msdosfs_vfsops.c revision 143570
1/* $FreeBSD: head/sys/fs/msdosfs/msdosfs_vfsops.c 143570 2005-03-14 12:24:35Z phk $ */ 2/* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws 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/conf.h> 54#include <sys/namei.h> 55#include <sys/proc.h> 56#include <sys/kernel.h> 57#include <sys/vnode.h> 58#include <sys/mount.h> 59#include <sys/bio.h> 60#include <sys/buf.h> 61#include <sys/fcntl.h> 62#include <sys/malloc.h> 63#include <sys/stat.h> /* defines ALLPERMS */ 64#include <sys/iconv.h> 65#include <sys/mutex.h> 66 67#include <fs/msdosfs/bpb.h> 68#include <fs/msdosfs/bootsect.h> 69#include <fs/msdosfs/msdosfsmount.h> 70#include <fs/msdosfs/direntry.h> 71#include <fs/msdosfs/denode.h> 72#include <fs/msdosfs/fat.h> 73 74#include <geom/geom.h> 75#include <geom/geom_vfs.h> 76 77#include "opt_msdosfs.h" 78 79/* List of mount options we support */ 80static const char *msdosfs_opts[] = { 81 "from", 82 "export", 83 "uid", "gid", "mask", "dirmask", 84 "shortname", "longname", "win95", 85 "kiconv", "cs_win", "cs_dos", "cs_local", 86 NULL 87}; 88 89#define MSDOSFS_DFLTBSIZE 4096 90 91#if 1 /*def PC98*/ 92/* 93 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 94 * garbage or a random value :-{ 95 * If you want to use that broken-signatured media, define the 96 * following symbol even though PC/AT. 97 * (ex. mount PC-98 DOS formatted FD on PC/AT) 98 */ 99#define MSDOSFS_NOCHECKSIG 100#endif 101 102MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 103static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 104 105struct iconv_functions *msdosfs_iconv = NULL; 106 107static int update_mp(struct mount *mp, struct thread *td); 108static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 109 struct thread *td); 110static vfs_fhtovp_t msdosfs_fhtovp; 111static vfs_mount_t msdosfs_mount; 112static vfs_root_t msdosfs_root; 113static vfs_statfs_t msdosfs_statfs; 114static vfs_sync_t msdosfs_sync; 115static vfs_unmount_t msdosfs_unmount; 116static vfs_vptofh_t msdosfs_vptofh; 117 118/* Maximum length of a character set name (arbitrary). */ 119#define MAXCSLEN 64 120 121static int 122update_mp(mp, td) 123 struct mount *mp; 124 struct thread *td; 125{ 126 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 127 void *dos, *win, *local; 128 int error, v; 129 130 if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) { 131 if (msdosfs_iconv != NULL) { 132 error = vfs_getopt(mp->mnt_optnew, 133 "cs_win", &win, NULL); 134 if (!error) 135 error = vfs_getopt(mp->mnt_optnew, 136 "cs_local", &local, NULL); 137 if (!error) 138 error = vfs_getopt(mp->mnt_optnew, 139 "cs_dos", &dos, NULL); 140 if (!error) { 141 msdosfs_iconv->open(win, local, &pmp->pm_u2w); 142 msdosfs_iconv->open(local, win, &pmp->pm_w2u); 143 msdosfs_iconv->open(dos, local, &pmp->pm_u2d); 144 msdosfs_iconv->open(local, dos, &pmp->pm_d2u); 145 } 146 if (error != 0) 147 return (error); 148 } else { 149 pmp->pm_w2u = NULL; 150 pmp->pm_u2w = NULL; 151 pmp->pm_d2u = NULL; 152 pmp->pm_u2d = NULL; 153 } 154 } 155 156 if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v)) 157 pmp->pm_gid = v; 158 if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v)) 159 pmp->pm_uid = v; 160 if (1 == vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v)) 161 pmp->pm_mask = v & ALLPERMS; 162 if (1 == vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v)) 163 pmp->pm_dirmask = v & ALLPERMS; 164 vfs_flagopt(mp->mnt_optnew, "shortname", 165 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 166 vfs_flagopt(mp->mnt_optnew, "longname", 167 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 168 vfs_flagopt(mp->mnt_optnew, "kiconv", 169 &pmp->pm_flags, MSDOSFSMNT_KICONV); 170 171 /* XXX: Can't use flagopt due to negative option */ 172 if (!vfs_getopt(mp->mnt_optnew, "win95", NULL, NULL)) 173 pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95; 174 else 175 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 176 177 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 178 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 179 else if (!(pmp->pm_flags & 180 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 181 struct vnode *rootvp; 182 183 /* 184 * Try to divine whether to support Win'95 long filenames 185 */ 186 if (FAT32(pmp)) 187 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 188 else { 189 if ((error = msdosfs_root(mp, &rootvp, td)) != 0) 190 return error; 191 pmp->pm_flags |= findwin95(VTODE(rootvp)) 192 ? MSDOSFSMNT_LONGNAME 193 : MSDOSFSMNT_SHORTNAME; 194 vput(rootvp); 195 } 196 } 197 return 0; 198} 199 200static int 201msdosfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td) 202{ 203 struct msdosfs_args args; 204 int error; 205 206 if (data == NULL) 207 return (EINVAL); 208 error = copyin(data, &args, sizeof args); 209 if (error) 210 return (error); 211 212 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 213 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 214 ma = mount_argf(ma, "uid", "%d", args.uid); 215 ma = mount_argf(ma, "gid", "%d", args.gid); 216 ma = mount_argf(ma, "mask", "%d", args.mask); 217 ma = mount_argf(ma, "dirmask", "%d", args.dirmask); 218 219 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname"); 220 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname"); 221 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95"); 222 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv"); 223 224 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN); 225 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN); 226 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN); 227 228 error = kernel_mount(ma, flags); 229 230 return (error); 231} 232 233/* 234 * mp - path - addr in user space of mount point (ie /usr or whatever) 235 * data - addr in user space of mount params including the name of the block 236 * special file to treat as a filesystem. 237 */ 238static int 239msdosfs_mount(struct mount *mp, struct thread *td) 240{ 241 struct vnode *devvp; /* vnode for blk device to mount */ 242 struct export_args export; 243 /* msdosfs specific mount control block */ 244 struct msdosfsmount *pmp = NULL; 245 struct nameidata ndp; 246 int error, flags; 247 mode_t accessmode; 248 char *from; 249 250 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts)) 251 return (EINVAL); 252 253 /* 254 * If updating, check whether changing from read-only to 255 * read/write; if there is no device name, that's all we do. 256 */ 257 if (mp->mnt_flag & MNT_UPDATE) { 258 pmp = VFSTOMSDOSFS(mp); 259 260 error = vfs_copyopt(mp->mnt_optnew, "export", 261 &export, sizeof export); 262 if (error == 0 && export.ex_flags != 0) { 263 /* 264 * Process export requests. 265 */ 266 if ((export.ex_flags & MNT_EXPORTED) != 0 && 267 (pmp->pm_flags & MSDOSFS_LARGEFS) != 0) 268 return (EOPNOTSUPP); 269 return (vfs_export(mp, &export)); 270 } 271 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 272 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 273 error = VFS_SYNC(mp, MNT_WAIT, td); 274 if (error) 275 return (error); 276 flags = WRITECLOSE; 277 if (mp->mnt_flag & MNT_FORCE) 278 flags |= FORCECLOSE; 279 error = vflush(mp, 0, flags, td); 280 if (error) 281 return (error); 282 DROP_GIANT(); 283 g_topology_lock(); 284 g_access(pmp->pm_cp, 0, -1, 0); 285 g_topology_unlock(); 286 PICKUP_GIANT(); 287 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 288 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 289 /* 290 * If upgrade to read-write by non-root, then verify 291 * that user has necessary permissions on the device. 292 */ 293 if (suser(td)) { 294 devvp = pmp->pm_devvp; 295 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 296 error = VOP_ACCESS(devvp, VREAD | VWRITE, 297 td->td_ucred, td); 298 if (error) { 299 VOP_UNLOCK(devvp, 0, td); 300 return (error); 301 } 302 VOP_UNLOCK(devvp, 0, td); 303 } 304 DROP_GIANT(); 305 g_topology_lock(); 306 error = g_access(pmp->pm_cp, 0, 1, 0); 307 g_topology_unlock(); 308 PICKUP_GIANT(); 309 if (error) 310 return (error); 311 312 /* Now that the volume is modifiable, mark it dirty. */ 313 error = markvoldirty(pmp, 1); 314 if (error) 315 return (error); 316 } 317 vfs_flagopt(mp->mnt_optnew, "ro", 318 &pmp->pm_flags, MSDOSFSMNT_RONLY); 319 vfs_flagopt(mp->mnt_optnew, "ro", 320 &mp->mnt_flag, MNT_RDONLY); 321 if (vfs_getopt(mp->mnt_optnew, "from", NULL, NULL)) { 322#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 323 if (args.flags & MSDOSFSMNT_MNTOPT) { 324 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 325 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 326 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 327 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 328 } 329#endif 330 } 331 } 332 /* 333 * Not an update, or updating the name: look up the name 334 * and verify that it refers to a sensible disk device. 335 */ 336 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 337 return (EINVAL); 338 NDINIT(&ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, from, td); 339 error = namei(&ndp); 340 if (error) 341 return (error); 342 devvp = ndp.ni_vp; 343 NDFREE(&ndp, NDF_ONLY_PNBUF); 344 345 if (!vn_isdisk(devvp, &error)) { 346 vrele(devvp); 347 return (error); 348 } 349 /* 350 * If mount by non-root, then verify that user has necessary 351 * permissions on the device. 352 */ 353 if (suser(td)) { 354 accessmode = VREAD; 355 if ((mp->mnt_flag & MNT_RDONLY) == 0) 356 accessmode |= VWRITE; 357 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 358 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 359 if (error) { 360 vput(devvp); 361 return (error); 362 } 363 VOP_UNLOCK(devvp, 0, td); 364 } 365 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 366 error = mountmsdosfs(devvp, mp, td); 367#ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 368 pmp = VFSTOMSDOSFS(mp); 369#endif 370 } else { 371 if (devvp != pmp->pm_devvp) 372 error = EINVAL; /* XXX needs translation */ 373 else 374 vrele(devvp); 375 } 376 if (error) { 377 vrele(devvp); 378 return (error); 379 } 380 381 error = update_mp(mp, td); 382 if (error) { 383 if ((mp->mnt_flag & MNT_UPDATE) == 0) 384 msdosfs_unmount(mp, MNT_FORCE, td); 385 return error; 386 } 387 388 vfs_mountedfrom(mp, from); 389#ifdef MSDOSFS_DEBUG 390 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 391#endif 392 return (0); 393} 394 395static int 396mountmsdosfs(devvp, mp, td) 397 struct vnode *devvp; 398 struct mount *mp; 399 struct thread *td; 400{ 401 struct msdosfsmount *pmp; 402 struct buf *bp; 403 struct cdev *dev = devvp->v_rdev; 404 union bootsector *bsp; 405 struct byte_bpb33 *b33; 406 struct byte_bpb50 *b50; 407 struct byte_bpb710 *b710; 408 u_int8_t SecPerClust; 409 u_long clusters; 410 int ronly, error; 411 struct g_consumer *cp; 412 struct bufobj *bo; 413 414 ronly = !vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL); 415 /* XXX: use VOP_ACCESS to check FS perms */ 416 DROP_GIANT(); 417 g_topology_lock(); 418 error = g_vfs_open(devvp, &cp, "msdos", ronly ? 0 : 1); 419 g_topology_unlock(); 420 PICKUP_GIANT(); 421 VOP_UNLOCK(devvp, 0, td); 422 if (error) 423 return (error); 424 425 bo = &devvp->v_bufobj; 426 bp = NULL; /* both used in error_exit */ 427 pmp = NULL; 428 429 /* 430 * Read the boot sector of the filesystem, and then check the 431 * boot signature. If not a dos boot sector then error out. 432 * 433 * NOTE: 2048 is a maximum sector size in current... 434 */ 435 error = bread(devvp, 0, 2048, NOCRED, &bp); 436 if (error) 437 goto error_exit; 438 bp->b_flags |= B_AGE; 439 bsp = (union bootsector *)bp->b_data; 440 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 441 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 442 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 443 444#ifndef MSDOSFS_NOCHECKSIG 445 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 446 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 447 error = EINVAL; 448 goto error_exit; 449 } 450#endif 451 452 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 453 pmp->pm_mountp = mp; 454 pmp->pm_cp = cp; 455 pmp->pm_bo = bo; 456 457 /* 458 * Compute several useful quantities from the bpb in the 459 * bootsector. Copy in the dos 5 variant of the bpb then fix up 460 * the fields that are different between dos 5 and dos 3.3. 461 */ 462 SecPerClust = b50->bpbSecPerClust; 463 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 464 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 465 error = EINVAL; 466 goto error_exit; 467 } 468 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 469 pmp->pm_FATs = b50->bpbFATs; 470 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 471 pmp->pm_Sectors = getushort(b50->bpbSectors); 472 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 473 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 474 pmp->pm_Heads = getushort(b50->bpbHeads); 475 pmp->pm_Media = b50->bpbMedia; 476 477 /* calculate the ratio of sector size to DEV_BSIZE */ 478 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 479 480 /* XXX - We should probably check more values here */ 481 if (!pmp->pm_BytesPerSec || !SecPerClust 482 || !pmp->pm_Heads 483#ifdef PC98 484 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 485#else 486 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 487#endif 488 error = EINVAL; 489 goto error_exit; 490 } 491 492 if (pmp->pm_Sectors == 0) { 493 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 494 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 495 } else { 496 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 497 pmp->pm_HugeSectors = pmp->pm_Sectors; 498 } 499#ifndef MSDOSFS_LARGE 500 if (pmp->pm_HugeSectors > 0xffffffff / 501 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 502 /* 503 * We cannot deal currently with this size of disk 504 * due to fileid limitations (see msdosfs_getattr and 505 * msdosfs_readdir) 506 */ 507 error = EINVAL; 508 printf("mountmsdosfs(): disk too big, sorry\n"); 509 goto error_exit; 510 } 511#endif /* !MSDOSFS_LARGE */ 512 513 if (pmp->pm_RootDirEnts == 0) { 514 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 515 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 516 || pmp->pm_Sectors 517 || pmp->pm_FATsecs 518 || getushort(b710->bpbFSVers)) { 519 error = EINVAL; 520 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 521 goto error_exit; 522 } 523 pmp->pm_fatmask = FAT32_MASK; 524 pmp->pm_fatmult = 4; 525 pmp->pm_fatdiv = 1; 526 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 527 if (getushort(b710->bpbExtFlags) & FATMIRROR) 528 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 529 else 530 pmp->pm_flags |= MSDOSFS_FATMIRROR; 531 } else 532 pmp->pm_flags |= MSDOSFS_FATMIRROR; 533 534 /* 535 * Check a few values (could do some more): 536 * - logical sector size: power of 2, >= block size 537 * - sectors per cluster: power of 2, >= 1 538 * - number of sectors: >= 1, <= size of partition 539 * - number of FAT sectors: >= 1 540 */ 541 if ( (SecPerClust == 0) 542 || (SecPerClust & (SecPerClust - 1)) 543 || (pmp->pm_BytesPerSec < DEV_BSIZE) 544 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 545 || (pmp->pm_HugeSectors == 0) 546 || (pmp->pm_FATsecs == 0) 547 ) { 548 error = EINVAL; 549 goto error_exit; 550 } 551 552 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 553 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 554 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 555 SecPerClust *= pmp->pm_BlkPerSec; 556 557 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 558 559 if (FAT32(pmp)) { 560 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 561 pmp->pm_firstcluster = pmp->pm_fatblk 562 + (pmp->pm_FATs * pmp->pm_FATsecs); 563 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 564 } else { 565 pmp->pm_rootdirblk = pmp->pm_fatblk + 566 (pmp->pm_FATs * pmp->pm_FATsecs); 567 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 568 + DEV_BSIZE - 1) 569 / DEV_BSIZE; /* in blocks */ 570 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 571 } 572 573 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 574 SecPerClust + 1; 575 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 576 577 if (pmp->pm_fatmask == 0) { 578 if (pmp->pm_maxcluster 579 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 580 /* 581 * This will usually be a floppy disk. This size makes 582 * sure that one fat entry will not be split across 583 * multiple blocks. 584 */ 585 pmp->pm_fatmask = FAT12_MASK; 586 pmp->pm_fatmult = 3; 587 pmp->pm_fatdiv = 2; 588 } else { 589 pmp->pm_fatmask = FAT16_MASK; 590 pmp->pm_fatmult = 2; 591 pmp->pm_fatdiv = 1; 592 } 593 } 594 595 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 596 if (pmp->pm_maxcluster >= clusters) { 597 printf("Warning: number of clusters (%ld) exceeds FAT " 598 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 599 pmp->pm_maxcluster = clusters - 1; 600 } 601 602 603 if (FAT12(pmp)) 604 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 605 else 606 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 607 608 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 609 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 610 611 /* 612 * Compute mask and shift value for isolating cluster relative byte 613 * offsets and cluster numbers from a file offset. 614 */ 615 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 616 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 617 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 618 619 /* 620 * Check for valid cluster size 621 * must be a power of 2 622 */ 623 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 624 error = EINVAL; 625 goto error_exit; 626 } 627 628 /* 629 * Release the bootsector buffer. 630 */ 631 brelse(bp); 632 bp = NULL; 633 634 /* 635 * Check FSInfo. 636 */ 637 if (pmp->pm_fsinfo) { 638 struct fsinfo *fp; 639 640 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 641 NOCRED, &bp)) != 0) 642 goto error_exit; 643 fp = (struct fsinfo *)bp->b_data; 644 if (!bcmp(fp->fsisig1, "RRaA", 4) 645 && !bcmp(fp->fsisig2, "rrAa", 4) 646 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 647 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 648 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 649 if (pmp->pm_nxtfree == 0xffffffff) 650 pmp->pm_nxtfree = CLUST_FIRST; 651 } else 652 pmp->pm_fsinfo = 0; 653 brelse(bp); 654 bp = NULL; 655 } 656 657 /* 658 * Check and validate (or perhaps invalidate?) the fsinfo structure? 659 */ 660 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 661 printf( 662 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 663 pmp->pm_nxtfree, pmp->pm_maxcluster); 664 error = EINVAL; 665 goto error_exit; 666 } 667 668 /* 669 * Allocate memory for the bitmap of allocated clusters, and then 670 * fill it in. 671 */ 672 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 673 * sizeof(*pmp->pm_inusemap), 674 M_MSDOSFSFAT, M_WAITOK); 675 676 /* 677 * fillinusemap() needs pm_devvp. 678 */ 679 pmp->pm_dev = dev; 680 pmp->pm_devvp = devvp; 681 682 /* 683 * Have the inuse map filled in. 684 */ 685 if ((error = fillinusemap(pmp)) != 0) 686 goto error_exit; 687 688 /* 689 * If they want fat updates to be synchronous then let them suffer 690 * the performance degradation in exchange for the on disk copy of 691 * the fat being correct just about all the time. I suppose this 692 * would be a good thing to turn on if the kernel is still flakey. 693 */ 694 if (mp->mnt_flag & MNT_SYNCHRONOUS) 695 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 696 697 /* 698 * Finish up. 699 */ 700 if (ronly) 701 pmp->pm_flags |= MSDOSFSMNT_RONLY; 702 else { 703 /* Mark the volume dirty while it is mounted read/write. */ 704 if ((error = markvoldirty(pmp, 1)) != 0) 705 goto error_exit; 706 pmp->pm_fmod = 1; 707 } 708 mp->mnt_data = (qaddr_t) pmp; 709 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 710 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 711 mp->mnt_flag |= MNT_LOCAL; 712 713#ifdef MSDOSFS_LARGE 714 msdosfs_fileno_init(mp); 715#endif 716 717 return 0; 718 719error_exit: 720 if (bp) 721 brelse(bp); 722 if (cp != NULL) { 723 DROP_GIANT(); 724 g_topology_lock(); 725 g_vfs_close(cp, td); 726 g_topology_unlock(); 727 PICKUP_GIANT(); 728 } 729 if (pmp) { 730 if (pmp->pm_inusemap) 731 free(pmp->pm_inusemap, M_MSDOSFSFAT); 732 free(pmp, M_MSDOSFSMNT); 733 mp->mnt_data = (qaddr_t)0; 734 } 735 return (error); 736} 737 738/* 739 * Unmount the filesystem described by mp. 740 */ 741static int 742msdosfs_unmount(mp, mntflags, td) 743 struct mount *mp; 744 int mntflags; 745 struct thread *td; 746{ 747 struct msdosfsmount *pmp; 748 int error, flags; 749 750 flags = 0; 751 if (mntflags & MNT_FORCE) 752 flags |= FORCECLOSE; 753 error = vflush(mp, 0, flags, td); 754 if (error) 755 return error; 756 pmp = VFSTOMSDOSFS(mp); 757 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 758 if (pmp->pm_w2u) 759 msdosfs_iconv->close(pmp->pm_w2u); 760 if (pmp->pm_u2w) 761 msdosfs_iconv->close(pmp->pm_u2w); 762 if (pmp->pm_d2u) 763 msdosfs_iconv->close(pmp->pm_d2u); 764 if (pmp->pm_u2d) 765 msdosfs_iconv->close(pmp->pm_u2d); 766 } 767 768 /* If the volume was mounted read/write, mark it clean now. */ 769 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 770 error = markvoldirty(pmp, 0); 771 if (error && (flags & FORCECLOSE) == 0) 772 return (error); 773 } 774#ifdef MSDOSFS_DEBUG 775 { 776 struct vnode *vp = pmp->pm_devvp; 777 778 VI_LOCK(vp); 779 vn_printf(vp, 780 "msdosfs_umount(): just before calling VOP_CLOSE()\n"); 781 printf("freef %p, freeb %p, mount %p\n", 782 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 783 vp->v_mount); 784 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 785 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd), 786 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd), 787 vp->v_bufobj.bo_numoutput, vp->v_type); 788 VI_UNLOCK(vp); 789 } 790#endif 791 DROP_GIANT(); 792 g_topology_lock(); 793 g_vfs_close(pmp->pm_cp, td); 794 g_topology_unlock(); 795 PICKUP_GIANT(); 796 vrele(pmp->pm_devvp); 797 free(pmp->pm_inusemap, M_MSDOSFSFAT); 798#ifdef MSDOSFS_LARGE 799 msdosfs_fileno_free(mp); 800#endif 801 free(pmp, M_MSDOSFSMNT); 802 mp->mnt_data = (qaddr_t)0; 803 mp->mnt_flag &= ~MNT_LOCAL; 804 return (error); 805} 806 807static int 808msdosfs_root(mp, vpp, td) 809 struct mount *mp; 810 struct vnode **vpp; 811 struct thread *td; 812{ 813 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 814 struct denode *ndep; 815 int error; 816 817#ifdef MSDOSFS_DEBUG 818 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 819#endif 820 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 821 if (error) 822 return (error); 823 *vpp = DETOV(ndep); 824 return (0); 825} 826 827static int 828msdosfs_statfs(mp, sbp, td) 829 struct mount *mp; 830 struct statfs *sbp; 831 struct thread *td; 832{ 833 struct msdosfsmount *pmp; 834 835 pmp = VFSTOMSDOSFS(mp); 836 sbp->f_bsize = pmp->pm_bpcluster; 837 sbp->f_iosize = pmp->pm_bpcluster; 838 sbp->f_blocks = pmp->pm_maxcluster + 1; 839 sbp->f_bfree = pmp->pm_freeclustercount; 840 sbp->f_bavail = pmp->pm_freeclustercount; 841 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 842 sbp->f_ffree = 0; /* what to put in here? */ 843 return (0); 844} 845 846static int 847msdosfs_sync(mp, waitfor, td) 848 struct mount *mp; 849 int waitfor; 850 struct thread *td; 851{ 852 struct vnode *vp, *nvp; 853 struct denode *dep; 854 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 855 int error, allerror = 0; 856 857 /* 858 * If we ever switch to not updating all of the fats all the time, 859 * this would be the place to update them from the first one. 860 */ 861 if (pmp->pm_fmod != 0) { 862 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 863 panic("msdosfs_sync: rofs mod"); 864 else { 865 /* update fats here */ 866 } 867 } 868 /* 869 * Write back each (modified) denode. 870 */ 871 MNT_ILOCK(mp); 872loop: 873 MNT_VNODE_FOREACH(vp, mp, nvp) { 874 VI_LOCK(vp); 875 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) { 876 VI_UNLOCK(vp); 877 continue; 878 } 879 MNT_IUNLOCK(mp); 880 dep = VTODE(vp); 881 if ((dep->de_flag & 882 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 883 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 884 waitfor == MNT_LAZY)) { 885 VI_UNLOCK(vp); 886 MNT_ILOCK(mp); 887 continue; 888 } 889 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 890 if (error) { 891 MNT_ILOCK(mp); 892 if (error == ENOENT) 893 goto loop; 894 continue; 895 } 896 error = VOP_FSYNC(vp, waitfor, td); 897 if (error) 898 allerror = error; 899 VOP_UNLOCK(vp, 0, td); 900 vrele(vp); 901 MNT_ILOCK(mp); 902 } 903 MNT_IUNLOCK(mp); 904 905 /* 906 * Flush filesystem control info. 907 */ 908 if (waitfor != MNT_LAZY) { 909 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 910 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 911 if (error) 912 allerror = error; 913 VOP_UNLOCK(pmp->pm_devvp, 0, td); 914 } 915 return (allerror); 916} 917 918static int 919msdosfs_fhtovp(mp, fhp, vpp) 920 struct mount *mp; 921 struct fid *fhp; 922 struct vnode **vpp; 923{ 924 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 925 struct defid *defhp = (struct defid *) fhp; 926 struct denode *dep; 927 int error; 928 929 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 930 if (error) { 931 *vpp = NULLVP; 932 return (error); 933 } 934 *vpp = DETOV(dep); 935 vnode_create_vobject(*vpp, dep->de_FileSize, curthread); 936 return (0); 937} 938 939static int 940msdosfs_vptofh(vp, fhp) 941 struct vnode *vp; 942 struct fid *fhp; 943{ 944 struct denode *dep; 945 struct defid *defhp; 946 947 dep = VTODE(vp); 948 defhp = (struct defid *)fhp; 949 defhp->defid_len = sizeof(struct defid); 950 defhp->defid_dirclust = dep->de_dirclust; 951 defhp->defid_dirofs = dep->de_diroffset; 952 /* defhp->defid_gen = dep->de_gen; */ 953 return (0); 954} 955 956static struct vfsops msdosfs_vfsops = { 957 .vfs_fhtovp = msdosfs_fhtovp, 958 .vfs_mount = msdosfs_mount, 959 .vfs_cmount = msdosfs_cmount, 960 .vfs_root = msdosfs_root, 961 .vfs_statfs = msdosfs_statfs, 962 .vfs_sync = msdosfs_sync, 963 .vfs_unmount = msdosfs_unmount, 964 .vfs_vptofh = msdosfs_vptofh, 965}; 966 967VFS_SET(msdosfs_vfsops, msdosfs, 0); 968MODULE_VERSION(msdosfs, 1); 969