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 1.26 2005/07/26 15:43:35 hmp 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 #ifdef PC98 429 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 430 #else 431 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 432 #endif 433 error = EINVAL; 434 goto error_exit; 435 } 436 #ifndef __DragonFly__ 437 } 438 #endif 439 440 if (pmp->pm_Sectors == 0) { 441 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 442 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 443 } else { 444 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 445 pmp->pm_HugeSectors = pmp->pm_Sectors; 446 } 447 if (pmp->pm_HugeSectors > 0xffffffff / 448 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 449 /* 450 * We cannot deal currently with this size of disk 451 * due to fileid limitations (see msdosfs_getattr and 452 * msdosfs_readdir) 453 */ 454 error = EINVAL; 455 printf("mountmsdosfs(): disk too big, sorry\n"); 456 goto error_exit; 457 } 458 459 if (pmp->pm_RootDirEnts == 0) { 460 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 461 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 462 || pmp->pm_Sectors 463 || pmp->pm_FATsecs 464 || getushort(b710->bpbFSVers)) { 465 error = EINVAL; 466 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 467 goto error_exit; 468 } 469 pmp->pm_fatmask = FAT32_MASK; 470 pmp->pm_fatmult = 4; 471 pmp->pm_fatdiv = 1; 472 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 473 if (getushort(b710->bpbExtFlags) & FATMIRROR) 474 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 475 else 476 pmp->pm_flags |= MSDOSFS_FATMIRROR; 477 } else 478 pmp->pm_flags |= MSDOSFS_FATMIRROR; 479 480 /* 481 * Check a few values (could do some more): 482 * - logical sector size: power of 2, >= block size 483 * - sectors per cluster: power of 2, >= 1 484 * - number of sectors: >= 1, <= size of partition 485 */ 486 if ( (SecPerClust == 0) 487 || (SecPerClust & (SecPerClust - 1)) 488 || (pmp->pm_BytesPerSec < DEV_BSIZE) 489 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 490 || (pmp->pm_HugeSectors == 0) 491 ) { 492 error = EINVAL; 493 goto error_exit; 494 } 495 496 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 497 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 498 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 499 SecPerClust *= pmp->pm_BlkPerSec; 500 501 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 502 503 if (FAT32(pmp)) { 504 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 505 pmp->pm_firstcluster = pmp->pm_fatblk 506 + (pmp->pm_FATs * pmp->pm_FATsecs); 507 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 508 } else { 509 pmp->pm_rootdirblk = pmp->pm_fatblk + 510 (pmp->pm_FATs * pmp->pm_FATsecs); 511 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 512 + DEV_BSIZE - 1) 513 / DEV_BSIZE; /* in blocks */ 514 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 515 } 516 517 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 518 SecPerClust + 1; 519 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 520 521 #ifndef __DragonFly__ 522 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 523 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 524 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 525 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 526 ) { 527 pmp->pm_fatmask = FAT12_MASK; 528 pmp->pm_fatmult = 3; 529 pmp->pm_fatdiv = 2; 530 } else { 531 pmp->pm_fatmask = FAT16_MASK; 532 pmp->pm_fatmult = 2; 533 pmp->pm_fatdiv = 1; 534 } 535 } else 536 #endif 537 if (pmp->pm_fatmask == 0) { 538 if (pmp->pm_maxcluster 539 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 540 /* 541 * This will usually be a floppy disk. This size makes 542 * sure that one fat entry will not be split across 543 * multiple blocks. 544 */ 545 pmp->pm_fatmask = FAT12_MASK; 546 pmp->pm_fatmult = 3; 547 pmp->pm_fatdiv = 2; 548 } else { 549 pmp->pm_fatmask = FAT16_MASK; 550 pmp->pm_fatmult = 2; 551 pmp->pm_fatdiv = 1; 552 } 553 } 554 555 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 556 if (pmp->pm_maxcluster >= clusters) { 557 printf("Warning: number of clusters (%ld) exceeds FAT " 558 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 559 pmp->pm_maxcluster = clusters - 1; 560 } 561 562 563 if (FAT12(pmp)) 564 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 565 else 566 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 567 568 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 569 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 570 571 /* 572 * Compute mask and shift value for isolating cluster relative byte 573 * offsets and cluster numbers from a file offset. 574 */ 575 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 576 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 577 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 578 579 /* 580 * Check for valid cluster size 581 * must be a power of 2 582 */ 583 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 584 error = EINVAL; 585 goto error_exit; 586 } 587 588 /* 589 * Release the bootsector buffer. 590 */ 591 brelse(bp); 592 bp = NULL; 593 594 /* 595 * Check FSInfo. 596 */ 597 if (pmp->pm_fsinfo) { 598 struct fsinfo *fp; 599 600 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), &bp)) != 0) 601 goto error_exit; 602 fp = (struct fsinfo *)bp->b_data; 603 if (!bcmp(fp->fsisig1, "RRaA", 4) 604 && !bcmp(fp->fsisig2, "rrAa", 4) 605 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 606 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 607 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 608 if (pmp->pm_nxtfree == 0xffffffff) 609 pmp->pm_nxtfree = CLUST_FIRST; 610 } else 611 pmp->pm_fsinfo = 0; 612 brelse(bp); 613 bp = NULL; 614 } 615 616 /* 617 * Check and validate (or perhaps invalidate?) the fsinfo structure? 618 */ 619 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 620 printf( 621 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 622 pmp->pm_nxtfree, pmp->pm_maxcluster); 623 error = EINVAL; 624 goto error_exit; 625 } 626 627 /* 628 * Allocate memory for the bitmap of allocated clusters, and then 629 * fill it in. 630 */ 631 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 632 / N_INUSEBITS) 633 * sizeof(*pmp->pm_inusemap), 634 M_MSDOSFSFAT, M_WAITOK); 635 636 /* 637 * fillinusemap() needs pm_devvp. 638 */ 639 pmp->pm_dev = dev; 640 pmp->pm_devvp = devvp; 641 642 /* 643 * Have the inuse map filled in. 644 */ 645 if ((error = fillinusemap(pmp)) != 0) 646 goto error_exit; 647 648 /* 649 * If they want fat updates to be synchronous then let them suffer 650 * the performance degradation in exchange for the on disk copy of 651 * the fat being correct just about all the time. I suppose this 652 * would be a good thing to turn on if the kernel is still flakey. 653 */ 654 if (mp->mnt_flag & MNT_SYNCHRONOUS) 655 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 656 657 /* 658 * Finish up. 659 */ 660 if (ronly) 661 pmp->pm_flags |= MSDOSFSMNT_RONLY; 662 else 663 pmp->pm_fmod = 1; 664 mp->mnt_data = (qaddr_t) pmp; 665 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 666 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 667 mp->mnt_flag |= MNT_LOCAL; 668 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, msdosfs_vnodeop_entries); 669 dev->si_mountpoint = mp; 670 671 return 0; 672 673 error_exit: 674 if (bp) 675 brelse(bp); 676 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, td); 677 if (pmp) { 678 if (pmp->pm_inusemap) 679 free(pmp->pm_inusemap, M_MSDOSFSFAT); 680 free(pmp, M_MSDOSFSMNT); 681 mp->mnt_data = (qaddr_t)0; 682 } 683 return (error); 684 } 685 686 /* 687 * Unmount the filesystem described by mp. 688 */ 689 static int 690 msdosfs_unmount(struct mount *mp, int mntflags, struct thread *td) 691 { 692 struct msdosfsmount *pmp; 693 int error, flags; 694 695 flags = 0; 696 if (mntflags & MNT_FORCE) 697 flags |= FORCECLOSE; 698 error = vflush(mp, 0, flags); 699 if (error) 700 return error; 701 pmp = VFSTOMSDOSFS(mp); 702 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 703 #ifdef MSDOSFS_DEBUG 704 { 705 struct vnode *vp = pmp->pm_devvp; 706 707 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 708 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 709 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 710 printf("id %lu, mount %p, op %p\n", 711 vp->v_id, vp->v_mount, vp->v_op); 712 printf("freef %p, freeb %p, mount %p\n", 713 TAILQ_NEXT(vp, v_freelist), TAILQ_PREV(vp, v_freelist), 714 vp->v_mount); 715 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 716 RB_EMPTY(&vp->v_rbclean_tree), 717 RB_EMPTY(&vp->v_rbdirty_tree), 718 vp->v_numoutput, vp->v_type); 719 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 720 vp->v_socket, vp->v_tag, 721 ((u_int *)vp->v_data)[0], 722 ((u_int *)vp->v_data)[1]); 723 } 724 #endif 725 error = VOP_CLOSE(pmp->pm_devvp, 726 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 727 td); 728 vrele(pmp->pm_devvp); 729 free(pmp->pm_inusemap, M_MSDOSFSFAT); 730 free(pmp, M_MSDOSFSMNT); 731 mp->mnt_data = (qaddr_t)0; 732 mp->mnt_flag &= ~MNT_LOCAL; 733 return (error); 734 } 735 736 static int 737 msdosfs_root(struct mount *mp, struct vnode **vpp) 738 { 739 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 740 struct denode *ndep; 741 int error; 742 743 #ifdef MSDOSFS_DEBUG 744 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 745 #endif 746 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 747 if (error) 748 return (error); 749 *vpp = DETOV(ndep); 750 return (0); 751 } 752 753 static int 754 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 755 { 756 struct msdosfsmount *pmp; 757 758 pmp = VFSTOMSDOSFS(mp); 759 sbp->f_bsize = pmp->pm_bpcluster; 760 sbp->f_iosize = pmp->pm_bpcluster; 761 sbp->f_blocks = pmp->pm_maxcluster + 1; 762 sbp->f_bfree = pmp->pm_freeclustercount; 763 sbp->f_bavail = pmp->pm_freeclustercount; 764 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 765 sbp->f_ffree = 0; /* what to put in here? */ 766 if (sbp != &mp->mnt_stat) { 767 sbp->f_type = mp->mnt_vfc->vfc_typenum; 768 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 769 } 770 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 771 return (0); 772 } 773 774 struct scaninfo { 775 int rescan; 776 int allerror; 777 int waitfor; 778 thread_t td; 779 }; 780 781 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data); 782 783 static int 784 msdosfs_sync(struct mount *mp, int waitfor, struct thread *td) 785 { 786 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 787 struct scaninfo scaninfo; 788 int error; 789 790 /* 791 * If we ever switch to not updating all of the fats all the time, 792 * this would be the place to update them from the first one. 793 */ 794 if (pmp->pm_fmod != 0) { 795 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 796 panic("msdosfs_sync: rofs mod"); 797 else { 798 /* update fats here */ 799 } 800 } 801 /* 802 * Write back each (modified) denode. 803 */ 804 scaninfo.allerror = 0; 805 scaninfo.rescan = 1; 806 scaninfo.td = td; 807 while (scaninfo.rescan) { 808 scaninfo.rescan = 0; 809 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo); 810 } 811 812 /* 813 * Flush filesystem control info. 814 */ 815 if (waitfor != MNT_LAZY) { 816 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 817 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, td)) != 0) 818 scaninfo.allerror = error; 819 VOP_UNLOCK(pmp->pm_devvp, 0, td); 820 } 821 return (scaninfo.allerror); 822 } 823 824 static int 825 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) 826 { 827 struct scaninfo *info = data; 828 struct denode *dep; 829 int error; 830 831 dep = VTODE(vp); 832 if (vp->v_type == VNON || 833 ((dep->de_flag & 834 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 835 (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) { 836 return(0); 837 } 838 if ((error = VOP_FSYNC(vp, info->waitfor, info->td)) != 0) 839 info->allerror = error; 840 return(0); 841 } 842 843 static int 844 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 845 { 846 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 847 struct defid *defhp = (struct defid *) fhp; 848 struct denode *dep; 849 int error; 850 851 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 852 if (error) { 853 *vpp = NULLVP; 854 return (error); 855 } 856 *vpp = DETOV(dep); 857 return (0); 858 } 859 860 static int 861 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 862 struct ucred **credanonp) 863 { 864 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 865 struct netcred *np; 866 867 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 868 if (np == NULL) 869 return (EACCES); 870 *exflagsp = np->netc_exflags; 871 *credanonp = &np->netc_anon; 872 return (0); 873 } 874 875 static int 876 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 877 { 878 struct denode *dep; 879 struct defid *defhp; 880 881 dep = VTODE(vp); 882 defhp = (struct defid *)fhp; 883 defhp->defid_len = sizeof(struct defid); 884 defhp->defid_dirclust = dep->de_dirclust; 885 defhp->defid_dirofs = dep->de_diroffset; 886 /* defhp->defid_gen = dep->de_gen; */ 887 return (0); 888 } 889 890 static struct vfsops msdosfs_vfsops = { 891 .vfs_mount = msdosfs_mount, 892 .vfs_unmount = msdosfs_unmount, 893 .vfs_root = msdosfs_root, 894 .vfs_statfs = msdosfs_statfs, 895 .vfs_sync = msdosfs_sync, 896 .vfs_fhtovp = msdosfs_fhtovp, 897 .vfs_checkexp = msdosfs_checkexp, 898 .vfs_vptofh = msdosfs_vptofh, 899 .vfs_init = msdosfs_init, 900 .vfs_uninit = msdosfs_uninit 901 }; 902 903 VFS_SET(msdosfs_vfsops, msdos, 0); 904