1 /* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/msdosfs/Attic/msdosfs_vfsops.c,v 1.60.2.8 2004/03/02 09:43:04 tjr Exp $ */ 2 /* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vfsops.c,v 1.49 2008/01/05 14:02:41 swildner Exp $ */ 3 /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ 4 5 /*- 6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 8 * All rights reserved. 9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by TooLs GmbH. 22 * 4. The name of TooLs GmbH may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 /* 37 * Written by Paul Popelka (paulp@uts.amdahl.com) 38 * 39 * You can do anything you want with this software, just don't say you wrote 40 * it, and don't remove this notice. 41 * 42 * This software is provided "as is". 43 * 44 * The author supplies this software to be publicly redistributed on the 45 * understanding that the author is not responsible for the correct 46 * functioning of this software in any circumstances and is not liable for 47 * any damages caused by this software. 48 * 49 * October 1992 50 */ 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/conf.h> 55 #include <sys/proc.h> 56 #include <sys/nlookup.h> 57 #include <sys/kernel.h> 58 #include <sys/vnode.h> 59 #include <sys/mount.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 <vm/vm_zone.h> 65 66 #include "bpb.h" 67 #include "bootsect.h" 68 #include "direntry.h" 69 #include "denode.h" 70 #include "msdosfsmount.h" 71 #include "fat.h" 72 73 extern struct vop_ops msdosfs_vnode_vops; 74 75 #define MSDOSFS_DFLTBSIZE 4096 76 77 #if 1 /*def PC98*/ 78 /* 79 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 80 * garbage or a random value :-{ 81 * If you want to use that broken-signatured media, define the 82 * following symbol even though PC/AT. 83 * (ex. mount PC-98 DOS formatted FD on PC/AT) 84 */ 85 #define MSDOSFS_NOCHECKSIG 86 #endif 87 88 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 89 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 90 91 static int update_mp (struct mount *mp, struct msdosfs_args *argp); 92 static int mountmsdosfs (struct vnode *devvp, struct mount *mp, 93 struct msdosfs_args *argp); 94 static int msdosfs_fhtovp (struct mount *, struct fid *, 95 struct vnode **); 96 static int msdosfs_checkexp (struct mount *, struct sockaddr *, 97 int *, struct ucred **); 98 static int msdosfs_mount (struct mount *, char *, caddr_t, 99 struct ucred *); 100 static int msdosfs_root (struct mount *, struct vnode **); 101 static int msdosfs_statfs (struct mount *, struct statfs *, 102 struct ucred *); 103 static int msdosfs_sync (struct mount *, int); 104 static int msdosfs_unmount (struct mount *, int); 105 static int msdosfs_vptofh (struct vnode *, struct fid *); 106 107 static int 108 update_mp(struct mount *mp, struct msdosfs_args *argp) 109 { 110 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 111 int error; 112 113 pmp->pm_gid = argp->gid; 114 pmp->pm_uid = argp->uid; 115 pmp->pm_mask = argp->mask & ALLPERMS; 116 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 117 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 118 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 119 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 120 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 121 } 122 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 123 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 124 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 125 } 126 127 #ifndef __DragonFly__ 128 /* 129 * GEMDOS knows nothing (yet) about win95 130 */ 131 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 132 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 133 #endif 134 135 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 136 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 137 else if (!(pmp->pm_flags & 138 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 139 struct vnode *rootvp; 140 141 /* 142 * Try to divine whether to support Win'95 long filenames 143 */ 144 if (FAT32(pmp)) 145 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 146 else { 147 if ((error = msdosfs_root(mp, &rootvp)) != 0) 148 return error; 149 pmp->pm_flags |= findwin95(VTODE(rootvp)) 150 ? MSDOSFSMNT_LONGNAME 151 : MSDOSFSMNT_SHORTNAME; 152 vput(rootvp); 153 } 154 } 155 return 0; 156 } 157 158 /* 159 * mp - path - addr in user space of mount point (ie /usr or whatever) 160 * data - addr in user space of mount params including the name of the block 161 * special file to treat as a filesystem. 162 */ 163 static int 164 msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 165 { 166 struct vnode *devvp; /* vnode for blk device to mount */ 167 struct msdosfs_args args; /* will hold data from mount request */ 168 /* msdosfs specific mount control block */ 169 struct msdosfsmount *pmp = NULL; 170 size_t size; 171 int error, flags; 172 mode_t accessmode; 173 struct nlookupdata nd; 174 175 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 176 if (error) 177 return (error); 178 if (args.magic != MSDOSFS_ARGSMAGIC) 179 args.flags = 0; 180 /* 181 * If updating, check whether changing from read-only to 182 * read/write; if there is no device name, that's all we do. 183 */ 184 if (mp->mnt_flag & MNT_UPDATE) { 185 pmp = VFSTOMSDOSFS(mp); 186 error = 0; 187 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 188 flags = WRITECLOSE; 189 if (mp->mnt_flag & MNT_FORCE) 190 flags |= FORCECLOSE; 191 error = vflush(mp, 0, flags); 192 } 193 if (!error && (mp->mnt_flag & MNT_RELOAD)) 194 /* not yet implemented */ 195 error = EOPNOTSUPP; 196 if (error) 197 return (error); 198 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 199 /* 200 * If upgrade to read-write by non-root, then verify 201 * that user has necessary permissions on the device. 202 */ 203 if (cred->cr_uid != 0) { 204 devvp = pmp->pm_devvp; 205 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 206 error = VOP_ACCESS(devvp, VREAD | VWRITE, cred); 207 if (error) { 208 vn_unlock(devvp); 209 return (error); 210 } 211 vn_unlock(devvp); 212 } 213 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 214 } 215 if (args.fspec == 0) { 216 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 217 if (args.flags & MSDOSFSMNT_MNTOPT) { 218 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 219 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 220 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 221 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 222 } 223 #endif 224 /* 225 * Process export requests. 226 */ 227 return (vfs_export(mp, &pmp->pm_export, &args.export)); 228 } 229 } 230 /* 231 * Not an update, or updating the name: look up the name 232 * and verify that it refers to a sensible block device. 233 */ 234 devvp = NULL; 235 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); 236 if (error == 0) 237 error = nlookup(&nd); 238 if (error == 0) 239 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 240 nlookup_done(&nd); 241 if (error) 242 return (error); 243 244 if (!vn_isdisk(devvp, &error)) { 245 vrele(devvp); 246 return (error); 247 } 248 /* 249 * If mount by non-root, then verify that user has necessary 250 * permissions on the device. 251 */ 252 if (cred->cr_uid != 0) { 253 accessmode = VREAD; 254 if ((mp->mnt_flag & MNT_RDONLY) == 0) 255 accessmode |= VWRITE; 256 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 257 error = VOP_ACCESS(devvp, accessmode, cred); 258 if (error) { 259 vput(devvp); 260 return (error); 261 } 262 vn_unlock(devvp); 263 } 264 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 265 error = mountmsdosfs(devvp, mp, &args); 266 #ifdef MSDOSFS_DEBUG /* only needed for the kprintf below */ 267 pmp = VFSTOMSDOSFS(mp); 268 #endif 269 } else { 270 if (devvp != pmp->pm_devvp) 271 error = EINVAL; /* XXX needs translation */ 272 else 273 vrele(devvp); 274 } 275 if (error) { 276 vrele(devvp); 277 return (error); 278 } 279 280 error = update_mp(mp, &args); 281 if (error) { 282 msdosfs_unmount(mp, MNT_FORCE); 283 return error; 284 } 285 286 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 287 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 288 msdosfs_statfs(mp, &mp->mnt_stat, cred); 289 #ifdef MSDOSFS_DEBUG 290 kprintf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 291 #endif 292 return (0); 293 } 294 295 static int 296 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct msdosfs_args *argp) 297 { 298 struct msdosfsmount *pmp; 299 struct buf *bp; 300 cdev_t dev; 301 union bootsector *bsp; 302 struct byte_bpb33 *b33; 303 struct byte_bpb50 *b50; 304 struct byte_bpb710 *b710; 305 u_int8_t SecPerClust; 306 u_long clusters; 307 int ronly, error; 308 309 /* 310 * Disallow multiple mounts of the same device. 311 * Disallow mounting of a device that is currently in use 312 * Flush out any old buffers remaining from a previous use. 313 */ 314 error = vfs_mountedon(devvp); 315 if (error) 316 return (error); 317 if (count_udev(devvp->v_umajor, devvp->v_uminor) > 0) 318 return (EBUSY); 319 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 320 error = vinvalbuf(devvp, V_SAVE, 0, 0); 321 vn_unlock(devvp); 322 if (error) 323 return (error); 324 325 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 326 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 327 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL); 328 vn_unlock(devvp); 329 if (error) 330 return (error); 331 dev = devvp->v_rdev; 332 bp = NULL; /* both used in error_exit */ 333 pmp = NULL; 334 335 /* 336 * Read the boot sector of the filesystem, and then check the 337 * boot signature. If not a dos boot sector then error out. 338 * 339 * NOTE: 2048 is a maximum sector size in current... 340 */ 341 error = bread(devvp, 0, 2048, &bp); 342 if (error) 343 goto error_exit; 344 bp->b_flags |= B_AGE; 345 bsp = (union bootsector *)bp->b_data; 346 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 347 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 348 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 349 350 #ifndef __DragonFly__ 351 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 352 #endif 353 #ifndef MSDOSFS_NOCHECKSIG 354 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 355 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 356 error = EINVAL; 357 goto error_exit; 358 } 359 #endif 360 #ifndef __DragonFly__ 361 } 362 #endif 363 364 pmp = kmalloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 365 pmp->pm_mountp = mp; 366 367 /* 368 * Compute several useful quantities from the bpb in the 369 * bootsector. Copy in the dos 5 variant of the bpb then fix up 370 * the fields that are different between dos 5 and dos 3.3. 371 */ 372 SecPerClust = b50->bpbSecPerClust; 373 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 374 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 375 pmp->pm_FATs = b50->bpbFATs; 376 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 377 pmp->pm_Sectors = getushort(b50->bpbSectors); 378 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 379 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 380 pmp->pm_Heads = getushort(b50->bpbHeads); 381 pmp->pm_Media = b50->bpbMedia; 382 383 /* calculate the ratio of sector size to DEV_BSIZE */ 384 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 385 386 #ifndef __DragonFly__ 387 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 388 #endif 389 /* XXX - We should probably check more values here */ 390 if (!pmp->pm_BytesPerSec || !SecPerClust 391 || !pmp->pm_Heads 392 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 393 error = EINVAL; 394 goto error_exit; 395 } 396 #ifndef __DragonFly__ 397 } 398 #endif 399 400 if (pmp->pm_Sectors == 0) { 401 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 402 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 403 } else { 404 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 405 pmp->pm_HugeSectors = pmp->pm_Sectors; 406 } 407 408 if (pmp->pm_RootDirEnts == 0) { 409 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 410 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 411 || pmp->pm_Sectors 412 || pmp->pm_FATsecs 413 || getushort(b710->bpbFSVers)) { 414 error = EINVAL; 415 kprintf("mountmsdosfs(): bad FAT32 filesystem\n"); 416 goto error_exit; 417 } 418 pmp->pm_fatmask = FAT32_MASK; 419 pmp->pm_fatmult = 4; 420 pmp->pm_fatdiv = 1; 421 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 422 if (getushort(b710->bpbExtFlags) & FATMIRROR) 423 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 424 else 425 pmp->pm_flags |= MSDOSFS_FATMIRROR; 426 } else 427 pmp->pm_flags |= MSDOSFS_FATMIRROR; 428 429 /* 430 * Check a few values (could do some more): 431 * - logical sector size: power of 2, >= block size 432 * - sectors per cluster: power of 2, >= 1 433 * - number of sectors: >= 1, <= size of partition 434 */ 435 if ( (SecPerClust == 0) 436 || (SecPerClust & (SecPerClust - 1)) 437 || (pmp->pm_BytesPerSec < DEV_BSIZE) 438 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 439 || (pmp->pm_HugeSectors == 0) 440 ) { 441 error = EINVAL; 442 goto error_exit; 443 } 444 445 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 446 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 447 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 448 SecPerClust *= pmp->pm_BlkPerSec; 449 450 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 451 452 if (FAT32(pmp)) { 453 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 454 pmp->pm_firstcluster = pmp->pm_fatblk 455 + (pmp->pm_FATs * pmp->pm_FATsecs); 456 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 457 } else { 458 pmp->pm_rootdirblk = pmp->pm_fatblk + 459 (pmp->pm_FATs * pmp->pm_FATsecs); 460 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 461 + DEV_BSIZE - 1) 462 / DEV_BSIZE; /* in blocks */ 463 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 464 } 465 466 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 467 SecPerClust + 1; 468 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 469 470 #ifndef __DragonFly__ 471 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 472 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 473 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 474 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 475 ) { 476 pmp->pm_fatmask = FAT12_MASK; 477 pmp->pm_fatmult = 3; 478 pmp->pm_fatdiv = 2; 479 } else { 480 pmp->pm_fatmask = FAT16_MASK; 481 pmp->pm_fatmult = 2; 482 pmp->pm_fatdiv = 1; 483 } 484 } else 485 #endif 486 if (pmp->pm_fatmask == 0) { 487 if (pmp->pm_maxcluster 488 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 489 /* 490 * This will usually be a floppy disk. This size makes 491 * sure that one fat entry will not be split across 492 * multiple blocks. 493 */ 494 pmp->pm_fatmask = FAT12_MASK; 495 pmp->pm_fatmult = 3; 496 pmp->pm_fatdiv = 2; 497 } else { 498 pmp->pm_fatmask = FAT16_MASK; 499 pmp->pm_fatmult = 2; 500 pmp->pm_fatdiv = 1; 501 } 502 } 503 504 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 505 if (pmp->pm_maxcluster >= clusters) { 506 kprintf("Warning: number of clusters (%ld) exceeds FAT " 507 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 508 pmp->pm_maxcluster = clusters - 1; 509 } 510 511 512 if (FAT12(pmp)) 513 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 514 else 515 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 516 517 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 518 pmp->pm_bnshift = DEV_BSHIFT; 519 520 /* 521 * Compute mask and shift value for isolating cluster relative byte 522 * offsets and cluster numbers from a file offset. 523 */ 524 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 525 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 526 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 527 528 /* 529 * Check for valid cluster size 530 * must be a power of 2 531 */ 532 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 533 error = EINVAL; 534 goto error_exit; 535 } 536 537 /* 538 * Release the bootsector buffer. 539 */ 540 brelse(bp); 541 bp = NULL; 542 543 /* 544 * Check FSInfo. 545 */ 546 if (pmp->pm_fsinfo) { 547 struct fsinfo *fp; 548 549 if ((error = bread(devvp, de_bntodoff(pmp, pmp->pm_fsinfo), fsi_size(pmp), &bp)) != 0) 550 goto error_exit; 551 fp = (struct fsinfo *)bp->b_data; 552 if (!bcmp(fp->fsisig1, "RRaA", 4) 553 && !bcmp(fp->fsisig2, "rrAa", 4) 554 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 555 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 556 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 557 if (pmp->pm_nxtfree == 0xffffffff) 558 pmp->pm_nxtfree = CLUST_FIRST; 559 } else 560 pmp->pm_fsinfo = 0; 561 brelse(bp); 562 bp = NULL; 563 } 564 565 /* 566 * Check and validate (or perhaps invalidate?) the fsinfo structure? 567 */ 568 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 569 kprintf( 570 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 571 pmp->pm_nxtfree, pmp->pm_maxcluster); 572 error = EINVAL; 573 goto error_exit; 574 } 575 576 /* 577 * Allocate memory for the bitmap of allocated clusters, and then 578 * fill it in. 579 */ 580 pmp->pm_inusemap = kmalloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 581 / N_INUSEBITS) 582 * sizeof(*pmp->pm_inusemap), 583 M_MSDOSFSFAT, M_WAITOK); 584 585 /* 586 * fillinusemap() needs pm_devvp. 587 */ 588 pmp->pm_dev = dev; 589 pmp->pm_devvp = devvp; 590 591 /* 592 * Have the inuse map filled in. 593 */ 594 if ((error = fillinusemap(pmp)) != 0) 595 goto error_exit; 596 597 /* 598 * If they want fat updates to be synchronous then let them suffer 599 * the performance degradation in exchange for the on disk copy of 600 * the fat being correct just about all the time. I suppose this 601 * would be a good thing to turn on if the kernel is still flakey. 602 */ 603 if (mp->mnt_flag & MNT_SYNCHRONOUS) 604 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 605 606 /* 607 * Finish up. 608 */ 609 if (ronly) 610 pmp->pm_flags |= MSDOSFSMNT_RONLY; 611 else 612 pmp->pm_fmod = 1; 613 mp->mnt_data = (qaddr_t) pmp; 614 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 615 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 616 mp->mnt_flag |= MNT_LOCAL; 617 vfs_add_vnodeops(mp, &msdosfs_vnode_vops, &mp->mnt_vn_norm_ops); 618 dev->si_mountpoint = mp; 619 620 return 0; 621 622 error_exit: 623 if (bp) 624 brelse(bp); 625 VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE); 626 if (pmp) { 627 if (pmp->pm_inusemap) 628 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 629 kfree(pmp, M_MSDOSFSMNT); 630 mp->mnt_data = (qaddr_t)0; 631 } 632 return (error); 633 } 634 635 /* 636 * Unmount the filesystem described by mp. 637 */ 638 static int 639 msdosfs_unmount(struct mount *mp, int mntflags) 640 { 641 struct msdosfsmount *pmp; 642 int error, flags; 643 644 flags = 0; 645 if (mntflags & MNT_FORCE) 646 flags |= FORCECLOSE; 647 error = vflush(mp, 0, flags); 648 if (error) 649 return error; 650 pmp = VFSTOMSDOSFS(mp); 651 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 652 #ifdef MSDOSFS_DEBUG 653 { 654 struct vnode *vp = pmp->pm_devvp; 655 656 kprintf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 657 kprintf("flag %08x, sysrefs %d, writecount %d, auxrefs %d\n", 658 vp->v_flag, vp->v_sysref.refcnt, 659 vp->v_writecount, vp->v_auxrefs); 660 kprintf("mount %p, op %p\n", vp->v_mount, vp->v_ops); 661 kprintf("freef %p, freeb %p, mount %p\n", 662 TAILQ_NEXT(vp, v_freelist), 663 *vp->v_freelist.tqe_prev, 664 vp->v_mount); 665 kprintf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 666 RB_ROOT(&vp->v_rbclean_tree), 667 RB_ROOT(&vp->v_rbdirty_tree), 668 vp->v_track_write.bk_active, vp->v_type); 669 kprintf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 670 vp->v_socket, vp->v_tag, 671 ((u_int *)vp->v_data)[0], 672 ((u_int *)vp->v_data)[1]); 673 } 674 #endif 675 error = VOP_CLOSE(pmp->pm_devvp, 676 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE); 677 vrele(pmp->pm_devvp); 678 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 679 kfree(pmp, M_MSDOSFSMNT); 680 mp->mnt_data = (qaddr_t)0; 681 mp->mnt_flag &= ~MNT_LOCAL; 682 return (error); 683 } 684 685 static int 686 msdosfs_root(struct mount *mp, struct vnode **vpp) 687 { 688 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 689 struct denode *ndep; 690 int error; 691 692 #ifdef MSDOSFS_DEBUG 693 kprintf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 694 #endif 695 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 696 if (error) 697 return (error); 698 *vpp = DETOV(ndep); 699 return (0); 700 } 701 702 static int 703 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 704 { 705 struct msdosfsmount *pmp; 706 707 pmp = VFSTOMSDOSFS(mp); 708 sbp->f_bsize = pmp->pm_bpcluster; 709 sbp->f_iosize = pmp->pm_bpcluster; 710 sbp->f_blocks = pmp->pm_maxcluster + 1; 711 sbp->f_bfree = pmp->pm_freeclustercount; 712 sbp->f_bavail = pmp->pm_freeclustercount; 713 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 714 sbp->f_ffree = 0; /* what to put in here? */ 715 if (sbp != &mp->mnt_stat) { 716 sbp->f_type = mp->mnt_vfc->vfc_typenum; 717 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 718 } 719 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 720 return (0); 721 } 722 723 struct scaninfo { 724 int rescan; 725 int allerror; 726 int waitfor; 727 }; 728 729 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data); 730 731 static int 732 msdosfs_sync(struct mount *mp, int waitfor) 733 { 734 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 735 struct scaninfo scaninfo; 736 int error; 737 738 /* 739 * If we ever switch to not updating all of the fats all the time, 740 * this would be the place to update them from the first one. 741 */ 742 if (pmp->pm_fmod != 0) { 743 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 744 panic("msdosfs_sync: rofs mod"); 745 else { 746 /* update fats here */ 747 } 748 } 749 /* 750 * Write back each (modified) denode. 751 */ 752 scaninfo.allerror = 0; 753 scaninfo.rescan = 1; 754 while (scaninfo.rescan) { 755 scaninfo.rescan = 0; 756 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo); 757 } 758 759 /* 760 * Flush filesystem control info. 761 */ 762 if (waitfor != MNT_LAZY) { 763 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 764 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor)) != 0) 765 scaninfo.allerror = error; 766 vn_unlock(pmp->pm_devvp); 767 } 768 return (scaninfo.allerror); 769 } 770 771 static int 772 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) 773 { 774 struct scaninfo *info = data; 775 struct denode *dep; 776 int error; 777 778 dep = VTODE(vp); 779 if (vp->v_type == VNON || vp->v_type == VBAD || 780 ((dep->de_flag & 781 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 782 (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) { 783 return(0); 784 } 785 if ((error = VOP_FSYNC(vp, info->waitfor)) != 0) 786 info->allerror = error; 787 return(0); 788 } 789 790 static int 791 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 792 { 793 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 794 struct defid *defhp = (struct defid *) fhp; 795 struct denode *dep; 796 int error; 797 798 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 799 if (error) { 800 *vpp = NULLVP; 801 return (error); 802 } 803 *vpp = DETOV(dep); 804 return (0); 805 } 806 807 static int 808 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 809 struct ucred **credanonp) 810 { 811 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 812 struct netcred *np; 813 814 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 815 if (np == NULL) 816 return (EACCES); 817 *exflagsp = np->netc_exflags; 818 *credanonp = &np->netc_anon; 819 return (0); 820 } 821 822 static int 823 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 824 { 825 struct denode *dep; 826 struct defid *defhp; 827 828 dep = VTODE(vp); 829 defhp = (struct defid *)fhp; 830 defhp->defid_len = sizeof(struct defid); 831 defhp->defid_dirclust = dep->de_dirclust; 832 defhp->defid_dirofs = dep->de_diroffset; 833 /* defhp->defid_gen = dep->de_gen; */ 834 return (0); 835 } 836 837 static struct vfsops msdosfs_vfsops = { 838 .vfs_mount = msdosfs_mount, 839 .vfs_unmount = msdosfs_unmount, 840 .vfs_root = msdosfs_root, 841 .vfs_statfs = msdosfs_statfs, 842 .vfs_sync = msdosfs_sync, 843 .vfs_fhtovp = msdosfs_fhtovp, 844 .vfs_checkexp = msdosfs_checkexp, 845 .vfs_vptofh = msdosfs_vptofh, 846 .vfs_init = msdosfs_init, 847 .vfs_uninit = msdosfs_uninit 848 }; 849 850 VFS_SET(msdosfs_vfsops, msdos, 0); 851