the backout, the 1804 * FAT is searched starting at most a few blocks early. This wastes 1805 * much less time. Time is also wasted finding more blocks than the 1806 * caller will do i/o to. This is necessary because the runlength 1807 * parameters are output-only. 1808 */ 1809 savefc = dep->de_fc[FC_LASTMAP]; 1810 1811 mp = vp->v_mount; 1812 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1813 bnpercn = de_cn2bn(pmp, 1); 1814 if (ap->a_runp != NULL) { 1815 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1816 for (run = 1; run <= maxrun; run++) { 1817 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1818 runbn != *ap->a_bnp + run * bnpercn) 1819 break; 1820 } 1821 *ap->a_runp = run - 1; 1822 } 1823 if (ap->a_runb != NULL) { 1824 maxrun = ulmin(maxio - 1, cn); 1825 for (run = 1; run < maxrun; run++) { 1826 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1827 runbn != *ap->a_bnp - run * bnpercn) 1828 break; 1829 } 1830 *ap->a_runb = run - 1; 1831 } 1832 dep->de_fc[FC_LASTMAP] = savefc; 1833 return (0); 1834 } 1835 1836 SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1837 "msdos filesystem"); 1838 static int use_buf_pager = 1; 1839 SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, 1840 &use_buf_pager, 0, 1841 "Use buffer pager instead of bmap"); 1842 1843 static daddr_t 1844 msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 1845 { 1846 1847 return (de_cluster(VTODE(vp)->de_pmp, off)); 1848 } 1849 1850 static int 1851 msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz) 1852 { 1853 1854 *sz = VTODE(vp)->de_pmp->pm_bpcluster; 1855 return (0); 1856 } 1857 1858 static int 1859 msdosfs_getpages(struct vop_getpages_args *ap) 1860 { 1861 1862 if (use_buf_pager) 1863 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count, 1864 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno, 1865 msdosfs_gbp_getblksz)); 1866 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count, 1867 ap->a_rbehind, ap->a_rahead, NULL, NULL)); 1868 } 1869 1870 static int 1871 msdosfs_strategy(struct vop_strategy_args *ap) 1872 { 1873 struct buf *bp = ap->a_bp; 1874 struct denode *dep = VTODE(ap->a_vp); 1875 struct bufobj *bo; 1876 int error = 0; 1877 daddr_t blkno; 1878 1879 /* 1880 * If we don't already know the filesystem relative block number 1881 * then get it using pcbmap(). If pcbmap() returns the block 1882 * number as -1 then we've got a hole in the file. DOS filesystems 1883 * don't allow files with holes, so we shouldn't ever see this. 1884 */ 1885 if (bp->b_blkno == bp->b_lblkno) { 1886 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1887 bp->b_blkno = blkno; 1888 if (error) { 1889 bp->b_error = error; 1890 bp->b_ioflags |= BIO_ERROR; 1891 bufdone(bp); 1892 return (0); 1893 } 1894 if ((long)bp->b_blkno == -1) 1895 vfs_bio_clrbuf(bp); 1896 } 1897 if (bp->b_blkno == -1) { 1898 bufdone(bp); 1899 return (0); 1900 } 1901 /* 1902 * Read/write the block from/to the disk that contains the desired 1903 * file block. 1904 */ 1905 bp->b_iooffset = dbtob(bp->b_blkno); 1906 bo = dep->de_pmp->pm_bo; 1907 BO_STRATEGY(bo, bp); 1908 return (0); 1909 } 1910 1911 static int 1912 msdosfs_print(struct vop_print_args *ap) 1913 { 1914 struct denode *dep = VTODE(ap->a_vp); 1915 1916 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1917 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1918 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1919 return (0); 1920 } 1921 1922 static int 1923 msdosfs_pathconf(struct vop_pathconf_args *ap) 1924 { 1925 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1926 1927 switch (ap->a_name) { 1928 case _PC_FILESIZEBITS: 1929 *ap->a_retval = 32; 1930 return (0); 1931 case _PC_LINK_MAX: 1932 *ap->a_retval = 1; 1933 return (0); 1934 case _PC_NAME_MAX: 1935 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1936 return (0); 1937 case _PC_CHOWN_RESTRICTED: 1938 *ap->a_retval = 1; 1939 return (0); 1940 case _PC_NO_TRUNC: 1941 *ap->a_retval = 0; 1942 return (0); 1943 default: 1944 return (vop_stdpathconf(ap)); 1945 } 1946 /* NOTREACHED */ 1947 } 1948 1949 static int 1950 msdosfs_vptofh(struct vop_vptofh_args *ap) 1951 { 1952 struct denode *dep; 1953 struct defid *defhp; 1954 1955 dep = VTODE(ap->a_vp); 1956 defhp = (struct defid *)ap->a_fhp; 1957 defhp->defid_len = sizeof(struct defid); 1958 defhp->defid_dirclust = dep->de_dirclust; 1959 defhp->defid_dirofs = dep->de_diroffset; 1960 /* defhp->defid_gen = dep->de_gen; */ 1961 return (0); 1962 } 1963 1964 /* Global vfs data structures for msdosfs */ 1965 struct vop_vector msdosfs_vnodeops = { 1966 .vop_default = &default_vnodeops, 1967 1968 .vop_access = msdosfs_access, 1969 .vop_bmap = msdosfs_bmap, 1970 .vop_getpages = msdosfs_getpages, 1971 .vop_cachedlookup = msdosfs_lookup, 1972 .vop_open = msdosfs_open, 1973 .vop_close = msdosfs_close, 1974 .vop_create = msdosfs_create, 1975 .vop_fsync = msdosfs_fsync, 1976 .vop_fdatasync = vop_stdfdatasync_buf, 1977 .vop_getattr = msdosfs_getattr, 1978 .vop_inactive = msdosfs_inactive, 1979 .vop_link = msdosfs_link, 1980 .vop_lookup = vfs_cache_lookup, 1981 .vop_mkdir = msdosfs_mkdir, 1982 .vop_mknod = msdosfs_mknod, 1983 .vop_pathconf = msdosfs_pathconf, 1984 .vop_print = msdosfs_print, 1985 .vop_read = msdosfs_read, 1986 .vop_readdir = msdosfs_readdir, 1987 .vop_reclaim = msdosfs_reclaim, 1988 .vop_remove = msdosfs_remove, 1989 .vop_rename = msdosfs_rename, 1990 .vop_rmdir = msdosfs_rmdir, 1991 .vop_setattr = msdosfs_setattr, 1992 .vop_strategy = msdosfs_strategy, 1993 .vop_symlink = msdosfs_symlink, 1994 .vop_write = msdosfs_write, 1995 .vop_vptofh = msdosfs_vptofh, 1996 }; 1997 VFS_VOP_VECTOR_REGISTER(msdosfs_vnodeops); 1998