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sys/fs/msdosfs/msdosfs_vnops.c
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1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-4-Clause 6 * 7 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 8 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 9 * All rights reserved. 10 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by TooLs GmbH. 23 * 4. The name of TooLs GmbH may not be used to endorse or promote products 24 * derived from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 32 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 33 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 34 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 35 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 /*- 38 * Written by Paul Popelka (paulp@uts.amdahl.com) 39 * 40 * You can do anything you want with this software, just don't say you wrote 41 * it, and don't remove this notice. 42 * 43 * This software is provided "as is". 44 * 45 * The author supplies this software to be publicly redistributed on the 46 * understanding that the author is not responsible for the correct 47 * functioning of this software in any circumstances and is not liable for 48 * any damages caused by this software. 49 * 50 * October 1992 51 */ 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/bio.h> 56 #include <sys/buf.h> 57 #include <sys/clock.h> 58 #include <sys/dirent.h> 59 #include <sys/lock.h> 60 #include <sys/lockf.h> 61 #include <sys/malloc.h> 62 #include <sys/mount.h> 63 #include <sys/mutex.h> 64 #include <sys/namei.h> 65 #include <sys/priv.h> 66 #include <sys/stat.h> 67 #include <sys/sysctl.h> 68 #include <sys/unistd.h> 69 #include <sys/vmmeter.h> 70 #include <sys/vnode.h> 71 72 #include <vm/vm.h> 73 #include <vm/vm_extern.h> 74 #include <vm/vnode_pager.h> 75 76 #include <fs/msdosfs/bpb.h> 77 #include <fs/msdosfs/direntry.h> 78 #include <fs/msdosfs/denode.h> 79 #include <fs/msdosfs/fat.h> 80 #include <fs/msdosfs/msdosfsmount.h> 81 82 /* 83 * Prototypes for MSDOSFS vnode operations 84 */ 85 static vop_create_t msdosfs_create; 86 static vop_mknod_t msdosfs_mknod; 87 static vop_open_t msdosfs_open; 88 static vop_close_t msdosfs_close; 89 static vop_access_t msdosfs_access; 90 static vop_getattr_t msdosfs_getattr; 91 static vop_setattr_t msdosfs_setattr; 92 static vop_read_t msdosfs_read; 93 static vop_write_t msdosfs_write; 94 static vop_fsync_t msdosfs_fsync; 95 static vop_remove_t msdosfs_remove; 96 static vop_link_t msdosfs_link; 97 static vop_rename_t msdosfs_rename; 98 static vop_mkdir_t msdosfs_mkdir; 99 static vop_rmdir_t msdosfs_rmdir; 100 static vop_symlink_t msdosfs_symlink; 101 static vop_readdir_t msdosfs_readdir; 102 static vop_bmap_t msdosfs_bmap; 103 static vop_getpages_t msdosfs_getpages; 104 static vop_strategy_t msdosfs_strategy; 105 static vop_print_t msdosfs_print; 106 static vop_pathconf_t msdosfs_pathconf; 107 static vop_vptofh_t msdosfs_vptofh; 108 109 /* 110 * Some general notes: 111 * 112 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 113 * read/written using the vnode for the filesystem. Blocks that represent 114 * the contents of a file are read/written using the vnode for the file 115 * (including directories when they are read/written as files). This 116 * presents problems for the dos filesystem because data that should be in 117 * an inode (if dos had them) resides in the directory itself. Since we 118 * must update directory entries without the benefit of having the vnode 119 * for the directory we must use the vnode for the filesystem. This means 120 * that when a directory is actually read/written (via read, write, or 121 * readdir, or seek) we must use the vnode for the filesystem instead of 122 * the vnode for the directory as would happen in ufs. This is to insure we 123 * retrieve the correct block from the buffer cache since the hash value is 124 * based upon the vnode address and the desired block number. 125 */ 126 127 /* 128 * Create a regular file. On entry the directory to contain the file being 129 * created is locked. We must release before we return. We must also free 130 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error. 131 */ 132 static int 133 msdosfs_create(struct vop_create_args *ap) 134 { 135 struct componentname *cnp = ap->a_cnp; 136 struct denode ndirent; 137 struct denode *dep; 138 struct denode *pdep = VTODE(ap->a_dvp); 139 struct timespec ts; 140 int error; 141 142 #ifdef MSDOSFS_DEBUG 143 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 144 #endif 145 146 /* 147 * If this is the root directory and there is no space left we 148 * can't do anything. This is because the root directory can not 149 * change size. 150 */ 151 if (pdep->de_StartCluster == MSDOSFSROOT 152 && pdep->de_fndoffset >= pdep->de_FileSize) { 153 error = ENOSPC; 154 goto bad; 155 } 156 157 /* 158 * Create a directory entry for the file, then call createde() to 159 * have it installed. NOTE: DOS files are always executable. We 160 * use the absence of the owner write bit to make the file 161 * readonly. 162 */ 163 memset(&ndirent, 0, sizeof(ndirent)); 164 error = uniqdosname(pdep, cnp, ndirent.de_Name); 165 if (error) 166 goto bad; 167 168 ndirent.de_Attributes = ATTR_ARCHIVE; 169 ndirent.de_LowerCase = 0; 170 ndirent.de_StartCluster = 0; 171 ndirent.de_FileSize = 0; 172 ndirent.de_pmp = pdep->de_pmp; 173 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 174 vfs_timestamp(&ts); 175 DETIMES(&ndirent, &ts, &ts, &ts); 176 error = createde(&ndirent, pdep, &dep, cnp); 177 if (error) 178 goto bad; 179 *ap->a_vpp = DETOV(dep); 180 if ((cnp->cn_flags & MAKEENTRY) != 0) 181 cache_enter(ap->a_dvp, *ap->a_vpp, cnp); 182 return (0); 183 184 bad: 185 return (error); 186 } 187 188 static int 189 msdosfs_mknod(struct vop_mknod_args *ap) 190 { 191 192 return (EINVAL); 193 } 194 195 static int 196 msdosfs_open(struct vop_open_args *ap) 197 { 198 struct denode *dep = VTODE(ap->a_vp); 199 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 200 return 0; 201 } 202 203 static int 204 msdosfs_close(struct vop_close_args *ap) 205 { 206 struct vnode *vp = ap->a_vp; 207 struct denode *dep = VTODE(vp); 208 struct timespec ts; 209 210 VI_LOCK(vp); 211 if (vp->v_usecount > 1) { 212 vfs_timestamp(&ts); 213 DETIMES(dep, &ts, &ts, &ts); 214 } 215 VI_UNLOCK(vp); 216 return 0; 217 } 218 219 static int 220 msdosfs_access(struct vop_access_args *ap) 221 { 222 struct vnode *vp = ap->a_vp; 223 struct denode *dep = VTODE(ap->a_vp); 224 struct msdosfsmount *pmp = dep->de_pmp; 225 mode_t file_mode; 226 accmode_t accmode = ap->a_accmode; 227 228 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 229 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 230 231 /* 232 * Disallow writing to directories and regular files if the 233 * filesystem is read-only. 234 */ 235 if (accmode & VWRITE) { 236 switch (vp->v_type) { 237 case VREG: 238 case VDIR: 239 if (vp->v_mount->mnt_flag & MNT_RDONLY) 240 return (EROFS); 241 break; 242 default: 243 break; 244 } 245 } 246 247 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 248 ap->a_accmode, ap->a_cred)); 249 } 250 251 static int 252 msdosfs_getattr(struct vop_getattr_args *ap) 253 { 254 struct denode *dep = VTODE(ap->a_vp); 255 struct msdosfsmount *pmp = dep->de_pmp; 256 struct vattr *vap = ap->a_vap; 257 mode_t mode; 258 struct timespec ts; 259 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 260 uint64_t fileid; 261 262 vfs_timestamp(&ts); 263 DETIMES(dep, &ts, &ts, &ts); 264 vap->va_fsid = dev2udev(pmp->pm_dev); 265 /* 266 * The following computation of the fileid must be the same as that 267 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 268 * doesn't work. 269 */ 270 if (dep->de_Attributes & ATTR_DIRECTORY) { 271 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 272 dirsperblk; 273 if (dep->de_StartCluster == MSDOSFSROOT) 274 fileid = 1; 275 } else { 276 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 277 dirsperblk; 278 if (dep->de_dirclust == MSDOSFSROOT) 279 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 280 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 281 } 282 vap->va_fileid = fileid; 283 284 mode = S_IRWXU|S_IRWXG|S_IRWXO; 285 if (dep->de_Attributes & ATTR_READONLY) 286 mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH); 287 vap->va_mode = mode & 288 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 289 vap->va_uid = pmp->pm_uid; 290 vap->va_gid = pmp->pm_gid; 291 vap->va_nlink = 1; 292 vap->va_rdev = NODEV; 293 vap->va_size = dep->de_FileSize; 294 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 295 vap->va_ctime = vap->va_mtime; 296 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 297 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 298 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 299 0, &vap->va_birthtime); 300 } else { 301 vap->va_atime = vap->va_mtime; 302 vap->va_birthtime.tv_sec = -1; 303 vap->va_birthtime.tv_nsec = 0; 304 } 305 vap->va_flags = 0; 306 if (dep->de_Attributes & ATTR_ARCHIVE) 307 vap->va_flags |= UF_ARCHIVE; 308 if (dep->de_Attributes & ATTR_HIDDEN) 309 vap->va_flags |= UF_HIDDEN; 310 if (dep->de_Attributes & ATTR_READONLY) 311 vap->va_flags |= UF_READONLY; 312 if (dep->de_Attributes & ATTR_SYSTEM) 313 vap->va_flags |= UF_SYSTEM; 314 vap->va_gen = 0; 315 vap->va_blocksize = pmp->pm_bpcluster; 316 vap->va_bytes = 317 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 318 vap->va_type = ap->a_vp->v_type; 319 vap->va_filerev = dep->de_modrev; 320 return (0); 321 } 322 323 static int 324 msdosfs_setattr(struct vop_setattr_args *ap) 325 { 326 struct vnode *vp = ap->a_vp; 327 struct denode *dep = VTODE(ap->a_vp); 328 struct msdosfsmount *pmp = dep->de_pmp; 329 struct vattr *vap = ap->a_vap; 330 struct ucred *cred = ap->a_cred; 331 struct thread *td = curthread; 332 int error = 0; 333 334 #ifdef MSDOSFS_DEBUG 335 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 336 ap->a_vp, vap, cred); 337 #endif 338 339 /* 340 * Check for unsettable attributes. 341 */ 342 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 343 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 344 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 345 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 346 #ifdef MSDOSFS_DEBUG 347 printf("msdosfs_setattr(): returning EINVAL\n"); 348 printf(" va_type %d, va_nlink %llx, va_fsid %llx, va_fileid %llx\n", 349 vap->va_type, (unsigned long long)vap->va_nlink, 350 (unsigned long long)vap->va_fsid, 351 (unsigned long long)vap->va_fileid); 352 printf(" va_blocksize %lx, va_rdev %llx, va_bytes %llx, va_gen %lx\n", 353 vap->va_blocksize, (unsigned long long)vap->va_rdev, 354 (unsigned long long)vap->va_bytes, vap->va_gen); 355 printf(" va_uid %x, va_gid %x\n", 356 vap->va_uid, vap->va_gid); 357 #endif 358 return (EINVAL); 359 } 360 361 /* 362 * We don't allow setting attributes on the root directory. 363 * The special case for the root directory is because before 364 * FAT32, the root directory didn't have an entry for itself 365 * (and was otherwise special). With FAT32, the root 366 * directory is not so special, but still doesn't have an 367 * entry for itself. 368 */ 369 if (vp->v_vflag & VV_ROOT) 370 return (EINVAL); 371 372 if (vap->va_flags != VNOVAL) { 373 if (vp->v_mount->mnt_flag & MNT_RDONLY) 374 return (EROFS); 375 if (cred->cr_uid != pmp->pm_uid) { 376 error = priv_check_cred(cred, PRIV_VFS_ADMIN); 377 if (error) 378 return (error); 379 } 380 /* 381 * We are very inconsistent about handling unsupported 382 * attributes. We ignored the access time and the 383 * read and execute bits. We were strict for the other 384 * attributes. 385 */ 386 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY | 387 UF_SYSTEM)) 388 return EOPNOTSUPP; 389 if (vap->va_flags & UF_ARCHIVE) 390 dep->de_Attributes |= ATTR_ARCHIVE; 391 else 392 dep->de_Attributes &= ~ATTR_ARCHIVE; 393 if (vap->va_flags & UF_HIDDEN) 394 dep->de_Attributes |= ATTR_HIDDEN; 395 else 396 dep->de_Attributes &= ~ATTR_HIDDEN; 397 /* We don't allow changing the readonly bit on directories. */ 398 if (vp->v_type != VDIR) { 399 if (vap->va_flags & UF_READONLY) 400 dep->de_Attributes |= ATTR_READONLY; 401 else 402 dep->de_Attributes &= ~ATTR_READONLY; 403 } 404 if (vap->va_flags & UF_SYSTEM) 405 dep->de_Attributes |= ATTR_SYSTEM; 406 else 407 dep->de_Attributes &= ~ATTR_SYSTEM; 408 dep->de_flag |= DE_MODIFIED; 409 } 410 411 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 412 uid_t uid; 413 gid_t gid; 414 415 if (vp->v_mount->mnt_flag & MNT_RDONLY) 416 return (EROFS); 417 uid = vap->va_uid; 418 if (uid == (uid_t)VNOVAL) 419 uid = pmp->pm_uid; 420 gid = vap->va_gid; 421 if (gid == (gid_t)VNOVAL) 422 gid = pmp->pm_gid; 423 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 424 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 425 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 426 if (error) 427 return (error); 428 } 429 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 430 return EINVAL; 431 } 432 433 if (vap->va_size != VNOVAL) { 434 switch (vp->v_type) { 435 case VDIR: 436 return (EISDIR); 437 case VREG: 438 /* 439 * Truncation is only supported for regular files, 440 * Disallow it if the filesystem is read-only. 441 */ 442 if (vp->v_mount->mnt_flag & MNT_RDONLY) 443 return (EROFS); 444 break; 445 default: 446 /* 447 * According to POSIX, the result is unspecified 448 * for file types other than regular files, 449 * directories and shared memory objects. We 450 * don't support any file types except regular 451 * files and directories in this file system, so 452 * this (default) case is unreachable and can do 453 * anything. Keep falling through to detrunc() 454 * for now. 455 */ 456 break; 457 } 458 error = vn_rlimit_trunc(vap->va_size, td); 459 if (error != 0) 460 return (error); 461 error = detrunc(dep, vap->va_size, 0, cred); 462 if (error) 463 return error; 464 } 465 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 466 if (vp->v_mount->mnt_flag & MNT_RDONLY) 467 return (EROFS); 468 error = vn_utimes_perm(vp, vap, cred, td); 469 if (error != 0) 470 return (error); 471 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 472 vap->va_atime.tv_sec != VNOVAL) { 473 dep->de_flag &= ~DE_ACCESS; 474 timespec2fattime(&vap->va_atime, 0, 475 &dep->de_ADate, NULL, NULL); 476 } 477 if (vap->va_mtime.tv_sec != VNOVAL) { 478 dep->de_flag &= ~DE_UPDATE; 479 timespec2fattime(&vap->va_mtime, 0, 480 &dep->de_MDate, &dep->de_MTime, NULL); 481 } 482 /* 483 * We don't set the archive bit when modifying the time of 484 * a directory to emulate the Windows/DOS behavior. 485 */ 486 if (vp->v_type != VDIR) 487 dep->de_Attributes |= ATTR_ARCHIVE; 488 dep->de_flag |= DE_MODIFIED; 489 } 490 /* 491 * DOS files only have the ability to have their writability 492 * attribute set, so we use the owner write bit to set the readonly 493 * attribute. 494 */ 495 if (vap->va_mode != (mode_t)VNOVAL) { 496 if (vp->v_mount->mnt_flag & MNT_RDONLY) 497 return (EROFS); 498 if (cred->cr_uid != pmp->pm_uid) { 499 error = priv_check_cred(cred, PRIV_VFS_ADMIN); 500 if (error) 501 return (error); 502 } 503 if (vp->v_type != VDIR) { 504 /* We ignore the read and execute bits. */ 505 if (vap->va_mode & S_IWUSR) 506 dep->de_Attributes &= ~ATTR_READONLY; 507 else 508 dep->de_Attributes |= ATTR_READONLY; 509 dep->de_Attributes |= ATTR_ARCHIVE; 510 dep->de_flag |= DE_MODIFIED; 511 } 512 } 513 return (deupdat(dep, 0)); 514 } 515 516 static int 517 msdosfs_read(struct vop_read_args *ap) 518 { 519 int error = 0; 520 int blsize; 521 int isadir; 522 ssize_t orig_resid; 523 u_int n; 524 u_long diff; 525 u_long on; 526 daddr_t lbn; 527 daddr_t rablock; 528 int rasize; 529 int seqcount; 530 struct buf *bp; 531 struct vnode *vp = ap->a_vp; 532 struct denode *dep = VTODE(vp); 533 struct msdosfsmount *pmp = dep->de_pmp; 534 struct uio *uio = ap->a_uio; 535 536 /* 537 * If they didn't ask for any data, then we are done. 538 */ 539 orig_resid = uio->uio_resid; 540 if (orig_resid == 0) 541 return (0); 542 543 /* 544 * The caller is supposed to ensure that 545 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 546 * We don't need to check for large offsets as in ffs because 547 * dep->de_FileSize <= MSDOSFS_FILESIZE_MAX < OFF_MAX, so large 548 * offsets cannot cause overflow even in theory. 549 */ 550 551 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 552 553 isadir = dep->de_Attributes & ATTR_DIRECTORY; 554 do { 555 if (uio->uio_offset >= dep->de_FileSize) 556 break; 557 lbn = de_cluster(pmp, uio->uio_offset); 558 rablock = lbn + 1; 559 blsize = pmp->pm_bpcluster; 560 on = uio->uio_offset & pmp->pm_crbomask; 561 /* 562 * If we are operating on a directory file then be sure to 563 * do i/o with the vnode for the filesystem instead of the 564 * vnode for the directory. 565 */ 566 if (isadir) { 567 /* convert cluster # to block # */ 568 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 569 if (error == E2BIG) { 570 error = EINVAL; 571 break; 572 } else if (error) 573 break; 574 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 575 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 576 error = bread(vp, lbn, blsize, NOCRED, &bp); 577 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 578 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 579 NOCRED, on + uio->uio_resid, seqcount, 0, &bp); 580 } else if (seqcount > 1) { 581 rasize = blsize; 582 error = breadn(vp, lbn, 583 blsize, &rablock, &rasize, 1, NOCRED, &bp); 584 } else { 585 error = bread(vp, lbn, blsize, NOCRED, &bp); 586 } 587 if (error) { 588 brelse(bp); 589 break; 590 } 591 diff = pmp->pm_bpcluster - on; 592 n = diff > uio->uio_resid ? uio->uio_resid : diff; 593 diff = dep->de_FileSize - uio->uio_offset; 594 if (diff < n) 595 n = diff; 596 diff = blsize - bp->b_resid; 597 if (diff < n) 598 n = diff; 599 error = vn_io_fault_uiomove(bp->b_data + on, (int) n, uio); 600 brelse(bp); 601 } while (error == 0 && uio->uio_resid > 0 && n != 0); 602 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 603 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 604 dep->de_flag |= DE_ACCESS; 605 return (error); 606 } 607 608 /* 609 * Write data to a file or directory. 610 */ 611 static int 612 msdosfs_write(struct vop_write_args *ap) 613 { 614 int n; 615 int croffset; 616 ssize_t resid, r; 617 u_long osize; 618 int error = 0; 619 u_long count; 620 int seqcount; 621 daddr_t bn, lastcn; 622 struct buf *bp; 623 int ioflag = ap->a_ioflag; 624 struct uio *uio = ap->a_uio; 625 struct vnode *vp = ap->a_vp; 626 struct vnode *thisvp; 627 struct denode *dep = VTODE(vp); 628 struct msdosfsmount *pmp = dep->de_pmp; 629 struct ucred *cred = ap->a_cred; 630 631 #ifdef MSDOSFS_DEBUG 632 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 633 vp, uio, ioflag, cred); 634 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 635 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 636 #endif 637 638 switch (vp->v_type) { 639 case VREG: 640 if (ioflag & IO_APPEND) 641 uio->uio_offset = dep->de_FileSize; 642 thisvp = vp; 643 break; 644 case VDIR: 645 return EISDIR; 646 default: 647 panic("msdosfs_write(): bad file type"); 648 } 649 650 /* 651 * This is needed (unlike in ffs_write()) because we extend the 652 * file outside of the loop but we don't want to extend the file 653 * for writes of 0 bytes. 654 */ 655 if (uio->uio_resid == 0) 656 return (0); 657 658 /* 659 * The caller is supposed to ensure that 660 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 661 * 662 * If they've exceeded their filesize limit, tell them about it. 663 */ 664 error = vn_rlimit_fsizex(vp, uio, MSDOSFS_FILESIZE_MAX, &r, 665 uio->uio_td); 666 if (error != 0) { 667 vn_rlimit_fsizex_res(uio, r); 668 return (error); 669 } 670 671 /* 672 * If the offset we are starting the write at is beyond the end of 673 * the file, then they've done a seek. Unix filesystems allow 674 * files with holes in them, DOS doesn't so we must fill the hole 675 * with zeroed blocks. 676 */ 677 if (uio->uio_offset > dep->de_FileSize) { 678 error = deextend(dep, uio->uio_offset, cred); 679 if (error != 0) { 680 vn_rlimit_fsizex_res(uio, r); 681 return (error); 682 } 683 } 684 685 /* 686 * Remember some values in case the write fails. 687 */ 688 resid = uio->uio_resid; 689 osize = dep->de_FileSize; 690 691 /* 692 * If we write beyond the end of the file, extend it to its ultimate 693 * size ahead of the time to hopefully get a contiguous area. 694 */ 695 if (uio->uio_offset + resid > osize) { 696 count = de_clcount(pmp, uio->uio_offset + resid) - 697 de_clcount(pmp, osize); 698 error = extendfile(dep, count, NULL, NULL, 0); 699 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 700 goto errexit; 701 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 702 } else 703 lastcn = de_clcount(pmp, osize) - 1; 704 705 seqcount = ioflag >> IO_SEQSHIFT; 706 do { 707 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 708 error = ENOSPC; 709 break; 710 } 711 712 croffset = uio->uio_offset & pmp->pm_crbomask; 713 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 714 if (uio->uio_offset + n > dep->de_FileSize) { 715 dep->de_FileSize = uio->uio_offset + n; 716 /* The object size needs to be set before buffer is allocated */ 717 vnode_pager_setsize(vp, dep->de_FileSize); 718 } 719 720 bn = de_cluster(pmp, uio->uio_offset); 721 if ((uio->uio_offset & pmp->pm_crbomask) == 0 722 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 723 > de_cluster(pmp, uio->uio_offset) 724 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 725 /* 726 * If either the whole cluster gets written, 727 * or we write the cluster from its start beyond EOF, 728 * then no need to read data from disk. 729 */ 730 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 731 /* 732 * This call to vfs_bio_clrbuf() ensures that 733 * even if vn_io_fault_uiomove() below faults, 734 * garbage from the newly instantiated buffer 735 * is not exposed to the userspace via mmap(). 736 */ 737 vfs_bio_clrbuf(bp); 738 /* 739 * Do the bmap now, since pcbmap needs buffers 740 * for the FAT table. (see msdosfs_strategy) 741 */ 742 if (bp->b_blkno == bp->b_lblkno) { 743 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 744 if (error) 745 bp->b_blkno = -1; 746 else 747 bp->b_blkno = bn; 748 } 749 if (bp->b_blkno == -1) { 750 brelse(bp); 751 if (!error) 752 error = EIO; /* XXX */ 753 break; 754 } 755 } else { 756 /* 757 * The block we need to write into exists, so read it in. 758 */ 759 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 760 if (error) { 761 break; 762 } 763 } 764 765 /* 766 * Should these vnode_pager_* functions be done on dir 767 * files? 768 */ 769 770 /* 771 * Copy the data from user space into the buf header. 772 */ 773 error = vn_io_fault_uiomove(bp->b_data + croffset, n, uio); 774 if (error) { 775 brelse(bp); 776 break; 777 } 778 779 /* Prepare for clustered writes in some else clauses. */ 780 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 781 bp->b_flags |= B_CLUSTEROK; 782 783 /* 784 * If IO_SYNC, then each buffer is written synchronously. 785 * Otherwise, if we have a severe page deficiency then 786 * write the buffer asynchronously. Otherwise, if on a 787 * cluster boundary then write the buffer asynchronously, 788 * combining it with contiguous clusters if permitted and 789 * possible, since we don't expect more writes into this 790 * buffer soon. Otherwise, do a delayed write because we 791 * expect more writes into this buffer soon. 792 */ 793 if (ioflag & IO_SYNC) 794 (void)bwrite(bp); 795 else if (vm_page_count_severe() || buf_dirty_count_severe()) 796 bawrite(bp); 797 else if (n + croffset == pmp->pm_bpcluster) { 798 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 799 cluster_write(vp, &dep->de_clusterw, bp, 800 dep->de_FileSize, seqcount, 0); 801 else 802 bawrite(bp); 803 } else 804 bdwrite(bp); 805 dep->de_flag |= DE_UPDATE; 806 } while (error == 0 && uio->uio_resid > 0); 807 808 /* 809 * If the write failed and they want us to, truncate the file back 810 * to the size it was before the write was attempted. 811 */ 812 errexit: 813 if (error) { 814 if (ioflag & IO_UNIT) { 815 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 816 uio->uio_offset -= resid - uio->uio_resid; 817 uio->uio_resid = resid; 818 } else { 819 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 820 if (uio->uio_resid != resid) 821 error = 0; 822 } 823 } else if (ioflag & IO_SYNC) 824 error = deupdat(dep, 1); 825 vn_rlimit_fsizex_res(uio, r); 826 return (error); 827 } 828 829 /* 830 * Flush the blocks of a file to disk. 831 */ 832 static int 833 msdosfs_fsync(struct vop_fsync_args *ap) 834 { 835 struct vnode *devvp; 836 int allerror, error; 837 838 vop_stdfsync(ap); 839 840 /* 841 * If the syncing request comes from fsync(2), sync the entire 842 * FAT and any other metadata that happens to be on devvp. We 843 * need this mainly for the FAT. We write the FAT sloppily, and 844 * syncing it all now is the best we can easily do to get all 845 * directory entries associated with the file (not just the file) 846 * fully synced. The other metadata includes critical metadata 847 * for all directory entries, but only in the MNT_ASYNC case. We 848 * will soon sync all metadata in the file's directory entry. 849 * Non-critical metadata for associated directory entries only 850 * gets synced accidentally, as in most file systems. 851 */ 852 if (ap->a_waitfor != MNT_NOWAIT) { 853 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 854 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 855 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 856 VOP_UNLOCK(devvp); 857 } else 858 allerror = 0; 859 860 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor != MNT_NOWAIT); 861 if (allerror == 0) 862 allerror = error; 863 return (allerror); 864 } 865 866 static int 867 msdosfs_remove(struct vop_remove_args *ap) 868 { 869 struct denode *dep = VTODE(ap->a_vp); 870 struct denode *ddep = VTODE(ap->a_dvp); 871 int error; 872 873 if (ap->a_vp->v_type == VDIR) 874 error = EPERM; 875 else 876 error = removede(ddep, dep); 877 #ifdef MSDOSFS_DEBUG 878 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 879 #endif 880 return (error); 881 } 882 883 /* 884 * DOS filesystems don't know what links are. 885 */ 886 static int 887 msdosfs_link(struct vop_link_args *ap) 888 { 889 return (EOPNOTSUPP); 890 } 891 892 /* 893 * Renames on files require moving the denode to a new hash queue since the 894 * denode's location is used to compute which hash queue to put the file 895 * in. Unless it is a rename in place. For example "mv a b". 896 * 897 * What follows is the basic algorithm: 898 * 899 * if (file move) { 900 * if (dest file exists) { 901 * remove dest file 902 * } 903 * if (dest and src in same directory) { 904 * rewrite name in existing directory slot 905 * } else { 906 * write new entry in dest directory 907 * update offset and dirclust in denode 908 * move denode to new hash chain 909 * clear old directory entry 910 * } 911 * } else { 912 * directory move 913 * if (dest directory exists) { 914 * if (dest is not empty) { 915 * return ENOTEMPTY 916 * } 917 * remove dest directory 918 * } 919 * if (dest and src in same directory) { 920 * rewrite name in existing entry 921 * } else { 922 * be sure dest is not a child of src directory 923 * write entry in dest directory 924 * update "." and ".." in moved directory 925 * clear old directory entry for moved directory 926 * } 927 * } 928 * 929 * On entry: 930 * source's parent directory is unlocked 931 * source file or directory is unlocked 932 * destination's parent directory is locked 933 * destination file or directory is locked if it exists 934 * 935 * On exit: 936 * all denodes should be released 937 */ 938 static int 939 msdosfs_rename(struct vop_rename_args *ap) 940 { 941 struct vnode *fdvp, *fvp, *tdvp, *tvp, *vp; 942 struct componentname *fcnp, *tcnp; 943 struct denode *fdip, *fip, *tdip, *tip, *nip; 944 u_char toname[12], oldname[11]; 945 u_long to_diroffset; 946 bool checkpath_locked, doingdirectory, newparent; 947 int error; 948 u_long cn, pcl, blkoff; 949 daddr_t bn, wait_scn, scn; 950 struct msdosfsmount *pmp; 951 struct direntry *dotdotp; 952 struct buf *bp; 953 954 tdvp = ap->a_tdvp; 955 fvp = ap->a_fvp; 956 fdvp = ap->a_fdvp; 957 tvp = ap->a_tvp; 958 tcnp = ap->a_tcnp; 959 fcnp = ap->a_fcnp; 960 pmp = VFSTOMSDOSFS(fdvp->v_mount); 961 962 /* 963 * Check for cross-device rename. 964 */ 965 if (fvp->v_mount != tdvp->v_mount || 966 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 967 error = EXDEV; 968 goto abortit; 969 } 970 971 /* 972 * If source and dest are the same, do nothing. 973 */ 974 if (tvp == fvp) { 975 error = 0; 976 goto abortit; 977 } 978 979 /* 980 * When the target exists, both the directory 981 * and target vnodes are passed locked. 982 */ 983 VOP_UNLOCK(tdvp); 984 if (tvp != NULL && tvp != tdvp) 985 VOP_UNLOCK(tvp); 986 987 checkpath_locked = false; 988 989 relock: 990 doingdirectory = newparent = false; 991 992 error = vn_lock(fdvp, LK_EXCLUSIVE); 993 if (error != 0) 994 goto releout; 995 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 996 VOP_UNLOCK(fdvp); 997 error = vn_lock(tdvp, LK_EXCLUSIVE); 998 if (error != 0) 999 goto releout; 1000 VOP_UNLOCK(tdvp); 1001 goto relock; 1002 } 1003 1004 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1005 if (error != 0) { 1006 VOP_UNLOCK(fdvp); 1007 VOP_UNLOCK(tdvp); 1008 goto releout; 1009 } 1010 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, &nip); 1011 if (error != 0) { 1012 VOP_UNLOCK(fdvp); 1013 VOP_UNLOCK(tdvp); 1014 if (error != EBUSY) 1015 goto releout; 1016 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, &nip); 1017 if (error != 0) 1018 goto releout; 1019 vp = fvp; 1020 fvp = DETOV(nip); 1021 VOP_UNLOCK(fvp); 1022 vrele(vp); 1023 goto relock; 1024 } 1025 vrele(fvp); 1026 fvp = DETOV(nip); 1027 1028 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1029 if (error != 0 && error != EJUSTRETURN) { 1030 VOP_UNLOCK(fdvp); 1031 VOP_UNLOCK(tdvp); 1032 VOP_UNLOCK(fvp); 1033 goto releout; 1034 } 1035 if (error == EJUSTRETURN && tvp != NULL) { 1036 vrele(tvp); 1037 tvp = NULL; 1038 } 1039 if (error == 0) { 1040 nip = NULL; 1041 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, 1042 &nip); 1043 if (tvp != NULL) { 1044 vrele(tvp); 1045 tvp = NULL; 1046 } 1047 if (error != 0) { 1048 VOP_UNLOCK(fdvp); 1049 VOP_UNLOCK(tdvp); 1050 VOP_UNLOCK(fvp); 1051 if (error != EBUSY) 1052 goto releout; 1053 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, 1054 &nip); 1055 if (error != 0) 1056 goto releout; 1057 vput(DETOV(nip)); 1058 goto relock; 1059 } 1060 tvp = DETOV(nip); 1061 } 1062 1063 fdip = VTODE(fdvp); 1064 fip = VTODE(fvp); 1065 tdip = VTODE(tdvp); 1066 tip = tvp != NULL ? VTODE(tvp) : NULL; 1067 1068 /* 1069 * Remember direntry place to use for destination 1070 */ 1071 to_diroffset = tdip->de_fndoffset; 1072 1073 /* 1074 * Be sure we are not renaming ".", "..", or an alias of ".". This 1075 * leads to a crippled directory tree. It's pretty tough to do a 1076 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1077 * doesn't work if the ".." entry is missing. 1078 */ 1079 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) { 1080 /* 1081 * Avoid ".", "..", and aliases of "." for obvious reasons. 1082 */ 1083 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1084 fdip == fip || 1085 (fcnp->cn_flags & ISDOTDOT) != 0 || 1086 (tcnp->cn_flags & ISDOTDOT) != 0) { 1087 error = EINVAL; 1088 goto unlock; 1089 } 1090 doingdirectory = true; 1091 } 1092 1093 /* 1094 * If ".." must be changed (ie the directory gets a new 1095 * parent) then the source directory must not be in the 1096 * directory hierarchy above the target, as this would 1097 * orphan everything below the source directory. Also 1098 * the user must have write permission in the source so 1099 * as to be able to change "..". We must repeat the call 1100 * to namei, as the parent directory is unlocked by the 1101 * call to doscheckpath(). 1102 */ 1103 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, curthread); 1104 if (fdip->de_StartCluster != tdip->de_StartCluster) 1105 newparent = true; 1106 if (doingdirectory && newparent) { 1107 if (error != 0) /* write access check above */ 1108 goto unlock; 1109 lockmgr(&pmp->pm_checkpath_lock, LK_EXCLUSIVE, NULL); 1110 checkpath_locked = true; 1111 error = doscheckpath(fip, tdip, &wait_scn); 1112 if (wait_scn != 0) { 1113 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1114 checkpath_locked = false; 1115 VOP_UNLOCK(fdvp); 1116 VOP_UNLOCK(tdvp); 1117 VOP_UNLOCK(fvp); 1118 if (tvp != NULL && tvp != tdvp) 1119 VOP_UNLOCK(tvp); 1120 error = deget(pmp, wait_scn, 0, LK_EXCLUSIVE, 1121 &nip); 1122 if (error == 0) { 1123 vput(DETOV(nip)); 1124 goto relock; 1125 } 1126 } 1127 if (error != 0) 1128 goto unlock; 1129 } 1130 1131 if (tip != NULL) { 1132 /* 1133 * Target must be empty if a directory and have no links 1134 * to it. Also, ensure source and target are compatible 1135 * (both directories, or both not directories). 1136 */ 1137 if ((tip->de_Attributes & ATTR_DIRECTORY) != 0) { 1138 if (!dosdirempty(tip)) { 1139 error = ENOTEMPTY; 1140 goto unlock; 1141 } 1142 if (!doingdirectory) { 1143 error = ENOTDIR; 1144 goto unlock; 1145 } 1146 cache_purge(tdvp); 1147 } else if (doingdirectory) { 1148 error = EISDIR; 1149 goto unlock; 1150 } 1151 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1152 MPASS(error == 0); 1153 error = removede(tdip, tip); 1154 if (error != 0) 1155 goto unlock; 1156 vput(tvp); 1157 tvp = NULL; 1158 tip = NULL; 1159 } 1160 1161 /* 1162 * Convert the filename in tcnp into a dos filename. We copy this 1163 * into the denode and directory entry for the destination 1164 * file/directory. 1165 */ 1166 error = uniqdosname(tdip, tcnp, toname); 1167 if (error != 0) 1168 goto unlock; 1169 1170 /* 1171 * First write a new entry in the destination 1172 * directory and mark the entry in the source directory 1173 * as deleted. Then move the denode to the correct hash 1174 * chain for its new location in the filesystem. And, if 1175 * we moved a directory, then update its .. entry to point 1176 * to the new parent directory. 1177 */ 1178 memcpy(oldname, fip->de_Name, 11); 1179 memcpy(fip->de_Name, toname, 11); /* update denode */ 1180 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1181 MPASS(error == EJUSTRETURN); 1182 error = createde(fip, tdip, NULL, tcnp); 1183 if (error != 0) { 1184 memcpy(fip->de_Name, oldname, 11); 1185 goto unlock; 1186 } 1187 1188 /* 1189 * If fip is for a directory, then its name should always 1190 * be "." since it is for the directory entry in the 1191 * directory itself (msdosfs_lookup() always translates 1192 * to the "." entry so as to get a unique denode, except 1193 * for the root directory there are different 1194 * complications). However, we just corrupted its name 1195 * to pass the correct name to createde(). Undo this. 1196 */ 1197 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) 1198 memcpy(fip->de_Name, oldname, 11); 1199 fip->de_refcnt++; 1200 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1201 MPASS(error == 0); 1202 error = removede(fdip, fip); 1203 if (error != 0) { 1204 /* XXX should downgrade to ro here, fs is corrupt */ 1205 goto unlock; 1206 } 1207 if (!doingdirectory) { 1208 error = pcbmap(tdip, de_cluster(pmp, to_diroffset), 0, 1209 &fip->de_dirclust, 0); 1210 if (error != 0) { 1211 /* 1212 * XXX should downgrade to ro here, 1213 * fs is corrupt 1214 */ 1215 goto unlock; 1216 } 1217 if (fip->de_dirclust == MSDOSFSROOT) 1218 fip->de_diroffset = to_diroffset; 1219 else 1220 fip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1221 } 1222 reinsert(fip); 1223 1224 /* 1225 * If we moved a directory to a new parent directory, then we must 1226 * fixup the ".." entry in the moved directory. 1227 */ 1228 if (doingdirectory && newparent) { 1229 cn = fip->de_StartCluster; 1230 if (cn == MSDOSFSROOT) { 1231 /* this should never happen */ 1232 panic("msdosfs_rename(): updating .. in root directory?"); 1233 } else 1234 bn = cntobn(pmp, cn); 1235 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1236 NOCRED, &bp); 1237 if (error != 0) { 1238 /* XXX should downgrade to ro here, fs is corrupt */ 1239 goto unlock; 1240 } 1241 dotdotp = (struct direntry *)bp->b_data + 1; 1242 pcl = tdip->de_StartCluster; 1243 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1244 pcl = MSDOSFSROOT; 1245 putushort(dotdotp->deStartCluster, pcl); 1246 if (FAT32(pmp)) 1247 putushort(dotdotp->deHighClust, pcl >> 16); 1248 if (DOINGASYNC(fvp)) 1249 bdwrite(bp); 1250 else if ((error = bwrite(bp)) != 0) { 1251 /* XXX should downgrade to ro here, fs is corrupt */ 1252 goto unlock; 1253 } 1254 } 1255 1256 /* 1257 * The msdosfs lookup is case insensitive. Several aliases may 1258 * be inserted for a single directory entry. As a consequnce, 1259 * name cache purge done by lookup for fvp when DELETE op for 1260 * namei is specified, might be not enough to expunge all 1261 * namecache entries that were installed for this direntry. 1262 */ 1263 cache_purge(fvp); 1264 1265 unlock: 1266 if (checkpath_locked) 1267 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1268 vput(fdvp); 1269 vput(fvp); 1270 if (tvp != NULL) { 1271 if (tvp != tdvp) 1272 vput(tvp); 1273 else 1274 vrele(tvp); 1275 } 1276 vput(tdvp); 1277 return (error); 1278 releout: 1279 MPASS(!checkpath_locked); 1280 vrele(tdvp); 1281 if (tvp != NULL) 1282 vrele(tvp); 1283 vrele(fdvp); 1284 vrele(fvp); 1285 return (error); 1286 abortit: 1287 if (tdvp == tvp) 1288 vrele(tdvp); 1289 else 1290 vput(tdvp); 1291 if (tvp != NULL) 1292 vput(tvp); 1293 vrele(fdvp); 1294 vrele(fvp); 1295 return (error); 1296 } 1297 1298 static struct { 1299 struct direntry dot; 1300 struct direntry dotdot; 1301 } dosdirtemplate = { 1302 { ". ", /* the . entry */ 1303 ATTR_DIRECTORY, /* file attribute */ 1304 0, /* reserved */ 1305 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1306 { 0, 0 }, /* access date */ 1307 { 0, 0 }, /* high bits of start cluster */ 1308 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1309 { 0, 0 }, /* startcluster */ 1310 { 0, 0, 0, 0 } /* filesize */ 1311 }, 1312 { ".. ", /* the .. entry */ 1313 ATTR_DIRECTORY, /* file attribute */ 1314 0, /* reserved */ 1315 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1316 { 0, 0 }, /* access date */ 1317 { 0, 0 }, /* high bits of start cluster */ 1318 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1319 { 0, 0 }, /* startcluster */ 1320 { 0, 0, 0, 0 } /* filesize */ 1321 } 1322 }; 1323 1324 static int 1325 msdosfs_mkdir(struct vop_mkdir_args *ap) 1326 { 1327 struct componentname *cnp = ap->a_cnp; 1328 struct denode *dep; 1329 struct denode *pdep = VTODE(ap->a_dvp); 1330 struct direntry *denp; 1331 struct msdosfsmount *pmp = pdep->de_pmp; 1332 struct buf *bp; 1333 u_long newcluster, pcl; 1334 int bn; 1335 int error; 1336 struct denode ndirent; 1337 struct timespec ts; 1338 1339 /* 1340 * If this is the root directory and there is no space left we 1341 * can't do anything. This is because the root directory can not 1342 * change size. 1343 */ 1344 if (pdep->de_StartCluster == MSDOSFSROOT 1345 && pdep->de_fndoffset >= pdep->de_FileSize) { 1346 error = ENOSPC; 1347 goto bad2; 1348 } 1349 1350 /* 1351 * Allocate a cluster to hold the about to be created directory. 1352 */ 1353 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1354 if (error) 1355 goto bad2; 1356 1357 memset(&ndirent, 0, sizeof(ndirent)); 1358 ndirent.de_pmp = pmp; 1359 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1360 vfs_timestamp(&ts); 1361 DETIMES(&ndirent, &ts, &ts, &ts); 1362 1363 /* 1364 * Now fill the cluster with the "." and ".." entries. And write 1365 * the cluster to disk. This way it is there for the parent 1366 * directory to be pointing at if there were a crash. 1367 */ 1368 bn = cntobn(pmp, newcluster); 1369 /* always succeeds */ 1370 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1371 memset(bp->b_data, 0, pmp->pm_bpcluster); 1372 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1373 denp = (struct direntry *)bp->b_data; 1374 putushort(denp[0].deStartCluster, newcluster); 1375 putushort(denp[0].deCDate, ndirent.de_CDate); 1376 putushort(denp[0].deCTime, ndirent.de_CTime); 1377 denp[0].deCHundredth = ndirent.de_CHun; 1378 putushort(denp[0].deADate, ndirent.de_ADate); 1379 putushort(denp[0].deMDate, ndirent.de_MDate); 1380 putushort(denp[0].deMTime, ndirent.de_MTime); 1381 pcl = pdep->de_StartCluster; 1382 /* 1383 * Although the root directory has a non-magic starting cluster 1384 * number for FAT32, chkdsk and fsck_msdosfs still require 1385 * references to it in dotdot entries to be magic. 1386 */ 1387 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1388 pcl = MSDOSFSROOT; 1389 putushort(denp[1].deStartCluster, pcl); 1390 putushort(denp[1].deCDate, ndirent.de_CDate); 1391 putushort(denp[1].deCTime, ndirent.de_CTime); 1392 denp[1].deCHundredth = ndirent.de_CHun; 1393 putushort(denp[1].deADate, ndirent.de_ADate); 1394 putushort(denp[1].deMDate, ndirent.de_MDate); 1395 putushort(denp[1].deMTime, ndirent.de_MTime); 1396 if (FAT32(pmp)) { 1397 putushort(denp[0].deHighClust, newcluster >> 16); 1398 putushort(denp[1].deHighClust, pcl >> 16); 1399 } 1400 1401 if (DOINGASYNC(ap->a_dvp)) 1402 bdwrite(bp); 1403 else if ((error = bwrite(bp)) != 0) 1404 goto bad; 1405 1406 /* 1407 * Now build up a directory entry pointing to the newly allocated 1408 * cluster. This will be written to an empty slot in the parent 1409 * directory. 1410 */ 1411 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1412 if (error) 1413 goto bad; 1414 1415 ndirent.de_Attributes = ATTR_DIRECTORY; 1416 ndirent.de_LowerCase = 0; 1417 ndirent.de_StartCluster = newcluster; 1418 ndirent.de_FileSize = 0; 1419 error = createde(&ndirent, pdep, &dep, cnp); 1420 if (error) 1421 goto bad; 1422 *ap->a_vpp = DETOV(dep); 1423 return (0); 1424 1425 bad: 1426 clusterfree(pmp, newcluster); 1427 bad2: 1428 return (error); 1429 } 1430 1431 static int 1432 msdosfs_rmdir(struct vop_rmdir_args *ap) 1433 { 1434 struct vnode *vp = ap->a_vp; 1435 struct vnode *dvp = ap->a_dvp; 1436 struct componentname *cnp = ap->a_cnp; 1437 struct denode *ip, *dp; 1438 int error; 1439 1440 ip = VTODE(vp); 1441 dp = VTODE(dvp); 1442 1443 /* 1444 * Verify the directory is empty (and valid). 1445 * (Rmdir ".." won't be valid since 1446 * ".." will contain a reference to 1447 * the current directory and thus be 1448 * non-empty.) 1449 */ 1450 error = 0; 1451 if (!dosdirempty(ip)) { 1452 error = ENOTEMPTY; 1453 goto out; 1454 } 1455 /* 1456 * Delete the entry from the directory. For dos filesystems this 1457 * gets rid of the directory entry on disk, the in memory copy 1458 * still exists but the de_refcnt is <= 0. This prevents it from 1459 * being found by deget(). When the vput() on dep is done we give 1460 * up access and eventually msdosfs_reclaim() will be called which 1461 * will remove it from the denode cache. 1462 */ 1463 error = removede(dp, ip); 1464 if (error) 1465 goto out; 1466 /* 1467 * This is where we decrement the link count in the parent 1468 * directory. Since dos filesystems don't do this we just purge 1469 * the name cache. 1470 */ 1471 cache_purge(dvp); 1472 /* 1473 * Truncate the directory that is being deleted. 1474 */ 1475 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1476 cache_purge(vp); 1477 1478 out: 1479 return (error); 1480 } 1481 1482 /* 1483 * DOS filesystems don't know what symlinks are. 1484 */ 1485 static int 1486 msdosfs_symlink(struct vop_symlink_args *ap) 1487 { 1488 return (EOPNOTSUPP); 1489 } 1490 1491 static int 1492 msdosfs_readdir(struct vop_readdir_args *ap) 1493 { 1494 struct mbnambuf nb; 1495 int error = 0; 1496 int diff; 1497 long n; 1498 int blsize; 1499 long on; 1500 u_long cn; 1501 u_long dirsperblk; 1502 long bias = 0; 1503 daddr_t bn, lbn; 1504 struct buf *bp; 1505 struct denode *dep = VTODE(ap->a_vp); 1506 struct msdosfsmount *pmp = dep->de_pmp; 1507 struct direntry *dentp; 1508 struct dirent dirbuf; 1509 struct uio *uio = ap->a_uio; 1510 uint64_t *cookies = NULL; 1511 int ncookies = 0; 1512 off_t offset, off; 1513 int chksum = -1; 1514 1515 #ifdef MSDOSFS_DEBUG 1516 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1517 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1518 #endif 1519 1520 /* 1521 * msdosfs_readdir() won't operate properly on regular files since 1522 * it does i/o only with the filesystem vnode, and hence can 1523 * retrieve the wrong block from the buffer cache for a plain file. 1524 * So, fail attempts to readdir() on a plain file. 1525 */ 1526 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1527 return (ENOTDIR); 1528 1529 /* 1530 * To be safe, initialize dirbuf 1531 */ 1532 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name)); 1533 1534 /* 1535 * If the user buffer is smaller than the size of one dos directory 1536 * entry or the file offset is not a multiple of the size of a 1537 * directory entry, then we fail the read. 1538 */ 1539 off = offset = uio->uio_offset; 1540 if (uio->uio_resid < sizeof(struct direntry) || 1541 (offset & (sizeof(struct direntry) - 1))) 1542 return (EINVAL); 1543 1544 if (ap->a_ncookies) { 1545 ncookies = uio->uio_resid / 16; 1546 cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, 1547 M_WAITOK); 1548 *ap->a_cookies = cookies; 1549 *ap->a_ncookies = ncookies; 1550 } 1551 1552 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1553 1554 /* 1555 * If they are reading from the root directory then, we simulate 1556 * the . and .. entries since these don't exist in the root 1557 * directory. We also set the offset bias to make up for having to 1558 * simulate these entries. By this I mean that at file offset 64 we 1559 * read the first entry in the root directory that lives on disk. 1560 */ 1561 if (dep->de_StartCluster == MSDOSFSROOT 1562 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1563 #if 0 1564 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1565 offset); 1566 #endif 1567 bias = 2 * sizeof(struct direntry); 1568 if (offset < bias) { 1569 for (n = (int)offset / sizeof(struct direntry); 1570 n < 2; n++) { 1571 dirbuf.d_fileno = FAT32(pmp) ? 1572 (uint64_t)cntobn(pmp, pmp->pm_rootdirblk) * 1573 dirsperblk : 1; 1574 dirbuf.d_type = DT_DIR; 1575 switch (n) { 1576 case 0: 1577 dirbuf.d_namlen = 1; 1578 dirbuf.d_name[0] = '.'; 1579 break; 1580 case 1: 1581 dirbuf.d_namlen = 2; 1582 dirbuf.d_name[0] = '.'; 1583 dirbuf.d_name[1] = '.'; 1584 break; 1585 } 1586 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1587 /* NOTE: d_off is the offset of the *next* entry. */ 1588 dirbuf.d_off = offset + sizeof(struct direntry); 1589 dirent_terminate(&dirbuf); 1590 if (uio->uio_resid < dirbuf.d_reclen) 1591 goto out; 1592 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1593 if (error) 1594 goto out; 1595 offset += sizeof(struct direntry); 1596 off = offset; 1597 if (cookies) { 1598 *cookies++ = offset; 1599 if (--ncookies <= 0) 1600 goto out; 1601 } 1602 } 1603 } 1604 } 1605 1606 mbnambuf_init(&nb); 1607 off = offset; 1608 while (uio->uio_resid > 0) { 1609 lbn = de_cluster(pmp, offset - bias); 1610 on = (offset - bias) & pmp->pm_crbomask; 1611 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1612 diff = dep->de_FileSize - (offset - bias); 1613 if (diff <= 0) 1614 break; 1615 n = min(n, diff); 1616 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1617 if (error) 1618 break; 1619 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1620 if (error) { 1621 return (error); 1622 } 1623 n = min(n, blsize - bp->b_resid); 1624 if (n == 0) { 1625 brelse(bp); 1626 return (EIO); 1627 } 1628 1629 /* 1630 * Convert from dos directory entries to fs-independent 1631 * directory entries. 1632 */ 1633 for (dentp = (struct direntry *)(bp->b_data + on); 1634 (char *)dentp < bp->b_data + on + n; 1635 dentp++, offset += sizeof(struct direntry)) { 1636 #if 0 1637 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1638 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1639 #endif 1640 /* 1641 * If this is an unused entry, we can stop. 1642 */ 1643 if (dentp->deName[0] == SLOT_EMPTY) { 1644 brelse(bp); 1645 goto out; 1646 } 1647 /* 1648 * Skip deleted entries. 1649 */ 1650 if (dentp->deName[0] == SLOT_DELETED) { 1651 chksum = -1; 1652 mbnambuf_init(&nb); 1653 continue; 1654 } 1655 1656 /* 1657 * Handle Win95 long directory entries 1658 */ 1659 if (dentp->deAttributes == ATTR_WIN95) { 1660 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1661 continue; 1662 chksum = win2unixfn(&nb, 1663 (struct winentry *)dentp, chksum, pmp); 1664 continue; 1665 } 1666 1667 /* 1668 * Skip volume labels 1669 */ 1670 if (dentp->deAttributes & ATTR_VOLUME) { 1671 chksum = -1; 1672 mbnambuf_init(&nb); 1673 continue; 1674 } 1675 /* 1676 * This computation of d_fileno must match 1677 * the computation of va_fileid in 1678 * msdosfs_getattr. 1679 */ 1680 if (dentp->deAttributes & ATTR_DIRECTORY) { 1681 cn = getushort(dentp->deStartCluster); 1682 if (FAT32(pmp)) { 1683 cn |= getushort(dentp->deHighClust) << 1684 16; 1685 if (cn == MSDOSFSROOT) 1686 cn = pmp->pm_rootdirblk; 1687 } 1688 if (cn == MSDOSFSROOT && !FAT32(pmp)) 1689 dirbuf.d_fileno = 1; 1690 else 1691 dirbuf.d_fileno = cntobn(pmp, cn) * 1692 dirsperblk; 1693 dirbuf.d_type = DT_DIR; 1694 } else { 1695 dirbuf.d_fileno = (uoff_t)offset / 1696 sizeof(struct direntry); 1697 dirbuf.d_type = DT_REG; 1698 } 1699 1700 if (chksum != winChksum(dentp->deName)) { 1701 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1702 (u_char *)dirbuf.d_name, 1703 dentp->deLowerCase | 1704 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1705 (LCASE_BASE | LCASE_EXT) : 0), 1706 pmp); 1707 mbnambuf_init(&nb); 1708 } else 1709 mbnambuf_flush(&nb, &dirbuf); 1710 chksum = -1; 1711 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1712 /* NOTE: d_off is the offset of the *next* entry. */ 1713 dirbuf.d_off = offset + sizeof(struct direntry); 1714 dirent_terminate(&dirbuf); 1715 if (uio->uio_resid < dirbuf.d_reclen) { 1716 brelse(bp); 1717 goto out; 1718 } 1719 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1720 if (error) { 1721 brelse(bp); 1722 goto out; 1723 } 1724 if (cookies) { 1725 *cookies++ = offset + sizeof(struct direntry); 1726 if (--ncookies <= 0) { 1727 brelse(bp); 1728 goto out; 1729 } 1730 } 1731 off = offset + sizeof(struct direntry); 1732 } 1733 brelse(bp); 1734 } 1735 out: 1736 /* Subtract unused cookies */ 1737 if (ap->a_ncookies) 1738 *ap->a_ncookies -= ncookies; 1739 1740 uio->uio_offset = off; 1741 1742 /* 1743 * Set the eofflag (NFS uses it) 1744 */ 1745 if (ap->a_eofflag) { 1746 if (dep->de_FileSize - (offset - bias) <= 0) 1747 *ap->a_eofflag = 1; 1748 else 1749 *ap->a_eofflag = 0; 1750 } 1751 return (error); 1752 } 1753 1754 /*- 1755 * a_vp - pointer to the file's vnode 1756 * a_bn - logical block number within the file (cluster number for us) 1757 * a_bop - where to return the bufobj of the special file containing the fs 1758 * a_bnp - where to return the "physical" block number corresponding to a_bn 1759 * (relative to the special file; units are blocks of size DEV_BSIZE) 1760 * a_runp - where to return the "run past" a_bn. This is the count of logical 1761 * blocks whose physical blocks (together with a_bn's physical block) 1762 * are contiguous. 1763 * a_runb - where to return the "run before" a_bn. 1764 */ 1765 static int 1766 msdosfs_bmap(struct vop_bmap_args *ap) 1767 { 1768 struct fatcache savefc; 1769 struct denode *dep; 1770 struct mount *mp; 1771 struct msdosfsmount *pmp; 1772 struct vnode *vp; 1773 daddr_t runbn; 1774 u_long cn; 1775 int bnpercn, error, maxio, maxrun, run; 1776 1777 vp = ap->a_vp; 1778 dep = VTODE(vp); 1779 pmp = dep->de_pmp; 1780 if (ap->a_bop != NULL) 1781 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1782 if (ap->a_bnp == NULL) 1783 return (0); 1784 if (ap->a_runp != NULL) 1785 *ap->a_runp = 0; 1786 if (ap->a_runb != NULL) 1787 *ap->a_runb = 0; 1788 cn = ap->a_bn; 1789 if (cn != ap->a_bn) 1790 return (EFBIG); 1791 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1792 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1793 return (error); 1794 1795 /* 1796 * Prepare to back out updates of the fatchain cache after the one 1797 * for the first block done by pcbmap() above. Without the backout, 1798 * then whenever the caller doesn't do i/o to all of the blocks that 1799 * we find, the single useful cache entry would be too far in advance 1800 * of the actual i/o to work for the next sequential i/o. Then the 1801 * FAT would be searched from the beginning. With the backout, the 1802 * FAT is searched starting at most a few blocks early. This wastes 1803 * much less time. Time is also wasted finding more blocks than the 1804 * caller will do i/o to. This is necessary because the runlength 1805 * parameters are output-only. 1806 */ 1807 savefc = dep->de_fc[FC_LASTMAP]; 1808 1809 mp = vp->v_mount; 1810 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1811 bnpercn = de_cn2bn(pmp, 1); 1812 if (ap->a_runp != NULL) { 1813 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1814 for (run = 1; run <= maxrun; run++) { 1815 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1816 runbn != *ap->a_bnp + run * bnpercn) 1817 break; 1818 } 1819 *ap->a_runp = run - 1; 1820 } 1821 if (ap->a_runb != NULL) { 1822 maxrun = ulmin(maxio - 1, cn); 1823 for (run = 1; run < maxrun; run++) { 1824 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1825 runbn != *ap->a_bnp - run * bnpercn) 1826 break; 1827 } 1828 *ap->a_runb = run - 1; 1829 } 1830 dep->de_fc[FC_LASTMAP] = savefc; 1831 return (0); 1832 } 1833 1834 SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1835 "msdos filesystem"); 1836 static int use_buf_pager = 1; 1837 SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, 1838 &use_buf_pager, 0, 1839 "Use buffer pager instead of bmap"); 1840 1841 static daddr_t 1842 msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 1843 { 1844 1845 return (de_cluster(VTODE(vp)->de_pmp, off)); 1846 } 1847 1848 static int 1849 msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz) 1850 { 1851 1852 *sz = VTODE(vp)->de_pmp->pm_bpcluster; 1853 return (0); 1854 } 1855 1856 static int 1857 msdosfs_getpages(struct vop_getpages_args *ap) 1858 { 1859 1860 if (use_buf_pager) 1861 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count, 1862 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno, 1863 msdosfs_gbp_getblksz)); 1864 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count, 1865 ap->a_rbehind, ap->a_rahead, NULL, NULL)); 1866 } 1867 1868 static int 1869 msdosfs_strategy(struct vop_strategy_args *ap) 1870 { 1871 struct buf *bp = ap->a_bp; 1872 struct denode *dep = VTODE(ap->a_vp); 1873 struct bufobj *bo; 1874 int error = 0; 1875 daddr_t blkno; 1876 1877 /* 1878 * If we don't already know the filesystem relative block number 1879 * then get it using pcbmap(). If pcbmap() returns the block 1880 * number as -1 then we've got a hole in the file. DOS filesystems 1881 * don't allow files with holes, so we shouldn't ever see this. 1882 */ 1883 if (bp->b_blkno == bp->b_lblkno) { 1884 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1885 bp->b_blkno = blkno; 1886 if (error) { 1887 bp->b_error = error; 1888 bp->b_ioflags |= BIO_ERROR; 1889 bufdone(bp); 1890 return (0); 1891 } 1892 if ((long)bp->b_blkno == -1) 1893 vfs_bio_clrbuf(bp); 1894 } 1895 if (bp->b_blkno == -1) { 1896 bufdone(bp); 1897 return (0); 1898 } 1899 /* 1900 * Read/write the block from/to the disk that contains the desired 1901 * file block. 1902 */ 1903 bp->b_iooffset = dbtob(bp->b_blkno); 1904 bo = dep->de_pmp->pm_bo; 1905 BO_STRATEGY(bo, bp); 1906 return (0); 1907 } 1908 1909 static int 1910 msdosfs_print(struct vop_print_args *ap) 1911 { 1912 struct denode *dep = VTODE(ap->a_vp); 1913 1914 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1915 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1916 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1917 return (0); 1918 } 1919 1920 static int 1921 msdosfs_pathconf(struct vop_pathconf_args *ap) 1922 { 1923 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1924 1925 switch (ap->a_name) { 1926 case _PC_FILESIZEBITS: 1927 *ap->a_retval = 32; 1928 return (0); 1929 case _PC_LINK_MAX: 1930 *ap->a_retval = 1; 1931 return (0); 1932 case _PC_NAME_MAX: 1933 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1934 return (0); 1935 case _PC_CHOWN_RESTRICTED: 1936 *ap->a_retval = 1; 1937 return (0); 1938 case _PC_NO_TRUNC: 1939 *ap->a_retval = 0; 1940 return (0); 1941 default: 1942 return (vop_stdpathconf(ap)); 1943 } 1944 /* NOTREACHED */ 1945 } 1946 1947 static int 1948 msdosfs_vptofh(struct vop_vptofh_args *ap) 1949 { 1950 struct denode *dep; 1951 struct defid *defhp; 1952 1953 dep = VTODE(ap->a_vp); 1954 defhp = (struct defid *)ap->a_fhp; 1955 defhp->defid_len = sizeof(struct defid); 1956 defhp->defid_dirclust = dep->de_dirclust; 1957 defhp->defid_dirofs = dep->de_diroffset; 1958 /* defhp->defid_gen = dep->de_gen; */ 1959 return (0); 1960 } 1961 1962 /* Global vfs data structures for msdosfs */ 1963 struct vop_vector msdosfs_vnodeops = { 1964 .vop_default = &default_vnodeops, 1965 1966 .vop_access = msdosfs_access, 1967 .vop_bmap = msdosfs_bmap, 1968 .vop_getpages = msdosfs_getpages, 1969 .vop_cachedlookup = msdosfs_lookup, 1970 .vop_open = msdosfs_open, 1971 .vop_close = msdosfs_close, 1972 .vop_create = msdosfs_create, 1973 .vop_fsync = msdosfs_fsync, 1974 .vop_fdatasync = vop_stdfdatasync_buf, 1975 .vop_getattr = msdosfs_getattr, 1976 .vop_inactive = msdosfs_inactive, 1977 .vop_link = msdosfs_link, 1978 .vop_lookup = vfs_cache_lookup, 1979 .vop_mkdir = msdosfs_mkdir, 1980 .vop_mknod = msdosfs_mknod, 1981 .vop_pathconf = msdosfs_pathconf, 1982 .vop_print = msdosfs_print, 1983 .vop_read = msdosfs_read, 1984 .vop_readdir = msdosfs_readdir, 1985 .vop_reclaim = msdosfs_reclaim, 1986 .vop_remove = msdosfs_remove, 1987 .vop_rename = msdosfs_rename, 1988 .vop_rmdir = msdosfs_rmdir, 1989 .vop_setattr = msdosfs_setattr, 1990 .vop_strategy = msdosfs_strategy, 1991 .vop_symlink = msdosfs_symlink, 1992 .vop_write = msdosfs_write, 1993 .vop_vptofh = msdosfs_vptofh, 1994 }; 1995 VFS_VOP_VECTOR_REGISTER(msdosfs_vnodeops);
Cache object: 9b2ec790ceca45352a5ea29f2dedbbce
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