1 /* $FreeBSD$ */ 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 89 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 90 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 91 92 struct iconv_functions *msdosfs_iconv = NULL; 93 94 static int update_mp(struct mount *mp, struct msdosfs_args *argp, 95 struct thread *td); 96 static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 97 struct thread *td, struct msdosfs_args *argp); 98 static vfs_fhtovp_t msdosfs_fhtovp; 99 static vfs_omount_t msdosfs_omount; 100 static vfs_root_t msdosfs_root; 101 static vfs_statfs_t msdosfs_statfs; 102 static vfs_sync_t msdosfs_sync; 103 static vfs_unmount_t msdosfs_unmount; 104 static vfs_vptofh_t msdosfs_vptofh; 105 106 static int 107 update_mp(mp, argp, td) 108 struct mount *mp; 109 struct msdosfs_args *argp; 110 struct thread *td; 111 { 112 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 113 int error; 114 115 pmp->pm_gid = argp->gid; 116 pmp->pm_uid = argp->uid; 117 pmp->pm_mask = argp->mask & ALLPERMS; 118 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 119 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 120 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 121 msdosfs_iconv->open(argp->cs_win, argp->cs_local , &pmp->pm_u2w); 122 msdosfs_iconv->open(argp->cs_local, argp->cs_win , &pmp->pm_w2u); 123 msdosfs_iconv->open(argp->cs_dos, argp->cs_local , &pmp->pm_u2d); 124 msdosfs_iconv->open(argp->cs_local, argp->cs_dos , &pmp->pm_d2u); 125 } else { 126 pmp->pm_w2u = NULL; 127 pmp->pm_u2w = NULL; 128 pmp->pm_d2u = NULL; 129 pmp->pm_u2d = NULL; 130 } 131 132 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 133 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 134 else if (!(pmp->pm_flags & 135 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 136 struct vnode *rootvp; 137 138 /* 139 * Try to divine whether to support Win'95 long filenames 140 */ 141 if (FAT32(pmp)) 142 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 143 else { 144 if ((error = msdosfs_root(mp, &rootvp, td)) != 0) 145 return error; 146 pmp->pm_flags |= findwin95(VTODE(rootvp)) 147 ? MSDOSFSMNT_LONGNAME 148 : MSDOSFSMNT_SHORTNAME; 149 vput(rootvp); 150 } 151 } 152 return 0; 153 } 154 155 /* 156 * mp - path - addr in user space of mount point (ie /usr or whatever) 157 * data - addr in user space of mount params including the name of the block 158 * special file to treat as a filesystem. 159 */ 160 static int 161 msdosfs_omount(mp, path, data, td) 162 struct mount *mp; 163 char *path; 164 caddr_t data; 165 struct thread *td; 166 { 167 struct vnode *devvp; /* vnode for blk device to mount */ 168 struct msdosfs_args args; /* will hold data from mount request */ 169 /* msdosfs specific mount control block */ 170 struct msdosfsmount *pmp = NULL; 171 struct nameidata ndp; 172 size_t size; 173 int error, flags; 174 mode_t accessmode; 175 176 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 177 if (error) 178 return (error); 179 if (args.magic != MSDOSFS_ARGSMAGIC) 180 args.flags = 0; 181 /* 182 * If updating, check whether changing from read-only to 183 * read/write; if there is no device name, that's all we do. 184 */ 185 if (mp->mnt_flag & MNT_UPDATE) { 186 pmp = VFSTOMSDOSFS(mp); 187 error = 0; 188 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 189 flags = WRITECLOSE; 190 if (mp->mnt_flag & MNT_FORCE) 191 flags |= FORCECLOSE; 192 error = vflush(mp, 0, flags, td); 193 } 194 if (!error && (mp->mnt_flag & MNT_RELOAD)) 195 /* not yet implemented */ 196 error = EOPNOTSUPP; 197 if (error) 198 return (error); 199 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 200 /* 201 * If upgrade to read-write by non-root, then verify 202 * that user has necessary permissions on the device. 203 */ 204 if (suser(td)) { 205 devvp = pmp->pm_devvp; 206 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 207 error = VOP_ACCESS(devvp, VREAD | VWRITE, 208 td->td_ucred, td); 209 if (error) { 210 VOP_UNLOCK(devvp, 0, td); 211 return (error); 212 } 213 VOP_UNLOCK(devvp, 0, td); 214 } 215 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 216 217 /* Now that the volume is modifiable, mark it dirty. */ 218 error = markvoldirty(pmp, 1); 219 if (error) 220 return (error); 221 } 222 if (args.fspec == 0) { 223 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 224 if (args.flags & MSDOSFSMNT_MNTOPT) { 225 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 226 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 227 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 228 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 229 } 230 #endif 231 /* 232 * Process export requests. 233 */ 234 if ((args.export.ex_flags & MNT_EXPORTED) != 0 && 235 (pmp->pm_flags & MSDOSFS_LARGEFS) != 0) 236 return (EOPNOTSUPP); 237 return (vfs_export(mp, &args.export)); 238 } 239 } 240 /* 241 * Not an update, or updating the name: look up the name 242 * and verify that it refers to a sensible disk device. 243 */ 244 NDINIT(&ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td); 245 error = namei(&ndp); 246 if (error) 247 return (error); 248 devvp = ndp.ni_vp; 249 NDFREE(&ndp, NDF_ONLY_PNBUF); 250 251 if (!vn_isdisk(devvp, &error)) { 252 vrele(devvp); 253 return (error); 254 } 255 /* 256 * If mount by non-root, then verify that user has necessary 257 * permissions on the device. 258 */ 259 if (suser(td)) { 260 accessmode = VREAD; 261 if ((mp->mnt_flag & MNT_RDONLY) == 0) 262 accessmode |= VWRITE; 263 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 264 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 265 if (error) { 266 vput(devvp); 267 return (error); 268 } 269 VOP_UNLOCK(devvp, 0, td); 270 } 271 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 272 error = mountmsdosfs(devvp, mp, td, &args); 273 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 274 pmp = VFSTOMSDOSFS(mp); 275 #endif 276 } else { 277 if (devvp != pmp->pm_devvp) 278 error = EINVAL; /* XXX needs translation */ 279 else 280 vrele(devvp); 281 } 282 if (error) { 283 vrele(devvp); 284 return (error); 285 } 286 287 error = update_mp(mp, &args, td); 288 if (error) { 289 msdosfs_unmount(mp, MNT_FORCE, td); 290 return error; 291 } 292 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 293 &size); 294 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 295 (void) msdosfs_statfs(mp, &mp->mnt_stat, td); 296 #ifdef MSDOSFS_DEBUG 297 printf("msdosfs_omount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 298 #endif 299 return (0); 300 } 301 302 static int 303 mountmsdosfs(devvp, mp, td, argp) 304 struct vnode *devvp; 305 struct mount *mp; 306 struct thread *td; 307 struct msdosfs_args *argp; 308 { 309 struct msdosfsmount *pmp; 310 struct buf *bp; 311 struct cdev *dev = devvp->v_rdev; 312 union bootsector *bsp; 313 struct byte_bpb33 *b33; 314 struct byte_bpb50 *b50; 315 struct byte_bpb710 *b710; 316 u_int8_t SecPerClust; 317 u_long clusters; 318 int ronly, error; 319 320 /* 321 * Disallow multiple mounts of the same device. 322 * Disallow mounting of a device that is currently in use 323 * (except for root, which might share swap device for miniroot). 324 * Flush out any old buffers remaining from a previous use. 325 */ 326 error = vfs_mountedon(devvp); 327 if (error) 328 return (error); 329 if (vcount(devvp) > 1) 330 return (EBUSY); 331 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 332 error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0); 333 if (error) { 334 VOP_UNLOCK(devvp, 0, td); 335 return (error); 336 } 337 338 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 339 /* 340 * XXX: open the device with read and write access even if only 341 * read access is needed now. Write access is needed if the 342 * filesystem is ever mounted read/write, and we don't change the 343 * access mode for remounts. 344 */ 345 #ifdef notyet 346 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD | FWRITE, FSCRED, td, -1); 347 #else 348 error = VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, td, -1); 349 #endif 350 VOP_UNLOCK(devvp, 0, td); 351 if (error) 352 return (error); 353 354 bp = NULL; /* both used in error_exit */ 355 pmp = NULL; 356 357 /* 358 * Read the boot sector of the filesystem, and then check the 359 * boot signature. If not a dos boot sector then error out. 360 * 361 * NOTE: 2048 is a maximum sector size in current... 362 */ 363 error = bread(devvp, 0, 2048, NOCRED, &bp); 364 if (error) 365 goto error_exit; 366 bp->b_flags |= B_AGE; 367 bsp = (union bootsector *)bp->b_data; 368 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 369 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 370 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 371 372 #ifndef MSDOSFS_NOCHECKSIG 373 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 374 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 375 error = EINVAL; 376 goto error_exit; 377 } 378 #endif 379 380 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 381 pmp->pm_mountp = mp; 382 383 /* 384 * Compute several useful quantities from the bpb in the 385 * bootsector. Copy in the dos 5 variant of the bpb then fix up 386 * the fields that are different between dos 5 and dos 3.3. 387 */ 388 SecPerClust = b50->bpbSecPerClust; 389 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 390 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 391 error = EINVAL; 392 goto error_exit; 393 } 394 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 395 pmp->pm_FATs = b50->bpbFATs; 396 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 397 pmp->pm_Sectors = getushort(b50->bpbSectors); 398 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 399 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 400 pmp->pm_Heads = getushort(b50->bpbHeads); 401 pmp->pm_Media = b50->bpbMedia; 402 403 /* calculate the ratio of sector size to DEV_BSIZE */ 404 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 405 406 /* XXX - We should probably check more values here */ 407 if (!pmp->pm_BytesPerSec || !SecPerClust 408 || !pmp->pm_Heads 409 #ifdef PC98 410 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 411 #else 412 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 413 #endif 414 error = EINVAL; 415 goto error_exit; 416 } 417 418 if (pmp->pm_Sectors == 0) { 419 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 420 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 421 } else { 422 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 423 pmp->pm_HugeSectors = pmp->pm_Sectors; 424 } 425 #ifndef MSDOSFS_LARGE 426 if (pmp->pm_HugeSectors > 0xffffffff / 427 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 428 /* 429 * We cannot deal currently with this size of disk 430 * due to fileid limitations (see msdosfs_getattr and 431 * msdosfs_readdir) 432 */ 433 error = EINVAL; 434 printf("mountmsdosfs(): disk too big, sorry\n"); 435 goto error_exit; 436 } 437 #endif /* !MSDOSFS_LARGE */ 438 439 if (pmp->pm_RootDirEnts == 0) { 440 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 441 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 442 || pmp->pm_Sectors 443 || pmp->pm_FATsecs 444 || getushort(b710->bpbFSVers)) { 445 error = EINVAL; 446 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 447 goto error_exit; 448 } 449 pmp->pm_fatmask = FAT32_MASK; 450 pmp->pm_fatmult = 4; 451 pmp->pm_fatdiv = 1; 452 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 453 if (getushort(b710->bpbExtFlags) & FATMIRROR) 454 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 455 else 456 pmp->pm_flags |= MSDOSFS_FATMIRROR; 457 } else 458 pmp->pm_flags |= MSDOSFS_FATMIRROR; 459 460 /* 461 * Check a few values (could do some more): 462 * - logical sector size: power of 2, >= block size 463 * - sectors per cluster: power of 2, >= 1 464 * - number of sectors: >= 1, <= size of partition 465 * - number of FAT sectors: >= 1 466 */ 467 if ( (SecPerClust == 0) 468 || (SecPerClust & (SecPerClust - 1)) 469 || (pmp->pm_BytesPerSec < DEV_BSIZE) 470 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 471 || (pmp->pm_HugeSectors == 0) 472 || (pmp->pm_FATsecs == 0) 473 ) { 474 error = EINVAL; 475 goto error_exit; 476 } 477 478 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 479 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 480 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 481 SecPerClust *= pmp->pm_BlkPerSec; 482 483 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 484 485 if (FAT32(pmp)) { 486 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 487 pmp->pm_firstcluster = pmp->pm_fatblk 488 + (pmp->pm_FATs * pmp->pm_FATsecs); 489 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 490 } else { 491 pmp->pm_rootdirblk = pmp->pm_fatblk + 492 (pmp->pm_FATs * pmp->pm_FATsecs); 493 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 494 + DEV_BSIZE - 1) 495 / DEV_BSIZE; /* in blocks */ 496 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 497 } 498 499 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 500 SecPerClust + 1; 501 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 502 503 if (pmp->pm_fatmask == 0) { 504 if (pmp->pm_maxcluster 505 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 506 /* 507 * This will usually be a floppy disk. This size makes 508 * sure that one fat entry will not be split across 509 * multiple blocks. 510 */ 511 pmp->pm_fatmask = FAT12_MASK; 512 pmp->pm_fatmult = 3; 513 pmp->pm_fatdiv = 2; 514 } else { 515 pmp->pm_fatmask = FAT16_MASK; 516 pmp->pm_fatmult = 2; 517 pmp->pm_fatdiv = 1; 518 } 519 } 520 521 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 522 if (pmp->pm_maxcluster >= clusters) { 523 printf("Warning: number of clusters (%ld) exceeds FAT " 524 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 525 pmp->pm_maxcluster = clusters - 1; 526 } 527 528 529 if (FAT12(pmp)) 530 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 531 else 532 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 533 534 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 535 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 536 537 /* 538 * Compute mask and shift value for isolating cluster relative byte 539 * offsets and cluster numbers from a file offset. 540 */ 541 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 542 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 543 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 544 545 /* 546 * Check for valid cluster size 547 * must be a power of 2 548 */ 549 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 550 error = EINVAL; 551 goto error_exit; 552 } 553 554 /* 555 * Release the bootsector buffer. 556 */ 557 brelse(bp); 558 bp = NULL; 559 560 /* 561 * Check FSInfo. 562 */ 563 if (pmp->pm_fsinfo) { 564 struct fsinfo *fp; 565 566 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 567 NOCRED, &bp)) != 0) 568 goto error_exit; 569 fp = (struct fsinfo *)bp->b_data; 570 if (!bcmp(fp->fsisig1, "RRaA", 4) 571 && !bcmp(fp->fsisig2, "rrAa", 4) 572 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 573 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 574 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 575 if (pmp->pm_nxtfree == 0xffffffff) 576 pmp->pm_nxtfree = CLUST_FIRST; 577 } else 578 pmp->pm_fsinfo = 0; 579 brelse(bp); 580 bp = NULL; 581 } 582 583 /* 584 * Check and validate (or perhaps invalidate?) the fsinfo structure? 585 */ 586 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 587 printf( 588 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 589 pmp->pm_nxtfree, pmp->pm_maxcluster); 590 error = EINVAL; 591 goto error_exit; 592 } 593 594 /* 595 * Allocate memory for the bitmap of allocated clusters, and then 596 * fill it in. 597 */ 598 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 599 * sizeof(*pmp->pm_inusemap), 600 M_MSDOSFSFAT, M_WAITOK); 601 602 /* 603 * fillinusemap() needs pm_devvp. 604 */ 605 pmp->pm_dev = dev; 606 pmp->pm_devvp = devvp; 607 608 /* 609 * Have the inuse map filled in. 610 */ 611 if ((error = fillinusemap(pmp)) != 0) 612 goto error_exit; 613 614 /* 615 * If they want fat updates to be synchronous then let them suffer 616 * the performance degradation in exchange for the on disk copy of 617 * the fat being correct just about all the time. I suppose this 618 * would be a good thing to turn on if the kernel is still flakey. 619 */ 620 if (mp->mnt_flag & MNT_SYNCHRONOUS) 621 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 622 623 /* 624 * Finish up. 625 */ 626 if (ronly) 627 pmp->pm_flags |= MSDOSFSMNT_RONLY; 628 else { 629 /* Mark the volume dirty while it is mounted read/write. */ 630 if ((error = markvoldirty(pmp, 1)) != 0) 631 goto error_exit; 632 pmp->pm_fmod = 1; 633 } 634 mp->mnt_data = (qaddr_t) pmp; 635 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 636 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 637 mp->mnt_flag |= MNT_LOCAL; 638 devvp->v_rdev->si_mountpoint = mp; 639 640 #ifdef MSDOSFS_LARGE 641 msdosfs_fileno_init(mp); 642 #endif 643 644 return 0; 645 646 error_exit: 647 if (bp) 648 brelse(bp); 649 /* XXX: see comment above VOP_OPEN. */ 650 #ifdef notyet 651 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, td); 652 #else 653 (void)VOP_CLOSE(devvp, FREAD | FWRITE, NOCRED, td); 654 #endif 655 if (pmp) { 656 if (pmp->pm_inusemap) 657 free(pmp->pm_inusemap, M_MSDOSFSFAT); 658 free(pmp, M_MSDOSFSMNT); 659 mp->mnt_data = (qaddr_t)0; 660 } 661 return (error); 662 } 663 664 /* 665 * Unmount the filesystem described by mp. 666 */ 667 static int 668 msdosfs_unmount(mp, mntflags, td) 669 struct mount *mp; 670 int mntflags; 671 struct thread *td; 672 { 673 struct msdosfsmount *pmp; 674 int error, flags; 675 676 flags = 0; 677 if (mntflags & MNT_FORCE) 678 flags |= FORCECLOSE; 679 error = vflush(mp, 0, flags, td); 680 if (error) 681 return error; 682 pmp = VFSTOMSDOSFS(mp); 683 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 684 if (pmp->pm_w2u) 685 msdosfs_iconv->close(pmp->pm_w2u); 686 if (pmp->pm_u2w) 687 msdosfs_iconv->close(pmp->pm_u2w); 688 if (pmp->pm_d2u) 689 msdosfs_iconv->close(pmp->pm_d2u); 690 if (pmp->pm_u2d) 691 msdosfs_iconv->close(pmp->pm_u2d); 692 } 693 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 694 695 /* If the volume was mounted read/write, mark it clean now. */ 696 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 697 error = markvoldirty(pmp, 0); 698 if (error && (flags & FORCECLOSE) == 0) 699 return (error); 700 } 701 #ifdef MSDOSFS_DEBUG 702 { 703 struct vnode *vp = pmp->pm_devvp; 704 705 VI_LOCK(vp); 706 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 707 printf("iflag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 708 vp->vi_flag, vp->v_usecount, vp->v_writecount, 709 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), vp->v_freelist.tqe_prev, 714 vp->v_mount); 715 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 716 TAILQ_FIRST(&vp->v_cleanblkhd), 717 TAILQ_FIRST(&vp->v_dirtyblkhd), 718 vp->v_numoutput, vp->v_type); 719 printf("union %p, tag %s, 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 VI_UNLOCK(vp); 724 } 725 #endif 726 /* XXX: see comment above VOP_OPEN. */ 727 #ifdef notyet 728 error = VOP_CLOSE(pmp->pm_devvp, 729 (pmp->pm_flags & MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 730 NOCRED, td); 731 #else 732 error = VOP_CLOSE(pmp->pm_devvp, FREAD | FWRITE, NOCRED, td); 733 #endif 734 vrele(pmp->pm_devvp); 735 free(pmp->pm_inusemap, M_MSDOSFSFAT); 736 #ifdef MSDOSFS_LARGE 737 msdosfs_fileno_free(mp); 738 #endif 739 free(pmp, M_MSDOSFSMNT); 740 mp->mnt_data = (qaddr_t)0; 741 mp->mnt_flag &= ~MNT_LOCAL; 742 return (error); 743 } 744 745 static int 746 msdosfs_root(mp, vpp, td) 747 struct mount *mp; 748 struct vnode **vpp; 749 struct thread *td; 750 { 751 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 752 struct denode *ndep; 753 int error; 754 755 #ifdef MSDOSFS_DEBUG 756 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 757 #endif 758 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 759 if (error) 760 return (error); 761 *vpp = DETOV(ndep); 762 return (0); 763 } 764 765 static int 766 msdosfs_statfs(mp, sbp, td) 767 struct mount *mp; 768 struct statfs *sbp; 769 struct thread *td; 770 { 771 struct msdosfsmount *pmp; 772 773 pmp = VFSTOMSDOSFS(mp); 774 sbp->f_bsize = pmp->pm_bpcluster; 775 sbp->f_iosize = pmp->pm_bpcluster; 776 sbp->f_blocks = pmp->pm_maxcluster + 1; 777 sbp->f_bfree = pmp->pm_freeclustercount; 778 sbp->f_bavail = pmp->pm_freeclustercount; 779 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 780 sbp->f_ffree = 0; /* what to put in here? */ 781 if (sbp != &mp->mnt_stat) { 782 sbp->f_type = mp->mnt_vfc->vfc_typenum; 783 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 784 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 785 } 786 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 787 return (0); 788 } 789 790 static int 791 msdosfs_sync(mp, waitfor, cred, td) 792 struct mount *mp; 793 int waitfor; 794 struct ucred *cred; 795 struct thread *td; 796 { 797 struct vnode *vp, *nvp; 798 struct denode *dep; 799 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 800 int error, allerror = 0; 801 802 /* 803 * If we ever switch to not updating all of the fats all the time, 804 * this would be the place to update them from the first one. 805 */ 806 if (pmp->pm_fmod != 0) { 807 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 808 panic("msdosfs_sync: rofs mod"); 809 else { 810 /* update fats here */ 811 } 812 } 813 /* 814 * Write back each (modified) denode. 815 */ 816 MNT_ILOCK(mp); 817 loop: 818 MNT_VNODE_FOREACH(vp, mp, nvp) { 819 VI_LOCK(vp); 820 if (vp->v_iflag & VI_XLOCK) { 821 VI_UNLOCK(vp); 822 continue; 823 } 824 MNT_IUNLOCK(mp); 825 dep = VTODE(vp); 826 if (vp->v_type == VNON || 827 ((dep->de_flag & 828 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 829 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 830 VI_UNLOCK(vp); 831 MNT_ILOCK(mp); 832 continue; 833 } 834 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 835 if (error) { 836 MNT_ILOCK(mp); 837 if (error == ENOENT) 838 goto loop; 839 continue; 840 } 841 error = VOP_FSYNC(vp, cred, waitfor, td); 842 if (error) 843 allerror = error; 844 VOP_UNLOCK(vp, 0, td); 845 vrele(vp); 846 MNT_ILOCK(mp); 847 } 848 MNT_IUNLOCK(mp); 849 850 /* 851 * Flush filesystem control info. 852 */ 853 if (waitfor != MNT_LAZY) { 854 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 855 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, td); 856 if (error) 857 allerror = error; 858 VOP_UNLOCK(pmp->pm_devvp, 0, td); 859 } 860 return (allerror); 861 } 862 863 static int 864 msdosfs_fhtovp(mp, fhp, vpp) 865 struct mount *mp; 866 struct fid *fhp; 867 struct vnode **vpp; 868 { 869 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 870 struct defid *defhp = (struct defid *) fhp; 871 struct denode *dep; 872 int error; 873 874 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 875 if (error) { 876 *vpp = NULLVP; 877 return (error); 878 } 879 *vpp = DETOV(dep); 880 return (0); 881 } 882 883 static int 884 msdosfs_vptofh(vp, fhp) 885 struct vnode *vp; 886 struct fid *fhp; 887 { 888 struct denode *dep; 889 struct defid *defhp; 890 891 dep = VTODE(vp); 892 defhp = (struct defid *)fhp; 893 defhp->defid_len = sizeof(struct defid); 894 defhp->defid_dirclust = dep->de_dirclust; 895 defhp->defid_dirofs = dep->de_diroffset; 896 /* defhp->defid_gen = dep->de_gen; */ 897 return (0); 898 } 899 900 static struct vfsops msdosfs_vfsops = { 901 .vfs_fhtovp = msdosfs_fhtovp, 902 .vfs_init = msdosfs_init, 903 .vfs_omount = msdosfs_omount, 904 .vfs_root = msdosfs_root, 905 .vfs_statfs = msdosfs_statfs, 906 .vfs_sync = msdosfs_sync, 907 .vfs_uninit = msdosfs_uninit, 908 .vfs_unmount = msdosfs_unmount, 909 .vfs_vptofh = msdosfs_vptofh, 910 }; 911 912 VFS_SET(msdosfs_vfsops, msdosfs, 0); 913 MODULE_VERSION(msdosfs, 1); 914