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 bp->b_flags |= B_RELBUF; 526 brelse(bp); 527 bp = NULL; 528 529 /* 530 * Check FSInfo. 531 */ 532 if (pmp->pm_fsinfo) { 533 struct fsinfo *fp; 534 535 if ((error = bread(devvp, de_bntodoff(pmp, pmp->pm_fsinfo), fsi_size(pmp), &bp)) != 0) 536 goto error_exit; 537 fp = (struct fsinfo *)bp->b_data; 538 if (!bcmp(fp->fsisig1, "RRaA", 4) 539 && !bcmp(fp->fsisig2, "rrAa", 4) 540 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 541 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 542 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 543 if (pmp->pm_nxtfree == 0xffffffff) 544 pmp->pm_nxtfree = CLUST_FIRST; 545 } else 546 pmp->pm_fsinfo = 0; 547 bp->b_flags |= B_RELBUF; 548 brelse(bp); 549 bp = NULL; 550 } 551 552 /* 553 * Check and validate (or perhaps invalidate?) the fsinfo structure? 554 */ 555 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 556 kprintf( 557 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 558 pmp->pm_nxtfree, pmp->pm_maxcluster); 559 error = EINVAL; 560 goto error_exit; 561 } 562 563 /* 564 * Allocate memory for the bitmap of allocated clusters, and then 565 * fill it in. 566 */ 567 pmp->pm_inusemap = kmalloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 568 / N_INUSEBITS) 569 * sizeof(*pmp->pm_inusemap), 570 M_MSDOSFSFAT, M_WAITOK); 571 572 /* 573 * fillinusemap() needs pm_devvp. 574 */ 575 pmp->pm_dev = dev; 576 pmp->pm_devvp = devvp; 577 578 /* 579 * Have the inuse map filled in. 580 */ 581 if ((error = fillinusemap(pmp)) != 0) 582 goto error_exit; 583 584 /* 585 * If they want fat updates to be synchronous then let them suffer 586 * the performance degradation in exchange for the on disk copy of 587 * the fat being correct just about all the time. I suppose this 588 * would be a good thing to turn on if the kernel is still flakey. 589 */ 590 if (mp->mnt_flag & MNT_SYNCHRONOUS) 591 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 592 593 /* 594 * Finish up. 595 */ 596 if (ronly) 597 pmp->pm_flags |= MSDOSFSMNT_RONLY; 598 else 599 pmp->pm_fmod = 1; 600 mp->mnt_data = (qaddr_t) pmp; 601 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 602 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 603 mp->mnt_flag |= MNT_LOCAL; 604 vfs_add_vnodeops(mp, &msdosfs_vnode_vops, &mp->mnt_vn_norm_ops); 605 dev->si_mountpoint = mp; 606 607 return 0; 608 609 error_exit: 610 if (bp) { 611 bp->b_flags |= B_RELBUF; 612 brelse(bp); 613 } 614 VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE); 615 if (pmp) { 616 if (pmp->pm_inusemap) 617 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 618 kfree(pmp, M_MSDOSFSMNT); 619 mp->mnt_data = (qaddr_t)0; 620 } 621 return (error); 622 } 623 624 /* 625 * Unmount the filesystem described by mp. 626 */ 627 static int 628 msdosfs_unmount(struct mount *mp, int mntflags) 629 { 630 struct msdosfsmount *pmp; 631 int error, flags; 632 633 flags = 0; 634 if (mntflags & MNT_FORCE) 635 flags |= FORCECLOSE; 636 error = vflush(mp, 0, flags); 637 if (error) 638 return error; 639 pmp = VFSTOMSDOSFS(mp); 640 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 641 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) { 642 if(pmp->pm_w2u) 643 msdos_iconv->close(pmp->pm_w2u); 644 if(pmp->pm_u2w) 645 msdos_iconv->close(pmp->pm_u2w); 646 if(pmp->pm_d2u) 647 msdos_iconv->close(pmp->pm_d2u); 648 if(pmp->pm_u2d) 649 msdos_iconv->close(pmp->pm_u2d); 650 } 651 #ifdef MSDOSFS_DEBUG 652 { 653 struct vnode *vp = pmp->pm_devvp; 654 655 kprintf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 656 kprintf("flag %08x, sysrefs %d, writecount %d, auxrefs %d\n", 657 vp->v_flag, vp->v_sysref.refcnt, 658 vp->v_writecount, vp->v_auxrefs); 659 kprintf("mount %p, op %p\n", vp->v_mount, vp->v_ops); 660 kprintf("mount %p\n", vp->v_mount); 661 kprintf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 662 RB_ROOT(&vp->v_rbclean_tree), 663 RB_ROOT(&vp->v_rbdirty_tree), 664 bio_track_active(&vp->v_track_write), 665 vp->v_type); 666 kprintf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 667 vp->v_socket, vp->v_tag, 668 ((u_int *)vp->v_data)[0], 669 ((u_int *)vp->v_data)[1]); 670 } 671 #endif 672 error = VOP_CLOSE(pmp->pm_devvp, 673 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE); 674 vrele(pmp->pm_devvp); 675 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 676 kfree(pmp, M_MSDOSFSMNT); 677 mp->mnt_data = (qaddr_t)0; 678 mp->mnt_flag &= ~MNT_LOCAL; 679 return (error); 680 } 681 682 static int 683 msdosfs_root(struct mount *mp, struct vnode **vpp) 684 { 685 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 686 struct denode *ndep; 687 int error; 688 689 #ifdef MSDOSFS_DEBUG 690 kprintf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 691 #endif 692 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 693 if (error) 694 return (error); 695 *vpp = DETOV(ndep); 696 return (0); 697 } 698 699 static int 700 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 701 { 702 struct msdosfsmount *pmp; 703 704 pmp = VFSTOMSDOSFS(mp); 705 sbp->f_bsize = pmp->pm_bpcluster; 706 sbp->f_iosize = pmp->pm_bpcluster; 707 sbp->f_blocks = pmp->pm_maxcluster + 1; 708 sbp->f_bfree = pmp->pm_freeclustercount; 709 sbp->f_bavail = pmp->pm_freeclustercount; 710 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 711 sbp->f_ffree = 0; /* what to put in here? */ 712 if (sbp != &mp->mnt_stat) { 713 sbp->f_type = mp->mnt_vfc->vfc_typenum; 714 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 715 } 716 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 717 return (0); 718 } 719 720 struct scaninfo { 721 int rescan; 722 int allerror; 723 int waitfor; 724 }; 725 726 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data); 727 728 static int 729 msdosfs_sync(struct mount *mp, int waitfor) 730 { 731 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 732 struct scaninfo scaninfo; 733 int error; 734 735 /* 736 * If we ever switch to not updating all of the fats all the time, 737 * this would be the place to update them from the first one. 738 */ 739 if (pmp->pm_fmod != 0) { 740 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 741 panic("msdosfs_sync: rofs mod"); 742 else { 743 /* update fats here */ 744 } 745 } 746 /* 747 * Write back each (modified) denode. 748 */ 749 scaninfo.allerror = 0; 750 scaninfo.rescan = 1; 751 while (scaninfo.rescan) { 752 scaninfo.rescan = 0; 753 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo); 754 } 755 756 /* 757 * Flush filesystem control info. 758 */ 759 if ((waitfor & MNT_LAZY) == 0) { 760 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 761 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, 0)) != 0) 762 scaninfo.allerror = error; 763 vn_unlock(pmp->pm_devvp); 764 } 765 return (scaninfo.allerror); 766 } 767 768 static int 769 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) 770 { 771 struct scaninfo *info = data; 772 struct denode *dep; 773 int error; 774 775 dep = VTODE(vp); 776 if (vp->v_type == VNON || vp->v_type == VBAD || 777 ((dep->de_flag & 778 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 779 (RB_EMPTY(&vp->v_rbdirty_tree) || (info->waitfor & MNT_LAZY)))) { 780 return(0); 781 } 782 if ((error = VOP_FSYNC(vp, info->waitfor, 0)) != 0) 783 info->allerror = error; 784 return(0); 785 } 786 787 static int 788 msdosfs_fhtovp(struct mount *mp, struct vnode *rootvp, 789 struct fid *fhp, struct vnode **vpp) 790 { 791 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 792 struct defid *defhp = (struct defid *) fhp; 793 struct denode *dep; 794 int error; 795 796 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 797 if (error) { 798 *vpp = NULLVP; 799 return (error); 800 } 801 *vpp = DETOV(dep); 802 return (0); 803 } 804 805 static int 806 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 807 struct ucred **credanonp) 808 { 809 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 810 struct netcred *np; 811 812 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 813 if (np == NULL) 814 return (EACCES); 815 *exflagsp = np->netc_exflags; 816 *credanonp = &np->netc_anon; 817 return (0); 818 } 819 820 static int 821 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 822 { 823 struct denode *dep; 824 struct defid *defhp; 825 826 dep = VTODE(vp); 827 defhp = (struct defid *)fhp; 828 defhp->defid_len = sizeof(struct defid); 829 defhp->defid_dirclust = dep->de_dirclust; 830 defhp->defid_dirofs = dep->de_diroffset; 831 /* defhp->defid_gen = dep->de_gen; */ 832 return (0); 833 } 834 835 static struct vfsops msdosfs_vfsops = { 836 .vfs_mount = msdosfs_mount, 837 .vfs_unmount = msdosfs_unmount, 838 .vfs_root = msdosfs_root, 839 .vfs_statfs = msdosfs_statfs, 840 .vfs_sync = msdosfs_sync, 841 .vfs_fhtovp = msdosfs_fhtovp, 842 .vfs_checkexp = msdosfs_checkexp, 843 .vfs_vptofh = msdosfs_vptofh, 844 .vfs_init = msdosfs_init, 845 .vfs_uninit = msdosfs_uninit 846 }; 847 848 VFS_SET(msdosfs_vfsops, msdos, 0); 849 MODULE_VERSION(msdos, 1); 850