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 1.28 2005/09/17 07:43:10 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 vnodeopv_entry_desc msdosfs_vnodeop_entries[]; 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 thread *td, 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 thread *); 100 static int msdosfs_root (struct mount *, struct vnode **); 101 static int msdosfs_statfs (struct mount *, struct statfs *, 102 struct thread *); 103 static int msdosfs_sync (struct mount *, int, struct thread *); 104 static int msdosfs_unmount (struct mount *, int, struct thread *); 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 thread *td) 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 proc *p = td->td_proc; 174 struct nlookupdata nd; 175 176 KKASSERT(p); 177 178 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 179 if (error) 180 return (error); 181 if (args.magic != MSDOSFS_ARGSMAGIC) 182 args.flags = 0; 183 /* 184 * If updating, check whether changing from read-only to 185 * read/write; if there is no device name, that's all we do. 186 */ 187 if (mp->mnt_flag & MNT_UPDATE) { 188 pmp = VFSTOMSDOSFS(mp); 189 error = 0; 190 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 191 flags = WRITECLOSE; 192 if (mp->mnt_flag & MNT_FORCE) 193 flags |= FORCECLOSE; 194 error = vflush(mp, 0, flags); 195 } 196 if (!error && (mp->mnt_flag & MNT_RELOAD)) 197 /* not yet implemented */ 198 error = EOPNOTSUPP; 199 if (error) 200 return (error); 201 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 202 /* 203 * If upgrade to read-write by non-root, then verify 204 * that user has necessary permissions on the device. 205 */ 206 if (p->p_ucred->cr_uid != 0) { 207 devvp = pmp->pm_devvp; 208 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 209 error = VOP_ACCESS(devvp, VREAD | VWRITE, 210 p->p_ucred, td); 211 if (error) { 212 VOP_UNLOCK(devvp, 0, td); 213 return (error); 214 } 215 VOP_UNLOCK(devvp, 0, td); 216 } 217 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 218 } 219 if (args.fspec == 0) { 220 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 221 if (args.flags & MSDOSFSMNT_MNTOPT) { 222 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 223 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 224 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 225 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 226 } 227 #endif 228 /* 229 * Process export requests. 230 */ 231 return (vfs_export(mp, &pmp->pm_export, &args.export)); 232 } 233 } 234 /* 235 * Not an update, or updating the name: look up the name 236 * and verify that it refers to a sensible block device. 237 */ 238 devvp = NULL; 239 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); 240 if (error == 0) 241 error = nlookup(&nd); 242 if (error == 0) 243 error = cache_vref(nd.nl_ncp, nd.nl_cred, &devvp); 244 nlookup_done(&nd); 245 if (error) 246 return (error); 247 248 if (!vn_isdisk(devvp, &error)) { 249 vrele(devvp); 250 return (error); 251 } 252 /* 253 * If mount by non-root, then verify that user has necessary 254 * permissions on the device. 255 */ 256 if (p->p_ucred->cr_uid != 0) { 257 accessmode = VREAD; 258 if ((mp->mnt_flag & MNT_RDONLY) == 0) 259 accessmode |= VWRITE; 260 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 261 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, td); 262 if (error) { 263 vput(devvp); 264 return (error); 265 } 266 VOP_UNLOCK(devvp, 0, td); 267 } 268 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 269 error = mountmsdosfs(devvp, mp, td, &args); 270 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 271 pmp = VFSTOMSDOSFS(mp); 272 #endif 273 } else { 274 if (devvp != pmp->pm_devvp) 275 error = EINVAL; /* XXX needs translation */ 276 else 277 vrele(devvp); 278 } 279 if (error) { 280 vrele(devvp); 281 return (error); 282 } 283 284 error = update_mp(mp, &args); 285 if (error) { 286 msdosfs_unmount(mp, MNT_FORCE, td); 287 return error; 288 } 289 290 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 291 &size); 292 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 293 (void) msdosfs_statfs(mp, &mp->mnt_stat, td); 294 #ifdef MSDOSFS_DEBUG 295 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 296 #endif 297 return (0); 298 } 299 300 static int 301 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct thread *td, 302 struct msdosfs_args *argp) 303 { 304 struct msdosfsmount *pmp; 305 struct buf *bp; 306 dev_t dev; 307 #ifndef __DragonFly__ 308 struct partinfo dpart; 309 int bsize = 0, dtype = 0, tmp; 310 #endif 311 union bootsector *bsp; 312 struct byte_bpb33 *b33; 313 struct byte_bpb50 *b50; 314 struct byte_bpb710 *b710; 315 u_int8_t SecPerClust; 316 u_long clusters; 317 int ronly, error; 318 319 /* 320 * Disallow multiple mounts of the same device. 321 * Disallow mounting of a device that is currently in use 322 * Flush out any old buffers remaining from a previous use. 323 */ 324 error = vfs_mountedon(devvp); 325 if (error) 326 return (error); 327 if (count_udev(devvp->v_udev) > 0) 328 return (EBUSY); 329 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 330 error = vinvalbuf(devvp, V_SAVE, td, 0, 0); 331 VOP_UNLOCK(devvp, 0, td); 332 if (error) 333 return (error); 334 335 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 336 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 337 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL, td); 338 VOP_UNLOCK(devvp, 0, td); 339 if (error) 340 return (error); 341 dev = devvp->v_rdev; 342 bp = NULL; /* both used in error_exit */ 343 pmp = NULL; 344 345 #ifndef __DragonFly__ 346 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 347 /* 348 * We need the disklabel to calculate the size of a FAT entry 349 * later on. Also make sure the partition contains a filesystem 350 * of type FS_MSDOS. This doesn't work for floppies, so we have 351 * to check for them too. 352 * 353 * At least some parts of the msdos fs driver seem to assume 354 * that the size of a disk block will always be 512 bytes. 355 * Let's check it... 356 */ 357 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, td); 358 if (error) 359 goto error_exit; 360 tmp = dpart.part->p_fstype; 361 dtype = dpart.disklab->d_type; 362 bsize = dpart.disklab->d_secsize; 363 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 364 error = EINVAL; 365 goto error_exit; 366 } 367 } 368 #endif 369 370 /* 371 * Read the boot sector of the filesystem, and then check the 372 * boot signature. If not a dos boot sector then error out. 373 * 374 * NOTE: 2048 is a maximum sector size in current... 375 */ 376 error = bread(devvp, 0, 2048, &bp); 377 if (error) 378 goto error_exit; 379 bp->b_flags |= B_AGE; 380 bsp = (union bootsector *)bp->b_data; 381 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 382 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 383 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 384 385 #ifndef __DragonFly__ 386 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 387 #endif 388 #ifndef MSDOSFS_NOCHECKSIG 389 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 390 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 391 error = EINVAL; 392 goto error_exit; 393 } 394 #endif 395 #ifndef __DragonFly__ 396 } 397 #endif 398 399 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 400 bzero((caddr_t)pmp, sizeof *pmp); 401 pmp->pm_mountp = mp; 402 403 /* 404 * Compute several useful quantities from the bpb in the 405 * bootsector. Copy in the dos 5 variant of the bpb then fix up 406 * the fields that are different between dos 5 and dos 3.3. 407 */ 408 SecPerClust = b50->bpbSecPerClust; 409 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 410 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 411 pmp->pm_FATs = b50->bpbFATs; 412 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 413 pmp->pm_Sectors = getushort(b50->bpbSectors); 414 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 415 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 416 pmp->pm_Heads = getushort(b50->bpbHeads); 417 pmp->pm_Media = b50->bpbMedia; 418 419 /* calculate the ratio of sector size to DEV_BSIZE */ 420 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 421 422 #ifndef __DragonFly__ 423 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 424 #endif 425 /* XXX - We should probably check more values here */ 426 if (!pmp->pm_BytesPerSec || !SecPerClust 427 || !pmp->pm_Heads 428 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 429 error = EINVAL; 430 goto error_exit; 431 } 432 #ifndef __DragonFly__ 433 } 434 #endif 435 436 if (pmp->pm_Sectors == 0) { 437 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 438 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 439 } else { 440 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 441 pmp->pm_HugeSectors = pmp->pm_Sectors; 442 } 443 if (pmp->pm_HugeSectors > 0xffffffff / 444 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 445 /* 446 * We cannot deal currently with this size of disk 447 * due to fileid limitations (see msdosfs_getattr and 448 * msdosfs_readdir) 449 */ 450 error = EINVAL; 451 printf("mountmsdosfs(): disk too big, sorry\n"); 452 goto error_exit; 453 } 454 455 if (pmp->pm_RootDirEnts == 0) { 456 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 457 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 458 || pmp->pm_Sectors 459 || pmp->pm_FATsecs 460 || getushort(b710->bpbFSVers)) { 461 error = EINVAL; 462 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 463 goto error_exit; 464 } 465 pmp->pm_fatmask = FAT32_MASK; 466 pmp->pm_fatmult = 4; 467 pmp->pm_fatdiv = 1; 468 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 469 if (getushort(b710->bpbExtFlags) & FATMIRROR) 470 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 471 else 472 pmp->pm_flags |= MSDOSFS_FATMIRROR; 473 } else 474 pmp->pm_flags |= MSDOSFS_FATMIRROR; 475 476 /* 477 * Check a few values (could do some more): 478 * - logical sector size: power of 2, >= block size 479 * - sectors per cluster: power of 2, >= 1 480 * - number of sectors: >= 1, <= size of partition 481 */ 482 if ( (SecPerClust == 0) 483 || (SecPerClust & (SecPerClust - 1)) 484 || (pmp->pm_BytesPerSec < DEV_BSIZE) 485 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 486 || (pmp->pm_HugeSectors == 0) 487 ) { 488 error = EINVAL; 489 goto error_exit; 490 } 491 492 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 493 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 494 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 495 SecPerClust *= pmp->pm_BlkPerSec; 496 497 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 498 499 if (FAT32(pmp)) { 500 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 501 pmp->pm_firstcluster = pmp->pm_fatblk 502 + (pmp->pm_FATs * pmp->pm_FATsecs); 503 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 504 } else { 505 pmp->pm_rootdirblk = pmp->pm_fatblk + 506 (pmp->pm_FATs * pmp->pm_FATsecs); 507 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 508 + DEV_BSIZE - 1) 509 / DEV_BSIZE; /* in blocks */ 510 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 511 } 512 513 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 514 SecPerClust + 1; 515 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 516 517 #ifndef __DragonFly__ 518 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 519 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 520 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 521 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 522 ) { 523 pmp->pm_fatmask = FAT12_MASK; 524 pmp->pm_fatmult = 3; 525 pmp->pm_fatdiv = 2; 526 } else { 527 pmp->pm_fatmask = FAT16_MASK; 528 pmp->pm_fatmult = 2; 529 pmp->pm_fatdiv = 1; 530 } 531 } else 532 #endif 533 if (pmp->pm_fatmask == 0) { 534 if (pmp->pm_maxcluster 535 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 536 /* 537 * This will usually be a floppy disk. This size makes 538 * sure that one fat entry will not be split across 539 * multiple blocks. 540 */ 541 pmp->pm_fatmask = FAT12_MASK; 542 pmp->pm_fatmult = 3; 543 pmp->pm_fatdiv = 2; 544 } else { 545 pmp->pm_fatmask = FAT16_MASK; 546 pmp->pm_fatmult = 2; 547 pmp->pm_fatdiv = 1; 548 } 549 } 550 551 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 552 if (pmp->pm_maxcluster >= clusters) { 553 printf("Warning: number of clusters (%ld) exceeds FAT " 554 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 555 pmp->pm_maxcluster = clusters - 1; 556 } 557 558 559 if (FAT12(pmp)) 560 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 561 else 562 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 563 564 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 565 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 566 567 /* 568 * Compute mask and shift value for isolating cluster relative byte 569 * offsets and cluster numbers from a file offset. 570 */ 571 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 572 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 573 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 574 575 /* 576 * Check for valid cluster size 577 * must be a power of 2 578 */ 579 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 580 error = EINVAL; 581 goto error_exit; 582 } 583 584 /* 585 * Release the bootsector buffer. 586 */ 587 brelse(bp); 588 bp = NULL; 589 590 /* 591 * Check FSInfo. 592 */ 593 if (pmp->pm_fsinfo) { 594 struct fsinfo *fp; 595 596 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), &bp)) != 0) 597 goto error_exit; 598 fp = (struct fsinfo *)bp->b_data; 599 if (!bcmp(fp->fsisig1, "RRaA", 4) 600 && !bcmp(fp->fsisig2, "rrAa", 4) 601 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 602 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 603 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 604 if (pmp->pm_nxtfree == 0xffffffff) 605 pmp->pm_nxtfree = CLUST_FIRST; 606 } else 607 pmp->pm_fsinfo = 0; 608 brelse(bp); 609 bp = NULL; 610 } 611 612 /* 613 * Check and validate (or perhaps invalidate?) the fsinfo structure? 614 */ 615 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 616 printf( 617 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 618 pmp->pm_nxtfree, pmp->pm_maxcluster); 619 error = EINVAL; 620 goto error_exit; 621 } 622 623 /* 624 * Allocate memory for the bitmap of allocated clusters, and then 625 * fill it in. 626 */ 627 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 628 / N_INUSEBITS) 629 * sizeof(*pmp->pm_inusemap), 630 M_MSDOSFSFAT, M_WAITOK); 631 632 /* 633 * fillinusemap() needs pm_devvp. 634 */ 635 pmp->pm_dev = dev; 636 pmp->pm_devvp = devvp; 637 638 /* 639 * Have the inuse map filled in. 640 */ 641 if ((error = fillinusemap(pmp)) != 0) 642 goto error_exit; 643 644 /* 645 * If they want fat updates to be synchronous then let them suffer 646 * the performance degradation in exchange for the on disk copy of 647 * the fat being correct just about all the time. I suppose this 648 * would be a good thing to turn on if the kernel is still flakey. 649 */ 650 if (mp->mnt_flag & MNT_SYNCHRONOUS) 651 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 652 653 /* 654 * Finish up. 655 */ 656 if (ronly) 657 pmp->pm_flags |= MSDOSFSMNT_RONLY; 658 else 659 pmp->pm_fmod = 1; 660 mp->mnt_data = (qaddr_t) pmp; 661 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 662 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 663 mp->mnt_flag |= MNT_LOCAL; 664 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, 665 msdosfs_vnodeop_entries, 0); 666 dev->si_mountpoint = mp; 667 668 return 0; 669 670 error_exit: 671 if (bp) 672 brelse(bp); 673 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, td); 674 if (pmp) { 675 if (pmp->pm_inusemap) 676 free(pmp->pm_inusemap, M_MSDOSFSFAT); 677 free(pmp, M_MSDOSFSMNT); 678 mp->mnt_data = (qaddr_t)0; 679 } 680 return (error); 681 } 682 683 /* 684 * Unmount the filesystem described by mp. 685 */ 686 static int 687 msdosfs_unmount(struct mount *mp, int mntflags, struct thread *td) 688 { 689 struct msdosfsmount *pmp; 690 int error, flags; 691 692 flags = 0; 693 if (mntflags & MNT_FORCE) 694 flags |= FORCECLOSE; 695 error = vflush(mp, 0, flags); 696 if (error) 697 return error; 698 pmp = VFSTOMSDOSFS(mp); 699 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 700 #ifdef MSDOSFS_DEBUG 701 { 702 struct vnode *vp = pmp->pm_devvp; 703 704 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 705 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 706 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 707 printf("id %lu, mount %p, op %p\n", 708 vp->v_id, vp->v_mount, vp->v_op); 709 printf("freef %p, freeb %p, mount %p\n", 710 TAILQ_NEXT(vp, v_freelist), TAILQ_PREV(vp, v_freelist), 711 vp->v_mount); 712 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 713 RB_EMPTY(&vp->v_rbclean_tree), 714 RB_EMPTY(&vp->v_rbdirty_tree), 715 vp->v_numoutput, vp->v_type); 716 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 717 vp->v_socket, vp->v_tag, 718 ((u_int *)vp->v_data)[0], 719 ((u_int *)vp->v_data)[1]); 720 } 721 #endif 722 error = VOP_CLOSE(pmp->pm_devvp, 723 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 724 td); 725 vrele(pmp->pm_devvp); 726 free(pmp->pm_inusemap, M_MSDOSFSFAT); 727 free(pmp, M_MSDOSFSMNT); 728 mp->mnt_data = (qaddr_t)0; 729 mp->mnt_flag &= ~MNT_LOCAL; 730 return (error); 731 } 732 733 static int 734 msdosfs_root(struct mount *mp, struct vnode **vpp) 735 { 736 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 737 struct denode *ndep; 738 int error; 739 740 #ifdef MSDOSFS_DEBUG 741 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 742 #endif 743 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 744 if (error) 745 return (error); 746 *vpp = DETOV(ndep); 747 return (0); 748 } 749 750 static int 751 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 752 { 753 struct msdosfsmount *pmp; 754 755 pmp = VFSTOMSDOSFS(mp); 756 sbp->f_bsize = pmp->pm_bpcluster; 757 sbp->f_iosize = pmp->pm_bpcluster; 758 sbp->f_blocks = pmp->pm_maxcluster + 1; 759 sbp->f_bfree = pmp->pm_freeclustercount; 760 sbp->f_bavail = pmp->pm_freeclustercount; 761 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 762 sbp->f_ffree = 0; /* what to put in here? */ 763 if (sbp != &mp->mnt_stat) { 764 sbp->f_type = mp->mnt_vfc->vfc_typenum; 765 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 766 } 767 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 768 return (0); 769 } 770 771 struct scaninfo { 772 int rescan; 773 int allerror; 774 int waitfor; 775 thread_t td; 776 }; 777 778 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data); 779 780 static int 781 msdosfs_sync(struct mount *mp, int waitfor, struct thread *td) 782 { 783 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 784 struct scaninfo scaninfo; 785 int error; 786 787 /* 788 * If we ever switch to not updating all of the fats all the time, 789 * this would be the place to update them from the first one. 790 */ 791 if (pmp->pm_fmod != 0) { 792 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 793 panic("msdosfs_sync: rofs mod"); 794 else { 795 /* update fats here */ 796 } 797 } 798 /* 799 * Write back each (modified) denode. 800 */ 801 scaninfo.allerror = 0; 802 scaninfo.rescan = 1; 803 scaninfo.td = td; 804 while (scaninfo.rescan) { 805 scaninfo.rescan = 0; 806 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo); 807 } 808 809 /* 810 * Flush filesystem control info. 811 */ 812 if (waitfor != MNT_LAZY) { 813 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 814 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, td)) != 0) 815 scaninfo.allerror = error; 816 VOP_UNLOCK(pmp->pm_devvp, 0, td); 817 } 818 return (scaninfo.allerror); 819 } 820 821 static int 822 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) 823 { 824 struct scaninfo *info = data; 825 struct denode *dep; 826 int error; 827 828 dep = VTODE(vp); 829 if (vp->v_type == VNON || 830 ((dep->de_flag & 831 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 832 (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) { 833 return(0); 834 } 835 if ((error = VOP_FSYNC(vp, info->waitfor, info->td)) != 0) 836 info->allerror = error; 837 return(0); 838 } 839 840 static int 841 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 842 { 843 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 844 struct defid *defhp = (struct defid *) fhp; 845 struct denode *dep; 846 int error; 847 848 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 849 if (error) { 850 *vpp = NULLVP; 851 return (error); 852 } 853 *vpp = DETOV(dep); 854 return (0); 855 } 856 857 static int 858 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 859 struct ucred **credanonp) 860 { 861 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 862 struct netcred *np; 863 864 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 865 if (np == NULL) 866 return (EACCES); 867 *exflagsp = np->netc_exflags; 868 *credanonp = &np->netc_anon; 869 return (0); 870 } 871 872 static int 873 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 874 { 875 struct denode *dep; 876 struct defid *defhp; 877 878 dep = VTODE(vp); 879 defhp = (struct defid *)fhp; 880 defhp->defid_len = sizeof(struct defid); 881 defhp->defid_dirclust = dep->de_dirclust; 882 defhp->defid_dirofs = dep->de_diroffset; 883 /* defhp->defid_gen = dep->de_gen; */ 884 return (0); 885 } 886 887 static struct vfsops msdosfs_vfsops = { 888 .vfs_mount = msdosfs_mount, 889 .vfs_unmount = msdosfs_unmount, 890 .vfs_root = msdosfs_root, 891 .vfs_statfs = msdosfs_statfs, 892 .vfs_sync = msdosfs_sync, 893 .vfs_fhtovp = msdosfs_fhtovp, 894 .vfs_checkexp = msdosfs_checkexp, 895 .vfs_vptofh = msdosfs_vptofh, 896 .vfs_init = msdosfs_init, 897 .vfs_uninit = msdosfs_uninit 898 }; 899 900 VFS_SET(msdosfs_vfsops, msdos, 0); 901