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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, or 131 * only if the SAVESTART bit in cn_flags is clear on success. 132 */ 133 static int 134 msdosfs_create(struct vop_create_args *ap) 135 { 136 struct componentname *cnp = ap->a_cnp; 137 struct denode ndirent; 138 struct denode *dep; 139 struct denode *pdep = VTODE(ap->a_dvp); 140 struct timespec ts; 141 int error; 142 143 #ifdef MSDOSFS_DEBUG 144 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 145 #endif 146 147 /* 148 * If this is the root directory and there is no space left we 149 * can't do anything. This is because the root directory can not 150 * change size. 151 */ 152 if (pdep->de_StartCluster == MSDOSFSROOT 153 && pdep->de_fndoffset >= pdep->de_FileSize) { 154 error = ENOSPC; 155 goto bad; 156 } 157 158 /* 159 * Create a directory entry for the file, then call createde() to 160 * have it installed. NOTE: DOS files are always executable. We 161 * use the absence of the owner write bit to make the file 162 * readonly. 163 */ 164 #ifdef DIAGNOSTIC 165 if ((cnp->cn_flags & HASBUF) == 0) 166 panic("msdosfs_create: no name"); 167 #endif 168 memset(&ndirent, 0, sizeof(ndirent)); 169 error = uniqdosname(pdep, cnp, ndirent.de_Name); 170 if (error) 171 goto bad; 172 173 ndirent.de_Attributes = ATTR_ARCHIVE; 174 ndirent.de_LowerCase = 0; 175 ndirent.de_StartCluster = 0; 176 ndirent.de_FileSize = 0; 177 ndirent.de_pmp = pdep->de_pmp; 178 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 179 vfs_timestamp(&ts); 180 DETIMES(&ndirent, &ts, &ts, &ts); 181 error = createde(&ndirent, pdep, &dep, cnp); 182 if (error) 183 goto bad; 184 *ap->a_vpp = DETOV(dep); 185 if ((cnp->cn_flags & MAKEENTRY) != 0) 186 cache_enter(ap->a_dvp, *ap->a_vpp, cnp); 187 return (0); 188 189 bad: 190 return (error); 191 } 192 193 static int 194 msdosfs_mknod(struct vop_mknod_args *ap) 195 { 196 197 return (EINVAL); 198 } 199 200 static int 201 msdosfs_open(struct vop_open_args *ap) 202 { 203 struct denode *dep = VTODE(ap->a_vp); 204 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 205 return 0; 206 } 207 208 static int 209 msdosfs_close(struct vop_close_args *ap) 210 { 211 struct vnode *vp = ap->a_vp; 212 struct denode *dep = VTODE(vp); 213 struct timespec ts; 214 215 VI_LOCK(vp); 216 if (vp->v_usecount > 1) { 217 vfs_timestamp(&ts); 218 DETIMES(dep, &ts, &ts, &ts); 219 } 220 VI_UNLOCK(vp); 221 return 0; 222 } 223 224 static int 225 msdosfs_access(struct vop_access_args *ap) 226 { 227 struct vnode *vp = ap->a_vp; 228 struct denode *dep = VTODE(ap->a_vp); 229 struct msdosfsmount *pmp = dep->de_pmp; 230 mode_t file_mode; 231 accmode_t accmode = ap->a_accmode; 232 233 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 234 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 235 236 /* 237 * Disallow writing to directories and regular files if the 238 * filesystem is read-only. 239 */ 240 if (accmode & VWRITE) { 241 switch (vp->v_type) { 242 case VREG: 243 case VDIR: 244 if (vp->v_mount->mnt_flag & MNT_RDONLY) 245 return (EROFS); 246 break; 247 default: 248 break; 249 } 250 } 251 252 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 253 ap->a_accmode, ap->a_cred)); 254 } 255 256 static int 257 msdosfs_getattr(struct vop_getattr_args *ap) 258 { 259 struct denode *dep = VTODE(ap->a_vp); 260 struct msdosfsmount *pmp = dep->de_pmp; 261 struct vattr *vap = ap->a_vap; 262 mode_t mode; 263 struct timespec ts; 264 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 265 uint64_t fileid; 266 267 vfs_timestamp(&ts); 268 DETIMES(dep, &ts, &ts, &ts); 269 vap->va_fsid = dev2udev(pmp->pm_dev); 270 /* 271 * The following computation of the fileid must be the same as that 272 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 273 * doesn't work. 274 */ 275 if (dep->de_Attributes & ATTR_DIRECTORY) { 276 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 277 dirsperblk; 278 if (dep->de_StartCluster == MSDOSFSROOT) 279 fileid = 1; 280 } else { 281 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 282 dirsperblk; 283 if (dep->de_dirclust == MSDOSFSROOT) 284 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 285 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 286 } 287 vap->va_fileid = fileid; 288 289 mode = S_IRWXU|S_IRWXG|S_IRWXO; 290 if (dep->de_Attributes & ATTR_READONLY) 291 mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH); 292 vap->va_mode = mode & 293 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 294 vap->va_uid = pmp->pm_uid; 295 vap->va_gid = pmp->pm_gid; 296 vap->va_nlink = 1; 297 vap->va_rdev = NODEV; 298 vap->va_size = dep->de_FileSize; 299 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 300 vap->va_ctime = vap->va_mtime; 301 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 302 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 303 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 304 0, &vap->va_birthtime); 305 } else { 306 vap->va_atime = vap->va_mtime; 307 vap->va_birthtime.tv_sec = -1; 308 vap->va_birthtime.tv_nsec = 0; 309 } 310 vap->va_flags = 0; 311 if (dep->de_Attributes & ATTR_ARCHIVE) 312 vap->va_flags |= UF_ARCHIVE; 313 if (dep->de_Attributes & ATTR_HIDDEN) 314 vap->va_flags |= UF_HIDDEN; 315 if (dep->de_Attributes & ATTR_READONLY) 316 vap->va_flags |= UF_READONLY; 317 if (dep->de_Attributes & ATTR_SYSTEM) 318 vap->va_flags |= UF_SYSTEM; 319 vap->va_gen = 0; 320 vap->va_blocksize = pmp->pm_bpcluster; 321 vap->va_bytes = 322 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 323 vap->va_type = ap->a_vp->v_type; 324 vap->va_filerev = dep->de_modrev; 325 return (0); 326 } 327 328 static int 329 msdosfs_setattr(struct vop_setattr_args *ap) 330 { 331 struct vnode *vp = ap->a_vp; 332 struct denode *dep = VTODE(ap->a_vp); 333 struct msdosfsmount *pmp = dep->de_pmp; 334 struct vattr *vap = ap->a_vap; 335 struct ucred *cred = ap->a_cred; 336 struct thread *td = curthread; 337 int error = 0; 338 339 #ifdef MSDOSFS_DEBUG 340 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 341 ap->a_vp, vap, cred); 342 #endif 343 344 /* 345 * Check for unsettable attributes. 346 */ 347 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 348 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 349 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 350 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 351 #ifdef MSDOSFS_DEBUG 352 printf("msdosfs_setattr(): returning EINVAL\n"); 353 printf(" va_type %d, va_nlink %llx, va_fsid %llx, va_fileid %llx\n", 354 vap->va_type, (unsigned long long)vap->va_nlink, 355 (unsigned long long)vap->va_fsid, 356 (unsigned long long)vap->va_fileid); 357 printf(" va_blocksize %lx, va_rdev %llx, va_bytes %llx, va_gen %lx\n", 358 vap->va_blocksize, (unsigned long long)vap->va_rdev, 359 (unsigned long long)vap->va_bytes, vap->va_gen); 360 printf(" va_uid %x, va_gid %x\n", 361 vap->va_uid, vap->va_gid); 362 #endif 363 return (EINVAL); 364 } 365 366 /* 367 * We don't allow setting attributes on the root directory. 368 * The special case for the root directory is because before 369 * FAT32, the root directory didn't have an entry for itself 370 * (and was otherwise special). With FAT32, the root 371 * directory is not so special, but still doesn't have an 372 * entry for itself. 373 */ 374 if (vp->v_vflag & VV_ROOT) 375 return (EINVAL); 376 377 if (vap->va_flags != VNOVAL) { 378 if (vp->v_mount->mnt_flag & MNT_RDONLY) 379 return (EROFS); 380 if (cred->cr_uid != pmp->pm_uid) { 381 error = priv_check_cred(cred, PRIV_VFS_ADMIN); 382 if (error) 383 return (error); 384 } 385 /* 386 * We are very inconsistent about handling unsupported 387 * attributes. We ignored the access time and the 388 * read and execute bits. We were strict for the other 389 * attributes. 390 */ 391 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY | 392 UF_SYSTEM)) 393 return EOPNOTSUPP; 394 if (vap->va_flags & UF_ARCHIVE) 395 dep->de_Attributes |= ATTR_ARCHIVE; 396 else 397 dep->de_Attributes &= ~ATTR_ARCHIVE; 398 if (vap->va_flags & UF_HIDDEN) 399 dep->de_Attributes |= ATTR_HIDDEN; 400 else 401 dep->de_Attributes &= ~ATTR_HIDDEN; 402 /* We don't allow changing the readonly bit on directories. */ 403 if (vp->v_type != VDIR) { 404 if (vap->va_flags & UF_READONLY) 405 dep->de_Attributes |= ATTR_READONLY; 406 else 407 dep->de_Attributes &= ~ATTR_READONLY; 408 } 409 if (vap->va_flags & UF_SYSTEM) 410 dep->de_Attributes |= ATTR_SYSTEM; 411 else 412 dep->de_Attributes &= ~ATTR_SYSTEM; 413 dep->de_flag |= DE_MODIFIED; 414 } 415 416 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 417 uid_t uid; 418 gid_t gid; 419 420 if (vp->v_mount->mnt_flag & MNT_RDONLY) 421 return (EROFS); 422 uid = vap->va_uid; 423 if (uid == (uid_t)VNOVAL) 424 uid = pmp->pm_uid; 425 gid = vap->va_gid; 426 if (gid == (gid_t)VNOVAL) 427 gid = pmp->pm_gid; 428 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 429 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 430 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 431 if (error) 432 return (error); 433 } 434 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 435 return EINVAL; 436 } 437 438 if (vap->va_size != VNOVAL) { 439 switch (vp->v_type) { 440 case VDIR: 441 return (EISDIR); 442 case VREG: 443 /* 444 * Truncation is only supported for regular files, 445 * Disallow it if the filesystem is read-only. 446 */ 447 if (vp->v_mount->mnt_flag & MNT_RDONLY) 448 return (EROFS); 449 break; 450 default: 451 /* 452 * According to POSIX, the result is unspecified 453 * for file types other than regular files, 454 * directories and shared memory objects. We 455 * don't support any file types except regular 456 * files and directories in this file system, so 457 * this (default) case is unreachable and can do 458 * anything. Keep falling through to detrunc() 459 * for now. 460 */ 461 break; 462 } 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; 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 ((uoff_t)uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX) 665 return (EFBIG); 666 667 /* 668 * If they've exceeded their filesize limit, tell them about it. 669 */ 670 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 671 return (EFBIG); 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) 682 return (error); 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, bp, dep->de_FileSize, 800 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 return (error); 826 } 827 828 /* 829 * Flush the blocks of a file to disk. 830 */ 831 static int 832 msdosfs_fsync(struct vop_fsync_args *ap) 833 { 834 struct vnode *devvp; 835 int allerror, error; 836 837 vop_stdfsync(ap); 838 839 /* 840 * If the syncing request comes from fsync(2), sync the entire 841 * FAT and any other metadata that happens to be on devvp. We 842 * need this mainly for the FAT. We write the FAT sloppily, and 843 * syncing it all now is the best we can easily do to get all 844 * directory entries associated with the file (not just the file) 845 * fully synced. The other metadata includes critical metadata 846 * for all directory entries, but only in the MNT_ASYNC case. We 847 * will soon sync all metadata in the file's directory entry. 848 * Non-critical metadata for associated directory entries only 849 * gets synced accidentally, as in most file systems. 850 */ 851 if (ap->a_waitfor != MNT_NOWAIT) { 852 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 853 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 854 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 855 VOP_UNLOCK(devvp); 856 } else 857 allerror = 0; 858 859 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor != MNT_NOWAIT); 860 if (allerror == 0) 861 allerror = error; 862 return (allerror); 863 } 864 865 static int 866 msdosfs_remove(struct vop_remove_args *ap) 867 { 868 struct denode *dep = VTODE(ap->a_vp); 869 struct denode *ddep = VTODE(ap->a_dvp); 870 int error; 871 872 if (ap->a_vp->v_type == VDIR) 873 error = EPERM; 874 else 875 error = removede(ddep, dep); 876 #ifdef MSDOSFS_DEBUG 877 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 878 #endif 879 return (error); 880 } 881 882 /* 883 * DOS filesystems don't know what links are. 884 */ 885 static int 886 msdosfs_link(struct vop_link_args *ap) 887 { 888 return (EOPNOTSUPP); 889 } 890 891 /* 892 * Renames on files require moving the denode to a new hash queue since the 893 * denode's location is used to compute which hash queue to put the file 894 * in. Unless it is a rename in place. For example "mv a b". 895 * 896 * What follows is the basic algorithm: 897 * 898 * if (file move) { 899 * if (dest file exists) { 900 * remove dest file 901 * } 902 * if (dest and src in same directory) { 903 * rewrite name in existing directory slot 904 * } else { 905 * write new entry in dest directory 906 * update offset and dirclust in denode 907 * move denode to new hash chain 908 * clear old directory entry 909 * } 910 * } else { 911 * directory move 912 * if (dest directory exists) { 913 * if (dest is not empty) { 914 * return ENOTEMPTY 915 * } 916 * remove dest directory 917 * } 918 * if (dest and src in same directory) { 919 * rewrite name in existing entry 920 * } else { 921 * be sure dest is not a child of src directory 922 * write entry in dest directory 923 * update "." and ".." in moved directory 924 * clear old directory entry for moved directory 925 * } 926 * } 927 * 928 * On entry: 929 * source's parent directory is unlocked 930 * source file or directory is unlocked 931 * destination's parent directory is locked 932 * destination file or directory is locked if it exists 933 * 934 * On exit: 935 * all denodes should be released 936 */ 937 static int 938 msdosfs_rename(struct vop_rename_args *ap) 939 { 940 struct vnode *fdvp, *fvp, *tdvp, *tvp, *vp; 941 struct componentname *fcnp, *tcnp; 942 struct denode *fdip, *fip, *tdip, *tip, *nip; 943 u_char toname[12], oldname[11]; 944 u_long to_diroffset; 945 bool checkpath_locked, doingdirectory, newparent; 946 int error; 947 u_long cn, pcl, blkoff; 948 daddr_t bn, wait_scn, scn; 949 struct msdosfsmount *pmp; 950 struct direntry *dotdotp; 951 struct buf *bp; 952 953 tdvp = ap->a_tdvp; 954 fvp = ap->a_fvp; 955 fdvp = ap->a_fdvp; 956 tvp = ap->a_tvp; 957 tcnp = ap->a_tcnp; 958 fcnp = ap->a_fcnp; 959 pmp = VFSTOMSDOSFS(fdvp->v_mount); 960 961 #ifdef DIAGNOSTIC 962 if ((tcnp->cn_flags & HASBUF) == 0 || 963 (fcnp->cn_flags & HASBUF) == 0) 964 panic("msdosfs_rename: no name"); 965 #endif 966 /* 967 * Check for cross-device rename. 968 */ 969 if (fvp->v_mount != tdvp->v_mount || 970 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 971 error = EXDEV; 972 goto abortit; 973 } 974 975 /* 976 * If source and dest are the same, do nothing. 977 */ 978 if (tvp == fvp) { 979 error = 0; 980 goto abortit; 981 } 982 983 /* 984 * When the target exists, both the directory 985 * and target vnodes are passed locked. 986 */ 987 VOP_UNLOCK(tdvp); 988 if (tvp != NULL && tvp != tdvp) 989 VOP_UNLOCK(tvp); 990 991 checkpath_locked = false; 992 993 relock: 994 doingdirectory = newparent = false; 995 996 error = vn_lock(fdvp, LK_EXCLUSIVE); 997 if (error != 0) 998 goto releout; 999 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1000 VOP_UNLOCK(fdvp); 1001 error = vn_lock(tdvp, LK_EXCLUSIVE); 1002 if (error != 0) 1003 goto releout; 1004 VOP_UNLOCK(tdvp); 1005 goto relock; 1006 } 1007 1008 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1009 if (error != 0) { 1010 VOP_UNLOCK(fdvp); 1011 VOP_UNLOCK(tdvp); 1012 goto releout; 1013 } 1014 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, &nip); 1015 if (error != 0) { 1016 VOP_UNLOCK(fdvp); 1017 VOP_UNLOCK(tdvp); 1018 if (error != EBUSY) 1019 goto releout; 1020 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, &nip); 1021 if (error != 0) 1022 goto releout; 1023 vp = fvp; 1024 fvp = DETOV(nip); 1025 VOP_UNLOCK(fvp); 1026 vrele(vp); 1027 goto relock; 1028 } 1029 vrele(fvp); 1030 fvp = DETOV(nip); 1031 1032 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1033 if (error != 0 && error != EJUSTRETURN) { 1034 VOP_UNLOCK(fdvp); 1035 VOP_UNLOCK(tdvp); 1036 VOP_UNLOCK(fvp); 1037 goto releout; 1038 } 1039 if (error == EJUSTRETURN && tvp != NULL) { 1040 vrele(tvp); 1041 tvp = NULL; 1042 } 1043 if (error == 0) { 1044 nip = NULL; 1045 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, 1046 &nip); 1047 if (tvp != NULL) { 1048 vrele(tvp); 1049 tvp = NULL; 1050 } 1051 if (error != 0) { 1052 VOP_UNLOCK(fdvp); 1053 VOP_UNLOCK(tdvp); 1054 VOP_UNLOCK(fvp); 1055 if (error != EBUSY) 1056 goto releout; 1057 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, 1058 &nip); 1059 if (error != 0) 1060 goto releout; 1061 vput(DETOV(nip)); 1062 goto relock; 1063 } 1064 tvp = DETOV(nip); 1065 } 1066 1067 fdip = VTODE(fdvp); 1068 fip = VTODE(fvp); 1069 tdip = VTODE(tdvp); 1070 tip = tvp != NULL ? VTODE(tvp) : NULL; 1071 1072 /* 1073 * Remember direntry place to use for destination 1074 */ 1075 to_diroffset = tdip->de_fndoffset; 1076 1077 /* 1078 * Be sure we are not renaming ".", "..", or an alias of ".". This 1079 * leads to a crippled directory tree. It's pretty tough to do a 1080 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1081 * doesn't work if the ".." entry is missing. 1082 */ 1083 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) { 1084 /* 1085 * Avoid ".", "..", and aliases of "." for obvious reasons. 1086 */ 1087 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1088 fdip == fip || 1089 (fcnp->cn_flags & ISDOTDOT) != 0 || 1090 (tcnp->cn_flags & ISDOTDOT) != 0) { 1091 error = EINVAL; 1092 goto unlock; 1093 } 1094 doingdirectory = true; 1095 } 1096 1097 /* 1098 * If ".." must be changed (ie the directory gets a new 1099 * parent) then the source directory must not be in the 1100 * directory hierarchy above the target, as this would 1101 * orphan everything below the source directory. Also 1102 * the user must have write permission in the source so 1103 * as to be able to change "..". We must repeat the call 1104 * to namei, as the parent directory is unlocked by the 1105 * call to doscheckpath(). 1106 */ 1107 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1108 if (fdip->de_StartCluster != tdip->de_StartCluster) 1109 newparent = true; 1110 if (doingdirectory && newparent) { 1111 if (error != 0) /* write access check above */ 1112 goto unlock; 1113 lockmgr(&pmp->pm_checkpath_lock, LK_EXCLUSIVE, NULL); 1114 checkpath_locked = true; 1115 error = doscheckpath(fip, tdip, &wait_scn); 1116 if (wait_scn != 0) { 1117 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1118 checkpath_locked = false; 1119 VOP_UNLOCK(fdvp); 1120 VOP_UNLOCK(tdvp); 1121 VOP_UNLOCK(fvp); 1122 if (tvp != NULL && tvp != tdvp) 1123 VOP_UNLOCK(tvp); 1124 error = deget(pmp, wait_scn, 0, LK_EXCLUSIVE, 1125 &nip); 1126 if (error == 0) { 1127 vput(DETOV(nip)); 1128 goto relock; 1129 } 1130 } 1131 if (error != 0) 1132 goto unlock; 1133 if ((tcnp->cn_flags & SAVESTART) == 0) 1134 panic("msdosfs_rename: lost to startdir"); 1135 } 1136 1137 if (tip != NULL) { 1138 /* 1139 * Target must be empty if a directory and have no links 1140 * to it. Also, ensure source and target are compatible 1141 * (both directories, or both not directories). 1142 */ 1143 if ((tip->de_Attributes & ATTR_DIRECTORY) != 0) { 1144 if (!dosdirempty(tip)) { 1145 error = ENOTEMPTY; 1146 goto unlock; 1147 } 1148 if (!doingdirectory) { 1149 error = ENOTDIR; 1150 goto unlock; 1151 } 1152 cache_purge(tdvp); 1153 } else if (doingdirectory) { 1154 error = EISDIR; 1155 goto unlock; 1156 } 1157 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1158 MPASS(error == 0); 1159 error = removede(tdip, tip); 1160 if (error != 0) 1161 goto unlock; 1162 vput(tvp); 1163 tvp = NULL; 1164 tip = NULL; 1165 } 1166 1167 /* 1168 * Convert the filename in tcnp into a dos filename. We copy this 1169 * into the denode and directory entry for the destination 1170 * file/directory. 1171 */ 1172 error = uniqdosname(tdip, tcnp, toname); 1173 if (error != 0) 1174 goto unlock; 1175 1176 /* 1177 * First write a new entry in the destination 1178 * directory and mark the entry in the source directory 1179 * as deleted. Then move the denode to the correct hash 1180 * chain for its new location in the filesystem. And, if 1181 * we moved a directory, then update its .. entry to point 1182 * to the new parent directory. 1183 */ 1184 memcpy(oldname, fip->de_Name, 11); 1185 memcpy(fip->de_Name, toname, 11); /* update denode */ 1186 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1187 MPASS(error == EJUSTRETURN); 1188 error = createde(fip, tdip, NULL, tcnp); 1189 if (error != 0) { 1190 memcpy(fip->de_Name, oldname, 11); 1191 goto unlock; 1192 } 1193 1194 /* 1195 * If fip is for a directory, then its name should always 1196 * be "." since it is for the directory entry in the 1197 * directory itself (msdosfs_lookup() always translates 1198 * to the "." entry so as to get a unique denode, except 1199 * for the root directory there are different 1200 * complications). However, we just corrupted its name 1201 * to pass the correct name to createde(). Undo this. 1202 */ 1203 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) 1204 memcpy(fip->de_Name, oldname, 11); 1205 fip->de_refcnt++; 1206 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1207 MPASS(error == 0); 1208 error = removede(fdip, fip); 1209 if (error != 0) { 1210 /* XXX should downgrade to ro here, fs is corrupt */ 1211 goto unlock; 1212 } 1213 if (!doingdirectory) { 1214 error = pcbmap(tdip, de_cluster(pmp, to_diroffset), 0, 1215 &fip->de_dirclust, 0); 1216 if (error != 0) { 1217 /* 1218 * XXX should downgrade to ro here, 1219 * fs is corrupt 1220 */ 1221 goto unlock; 1222 } 1223 if (fip->de_dirclust == MSDOSFSROOT) 1224 fip->de_diroffset = to_diroffset; 1225 else 1226 fip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1227 } 1228 reinsert(fip); 1229 1230 /* 1231 * If we moved a directory to a new parent directory, then we must 1232 * fixup the ".." entry in the moved directory. 1233 */ 1234 if (doingdirectory && newparent) { 1235 cn = fip->de_StartCluster; 1236 if (cn == MSDOSFSROOT) { 1237 /* this should never happen */ 1238 panic("msdosfs_rename(): updating .. in root directory?"); 1239 } else 1240 bn = cntobn(pmp, cn); 1241 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1242 NOCRED, &bp); 1243 if (error != 0) { 1244 /* XXX should downgrade to ro here, fs is corrupt */ 1245 goto unlock; 1246 } 1247 dotdotp = (struct direntry *)bp->b_data + 1; 1248 pcl = tdip->de_StartCluster; 1249 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1250 pcl = MSDOSFSROOT; 1251 putushort(dotdotp->deStartCluster, pcl); 1252 if (FAT32(pmp)) 1253 putushort(dotdotp->deHighClust, pcl >> 16); 1254 if (DOINGASYNC(fvp)) 1255 bdwrite(bp); 1256 else if ((error = bwrite(bp)) != 0) { 1257 /* XXX should downgrade to ro here, fs is corrupt */ 1258 goto unlock; 1259 } 1260 } 1261 1262 /* 1263 * The msdosfs lookup is case insensitive. Several aliases may 1264 * be inserted for a single directory entry. As a consequnce, 1265 * name cache purge done by lookup for fvp when DELETE op for 1266 * namei is specified, might be not enough to expunge all 1267 * namecache entries that were installed for this direntry. 1268 */ 1269 cache_purge(fvp); 1270 1271 unlock: 1272 if (checkpath_locked) 1273 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1274 vput(fdvp); 1275 vput(fvp); 1276 if (tvp != NULL) { 1277 if (tvp != tdvp) 1278 vput(tvp); 1279 else 1280 vrele(tvp); 1281 } 1282 vput(tdvp); 1283 return (error); 1284 releout: 1285 MPASS(!checkpath_locked); 1286 vrele(tdvp); 1287 if (tvp != NULL) 1288 vrele(tvp); 1289 vrele(fdvp); 1290 vrele(fvp); 1291 return (error); 1292 abortit: 1293 if (tdvp == tvp) 1294 vrele(tdvp); 1295 else 1296 vput(tdvp); 1297 if (tvp != NULL) 1298 vput(tvp); 1299 vrele(fdvp); 1300 vrele(fvp); 1301 return (error); 1302 } 1303 1304 static struct { 1305 struct direntry dot; 1306 struct direntry dotdot; 1307 } dosdirtemplate = { 1308 { ". ", /* the . entry */ 1309 ATTR_DIRECTORY, /* file attribute */ 1310 0, /* reserved */ 1311 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1312 { 0, 0 }, /* access date */ 1313 { 0, 0 }, /* high bits of start cluster */ 1314 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1315 { 0, 0 }, /* startcluster */ 1316 { 0, 0, 0, 0 } /* filesize */ 1317 }, 1318 { ".. ", /* the .. entry */ 1319 ATTR_DIRECTORY, /* file attribute */ 1320 0, /* reserved */ 1321 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1322 { 0, 0 }, /* access date */ 1323 { 0, 0 }, /* high bits of start cluster */ 1324 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1325 { 0, 0 }, /* startcluster */ 1326 { 0, 0, 0, 0 } /* filesize */ 1327 } 1328 }; 1329 1330 static int 1331 msdosfs_mkdir(struct vop_mkdir_args *ap) 1332 { 1333 struct componentname *cnp = ap->a_cnp; 1334 struct denode *dep; 1335 struct denode *pdep = VTODE(ap->a_dvp); 1336 struct direntry *denp; 1337 struct msdosfsmount *pmp = pdep->de_pmp; 1338 struct buf *bp; 1339 u_long newcluster, pcl; 1340 int bn; 1341 int error; 1342 struct denode ndirent; 1343 struct timespec ts; 1344 1345 /* 1346 * If this is the root directory and there is no space left we 1347 * can't do anything. This is because the root directory can not 1348 * change size. 1349 */ 1350 if (pdep->de_StartCluster == MSDOSFSROOT 1351 && pdep->de_fndoffset >= pdep->de_FileSize) { 1352 error = ENOSPC; 1353 goto bad2; 1354 } 1355 1356 /* 1357 * Allocate a cluster to hold the about to be created directory. 1358 */ 1359 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1360 if (error) 1361 goto bad2; 1362 1363 memset(&ndirent, 0, sizeof(ndirent)); 1364 ndirent.de_pmp = pmp; 1365 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1366 vfs_timestamp(&ts); 1367 DETIMES(&ndirent, &ts, &ts, &ts); 1368 1369 /* 1370 * Now fill the cluster with the "." and ".." entries. And write 1371 * the cluster to disk. This way it is there for the parent 1372 * directory to be pointing at if there were a crash. 1373 */ 1374 bn = cntobn(pmp, newcluster); 1375 /* always succeeds */ 1376 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1377 memset(bp->b_data, 0, pmp->pm_bpcluster); 1378 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1379 denp = (struct direntry *)bp->b_data; 1380 putushort(denp[0].deStartCluster, newcluster); 1381 putushort(denp[0].deCDate, ndirent.de_CDate); 1382 putushort(denp[0].deCTime, ndirent.de_CTime); 1383 denp[0].deCHundredth = ndirent.de_CHun; 1384 putushort(denp[0].deADate, ndirent.de_ADate); 1385 putushort(denp[0].deMDate, ndirent.de_MDate); 1386 putushort(denp[0].deMTime, ndirent.de_MTime); 1387 pcl = pdep->de_StartCluster; 1388 /* 1389 * Although the root directory has a non-magic starting cluster 1390 * number for FAT32, chkdsk and fsck_msdosfs still require 1391 * references to it in dotdot entries to be magic. 1392 */ 1393 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1394 pcl = MSDOSFSROOT; 1395 putushort(denp[1].deStartCluster, pcl); 1396 putushort(denp[1].deCDate, ndirent.de_CDate); 1397 putushort(denp[1].deCTime, ndirent.de_CTime); 1398 denp[1].deCHundredth = ndirent.de_CHun; 1399 putushort(denp[1].deADate, ndirent.de_ADate); 1400 putushort(denp[1].deMDate, ndirent.de_MDate); 1401 putushort(denp[1].deMTime, ndirent.de_MTime); 1402 if (FAT32(pmp)) { 1403 putushort(denp[0].deHighClust, newcluster >> 16); 1404 putushort(denp[1].deHighClust, pcl >> 16); 1405 } 1406 1407 if (DOINGASYNC(ap->a_dvp)) 1408 bdwrite(bp); 1409 else if ((error = bwrite(bp)) != 0) 1410 goto bad; 1411 1412 /* 1413 * Now build up a directory entry pointing to the newly allocated 1414 * cluster. This will be written to an empty slot in the parent 1415 * directory. 1416 */ 1417 #ifdef DIAGNOSTIC 1418 if ((cnp->cn_flags & HASBUF) == 0) 1419 panic("msdosfs_mkdir: no name"); 1420 #endif 1421 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1422 if (error) 1423 goto bad; 1424 1425 ndirent.de_Attributes = ATTR_DIRECTORY; 1426 ndirent.de_LowerCase = 0; 1427 ndirent.de_StartCluster = newcluster; 1428 ndirent.de_FileSize = 0; 1429 error = createde(&ndirent, pdep, &dep, cnp); 1430 if (error) 1431 goto bad; 1432 *ap->a_vpp = DETOV(dep); 1433 return (0); 1434 1435 bad: 1436 clusterfree(pmp, newcluster, NULL); 1437 bad2: 1438 return (error); 1439 } 1440 1441 static int 1442 msdosfs_rmdir(struct vop_rmdir_args *ap) 1443 { 1444 struct vnode *vp = ap->a_vp; 1445 struct vnode *dvp = ap->a_dvp; 1446 struct componentname *cnp = ap->a_cnp; 1447 struct denode *ip, *dp; 1448 int error; 1449 1450 ip = VTODE(vp); 1451 dp = VTODE(dvp); 1452 1453 /* 1454 * Verify the directory is empty (and valid). 1455 * (Rmdir ".." won't be valid since 1456 * ".." will contain a reference to 1457 * the current directory and thus be 1458 * non-empty.) 1459 */ 1460 error = 0; 1461 if (!dosdirempty(ip)) { 1462 error = ENOTEMPTY; 1463 goto out; 1464 } 1465 /* 1466 * Delete the entry from the directory. For dos filesystems this 1467 * gets rid of the directory entry on disk, the in memory copy 1468 * still exists but the de_refcnt is <= 0. This prevents it from 1469 * being found by deget(). When the vput() on dep is done we give 1470 * up access and eventually msdosfs_reclaim() will be called which 1471 * will remove it from the denode cache. 1472 */ 1473 error = removede(dp, ip); 1474 if (error) 1475 goto out; 1476 /* 1477 * This is where we decrement the link count in the parent 1478 * directory. Since dos filesystems don't do this we just purge 1479 * the name cache. 1480 */ 1481 cache_purge(dvp); 1482 /* 1483 * Truncate the directory that is being deleted. 1484 */ 1485 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1486 cache_purge(vp); 1487 1488 out: 1489 return (error); 1490 } 1491 1492 /* 1493 * DOS filesystems don't know what symlinks are. 1494 */ 1495 static int 1496 msdosfs_symlink(struct vop_symlink_args *ap) 1497 { 1498 return (EOPNOTSUPP); 1499 } 1500 1501 static int 1502 msdosfs_readdir(struct vop_readdir_args *ap) 1503 { 1504 struct mbnambuf nb; 1505 int error = 0; 1506 int diff; 1507 long n; 1508 int blsize; 1509 long on; 1510 u_long cn; 1511 u_long dirsperblk; 1512 long bias = 0; 1513 daddr_t bn, lbn; 1514 struct buf *bp; 1515 struct denode *dep = VTODE(ap->a_vp); 1516 struct msdosfsmount *pmp = dep->de_pmp; 1517 struct direntry *dentp; 1518 struct dirent dirbuf; 1519 struct uio *uio = ap->a_uio; 1520 u_long *cookies = NULL; 1521 int ncookies = 0; 1522 off_t offset, off; 1523 int chksum = -1; 1524 1525 #ifdef MSDOSFS_DEBUG 1526 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1527 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1528 #endif 1529 1530 /* 1531 * msdosfs_readdir() won't operate properly on regular files since 1532 * it does i/o only with the filesystem vnode, and hence can 1533 * retrieve the wrong block from the buffer cache for a plain file. 1534 * So, fail attempts to readdir() on a plain file. 1535 */ 1536 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1537 return (ENOTDIR); 1538 1539 /* 1540 * To be safe, initialize dirbuf 1541 */ 1542 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name)); 1543 1544 /* 1545 * If the user buffer is smaller than the size of one dos directory 1546 * entry or the file offset is not a multiple of the size of a 1547 * directory entry, then we fail the read. 1548 */ 1549 off = offset = uio->uio_offset; 1550 if (uio->uio_resid < sizeof(struct direntry) || 1551 (offset & (sizeof(struct direntry) - 1))) 1552 return (EINVAL); 1553 1554 if (ap->a_ncookies) { 1555 ncookies = uio->uio_resid / 16; 1556 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1557 M_WAITOK); 1558 *ap->a_cookies = cookies; 1559 *ap->a_ncookies = ncookies; 1560 } 1561 1562 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1563 1564 /* 1565 * If they are reading from the root directory then, we simulate 1566 * the . and .. entries since these don't exist in the root 1567 * directory. We also set the offset bias to make up for having to 1568 * simulate these entries. By this I mean that at file offset 64 we 1569 * read the first entry in the root directory that lives on disk. 1570 */ 1571 if (dep->de_StartCluster == MSDOSFSROOT 1572 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1573 #if 0 1574 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1575 offset); 1576 #endif 1577 bias = 2 * sizeof(struct direntry); 1578 if (offset < bias) { 1579 for (n = (int)offset / sizeof(struct direntry); 1580 n < 2; n++) { 1581 dirbuf.d_fileno = FAT32(pmp) ? 1582 (uint64_t)cntobn(pmp, pmp->pm_rootdirblk) * 1583 dirsperblk : 1; 1584 dirbuf.d_type = DT_DIR; 1585 switch (n) { 1586 case 0: 1587 dirbuf.d_namlen = 1; 1588 dirbuf.d_name[0] = '.'; 1589 break; 1590 case 1: 1591 dirbuf.d_namlen = 2; 1592 dirbuf.d_name[0] = '.'; 1593 dirbuf.d_name[1] = '.'; 1594 break; 1595 } 1596 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1597 /* NOTE: d_off is the offset of the *next* entry. */ 1598 dirbuf.d_off = offset + sizeof(struct direntry); 1599 dirent_terminate(&dirbuf); 1600 if (uio->uio_resid < dirbuf.d_reclen) 1601 goto out; 1602 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1603 if (error) 1604 goto out; 1605 offset += sizeof(struct direntry); 1606 off = offset; 1607 if (cookies) { 1608 *cookies++ = offset; 1609 if (--ncookies <= 0) 1610 goto out; 1611 } 1612 } 1613 } 1614 } 1615 1616 mbnambuf_init(&nb); 1617 off = offset; 1618 while (uio->uio_resid > 0) { 1619 lbn = de_cluster(pmp, offset - bias); 1620 on = (offset - bias) & pmp->pm_crbomask; 1621 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1622 diff = dep->de_FileSize - (offset - bias); 1623 if (diff <= 0) 1624 break; 1625 n = min(n, diff); 1626 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1627 if (error) 1628 break; 1629 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1630 if (error) { 1631 return (error); 1632 } 1633 n = min(n, blsize - bp->b_resid); 1634 if (n == 0) { 1635 brelse(bp); 1636 return (EIO); 1637 } 1638 1639 /* 1640 * Convert from dos directory entries to fs-independent 1641 * directory entries. 1642 */ 1643 for (dentp = (struct direntry *)(bp->b_data + on); 1644 (char *)dentp < bp->b_data + on + n; 1645 dentp++, offset += sizeof(struct direntry)) { 1646 #if 0 1647 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1648 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1649 #endif 1650 /* 1651 * If this is an unused entry, we can stop. 1652 */ 1653 if (dentp->deName[0] == SLOT_EMPTY) { 1654 brelse(bp); 1655 goto out; 1656 } 1657 /* 1658 * Skip deleted entries. 1659 */ 1660 if (dentp->deName[0] == SLOT_DELETED) { 1661 chksum = -1; 1662 mbnambuf_init(&nb); 1663 continue; 1664 } 1665 1666 /* 1667 * Handle Win95 long directory entries 1668 */ 1669 if (dentp->deAttributes == ATTR_WIN95) { 1670 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1671 continue; 1672 chksum = win2unixfn(&nb, 1673 (struct winentry *)dentp, chksum, pmp); 1674 continue; 1675 } 1676 1677 /* 1678 * Skip volume labels 1679 */ 1680 if (dentp->deAttributes & ATTR_VOLUME) { 1681 chksum = -1; 1682 mbnambuf_init(&nb); 1683 continue; 1684 } 1685 /* 1686 * This computation of d_fileno must match 1687 * the computation of va_fileid in 1688 * msdosfs_getattr. 1689 */ 1690 if (dentp->deAttributes & ATTR_DIRECTORY) { 1691 cn = getushort(dentp->deStartCluster); 1692 if (FAT32(pmp)) { 1693 cn |= getushort(dentp->deHighClust) << 1694 16; 1695 if (cn == MSDOSFSROOT) 1696 cn = pmp->pm_rootdirblk; 1697 } 1698 if (cn == MSDOSFSROOT && !FAT32(pmp)) 1699 dirbuf.d_fileno = 1; 1700 else 1701 dirbuf.d_fileno = cntobn(pmp, cn) * 1702 dirsperblk; 1703 dirbuf.d_type = DT_DIR; 1704 } else { 1705 dirbuf.d_fileno = (uoff_t)offset / 1706 sizeof(struct direntry); 1707 dirbuf.d_type = DT_REG; 1708 } 1709 1710 if (chksum != winChksum(dentp->deName)) { 1711 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1712 (u_char *)dirbuf.d_name, 1713 dentp->deLowerCase | 1714 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1715 (LCASE_BASE | LCASE_EXT) : 0), 1716 pmp); 1717 mbnambuf_init(&nb); 1718 } else 1719 mbnambuf_flush(&nb, &dirbuf); 1720 chksum = -1; 1721 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1722 /* NOTE: d_off is the offset of the *next* entry. */ 1723 dirbuf.d_off = offset + sizeof(struct direntry); 1724 dirent_terminate(&dirbuf); 1725 if (uio->uio_resid < dirbuf.d_reclen) { 1726 brelse(bp); 1727 goto out; 1728 } 1729 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1730 if (error) { 1731 brelse(bp); 1732 goto out; 1733 } 1734 if (cookies) { 1735 *cookies++ = offset + sizeof(struct direntry); 1736 if (--ncookies <= 0) { 1737 brelse(bp); 1738 goto out; 1739 } 1740 } 1741 off = offset + sizeof(struct direntry); 1742 } 1743 brelse(bp); 1744 } 1745 out: 1746 /* Subtract unused cookies */ 1747 if (ap->a_ncookies) 1748 *ap->a_ncookies -= ncookies; 1749 1750 uio->uio_offset = off; 1751 1752 /* 1753 * Set the eofflag (NFS uses it) 1754 */ 1755 if (ap->a_eofflag) { 1756 if (dep->de_FileSize - (offset - bias) <= 0) 1757 *ap->a_eofflag = 1; 1758 else 1759 *ap->a_eofflag = 0; 1760 } 1761 return (error); 1762 } 1763 1764 /*- 1765 * a_vp - pointer to the file's vnode 1766 * a_bn - logical block number within the file (cluster number for us) 1767 * a_bop - where to return the bufobj of the special file containing the fs 1768 * a_bnp - where to return the "physical" block number corresponding to a_bn 1769 * (relative to the special file; units are blocks of size DEV_BSIZE) 1770 * a_runp - where to return the "run past" a_bn. This is the count of logical 1771 * blocks whose physical blocks (together with a_bn's physical block) 1772 * are contiguous. 1773 * a_runb - where to return the "run before" a_bn. 1774 */ 1775 static int 1776 msdosfs_bmap(struct vop_bmap_args *ap) 1777 { 1778 struct fatcache savefc; 1779 struct denode *dep; 1780 struct mount *mp; 1781 struct msdosfsmount *pmp; 1782 struct vnode *vp; 1783 daddr_t runbn; 1784 u_long cn; 1785 int bnpercn, error, maxio, maxrun, run; 1786 1787 vp = ap->a_vp; 1788 dep = VTODE(vp); 1789 pmp = dep->de_pmp; 1790 if (ap->a_bop != NULL) 1791 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1792 if (ap->a_bnp == NULL) 1793 return (0); 1794 if (ap->a_runp != NULL) 1795 *ap->a_runp = 0; 1796 if (ap->a_runb != NULL) 1797 *ap->a_runb = 0; 1798 cn = ap->a_bn; 1799 if (cn != ap->a_bn) 1800 return (EFBIG); 1801 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1802 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1803 return (error); 1804 1805 /* 1806 * Prepare to back out updates of the fatchain cache after the one 1807 * for the first block done by pcbmap() above. Without the backout, 1808 * then whenever the caller doesn't do i/o to all of the blocks that 1809 * we find, the single useful cache entry would be too far in advance 1810 * of the actual i/o to work for the next sequential i/o. Then the 1811 * FAT would be searched from the beginning. With the backout, the 1812 * FAT is searched starting at most a few blocks early. This wastes 1813 * much less time. Time is also wasted finding more blocks than the 1814 * caller will do i/o to. This is necessary because the runlength 1815 * parameters are output-only. 1816 */ 1817 savefc = dep->de_fc[FC_LASTMAP]; 1818 1819 mp = vp->v_mount; 1820 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1821 bnpercn = de_cn2bn(pmp, 1); 1822 if (ap->a_runp != NULL) { 1823 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1824 for (run = 1; run <= maxrun; run++) { 1825 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1826 runbn != *ap->a_bnp + run * bnpercn) 1827 break; 1828 } 1829 *ap->a_runp = run - 1; 1830 } 1831 if (ap->a_runb != NULL) { 1832 maxrun = ulmin(maxio - 1, cn); 1833 for (run = 1; run < maxrun; run++) { 1834 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1835 runbn != *ap->a_bnp - run * bnpercn) 1836 break; 1837 } 1838 *ap->a_runb = run - 1; 1839 } 1840 dep->de_fc[FC_LASTMAP] = savefc; 1841 return (0); 1842 } 1843 1844 SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1845 "msdos filesystem"); 1846 static int use_buf_pager = 1; 1847 SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, 1848 &use_buf_pager, 0, 1849 "Use buffer pager instead of bmap"); 1850 1851 static daddr_t 1852 msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 1853 { 1854 1855 return (de_cluster(VTODE(vp)->de_pmp, off)); 1856 } 1857 1858 static int 1859 msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz) 1860 { 1861 1862 *sz = VTODE(vp)->de_pmp->pm_bpcluster; 1863 return (0); 1864 } 1865 1866 static int 1867 msdosfs_getpages(struct vop_getpages_args *ap) 1868 { 1869 1870 if (use_buf_pager) 1871 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count, 1872 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno, 1873 msdosfs_gbp_getblksz)); 1874 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count, 1875 ap->a_rbehind, ap->a_rahead, NULL, NULL)); 1876 } 1877 1878 static int 1879 msdosfs_strategy(struct vop_strategy_args *ap) 1880 { 1881 struct buf *bp = ap->a_bp; 1882 struct denode *dep = VTODE(ap->a_vp); 1883 struct bufobj *bo; 1884 int error = 0; 1885 daddr_t blkno; 1886 1887 /* 1888 * If we don't already know the filesystem relative block number 1889 * then get it using pcbmap(). If pcbmap() returns the block 1890 * number as -1 then we've got a hole in the file. DOS filesystems 1891 * don't allow files with holes, so we shouldn't ever see this. 1892 */ 1893 if (bp->b_blkno == bp->b_lblkno) { 1894 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1895 bp->b_blkno = blkno; 1896 if (error) { 1897 bp->b_error = error; 1898 bp->b_ioflags |= BIO_ERROR; 1899 bufdone(bp); 1900 return (0); 1901 } 1902 if ((long)bp->b_blkno == -1) 1903 vfs_bio_clrbuf(bp); 1904 } 1905 if (bp->b_blkno == -1) { 1906 bufdone(bp); 1907 return (0); 1908 } 1909 /* 1910 * Read/write the block from/to the disk that contains the desired 1911 * file block. 1912 */ 1913 bp->b_iooffset = dbtob(bp->b_blkno); 1914 bo = dep->de_pmp->pm_bo; 1915 BO_STRATEGY(bo, bp); 1916 return (0); 1917 } 1918 1919 static int 1920 msdosfs_print(struct vop_print_args *ap) 1921 { 1922 struct denode *dep = VTODE(ap->a_vp); 1923 1924 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1925 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1926 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1927 return (0); 1928 } 1929 1930 static int 1931 msdosfs_pathconf(struct vop_pathconf_args *ap) 1932 { 1933 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1934 1935 switch (ap->a_name) { 1936 case _PC_FILESIZEBITS: 1937 *ap->a_retval = 32; 1938 return (0); 1939 case _PC_LINK_MAX: 1940 *ap->a_retval = 1; 1941 return (0); 1942 case _PC_NAME_MAX: 1943 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1944 return (0); 1945 case _PC_CHOWN_RESTRICTED: 1946 *ap->a_retval = 1; 1947 return (0); 1948 case _PC_NO_TRUNC: 1949 *ap->a_retval = 0; 1950 return (0); 1951 default: 1952 return (vop_stdpathconf(ap)); 1953 } 1954 /* NOTREACHED */ 1955 } 1956 1957 static int 1958 msdosfs_vptofh(struct vop_vptofh_args *ap) 1959 { 1960 struct denode *dep; 1961 struct defid *defhp; 1962 1963 dep = VTODE(ap->a_vp); 1964 defhp = (struct defid *)ap->a_fhp; 1965 defhp->defid_len = sizeof(struct defid); 1966 defhp->defid_dirclust = dep->de_dirclust; 1967 defhp->defid_dirofs = dep->de_diroffset; 1968 /* defhp->defid_gen = dep->de_gen; */ 1969 return (0); 1970 } 1971 1972 /* Global vfs data structures for msdosfs */ 1973 struct vop_vector msdosfs_vnodeops = { 1974 .vop_default = &default_vnodeops, 1975 1976 .vop_access = msdosfs_access, 1977 .vop_bmap = msdosfs_bmap, 1978 .vop_getpages = msdosfs_getpages, 1979 .vop_cachedlookup = msdosfs_lookup, 1980 .vop_open = msdosfs_open, 1981 .vop_close = msdosfs_close, 1982 .vop_create = msdosfs_create, 1983 .vop_fsync = msdosfs_fsync, 1984 .vop_fdatasync = vop_stdfdatasync_buf, 1985 .vop_getattr = msdosfs_getattr, 1986 .vop_inactive = msdosfs_inactive, 1987 .vop_link = msdosfs_link, 1988 .vop_lookup = vfs_cache_lookup, 1989 .vop_mkdir = msdosfs_mkdir, 1990 .vop_mknod = msdosfs_mknod, 1991 .vop_pathconf = msdosfs_pathconf, 1992 .vop_print = msdosfs_print, 1993 .vop_read = msdosfs_read, 1994 .vop_readdir = msdosfs_readdir, 1995 .vop_reclaim = msdosfs_reclaim, 1996 .vop_remove = msdosfs_remove, 1997 .vop_rename = msdosfs_rename, 1998 .vop_rmdir = msdosfs_rmdir, 1999 .vop_setattr = msdosfs_setattr, 2000 .vop_strategy = msdosfs_strategy, 2001 .vop_symlink = msdosfs_symlink, 2002 .vop_write = msdosfs_write, 2003 .vop_vptofh = msdosfs_vptofh, 2004 }; 2005 VFS_VOP_VECTOR_REGISTER(msdosfs_vnodeops);
Cache object: 58b8da48227fa7e4cb17711d330c2341
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