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 1.52 2008/09/17 21:44:24 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/iconv.h> 60 #include <sys/mount.h> 61 #include <sys/buf.h> 62 #include <sys/fcntl.h> 63 #include <sys/malloc.h> 64 #include <sys/stat.h> /* defines ALLPERMS */ 65 #include <vm/vm_zone.h> 66 67 #include "bpb.h" 68 #include "bootsect.h" 69 #include "direntry.h" 70 #include "denode.h" 71 #include "msdosfsmount.h" 72 #include "fat.h" 73 74 extern struct vop_ops msdosfs_vnode_vops; 75 struct iconv_functions *msdos_iconv; 76 77 #define MSDOSFS_DFLTBSIZE 4096 78 #define ENCODING_UNICODE "UTF-16BE" 79 #if 1 /*def PC98*/ 80 /* 81 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 82 * garbage or a random value :-{ 83 * If you want to use that broken-signatured media, define the 84 * following symbol even though PC/AT. 85 * (ex. mount PC-98 DOS formatted FD on PC/AT) 86 */ 87 #define MSDOSFS_NOCHECKSIG 88 #endif 89 90 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 91 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 92 93 static int update_mp (struct mount *mp, struct msdosfs_args *argp); 94 static int mountmsdosfs (struct vnode *devvp, struct mount *mp, 95 struct msdosfs_args *argp); 96 static int msdosfs_fhtovp (struct mount *, struct vnode *, 97 struct fid *, struct vnode **); 98 static int msdosfs_checkexp (struct mount *, struct sockaddr *, 99 int *, struct ucred **); 100 static int msdosfs_mount (struct mount *, char *, caddr_t, 101 struct ucred *); 102 static int msdosfs_root (struct mount *, struct vnode **); 103 static int msdosfs_statfs (struct mount *, struct statfs *, 104 struct ucred *); 105 static int msdosfs_sync (struct mount *, int); 106 static int msdosfs_unmount (struct mount *, int); 107 static int msdosfs_vptofh (struct vnode *, struct fid *); 108 109 static int 110 update_mp(struct mount *mp, struct msdosfs_args *argp) 111 { 112 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 113 int error; 114 char cs_local[ICONV_CSNMAXLEN]; 115 char cs_dos[ICONV_CSNMAXLEN]; 116 117 pmp->pm_gid = argp->gid; 118 pmp->pm_uid = argp->uid; 119 pmp->pm_mask = argp->mask & ALLPERMS; 120 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 121 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) { 122 bcopy(argp->cs_local, cs_local, sizeof(cs_local)); 123 bcopy(argp->cs_dos, cs_dos, sizeof(cs_dos)); 124 kprintf("local: %s dos: %s\n",argp->cs_local, argp->cs_dos); 125 error = msdos_iconv->open(cs_local, ENCODING_UNICODE, &pmp->pm_w2u); 126 if(error) 127 return error; 128 error = msdos_iconv->open(ENCODING_UNICODE, cs_local, &pmp->pm_u2w); 129 if(error) 130 return error; 131 error = msdos_iconv->open(cs_dos, cs_local, &pmp->pm_u2d); 132 if(error) 133 return error; 134 error = msdos_iconv->open(cs_local, cs_dos, &pmp->pm_d2u); 135 if(error) 136 return error; 137 } 138 139 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 140 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 141 else if (!(pmp->pm_flags & 142 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 143 struct vnode *rootvp; 144 145 /* 146 * Try to divine whether to support Win'95 long filenames 147 */ 148 if (FAT32(pmp)) 149 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 150 else { 151 if ((error = msdosfs_root(mp, &rootvp)) != 0) 152 return error; 153 pmp->pm_flags |= findwin95(VTODE(rootvp)) 154 ? MSDOSFSMNT_LONGNAME 155 : MSDOSFSMNT_SHORTNAME; 156 vput(rootvp); 157 } 158 } 159 return 0; 160 } 161 162 /* 163 * mp - path - addr in user space of mount point (ie /usr or whatever) 164 * data - addr in user space of mount params including the name of the block 165 * special file to treat as a filesystem. 166 */ 167 static int 168 msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 169 { 170 struct vnode *devvp; /* vnode for blk device to mount */ 171 struct msdosfs_args args; /* will hold data from mount request */ 172 /* msdosfs specific mount control block */ 173 struct msdosfsmount *pmp = NULL; 174 size_t size; 175 int error, flags; 176 mode_t accessmode; 177 struct nlookupdata nd; 178 179 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 180 if (error) 181 return (error); 182 if (args.magic != MSDOSFS_ARGSMAGIC) 183 args.flags = 0; 184 /* 185 * If updating, check whether changing from read-only to 186 * read/write; if there is no device name, that's all we do. 187 */ 188 if (mp->mnt_flag & MNT_UPDATE) { 189 pmp = VFSTOMSDOSFS(mp); 190 error = 0; 191 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 192 flags = WRITECLOSE; 193 if (mp->mnt_flag & MNT_FORCE) 194 flags |= FORCECLOSE; 195 error = vflush(mp, 0, flags); 196 if (error == 0) { 197 devvp = pmp->pm_devvp; 198 VOP_OPEN(devvp, FREAD, FSCRED, NULL); 199 VOP_CLOSE(devvp, FREAD|FWRITE); 200 pmp->pm_flags |= MSDOSFSMNT_RONLY; 201 } 202 } 203 if (!error && (mp->mnt_flag & MNT_RELOAD)) 204 /* not yet implemented */ 205 error = EOPNOTSUPP; 206 if (error) 207 return (error); 208 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 209 /* 210 * If upgrade to read-write by non-root, then verify 211 * that user has necessary permissions on the device. 212 */ 213 devvp = pmp->pm_devvp; 214 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 215 if (cred->cr_uid != 0) { 216 error = VOP_EACCESS(devvp, VREAD | VWRITE, cred); 217 if (error) { 218 vn_unlock(devvp); 219 return (error); 220 } 221 } 222 VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL); 223 VOP_CLOSE(devvp, FREAD); 224 vn_unlock(devvp); 225 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 226 } 227 if (args.fspec == 0) { 228 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 229 if (args.flags & MSDOSFSMNT_MNTOPT) { 230 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 231 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 232 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 233 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 234 } 235 #endif 236 /* 237 * Process export requests. 238 */ 239 return (vfs_export(mp, &pmp->pm_export, &args.export)); 240 } 241 } 242 /* 243 * Not an update, or updating the name: look up the name 244 * and verify that it refers to a sensible block device. 245 */ 246 devvp = NULL; 247 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); 248 if (error == 0) 249 error = nlookup(&nd); 250 if (error == 0) 251 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 252 nlookup_done(&nd); 253 if (error) 254 return (error); 255 256 if (!vn_isdisk(devvp, &error)) { 257 vrele(devvp); 258 return (error); 259 } 260 /* 261 * If mount by non-root, then verify that user has necessary 262 * permissions on the device. 263 */ 264 if (cred->cr_uid != 0) { 265 accessmode = VREAD; 266 if ((mp->mnt_flag & MNT_RDONLY) == 0) 267 accessmode |= VWRITE; 268 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 269 error = VOP_EACCESS(devvp, accessmode, cred); 270 if (error) { 271 vput(devvp); 272 return (error); 273 } 274 vn_unlock(devvp); 275 } 276 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 277 error = mountmsdosfs(devvp, mp, &args); 278 #ifdef MSDOSFS_DEBUG /* only needed for the kprintf below */ 279 pmp = VFSTOMSDOSFS(mp); 280 #endif 281 } else { 282 if (devvp != pmp->pm_devvp) 283 error = EINVAL; /* XXX needs translation */ 284 else 285 vrele(devvp); 286 } 287 if (error) { 288 vrele(devvp); 289 return (error); 290 } 291 292 error = update_mp(mp, &args); 293 if (error) { 294 msdosfs_unmount(mp, MNT_FORCE); 295 return error; 296 } 297 298 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 299 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 300 msdosfs_statfs(mp, &mp->mnt_stat, cred); 301 #ifdef MSDOSFS_DEBUG 302 kprintf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 303 #endif 304 return (0); 305 } 306 307 static int 308 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct msdosfs_args *argp) 309 { 310 struct msdosfsmount *pmp; 311 struct buf *bp; 312 cdev_t dev; 313 union bootsector *bsp; 314 struct byte_bpb33 *b33; 315 struct byte_bpb50 *b50; 316 struct byte_bpb710 *b710; 317 u_int8_t SecPerClust; 318 u_long clusters; 319 int ronly, error; 320 321 /* 322 * Disallow multiple mounts of the same device. 323 * Disallow mounting of a device that is currently in use 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) > 0) 330 return (EBUSY); 331 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 332 error = vinvalbuf(devvp, V_SAVE, 0, 0); 333 vn_unlock(devvp); 334 if (error) 335 return (error); 336 337 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 338 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 339 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL); 340 vn_unlock(devvp); 341 if (error) 342 return (error); 343 dev = devvp->v_rdev; 344 bp = NULL; /* both used in error_exit */ 345 pmp = NULL; 346 347 /* 348 * Read the boot sector of the filesystem, and then check the 349 * boot signature. If not a dos boot sector then error out. 350 * 351 * NOTE: 2048 is a maximum sector size in current... 352 */ 353 error = bread(devvp, 0, 2048, &bp); 354 if (error) 355 goto error_exit; 356 bp->b_flags |= B_AGE; 357 bsp = (union bootsector *)bp->b_data; 358 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 359 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 360 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 361 362 #ifndef MSDOSFS_NOCHECKSIG 363 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 364 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 365 error = EINVAL; 366 goto error_exit; 367 } 368 #endif 369 370 pmp = kmalloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 371 pmp->pm_mountp = mp; 372 373 /* 374 * Compute several useful quantities from the bpb in the 375 * bootsector. Copy in the dos 5 variant of the bpb then fix up 376 * the fields that are different between dos 5 and dos 3.3. 377 */ 378 SecPerClust = b50->bpbSecPerClust; 379 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 380 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 381 pmp->pm_FATs = b50->bpbFATs; 382 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 383 pmp->pm_Sectors = getushort(b50->bpbSectors); 384 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 385 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 386 pmp->pm_Heads = getushort(b50->bpbHeads); 387 pmp->pm_Media = b50->bpbMedia; 388 389 /* calculate the ratio of sector size to DEV_BSIZE */ 390 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 391 392 /* 393 * We don't check pm_Heads nor pm_SecPerTrack, because 394 * these may not be set for EFI file systems. We don't 395 * use these anyway, so we're unaffected if they are 396 * invalid. 397 */ 398 if (!pmp->pm_BytesPerSec || !SecPerClust) { 399 error = EINVAL; 400 goto error_exit; 401 } 402 403 if (pmp->pm_Sectors == 0) { 404 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 405 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 406 } else { 407 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 408 pmp->pm_HugeSectors = pmp->pm_Sectors; 409 } 410 411 if (pmp->pm_RootDirEnts == 0) { 412 if (pmp->pm_Sectors 413 || pmp->pm_FATsecs 414 || getushort(b710->bpbFSVers)) { 415 error = EINVAL; 416 kprintf("mountmsdosfs(): bad FAT32 filesystem\n"); 417 goto error_exit; 418 } 419 pmp->pm_fatmask = FAT32_MASK; 420 pmp->pm_fatmult = 4; 421 pmp->pm_fatdiv = 1; 422 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 423 if (getushort(b710->bpbExtFlags) & FATMIRROR) 424 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 425 else 426 pmp->pm_flags |= MSDOSFS_FATMIRROR; 427 } else 428 pmp->pm_flags |= MSDOSFS_FATMIRROR; 429 430 /* 431 * Check a few values (could do some more): 432 * - logical sector size: power of 2, >= block size 433 * - sectors per cluster: power of 2, >= 1 434 * - number of sectors: >= 1, <= size of partition 435 */ 436 if ( (SecPerClust == 0) 437 || (SecPerClust & (SecPerClust - 1)) 438 || (pmp->pm_BytesPerSec < DEV_BSIZE) 439 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 440 || (pmp->pm_HugeSectors == 0) 441 ) { 442 error = EINVAL; 443 goto error_exit; 444 } 445 446 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 447 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 448 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 449 SecPerClust *= pmp->pm_BlkPerSec; 450 451 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 452 453 if (FAT32(pmp)) { 454 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 455 pmp->pm_firstcluster = pmp->pm_fatblk 456 + (pmp->pm_FATs * pmp->pm_FATsecs); 457 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 458 } else { 459 pmp->pm_rootdirblk = pmp->pm_fatblk + 460 (pmp->pm_FATs * pmp->pm_FATsecs); 461 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 462 + DEV_BSIZE - 1) 463 / DEV_BSIZE; /* in blocks */ 464 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 465 } 466 467 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 468 SecPerClust + 1; 469 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 470 471 if (pmp->pm_fatmask == 0) { 472 if (pmp->pm_maxcluster 473 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 474 /* 475 * This will usually be a floppy disk. This size makes 476 * sure that one fat entry will not be split across 477 * multiple blocks. 478 */ 479 pmp->pm_fatmask = FAT12_MASK; 480 pmp->pm_fatmult = 3; 481 pmp->pm_fatdiv = 2; 482 } else { 483 pmp->pm_fatmask = FAT16_MASK; 484 pmp->pm_fatmult = 2; 485 pmp->pm_fatdiv = 1; 486 } 487 } 488 489 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 490 if (pmp->pm_maxcluster >= clusters) { 491 kprintf("Warning: number of clusters (%ld) exceeds FAT " 492 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 493 pmp->pm_maxcluster = clusters - 1; 494 } 495 496 497 if (FAT12(pmp)) 498 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 499 else 500 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 501 502 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 503 pmp->pm_bnshift = DEV_BSHIFT; 504 505 /* 506 * Compute mask and shift value for isolating cluster relative byte 507 * offsets and cluster numbers from a file offset. 508 */ 509 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 510 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 511 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 512 513 /* 514 * Check for valid cluster size 515 * must be a power of 2 516 */ 517 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 518 error = EINVAL; 519 goto error_exit; 520 } 521 522 /* 523 * Release the bootsector buffer. 524 */ 525 brelse(bp); 526 bp = NULL; 527 528 /* 529 * Check FSInfo. 530 */ 531 if (pmp->pm_fsinfo) { 532 struct fsinfo *fp; 533 534 if ((error = bread(devvp, de_bntodoff(pmp, pmp->pm_fsinfo), fsi_size(pmp), &bp)) != 0) 535 goto error_exit; 536 fp = (struct fsinfo *)bp->b_data; 537 if (!bcmp(fp->fsisig1, "RRaA", 4) 538 && !bcmp(fp->fsisig2, "rrAa", 4) 539 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 540 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 541 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 542 if (pmp->pm_nxtfree == 0xffffffff) 543 pmp->pm_nxtfree = CLUST_FIRST; 544 } else 545 pmp->pm_fsinfo = 0; 546 brelse(bp); 547 bp = NULL; 548 } 549 550 /* 551 * Check and validate (or perhaps invalidate?) the fsinfo structure? 552 */ 553 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 554 kprintf( 555 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 556 pmp->pm_nxtfree, pmp->pm_maxcluster); 557 error = EINVAL; 558 goto error_exit; 559 } 560 561 /* 562 * Allocate memory for the bitmap of allocated clusters, and then 563 * fill it in. 564 */ 565 pmp->pm_inusemap = kmalloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 566 / N_INUSEBITS) 567 * sizeof(*pmp->pm_inusemap), 568 M_MSDOSFSFAT, M_WAITOK); 569 570 /* 571 * fillinusemap() needs pm_devvp. 572 */ 573 pmp->pm_dev = dev; 574 pmp->pm_devvp = devvp; 575 576 /* 577 * Have the inuse map filled in. 578 */ 579 if ((error = fillinusemap(pmp)) != 0) 580 goto error_exit; 581 582 /* 583 * If they want fat updates to be synchronous then let them suffer 584 * the performance degradation in exchange for the on disk copy of 585 * the fat being correct just about all the time. I suppose this 586 * would be a good thing to turn on if the kernel is still flakey. 587 */ 588 if (mp->mnt_flag & MNT_SYNCHRONOUS) 589 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 590 591 /* 592 * Finish up. 593 */ 594 if (ronly) 595 pmp->pm_flags |= MSDOSFSMNT_RONLY; 596 else 597 pmp->pm_fmod = 1; 598 mp->mnt_data = (qaddr_t) pmp; 599 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 600 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 601 mp->mnt_flag |= MNT_LOCAL; 602 vfs_add_vnodeops(mp, &msdosfs_vnode_vops, &mp->mnt_vn_norm_ops); 603 dev->si_mountpoint = mp; 604 605 return 0; 606 607 error_exit: 608 if (bp) 609 brelse(bp); 610 VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE); 611 if (pmp) { 612 if (pmp->pm_inusemap) 613 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 614 kfree(pmp, M_MSDOSFSMNT); 615 mp->mnt_data = (qaddr_t)0; 616 } 617 return (error); 618 } 619 620 /* 621 * Unmount the filesystem described by mp. 622 */ 623 static int 624 msdosfs_unmount(struct mount *mp, int mntflags) 625 { 626 struct msdosfsmount *pmp; 627 int error, flags; 628 629 flags = 0; 630 if (mntflags & MNT_FORCE) 631 flags |= FORCECLOSE; 632 error = vflush(mp, 0, flags); 633 if (error) 634 return error; 635 pmp = VFSTOMSDOSFS(mp); 636 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 637 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) { 638 if(pmp->pm_w2u) 639 msdos_iconv->close(pmp->pm_w2u); 640 if(pmp->pm_u2w) 641 msdos_iconv->close(pmp->pm_u2w); 642 if(pmp->pm_d2u) 643 msdos_iconv->close(pmp->pm_d2u); 644 if(pmp->pm_u2d) 645 msdos_iconv->close(pmp->pm_u2d); 646 } 647 #ifdef MSDOSFS_DEBUG 648 { 649 struct vnode *vp = pmp->pm_devvp; 650 651 kprintf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 652 kprintf("flag %08x, sysrefs %d, writecount %d, auxrefs %d\n", 653 vp->v_flag, vp->v_sysref.refcnt, 654 vp->v_writecount, vp->v_auxrefs); 655 kprintf("mount %p, op %p\n", vp->v_mount, vp->v_ops); 656 kprintf("mount %p\n", vp->v_mount); 657 kprintf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 658 RB_ROOT(&vp->v_rbclean_tree), 659 RB_ROOT(&vp->v_rbdirty_tree), 660 bio_track_active(&vp->v_track_write), 661 vp->v_type); 662 kprintf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 663 vp->v_socket, vp->v_tag, 664 ((u_int *)vp->v_data)[0], 665 ((u_int *)vp->v_data)[1]); 666 } 667 #endif 668 error = VOP_CLOSE(pmp->pm_devvp, 669 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE); 670 vrele(pmp->pm_devvp); 671 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 672 kfree(pmp, M_MSDOSFSMNT); 673 mp->mnt_data = (qaddr_t)0; 674 mp->mnt_flag &= ~MNT_LOCAL; 675 return (error); 676 } 677 678 static int 679 msdosfs_root(struct mount *mp, struct vnode **vpp) 680 { 681 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 682 struct denode *ndep; 683 int error; 684 685 #ifdef MSDOSFS_DEBUG 686 kprintf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 687 #endif 688 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 689 if (error) 690 return (error); 691 *vpp = DETOV(ndep); 692 return (0); 693 } 694 695 static int 696 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 697 { 698 struct msdosfsmount *pmp; 699 700 pmp = VFSTOMSDOSFS(mp); 701 sbp->f_bsize = pmp->pm_bpcluster; 702 sbp->f_iosize = pmp->pm_bpcluster; 703 sbp->f_blocks = pmp->pm_maxcluster + 1; 704 sbp->f_bfree = pmp->pm_freeclustercount; 705 sbp->f_bavail = pmp->pm_freeclustercount; 706 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 707 sbp->f_ffree = 0; /* what to put in here? */ 708 if (sbp != &mp->mnt_stat) { 709 sbp->f_type = mp->mnt_vfc->vfc_typenum; 710 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 711 } 712 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 713 return (0); 714 } 715 716 struct scaninfo { 717 int rescan; 718 int allerror; 719 int waitfor; 720 }; 721 722 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data); 723 724 static int 725 msdosfs_sync(struct mount *mp, int waitfor) 726 { 727 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 728 struct scaninfo scaninfo; 729 int error; 730 731 /* 732 * If we ever switch to not updating all of the fats all the time, 733 * this would be the place to update them from the first one. 734 */ 735 if (pmp->pm_fmod != 0) { 736 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 737 panic("msdosfs_sync: rofs mod"); 738 else { 739 /* update fats here */ 740 } 741 } 742 /* 743 * Write back each (modified) denode. 744 */ 745 scaninfo.allerror = 0; 746 scaninfo.rescan = 1; 747 while (scaninfo.rescan) { 748 scaninfo.rescan = 0; 749 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo); 750 } 751 752 /* 753 * Flush filesystem control info. 754 */ 755 if (waitfor != MNT_LAZY) { 756 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 757 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, 0)) != 0) 758 scaninfo.allerror = error; 759 vn_unlock(pmp->pm_devvp); 760 } 761 return (scaninfo.allerror); 762 } 763 764 static int 765 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) 766 { 767 struct scaninfo *info = data; 768 struct denode *dep; 769 int error; 770 771 dep = VTODE(vp); 772 if (vp->v_type == VNON || vp->v_type == VBAD || 773 ((dep->de_flag & 774 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 775 (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) { 776 return(0); 777 } 778 if ((error = VOP_FSYNC(vp, info->waitfor, 0)) != 0) 779 info->allerror = error; 780 return(0); 781 } 782 783 static int 784 msdosfs_fhtovp(struct mount *mp, struct vnode *rootvp, 785 struct fid *fhp, struct vnode **vpp) 786 { 787 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 788 struct defid *defhp = (struct defid *) fhp; 789 struct denode *dep; 790 int error; 791 792 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 793 if (error) { 794 *vpp = NULLVP; 795 return (error); 796 } 797 *vpp = DETOV(dep); 798 return (0); 799 } 800 801 static int 802 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 803 struct ucred **credanonp) 804 { 805 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 806 struct netcred *np; 807 808 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 809 if (np == NULL) 810 return (EACCES); 811 *exflagsp = np->netc_exflags; 812 *credanonp = &np->netc_anon; 813 return (0); 814 } 815 816 static int 817 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 818 { 819 struct denode *dep; 820 struct defid *defhp; 821 822 dep = VTODE(vp); 823 defhp = (struct defid *)fhp; 824 defhp->defid_len = sizeof(struct defid); 825 defhp->defid_dirclust = dep->de_dirclust; 826 defhp->defid_dirofs = dep->de_diroffset; 827 /* defhp->defid_gen = dep->de_gen; */ 828 return (0); 829 } 830 831 static struct vfsops msdosfs_vfsops = { 832 .vfs_mount = msdosfs_mount, 833 .vfs_unmount = msdosfs_unmount, 834 .vfs_root = msdosfs_root, 835 .vfs_statfs = msdosfs_statfs, 836 .vfs_sync = msdosfs_sync, 837 .vfs_fhtovp = msdosfs_fhtovp, 838 .vfs_checkexp = msdosfs_checkexp, 839 .vfs_vptofh = msdosfs_vptofh, 840 .vfs_init = msdosfs_init, 841 .vfs_uninit = msdosfs_uninit 842 }; 843 844 VFS_SET(msdosfs_vfsops, msdos, 0); 845 MODULE_VERSION(msdos, 1); 846