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sys/fs/msdosfs/msdosfs_vfsops.c
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1 /* $NetBSD: msdosfs_vfsops.c,v 1.40.2.1 2007/02/27 23:11:36 riz 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@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@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 1.40.2.1 2007/02/27 23:11:36 riz 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/disk.h> 72 #include <sys/ioctl.h> 73 #include <sys/malloc.h> 74 #include <sys/dirent.h> 75 #include <sys/stat.h> 76 #include <sys/conf.h> 77 #include <sys/kauth.h> 78 79 #include <fs/msdosfs/bpb.h> 80 #include <fs/msdosfs/bootsect.h> 81 #include <fs/msdosfs/direntry.h> 82 #include <fs/msdosfs/denode.h> 83 #include <fs/msdosfs/msdosfsmount.h> 84 #include <fs/msdosfs/fat.h> 85 86 #define MSDOSFS_NAMEMAX(pmp) \ 87 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 88 89 int msdosfs_mountroot(void); 90 int msdosfs_mount(struct mount *, const char *, void *, 91 struct nameidata *, struct lwp *); 92 int msdosfs_start(struct mount *, int, struct lwp *); 93 int msdosfs_unmount(struct mount *, int, struct lwp *); 94 int msdosfs_root(struct mount *, struct vnode **); 95 int msdosfs_quotactl(struct mount *, int, uid_t, void *, struct lwp *); 96 int msdosfs_statvfs(struct mount *, struct statvfs *, struct lwp *); 97 int msdosfs_sync(struct mount *, int, kauth_cred_t, struct lwp *); 98 int msdosfs_vget(struct mount *, ino_t, struct vnode **); 99 int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **); 100 int msdosfs_vptofh(struct vnode *, struct fid *, size_t *fh_size); 101 102 int msdosfs_mountfs(struct vnode *, struct mount *, struct lwp *, 103 struct msdosfs_args *); 104 105 static int update_mp(struct mount *, struct msdosfs_args *); 106 107 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 108 MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 109 110 #define ROOTNAME "root_device" 111 112 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 113 114 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 115 &msdosfs_vnodeop_opv_desc, 116 NULL, 117 }; 118 119 struct vfsops msdosfs_vfsops = { 120 MOUNT_MSDOS, 121 msdosfs_mount, 122 msdosfs_start, 123 msdosfs_unmount, 124 msdosfs_root, 125 msdosfs_quotactl, 126 msdosfs_statvfs, 127 msdosfs_sync, 128 msdosfs_vget, 129 msdosfs_fhtovp, 130 msdosfs_vptofh, 131 msdosfs_init, 132 msdosfs_reinit, 133 msdosfs_done, 134 msdosfs_mountroot, 135 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 136 vfs_stdextattrctl, 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, tmp; 431 int bsize, dtype, fstype, secsize; 432 u_int64_t psize; 433 434 /* Flush out any old buffers remaining from a previous use. */ 435 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 436 return (error); 437 438 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 439 440 bp = NULL; /* both used in error_exit */ 441 pmp = NULL; 442 443 /* 444 * We need the disklabel to calculate the size of a FAT entry 445 * later on. Also make sure the partition contains a filesystem 446 * of type FS_MSDOS. This doesn't work for floppies, so we have 447 * to check for them too. 448 * 449 * There might still be parts of the msdos fs driver which assume 450 * that the size of a disk block will always be 512 bytes. 451 * Let's root them out... 452 */ 453 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, l); 454 if (error == 0) { 455 secsize = dpart.disklab->d_secsize; 456 dtype = dpart.disklab->d_type; 457 fstype = dpart.part->p_fstype; 458 psize = dpart.part->p_size; 459 } else { 460 struct dkwedge_info dkw; 461 error = VOP_IOCTL(devvp, DIOCGWEDGEINFO, &dkw, FREAD, 462 NOCRED, l); 463 secsize = 512; /* XXX */ 464 dtype = DTYPE_FLOPPY; /* XXX */ 465 fstype = FS_MSDOS; 466 psize = -1; 467 if (error) { 468 if (error != ENOTTY) 469 goto error_exit; 470 } else { 471 fstype = strcmp(dkw.dkw_ptype, DKW_PTYPE_FAT) == 0 ? 472 FS_MSDOS : -1; 473 psize = dkw.dkw_size; 474 } 475 } 476 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 477 bsize = secsize; 478 if (bsize != 512 || 479 (dtype != DTYPE_FLOPPY && fstype != FS_MSDOS)) { 480 error = EINVAL; 481 goto error_exit; 482 } 483 } else 484 bsize = 0; 485 486 /* 487 * Read the boot sector of the filesystem, and then check the 488 * boot signature. If not a dos boot sector then error out. 489 */ 490 if ((error = bread(devvp, 0, secsize, NOCRED, &bp)) != 0) 491 goto error_exit; 492 bp->b_flags |= B_AGE; 493 bsp = (union bootsector *)bp->b_data; 494 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 495 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 496 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 497 498 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 499 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 500 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 501 error = EINVAL; 502 goto error_exit; 503 } 504 } 505 506 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 507 memset(pmp, 0, sizeof *pmp); 508 pmp->pm_mountp = mp; 509 510 /* 511 * Compute several useful quantities from the bpb in the 512 * bootsector. Copy in the dos 5 variant of the bpb then fix up 513 * the fields that are different between dos 5 and dos 3.3. 514 */ 515 SecPerClust = b50->bpbSecPerClust; 516 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 517 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 518 pmp->pm_FATs = b50->bpbFATs; 519 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 520 pmp->pm_Sectors = getushort(b50->bpbSectors); 521 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 522 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 523 pmp->pm_Heads = getushort(b50->bpbHeads); 524 pmp->pm_Media = b50->bpbMedia; 525 526 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 527 /* XXX - We should probably check more values here */ 528 if (!pmp->pm_BytesPerSec || !SecPerClust 529 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 530 error = EINVAL; 531 goto error_exit; 532 } 533 } 534 535 if (pmp->pm_Sectors == 0) { 536 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 537 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 538 } else { 539 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 540 pmp->pm_HugeSectors = pmp->pm_Sectors; 541 } 542 543 if (pmp->pm_RootDirEnts == 0) { 544 unsigned short vers = getushort(b710->bpbFSVers); 545 /* 546 * Some say that bsBootSectSig[23] must be zero, but 547 * Windows does not require this and some digital cameras 548 * do not set these to zero. Therefore, do not insist. 549 */ 550 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 551 error = EINVAL; 552 goto error_exit; 553 } 554 pmp->pm_fatmask = FAT32_MASK; 555 pmp->pm_fatmult = 4; 556 pmp->pm_fatdiv = 1; 557 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 558 559 /* mirrorring is enabled if the FATMIRROR bit is not set */ 560 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 561 pmp->pm_flags |= MSDOSFS_FATMIRROR; 562 else 563 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 564 } else 565 pmp->pm_flags |= MSDOSFS_FATMIRROR; 566 567 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 568 if (FAT32(pmp)) { 569 /* 570 * GEMDOS doesn't know fat32. 571 */ 572 error = EINVAL; 573 goto error_exit; 574 } 575 576 /* 577 * Check a few values (could do some more): 578 * - logical sector size: power of 2, >= block size 579 * - sectors per cluster: power of 2, >= 1 580 * - number of sectors: >= 1, <= size of partition 581 */ 582 if ( (SecPerClust == 0) 583 || (SecPerClust & (SecPerClust - 1)) 584 || (pmp->pm_BytesPerSec < bsize) 585 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 586 || (pmp->pm_HugeSectors == 0) 587 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 588 > psize)) { 589 error = EINVAL; 590 goto error_exit; 591 } 592 /* 593 * XXX - Many parts of the msdos fs driver seem to assume that 594 * the number of bytes per logical sector (BytesPerSec) will 595 * always be the same as the number of bytes per disk block 596 * Let's pretend it is. 597 */ 598 tmp = pmp->pm_BytesPerSec / bsize; 599 pmp->pm_BytesPerSec = bsize; 600 pmp->pm_HugeSectors *= tmp; 601 pmp->pm_HiddenSects *= tmp; 602 pmp->pm_ResSectors *= tmp; 603 pmp->pm_Sectors *= tmp; 604 pmp->pm_FATsecs *= tmp; 605 SecPerClust *= tmp; 606 } 607 pmp->pm_fatblk = pmp->pm_ResSectors; 608 if (FAT32(pmp)) { 609 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 610 pmp->pm_firstcluster = pmp->pm_fatblk 611 + (pmp->pm_FATs * pmp->pm_FATsecs); 612 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 613 } else { 614 pmp->pm_rootdirblk = pmp->pm_fatblk + 615 (pmp->pm_FATs * pmp->pm_FATsecs); 616 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 617 + pmp->pm_BytesPerSec - 1) 618 / pmp->pm_BytesPerSec;/* in sectors */ 619 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 620 } 621 622 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 623 SecPerClust; 624 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 625 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 626 627 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 628 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 629 && (dtype == DTYPE_FLOPPY 630 || (dtype == DTYPE_VND 631 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 632 ) { 633 pmp->pm_fatmask = FAT12_MASK; 634 pmp->pm_fatmult = 3; 635 pmp->pm_fatdiv = 2; 636 } else { 637 pmp->pm_fatmask = FAT16_MASK; 638 pmp->pm_fatmult = 2; 639 pmp->pm_fatdiv = 1; 640 } 641 } else if (pmp->pm_fatmask == 0) { 642 if (pmp->pm_maxcluster 643 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 644 /* 645 * This will usually be a floppy disk. This size makes 646 * sure that one fat entry will not be split across 647 * multiple blocks. 648 */ 649 pmp->pm_fatmask = FAT12_MASK; 650 pmp->pm_fatmult = 3; 651 pmp->pm_fatdiv = 2; 652 } else { 653 pmp->pm_fatmask = FAT16_MASK; 654 pmp->pm_fatmult = 2; 655 pmp->pm_fatdiv = 1; 656 } 657 } 658 if (FAT12(pmp)) 659 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 660 else 661 pmp->pm_fatblocksize = MAXBSIZE; 662 663 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 664 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 665 666 /* 667 * Compute mask and shift value for isolating cluster relative byte 668 * offsets and cluster numbers from a file offset. 669 */ 670 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 671 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 672 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 673 674 /* 675 * Check for valid cluster size 676 * must be a power of 2 677 */ 678 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 679 error = EINVAL; 680 goto error_exit; 681 } 682 683 /* 684 * Release the bootsector buffer. 685 */ 686 brelse(bp); 687 bp = NULL; 688 689 /* 690 * Check FSInfo. 691 */ 692 if (pmp->pm_fsinfo) { 693 struct fsinfo *fp; 694 695 /* 696 * XXX If the fsinfo block is stored on media with 697 * 2KB or larger sectors, is the fsinfo structure 698 * padded at the end or in the middle? 699 */ 700 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 701 pmp->pm_BytesPerSec, NOCRED, &bp)) != 0) 702 goto error_exit; 703 fp = (struct fsinfo *)bp->b_data; 704 if (!memcmp(fp->fsisig1, "RRaA", 4) 705 && !memcmp(fp->fsisig2, "rrAa", 4) 706 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 707 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 708 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 709 else 710 pmp->pm_fsinfo = 0; 711 brelse(bp); 712 bp = NULL; 713 } 714 715 /* 716 * Check and validate (or perhaps invalidate?) the fsinfo structure? 717 * XXX 718 */ 719 if (pmp->pm_fsinfo) { 720 if (pmp->pm_nxtfree == (u_long)-1) 721 pmp->pm_fsinfo = 0; 722 } 723 724 /* 725 * Allocate memory for the bitmap of allocated clusters, and then 726 * fill it in. 727 */ 728 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 729 / N_INUSEBITS) 730 * sizeof(*pmp->pm_inusemap), 731 M_MSDOSFSFAT, M_WAITOK); 732 733 /* 734 * fillinusemap() needs pm_devvp. 735 */ 736 pmp->pm_dev = dev; 737 pmp->pm_devvp = devvp; 738 739 /* 740 * Have the inuse map filled in. 741 */ 742 if ((error = fillinusemap(pmp)) != 0) 743 goto error_exit; 744 745 /* 746 * If they want fat updates to be synchronous then let them suffer 747 * the performance degradation in exchange for the on disk copy of 748 * the fat being correct just about all the time. I suppose this 749 * would be a good thing to turn on if the kernel is still flakey. 750 */ 751 if (mp->mnt_flag & MNT_SYNCHRONOUS) 752 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 753 754 /* 755 * Finish up. 756 */ 757 if (ronly) 758 pmp->pm_flags |= MSDOSFSMNT_RONLY; 759 else 760 pmp->pm_fmod = 1; 761 mp->mnt_data = pmp; 762 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 763 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 764 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 765 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 766 mp->mnt_flag |= MNT_LOCAL; 767 mp->mnt_dev_bshift = pmp->pm_bnshift; 768 mp->mnt_fs_bshift = pmp->pm_cnshift; 769 770 #ifdef QUOTA 771 /* 772 * If we ever do quotas for DOS filesystems this would be a place 773 * to fill in the info in the msdosfsmount structure. You dolt, 774 * quotas on dos filesystems make no sense because files have no 775 * owners on dos filesystems. of course there is some empty space 776 * in the directory entry where we could put uid's and gid's. 777 */ 778 #endif 779 devvp->v_specmountpoint = mp; 780 781 return (0); 782 783 error_exit:; 784 if (bp) 785 brelse(bp); 786 if (pmp) { 787 if (pmp->pm_inusemap) 788 free(pmp->pm_inusemap, M_MSDOSFSFAT); 789 free(pmp, M_MSDOSFSMNT); 790 mp->mnt_data = NULL; 791 } 792 return (error); 793 } 794 795 int 796 msdosfs_start(struct mount *mp, int flags, 797 struct lwp *l) 798 { 799 800 return (0); 801 } 802 803 /* 804 * Unmount the filesystem described by mp. 805 */ 806 int 807 msdosfs_unmount(mp, mntflags, l) 808 struct mount *mp; 809 int mntflags; 810 struct lwp *l; 811 { 812 struct msdosfsmount *pmp; 813 int error, flags; 814 815 flags = 0; 816 if (mntflags & MNT_FORCE) 817 flags |= FORCECLOSE; 818 #ifdef QUOTA 819 #endif 820 if ((error = vflush(mp, NULLVP, flags)) != 0) 821 return (error); 822 pmp = VFSTOMSDOSFS(mp); 823 if (pmp->pm_devvp->v_type != VBAD) 824 pmp->pm_devvp->v_specmountpoint = NULL; 825 #ifdef MSDOSFS_DEBUG 826 { 827 struct vnode *vp = pmp->pm_devvp; 828 829 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 830 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 831 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 832 printf("mount %p, op %p\n", 833 vp->v_mount, vp->v_op); 834 printf("freef %p, freeb %p, mount %p\n", 835 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 836 vp->v_mount); 837 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 838 vp->v_cleanblkhd.lh_first, 839 vp->v_dirtyblkhd.lh_first, 840 vp->v_numoutput, vp->v_type); 841 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 842 vp->v_socket, vp->v_tag, 843 ((u_int *)vp->v_data)[0], 844 ((u_int *)vp->v_data)[1]); 845 } 846 #endif 847 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 848 error = VOP_CLOSE(pmp->pm_devvp, 849 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, l); 850 vput(pmp->pm_devvp); 851 free(pmp->pm_inusemap, M_MSDOSFSFAT); 852 free(pmp, M_MSDOSFSMNT); 853 mp->mnt_data = NULL; 854 mp->mnt_flag &= ~MNT_LOCAL; 855 return (error); 856 } 857 858 int 859 msdosfs_root(mp, vpp) 860 struct mount *mp; 861 struct vnode **vpp; 862 { 863 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 864 struct denode *ndep; 865 int error; 866 867 #ifdef MSDOSFS_DEBUG 868 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 869 #endif 870 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 871 return (error); 872 *vpp = DETOV(ndep); 873 return (0); 874 } 875 876 int 877 msdosfs_quotactl(struct mount *mp, int cmds, 878 uid_t uid, void *arg, struct lwp *l) 879 { 880 881 return (EOPNOTSUPP); 882 } 883 884 int 885 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp, struct lwp *l) 886 { 887 struct msdosfsmount *pmp; 888 889 pmp = VFSTOMSDOSFS(mp); 890 sbp->f_bsize = pmp->pm_bpcluster; 891 sbp->f_frsize = sbp->f_bsize; 892 sbp->f_iosize = pmp->pm_bpcluster; 893 sbp->f_blocks = pmp->pm_nmbrofclusters; 894 sbp->f_bfree = pmp->pm_freeclustercount; 895 sbp->f_bavail = pmp->pm_freeclustercount; 896 sbp->f_bresvd = 0; 897 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 898 sbp->f_ffree = 0; /* what to put in here? */ 899 sbp->f_favail = 0; /* what to put in here? */ 900 sbp->f_fresvd = 0; 901 copy_statvfs_info(sbp, mp); 902 return (0); 903 } 904 905 int 906 msdosfs_sync(mp, waitfor, cred, l) 907 struct mount *mp; 908 int waitfor; 909 kauth_cred_t cred; 910 struct lwp *l; 911 { 912 struct vnode *vp, *nvp; 913 struct denode *dep; 914 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 915 int error, allerror = 0; 916 917 /* 918 * If we ever switch to not updating all of the fats all the time, 919 * this would be the place to update them from the first one. 920 */ 921 if (pmp->pm_fmod != 0) { 922 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 923 panic("msdosfs_sync: rofs mod"); 924 else { 925 /* update fats here */ 926 } 927 } 928 /* 929 * Write back each (modified) denode. 930 */ 931 simple_lock(&mntvnode_slock); 932 loop: 933 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = nvp) { 934 /* 935 * If the vnode that we are about to sync is no longer 936 * assoicated with this mount point, start over. 937 */ 938 if (vp->v_mount != mp) 939 goto loop; 940 simple_lock(&vp->v_interlock); 941 nvp = TAILQ_NEXT(vp, v_mntvnodes); 942 dep = VTODE(vp); 943 if (waitfor == MNT_LAZY || vp->v_type == VNON || 944 (((dep->de_flag & 945 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 946 (LIST_EMPTY(&vp->v_dirtyblkhd) && 947 vp->v_uobj.uo_npages == 0))) { 948 simple_unlock(&vp->v_interlock); 949 continue; 950 } 951 simple_unlock(&mntvnode_slock); 952 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 953 if (error) { 954 simple_lock(&mntvnode_slock); 955 if (error == ENOENT) 956 goto loop; 957 continue; 958 } 959 if ((error = VOP_FSYNC(vp, cred, 960 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l)) != 0) 961 allerror = error; 962 vput(vp); 963 simple_lock(&mntvnode_slock); 964 } 965 simple_unlock(&mntvnode_slock); 966 /* 967 * Force stale file system control information to be flushed. 968 */ 969 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 970 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l)) != 0) 971 allerror = error; 972 #ifdef QUOTA 973 /* qsync(mp); */ 974 #endif 975 return (allerror); 976 } 977 978 int 979 msdosfs_fhtovp(mp, fhp, vpp) 980 struct mount *mp; 981 struct fid *fhp; 982 struct vnode **vpp; 983 { 984 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 985 struct defid defh; 986 struct denode *dep; 987 int error; 988 989 if (fhp->fid_len != sizeof(struct defid)) 990 return EINVAL; 991 992 memcpy(&defh, fhp, sizeof(defh)); 993 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 994 if (error) { 995 *vpp = NULLVP; 996 return (error); 997 } 998 *vpp = DETOV(dep); 999 return (0); 1000 } 1001 1002 int 1003 msdosfs_vptofh(vp, fhp, fh_size) 1004 struct vnode *vp; 1005 struct fid *fhp; 1006 size_t *fh_size; 1007 { 1008 struct denode *dep; 1009 struct defid defh; 1010 1011 if (*fh_size < sizeof(struct defid)) { 1012 *fh_size = sizeof(struct defid); 1013 return E2BIG; 1014 } 1015 *fh_size = sizeof(struct defid); 1016 dep = VTODE(vp); 1017 memset(&defh, 0, sizeof(defh)); 1018 defh.defid_len = sizeof(struct defid); 1019 defh.defid_dirclust = dep->de_dirclust; 1020 defh.defid_dirofs = dep->de_diroffset; 1021 /* defh.defid_gen = dep->de_gen; */ 1022 memcpy(fhp, &defh, sizeof(defh)); 1023 return (0); 1024 } 1025 1026 int 1027 msdosfs_vget(struct mount *mp, ino_t ino, 1028 struct vnode **vpp) 1029 { 1030 1031 return (EOPNOTSUPP); 1032 } 1033 1034 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1035 { 1036 1037 sysctl_createv(clog, 0, NULL, NULL, 1038 CTLFLAG_PERMANENT, 1039 CTLTYPE_NODE, "vfs", NULL, 1040 NULL, 0, NULL, 0, 1041 CTL_VFS, CTL_EOL); 1042 sysctl_createv(clog, 0, NULL, NULL, 1043 CTLFLAG_PERMANENT, 1044 CTLTYPE_NODE, "msdosfs", 1045 SYSCTL_DESCR("MS-DOS file system"), 1046 NULL, 0, NULL, 0, 1047 CTL_VFS, 4, CTL_EOL); 1048 /* 1049 * XXX the "4" above could be dynamic, thereby eliminating one 1050 * more instance of the "number to vfs" mapping problem, but 1051 * "4" is the order as taken from sys/mount.h 1052 */ 1053 }
Cache object: 1299ad3bd533a8e5e43a61a5adc8d36a
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