msdosfs_vfsops.c revision 131551
1/* $FreeBSD: head/sys/fs/msdosfs/msdosfs_vfsops.c 131551 2004-07-04 08:52:35Z phk $ */ 2/* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ 3 4/*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35/* 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51#include <sys/param.h> 52#include <sys/systm.h> 53#include <sys/conf.h> 54#include <sys/namei.h> 55#include <sys/proc.h> 56#include <sys/kernel.h> 57#include <sys/vnode.h> 58#include <sys/mount.h> 59#include <sys/bio.h> 60#include <sys/buf.h> 61#include <sys/fcntl.h> 62#include <sys/malloc.h> 63#include <sys/stat.h> /* defines ALLPERMS */ 64#include <sys/iconv.h> 65#include <sys/mutex.h> 66 67#include <fs/msdosfs/bpb.h> 68#include <fs/msdosfs/bootsect.h> 69#include <fs/msdosfs/msdosfsmount.h> 70#include <fs/msdosfs/direntry.h> 71#include <fs/msdosfs/denode.h> 72#include <fs/msdosfs/fat.h> 73 74#include "opt_msdosfs.h" 75 76#define MSDOSFS_DFLTBSIZE 4096 77 78#if 1 /*def PC98*/ 79/* 80 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 81 * garbage or a random value :-{ 82 * If you want to use that broken-signatured media, define the 83 * following symbol even though PC/AT. 84 * (ex. mount PC-98 DOS formatted FD on PC/AT) 85 */ 86#define MSDOSFS_NOCHECKSIG 87#endif 88 89MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 90static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 91 92struct iconv_functions *msdosfs_iconv = NULL; 93 94static int update_mp(struct mount *mp, struct msdosfs_args *argp); 95static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 96 struct thread *td, struct msdosfs_args *argp); 97static vfs_fhtovp_t msdosfs_fhtovp; 98static vfs_mount_t msdosfs_mount; 99static vfs_root_t msdosfs_root; 100static vfs_statfs_t msdosfs_statfs; 101static vfs_sync_t msdosfs_sync; 102static vfs_unmount_t msdosfs_unmount; 103static vfs_vptofh_t msdosfs_vptofh; 104 105static int 106update_mp(mp, argp) 107 struct mount *mp; 108 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_dirmask = argp->dirmask & ALLPERMS; 117 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 118 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 119 msdosfs_iconv->open(argp->cs_win, argp->cs_local , &pmp->pm_u2w); 120 msdosfs_iconv->open(argp->cs_local, argp->cs_win , &pmp->pm_w2u); 121 msdosfs_iconv->open(argp->cs_dos, argp->cs_local , &pmp->pm_u2d); 122 msdosfs_iconv->open(argp->cs_local, argp->cs_dos , &pmp->pm_d2u); 123 } else { 124 pmp->pm_w2u = NULL; 125 pmp->pm_u2w = NULL; 126 pmp->pm_d2u = NULL; 127 pmp->pm_u2d = NULL; 128 } 129 130 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 131 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 132 else if (!(pmp->pm_flags & 133 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 134 struct vnode *rootvp; 135 136 /* 137 * Try to divine whether to support Win'95 long filenames 138 */ 139 if (FAT32(pmp)) 140 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 141 else { 142 if ((error = msdosfs_root(mp, &rootvp)) != 0) 143 return error; 144 pmp->pm_flags |= findwin95(VTODE(rootvp)) 145 ? MSDOSFSMNT_LONGNAME 146 : MSDOSFSMNT_SHORTNAME; 147 vput(rootvp); 148 } 149 } 150 return 0; 151} 152 153/* 154 * mp - path - addr in user space of mount point (ie /usr or whatever) 155 * data - addr in user space of mount params including the name of the block 156 * special file to treat as a filesystem. 157 */ 158static int 159msdosfs_mount(mp, path, data, ndp, td) 160 struct mount *mp; 161 char *path; 162 caddr_t data; 163 struct nameidata *ndp; 164 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; 173 174 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 175 if (error) 176 return (error); 177 if (args.magic != MSDOSFS_ARGSMAGIC) 178 args.flags = 0; 179 /* 180 * If updating, check whether changing from read-only to 181 * read/write; if there is no device name, that's all we do. 182 */ 183 if (mp->mnt_flag & MNT_UPDATE) { 184 pmp = VFSTOMSDOSFS(mp); 185 error = 0; 186 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 187 flags = WRITECLOSE; 188 if (mp->mnt_flag & MNT_FORCE) 189 flags |= FORCECLOSE; 190 error = vflush(mp, 0, flags); 191 } 192 if (!error && (mp->mnt_flag & MNT_RELOAD)) 193 /* not yet implemented */ 194 error = EOPNOTSUPP; 195 if (error) 196 return (error); 197 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 198 /* 199 * If upgrade to read-write by non-root, then verify 200 * that user has necessary permissions on the device. 201 */ 202 if (suser(td)) { 203 devvp = pmp->pm_devvp; 204 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 205 error = VOP_ACCESS(devvp, VREAD | VWRITE, 206 td->td_ucred, td); 207 if (error) { 208 VOP_UNLOCK(devvp, 0, td); 209 return (error); 210 } 211 VOP_UNLOCK(devvp, 0, td); 212 } 213 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 214 215 /* Now that the volume is modifiable, mark it dirty. */ 216 error = markvoldirty(pmp, 1); 217 if (error) 218 return (error); 219 } 220 if (args.fspec == 0) { 221#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 222 if (args.flags & MSDOSFSMNT_MNTOPT) { 223 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 224 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 225 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 226 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 227 } 228#endif 229 /* 230 * Process export requests. 231 */ 232 if ((args.export.ex_flags & MNT_EXPORTED) != 0 && 233 (pmp->pm_flags & MSDOSFS_LARGEFS) != 0) 234 return (EOPNOTSUPP); 235 return (vfs_export(mp, &args.export)); 236 } 237 } 238 /* 239 * Not an update, or updating the name: look up the name 240 * and verify that it refers to a sensible disk device. 241 */ 242 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td); 243 error = namei(ndp); 244 if (error) 245 return (error); 246 devvp = ndp->ni_vp; 247 NDFREE(ndp, NDF_ONLY_PNBUF); 248 249 if (!vn_isdisk(devvp, &error)) { 250 vrele(devvp); 251 return (error); 252 } 253 /* 254 * If mount by non-root, then verify that user has necessary 255 * permissions on the device. 256 */ 257 if (suser(td)) { 258 accessmode = VREAD; 259 if ((mp->mnt_flag & MNT_RDONLY) == 0) 260 accessmode |= VWRITE; 261 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 262 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 263 if (error) { 264 vput(devvp); 265 return (error); 266 } 267 VOP_UNLOCK(devvp, 0, td); 268 } 269 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 270 error = mountmsdosfs(devvp, mp, td, &args); 271#ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 272 pmp = VFSTOMSDOSFS(mp); 273#endif 274 } else { 275 if (devvp != pmp->pm_devvp) 276 error = EINVAL; /* XXX needs translation */ 277 else 278 vrele(devvp); 279 } 280 if (error) { 281 vrele(devvp); 282 return (error); 283 } 284 285 error = update_mp(mp, &args); 286 if (error) { 287 msdosfs_unmount(mp, MNT_FORCE, td); 288 return error; 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 300static int 301mountmsdosfs(devvp, mp, td, argp) 302 struct vnode *devvp; 303 struct mount *mp; 304 struct thread *td; 305 struct msdosfs_args *argp; 306{ 307 struct msdosfsmount *pmp; 308 struct buf *bp; 309 struct cdev *dev = devvp->v_rdev; 310 union bootsector *bsp; 311 struct byte_bpb33 *b33; 312 struct byte_bpb50 *b50; 313 struct byte_bpb710 *b710; 314 u_int8_t SecPerClust; 315 u_long clusters; 316 int ronly, error; 317 318 /* 319 * Disallow multiple mounts of the same device. 320 * Disallow mounting of a device that is currently in use 321 * (except for root, which might share swap device for miniroot). 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 (vcount(devvp) > 1 && devvp != rootvp) 328 return (EBUSY); 329 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 330 error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0); 331 if (error) { 332 VOP_UNLOCK(devvp, 0, td); 333 return (error); 334 } 335 336 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 337 /* 338 * XXX: open the device with read and write access even if only 339 * read access is needed now. Write access is needed if the 340 * filesystem is ever mounted read/write, and we don't change the 341 * access mode for remounts. 342 */ 343#ifdef notyet 344 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD | FWRITE, FSCRED, td, -1); 345#else 346 error = VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, td, -1); 347#endif 348 VOP_UNLOCK(devvp, 0, td); 349 if (error) 350 return (error); 351 352 bp = NULL; /* both used in error_exit */ 353 pmp = NULL; 354 355 /* 356 * Read the boot sector of the filesystem, and then check the 357 * boot signature. If not a dos boot sector then error out. 358 * 359 * NOTE: 2048 is a maximum sector size in current... 360 */ 361 error = bread(devvp, 0, 2048, NOCRED, &bp); 362 if (error) 363 goto error_exit; 364 bp->b_flags |= B_AGE; 365 bsp = (union bootsector *)bp->b_data; 366 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 367 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 368 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 369 370#ifndef MSDOSFS_NOCHECKSIG 371 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 372 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 373 error = EINVAL; 374 goto error_exit; 375 } 376#endif 377 378 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 379 pmp->pm_mountp = mp; 380 381 /* 382 * Compute several useful quantities from the bpb in the 383 * bootsector. Copy in the dos 5 variant of the bpb then fix up 384 * the fields that are different between dos 5 and dos 3.3. 385 */ 386 SecPerClust = b50->bpbSecPerClust; 387 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 388 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 389 error = EINVAL; 390 goto error_exit; 391 } 392 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 393 pmp->pm_FATs = b50->bpbFATs; 394 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 395 pmp->pm_Sectors = getushort(b50->bpbSectors); 396 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 397 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 398 pmp->pm_Heads = getushort(b50->bpbHeads); 399 pmp->pm_Media = b50->bpbMedia; 400 401 /* calculate the ratio of sector size to DEV_BSIZE */ 402 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 403 404 /* XXX - We should probably check more values here */ 405 if (!pmp->pm_BytesPerSec || !SecPerClust 406 || !pmp->pm_Heads 407#ifdef PC98 408 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 409#else 410 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 411#endif 412 error = EINVAL; 413 goto error_exit; 414 } 415 416 if (pmp->pm_Sectors == 0) { 417 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 418 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 419 } else { 420 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 421 pmp->pm_HugeSectors = pmp->pm_Sectors; 422 } 423#ifndef MSDOSFS_LARGE 424 if (pmp->pm_HugeSectors > 0xffffffff / 425 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 426 /* 427 * We cannot deal currently with this size of disk 428 * due to fileid limitations (see msdosfs_getattr and 429 * msdosfs_readdir) 430 */ 431 error = EINVAL; 432 printf("mountmsdosfs(): disk too big, sorry\n"); 433 goto error_exit; 434 } 435#endif /* !MSDOSFS_LARGE */ 436 437 if (pmp->pm_RootDirEnts == 0) { 438 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 439 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 440 || pmp->pm_Sectors 441 || pmp->pm_FATsecs 442 || getushort(b710->bpbFSVers)) { 443 error = EINVAL; 444 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 445 goto error_exit; 446 } 447 pmp->pm_fatmask = FAT32_MASK; 448 pmp->pm_fatmult = 4; 449 pmp->pm_fatdiv = 1; 450 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 451 if (getushort(b710->bpbExtFlags) & FATMIRROR) 452 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 453 else 454 pmp->pm_flags |= MSDOSFS_FATMIRROR; 455 } else 456 pmp->pm_flags |= MSDOSFS_FATMIRROR; 457 458 /* 459 * Check a few values (could do some more): 460 * - logical sector size: power of 2, >= block size 461 * - sectors per cluster: power of 2, >= 1 462 * - number of sectors: >= 1, <= size of partition 463 * - number of FAT sectors: >= 1 464 */ 465 if ( (SecPerClust == 0) 466 || (SecPerClust & (SecPerClust - 1)) 467 || (pmp->pm_BytesPerSec < DEV_BSIZE) 468 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 469 || (pmp->pm_HugeSectors == 0) 470 || (pmp->pm_FATsecs == 0) 471 ) { 472 error = EINVAL; 473 goto error_exit; 474 } 475 476 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 477 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 478 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 479 SecPerClust *= pmp->pm_BlkPerSec; 480 481 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 482 483 if (FAT32(pmp)) { 484 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 485 pmp->pm_firstcluster = pmp->pm_fatblk 486 + (pmp->pm_FATs * pmp->pm_FATsecs); 487 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 488 } else { 489 pmp->pm_rootdirblk = pmp->pm_fatblk + 490 (pmp->pm_FATs * pmp->pm_FATsecs); 491 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 492 + DEV_BSIZE - 1) 493 / DEV_BSIZE; /* in blocks */ 494 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 495 } 496 497 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 498 SecPerClust + 1; 499 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 500 501 if (pmp->pm_fatmask == 0) { 502 if (pmp->pm_maxcluster 503 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 504 /* 505 * This will usually be a floppy disk. This size makes 506 * sure that one fat entry will not be split across 507 * multiple blocks. 508 */ 509 pmp->pm_fatmask = FAT12_MASK; 510 pmp->pm_fatmult = 3; 511 pmp->pm_fatdiv = 2; 512 } else { 513 pmp->pm_fatmask = FAT16_MASK; 514 pmp->pm_fatmult = 2; 515 pmp->pm_fatdiv = 1; 516 } 517 } 518 519 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 520 if (pmp->pm_maxcluster >= clusters) { 521 printf("Warning: number of clusters (%ld) exceeds FAT " 522 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 523 pmp->pm_maxcluster = clusters - 1; 524 } 525 526 527 if (FAT12(pmp)) 528 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 529 else 530 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 531 532 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 533 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 534 535 /* 536 * Compute mask and shift value for isolating cluster relative byte 537 * offsets and cluster numbers from a file offset. 538 */ 539 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 540 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 541 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 542 543 /* 544 * Check for valid cluster size 545 * must be a power of 2 546 */ 547 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 548 error = EINVAL; 549 goto error_exit; 550 } 551 552 /* 553 * Release the bootsector buffer. 554 */ 555 brelse(bp); 556 bp = NULL; 557 558 /* 559 * Check FSInfo. 560 */ 561 if (pmp->pm_fsinfo) { 562 struct fsinfo *fp; 563 564 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 565 NOCRED, &bp)) != 0) 566 goto error_exit; 567 fp = (struct fsinfo *)bp->b_data; 568 if (!bcmp(fp->fsisig1, "RRaA", 4) 569 && !bcmp(fp->fsisig2, "rrAa", 4) 570 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 571 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 572 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 573 if (pmp->pm_nxtfree == 0xffffffff) 574 pmp->pm_nxtfree = CLUST_FIRST; 575 } else 576 pmp->pm_fsinfo = 0; 577 brelse(bp); 578 bp = NULL; 579 } 580 581 /* 582 * Check and validate (or perhaps invalidate?) the fsinfo structure? 583 */ 584 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 585 printf( 586 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 587 pmp->pm_nxtfree, pmp->pm_maxcluster); 588 error = EINVAL; 589 goto error_exit; 590 } 591 592 /* 593 * Allocate memory for the bitmap of allocated clusters, and then 594 * fill it in. 595 */ 596 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 597 * sizeof(*pmp->pm_inusemap), 598 M_MSDOSFSFAT, M_WAITOK); 599 600 /* 601 * fillinusemap() needs pm_devvp. 602 */ 603 pmp->pm_dev = dev; 604 pmp->pm_devvp = devvp; 605 606 /* 607 * Have the inuse map filled in. 608 */ 609 if ((error = fillinusemap(pmp)) != 0) 610 goto error_exit; 611 612 /* 613 * If they want fat updates to be synchronous then let them suffer 614 * the performance degradation in exchange for the on disk copy of 615 * the fat being correct just about all the time. I suppose this 616 * would be a good thing to turn on if the kernel is still flakey. 617 */ 618 if (mp->mnt_flag & MNT_SYNCHRONOUS) 619 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 620 621 /* 622 * Finish up. 623 */ 624 if (ronly) 625 pmp->pm_flags |= MSDOSFSMNT_RONLY; 626 else { 627 /* Mark the volume dirty while it is mounted read/write. */ 628 if ((error = markvoldirty(pmp, 1)) != 0) 629 goto error_exit; 630 pmp->pm_fmod = 1; 631 } 632 mp->mnt_data = (qaddr_t) pmp; 633 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 634 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 635 mp->mnt_flag |= MNT_LOCAL; 636 devvp->v_rdev->si_mountpoint = mp; 637 638#ifdef MSDOSFS_LARGE 639 msdosfs_fileno_init(mp); 640#endif 641 642 return 0; 643 644error_exit: 645 if (bp) 646 brelse(bp); 647 /* XXX: see comment above VOP_OPEN. */ 648#ifdef notyet 649 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, td); 650#else 651 (void)VOP_CLOSE(devvp, FREAD | FWRITE, NOCRED, td); 652#endif 653 if (pmp) { 654 if (pmp->pm_inusemap) 655 free(pmp->pm_inusemap, M_MSDOSFSFAT); 656 free(pmp, M_MSDOSFSMNT); 657 mp->mnt_data = (qaddr_t)0; 658 } 659 return (error); 660} 661 662/* 663 * Unmount the filesystem described by mp. 664 */ 665static int 666msdosfs_unmount(mp, mntflags, td) 667 struct mount *mp; 668 int mntflags; 669 struct thread *td; 670{ 671 struct msdosfsmount *pmp; 672 int error, flags; 673 674 flags = 0; 675 if (mntflags & MNT_FORCE) 676 flags |= FORCECLOSE; 677 error = vflush(mp, 0, flags); 678 if (error) 679 return error; 680 pmp = VFSTOMSDOSFS(mp); 681 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 682 if (pmp->pm_w2u) 683 msdosfs_iconv->close(pmp->pm_w2u); 684 if (pmp->pm_u2w) 685 msdosfs_iconv->close(pmp->pm_u2w); 686 if (pmp->pm_d2u) 687 msdosfs_iconv->close(pmp->pm_d2u); 688 if (pmp->pm_u2d) 689 msdosfs_iconv->close(pmp->pm_u2d); 690 } 691 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 692 693 /* If the volume was mounted read/write, mark it clean now. */ 694 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 695 error = markvoldirty(pmp, 0); 696 if (error && (flags & FORCECLOSE) == 0) 697 return (error); 698 } 699#ifdef MSDOSFS_DEBUG 700 { 701 struct vnode *vp = pmp->pm_devvp; 702 703 VI_LOCK(vp); 704 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 705 printf("iflag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 706 vp->vi_flag, vp->v_usecount, vp->v_writecount, 707 vp->v_holdcnt); 708 printf("id %lu, mount %p, op %p\n", 709 vp->v_id, vp->v_mount, vp->v_op); 710 printf("freef %p, freeb %p, mount %p\n", 711 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 712 vp->v_mount); 713 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 714 TAILQ_FIRST(&vp->v_cleanblkhd), 715 TAILQ_FIRST(&vp->v_dirtyblkhd), 716 vp->v_numoutput, vp->v_type); 717 printf("union %p, tag %s, data[0] %08x, data[1] %08x\n", 718 vp->v_socket, vp->v_tag, 719 ((u_int *)vp->v_data)[0], 720 ((u_int *)vp->v_data)[1]); 721 VI_UNLOCK(vp); 722 } 723#endif 724 /* XXX: see comment above VOP_OPEN. */ 725#ifdef notyet 726 error = VOP_CLOSE(pmp->pm_devvp, 727 (pmp->pm_flags & MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 728 NOCRED, td); 729#else 730 error = VOP_CLOSE(pmp->pm_devvp, FREAD | FWRITE, NOCRED, td); 731#endif 732 vrele(pmp->pm_devvp); 733 free(pmp->pm_inusemap, M_MSDOSFSFAT); 734#ifdef MSDOSFS_LARGE 735 msdosfs_fileno_free(mp); 736#endif 737 free(pmp, M_MSDOSFSMNT); 738 mp->mnt_data = (qaddr_t)0; 739 mp->mnt_flag &= ~MNT_LOCAL; 740 return (error); 741} 742 743static int 744msdosfs_root(mp, vpp) 745 struct mount *mp; 746 struct vnode **vpp; 747{ 748 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 749 struct denode *ndep; 750 int error; 751 752#ifdef MSDOSFS_DEBUG 753 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 754#endif 755 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 756 if (error) 757 return (error); 758 *vpp = DETOV(ndep); 759 return (0); 760} 761 762static int 763msdosfs_statfs(mp, sbp, td) 764 struct mount *mp; 765 struct statfs *sbp; 766 struct thread *td; 767{ 768 struct msdosfsmount *pmp; 769 770 pmp = VFSTOMSDOSFS(mp); 771 sbp->f_bsize = pmp->pm_bpcluster; 772 sbp->f_iosize = pmp->pm_bpcluster; 773 sbp->f_blocks = pmp->pm_maxcluster + 1; 774 sbp->f_bfree = pmp->pm_freeclustercount; 775 sbp->f_bavail = pmp->pm_freeclustercount; 776 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 777 sbp->f_ffree = 0; /* what to put in here? */ 778 if (sbp != &mp->mnt_stat) { 779 sbp->f_type = mp->mnt_vfc->vfc_typenum; 780 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 781 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 782 } 783 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 784 return (0); 785} 786 787static int 788msdosfs_sync(mp, waitfor, cred, td) 789 struct mount *mp; 790 int waitfor; 791 struct ucred *cred; 792 struct thread *td; 793{ 794 struct vnode *vp, *nvp; 795 struct denode *dep; 796 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 797 int error, allerror = 0; 798 799 /* 800 * If we ever switch to not updating all of the fats all the time, 801 * this would be the place to update them from the first one. 802 */ 803 if (pmp->pm_fmod != 0) { 804 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 805 panic("msdosfs_sync: rofs mod"); 806 else { 807 /* update fats here */ 808 } 809 } 810 /* 811 * Write back each (modified) denode. 812 */ 813 MNT_ILOCK(mp); 814loop: 815 MNT_VNODE_FOREACH(vp, mp, nvp) { 816 VI_LOCK(vp); 817 if (vp->v_iflag & VI_XLOCK) { 818 VI_UNLOCK(vp); 819 continue; 820 } 821 MNT_IUNLOCK(mp); 822 dep = VTODE(vp); 823 if (vp->v_type == VNON || 824 ((dep->de_flag & 825 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 826 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 827 VI_UNLOCK(vp); 828 MNT_ILOCK(mp); 829 continue; 830 } 831 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 832 if (error) { 833 MNT_ILOCK(mp); 834 if (error == ENOENT) 835 goto loop; 836 continue; 837 } 838 error = VOP_FSYNC(vp, cred, waitfor, td); 839 if (error) 840 allerror = error; 841 VOP_UNLOCK(vp, 0, td); 842 vrele(vp); 843 MNT_ILOCK(mp); 844 } 845 MNT_IUNLOCK(mp); 846 847 /* 848 * Flush filesystem control info. 849 */ 850 if (waitfor != MNT_LAZY) { 851 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 852 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, td); 853 if (error) 854 allerror = error; 855 VOP_UNLOCK(pmp->pm_devvp, 0, td); 856 } 857 return (allerror); 858} 859 860static int 861msdosfs_fhtovp(mp, fhp, vpp) 862 struct mount *mp; 863 struct fid *fhp; 864 struct vnode **vpp; 865{ 866 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 867 struct defid *defhp = (struct defid *) fhp; 868 struct denode *dep; 869 int error; 870 871 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 872 if (error) { 873 *vpp = NULLVP; 874 return (error); 875 } 876 *vpp = DETOV(dep); 877 return (0); 878} 879 880static int 881msdosfs_vptofh(vp, fhp) 882 struct vnode *vp; 883 struct fid *fhp; 884{ 885 struct denode *dep; 886 struct defid *defhp; 887 888 dep = VTODE(vp); 889 defhp = (struct defid *)fhp; 890 defhp->defid_len = sizeof(struct defid); 891 defhp->defid_dirclust = dep->de_dirclust; 892 defhp->defid_dirofs = dep->de_diroffset; 893 /* defhp->defid_gen = dep->de_gen; */ 894 return (0); 895} 896 897static struct vfsops msdosfs_vfsops = { 898 .vfs_fhtovp = msdosfs_fhtovp, 899 .vfs_init = msdosfs_init, 900 .vfs_mount = msdosfs_mount, 901 .vfs_root = msdosfs_root, 902 .vfs_statfs = msdosfs_statfs, 903 .vfs_sync = msdosfs_sync, 904 .vfs_uninit = msdosfs_uninit, 905 .vfs_unmount = msdosfs_unmount, 906 .vfs_vptofh = msdosfs_vptofh, 907}; 908 909VFS_SET(msdosfs_vfsops, msdosfs, 0); 910MODULE_VERSION(msdosfs, 1); 911