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 1.36 2006/07/18 22:22:15 dillon 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 VOP_UNLOCK(devvp, 0); 209 return (error); 210 } 211 VOP_UNLOCK(devvp, 0); 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_ncp, 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 VOP_UNLOCK(devvp, 0); 263 } 264 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 265 error = mountmsdosfs(devvp, mp, &args); 266 #ifdef MSDOSFS_DEBUG /* only needed for the printf 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 printf("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 dev_t dev; 301 #ifndef __DragonFly__ 302 struct partinfo dpart; 303 int bsize = 0, dtype = 0, tmp; 304 #endif 305 union bootsector *bsp; 306 struct byte_bpb33 *b33; 307 struct byte_bpb50 *b50; 308 struct byte_bpb710 *b710; 309 u_int8_t SecPerClust; 310 u_long clusters; 311 int ronly, error; 312 313 /* 314 * Disallow multiple mounts of the same device. 315 * Disallow mounting of a device that is currently in use 316 * Flush out any old buffers remaining from a previous use. 317 */ 318 error = vfs_mountedon(devvp); 319 if (error) 320 return (error); 321 if (count_udev(devvp->v_udev) > 0) 322 return (EBUSY); 323 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 324 error = vinvalbuf(devvp, V_SAVE, 0, 0); 325 VOP_UNLOCK(devvp, 0); 326 if (error) 327 return (error); 328 329 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 330 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 331 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL); 332 VOP_UNLOCK(devvp, 0); 333 if (error) 334 return (error); 335 dev = devvp->v_rdev; 336 bp = NULL; /* both used in error_exit */ 337 pmp = NULL; 338 339 #ifndef __DragonFly__ 340 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 341 /* 342 * We need the disklabel to calculate the size of a FAT entry 343 * later on. Also make sure the partition contains a filesystem 344 * of type FS_MSDOS. This doesn't work for floppies, so we have 345 * to check for them too. 346 * 347 * At least some parts of the msdos fs driver seem to assume 348 * that the size of a disk block will always be 512 bytes. 349 * Let's check it... 350 */ 351 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD); 352 if (error) 353 goto error_exit; 354 tmp = dpart.part->p_fstype; 355 dtype = dpart.disklab->d_type; 356 bsize = dpart.disklab->d_secsize; 357 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 358 error = EINVAL; 359 goto error_exit; 360 } 361 } 362 #endif 363 364 /* 365 * Read the boot sector of the filesystem, and then check the 366 * boot signature. If not a dos boot sector then error out. 367 * 368 * NOTE: 2048 is a maximum sector size in current... 369 */ 370 error = bread(devvp, 0, 2048, &bp); 371 if (error) 372 goto error_exit; 373 bp->b_flags |= B_AGE; 374 bsp = (union bootsector *)bp->b_data; 375 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 376 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 377 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 378 379 #ifndef __DragonFly__ 380 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 381 #endif 382 #ifndef MSDOSFS_NOCHECKSIG 383 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 384 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 385 error = EINVAL; 386 goto error_exit; 387 } 388 #endif 389 #ifndef __DragonFly__ 390 } 391 #endif 392 393 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 394 bzero((caddr_t)pmp, sizeof *pmp); 395 pmp->pm_mountp = mp; 396 397 /* 398 * Compute several useful quantities from the bpb in the 399 * bootsector. Copy in the dos 5 variant of the bpb then fix up 400 * the fields that are different between dos 5 and dos 3.3. 401 */ 402 SecPerClust = b50->bpbSecPerClust; 403 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 404 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 405 pmp->pm_FATs = b50->bpbFATs; 406 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 407 pmp->pm_Sectors = getushort(b50->bpbSectors); 408 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 409 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 410 pmp->pm_Heads = getushort(b50->bpbHeads); 411 pmp->pm_Media = b50->bpbMedia; 412 413 /* calculate the ratio of sector size to DEV_BSIZE */ 414 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 415 416 #ifndef __DragonFly__ 417 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 418 #endif 419 /* XXX - We should probably check more values here */ 420 if (!pmp->pm_BytesPerSec || !SecPerClust 421 || !pmp->pm_Heads 422 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 423 error = EINVAL; 424 goto error_exit; 425 } 426 #ifndef __DragonFly__ 427 } 428 #endif 429 430 if (pmp->pm_Sectors == 0) { 431 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 432 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 433 } else { 434 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 435 pmp->pm_HugeSectors = pmp->pm_Sectors; 436 } 437 if (pmp->pm_HugeSectors > 0xffffffff / 438 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 439 /* 440 * We cannot deal currently with this size of disk 441 * due to fileid limitations (see msdosfs_getattr and 442 * msdosfs_readdir) 443 */ 444 error = EINVAL; 445 printf("mountmsdosfs(): disk too big, sorry\n"); 446 goto error_exit; 447 } 448 449 if (pmp->pm_RootDirEnts == 0) { 450 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 451 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 452 || pmp->pm_Sectors 453 || pmp->pm_FATsecs 454 || getushort(b710->bpbFSVers)) { 455 error = EINVAL; 456 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 457 goto error_exit; 458 } 459 pmp->pm_fatmask = FAT32_MASK; 460 pmp->pm_fatmult = 4; 461 pmp->pm_fatdiv = 1; 462 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 463 if (getushort(b710->bpbExtFlags) & FATMIRROR) 464 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 465 else 466 pmp->pm_flags |= MSDOSFS_FATMIRROR; 467 } else 468 pmp->pm_flags |= MSDOSFS_FATMIRROR; 469 470 /* 471 * Check a few values (could do some more): 472 * - logical sector size: power of 2, >= block size 473 * - sectors per cluster: power of 2, >= 1 474 * - number of sectors: >= 1, <= size of partition 475 */ 476 if ( (SecPerClust == 0) 477 || (SecPerClust & (SecPerClust - 1)) 478 || (pmp->pm_BytesPerSec < DEV_BSIZE) 479 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 480 || (pmp->pm_HugeSectors == 0) 481 ) { 482 error = EINVAL; 483 goto error_exit; 484 } 485 486 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 487 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 488 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 489 SecPerClust *= pmp->pm_BlkPerSec; 490 491 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 492 493 if (FAT32(pmp)) { 494 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 495 pmp->pm_firstcluster = pmp->pm_fatblk 496 + (pmp->pm_FATs * pmp->pm_FATsecs); 497 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 498 } else { 499 pmp->pm_rootdirblk = pmp->pm_fatblk + 500 (pmp->pm_FATs * pmp->pm_FATsecs); 501 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 502 + DEV_BSIZE - 1) 503 / DEV_BSIZE; /* in blocks */ 504 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 505 } 506 507 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 508 SecPerClust + 1; 509 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 510 511 #ifndef __DragonFly__ 512 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 513 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 514 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 515 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 516 ) { 517 pmp->pm_fatmask = FAT12_MASK; 518 pmp->pm_fatmult = 3; 519 pmp->pm_fatdiv = 2; 520 } else { 521 pmp->pm_fatmask = FAT16_MASK; 522 pmp->pm_fatmult = 2; 523 pmp->pm_fatdiv = 1; 524 } 525 } else 526 #endif 527 if (pmp->pm_fatmask == 0) { 528 if (pmp->pm_maxcluster 529 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 530 /* 531 * This will usually be a floppy disk. This size makes 532 * sure that one fat entry will not be split across 533 * multiple blocks. 534 */ 535 pmp->pm_fatmask = FAT12_MASK; 536 pmp->pm_fatmult = 3; 537 pmp->pm_fatdiv = 2; 538 } else { 539 pmp->pm_fatmask = FAT16_MASK; 540 pmp->pm_fatmult = 2; 541 pmp->pm_fatdiv = 1; 542 } 543 } 544 545 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 546 if (pmp->pm_maxcluster >= clusters) { 547 printf("Warning: number of clusters (%ld) exceeds FAT " 548 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 549 pmp->pm_maxcluster = clusters - 1; 550 } 551 552 553 if (FAT12(pmp)) 554 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 555 else 556 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 557 558 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 559 pmp->pm_bnshift = DEV_BSHIFT; 560 561 /* 562 * Compute mask and shift value for isolating cluster relative byte 563 * offsets and cluster numbers from a file offset. 564 */ 565 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 566 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 567 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 568 569 /* 570 * Check for valid cluster size 571 * must be a power of 2 572 */ 573 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 574 error = EINVAL; 575 goto error_exit; 576 } 577 578 /* 579 * Release the bootsector buffer. 580 */ 581 brelse(bp); 582 bp = NULL; 583 584 /* 585 * Check FSInfo. 586 */ 587 if (pmp->pm_fsinfo) { 588 struct fsinfo *fp; 589 590 if ((error = bread(devvp, de_bntodoff(pmp, pmp->pm_fsinfo), fsi_size(pmp), &bp)) != 0) 591 goto error_exit; 592 fp = (struct fsinfo *)bp->b_data; 593 if (!bcmp(fp->fsisig1, "RRaA", 4) 594 && !bcmp(fp->fsisig2, "rrAa", 4) 595 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 596 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 597 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 598 if (pmp->pm_nxtfree == 0xffffffff) 599 pmp->pm_nxtfree = CLUST_FIRST; 600 } else 601 pmp->pm_fsinfo = 0; 602 brelse(bp); 603 bp = NULL; 604 } 605 606 /* 607 * Check and validate (or perhaps invalidate?) the fsinfo structure? 608 */ 609 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 610 printf( 611 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 612 pmp->pm_nxtfree, pmp->pm_maxcluster); 613 error = EINVAL; 614 goto error_exit; 615 } 616 617 /* 618 * Allocate memory for the bitmap of allocated clusters, and then 619 * fill it in. 620 */ 621 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 622 / N_INUSEBITS) 623 * sizeof(*pmp->pm_inusemap), 624 M_MSDOSFSFAT, M_WAITOK); 625 626 /* 627 * fillinusemap() needs pm_devvp. 628 */ 629 pmp->pm_dev = dev; 630 pmp->pm_devvp = devvp; 631 632 /* 633 * Have the inuse map filled in. 634 */ 635 if ((error = fillinusemap(pmp)) != 0) 636 goto error_exit; 637 638 /* 639 * If they want fat updates to be synchronous then let them suffer 640 * the performance degradation in exchange for the on disk copy of 641 * the fat being correct just about all the time. I suppose this 642 * would be a good thing to turn on if the kernel is still flakey. 643 */ 644 if (mp->mnt_flag & MNT_SYNCHRONOUS) 645 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 646 647 /* 648 * Finish up. 649 */ 650 if (ronly) 651 pmp->pm_flags |= MSDOSFSMNT_RONLY; 652 else 653 pmp->pm_fmod = 1; 654 mp->mnt_data = (qaddr_t) pmp; 655 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 656 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 657 mp->mnt_flag |= MNT_LOCAL; 658 vfs_add_vnodeops(mp, &msdosfs_vnode_vops, &mp->mnt_vn_norm_ops); 659 dev->si_mountpoint = mp; 660 661 return 0; 662 663 error_exit: 664 if (bp) 665 brelse(bp); 666 VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE); 667 if (pmp) { 668 if (pmp->pm_inusemap) 669 free(pmp->pm_inusemap, M_MSDOSFSFAT); 670 free(pmp, M_MSDOSFSMNT); 671 mp->mnt_data = (qaddr_t)0; 672 } 673 return (error); 674 } 675 676 /* 677 * Unmount the filesystem described by mp. 678 */ 679 static int 680 msdosfs_unmount(struct mount *mp, int mntflags) 681 { 682 struct msdosfsmount *pmp; 683 int error, flags; 684 685 flags = 0; 686 if (mntflags & MNT_FORCE) 687 flags |= FORCECLOSE; 688 error = vflush(mp, 0, flags); 689 if (error) 690 return error; 691 pmp = VFSTOMSDOSFS(mp); 692 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 693 #ifdef MSDOSFS_DEBUG 694 { 695 struct vnode *vp = pmp->pm_devvp; 696 697 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 698 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 699 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 700 printf("mount %p, op %p\n", vp->v_mount, vp->v_op); 701 printf("freef %p, freeb %p, mount %p\n", 702 TAILQ_NEXT(vp, v_freelist), TAILQ_PREV(vp, v_freelist), 703 vp->v_mount); 704 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 705 RB_EMPTY(&vp->v_rbclean_tree), 706 RB_EMPTY(&vp->v_rbdirty_tree), 707 vp->v_track_write.bk_active, vp->v_type); 708 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 709 vp->v_socket, vp->v_tag, 710 ((u_int *)vp->v_data)[0], 711 ((u_int *)vp->v_data)[1]); 712 } 713 #endif 714 error = VOP_CLOSE(pmp->pm_devvp, 715 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE); 716 vrele(pmp->pm_devvp); 717 free(pmp->pm_inusemap, M_MSDOSFSFAT); 718 free(pmp, M_MSDOSFSMNT); 719 mp->mnt_data = (qaddr_t)0; 720 mp->mnt_flag &= ~MNT_LOCAL; 721 return (error); 722 } 723 724 static int 725 msdosfs_root(struct mount *mp, struct vnode **vpp) 726 { 727 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 728 struct denode *ndep; 729 int error; 730 731 #ifdef MSDOSFS_DEBUG 732 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 733 #endif 734 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 735 if (error) 736 return (error); 737 *vpp = DETOV(ndep); 738 return (0); 739 } 740 741 static int 742 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 743 { 744 struct msdosfsmount *pmp; 745 746 pmp = VFSTOMSDOSFS(mp); 747 sbp->f_bsize = pmp->pm_bpcluster; 748 sbp->f_iosize = pmp->pm_bpcluster; 749 sbp->f_blocks = pmp->pm_maxcluster + 1; 750 sbp->f_bfree = pmp->pm_freeclustercount; 751 sbp->f_bavail = pmp->pm_freeclustercount; 752 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 753 sbp->f_ffree = 0; /* what to put in here? */ 754 if (sbp != &mp->mnt_stat) { 755 sbp->f_type = mp->mnt_vfc->vfc_typenum; 756 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 757 } 758 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 759 return (0); 760 } 761 762 struct scaninfo { 763 int rescan; 764 int allerror; 765 int waitfor; 766 }; 767 768 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data); 769 770 static int 771 msdosfs_sync(struct mount *mp, int waitfor) 772 { 773 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 774 struct scaninfo scaninfo; 775 int error; 776 777 /* 778 * If we ever switch to not updating all of the fats all the time, 779 * this would be the place to update them from the first one. 780 */ 781 if (pmp->pm_fmod != 0) { 782 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 783 panic("msdosfs_sync: rofs mod"); 784 else { 785 /* update fats here */ 786 } 787 } 788 /* 789 * Write back each (modified) denode. 790 */ 791 scaninfo.allerror = 0; 792 scaninfo.rescan = 1; 793 while (scaninfo.rescan) { 794 scaninfo.rescan = 0; 795 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo); 796 } 797 798 /* 799 * Flush filesystem control info. 800 */ 801 if (waitfor != MNT_LAZY) { 802 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 803 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor)) != 0) 804 scaninfo.allerror = error; 805 VOP_UNLOCK(pmp->pm_devvp, 0); 806 } 807 return (scaninfo.allerror); 808 } 809 810 static int 811 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) 812 { 813 struct scaninfo *info = data; 814 struct denode *dep; 815 int error; 816 817 dep = VTODE(vp); 818 if (vp->v_type == VNON || 819 ((dep->de_flag & 820 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 821 (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) { 822 return(0); 823 } 824 if ((error = VOP_FSYNC(vp, info->waitfor)) != 0) 825 info->allerror = error; 826 return(0); 827 } 828 829 static int 830 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 831 { 832 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 833 struct defid *defhp = (struct defid *) fhp; 834 struct denode *dep; 835 int error; 836 837 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 838 if (error) { 839 *vpp = NULLVP; 840 return (error); 841 } 842 *vpp = DETOV(dep); 843 return (0); 844 } 845 846 static int 847 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 848 struct ucred **credanonp) 849 { 850 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 851 struct netcred *np; 852 853 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 854 if (np == NULL) 855 return (EACCES); 856 *exflagsp = np->netc_exflags; 857 *credanonp = &np->netc_anon; 858 return (0); 859 } 860 861 static int 862 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 863 { 864 struct denode *dep; 865 struct defid *defhp; 866 867 dep = VTODE(vp); 868 defhp = (struct defid *)fhp; 869 defhp->defid_len = sizeof(struct defid); 870 defhp->defid_dirclust = dep->de_dirclust; 871 defhp->defid_dirofs = dep->de_diroffset; 872 /* defhp->defid_gen = dep->de_gen; */ 873 return (0); 874 } 875 876 static struct vfsops msdosfs_vfsops = { 877 .vfs_mount = msdosfs_mount, 878 .vfs_unmount = msdosfs_unmount, 879 .vfs_root = msdosfs_root, 880 .vfs_statfs = msdosfs_statfs, 881 .vfs_sync = msdosfs_sync, 882 .vfs_fhtovp = msdosfs_fhtovp, 883 .vfs_checkexp = msdosfs_checkexp, 884 .vfs_vptofh = msdosfs_vptofh, 885 .vfs_init = msdosfs_init, 886 .vfs_uninit = msdosfs_uninit 887 }; 888 889 VFS_SET(msdosfs_vfsops, msdos, 0); 890