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 /* $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/proc.h> 55 #include <sys/nlookup.h> 56 #include <sys/kernel.h> 57 #include <sys/vnode.h> 58 #include <sys/iconv.h> 59 #include <sys/mount.h> 60 #include <sys/buf.h> 61 #include <sys/fcntl.h> 62 #include <sys/malloc.h> 63 #include <sys/stat.h> /* defines ALLPERMS */ 64 #include <vm/vm_zone.h> 65 66 #include <sys/buf2.h> 67 68 #include "bpb.h" 69 #include "bootsect.h" 70 #include "direntry.h" 71 #include "denode.h" 72 #include "msdosfsmount.h" 73 #include "fat.h" 74 75 extern struct vop_ops msdosfs_vnode_vops; 76 struct iconv_functions *msdos_iconv; 77 78 #define MSDOSFS_DFLTBSIZE 4096 79 #define ENCODING_UNICODE "UTF-16BE" 80 #if 1 /*def PC98*/ 81 /* 82 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 83 * garbage or a random value :-{ 84 * If you want to use that broken-signatured media, define the 85 * following symbol even though PC/AT. 86 * (ex. mount PC-98 DOS formatted FD on PC/AT) 87 */ 88 #define MSDOSFS_NOCHECKSIG 89 #endif 90 91 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 92 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 93 94 static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 95 struct msdosfs_args *argp); 96 static int msdosfs_root(struct mount *, struct vnode **); 97 static int msdosfs_statfs(struct mount *, struct statfs *, struct ucred *); 98 static int msdosfs_unmount(struct mount *, int); 99 100 static int 101 update_mp(struct mount *mp, struct msdosfs_args *argp) 102 { 103 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 104 int error; 105 char cs_local[ICONV_CSNMAXLEN]; 106 char cs_dos[ICONV_CSNMAXLEN]; 107 108 pmp->pm_gid = argp->gid; 109 pmp->pm_uid = argp->uid; 110 pmp->pm_mask = argp->mask & ALLPERMS; 111 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 112 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) { 113 bcopy(argp->cs_local, cs_local, sizeof(cs_local)); 114 bcopy(argp->cs_dos, cs_dos, sizeof(cs_dos)); 115 kprintf("local: %s dos: %s\n",argp->cs_local, argp->cs_dos); 116 error = msdos_iconv->open(cs_local, ENCODING_UNICODE, 117 &pmp->pm_w2u); 118 if(error) 119 return error; 120 error = msdos_iconv->open(ENCODING_UNICODE, cs_local, 121 &pmp->pm_u2w); 122 if(error) 123 return error; 124 error = msdos_iconv->open(cs_dos, cs_local, &pmp->pm_u2d); 125 if(error) 126 return error; 127 error = msdos_iconv->open(cs_local, cs_dos, &pmp->pm_d2u); 128 if(error) 129 return error; 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 /* 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 struct vnode *rootvp; 143 if ((error = msdosfs_root(mp, &rootvp)) != 0) 144 return error; 145 pmp->pm_flags |= findwin95(VTODE(rootvp)) 146 ? MSDOSFSMNT_LONGNAME : 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 */ 158 static int 159 msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 160 { 161 struct vnode *devvp; /* vnode for blk device to mount */ 162 struct msdosfs_args args; /* will hold data from mount request */ 163 /* msdosfs specific mount control block */ 164 struct msdosfsmount *pmp = NULL; 165 size_t size; 166 int error, flags; 167 mode_t accessmode; 168 struct nlookupdata nd; 169 170 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 171 if (error) 172 return (error); 173 if (args.magic != MSDOSFS_ARGSMAGIC) 174 args.flags = 0; 175 /* 176 * If updating, check whether changing from read-only to 177 * read/write; if there is no device name, that's all we do. 178 */ 179 if (mp->mnt_flag & MNT_UPDATE) { 180 pmp = VFSTOMSDOSFS(mp); 181 error = 0; 182 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 183 (mp->mnt_flag & MNT_RDONLY)) { 184 flags = WRITECLOSE; 185 if (mp->mnt_flag & MNT_FORCE) 186 flags |= FORCECLOSE; 187 error = vflush(mp, 0, flags); 188 if (error == 0) { 189 devvp = pmp->pm_devvp; 190 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 191 VOP_OPEN(devvp, FREAD, FSCRED, NULL); 192 VOP_CLOSE(devvp, FREAD|FWRITE, NULL); 193 vn_unlock(devvp); 194 pmp->pm_flags |= MSDOSFSMNT_RONLY; 195 } 196 } 197 if (!error && (mp->mnt_flag & MNT_RELOAD)) 198 /* not yet implemented */ 199 error = EOPNOTSUPP; 200 if (error) 201 return (error); 202 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 203 (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 204 /* 205 * If upgrade to read-write by non-root, then verify 206 * that user has necessary permissions on the device. 207 */ 208 devvp = pmp->pm_devvp; 209 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 210 if (cred->cr_uid != 0) { 211 error = VOP_EACCESS(devvp, VREAD | VWRITE, 212 cred); 213 if (error) { 214 vn_unlock(devvp); 215 return (error); 216 } 217 } 218 VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL); 219 VOP_CLOSE(devvp, FREAD, NULL); 220 vn_unlock(devvp); 221 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 222 } 223 if (args.fspec == NULL) { 224 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 225 if (args.flags & MSDOSFSMNT_MNTOPT) { 226 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 227 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 228 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 229 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 230 } 231 #endif 232 /* 233 * Process export requests. 234 */ 235 return (vfs_export(mp, &pmp->pm_export, &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 block device. 241 */ 242 devvp = NULL; 243 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); 244 if (error == 0) 245 error = nlookup(&nd); 246 if (error == 0) 247 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 248 nlookup_done(&nd); 249 if (error) 250 return (error); 251 252 if (!vn_isdisk(devvp, &error)) { 253 vrele(devvp); 254 return (error); 255 } 256 /* 257 * If mount by non-root, then verify that user has necessary 258 * permissions on the device. 259 */ 260 if (cred->cr_uid != 0) { 261 accessmode = VREAD; 262 if ((mp->mnt_flag & MNT_RDONLY) == 0) 263 accessmode |= VWRITE; 264 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 265 error = VOP_EACCESS(devvp, accessmode, cred); 266 if (error) { 267 vput(devvp); 268 return (error); 269 } 270 vn_unlock(devvp); 271 } 272 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 273 error = mountmsdosfs(devvp, mp, &args); 274 #ifdef MSDOSFS_DEBUG /* only needed for the kprintf below */ 275 pmp = VFSTOMSDOSFS(mp); 276 #endif 277 } else { 278 if (devvp != pmp->pm_devvp) 279 error = EINVAL; /* XXX needs translation */ 280 else 281 vrele(devvp); 282 } 283 if (error) { 284 vrele(devvp); 285 return (error); 286 } 287 288 error = update_mp(mp, &args); 289 if (error) { 290 msdosfs_unmount(mp, MNT_FORCE); 291 return error; 292 } 293 294 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 295 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 296 msdosfs_statfs(mp, &mp->mnt_stat, cred); 297 #ifdef MSDOSFS_DEBUG 298 kprintf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", 299 mp, pmp, pmp->pm_inusemap); 300 #endif 301 return (0); 302 } 303 304 static int 305 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct msdosfs_args *argp) 306 { 307 struct msdosfsmount *pmp; 308 struct buf *bp; 309 cdev_t dev; 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 * Flush out any old buffers remaining from a previous use. 322 */ 323 error = vfs_mountedon(devvp); 324 if (error) 325 return (error); 326 if (vcount(devvp) > 0) 327 return (EBUSY); 328 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 329 error = vinvalbuf(devvp, V_SAVE, 0, 0); 330 vn_unlock(devvp); 331 if (error) 332 return (error); 333 334 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 335 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 336 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL); 337 vn_unlock(devvp); 338 if (error) 339 return (error); 340 dev = devvp->v_rdev; 341 bp = NULL; /* both used in error_exit */ 342 pmp = NULL; 343 344 /* 345 * Read the boot sector of the filesystem, and then check the 346 * boot signature. If not a dos boot sector then error out. 347 * 348 * NOTE: 2048 is a maximum sector size in current... 349 */ 350 error = bread(devvp, 0, 2048, &bp); 351 if (error) 352 goto error_exit; 353 bp->b_flags |= B_AGE; 354 bsp = (union bootsector *)bp->b_data; 355 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 356 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 357 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 358 359 #ifndef MSDOSFS_NOCHECKSIG 360 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 361 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 362 error = EINVAL; 363 goto error_exit; 364 } 365 #endif 366 367 pmp = kmalloc(sizeof(*pmp), M_MSDOSFSMNT, M_WAITOK | M_ZERO); 368 pmp->pm_mountp = mp; 369 370 /* 371 * Compute several useful quantities from the bpb in the 372 * bootsector. Copy in the dos 5 variant of the bpb then fix up 373 * the fields that are different between dos 5 and dos 3.3. 374 */ 375 SecPerClust = b50->bpbSecPerClust; 376 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 377 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 378 error = EINVAL; 379 goto error_exit; 380 } 381 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 382 pmp->pm_FATs = b50->bpbFATs; 383 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 384 pmp->pm_Sectors = getushort(b50->bpbSectors); 385 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 386 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 387 pmp->pm_Heads = getushort(b50->bpbHeads); 388 pmp->pm_Media = b50->bpbMedia; 389 390 /* calculate the ratio of sector size to DEV_BSIZE */ 391 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 392 393 /* 394 * We don't check pm_Heads nor pm_SecPerTrack, because 395 * these may not be set for EFI file systems. We don't 396 * use these anyway, so we're unaffected if they are 397 * invalid. 398 */ 399 if (!pmp->pm_BytesPerSec || !SecPerClust) { 400 error = EINVAL; 401 goto error_exit; 402 } 403 404 if (pmp->pm_Sectors == 0) { 405 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 406 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 407 } else { 408 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 409 pmp->pm_HugeSectors = pmp->pm_Sectors; 410 } 411 412 if (pmp->pm_RootDirEnts == 0) { 413 if (pmp->pm_Sectors 414 || pmp->pm_FATsecs 415 || getushort(b710->bpbFSVers)) { 416 error = EINVAL; 417 kprintf("mountmsdosfs(): bad FAT32 filesystem\n"); 418 goto error_exit; 419 } 420 pmp->pm_fatmask = FAT32_MASK; 421 pmp->pm_fatmult = 4; 422 pmp->pm_fatdiv = 1; 423 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 424 if (getushort(b710->bpbExtFlags) & FATMIRROR) 425 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 426 else 427 pmp->pm_flags |= MSDOSFS_FATMIRROR; 428 } else 429 pmp->pm_flags |= MSDOSFS_FATMIRROR; 430 431 /* 432 * Check a few values (could do some more): 433 * - logical sector size: power of 2, >= block size 434 * - sectors per cluster: power of 2, >= 1 435 * - number of sectors: >= 1, <= size of partition 436 * - number of FAT sectors: >= 1 437 */ 438 if ( (SecPerClust == 0) 439 || (SecPerClust & (SecPerClust - 1)) 440 || (pmp->pm_BytesPerSec < DEV_BSIZE) 441 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 442 || (pmp->pm_HugeSectors == 0) 443 || (pmp->pm_FATsecs == 0) 444 || (SecPerClust * pmp->pm_BlkPerSec > MAXBSIZE / DEV_BSIZE)) { 445 error = EINVAL; 446 goto error_exit; 447 } 448 449 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 450 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 451 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 452 SecPerClust *= pmp->pm_BlkPerSec; 453 454 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 455 456 if (FAT32(pmp)) { 457 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 458 pmp->pm_firstcluster = pmp->pm_fatblk 459 + (pmp->pm_FATs * pmp->pm_FATsecs); 460 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 461 } else { 462 pmp->pm_rootdirblk = pmp->pm_fatblk + 463 (pmp->pm_FATs * pmp->pm_FATsecs); 464 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * 465 sizeof(struct direntry) + DEV_BSIZE - 1) 466 / DEV_BSIZE; /* in blocks */ 467 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 468 } 469 470 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 471 SecPerClust + 1; 472 473 if (pmp->pm_fatmask == 0) { 474 if (pmp->pm_maxcluster 475 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 476 /* 477 * This will usually be a floppy disk. This size makes 478 * sure that one fat entry will not be split across 479 * multiple blocks. 480 */ 481 pmp->pm_fatmask = FAT12_MASK; 482 pmp->pm_fatmult = 3; 483 pmp->pm_fatdiv = 2; 484 } else { 485 pmp->pm_fatmask = FAT16_MASK; 486 pmp->pm_fatmult = 2; 487 pmp->pm_fatdiv = 1; 488 } 489 } 490 491 clusters = ((pmp->pm_FATsecs * DEV_BSIZE) / pmp->pm_fatmult) * 492 pmp->pm_fatdiv; 493 if (pmp->pm_maxcluster >= clusters) { 494 kprintf("Warning: number of clusters (%ld) exceeds FAT " 495 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 496 pmp->pm_maxcluster = clusters - 1; 497 } 498 499 if (FAT12(pmp)) 500 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 501 else 502 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 503 504 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 505 pmp->pm_bnshift = DEV_BSHIFT; 506 507 /* 508 * Compute mask and shift value for isolating cluster relative byte 509 * offsets and cluster numbers from a file offset. 510 */ 511 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 512 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 513 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 514 515 /* 516 * Check for valid cluster size 517 * must be a power of 2 518 */ 519 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 520 error = EINVAL; 521 goto error_exit; 522 } 523 524 /* 525 * Release the bootsector buffer. 526 */ 527 bp->b_flags |= B_RELBUF; 528 brelse(bp); 529 bp = NULL; 530 531 /* 532 * Check FSInfo. 533 */ 534 if (pmp->pm_fsinfo) { 535 struct fsinfo *fp; 536 537 if ((error = bread(devvp, de_bntodoff(pmp, pmp->pm_fsinfo), 538 fsi_size(pmp), &bp)) != 0) 539 goto error_exit; 540 fp = (struct fsinfo *)bp->b_data; 541 if (!bcmp(fp->fsisig1, "RRaA", 4) && 542 !bcmp(fp->fsisig2, "rrAa", 4) && 543 !bcmp(fp->fsisig3, "\0\0\125\252", 4) && 544 !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 545 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 546 if (pmp->pm_nxtfree == (u_long)-1) 547 pmp->pm_nxtfree = CLUST_FIRST; 548 if (pmp->pm_nxtfree == (u_int)-1) { 549 kprintf("msdosfs_mount(): " 550 "ignoring illegal nxtfree 0x%016jx\n", 551 (uintmax_t)pmp->pm_nxtfree); 552 pmp->pm_nxtfree = CLUST_FIRST; 553 } 554 } else 555 pmp->pm_fsinfo = 0; 556 bp->b_flags |= B_RELBUF; 557 brelse(bp); 558 bp = NULL; 559 } 560 561 /* 562 * Check and validate (or perhaps invalidate?) the fsinfo structure? 563 */ 564 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 565 kprintf( 566 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 567 pmp->pm_nxtfree, pmp->pm_maxcluster); 568 error = EINVAL; 569 goto error_exit; 570 } 571 572 /* 573 * Allocate memory for the bitmap of allocated clusters, and then 574 * fill it in. 575 */ 576 pmp->pm_inusemap = kmalloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 577 / N_INUSEBITS) * sizeof(*pmp->pm_inusemap), 578 M_MSDOSFSFAT, M_WAITOK); 579 580 /* 581 * fillinusemap() needs pm_devvp. 582 */ 583 pmp->pm_dev = dev; 584 pmp->pm_devvp = devvp; 585 586 /* 587 * Have the inuse map filled in. 588 */ 589 if ((error = fillinusemap(pmp)) != 0) 590 goto error_exit; 591 592 /* 593 * If they want fat updates to be synchronous then let them suffer 594 * the performance degradation in exchange for the on disk copy of 595 * the fat being correct just about all the time. I suppose this 596 * would be a good thing to turn on if the kernel is still flakey. 597 */ 598 if (mp->mnt_flag & MNT_SYNCHRONOUS) 599 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 600 601 /* 602 * Finish up. 603 */ 604 if (ronly) 605 pmp->pm_flags |= MSDOSFSMNT_RONLY; 606 else 607 pmp->pm_fmod = 1; 608 mp->mnt_data = (qaddr_t) pmp; 609 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 610 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 611 mp->mnt_flag |= MNT_LOCAL; 612 vfs_add_vnodeops(mp, &msdosfs_vnode_vops, &mp->mnt_vn_norm_ops); 613 dev->si_mountpoint = mp; 614 615 return 0; 616 617 error_exit: 618 if (bp) { 619 bp->b_flags |= B_RELBUF; 620 brelse(bp); 621 } 622 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 623 VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NULL); 624 vn_unlock(devvp); 625 if (pmp) { 626 if (pmp->pm_inusemap) 627 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 628 kfree(pmp, M_MSDOSFSMNT); 629 mp->mnt_data = (qaddr_t)0; 630 } 631 return (error); 632 } 633 634 /* 635 * Unmount the filesystem described by mp. 636 */ 637 static int 638 msdosfs_unmount(struct mount *mp, int mntflags) 639 { 640 struct msdosfsmount *pmp; 641 int error, flags; 642 #ifdef MSDOSFS_DEBUG 643 struct vnode *vp; 644 #endif 645 flags = 0; 646 if (mntflags & MNT_FORCE) 647 flags |= FORCECLOSE; 648 error = vflush(mp, 0, flags); 649 if (error) 650 return error; 651 pmp = VFSTOMSDOSFS(mp); 652 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 653 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) { 654 if(pmp->pm_w2u) 655 msdos_iconv->close(pmp->pm_w2u); 656 if(pmp->pm_u2w) 657 msdos_iconv->close(pmp->pm_u2w); 658 if(pmp->pm_d2u) 659 msdos_iconv->close(pmp->pm_d2u); 660 if(pmp->pm_u2d) 661 msdos_iconv->close(pmp->pm_u2d); 662 } 663 664 #ifdef MSDOSFS_DEBUG 665 vp = pmp->pm_devvp; 666 kprintf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 667 kprintf("flag %08x, refcnt 0x%08x, writecount %d, auxrefs 0x%08x\n", 668 vp->v_flag, vp->v_refcnt, vp->v_writecount, vp->v_auxrefs); 669 kprintf("mount %p, op %p\n", vp->v_mount, vp->v_ops); 670 kprintf("mount %p\n", vp->v_mount); 671 kprintf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 672 RB_ROOT(&vp->v_rbclean_tree), RB_ROOT(&vp->v_rbdirty_tree), 673 bio_track_active(&vp->v_track_write), vp->v_type); 674 kprintf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 675 vp->v_socket, vp->v_tag, ((u_int *)vp->v_data)[0], 676 ((u_int *)vp->v_data)[1]); 677 #endif 678 679 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 680 error = VOP_CLOSE(pmp->pm_devvp, 681 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 682 NULL); 683 vn_unlock(pmp->pm_devvp); 684 vrele(pmp->pm_devvp); 685 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 686 kfree(pmp, M_MSDOSFSMNT); 687 mp->mnt_data = (qaddr_t)0; 688 mp->mnt_flag &= ~MNT_LOCAL; 689 return (error); 690 } 691 692 static int 693 msdosfs_root(struct mount *mp, struct vnode **vpp) 694 { 695 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 696 struct denode *ndep; 697 int error; 698 699 mprintf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 700 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 701 if (error) 702 return (error); 703 *vpp = DETOV(ndep); 704 return (0); 705 } 706 707 static int 708 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 709 { 710 struct msdosfsmount *pmp; 711 712 pmp = VFSTOMSDOSFS(mp); 713 sbp->f_bsize = pmp->pm_bpcluster; 714 sbp->f_iosize = pmp->pm_bpcluster; 715 sbp->f_blocks = pmp->pm_maxcluster + 1; 716 sbp->f_bfree = pmp->pm_freeclustercount; 717 sbp->f_bavail = pmp->pm_freeclustercount; 718 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 719 sbp->f_ffree = 0; /* what to put in here? */ 720 if (sbp != &mp->mnt_stat) { 721 sbp->f_type = mp->mnt_vfc->vfc_typenum; 722 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 723 } 724 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 725 return (0); 726 } 727 728 struct scaninfo { 729 int rescan; 730 int allerror; 731 int waitfor; 732 }; 733 734 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data); 735 736 static int 737 msdosfs_sync(struct mount *mp, int waitfor) 738 { 739 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 740 struct scaninfo scaninfo; 741 int error; 742 743 /* 744 * If we ever switch to not updating all of the fats all the time, 745 * this would be the place to update them from the first one. 746 */ 747 if (pmp->pm_fmod != 0) { 748 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 749 panic("msdosfs_sync: rofs mod"); 750 else { 751 /* update fats here */ 752 } 753 } 754 /* 755 * Write back each (modified) denode. 756 */ 757 scaninfo.allerror = 0; 758 scaninfo.rescan = 1; 759 while (scaninfo.rescan) { 760 scaninfo.rescan = 0; 761 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, 762 msdosfs_sync_scan, &scaninfo); 763 } 764 765 /* 766 * Flush filesystem control info. 767 */ 768 if ((waitfor & MNT_LAZY) == 0) { 769 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 770 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, 0)) != 0) 771 scaninfo.allerror = error; 772 vn_unlock(pmp->pm_devvp); 773 } 774 return (scaninfo.allerror); 775 } 776 777 static int 778 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) 779 { 780 struct scaninfo *info = data; 781 struct denode *dep; 782 int error; 783 784 dep = VTODE(vp); 785 if (vp->v_type == VNON || vp->v_type == VBAD || 786 ((dep->de_flag & 787 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 788 (RB_EMPTY(&vp->v_rbdirty_tree) || (info->waitfor & MNT_LAZY)))) { 789 return(0); 790 } 791 if ((error = VOP_FSYNC(vp, info->waitfor, 0)) != 0) 792 info->allerror = error; 793 return(0); 794 } 795 796 static int 797 msdosfs_fhtovp(struct mount *mp, struct vnode *rootvp, 798 struct fid *fhp, struct vnode **vpp) 799 { 800 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 801 struct defid *defhp = (struct defid *) fhp; 802 struct denode *dep; 803 int error; 804 805 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 806 if (error) { 807 *vpp = NULLVP; 808 return (error); 809 } 810 *vpp = DETOV(dep); 811 return (0); 812 } 813 814 static int 815 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 816 struct ucred **credanonp) 817 { 818 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 819 struct netcred *np; 820 821 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 822 if (np == NULL) 823 return (EACCES); 824 *exflagsp = np->netc_exflags; 825 *credanonp = &np->netc_anon; 826 return (0); 827 } 828 829 static int 830 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 831 { 832 struct denode *dep; 833 struct defid *defhp; 834 835 dep = VTODE(vp); 836 defhp = (struct defid *)fhp; 837 defhp->defid_len = sizeof(struct defid); 838 defhp->defid_dirclust = dep->de_dirclust; 839 defhp->defid_dirofs = dep->de_diroffset; 840 /* defhp->defid_gen = dep->de_gen; */ 841 return (0); 842 } 843 844 static struct vfsops msdosfs_vfsops = { 845 .vfs_mount = msdosfs_mount, 846 .vfs_unmount = msdosfs_unmount, 847 .vfs_root = msdosfs_root, 848 .vfs_statfs = msdosfs_statfs, 849 .vfs_sync = msdosfs_sync, 850 .vfs_fhtovp = msdosfs_fhtovp, 851 .vfs_checkexp = msdosfs_checkexp, 852 .vfs_vptofh = msdosfs_vptofh, 853 .vfs_init = msdosfs_init, 854 .vfs_uninit = msdosfs_uninit 855 }; 856 857 VFS_SET(msdosfs_vfsops, msdos, 0); 858 MODULE_VERSION(msdos, 1); 859