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sys/fs/msdosfs/msdosfs_vfsops.c
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1 /* $FreeBSD: releng/6.0/sys/fs/msdosfs/msdosfs_vfsops.c 150909 2005-10-04 13:13:57Z peadar $ */ 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 */ 80 static 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 101 102 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 103 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 104 105 struct iconv_functions *msdosfs_iconv = NULL; 106 107 static int update_mp(struct mount *mp, struct thread *td); 108 static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 109 struct thread *td); 110 static vfs_fhtovp_t msdosfs_fhtovp; 111 static vfs_mount_t msdosfs_mount; 112 static vfs_root_t msdosfs_root; 113 static vfs_statfs_t msdosfs_statfs; 114 static vfs_sync_t msdosfs_sync; 115 static vfs_unmount_t msdosfs_unmount; 116 static vfs_vptofh_t msdosfs_vptofh; 117 118 /* Maximum length of a character set name (arbitrary). */ 119 #define MAXCSLEN 64 120 121 static int 122 update_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 = 190 msdosfs_root(mp, LK_EXCLUSIVE, &rootvp, td)) != 0) 191 return error; 192 pmp->pm_flags |= findwin95(VTODE(rootvp)) 193 ? MSDOSFSMNT_LONGNAME 194 : MSDOSFSMNT_SHORTNAME; 195 vput(rootvp); 196 } 197 } 198 return 0; 199 } 200 201 static int 202 msdosfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td) 203 { 204 struct msdosfs_args args; 205 int error; 206 207 if (data == NULL) 208 return (EINVAL); 209 error = copyin(data, &args, sizeof args); 210 if (error) 211 return (error); 212 213 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 214 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 215 ma = mount_argf(ma, "uid", "%d", args.uid); 216 ma = mount_argf(ma, "gid", "%d", args.gid); 217 ma = mount_argf(ma, "mask", "%d", args.mask); 218 ma = mount_argf(ma, "dirmask", "%d", args.dirmask); 219 220 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname"); 221 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname"); 222 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95"); 223 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv"); 224 225 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN); 226 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN); 227 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN); 228 229 error = kernel_mount(ma, flags); 230 231 return (error); 232 } 233 234 /* 235 * mp - path - addr in user space of mount point (ie /usr or whatever) 236 * data - addr in user space of mount params including the name of the block 237 * special file to treat as a filesystem. 238 */ 239 static int 240 msdosfs_mount(struct mount *mp, struct thread *td) 241 { 242 struct vnode *devvp; /* vnode for blk device to mount */ 243 struct export_args export; 244 /* msdosfs specific mount control block */ 245 struct msdosfsmount *pmp = NULL; 246 struct nameidata ndp; 247 int error, flags; 248 mode_t accessmode; 249 char *from; 250 251 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts)) 252 return (EINVAL); 253 254 /* 255 * If updating, check whether changing from read-only to 256 * read/write; if there is no device name, that's all we do. 257 */ 258 if (mp->mnt_flag & MNT_UPDATE) { 259 pmp = VFSTOMSDOSFS(mp); 260 261 error = vfs_copyopt(mp->mnt_optnew, "export", 262 &export, sizeof export); 263 if (error == 0 && export.ex_flags != 0) { 264 /* 265 * Process export requests. 266 */ 267 if ((export.ex_flags & MNT_EXPORTED) != 0 && 268 (pmp->pm_flags & MSDOSFS_LARGEFS) != 0) 269 return (EOPNOTSUPP); 270 return (vfs_export(mp, &export)); 271 } 272 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 273 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 274 error = VFS_SYNC(mp, MNT_WAIT, td); 275 if (error) 276 return (error); 277 flags = WRITECLOSE; 278 if (mp->mnt_flag & MNT_FORCE) 279 flags |= FORCECLOSE; 280 error = vflush(mp, 0, flags, td); 281 if (error) 282 return (error); 283 DROP_GIANT(); 284 g_topology_lock(); 285 g_access(pmp->pm_cp, 0, -1, 0); 286 g_topology_unlock(); 287 PICKUP_GIANT(); 288 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 289 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 290 /* 291 * If upgrade to read-write by non-root, then verify 292 * that user has necessary permissions on the device. 293 */ 294 if (suser(td)) { 295 devvp = pmp->pm_devvp; 296 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 297 error = VOP_ACCESS(devvp, VREAD | VWRITE, 298 td->td_ucred, td); 299 if (error) { 300 VOP_UNLOCK(devvp, 0, td); 301 return (error); 302 } 303 VOP_UNLOCK(devvp, 0, td); 304 } 305 DROP_GIANT(); 306 g_topology_lock(); 307 error = g_access(pmp->pm_cp, 0, 1, 0); 308 g_topology_unlock(); 309 PICKUP_GIANT(); 310 if (error) 311 return (error); 312 313 /* Now that the volume is modifiable, mark it dirty. */ 314 error = markvoldirty(pmp, 1); 315 if (error) 316 return (error); 317 } 318 vfs_flagopt(mp->mnt_optnew, "ro", 319 &pmp->pm_flags, MSDOSFSMNT_RONLY); 320 vfs_flagopt(mp->mnt_optnew, "ro", 321 &mp->mnt_flag, MNT_RDONLY); 322 if (vfs_getopt(mp->mnt_optnew, "from", NULL, NULL)) { 323 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 324 if (args.flags & MSDOSFSMNT_MNTOPT) { 325 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 326 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 327 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 328 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 329 } 330 #endif 331 } 332 } 333 /* 334 * Not an update, or updating the name: look up the name 335 * and verify that it refers to a sensible disk device. 336 */ 337 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 338 return (EINVAL); 339 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td); 340 error = namei(&ndp); 341 if (error) 342 return (error); 343 devvp = ndp.ni_vp; 344 NDFREE(&ndp, NDF_ONLY_PNBUF); 345 346 if (!vn_isdisk(devvp, &error)) { 347 vput(devvp); 348 return (error); 349 } 350 /* 351 * If mount by non-root, then verify that user has necessary 352 * permissions on the device. 353 */ 354 if (suser(td)) { 355 accessmode = VREAD; 356 if ((mp->mnt_flag & MNT_RDONLY) == 0) 357 accessmode |= VWRITE; 358 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 359 if (error) { 360 vput(devvp); 361 return (error); 362 } 363 } 364 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 365 error = mountmsdosfs(devvp, mp, td); 366 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 367 pmp = VFSTOMSDOSFS(mp); 368 #endif 369 } else { 370 if (devvp != pmp->pm_devvp) 371 error = EINVAL; /* XXX needs translation */ 372 else 373 vput(devvp); 374 } 375 if (error) { 376 vrele(devvp); 377 return (error); 378 } 379 380 error = update_mp(mp, td); 381 if (error) { 382 if ((mp->mnt_flag & MNT_UPDATE) == 0) 383 msdosfs_unmount(mp, MNT_FORCE, td); 384 return error; 385 } 386 387 vfs_mountedfrom(mp, from); 388 #ifdef MSDOSFS_DEBUG 389 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 390 #endif 391 return (0); 392 } 393 394 static int 395 mountmsdosfs(devvp, mp, td) 396 struct vnode *devvp; 397 struct mount *mp; 398 struct thread *td; 399 { 400 struct msdosfsmount *pmp; 401 struct buf *bp; 402 struct cdev *dev = devvp->v_rdev; 403 union bootsector *bsp; 404 struct byte_bpb33 *b33; 405 struct byte_bpb50 *b50; 406 struct byte_bpb710 *b710; 407 u_int8_t SecPerClust; 408 u_long clusters; 409 int ronly, error; 410 struct g_consumer *cp; 411 struct bufobj *bo; 412 413 ronly = !vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL); 414 /* XXX: use VOP_ACCESS to check FS perms */ 415 DROP_GIANT(); 416 g_topology_lock(); 417 error = g_vfs_open(devvp, &cp, "msdos", ronly ? 0 : 1); 418 g_topology_unlock(); 419 PICKUP_GIANT(); 420 VOP_UNLOCK(devvp, 0, td); 421 if (error) 422 return (error); 423 424 bo = &devvp->v_bufobj; 425 bp = NULL; /* both used in error_exit */ 426 pmp = NULL; 427 428 /* 429 * Read the boot sector of the filesystem, and then check the 430 * boot signature. If not a dos boot sector then error out. 431 * 432 * NOTE: 2048 is a maximum sector size in current... 433 */ 434 error = bread(devvp, 0, 2048, NOCRED, &bp); 435 if (error) 436 goto error_exit; 437 bp->b_flags |= B_AGE; 438 bsp = (union bootsector *)bp->b_data; 439 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 440 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 441 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 442 443 #ifndef MSDOSFS_NOCHECKSIG 444 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 445 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 446 error = EINVAL; 447 goto error_exit; 448 } 449 #endif 450 451 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 452 pmp->pm_mountp = mp; 453 pmp->pm_cp = cp; 454 pmp->pm_bo = bo; 455 456 /* 457 * Compute several useful quantities from the bpb in the 458 * bootsector. Copy in the dos 5 variant of the bpb then fix up 459 * the fields that are different between dos 5 and dos 3.3. 460 */ 461 SecPerClust = b50->bpbSecPerClust; 462 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 463 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 464 error = EINVAL; 465 goto error_exit; 466 } 467 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 468 pmp->pm_FATs = b50->bpbFATs; 469 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 470 pmp->pm_Sectors = getushort(b50->bpbSectors); 471 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 472 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 473 pmp->pm_Heads = getushort(b50->bpbHeads); 474 pmp->pm_Media = b50->bpbMedia; 475 476 /* calculate the ratio of sector size to DEV_BSIZE */ 477 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 478 479 /* XXX - We should probably check more values here */ 480 if (!pmp->pm_BytesPerSec || !SecPerClust 481 || !pmp->pm_Heads 482 #ifdef PC98 483 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 484 #else 485 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 486 #endif 487 error = EINVAL; 488 goto error_exit; 489 } 490 491 if (pmp->pm_Sectors == 0) { 492 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 493 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 494 } else { 495 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 496 pmp->pm_HugeSectors = pmp->pm_Sectors; 497 } 498 #ifndef MSDOSFS_LARGE 499 if (pmp->pm_HugeSectors > 0xffffffff / 500 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 501 /* 502 * We cannot deal currently with this size of disk 503 * due to fileid limitations (see msdosfs_getattr and 504 * msdosfs_readdir) 505 */ 506 error = EINVAL; 507 printf("mountmsdosfs(): disk too big, sorry\n"); 508 goto error_exit; 509 } 510 #endif /* !MSDOSFS_LARGE */ 511 512 if (pmp->pm_RootDirEnts == 0) { 513 if (pmp->pm_Sectors 514 || pmp->pm_FATsecs 515 || getushort(b710->bpbFSVers)) { 516 error = EINVAL; 517 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 518 goto error_exit; 519 } 520 pmp->pm_fatmask = FAT32_MASK; 521 pmp->pm_fatmult = 4; 522 pmp->pm_fatdiv = 1; 523 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 524 if (getushort(b710->bpbExtFlags) & FATMIRROR) 525 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 526 else 527 pmp->pm_flags |= MSDOSFS_FATMIRROR; 528 } else 529 pmp->pm_flags |= MSDOSFS_FATMIRROR; 530 531 /* 532 * Check a few values (could do some more): 533 * - logical sector size: power of 2, >= block size 534 * - sectors per cluster: power of 2, >= 1 535 * - number of sectors: >= 1, <= size of partition 536 * - number of FAT sectors: >= 1 537 */ 538 if ( (SecPerClust == 0) 539 || (SecPerClust & (SecPerClust - 1)) 540 || (pmp->pm_BytesPerSec < DEV_BSIZE) 541 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 542 || (pmp->pm_HugeSectors == 0) 543 || (pmp->pm_FATsecs == 0) 544 ) { 545 error = EINVAL; 546 goto error_exit; 547 } 548 549 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 550 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 551 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 552 SecPerClust *= pmp->pm_BlkPerSec; 553 554 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 555 556 if (FAT32(pmp)) { 557 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 558 pmp->pm_firstcluster = pmp->pm_fatblk 559 + (pmp->pm_FATs * pmp->pm_FATsecs); 560 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 561 } else { 562 pmp->pm_rootdirblk = pmp->pm_fatblk + 563 (pmp->pm_FATs * pmp->pm_FATsecs); 564 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 565 + DEV_BSIZE - 1) 566 / DEV_BSIZE; /* in blocks */ 567 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 568 } 569 570 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 571 SecPerClust + 1; 572 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 573 574 if (pmp->pm_fatmask == 0) { 575 if (pmp->pm_maxcluster 576 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 577 /* 578 * This will usually be a floppy disk. This size makes 579 * sure that one fat entry will not be split across 580 * multiple blocks. 581 */ 582 pmp->pm_fatmask = FAT12_MASK; 583 pmp->pm_fatmult = 3; 584 pmp->pm_fatdiv = 2; 585 } else { 586 pmp->pm_fatmask = FAT16_MASK; 587 pmp->pm_fatmult = 2; 588 pmp->pm_fatdiv = 1; 589 } 590 } 591 592 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 593 if (pmp->pm_maxcluster >= clusters) { 594 printf("Warning: number of clusters (%ld) exceeds FAT " 595 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 596 pmp->pm_maxcluster = clusters - 1; 597 } 598 599 600 if (FAT12(pmp)) 601 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 602 else 603 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 604 605 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 606 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 607 608 /* 609 * Compute mask and shift value for isolating cluster relative byte 610 * offsets and cluster numbers from a file offset. 611 */ 612 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 613 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 614 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 615 616 /* 617 * Check for valid cluster size 618 * must be a power of 2 619 */ 620 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 621 error = EINVAL; 622 goto error_exit; 623 } 624 625 /* 626 * Release the bootsector buffer. 627 */ 628 brelse(bp); 629 bp = NULL; 630 631 /* 632 * Check FSInfo. 633 */ 634 if (pmp->pm_fsinfo) { 635 struct fsinfo *fp; 636 637 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 638 NOCRED, &bp)) != 0) 639 goto error_exit; 640 fp = (struct fsinfo *)bp->b_data; 641 if (!bcmp(fp->fsisig1, "RRaA", 4) 642 && !bcmp(fp->fsisig2, "rrAa", 4) 643 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 644 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 645 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 646 if (pmp->pm_nxtfree == 0xffffffff) 647 pmp->pm_nxtfree = CLUST_FIRST; 648 } else 649 pmp->pm_fsinfo = 0; 650 brelse(bp); 651 bp = NULL; 652 } 653 654 /* 655 * Check and validate (or perhaps invalidate?) the fsinfo structure? 656 */ 657 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 658 printf( 659 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 660 pmp->pm_nxtfree, pmp->pm_maxcluster); 661 error = EINVAL; 662 goto error_exit; 663 } 664 665 /* 666 * Allocate memory for the bitmap of allocated clusters, and then 667 * fill it in. 668 */ 669 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 670 * sizeof(*pmp->pm_inusemap), 671 M_MSDOSFSFAT, M_WAITOK); 672 673 /* 674 * fillinusemap() needs pm_devvp. 675 */ 676 pmp->pm_devvp = devvp; 677 678 /* 679 * Have the inuse map filled in. 680 */ 681 if ((error = fillinusemap(pmp)) != 0) 682 goto error_exit; 683 684 /* 685 * If they want fat updates to be synchronous then let them suffer 686 * the performance degradation in exchange for the on disk copy of 687 * the fat being correct just about all the time. I suppose this 688 * would be a good thing to turn on if the kernel is still flakey. 689 */ 690 if (mp->mnt_flag & MNT_SYNCHRONOUS) 691 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 692 693 /* 694 * Finish up. 695 */ 696 if (ronly) 697 pmp->pm_flags |= MSDOSFSMNT_RONLY; 698 else { 699 /* Mark the volume dirty while it is mounted read/write. */ 700 if ((error = markvoldirty(pmp, 1)) != 0) 701 goto error_exit; 702 pmp->pm_fmod = 1; 703 } 704 mp->mnt_data = (qaddr_t) pmp; 705 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 706 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 707 mp->mnt_flag |= MNT_LOCAL; 708 709 #ifdef MSDOSFS_LARGE 710 msdosfs_fileno_init(mp); 711 #endif 712 713 return 0; 714 715 error_exit: 716 if (bp) 717 brelse(bp); 718 if (cp != NULL) { 719 DROP_GIANT(); 720 g_topology_lock(); 721 g_vfs_close(cp, td); 722 g_topology_unlock(); 723 PICKUP_GIANT(); 724 } 725 if (pmp) { 726 if (pmp->pm_inusemap) 727 free(pmp->pm_inusemap, M_MSDOSFSFAT); 728 free(pmp, M_MSDOSFSMNT); 729 mp->mnt_data = (qaddr_t)0; 730 } 731 return (error); 732 } 733 734 /* 735 * Unmount the filesystem described by mp. 736 */ 737 static int 738 msdosfs_unmount(mp, mntflags, td) 739 struct mount *mp; 740 int mntflags; 741 struct thread *td; 742 { 743 struct msdosfsmount *pmp; 744 int error, flags; 745 746 flags = 0; 747 if (mntflags & MNT_FORCE) 748 flags |= FORCECLOSE; 749 error = vflush(mp, 0, flags, td); 750 if (error) 751 return error; 752 pmp = VFSTOMSDOSFS(mp); 753 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 754 if (pmp->pm_w2u) 755 msdosfs_iconv->close(pmp->pm_w2u); 756 if (pmp->pm_u2w) 757 msdosfs_iconv->close(pmp->pm_u2w); 758 if (pmp->pm_d2u) 759 msdosfs_iconv->close(pmp->pm_d2u); 760 if (pmp->pm_u2d) 761 msdosfs_iconv->close(pmp->pm_u2d); 762 } 763 764 /* If the volume was mounted read/write, mark it clean now. */ 765 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 766 error = markvoldirty(pmp, 0); 767 if (error && (flags & FORCECLOSE) == 0) 768 return (error); 769 } 770 #ifdef MSDOSFS_DEBUG 771 { 772 struct vnode *vp = pmp->pm_devvp; 773 774 VI_LOCK(vp); 775 vn_printf(vp, 776 "msdosfs_umount(): just before calling VOP_CLOSE()\n"); 777 printf("freef %p, freeb %p, mount %p\n", 778 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 779 vp->v_mount); 780 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 781 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd), 782 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd), 783 vp->v_bufobj.bo_numoutput, vp->v_type); 784 VI_UNLOCK(vp); 785 } 786 #endif 787 DROP_GIANT(); 788 g_topology_lock(); 789 g_vfs_close(pmp->pm_cp, td); 790 g_topology_unlock(); 791 PICKUP_GIANT(); 792 vrele(pmp->pm_devvp); 793 free(pmp->pm_inusemap, M_MSDOSFSFAT); 794 #ifdef MSDOSFS_LARGE 795 msdosfs_fileno_free(mp); 796 #endif 797 free(pmp, M_MSDOSFSMNT); 798 mp->mnt_data = (qaddr_t)0; 799 mp->mnt_flag &= ~MNT_LOCAL; 800 return (error); 801 } 802 803 static int 804 msdosfs_root(mp, flags, vpp, td) 805 struct mount *mp; 806 int flags; 807 struct vnode **vpp; 808 struct thread *td; 809 { 810 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 811 struct denode *ndep; 812 int error; 813 814 #ifdef MSDOSFS_DEBUG 815 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 816 #endif 817 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 818 if (error) 819 return (error); 820 *vpp = DETOV(ndep); 821 return (0); 822 } 823 824 static int 825 msdosfs_statfs(mp, sbp, td) 826 struct mount *mp; 827 struct statfs *sbp; 828 struct thread *td; 829 { 830 struct msdosfsmount *pmp; 831 832 pmp = VFSTOMSDOSFS(mp); 833 sbp->f_bsize = pmp->pm_bpcluster; 834 sbp->f_iosize = pmp->pm_bpcluster; 835 sbp->f_blocks = pmp->pm_maxcluster + 1; 836 sbp->f_bfree = pmp->pm_freeclustercount; 837 sbp->f_bavail = pmp->pm_freeclustercount; 838 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 839 sbp->f_ffree = 0; /* what to put in here? */ 840 return (0); 841 } 842 843 static int 844 msdosfs_sync(mp, waitfor, td) 845 struct mount *mp; 846 int waitfor; 847 struct thread *td; 848 { 849 struct vnode *vp, *nvp; 850 struct denode *dep; 851 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 852 int error, allerror = 0; 853 854 /* 855 * If we ever switch to not updating all of the fats all the time, 856 * this would be the place to update them from the first one. 857 */ 858 if (pmp->pm_fmod != 0) { 859 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 860 panic("msdosfs_sync: rofs mod"); 861 else { 862 /* update fats here */ 863 } 864 } 865 /* 866 * Write back each (modified) denode. 867 */ 868 MNT_ILOCK(mp); 869 loop: 870 MNT_VNODE_FOREACH(vp, mp, nvp) { 871 VI_LOCK(vp); 872 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) { 873 VI_UNLOCK(vp); 874 continue; 875 } 876 MNT_IUNLOCK(mp); 877 dep = VTODE(vp); 878 if ((dep->de_flag & 879 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 880 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 881 waitfor == MNT_LAZY)) { 882 VI_UNLOCK(vp); 883 MNT_ILOCK(mp); 884 continue; 885 } 886 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 887 if (error) { 888 MNT_ILOCK(mp); 889 if (error == ENOENT) 890 goto loop; 891 continue; 892 } 893 error = VOP_FSYNC(vp, waitfor, td); 894 if (error) 895 allerror = error; 896 VOP_UNLOCK(vp, 0, td); 897 vrele(vp); 898 MNT_ILOCK(mp); 899 } 900 MNT_IUNLOCK(mp); 901 902 /* 903 * Flush filesystem control info. 904 */ 905 if (waitfor != MNT_LAZY) { 906 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 907 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 908 if (error) 909 allerror = error; 910 VOP_UNLOCK(pmp->pm_devvp, 0, td); 911 } 912 return (allerror); 913 } 914 915 static int 916 msdosfs_fhtovp(mp, fhp, vpp) 917 struct mount *mp; 918 struct fid *fhp; 919 struct vnode **vpp; 920 { 921 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 922 struct defid *defhp = (struct defid *) fhp; 923 struct denode *dep; 924 int error; 925 926 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 927 if (error) { 928 *vpp = NULLVP; 929 return (error); 930 } 931 *vpp = DETOV(dep); 932 vnode_create_vobject(*vpp, dep->de_FileSize, curthread); 933 return (0); 934 } 935 936 static int 937 msdosfs_vptofh(vp, fhp) 938 struct vnode *vp; 939 struct fid *fhp; 940 { 941 struct denode *dep; 942 struct defid *defhp; 943 944 dep = VTODE(vp); 945 defhp = (struct defid *)fhp; 946 defhp->defid_len = sizeof(struct defid); 947 defhp->defid_dirclust = dep->de_dirclust; 948 defhp->defid_dirofs = dep->de_diroffset; 949 /* defhp->defid_gen = dep->de_gen; */ 950 return (0); 951 } 952 953 static struct vfsops msdosfs_vfsops = { 954 .vfs_fhtovp = msdosfs_fhtovp, 955 .vfs_mount = msdosfs_mount, 956 .vfs_cmount = msdosfs_cmount, 957 .vfs_root = msdosfs_root, 958 .vfs_statfs = msdosfs_statfs, 959 .vfs_sync = msdosfs_sync, 960 .vfs_unmount = msdosfs_unmount, 961 .vfs_vptofh = msdosfs_vptofh, 962 }; 963 964 VFS_SET(msdosfs_vfsops, msdosfs, 0); 965 MODULE_VERSION(msdosfs, 1);
Cache object: bff8fe4e36258aae5307eda3de729562
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