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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 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /*- 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/bio.h> 54 #include <sys/buf.h> 55 #include <sys/clock.h> 56 #include <sys/dirent.h> 57 #include <sys/lock.h> 58 #include <sys/lockf.h> 59 #include <sys/malloc.h> 60 #include <sys/mount.h> 61 #include <sys/mutex.h> 62 #include <sys/namei.h> 63 #include <sys/priv.h> 64 #include <sys/stat.h> 65 #include <sys/unistd.h> 66 #include <sys/vnode.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_extern.h> 70 71 #include <fs/msdosfs/bpb.h> 72 #include <fs/msdosfs/direntry.h> 73 #include <fs/msdosfs/denode.h> 74 #include <fs/msdosfs/fat.h> 75 #include <fs/msdosfs/msdosfsmount.h> 76 77 #define DOS_FILESIZE_MAX 0xffffffff 78 79 /* 80 * Prototypes for MSDOSFS vnode operations 81 */ 82 static vop_create_t msdosfs_create; 83 static vop_mknod_t msdosfs_mknod; 84 static vop_open_t msdosfs_open; 85 static vop_close_t msdosfs_close; 86 static vop_access_t msdosfs_access; 87 static vop_getattr_t msdosfs_getattr; 88 static vop_setattr_t msdosfs_setattr; 89 static vop_read_t msdosfs_read; 90 static vop_write_t msdosfs_write; 91 static vop_fsync_t msdosfs_fsync; 92 static vop_remove_t msdosfs_remove; 93 static vop_link_t msdosfs_link; 94 static vop_rename_t msdosfs_rename; 95 static vop_mkdir_t msdosfs_mkdir; 96 static vop_rmdir_t msdosfs_rmdir; 97 static vop_symlink_t msdosfs_symlink; 98 static vop_readdir_t msdosfs_readdir; 99 static vop_bmap_t msdosfs_bmap; 100 static vop_strategy_t msdosfs_strategy; 101 static vop_print_t msdosfs_print; 102 static vop_pathconf_t msdosfs_pathconf; 103 static vop_vptofh_t msdosfs_vptofh; 104 105 /* 106 * Some general notes: 107 * 108 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 109 * read/written using the vnode for the filesystem. Blocks that represent 110 * the contents of a file are read/written using the vnode for the file 111 * (including directories when they are read/written as files). This 112 * presents problems for the dos filesystem because data that should be in 113 * an inode (if dos had them) resides in the directory itself. Since we 114 * must update directory entries without the benefit of having the vnode 115 * for the directory we must use the vnode for the filesystem. This means 116 * that when a directory is actually read/written (via read, write, or 117 * readdir, or seek) we must use the vnode for the filesystem instead of 118 * the vnode for the directory as would happen in ufs. This is to insure we 119 * retreive the correct block from the buffer cache since the hash value is 120 * based upon the vnode address and the desired block number. 121 */ 122 123 /* 124 * Create a regular file. On entry the directory to contain the file being 125 * created is locked. We must release before we return. We must also free 126 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 127 * only if the SAVESTART bit in cn_flags is clear on success. 128 */ 129 static int 130 msdosfs_create(ap) 131 struct vop_create_args /* { 132 struct vnode *a_dvp; 133 struct vnode **a_vpp; 134 struct componentname *a_cnp; 135 struct vattr *a_vap; 136 } */ *ap; 137 { 138 struct componentname *cnp = ap->a_cnp; 139 struct denode ndirent; 140 struct denode *dep; 141 struct denode *pdep = VTODE(ap->a_dvp); 142 struct timespec ts; 143 int error; 144 145 #ifdef MSDOSFS_DEBUG 146 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 147 #endif 148 149 /* 150 * If this is the root directory and there is no space left we 151 * can't do anything. This is because the root directory can not 152 * change size. 153 */ 154 if (pdep->de_StartCluster == MSDOSFSROOT 155 && pdep->de_fndoffset >= pdep->de_FileSize) { 156 error = ENOSPC; 157 goto bad; 158 } 159 160 /* 161 * Create a directory entry for the file, then call createde() to 162 * have it installed. NOTE: DOS files are always executable. We 163 * use the absence of the owner write bit to make the file 164 * readonly. 165 */ 166 #ifdef DIAGNOSTIC 167 if ((cnp->cn_flags & HASBUF) == 0) 168 panic("msdosfs_create: no name"); 169 #endif 170 bzero(&ndirent, sizeof(ndirent)); 171 error = uniqdosname(pdep, cnp, ndirent.de_Name); 172 if (error) 173 goto bad; 174 175 ndirent.de_Attributes = ATTR_ARCHIVE; 176 ndirent.de_LowerCase = 0; 177 ndirent.de_StartCluster = 0; 178 ndirent.de_FileSize = 0; 179 ndirent.de_pmp = pdep->de_pmp; 180 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 181 getnanotime(&ts); 182 DETIMES(&ndirent, &ts, &ts, &ts); 183 error = createde(&ndirent, pdep, &dep, cnp); 184 if (error) 185 goto bad; 186 *ap->a_vpp = DETOV(dep); 187 if ((cnp->cn_flags & MAKEENTRY) != 0) 188 cache_enter(ap->a_dvp, *ap->a_vpp, cnp); 189 return (0); 190 191 bad: 192 return (error); 193 } 194 195 static int 196 msdosfs_mknod(ap) 197 struct vop_mknod_args /* { 198 struct vnode *a_dvp; 199 struct vnode **a_vpp; 200 struct componentname *a_cnp; 201 struct vattr *a_vap; 202 } */ *ap; 203 { 204 205 return (EINVAL); 206 } 207 208 static int 209 msdosfs_open(ap) 210 struct vop_open_args /* { 211 struct vnode *a_vp; 212 int a_mode; 213 struct ucred *a_cred; 214 struct thread *a_td; 215 struct file *a_fp; 216 } */ *ap; 217 { 218 struct denode *dep = VTODE(ap->a_vp); 219 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 220 return 0; 221 } 222 223 static int 224 msdosfs_close(ap) 225 struct vop_close_args /* { 226 struct vnode *a_vp; 227 int a_fflag; 228 struct ucred *a_cred; 229 struct thread *a_td; 230 } */ *ap; 231 { 232 struct vnode *vp = ap->a_vp; 233 struct denode *dep = VTODE(vp); 234 struct timespec ts; 235 236 VI_LOCK(vp); 237 if (vp->v_usecount > 1) { 238 getnanotime(&ts); 239 DETIMES(dep, &ts, &ts, &ts); 240 } 241 VI_UNLOCK(vp); 242 return 0; 243 } 244 245 static int 246 msdosfs_access(ap) 247 struct vop_access_args /* { 248 struct vnode *a_vp; 249 accmode_t a_accmode; 250 struct ucred *a_cred; 251 struct thread *a_td; 252 } */ *ap; 253 { 254 struct vnode *vp = ap->a_vp; 255 struct denode *dep = VTODE(ap->a_vp); 256 struct msdosfsmount *pmp = dep->de_pmp; 257 mode_t file_mode; 258 accmode_t accmode = ap->a_accmode; 259 260 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 261 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 262 263 /* 264 * Disallow writing to directories and regular files if the 265 * filesystem is read-only. 266 */ 267 if (accmode & VWRITE) { 268 switch (vp->v_type) { 269 case VREG: 270 case VDIR: 271 if (vp->v_mount->mnt_flag & MNT_RDONLY) 272 return (EROFS); 273 break; 274 default: 275 break; 276 } 277 } 278 279 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 280 ap->a_accmode, ap->a_cred, NULL)); 281 } 282 283 static int 284 msdosfs_getattr(ap) 285 struct vop_getattr_args /* { 286 struct vnode *a_vp; 287 struct vattr *a_vap; 288 struct ucred *a_cred; 289 } */ *ap; 290 { 291 struct denode *dep = VTODE(ap->a_vp); 292 struct msdosfsmount *pmp = dep->de_pmp; 293 struct vattr *vap = ap->a_vap; 294 mode_t mode; 295 struct timespec ts; 296 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 297 uint64_t fileid; 298 299 getnanotime(&ts); 300 DETIMES(dep, &ts, &ts, &ts); 301 vap->va_fsid = dev2udev(pmp->pm_dev); 302 /* 303 * The following computation of the fileid must be the same as that 304 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 305 * doesn't work. 306 */ 307 if (dep->de_Attributes & ATTR_DIRECTORY) { 308 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 309 dirsperblk; 310 if (dep->de_StartCluster == MSDOSFSROOT) 311 fileid = 1; 312 } else { 313 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 314 dirsperblk; 315 if (dep->de_dirclust == MSDOSFSROOT) 316 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 317 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 318 } 319 320 if (pmp->pm_flags & MSDOSFS_LARGEFS) 321 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 322 else 323 vap->va_fileid = (long)fileid; 324 325 mode = S_IRWXU|S_IRWXG|S_IRWXO; 326 vap->va_mode = mode & 327 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 328 vap->va_uid = pmp->pm_uid; 329 vap->va_gid = pmp->pm_gid; 330 vap->va_nlink = 1; 331 vap->va_rdev = NODEV; 332 vap->va_size = dep->de_FileSize; 333 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 334 vap->va_ctime = vap->va_mtime; 335 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 336 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 337 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 338 0, &vap->va_birthtime); 339 } else { 340 vap->va_atime = vap->va_mtime; 341 vap->va_birthtime.tv_sec = -1; 342 vap->va_birthtime.tv_nsec = 0; 343 } 344 vap->va_flags = 0; 345 if (dep->de_Attributes & ATTR_ARCHIVE) 346 vap->va_flags |= UF_ARCHIVE; 347 if (dep->de_Attributes & ATTR_HIDDEN) 348 vap->va_flags |= UF_HIDDEN; 349 if (dep->de_Attributes & ATTR_READONLY) 350 vap->va_flags |= UF_READONLY; 351 if (dep->de_Attributes & ATTR_SYSTEM) 352 vap->va_flags |= UF_SYSTEM; 353 vap->va_gen = 0; 354 vap->va_blocksize = pmp->pm_bpcluster; 355 vap->va_bytes = 356 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 357 vap->va_type = ap->a_vp->v_type; 358 vap->va_filerev = dep->de_modrev; 359 return (0); 360 } 361 362 static int 363 msdosfs_setattr(ap) 364 struct vop_setattr_args /* { 365 struct vnode *a_vp; 366 struct vattr *a_vap; 367 struct ucred *a_cred; 368 } */ *ap; 369 { 370 struct vnode *vp = ap->a_vp; 371 struct denode *dep = VTODE(ap->a_vp); 372 struct msdosfsmount *pmp = dep->de_pmp; 373 struct vattr *vap = ap->a_vap; 374 struct ucred *cred = ap->a_cred; 375 struct thread *td = curthread; 376 int error = 0; 377 378 #ifdef MSDOSFS_DEBUG 379 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 380 ap->a_vp, vap, cred); 381 #endif 382 383 /* 384 * Check for unsettable attributes. 385 */ 386 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 387 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 388 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 389 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 390 #ifdef MSDOSFS_DEBUG 391 printf("msdosfs_setattr(): returning EINVAL\n"); 392 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 393 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 394 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 395 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 396 printf(" va_uid %x, va_gid %x\n", 397 vap->va_uid, vap->va_gid); 398 #endif 399 return (EINVAL); 400 } 401 402 /* 403 * We don't allow setting attributes on the root directory. 404 * The special case for the root directory is because before 405 * FAT32, the root directory didn't have an entry for itself 406 * (and was otherwise special). With FAT32, the root 407 * directory is not so special, but still doesn't have an 408 * entry for itself. 409 */ 410 if (vp->v_vflag & VV_ROOT) 411 return (EINVAL); 412 413 if (vap->va_flags != VNOVAL) { 414 if (vp->v_mount->mnt_flag & MNT_RDONLY) 415 return (EROFS); 416 if (cred->cr_uid != pmp->pm_uid) { 417 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 418 if (error) 419 return (error); 420 } 421 /* 422 * We are very inconsistent about handling unsupported 423 * attributes. We ignored the access time and the 424 * read and execute bits. We were strict for the other 425 * attributes. 426 */ 427 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY | 428 UF_SYSTEM)) 429 return EOPNOTSUPP; 430 if (vap->va_flags & UF_ARCHIVE) 431 dep->de_Attributes |= ATTR_ARCHIVE; 432 else 433 dep->de_Attributes &= ~ATTR_ARCHIVE; 434 if (vap->va_flags & UF_HIDDEN) 435 dep->de_Attributes |= ATTR_HIDDEN; 436 else 437 dep->de_Attributes &= ~ATTR_HIDDEN; 438 /* We don't allow changing the readonly bit on directories. */ 439 if (vp->v_type != VDIR) { 440 if (vap->va_flags & UF_READONLY) 441 dep->de_Attributes |= ATTR_READONLY; 442 else 443 dep->de_Attributes &= ~ATTR_READONLY; 444 } 445 if (vap->va_flags & UF_SYSTEM) 446 dep->de_Attributes |= ATTR_SYSTEM; 447 else 448 dep->de_Attributes &= ~ATTR_SYSTEM; 449 dep->de_flag |= DE_MODIFIED; 450 } 451 452 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 453 uid_t uid; 454 gid_t gid; 455 456 if (vp->v_mount->mnt_flag & MNT_RDONLY) 457 return (EROFS); 458 uid = vap->va_uid; 459 if (uid == (uid_t)VNOVAL) 460 uid = pmp->pm_uid; 461 gid = vap->va_gid; 462 if (gid == (gid_t)VNOVAL) 463 gid = pmp->pm_gid; 464 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 465 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 466 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 467 if (error) 468 return (error); 469 } 470 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 471 return EINVAL; 472 } 473 474 if (vap->va_size != VNOVAL) { 475 switch (vp->v_type) { 476 case VDIR: 477 return (EISDIR); 478 case VREG: 479 /* 480 * Truncation is only supported for regular files, 481 * Disallow it if the filesystem is read-only. 482 */ 483 if (vp->v_mount->mnt_flag & MNT_RDONLY) 484 return (EROFS); 485 break; 486 default: 487 /* 488 * According to POSIX, the result is unspecified 489 * for file types other than regular files, 490 * directories and shared memory objects. We 491 * don't support any file types except regular 492 * files and directories in this file system, so 493 * this (default) case is unreachable and can do 494 * anything. Keep falling through to detrunc() 495 * for now. 496 */ 497 break; 498 } 499 error = detrunc(dep, vap->va_size, 0, cred); 500 if (error) 501 return error; 502 } 503 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 504 if (vp->v_mount->mnt_flag & MNT_RDONLY) 505 return (EROFS); 506 error = vn_utimes_perm(vp, vap, cred, td); 507 if (error != 0) 508 return (error); 509 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 510 vap->va_atime.tv_sec != VNOVAL) { 511 dep->de_flag &= ~DE_ACCESS; 512 timespec2fattime(&vap->va_atime, 0, 513 &dep->de_ADate, NULL, NULL); 514 } 515 if (vap->va_mtime.tv_sec != VNOVAL) { 516 dep->de_flag &= ~DE_UPDATE; 517 timespec2fattime(&vap->va_mtime, 0, 518 &dep->de_MDate, &dep->de_MTime, NULL); 519 } 520 /* 521 * We don't set the archive bit when modifying the time of 522 * a directory to emulate the Windows/DOS behavior. 523 */ 524 if (vp->v_type != VDIR) 525 dep->de_Attributes |= ATTR_ARCHIVE; 526 dep->de_flag |= DE_MODIFIED; 527 } 528 /* 529 * DOS files only have the ability to have their writability 530 * attribute set, so we use the owner write bit to set the readonly 531 * attribute. 532 */ 533 if (vap->va_mode != (mode_t)VNOVAL) { 534 if (vp->v_mount->mnt_flag & MNT_RDONLY) 535 return (EROFS); 536 if (cred->cr_uid != pmp->pm_uid) { 537 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 538 if (error) 539 return (error); 540 } 541 if (vp->v_type != VDIR) { 542 /* We ignore the read and execute bits. */ 543 if (vap->va_mode & VWRITE) 544 dep->de_Attributes &= ~ATTR_READONLY; 545 else 546 dep->de_Attributes |= ATTR_READONLY; 547 dep->de_Attributes |= ATTR_ARCHIVE; 548 dep->de_flag |= DE_MODIFIED; 549 } 550 } 551 return (deupdat(dep, 0)); 552 } 553 554 static int 555 msdosfs_read(ap) 556 struct vop_read_args /* { 557 struct vnode *a_vp; 558 struct uio *a_uio; 559 int a_ioflag; 560 struct ucred *a_cred; 561 } */ *ap; 562 { 563 int error = 0; 564 int blsize; 565 int isadir; 566 ssize_t orig_resid; 567 u_int n; 568 u_long diff; 569 u_long on; 570 daddr_t lbn; 571 daddr_t rablock; 572 int rasize; 573 int seqcount; 574 struct buf *bp; 575 struct vnode *vp = ap->a_vp; 576 struct denode *dep = VTODE(vp); 577 struct msdosfsmount *pmp = dep->de_pmp; 578 struct uio *uio = ap->a_uio; 579 580 /* 581 * If they didn't ask for any data, then we are done. 582 */ 583 orig_resid = uio->uio_resid; 584 if (orig_resid == 0) 585 return (0); 586 587 /* 588 * The caller is supposed to ensure that 589 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 590 * We don't need to check for large offsets as in ffs because 591 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large 592 * offsets cannot cause overflow even in theory. 593 */ 594 595 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 596 597 isadir = dep->de_Attributes & ATTR_DIRECTORY; 598 do { 599 if (uio->uio_offset >= dep->de_FileSize) 600 break; 601 lbn = de_cluster(pmp, uio->uio_offset); 602 rablock = lbn + 1; 603 blsize = pmp->pm_bpcluster; 604 on = uio->uio_offset & pmp->pm_crbomask; 605 /* 606 * If we are operating on a directory file then be sure to 607 * do i/o with the vnode for the filesystem instead of the 608 * vnode for the directory. 609 */ 610 if (isadir) { 611 /* convert cluster # to block # */ 612 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 613 if (error == E2BIG) { 614 error = EINVAL; 615 break; 616 } else if (error) 617 break; 618 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 619 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 620 error = bread(vp, lbn, blsize, NOCRED, &bp); 621 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 622 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 623 NOCRED, on + uio->uio_resid, seqcount, 0, &bp); 624 } else if (seqcount > 1) { 625 rasize = blsize; 626 error = breadn(vp, lbn, 627 blsize, &rablock, &rasize, 1, NOCRED, &bp); 628 } else { 629 error = bread(vp, lbn, blsize, NOCRED, &bp); 630 } 631 if (error) { 632 brelse(bp); 633 break; 634 } 635 diff = pmp->pm_bpcluster - on; 636 n = diff > uio->uio_resid ? uio->uio_resid : diff; 637 diff = dep->de_FileSize - uio->uio_offset; 638 if (diff < n) 639 n = diff; 640 diff = blsize - bp->b_resid; 641 if (diff < n) 642 n = diff; 643 error = vn_io_fault_uiomove(bp->b_data + on, (int) n, uio); 644 brelse(bp); 645 } while (error == 0 && uio->uio_resid > 0 && n != 0); 646 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 647 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 648 dep->de_flag |= DE_ACCESS; 649 return (error); 650 } 651 652 /* 653 * Write data to a file or directory. 654 */ 655 static int 656 msdosfs_write(ap) 657 struct vop_write_args /* { 658 struct vnode *a_vp; 659 struct uio *a_uio; 660 int a_ioflag; 661 struct ucred *a_cred; 662 } */ *ap; 663 { 664 int n; 665 int croffset; 666 ssize_t resid; 667 u_long osize; 668 int error = 0; 669 u_long count; 670 int seqcount; 671 daddr_t bn, lastcn; 672 struct buf *bp; 673 int ioflag = ap->a_ioflag; 674 struct uio *uio = ap->a_uio; 675 struct vnode *vp = ap->a_vp; 676 struct vnode *thisvp; 677 struct denode *dep = VTODE(vp); 678 struct msdosfsmount *pmp = dep->de_pmp; 679 struct ucred *cred = ap->a_cred; 680 681 #ifdef MSDOSFS_DEBUG 682 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 683 vp, uio, ioflag, cred); 684 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 685 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 686 #endif 687 688 switch (vp->v_type) { 689 case VREG: 690 if (ioflag & IO_APPEND) 691 uio->uio_offset = dep->de_FileSize; 692 thisvp = vp; 693 break; 694 case VDIR: 695 return EISDIR; 696 default: 697 panic("msdosfs_write(): bad file type"); 698 } 699 700 /* 701 * This is needed (unlike in ffs_write()) because we extend the 702 * file outside of the loop but we don't want to extend the file 703 * for writes of 0 bytes. 704 */ 705 if (uio->uio_resid == 0) 706 return (0); 707 708 /* 709 * The caller is supposed to ensure that 710 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 711 */ 712 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 713 return (EFBIG); 714 715 /* 716 * If they've exceeded their filesize limit, tell them about it. 717 */ 718 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 719 return (EFBIG); 720 721 /* 722 * If the offset we are starting the write at is beyond the end of 723 * the file, then they've done a seek. Unix filesystems allow 724 * files with holes in them, DOS doesn't so we must fill the hole 725 * with zeroed blocks. 726 */ 727 if (uio->uio_offset > dep->de_FileSize) { 728 error = deextend(dep, uio->uio_offset, cred); 729 if (error) 730 return (error); 731 } 732 733 /* 734 * Remember some values in case the write fails. 735 */ 736 resid = uio->uio_resid; 737 osize = dep->de_FileSize; 738 739 /* 740 * If we write beyond the end of the file, extend it to its ultimate 741 * size ahead of the time to hopefully get a contiguous area. 742 */ 743 if (uio->uio_offset + resid > osize) { 744 count = de_clcount(pmp, uio->uio_offset + resid) - 745 de_clcount(pmp, osize); 746 error = extendfile(dep, count, NULL, NULL, 0); 747 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 748 goto errexit; 749 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 750 } else 751 lastcn = de_clcount(pmp, osize) - 1; 752 753 seqcount = ioflag >> IO_SEQSHIFT; 754 do { 755 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 756 error = ENOSPC; 757 break; 758 } 759 760 croffset = uio->uio_offset & pmp->pm_crbomask; 761 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 762 if (uio->uio_offset + n > dep->de_FileSize) { 763 dep->de_FileSize = uio->uio_offset + n; 764 /* The object size needs to be set before buffer is allocated */ 765 vnode_pager_setsize(vp, dep->de_FileSize); 766 } 767 768 bn = de_cluster(pmp, uio->uio_offset); 769 if ((uio->uio_offset & pmp->pm_crbomask) == 0 770 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 771 > de_cluster(pmp, uio->uio_offset) 772 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 773 /* 774 * If either the whole cluster gets written, 775 * or we write the cluster from its start beyond EOF, 776 * then no need to read data from disk. 777 */ 778 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 779 /* 780 * This call to vfs_bio_clrbuf() ensures that 781 * even if vn_io_fault_uiomove() below faults, 782 * garbage from the newly instantiated buffer 783 * is not exposed to the userspace via mmap(). 784 */ 785 vfs_bio_clrbuf(bp); 786 /* 787 * Do the bmap now, since pcbmap needs buffers 788 * for the fat table. (see msdosfs_strategy) 789 */ 790 if (bp->b_blkno == bp->b_lblkno) { 791 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 792 if (error) 793 bp->b_blkno = -1; 794 else 795 bp->b_blkno = bn; 796 } 797 if (bp->b_blkno == -1) { 798 brelse(bp); 799 if (!error) 800 error = EIO; /* XXX */ 801 break; 802 } 803 } else { 804 /* 805 * The block we need to write into exists, so read it in. 806 */ 807 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 808 if (error) { 809 brelse(bp); 810 break; 811 } 812 } 813 814 /* 815 * Should these vnode_pager_* functions be done on dir 816 * files? 817 */ 818 819 /* 820 * Copy the data from user space into the buf header. 821 */ 822 error = vn_io_fault_uiomove(bp->b_data + croffset, n, uio); 823 if (error) { 824 brelse(bp); 825 break; 826 } 827 828 /* Prepare for clustered writes in some else clauses. */ 829 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 830 bp->b_flags |= B_CLUSTEROK; 831 832 /* 833 * If IO_SYNC, then each buffer is written synchronously. 834 * Otherwise, if we have a severe page deficiency then 835 * write the buffer asynchronously. Otherwise, if on a 836 * cluster boundary then write the buffer asynchronously, 837 * combining it with contiguous clusters if permitted and 838 * possible, since we don't expect more writes into this 839 * buffer soon. Otherwise, do a delayed write because we 840 * expect more writes into this buffer soon. 841 */ 842 if (ioflag & IO_SYNC) 843 (void)bwrite(bp); 844 else if (vm_page_count_severe() || buf_dirty_count_severe()) 845 bawrite(bp); 846 else if (n + croffset == pmp->pm_bpcluster) { 847 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 848 cluster_write(vp, bp, dep->de_FileSize, 849 seqcount, 0); 850 else 851 bawrite(bp); 852 } else 853 bdwrite(bp); 854 dep->de_flag |= DE_UPDATE; 855 } while (error == 0 && uio->uio_resid > 0); 856 857 /* 858 * If the write failed and they want us to, truncate the file back 859 * to the size it was before the write was attempted. 860 */ 861 errexit: 862 if (error) { 863 if (ioflag & IO_UNIT) { 864 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 865 uio->uio_offset -= resid - uio->uio_resid; 866 uio->uio_resid = resid; 867 } else { 868 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 869 if (uio->uio_resid != resid) 870 error = 0; 871 } 872 } else if (ioflag & IO_SYNC) 873 error = deupdat(dep, 1); 874 return (error); 875 } 876 877 /* 878 * Flush the blocks of a file to disk. 879 */ 880 static int 881 msdosfs_fsync(ap) 882 struct vop_fsync_args /* { 883 struct vnode *a_vp; 884 struct ucred *a_cred; 885 int a_waitfor; 886 struct thread *a_td; 887 } */ *ap; 888 { 889 struct vnode *devvp; 890 int allerror, error; 891 892 vop_stdfsync(ap); 893 894 /* 895 * If the syncing request comes from fsync(2), sync the entire 896 * FAT and any other metadata that happens to be on devvp. We 897 * need this mainly for the FAT. We write the FAT sloppily, and 898 * syncing it all now is the best we can easily do to get all 899 * directory entries associated with the file (not just the file) 900 * fully synced. The other metadata includes critical metadata 901 * for all directory entries, but only in the MNT_ASYNC case. We 902 * will soon sync all metadata in the file's directory entry. 903 * Non-critical metadata for associated directory entries only 904 * gets synced accidentally, as in most file systems. 905 */ 906 if (ap->a_waitfor == MNT_WAIT) { 907 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 908 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 909 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 910 VOP_UNLOCK(devvp, 0); 911 } else 912 allerror = 0; 913 914 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT); 915 if (allerror == 0) 916 allerror = error; 917 return (allerror); 918 } 919 920 static int 921 msdosfs_remove(ap) 922 struct vop_remove_args /* { 923 struct vnode *a_dvp; 924 struct vnode *a_vp; 925 struct componentname *a_cnp; 926 } */ *ap; 927 { 928 struct denode *dep = VTODE(ap->a_vp); 929 struct denode *ddep = VTODE(ap->a_dvp); 930 int error; 931 932 if (ap->a_vp->v_type == VDIR) 933 error = EPERM; 934 else 935 error = removede(ddep, dep); 936 #ifdef MSDOSFS_DEBUG 937 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 938 #endif 939 return (error); 940 } 941 942 /* 943 * DOS filesystems don't know what links are. 944 */ 945 static int 946 msdosfs_link(ap) 947 struct vop_link_args /* { 948 struct vnode *a_tdvp; 949 struct vnode *a_vp; 950 struct componentname *a_cnp; 951 } */ *ap; 952 { 953 return (EOPNOTSUPP); 954 } 955 956 /* 957 * Renames on files require moving the denode to a new hash queue since the 958 * denode's location is used to compute which hash queue to put the file 959 * in. Unless it is a rename in place. For example "mv a b". 960 * 961 * What follows is the basic algorithm: 962 * 963 * if (file move) { 964 * if (dest file exists) { 965 * remove dest file 966 * } 967 * if (dest and src in same directory) { 968 * rewrite name in existing directory slot 969 * } else { 970 * write new entry in dest directory 971 * update offset and dirclust in denode 972 * move denode to new hash chain 973 * clear old directory entry 974 * } 975 * } else { 976 * directory move 977 * if (dest directory exists) { 978 * if (dest is not empty) { 979 * return ENOTEMPTY 980 * } 981 * remove dest directory 982 * } 983 * if (dest and src in same directory) { 984 * rewrite name in existing entry 985 * } else { 986 * be sure dest is not a child of src directory 987 * write entry in dest directory 988 * update "." and ".." in moved directory 989 * clear old directory entry for moved directory 990 * } 991 * } 992 * 993 * On entry: 994 * source's parent directory is unlocked 995 * source file or directory is unlocked 996 * destination's parent directory is locked 997 * destination file or directory is locked if it exists 998 * 999 * On exit: 1000 * all denodes should be released 1001 */ 1002 static int 1003 msdosfs_rename(ap) 1004 struct vop_rename_args /* { 1005 struct vnode *a_fdvp; 1006 struct vnode *a_fvp; 1007 struct componentname *a_fcnp; 1008 struct vnode *a_tdvp; 1009 struct vnode *a_tvp; 1010 struct componentname *a_tcnp; 1011 } */ *ap; 1012 { 1013 struct vnode *tdvp = ap->a_tdvp; 1014 struct vnode *fvp = ap->a_fvp; 1015 struct vnode *fdvp = ap->a_fdvp; 1016 struct vnode *tvp = ap->a_tvp; 1017 struct componentname *tcnp = ap->a_tcnp; 1018 struct componentname *fcnp = ap->a_fcnp; 1019 struct denode *ip, *xp, *dp, *zp; 1020 u_char toname[12], oldname[11]; 1021 u_long from_diroffset, to_diroffset; 1022 u_char to_count; 1023 int doingdirectory = 0, newparent = 0; 1024 int error; 1025 u_long cn, pcl; 1026 daddr_t bn; 1027 struct denode *fddep; /* from file's parent directory */ 1028 struct msdosfsmount *pmp; 1029 struct direntry *dotdotp; 1030 struct buf *bp; 1031 1032 fddep = VTODE(ap->a_fdvp); 1033 pmp = fddep->de_pmp; 1034 1035 pmp = VFSTOMSDOSFS(fdvp->v_mount); 1036 1037 #ifdef DIAGNOSTIC 1038 if ((tcnp->cn_flags & HASBUF) == 0 || 1039 (fcnp->cn_flags & HASBUF) == 0) 1040 panic("msdosfs_rename: no name"); 1041 #endif 1042 /* 1043 * Check for cross-device rename. 1044 */ 1045 if (fvp->v_mount != tdvp->v_mount || 1046 (tvp && fvp->v_mount != tvp->v_mount)) { 1047 error = EXDEV; 1048 abortit: 1049 if (tdvp == tvp) 1050 vrele(tdvp); 1051 else 1052 vput(tdvp); 1053 if (tvp) 1054 vput(tvp); 1055 vrele(fdvp); 1056 vrele(fvp); 1057 return (error); 1058 } 1059 1060 /* 1061 * If source and dest are the same, do nothing. 1062 */ 1063 if (tvp == fvp) { 1064 error = 0; 1065 goto abortit; 1066 } 1067 1068 error = vn_lock(fvp, LK_EXCLUSIVE); 1069 if (error) 1070 goto abortit; 1071 dp = VTODE(fdvp); 1072 ip = VTODE(fvp); 1073 1074 /* 1075 * Be sure we are not renaming ".", "..", or an alias of ".". This 1076 * leads to a crippled directory tree. It's pretty tough to do a 1077 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1078 * doesn't work if the ".." entry is missing. 1079 */ 1080 if (ip->de_Attributes & ATTR_DIRECTORY) { 1081 /* 1082 * Avoid ".", "..", and aliases of "." for obvious reasons. 1083 */ 1084 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1085 dp == ip || 1086 (fcnp->cn_flags & ISDOTDOT) || 1087 (tcnp->cn_flags & ISDOTDOT) || 1088 (ip->de_flag & DE_RENAME)) { 1089 VOP_UNLOCK(fvp, 0); 1090 error = EINVAL; 1091 goto abortit; 1092 } 1093 ip->de_flag |= DE_RENAME; 1094 doingdirectory++; 1095 } 1096 1097 /* 1098 * When the target exists, both the directory 1099 * and target vnodes are returned locked. 1100 */ 1101 dp = VTODE(tdvp); 1102 xp = tvp ? VTODE(tvp) : NULL; 1103 /* 1104 * Remember direntry place to use for destination 1105 */ 1106 to_diroffset = dp->de_fndoffset; 1107 to_count = dp->de_fndcnt; 1108 1109 /* 1110 * If ".." must be changed (ie the directory gets a new 1111 * parent) then the source directory must not be in the 1112 * directory hierarchy above the target, as this would 1113 * orphan everything below the source directory. Also 1114 * the user must have write permission in the source so 1115 * as to be able to change "..". We must repeat the call 1116 * to namei, as the parent directory is unlocked by the 1117 * call to doscheckpath(). 1118 */ 1119 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1120 VOP_UNLOCK(fvp, 0); 1121 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1122 newparent = 1; 1123 if (doingdirectory && newparent) { 1124 if (error) /* write access check above */ 1125 goto bad; 1126 if (xp != NULL) 1127 vput(tvp); 1128 /* 1129 * doscheckpath() vput()'s dp, 1130 * so we have to do a relookup afterwards 1131 */ 1132 error = doscheckpath(ip, dp); 1133 if (error) 1134 goto out; 1135 if ((tcnp->cn_flags & SAVESTART) == 0) 1136 panic("msdosfs_rename: lost to startdir"); 1137 error = relookup(tdvp, &tvp, tcnp); 1138 if (error) 1139 goto out; 1140 dp = VTODE(tdvp); 1141 xp = tvp ? VTODE(tvp) : NULL; 1142 } 1143 1144 if (xp != NULL) { 1145 /* 1146 * Target must be empty if a directory and have no links 1147 * to it. Also, ensure source and target are compatible 1148 * (both directories, or both not directories). 1149 */ 1150 if (xp->de_Attributes & ATTR_DIRECTORY) { 1151 if (!dosdirempty(xp)) { 1152 error = ENOTEMPTY; 1153 goto bad; 1154 } 1155 if (!doingdirectory) { 1156 error = ENOTDIR; 1157 goto bad; 1158 } 1159 cache_purge(tdvp); 1160 } else if (doingdirectory) { 1161 error = EISDIR; 1162 goto bad; 1163 } 1164 error = removede(dp, xp); 1165 if (error) 1166 goto bad; 1167 vput(tvp); 1168 xp = NULL; 1169 } 1170 1171 /* 1172 * Convert the filename in tcnp into a dos filename. We copy this 1173 * into the denode and directory entry for the destination 1174 * file/directory. 1175 */ 1176 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1177 if (error) 1178 goto abortit; 1179 1180 /* 1181 * Since from wasn't locked at various places above, 1182 * have to do a relookup here. 1183 */ 1184 fcnp->cn_flags &= ~MODMASK; 1185 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1186 if ((fcnp->cn_flags & SAVESTART) == 0) 1187 panic("msdosfs_rename: lost from startdir"); 1188 if (!newparent) 1189 VOP_UNLOCK(tdvp, 0); 1190 if (relookup(fdvp, &fvp, fcnp) == 0) 1191 vrele(fdvp); 1192 if (fvp == NULL) { 1193 /* 1194 * From name has disappeared. 1195 */ 1196 if (doingdirectory) 1197 panic("rename: lost dir entry"); 1198 if (newparent) 1199 VOP_UNLOCK(tdvp, 0); 1200 vrele(tdvp); 1201 vrele(ap->a_fvp); 1202 return 0; 1203 } 1204 xp = VTODE(fvp); 1205 zp = VTODE(fdvp); 1206 from_diroffset = zp->de_fndoffset; 1207 1208 /* 1209 * Ensure that the directory entry still exists and has not 1210 * changed till now. If the source is a file the entry may 1211 * have been unlinked or renamed. In either case there is 1212 * no further work to be done. If the source is a directory 1213 * then it cannot have been rmdir'ed or renamed; this is 1214 * prohibited by the DE_RENAME flag. 1215 */ 1216 if (xp != ip) { 1217 if (doingdirectory) 1218 panic("rename: lost dir entry"); 1219 VOP_UNLOCK(fvp, 0); 1220 if (newparent) 1221 VOP_UNLOCK(fdvp, 0); 1222 vrele(ap->a_fvp); 1223 xp = NULL; 1224 } else { 1225 vrele(fvp); 1226 xp = NULL; 1227 1228 /* 1229 * First write a new entry in the destination 1230 * directory and mark the entry in the source directory 1231 * as deleted. Then move the denode to the correct hash 1232 * chain for its new location in the filesystem. And, if 1233 * we moved a directory, then update its .. entry to point 1234 * to the new parent directory. 1235 */ 1236 bcopy(ip->de_Name, oldname, 11); 1237 bcopy(toname, ip->de_Name, 11); /* update denode */ 1238 dp->de_fndoffset = to_diroffset; 1239 dp->de_fndcnt = to_count; 1240 error = createde(ip, dp, (struct denode **)0, tcnp); 1241 if (error) { 1242 bcopy(oldname, ip->de_Name, 11); 1243 if (newparent) 1244 VOP_UNLOCK(fdvp, 0); 1245 VOP_UNLOCK(fvp, 0); 1246 goto bad; 1247 } 1248 /* 1249 * If ip is for a directory, then its name should always 1250 * be "." since it is for the directory entry in the 1251 * directory itself (msdosfs_lookup() always translates 1252 * to the "." entry so as to get a unique denode, except 1253 * for the root directory there are different 1254 * complications). However, we just corrupted its name 1255 * to pass the correct name to createde(). Undo this. 1256 */ 1257 if ((ip->de_Attributes & ATTR_DIRECTORY) != 0) 1258 bcopy(oldname, ip->de_Name, 11); 1259 ip->de_refcnt++; 1260 zp->de_fndoffset = from_diroffset; 1261 error = removede(zp, ip); 1262 if (error) { 1263 /* XXX should downgrade to ro here, fs is corrupt */ 1264 if (newparent) 1265 VOP_UNLOCK(fdvp, 0); 1266 VOP_UNLOCK(fvp, 0); 1267 goto bad; 1268 } 1269 if (!doingdirectory) { 1270 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1271 &ip->de_dirclust, 0); 1272 if (error) { 1273 /* XXX should downgrade to ro here, fs is corrupt */ 1274 if (newparent) 1275 VOP_UNLOCK(fdvp, 0); 1276 VOP_UNLOCK(fvp, 0); 1277 goto bad; 1278 } 1279 if (ip->de_dirclust == MSDOSFSROOT) 1280 ip->de_diroffset = to_diroffset; 1281 else 1282 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1283 } 1284 reinsert(ip); 1285 if (newparent) 1286 VOP_UNLOCK(fdvp, 0); 1287 } 1288 1289 /* 1290 * If we moved a directory to a new parent directory, then we must 1291 * fixup the ".." entry in the moved directory. 1292 */ 1293 if (doingdirectory && newparent) { 1294 cn = ip->de_StartCluster; 1295 if (cn == MSDOSFSROOT) { 1296 /* this should never happen */ 1297 panic("msdosfs_rename(): updating .. in root directory?"); 1298 } else 1299 bn = cntobn(pmp, cn); 1300 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1301 NOCRED, &bp); 1302 if (error) { 1303 /* XXX should downgrade to ro here, fs is corrupt */ 1304 brelse(bp); 1305 VOP_UNLOCK(fvp, 0); 1306 goto bad; 1307 } 1308 dotdotp = (struct direntry *)bp->b_data + 1; 1309 pcl = dp->de_StartCluster; 1310 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1311 pcl = MSDOSFSROOT; 1312 putushort(dotdotp->deStartCluster, pcl); 1313 if (FAT32(pmp)) 1314 putushort(dotdotp->deHighClust, pcl >> 16); 1315 if (DOINGASYNC(fvp)) 1316 bdwrite(bp); 1317 else if ((error = bwrite(bp)) != 0) { 1318 /* XXX should downgrade to ro here, fs is corrupt */ 1319 VOP_UNLOCK(fvp, 0); 1320 goto bad; 1321 } 1322 } 1323 1324 /* 1325 * The msdosfs lookup is case insensitive. Several aliases may 1326 * be inserted for a single directory entry. As a consequnce, 1327 * name cache purge done by lookup for fvp when DELETE op for 1328 * namei is specified, might be not enough to expunge all 1329 * namecache entries that were installed for this direntry. 1330 */ 1331 cache_purge(fvp); 1332 VOP_UNLOCK(fvp, 0); 1333 bad: 1334 if (xp) 1335 vput(tvp); 1336 vput(tdvp); 1337 out: 1338 ip->de_flag &= ~DE_RENAME; 1339 vrele(fdvp); 1340 vrele(fvp); 1341 return (error); 1342 1343 } 1344 1345 static struct { 1346 struct direntry dot; 1347 struct direntry dotdot; 1348 } dosdirtemplate = { 1349 { ". ", /* the . entry */ 1350 ATTR_DIRECTORY, /* file attribute */ 1351 0, /* reserved */ 1352 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1353 { 0, 0 }, /* access date */ 1354 { 0, 0 }, /* high bits of start cluster */ 1355 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1356 { 0, 0 }, /* startcluster */ 1357 { 0, 0, 0, 0 } /* filesize */ 1358 }, 1359 { ".. ", /* the .. entry */ 1360 ATTR_DIRECTORY, /* file attribute */ 1361 0, /* reserved */ 1362 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1363 { 0, 0 }, /* access date */ 1364 { 0, 0 }, /* high bits of start cluster */ 1365 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1366 { 0, 0 }, /* startcluster */ 1367 { 0, 0, 0, 0 } /* filesize */ 1368 } 1369 }; 1370 1371 static int 1372 msdosfs_mkdir(ap) 1373 struct vop_mkdir_args /* { 1374 struct vnode *a_dvp; 1375 struct vnode **a_vpp; 1376 struvt componentname *a_cnp; 1377 struct vattr *a_vap; 1378 } */ *ap; 1379 { 1380 struct componentname *cnp = ap->a_cnp; 1381 struct denode *dep; 1382 struct denode *pdep = VTODE(ap->a_dvp); 1383 struct direntry *denp; 1384 struct msdosfsmount *pmp = pdep->de_pmp; 1385 struct buf *bp; 1386 u_long newcluster, pcl; 1387 int bn; 1388 int error; 1389 struct denode ndirent; 1390 struct timespec ts; 1391 1392 /* 1393 * If this is the root directory and there is no space left we 1394 * can't do anything. This is because the root directory can not 1395 * change size. 1396 */ 1397 if (pdep->de_StartCluster == MSDOSFSROOT 1398 && pdep->de_fndoffset >= pdep->de_FileSize) { 1399 error = ENOSPC; 1400 goto bad2; 1401 } 1402 1403 /* 1404 * Allocate a cluster to hold the about to be created directory. 1405 */ 1406 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1407 if (error) 1408 goto bad2; 1409 1410 bzero(&ndirent, sizeof(ndirent)); 1411 ndirent.de_pmp = pmp; 1412 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1413 getnanotime(&ts); 1414 DETIMES(&ndirent, &ts, &ts, &ts); 1415 1416 /* 1417 * Now fill the cluster with the "." and ".." entries. And write 1418 * the cluster to disk. This way it is there for the parent 1419 * directory to be pointing at if there were a crash. 1420 */ 1421 bn = cntobn(pmp, newcluster); 1422 /* always succeeds */ 1423 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1424 bzero(bp->b_data, pmp->pm_bpcluster); 1425 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1426 denp = (struct direntry *)bp->b_data; 1427 putushort(denp[0].deStartCluster, newcluster); 1428 putushort(denp[0].deCDate, ndirent.de_CDate); 1429 putushort(denp[0].deCTime, ndirent.de_CTime); 1430 denp[0].deCHundredth = ndirent.de_CHun; 1431 putushort(denp[0].deADate, ndirent.de_ADate); 1432 putushort(denp[0].deMDate, ndirent.de_MDate); 1433 putushort(denp[0].deMTime, ndirent.de_MTime); 1434 pcl = pdep->de_StartCluster; 1435 /* 1436 * Although the root directory has a non-magic starting cluster 1437 * number for FAT32, chkdsk and fsck_msdosfs still require 1438 * references to it in dotdot entries to be magic. 1439 */ 1440 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1441 pcl = MSDOSFSROOT; 1442 putushort(denp[1].deStartCluster, pcl); 1443 putushort(denp[1].deCDate, ndirent.de_CDate); 1444 putushort(denp[1].deCTime, ndirent.de_CTime); 1445 denp[1].deCHundredth = ndirent.de_CHun; 1446 putushort(denp[1].deADate, ndirent.de_ADate); 1447 putushort(denp[1].deMDate, ndirent.de_MDate); 1448 putushort(denp[1].deMTime, ndirent.de_MTime); 1449 if (FAT32(pmp)) { 1450 putushort(denp[0].deHighClust, newcluster >> 16); 1451 putushort(denp[1].deHighClust, pcl >> 16); 1452 } 1453 1454 if (DOINGASYNC(ap->a_dvp)) 1455 bdwrite(bp); 1456 else if ((error = bwrite(bp)) != 0) 1457 goto bad; 1458 1459 /* 1460 * Now build up a directory entry pointing to the newly allocated 1461 * cluster. This will be written to an empty slot in the parent 1462 * directory. 1463 */ 1464 #ifdef DIAGNOSTIC 1465 if ((cnp->cn_flags & HASBUF) == 0) 1466 panic("msdosfs_mkdir: no name"); 1467 #endif 1468 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1469 if (error) 1470 goto bad; 1471 1472 ndirent.de_Attributes = ATTR_DIRECTORY; 1473 ndirent.de_LowerCase = 0; 1474 ndirent.de_StartCluster = newcluster; 1475 ndirent.de_FileSize = 0; 1476 error = createde(&ndirent, pdep, &dep, cnp); 1477 if (error) 1478 goto bad; 1479 *ap->a_vpp = DETOV(dep); 1480 return (0); 1481 1482 bad: 1483 clusterfree(pmp, newcluster, NULL); 1484 bad2: 1485 return (error); 1486 } 1487 1488 static int 1489 msdosfs_rmdir(ap) 1490 struct vop_rmdir_args /* { 1491 struct vnode *a_dvp; 1492 struct vnode *a_vp; 1493 struct componentname *a_cnp; 1494 } */ *ap; 1495 { 1496 struct vnode *vp = ap->a_vp; 1497 struct vnode *dvp = ap->a_dvp; 1498 struct componentname *cnp = ap->a_cnp; 1499 struct denode *ip, *dp; 1500 int error; 1501 1502 ip = VTODE(vp); 1503 dp = VTODE(dvp); 1504 1505 /* 1506 * Verify the directory is empty (and valid). 1507 * (Rmdir ".." won't be valid since 1508 * ".." will contain a reference to 1509 * the current directory and thus be 1510 * non-empty.) 1511 */ 1512 error = 0; 1513 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1514 error = ENOTEMPTY; 1515 goto out; 1516 } 1517 /* 1518 * Delete the entry from the directory. For dos filesystems this 1519 * gets rid of the directory entry on disk, the in memory copy 1520 * still exists but the de_refcnt is <= 0. This prevents it from 1521 * being found by deget(). When the vput() on dep is done we give 1522 * up access and eventually msdosfs_reclaim() will be called which 1523 * will remove it from the denode cache. 1524 */ 1525 error = removede(dp, ip); 1526 if (error) 1527 goto out; 1528 /* 1529 * This is where we decrement the link count in the parent 1530 * directory. Since dos filesystems don't do this we just purge 1531 * the name cache. 1532 */ 1533 cache_purge(dvp); 1534 /* 1535 * Truncate the directory that is being deleted. 1536 */ 1537 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1538 cache_purge(vp); 1539 1540 out: 1541 return (error); 1542 } 1543 1544 /* 1545 * DOS filesystems don't know what symlinks are. 1546 */ 1547 static int 1548 msdosfs_symlink(ap) 1549 struct vop_symlink_args /* { 1550 struct vnode *a_dvp; 1551 struct vnode **a_vpp; 1552 struct componentname *a_cnp; 1553 struct vattr *a_vap; 1554 char *a_target; 1555 } */ *ap; 1556 { 1557 return (EOPNOTSUPP); 1558 } 1559 1560 static int 1561 msdosfs_readdir(ap) 1562 struct vop_readdir_args /* { 1563 struct vnode *a_vp; 1564 struct uio *a_uio; 1565 struct ucred *a_cred; 1566 int *a_eofflag; 1567 int *a_ncookies; 1568 u_long **a_cookies; 1569 } */ *ap; 1570 { 1571 struct mbnambuf nb; 1572 int error = 0; 1573 int diff; 1574 long n; 1575 int blsize; 1576 long on; 1577 u_long cn; 1578 uint64_t fileno; 1579 u_long dirsperblk; 1580 long bias = 0; 1581 daddr_t bn, lbn; 1582 struct buf *bp; 1583 struct denode *dep = VTODE(ap->a_vp); 1584 struct msdosfsmount *pmp = dep->de_pmp; 1585 struct direntry *dentp; 1586 struct dirent dirbuf; 1587 struct uio *uio = ap->a_uio; 1588 u_long *cookies = NULL; 1589 int ncookies = 0; 1590 off_t offset, off; 1591 int chksum = -1; 1592 1593 #ifdef MSDOSFS_DEBUG 1594 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1595 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1596 #endif 1597 1598 /* 1599 * msdosfs_readdir() won't operate properly on regular files since 1600 * it does i/o only with the filesystem vnode, and hence can 1601 * retrieve the wrong block from the buffer cache for a plain file. 1602 * So, fail attempts to readdir() on a plain file. 1603 */ 1604 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1605 return (ENOTDIR); 1606 1607 /* 1608 * To be safe, initialize dirbuf 1609 */ 1610 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1611 1612 /* 1613 * If the user buffer is smaller than the size of one dos directory 1614 * entry or the file offset is not a multiple of the size of a 1615 * directory entry, then we fail the read. 1616 */ 1617 off = offset = uio->uio_offset; 1618 if (uio->uio_resid < sizeof(struct direntry) || 1619 (offset & (sizeof(struct direntry) - 1))) 1620 return (EINVAL); 1621 1622 if (ap->a_ncookies) { 1623 ncookies = uio->uio_resid / 16; 1624 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1625 M_WAITOK); 1626 *ap->a_cookies = cookies; 1627 *ap->a_ncookies = ncookies; 1628 } 1629 1630 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1631 1632 /* 1633 * If they are reading from the root directory then, we simulate 1634 * the . and .. entries since these don't exist in the root 1635 * directory. We also set the offset bias to make up for having to 1636 * simulate these entries. By this I mean that at file offset 64 we 1637 * read the first entry in the root directory that lives on disk. 1638 */ 1639 if (dep->de_StartCluster == MSDOSFSROOT 1640 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1641 #if 0 1642 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1643 offset); 1644 #endif 1645 bias = 2 * sizeof(struct direntry); 1646 if (offset < bias) { 1647 for (n = (int)offset / sizeof(struct direntry); 1648 n < 2; n++) { 1649 if (FAT32(pmp)) 1650 fileno = (uint64_t)cntobn(pmp, 1651 pmp->pm_rootdirblk) 1652 * dirsperblk; 1653 else 1654 fileno = 1; 1655 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1656 dirbuf.d_fileno = 1657 msdosfs_fileno_map(pmp->pm_mountp, 1658 fileno); 1659 } else { 1660 1661 dirbuf.d_fileno = (uint32_t)fileno; 1662 } 1663 dirbuf.d_type = DT_DIR; 1664 switch (n) { 1665 case 0: 1666 dirbuf.d_namlen = 1; 1667 strcpy(dirbuf.d_name, "."); 1668 break; 1669 case 1: 1670 dirbuf.d_namlen = 2; 1671 strcpy(dirbuf.d_name, ".."); 1672 break; 1673 } 1674 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1675 if (uio->uio_resid < dirbuf.d_reclen) 1676 goto out; 1677 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1678 if (error) 1679 goto out; 1680 offset += sizeof(struct direntry); 1681 off = offset; 1682 if (cookies) { 1683 *cookies++ = offset; 1684 if (--ncookies <= 0) 1685 goto out; 1686 } 1687 } 1688 } 1689 } 1690 1691 mbnambuf_init(&nb); 1692 off = offset; 1693 while (uio->uio_resid > 0) { 1694 lbn = de_cluster(pmp, offset - bias); 1695 on = (offset - bias) & pmp->pm_crbomask; 1696 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1697 diff = dep->de_FileSize - (offset - bias); 1698 if (diff <= 0) 1699 break; 1700 n = min(n, diff); 1701 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1702 if (error) 1703 break; 1704 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1705 if (error) { 1706 brelse(bp); 1707 return (error); 1708 } 1709 n = min(n, blsize - bp->b_resid); 1710 if (n == 0) { 1711 brelse(bp); 1712 return (EIO); 1713 } 1714 1715 /* 1716 * Convert from dos directory entries to fs-independent 1717 * directory entries. 1718 */ 1719 for (dentp = (struct direntry *)(bp->b_data + on); 1720 (char *)dentp < bp->b_data + on + n; 1721 dentp++, offset += sizeof(struct direntry)) { 1722 #if 0 1723 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1724 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1725 #endif 1726 /* 1727 * If this is an unused entry, we can stop. 1728 */ 1729 if (dentp->deName[0] == SLOT_EMPTY) { 1730 brelse(bp); 1731 goto out; 1732 } 1733 /* 1734 * Skip deleted entries. 1735 */ 1736 if (dentp->deName[0] == SLOT_DELETED) { 1737 chksum = -1; 1738 mbnambuf_init(&nb); 1739 continue; 1740 } 1741 1742 /* 1743 * Handle Win95 long directory entries 1744 */ 1745 if (dentp->deAttributes == ATTR_WIN95) { 1746 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1747 continue; 1748 chksum = win2unixfn(&nb, 1749 (struct winentry *)dentp, chksum, pmp); 1750 continue; 1751 } 1752 1753 /* 1754 * Skip volume labels 1755 */ 1756 if (dentp->deAttributes & ATTR_VOLUME) { 1757 chksum = -1; 1758 mbnambuf_init(&nb); 1759 continue; 1760 } 1761 /* 1762 * This computation of d_fileno must match 1763 * the computation of va_fileid in 1764 * msdosfs_getattr. 1765 */ 1766 if (dentp->deAttributes & ATTR_DIRECTORY) { 1767 fileno = getushort(dentp->deStartCluster); 1768 if (FAT32(pmp)) 1769 fileno |= getushort(dentp->deHighClust) << 16; 1770 /* if this is the root directory */ 1771 if (fileno == MSDOSFSROOT) 1772 if (FAT32(pmp)) 1773 fileno = (uint64_t)cntobn(pmp, 1774 pmp->pm_rootdirblk) 1775 * dirsperblk; 1776 else 1777 fileno = 1; 1778 else 1779 fileno = (uint64_t)cntobn(pmp, fileno) * 1780 dirsperblk; 1781 dirbuf.d_type = DT_DIR; 1782 } else { 1783 fileno = (uoff_t)offset / 1784 sizeof(struct direntry); 1785 dirbuf.d_type = DT_REG; 1786 } 1787 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1788 dirbuf.d_fileno = 1789 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1790 } else 1791 dirbuf.d_fileno = (uint32_t)fileno; 1792 1793 if (chksum != winChksum(dentp->deName)) { 1794 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1795 (u_char *)dirbuf.d_name, 1796 dentp->deLowerCase | 1797 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1798 (LCASE_BASE | LCASE_EXT) : 0), 1799 pmp); 1800 mbnambuf_init(&nb); 1801 } else 1802 mbnambuf_flush(&nb, &dirbuf); 1803 chksum = -1; 1804 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1805 if (uio->uio_resid < dirbuf.d_reclen) { 1806 brelse(bp); 1807 goto out; 1808 } 1809 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1810 if (error) { 1811 brelse(bp); 1812 goto out; 1813 } 1814 if (cookies) { 1815 *cookies++ = offset + sizeof(struct direntry); 1816 if (--ncookies <= 0) { 1817 brelse(bp); 1818 goto out; 1819 } 1820 } 1821 off = offset + sizeof(struct direntry); 1822 } 1823 brelse(bp); 1824 } 1825 out: 1826 /* Subtract unused cookies */ 1827 if (ap->a_ncookies) 1828 *ap->a_ncookies -= ncookies; 1829 1830 uio->uio_offset = off; 1831 1832 /* 1833 * Set the eofflag (NFS uses it) 1834 */ 1835 if (ap->a_eofflag) { 1836 if (dep->de_FileSize - (offset - bias) <= 0) 1837 *ap->a_eofflag = 1; 1838 else 1839 *ap->a_eofflag = 0; 1840 } 1841 return (error); 1842 } 1843 1844 /*- 1845 * a_vp - pointer to the file's vnode 1846 * a_bn - logical block number within the file (cluster number for us) 1847 * a_bop - where to return the bufobj of the special file containing the fs 1848 * a_bnp - where to return the "physical" block number corresponding to a_bn 1849 * (relative to the special file; units are blocks of size DEV_BSIZE) 1850 * a_runp - where to return the "run past" a_bn. This is the count of logical 1851 * blocks whose physical blocks (together with a_bn's physical block) 1852 * are contiguous. 1853 * a_runb - where to return the "run before" a_bn. 1854 */ 1855 static int 1856 msdosfs_bmap(ap) 1857 struct vop_bmap_args /* { 1858 struct vnode *a_vp; 1859 daddr_t a_bn; 1860 struct bufobj **a_bop; 1861 daddr_t *a_bnp; 1862 int *a_runp; 1863 int *a_runb; 1864 } */ *ap; 1865 { 1866 struct denode *dep; 1867 struct mount *mp; 1868 struct msdosfsmount *pmp; 1869 struct vnode *vp; 1870 daddr_t runbn; 1871 u_long cn; 1872 int bnpercn, error, maxio, maxrun, run; 1873 1874 vp = ap->a_vp; 1875 dep = VTODE(vp); 1876 pmp = dep->de_pmp; 1877 if (ap->a_bop != NULL) 1878 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1879 if (ap->a_bnp == NULL) 1880 return (0); 1881 if (ap->a_runp != NULL) 1882 *ap->a_runp = 0; 1883 if (ap->a_runb != NULL) 1884 *ap->a_runb = 0; 1885 cn = ap->a_bn; 1886 if (cn != ap->a_bn) 1887 return (EFBIG); 1888 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1889 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1890 return (error); 1891 1892 mp = vp->v_mount; 1893 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1894 bnpercn = de_cn2bn(pmp, 1); 1895 if (ap->a_runp != NULL) { 1896 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1897 for (run = 1; run <= maxrun; run++) { 1898 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1899 runbn != *ap->a_bnp + run * bnpercn) 1900 break; 1901 } 1902 *ap->a_runp = run - 1; 1903 } 1904 if (ap->a_runb != NULL) { 1905 maxrun = ulmin(maxio - 1, cn); 1906 for (run = 1; run < maxrun; run++) { 1907 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1908 runbn != *ap->a_bnp - run * bnpercn) 1909 break; 1910 } 1911 *ap->a_runb = run - 1; 1912 } 1913 return (0); 1914 } 1915 1916 static int 1917 msdosfs_strategy(ap) 1918 struct vop_strategy_args /* { 1919 struct vnode *a_vp; 1920 struct buf *a_bp; 1921 } */ *ap; 1922 { 1923 struct buf *bp = ap->a_bp; 1924 struct denode *dep = VTODE(ap->a_vp); 1925 struct bufobj *bo; 1926 int error = 0; 1927 daddr_t blkno; 1928 1929 /* 1930 * If we don't already know the filesystem relative block number 1931 * then get it using pcbmap(). If pcbmap() returns the block 1932 * number as -1 then we've got a hole in the file. DOS filesystems 1933 * don't allow files with holes, so we shouldn't ever see this. 1934 */ 1935 if (bp->b_blkno == bp->b_lblkno) { 1936 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1937 bp->b_blkno = blkno; 1938 if (error) { 1939 bp->b_error = error; 1940 bp->b_ioflags |= BIO_ERROR; 1941 bufdone(bp); 1942 return (0); 1943 } 1944 if ((long)bp->b_blkno == -1) 1945 vfs_bio_clrbuf(bp); 1946 } 1947 if (bp->b_blkno == -1) { 1948 bufdone(bp); 1949 return (0); 1950 } 1951 /* 1952 * Read/write the block from/to the disk that contains the desired 1953 * file block. 1954 */ 1955 bp->b_iooffset = dbtob(bp->b_blkno); 1956 bo = dep->de_pmp->pm_bo; 1957 BO_STRATEGY(bo, bp); 1958 return (0); 1959 } 1960 1961 static int 1962 msdosfs_print(ap) 1963 struct vop_print_args /* { 1964 struct vnode *vp; 1965 } */ *ap; 1966 { 1967 struct denode *dep = VTODE(ap->a_vp); 1968 1969 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1970 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1971 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1972 return (0); 1973 } 1974 1975 static int 1976 msdosfs_pathconf(ap) 1977 struct vop_pathconf_args /* { 1978 struct vnode *a_vp; 1979 int a_name; 1980 int *a_retval; 1981 } */ *ap; 1982 { 1983 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1984 1985 switch (ap->a_name) { 1986 case _PC_LINK_MAX: 1987 *ap->a_retval = 1; 1988 return (0); 1989 case _PC_NAME_MAX: 1990 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1991 return (0); 1992 case _PC_PATH_MAX: 1993 *ap->a_retval = PATH_MAX; 1994 return (0); 1995 case _PC_CHOWN_RESTRICTED: 1996 *ap->a_retval = 1; 1997 return (0); 1998 case _PC_NO_TRUNC: 1999 *ap->a_retval = 0; 2000 return (0); 2001 default: 2002 return (EINVAL); 2003 } 2004 /* NOTREACHED */ 2005 } 2006 2007 static int 2008 msdosfs_vptofh(ap) 2009 struct vop_vptofh_args /* { 2010 struct vnode *a_vp; 2011 struct fid *a_fhp; 2012 } */ *ap; 2013 { 2014 struct denode *dep; 2015 struct defid *defhp; 2016 2017 dep = VTODE(ap->a_vp); 2018 defhp = (struct defid *)ap->a_fhp; 2019 defhp->defid_len = sizeof(struct defid); 2020 defhp->defid_dirclust = dep->de_dirclust; 2021 defhp->defid_dirofs = dep->de_diroffset; 2022 /* defhp->defid_gen = dep->de_gen; */ 2023 return (0); 2024 } 2025 2026 /* Global vfs data structures for msdosfs */ 2027 struct vop_vector msdosfs_vnodeops = { 2028 .vop_default = &default_vnodeops, 2029 2030 .vop_access = msdosfs_access, 2031 .vop_bmap = msdosfs_bmap, 2032 .vop_cachedlookup = msdosfs_lookup, 2033 .vop_open = msdosfs_open, 2034 .vop_close = msdosfs_close, 2035 .vop_create = msdosfs_create, 2036 .vop_fsync = msdosfs_fsync, 2037 .vop_getattr = msdosfs_getattr, 2038 .vop_inactive = msdosfs_inactive, 2039 .vop_link = msdosfs_link, 2040 .vop_lookup = vfs_cache_lookup, 2041 .vop_mkdir = msdosfs_mkdir, 2042 .vop_mknod = msdosfs_mknod, 2043 .vop_pathconf = msdosfs_pathconf, 2044 .vop_print = msdosfs_print, 2045 .vop_read = msdosfs_read, 2046 .vop_readdir = msdosfs_readdir, 2047 .vop_reclaim = msdosfs_reclaim, 2048 .vop_remove = msdosfs_remove, 2049 .vop_rename = msdosfs_rename, 2050 .vop_rmdir = msdosfs_rmdir, 2051 .vop_setattr = msdosfs_setattr, 2052 .vop_strategy = msdosfs_strategy, 2053 .vop_symlink = msdosfs_symlink, 2054 .vop_write = msdosfs_write, 2055 .vop_vptofh = msdosfs_vptofh, 2056 };
Cache object: 643dbc6fc7c5c849cfdb44e72836644d
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