msdosfs_vfsops.c revision 1.41
1 /* $NetBSD: msdosfs_vfsops.c,v 1.41 2007/01/19 14:49:09 hannken Exp $ */ 2 3 /*- 4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 * All rights reserved. 7 * Original code by Paul Popelka (paulp (at) uts.amdahl.com) (see below). 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /* 35 * Written by Paul Popelka (paulp (at) uts.amdahl.com) 36 * 37 * You can do anything you want with this software, just don't say you wrote 38 * it, and don't remove this notice. 39 * 40 * This software is provided "as is". 41 * 42 * The author supplies this software to be publicly redistributed on the 43 * understanding that the author is not responsible for the correct 44 * functioning of this software in any circumstances and is not liable for 45 * any damages caused by this software. 46 * 47 * October 1992 48 */ 49 50 #include <sys/cdefs.h> 51 __KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.41 2007/01/19 14:49:09 hannken Exp $"); 52 53 #if defined(_KERNEL_OPT) 54 #include "opt_quota.h" 55 #include "opt_compat_netbsd.h" 56 #endif 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/sysctl.h> 61 #include <sys/namei.h> 62 #include <sys/proc.h> 63 #include <sys/kernel.h> 64 #include <sys/vnode.h> 65 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 66 #include <sys/mount.h> 67 #include <sys/buf.h> 68 #include <sys/file.h> 69 #include <sys/device.h> 70 #include <sys/disklabel.h> 71 #include <sys/ioctl.h> 72 #include <sys/malloc.h> 73 #include <sys/dirent.h> 74 #include <sys/stat.h> 75 #include <sys/conf.h> 76 #include <sys/kauth.h> 77 78 #include <fs/msdosfs/bpb.h> 79 #include <fs/msdosfs/bootsect.h> 80 #include <fs/msdosfs/direntry.h> 81 #include <fs/msdosfs/denode.h> 82 #include <fs/msdosfs/msdosfsmount.h> 83 #include <fs/msdosfs/fat.h> 84 85 #define MSDOSFS_NAMEMAX(pmp) \ 86 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 87 88 int msdosfs_mountroot(void); 89 int msdosfs_mount(struct mount *, const char *, void *, 90 struct nameidata *, struct lwp *); 91 int msdosfs_start(struct mount *, int, struct lwp *); 92 int msdosfs_unmount(struct mount *, int, struct lwp *); 93 int msdosfs_root(struct mount *, struct vnode **); 94 int msdosfs_quotactl(struct mount *, int, uid_t, void *, struct lwp *); 95 int msdosfs_statvfs(struct mount *, struct statvfs *, struct lwp *); 96 int msdosfs_sync(struct mount *, int, kauth_cred_t, struct lwp *); 97 int msdosfs_vget(struct mount *, ino_t, struct vnode **); 98 int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **); 99 int msdosfs_vptofh(struct vnode *, struct fid *, size_t *fh_size); 100 101 int msdosfs_mountfs(struct vnode *, struct mount *, struct lwp *, 102 struct msdosfs_args *); 103 104 static int update_mp(struct mount *, struct msdosfs_args *); 105 106 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 107 MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 108 109 #define ROOTNAME "root_device" 110 111 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 112 113 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 114 &msdosfs_vnodeop_opv_desc, 115 NULL, 116 }; 117 118 struct vfsops msdosfs_vfsops = { 119 MOUNT_MSDOS, 120 msdosfs_mount, 121 msdosfs_start, 122 msdosfs_unmount, 123 msdosfs_root, 124 msdosfs_quotactl, 125 msdosfs_statvfs, 126 msdosfs_sync, 127 msdosfs_vget, 128 msdosfs_fhtovp, 129 msdosfs_vptofh, 130 msdosfs_init, 131 msdosfs_reinit, 132 msdosfs_done, 133 msdosfs_mountroot, 134 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 135 vfs_stdextattrctl, 136 vfs_stdsuspendctl, 137 msdosfs_vnodeopv_descs, 138 0, 139 { NULL, NULL }, 140 }; 141 VFS_ATTACH(msdosfs_vfsops); 142 143 static int 144 update_mp(mp, argp) 145 struct mount *mp; 146 struct msdosfs_args *argp; 147 { 148 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 149 int error; 150 151 pmp->pm_gid = argp->gid; 152 pmp->pm_uid = argp->uid; 153 pmp->pm_mask = argp->mask & ALLPERMS; 154 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 155 pmp->pm_gmtoff = argp->gmtoff; 156 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 157 158 /* 159 * GEMDOS knows nothing (yet) about win95 160 */ 161 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 162 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 163 164 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 165 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 166 else if (!(pmp->pm_flags & 167 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 168 struct vnode *rtvp; 169 170 /* 171 * Try to divine whether to support Win'95 long filenames 172 */ 173 if (FAT32(pmp)) 174 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 175 else { 176 if ((error = msdosfs_root(mp, &rtvp)) != 0) 177 return error; 178 pmp->pm_flags |= findwin95(VTODE(rtvp)) 179 ? MSDOSFSMNT_LONGNAME 180 : MSDOSFSMNT_SHORTNAME; 181 vput(rtvp); 182 } 183 } 184 185 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 186 187 return 0; 188 } 189 190 int 191 msdosfs_mountroot() 192 { 193 struct mount *mp; 194 struct lwp *l = curlwp; /* XXX */ 195 int error; 196 struct msdosfs_args args; 197 198 if (device_class(root_device) != DV_DISK) 199 return (ENODEV); 200 201 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 202 vrele(rootvp); 203 return (error); 204 } 205 206 args.flags = MSDOSFSMNT_VERSIONED; 207 args.uid = 0; 208 args.gid = 0; 209 args.mask = 0777; 210 args.version = MSDOSFSMNT_VERSION; 211 args.dirmask = 0777; 212 213 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 214 mp->mnt_op->vfs_refcount--; 215 vfs_unbusy(mp); 216 free(mp, M_MOUNT); 217 return (error); 218 } 219 220 if ((error = update_mp(mp, &args)) != 0) { 221 (void)msdosfs_unmount(mp, 0, l); 222 vfs_unbusy(mp); 223 free(mp, M_MOUNT); 224 vrele(rootvp); 225 return (error); 226 } 227 228 simple_lock(&mountlist_slock); 229 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 230 simple_unlock(&mountlist_slock); 231 (void)msdosfs_statvfs(mp, &mp->mnt_stat, l); 232 vfs_unbusy(mp); 233 return (0); 234 } 235 236 /* 237 * mp - path - addr in user space of mount point (ie /usr or whatever) 238 * data - addr in user space of mount params including the name of the block 239 * special file to treat as a filesystem. 240 */ 241 int 242 msdosfs_mount(mp, path, data, ndp, l) 243 struct mount *mp; 244 const char *path; 245 void *data; 246 struct nameidata *ndp; 247 struct lwp *l; 248 { 249 struct vnode *devvp; /* vnode for blk device to mount */ 250 struct msdosfs_args args; /* will hold data from mount request */ 251 /* msdosfs specific mount control block */ 252 struct msdosfsmount *pmp = NULL; 253 int error, flags; 254 mode_t accessmode; 255 256 if (mp->mnt_flag & MNT_GETARGS) { 257 pmp = VFSTOMSDOSFS(mp); 258 if (pmp == NULL) 259 return EIO; 260 args.fspec = NULL; 261 args.uid = pmp->pm_uid; 262 args.gid = pmp->pm_gid; 263 args.mask = pmp->pm_mask; 264 args.flags = pmp->pm_flags; 265 args.version = MSDOSFSMNT_VERSION; 266 args.dirmask = pmp->pm_dirmask; 267 args.gmtoff = pmp->pm_gmtoff; 268 return copyout(&args, data, sizeof(args)); 269 } 270 error = copyin(data, &args, sizeof(struct msdosfs_args)); 271 if (error) 272 return (error); 273 274 /* 275 * If not versioned (i.e. using old mount_msdos(8)), fill in 276 * the additional structure items with suitable defaults. 277 */ 278 if ((args.flags & MSDOSFSMNT_VERSIONED) == 0) { 279 args.version = 1; 280 args.dirmask = args.mask; 281 } 282 283 /* 284 * Reset GMT offset for pre-v3 mount structure args. 285 */ 286 if (args.version < 3) 287 args.gmtoff = 0; 288 289 /* 290 * If updating, check whether changing from read-only to 291 * read/write; if there is no device name, that's all we do. 292 */ 293 if (mp->mnt_flag & MNT_UPDATE) { 294 pmp = VFSTOMSDOSFS(mp); 295 error = 0; 296 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 297 flags = WRITECLOSE; 298 if (mp->mnt_flag & MNT_FORCE) 299 flags |= FORCECLOSE; 300 error = vflush(mp, NULLVP, flags); 301 } 302 if (!error && (mp->mnt_flag & MNT_RELOAD)) 303 /* not yet implemented */ 304 error = EOPNOTSUPP; 305 if (error) 306 return (error); 307 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 308 /* 309 * If upgrade to read-write by non-root, then verify 310 * that user has necessary permissions on the device. 311 */ 312 if (kauth_authorize_generic(l->l_cred, 313 KAUTH_GENERIC_ISSUSER, NULL) != 0) { 314 devvp = pmp->pm_devvp; 315 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 316 error = VOP_ACCESS(devvp, VREAD | VWRITE, 317 l->l_cred, l); 318 VOP_UNLOCK(devvp, 0); 319 if (error) 320 return (error); 321 } 322 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 323 } 324 if (args.fspec == NULL) 325 return EINVAL; 326 } 327 /* 328 * Not an update, or updating the name: look up the name 329 * and verify that it refers to a sensible block device. 330 */ 331 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, l); 332 if ((error = namei(ndp)) != 0) 333 return (error); 334 devvp = ndp->ni_vp; 335 336 if (devvp->v_type != VBLK) { 337 vrele(devvp); 338 return (ENOTBLK); 339 } 340 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 341 vrele(devvp); 342 return (ENXIO); 343 } 344 /* 345 * If mount by non-root, then verify that user has necessary 346 * permissions on the device. 347 */ 348 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 349 accessmode = VREAD; 350 if ((mp->mnt_flag & MNT_RDONLY) == 0) 351 accessmode |= VWRITE; 352 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 353 error = VOP_ACCESS(devvp, accessmode, l->l_cred, l); 354 VOP_UNLOCK(devvp, 0); 355 if (error) { 356 vrele(devvp); 357 return (error); 358 } 359 } 360 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 361 int xflags; 362 363 /* 364 * Disallow multiple mounts of the same device. 365 * Disallow mounting of a device that is currently in use 366 * (except for root, which might share swap device for 367 * miniroot). 368 */ 369 error = vfs_mountedon(devvp); 370 if (error) 371 goto fail; 372 if (vcount(devvp) > 1 && devvp != rootvp) { 373 error = EBUSY; 374 goto fail; 375 } 376 if (mp->mnt_flag & MNT_RDONLY) 377 xflags = FREAD; 378 else 379 xflags = FREAD|FWRITE; 380 error = VOP_OPEN(devvp, xflags, FSCRED, l); 381 if (error) 382 goto fail; 383 error = msdosfs_mountfs(devvp, mp, l, &args); 384 if (error) { 385 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 386 (void) VOP_CLOSE(devvp, xflags, NOCRED, l); 387 VOP_UNLOCK(devvp, 0); 388 goto fail; 389 } 390 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 391 pmp = VFSTOMSDOSFS(mp); 392 #endif 393 } else { 394 vrele(devvp); 395 if (devvp != pmp->pm_devvp) 396 return (EINVAL); /* needs translation */ 397 } 398 if ((error = update_mp(mp, &args)) != 0) { 399 msdosfs_unmount(mp, MNT_FORCE, l); 400 return error; 401 } 402 403 #ifdef MSDOSFS_DEBUG 404 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 405 #endif 406 return set_statvfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE, 407 mp, l); 408 409 fail: 410 vrele(devvp); 411 return (error); 412 } 413 414 int 415 msdosfs_mountfs(devvp, mp, l, argp) 416 struct vnode *devvp; 417 struct mount *mp; 418 struct lwp *l; 419 struct msdosfs_args *argp; 420 { 421 struct msdosfsmount *pmp; 422 struct buf *bp; 423 dev_t dev = devvp->v_rdev; 424 struct partinfo dpart; 425 union bootsector *bsp; 426 struct byte_bpb33 *b33; 427 struct byte_bpb50 *b50; 428 struct byte_bpb710 *b710; 429 u_int8_t SecPerClust; 430 int ronly, error; 431 int bsize = 0, dtype = 0, tmp; 432 433 /* Flush out any old buffers remaining from a previous use. */ 434 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 435 return (error); 436 437 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 438 439 bp = NULL; /* both used in error_exit */ 440 pmp = NULL; 441 442 /* 443 * We need the disklabel to calculate the size of a FAT entry 444 * later on. Also make sure the partition contains a filesystem 445 * of type FS_MSDOS. This doesn't work for floppies, so we have 446 * to check for them too. 447 * 448 * There might still be parts of the msdos fs driver which assume 449 * that the size of a disk block will always be 512 bytes. 450 * Let's root them out... 451 */ 452 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, l); 453 if (error) 454 goto error_exit; 455 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 456 tmp = dpart.part->p_fstype; 457 dtype = dpart.disklab->d_type; 458 bsize = dpart.disklab->d_secsize; 459 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 460 error = EINVAL; 461 goto error_exit; 462 } 463 } 464 465 /* 466 * Read the boot sector of the filesystem, and then check the 467 * boot signature. If not a dos boot sector then error out. 468 */ 469 if ((error = bread(devvp, 0, dpart.disklab->d_secsize, NOCRED, 470 &bp)) != 0) 471 goto error_exit; 472 bp->b_flags |= B_AGE; 473 bsp = (union bootsector *)bp->b_data; 474 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 475 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 476 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 477 478 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 479 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 480 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 481 error = EINVAL; 482 goto error_exit; 483 } 484 } 485 486 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 487 memset(pmp, 0, sizeof *pmp); 488 pmp->pm_mountp = mp; 489 490 /* 491 * Compute several useful quantities from the bpb in the 492 * bootsector. Copy in the dos 5 variant of the bpb then fix up 493 * the fields that are different between dos 5 and dos 3.3. 494 */ 495 SecPerClust = b50->bpbSecPerClust; 496 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 497 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 498 pmp->pm_FATs = b50->bpbFATs; 499 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 500 pmp->pm_Sectors = getushort(b50->bpbSectors); 501 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 502 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 503 pmp->pm_Heads = getushort(b50->bpbHeads); 504 pmp->pm_Media = b50->bpbMedia; 505 506 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 507 /* XXX - We should probably check more values here */ 508 if (!pmp->pm_BytesPerSec || !SecPerClust 509 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 510 error = EINVAL; 511 goto error_exit; 512 } 513 } 514 515 if (pmp->pm_Sectors == 0) { 516 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 517 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 518 } else { 519 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 520 pmp->pm_HugeSectors = pmp->pm_Sectors; 521 } 522 523 if (pmp->pm_RootDirEnts == 0) { 524 /* 525 * Some say that bsBootSectSig[23] must be zero, but 526 * Windows does not require this and some digital cameras 527 * do not set these to zero. Therefore, do not insist. 528 */ 529 if (pmp->pm_Sectors 530 || pmp->pm_FATsecs 531 || getushort(b710->bpbFSVers)) { 532 error = EINVAL; 533 goto error_exit; 534 } 535 pmp->pm_fatmask = FAT32_MASK; 536 pmp->pm_fatmult = 4; 537 pmp->pm_fatdiv = 1; 538 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 539 540 /* mirrorring is enabled if the FATMIRROR bit is not set */ 541 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 542 pmp->pm_flags |= MSDOSFS_FATMIRROR; 543 else 544 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 545 } else 546 pmp->pm_flags |= MSDOSFS_FATMIRROR; 547 548 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 549 if (FAT32(pmp)) { 550 /* 551 * GEMDOS doesn't know fat32. 552 */ 553 error = EINVAL; 554 goto error_exit; 555 } 556 557 /* 558 * Check a few values (could do some more): 559 * - logical sector size: power of 2, >= block size 560 * - sectors per cluster: power of 2, >= 1 561 * - number of sectors: >= 1, <= size of partition 562 */ 563 if ( (SecPerClust == 0) 564 || (SecPerClust & (SecPerClust - 1)) 565 || (pmp->pm_BytesPerSec < bsize) 566 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 567 || (pmp->pm_HugeSectors == 0) 568 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 569 > dpart.part->p_size) 570 ) { 571 error = EINVAL; 572 goto error_exit; 573 } 574 /* 575 * XXX - Many parts of the msdos fs driver seem to assume that 576 * the number of bytes per logical sector (BytesPerSec) will 577 * always be the same as the number of bytes per disk block 578 * Let's pretend it is. 579 */ 580 tmp = pmp->pm_BytesPerSec / bsize; 581 pmp->pm_BytesPerSec = bsize; 582 pmp->pm_HugeSectors *= tmp; 583 pmp->pm_HiddenSects *= tmp; 584 pmp->pm_ResSectors *= tmp; 585 pmp->pm_Sectors *= tmp; 586 pmp->pm_FATsecs *= tmp; 587 SecPerClust *= tmp; 588 } 589 pmp->pm_fatblk = pmp->pm_ResSectors; 590 if (FAT32(pmp)) { 591 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 592 pmp->pm_firstcluster = pmp->pm_fatblk 593 + (pmp->pm_FATs * pmp->pm_FATsecs); 594 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 595 } else { 596 pmp->pm_rootdirblk = pmp->pm_fatblk + 597 (pmp->pm_FATs * pmp->pm_FATsecs); 598 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 599 + pmp->pm_BytesPerSec - 1) 600 / pmp->pm_BytesPerSec;/* in sectors */ 601 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 602 } 603 604 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 605 SecPerClust; 606 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 607 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 608 609 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 610 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 611 && (dtype == DTYPE_FLOPPY 612 || (dtype == DTYPE_VND 613 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 614 ) { 615 pmp->pm_fatmask = FAT12_MASK; 616 pmp->pm_fatmult = 3; 617 pmp->pm_fatdiv = 2; 618 } else { 619 pmp->pm_fatmask = FAT16_MASK; 620 pmp->pm_fatmult = 2; 621 pmp->pm_fatdiv = 1; 622 } 623 } else if (pmp->pm_fatmask == 0) { 624 if (pmp->pm_maxcluster 625 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 626 /* 627 * This will usually be a floppy disk. This size makes 628 * sure that one fat entry will not be split across 629 * multiple blocks. 630 */ 631 pmp->pm_fatmask = FAT12_MASK; 632 pmp->pm_fatmult = 3; 633 pmp->pm_fatdiv = 2; 634 } else { 635 pmp->pm_fatmask = FAT16_MASK; 636 pmp->pm_fatmult = 2; 637 pmp->pm_fatdiv = 1; 638 } 639 } 640 if (FAT12(pmp)) 641 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 642 else 643 pmp->pm_fatblocksize = MAXBSIZE; 644 645 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 646 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 647 648 /* 649 * Compute mask and shift value for isolating cluster relative byte 650 * offsets and cluster numbers from a file offset. 651 */ 652 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 653 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 654 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 655 656 /* 657 * Check for valid cluster size 658 * must be a power of 2 659 */ 660 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 661 error = EINVAL; 662 goto error_exit; 663 } 664 665 /* 666 * Release the bootsector buffer. 667 */ 668 brelse(bp); 669 bp = NULL; 670 671 /* 672 * Check FSInfo. 673 */ 674 if (pmp->pm_fsinfo) { 675 struct fsinfo *fp; 676 677 /* 678 * XXX If the fsinfo block is stored on media with 679 * 2KB or larger sectors, is the fsinfo structure 680 * padded at the end or in the middle? 681 */ 682 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 683 pmp->pm_BytesPerSec, NOCRED, &bp)) != 0) 684 goto error_exit; 685 fp = (struct fsinfo *)bp->b_data; 686 if (!memcmp(fp->fsisig1, "RRaA", 4) 687 && !memcmp(fp->fsisig2, "rrAa", 4) 688 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 689 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 690 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 691 else 692 pmp->pm_fsinfo = 0; 693 brelse(bp); 694 bp = NULL; 695 } 696 697 /* 698 * Check and validate (or perhaps invalidate?) the fsinfo structure? 699 * XXX 700 */ 701 if (pmp->pm_fsinfo) { 702 if (pmp->pm_nxtfree == (u_long)-1) 703 pmp->pm_fsinfo = 0; 704 } 705 706 /* 707 * Allocate memory for the bitmap of allocated clusters, and then 708 * fill it in. 709 */ 710 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 711 / N_INUSEBITS) 712 * sizeof(*pmp->pm_inusemap), 713 M_MSDOSFSFAT, M_WAITOK); 714 715 /* 716 * fillinusemap() needs pm_devvp. 717 */ 718 pmp->pm_dev = dev; 719 pmp->pm_devvp = devvp; 720 721 /* 722 * Have the inuse map filled in. 723 */ 724 if ((error = fillinusemap(pmp)) != 0) 725 goto error_exit; 726 727 /* 728 * If they want fat updates to be synchronous then let them suffer 729 * the performance degradation in exchange for the on disk copy of 730 * the fat being correct just about all the time. I suppose this 731 * would be a good thing to turn on if the kernel is still flakey. 732 */ 733 if (mp->mnt_flag & MNT_SYNCHRONOUS) 734 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 735 736 /* 737 * Finish up. 738 */ 739 if (ronly) 740 pmp->pm_flags |= MSDOSFSMNT_RONLY; 741 else 742 pmp->pm_fmod = 1; 743 mp->mnt_data = pmp; 744 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 745 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 746 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 747 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 748 mp->mnt_flag |= MNT_LOCAL; 749 mp->mnt_dev_bshift = pmp->pm_bnshift; 750 mp->mnt_fs_bshift = pmp->pm_cnshift; 751 752 #ifdef QUOTA 753 /* 754 * If we ever do quotas for DOS filesystems this would be a place 755 * to fill in the info in the msdosfsmount structure. You dolt, 756 * quotas on dos filesystems make no sense because files have no 757 * owners on dos filesystems. of course there is some empty space 758 * in the directory entry where we could put uid's and gid's. 759 */ 760 #endif 761 devvp->v_specmountpoint = mp; 762 763 return (0); 764 765 error_exit:; 766 if (bp) 767 brelse(bp); 768 if (pmp) { 769 if (pmp->pm_inusemap) 770 free(pmp->pm_inusemap, M_MSDOSFSFAT); 771 free(pmp, M_MSDOSFSMNT); 772 mp->mnt_data = NULL; 773 } 774 return (error); 775 } 776 777 int 778 msdosfs_start(struct mount *mp, int flags, 779 struct lwp *l) 780 { 781 782 return (0); 783 } 784 785 /* 786 * Unmount the filesystem described by mp. 787 */ 788 int 789 msdosfs_unmount(mp, mntflags, l) 790 struct mount *mp; 791 int mntflags; 792 struct lwp *l; 793 { 794 struct msdosfsmount *pmp; 795 int error, flags; 796 797 flags = 0; 798 if (mntflags & MNT_FORCE) 799 flags |= FORCECLOSE; 800 #ifdef QUOTA 801 #endif 802 if ((error = vflush(mp, NULLVP, flags)) != 0) 803 return (error); 804 pmp = VFSTOMSDOSFS(mp); 805 if (pmp->pm_devvp->v_type != VBAD) 806 pmp->pm_devvp->v_specmountpoint = NULL; 807 #ifdef MSDOSFS_DEBUG 808 { 809 struct vnode *vp = pmp->pm_devvp; 810 811 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 812 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 813 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 814 printf("mount %p, op %p\n", 815 vp->v_mount, vp->v_op); 816 printf("freef %p, freeb %p, mount %p\n", 817 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 818 vp->v_mount); 819 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 820 vp->v_cleanblkhd.lh_first, 821 vp->v_dirtyblkhd.lh_first, 822 vp->v_numoutput, vp->v_type); 823 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 824 vp->v_socket, vp->v_tag, 825 ((u_int *)vp->v_data)[0], 826 ((u_int *)vp->v_data)[1]); 827 } 828 #endif 829 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 830 error = VOP_CLOSE(pmp->pm_devvp, 831 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, l); 832 vput(pmp->pm_devvp); 833 free(pmp->pm_inusemap, M_MSDOSFSFAT); 834 free(pmp, M_MSDOSFSMNT); 835 mp->mnt_data = NULL; 836 mp->mnt_flag &= ~MNT_LOCAL; 837 return (error); 838 } 839 840 int 841 msdosfs_root(mp, vpp) 842 struct mount *mp; 843 struct vnode **vpp; 844 { 845 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 846 struct denode *ndep; 847 int error; 848 849 #ifdef MSDOSFS_DEBUG 850 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 851 #endif 852 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 853 return (error); 854 *vpp = DETOV(ndep); 855 return (0); 856 } 857 858 int 859 msdosfs_quotactl(struct mount *mp, int cmds, 860 uid_t uid, void *arg, struct lwp *l) 861 { 862 863 return (EOPNOTSUPP); 864 } 865 866 int 867 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp, struct lwp *l) 868 { 869 struct msdosfsmount *pmp; 870 871 pmp = VFSTOMSDOSFS(mp); 872 sbp->f_bsize = pmp->pm_bpcluster; 873 sbp->f_frsize = sbp->f_bsize; 874 sbp->f_iosize = pmp->pm_bpcluster; 875 sbp->f_blocks = pmp->pm_nmbrofclusters; 876 sbp->f_bfree = pmp->pm_freeclustercount; 877 sbp->f_bavail = pmp->pm_freeclustercount; 878 sbp->f_bresvd = 0; 879 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 880 sbp->f_ffree = 0; /* what to put in here? */ 881 sbp->f_favail = 0; /* what to put in here? */ 882 sbp->f_fresvd = 0; 883 copy_statvfs_info(sbp, mp); 884 return (0); 885 } 886 887 int 888 msdosfs_sync(mp, waitfor, cred, l) 889 struct mount *mp; 890 int waitfor; 891 kauth_cred_t cred; 892 struct lwp *l; 893 { 894 struct vnode *vp, *nvp; 895 struct denode *dep; 896 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 897 int error, allerror = 0; 898 899 /* 900 * If we ever switch to not updating all of the fats all the time, 901 * this would be the place to update them from the first one. 902 */ 903 if (pmp->pm_fmod != 0) { 904 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 905 panic("msdosfs_sync: rofs mod"); 906 else { 907 /* update fats here */ 908 } 909 } 910 /* 911 * Write back each (modified) denode. 912 */ 913 simple_lock(&mntvnode_slock); 914 loop: 915 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = nvp) { 916 /* 917 * If the vnode that we are about to sync is no longer 918 * assoicated with this mount point, start over. 919 */ 920 if (vp->v_mount != mp) 921 goto loop; 922 simple_lock(&vp->v_interlock); 923 nvp = TAILQ_NEXT(vp, v_mntvnodes); 924 dep = VTODE(vp); 925 if (waitfor == MNT_LAZY || vp->v_type == VNON || 926 (((dep->de_flag & 927 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 928 (LIST_EMPTY(&vp->v_dirtyblkhd) && 929 vp->v_uobj.uo_npages == 0))) { 930 simple_unlock(&vp->v_interlock); 931 continue; 932 } 933 simple_unlock(&mntvnode_slock); 934 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 935 if (error) { 936 simple_lock(&mntvnode_slock); 937 if (error == ENOENT) 938 goto loop; 939 continue; 940 } 941 if ((error = VOP_FSYNC(vp, cred, 942 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l)) != 0) 943 allerror = error; 944 vput(vp); 945 simple_lock(&mntvnode_slock); 946 } 947 simple_unlock(&mntvnode_slock); 948 /* 949 * Force stale file system control information to be flushed. 950 */ 951 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 952 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l)) != 0) 953 allerror = error; 954 #ifdef QUOTA 955 /* qsync(mp); */ 956 #endif 957 return (allerror); 958 } 959 960 int 961 msdosfs_fhtovp(mp, fhp, vpp) 962 struct mount *mp; 963 struct fid *fhp; 964 struct vnode **vpp; 965 { 966 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 967 struct defid defh; 968 struct denode *dep; 969 int error; 970 971 if (fhp->fid_len != sizeof(struct defid)) 972 return EINVAL; 973 974 memcpy(&defh, fhp, sizeof(defh)); 975 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 976 if (error) { 977 *vpp = NULLVP; 978 return (error); 979 } 980 *vpp = DETOV(dep); 981 return (0); 982 } 983 984 int 985 msdosfs_vptofh(vp, fhp, fh_size) 986 struct vnode *vp; 987 struct fid *fhp; 988 size_t *fh_size; 989 { 990 struct denode *dep; 991 struct defid defh; 992 993 if (*fh_size < sizeof(struct defid)) { 994 *fh_size = sizeof(struct defid); 995 return E2BIG; 996 } 997 *fh_size = sizeof(struct defid); 998 dep = VTODE(vp); 999 memset(&defh, 0, sizeof(defh)); 1000 defh.defid_len = sizeof(struct defid); 1001 defh.defid_dirclust = dep->de_dirclust; 1002 defh.defid_dirofs = dep->de_diroffset; 1003 /* defh.defid_gen = dep->de_gen; */ 1004 memcpy(fhp, &defh, sizeof(defh)); 1005 return (0); 1006 } 1007 1008 int 1009 msdosfs_vget(struct mount *mp, ino_t ino, 1010 struct vnode **vpp) 1011 { 1012 1013 return (EOPNOTSUPP); 1014 } 1015 1016 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1017 { 1018 1019 sysctl_createv(clog, 0, NULL, NULL, 1020 CTLFLAG_PERMANENT, 1021 CTLTYPE_NODE, "vfs", NULL, 1022 NULL, 0, NULL, 0, 1023 CTL_VFS, CTL_EOL); 1024 sysctl_createv(clog, 0, NULL, NULL, 1025 CTLFLAG_PERMANENT, 1026 CTLTYPE_NODE, "msdosfs", 1027 SYSCTL_DESCR("MS-DOS file system"), 1028 NULL, 0, NULL, 0, 1029 CTL_VFS, 4, CTL_EOL); 1030 /* 1031 * XXX the "4" above could be dynamic, thereby eliminating one 1032 * more instance of the "number to vfs" mapping problem, but 1033 * "4" is the order as taken from sys/mount.h 1034 */ 1035 } 1036
Indexes created Sat Sep 27 22:09:54 GMT 2025