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