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 1.51 2008/05/20 19:14:38 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/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 "bpb.h" 67 #include "bootsect.h" 68 #include "direntry.h" 69 #include "denode.h" 70 #include "msdosfsmount.h" 71 #include "fat.h" 72 73 extern struct vop_ops msdosfs_vnode_vops; 74 75 #define MSDOSFS_DFLTBSIZE 4096 76 77 #if 1 /*def PC98*/ 78 /* 79 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 80 * garbage or a random value :-{ 81 * If you want to use that broken-signatured media, define the 82 * following symbol even though PC/AT. 83 * (ex. mount PC-98 DOS formatted FD on PC/AT) 84 */ 85 #define MSDOSFS_NOCHECKSIG 86 #endif 87 88 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 89 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 90 91 static int update_mp (struct mount *mp, struct msdosfs_args *argp); 92 static int mountmsdosfs (struct vnode *devvp, struct mount *mp, 93 struct msdosfs_args *argp); 94 static int msdosfs_fhtovp (struct mount *, struct fid *, 95 struct vnode **); 96 static int msdosfs_checkexp (struct mount *, struct sockaddr *, 97 int *, struct ucred **); 98 static int msdosfs_mount (struct mount *, char *, caddr_t, 99 struct ucred *); 100 static int msdosfs_root (struct mount *, struct vnode **); 101 static int msdosfs_statfs (struct mount *, struct statfs *, 102 struct ucred *); 103 static int msdosfs_sync (struct mount *, int); 104 static int msdosfs_unmount (struct mount *, int); 105 static int msdosfs_vptofh (struct vnode *, struct fid *); 106 107 static int 108 update_mp(struct mount *mp, struct msdosfs_args *argp) 109 { 110 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 111 int error; 112 113 pmp->pm_gid = argp->gid; 114 pmp->pm_uid = argp->uid; 115 pmp->pm_mask = argp->mask & ALLPERMS; 116 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 117 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 118 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 119 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 120 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 121 } 122 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 123 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 124 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 125 } 126 127 #ifndef __DragonFly__ 128 /* 129 * GEMDOS knows nothing (yet) about win95 130 */ 131 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 132 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 133 #endif 134 135 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 136 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 137 else if (!(pmp->pm_flags & 138 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 139 struct vnode *rootvp; 140 141 /* 142 * Try to divine whether to support Win'95 long filenames 143 */ 144 if (FAT32(pmp)) 145 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 146 else { 147 if ((error = msdosfs_root(mp, &rootvp)) != 0) 148 return error; 149 pmp->pm_flags |= findwin95(VTODE(rootvp)) 150 ? MSDOSFSMNT_LONGNAME 151 : MSDOSFSMNT_SHORTNAME; 152 vput(rootvp); 153 } 154 } 155 return 0; 156 } 157 158 /* 159 * mp - path - addr in user space of mount point (ie /usr or whatever) 160 * data - addr in user space of mount params including the name of the block 161 * special file to treat as a filesystem. 162 */ 163 static int 164 msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 165 { 166 struct vnode *devvp; /* vnode for blk device to mount */ 167 struct msdosfs_args args; /* will hold data from mount request */ 168 /* msdosfs specific mount control block */ 169 struct msdosfsmount *pmp = NULL; 170 size_t size; 171 int error, flags; 172 mode_t accessmode; 173 struct nlookupdata nd; 174 175 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 176 if (error) 177 return (error); 178 if (args.magic != MSDOSFS_ARGSMAGIC) 179 args.flags = 0; 180 /* 181 * If updating, check whether changing from read-only to 182 * read/write; if there is no device name, that's all we do. 183 */ 184 if (mp->mnt_flag & MNT_UPDATE) { 185 pmp = VFSTOMSDOSFS(mp); 186 error = 0; 187 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 188 flags = WRITECLOSE; 189 if (mp->mnt_flag & MNT_FORCE) 190 flags |= FORCECLOSE; 191 error = vflush(mp, 0, flags); 192 if (error == 0) { 193 devvp = pmp->pm_devvp; 194 VOP_OPEN(devvp, FREAD, FSCRED, NULL); 195 VOP_CLOSE(devvp, FREAD|FWRITE); 196 pmp->pm_flags |= MSDOSFSMNT_RONLY; 197 } 198 } 199 if (!error && (mp->mnt_flag & MNT_RELOAD)) 200 /* not yet implemented */ 201 error = EOPNOTSUPP; 202 if (error) 203 return (error); 204 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 205 /* 206 * If upgrade to read-write by non-root, then verify 207 * that user has necessary permissions on the device. 208 */ 209 devvp = pmp->pm_devvp; 210 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 211 if (cred->cr_uid != 0) { 212 error = VOP_ACCESS(devvp, VREAD | VWRITE, 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); 220 vn_unlock(devvp); 221 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 222 } 223 if (args.fspec == 0) { 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_ACCESS(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", mp, pmp, pmp->pm_inusemap); 299 #endif 300 return (0); 301 } 302 303 static int 304 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct msdosfs_args *argp) 305 { 306 struct msdosfsmount *pmp; 307 struct buf *bp; 308 cdev_t dev; 309 union bootsector *bsp; 310 struct byte_bpb33 *b33; 311 struct byte_bpb50 *b50; 312 struct byte_bpb710 *b710; 313 u_int8_t SecPerClust; 314 u_long clusters; 315 int ronly, error; 316 317 /* 318 * Disallow multiple mounts of the same device. 319 * Disallow mounting of a device that is currently in use 320 * Flush out any old buffers remaining from a previous use. 321 */ 322 error = vfs_mountedon(devvp); 323 if (error) 324 return (error); 325 if (count_udev(devvp->v_umajor, devvp->v_uminor) > 0) 326 return (EBUSY); 327 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 328 error = vinvalbuf(devvp, V_SAVE, 0, 0); 329 vn_unlock(devvp); 330 if (error) 331 return (error); 332 333 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 334 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 335 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL); 336 vn_unlock(devvp); 337 if (error) 338 return (error); 339 dev = devvp->v_rdev; 340 bp = NULL; /* both used in error_exit */ 341 pmp = NULL; 342 343 /* 344 * Read the boot sector of the filesystem, and then check the 345 * boot signature. If not a dos boot sector then error out. 346 * 347 * NOTE: 2048 is a maximum sector size in current... 348 */ 349 error = bread(devvp, 0, 2048, &bp); 350 if (error) 351 goto error_exit; 352 bp->b_flags |= B_AGE; 353 bsp = (union bootsector *)bp->b_data; 354 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 355 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 356 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 357 358 #ifndef __DragonFly__ 359 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 360 #endif 361 #ifndef MSDOSFS_NOCHECKSIG 362 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 363 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 364 error = EINVAL; 365 goto error_exit; 366 } 367 #endif 368 #ifndef __DragonFly__ 369 } 370 #endif 371 372 pmp = kmalloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 373 pmp->pm_mountp = mp; 374 375 /* 376 * Compute several useful quantities from the bpb in the 377 * bootsector. Copy in the dos 5 variant of the bpb then fix up 378 * the fields that are different between dos 5 and dos 3.3. 379 */ 380 SecPerClust = b50->bpbSecPerClust; 381 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 382 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 383 pmp->pm_FATs = b50->bpbFATs; 384 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 385 pmp->pm_Sectors = getushort(b50->bpbSectors); 386 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 387 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 388 pmp->pm_Heads = getushort(b50->bpbHeads); 389 pmp->pm_Media = b50->bpbMedia; 390 391 /* calculate the ratio of sector size to DEV_BSIZE */ 392 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 393 394 #ifndef __DragonFly__ 395 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 396 #endif 397 /* XXX - We should probably check more values here */ 398 if (!pmp->pm_BytesPerSec || !SecPerClust 399 || !pmp->pm_Heads 400 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 401 error = EINVAL; 402 goto error_exit; 403 } 404 #ifndef __DragonFly__ 405 } 406 #endif 407 408 if (pmp->pm_Sectors == 0) { 409 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 410 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 411 } else { 412 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 413 pmp->pm_HugeSectors = pmp->pm_Sectors; 414 } 415 416 if (pmp->pm_RootDirEnts == 0) { 417 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 418 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 419 || pmp->pm_Sectors 420 || pmp->pm_FATsecs 421 || getushort(b710->bpbFSVers)) { 422 error = EINVAL; 423 kprintf("mountmsdosfs(): bad FAT32 filesystem\n"); 424 goto error_exit; 425 } 426 pmp->pm_fatmask = FAT32_MASK; 427 pmp->pm_fatmult = 4; 428 pmp->pm_fatdiv = 1; 429 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 430 if (getushort(b710->bpbExtFlags) & FATMIRROR) 431 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 432 else 433 pmp->pm_flags |= MSDOSFS_FATMIRROR; 434 } else 435 pmp->pm_flags |= MSDOSFS_FATMIRROR; 436 437 /* 438 * Check a few values (could do some more): 439 * - logical sector size: power of 2, >= block size 440 * - sectors per cluster: power of 2, >= 1 441 * - number of sectors: >= 1, <= size of partition 442 */ 443 if ( (SecPerClust == 0) 444 || (SecPerClust & (SecPerClust - 1)) 445 || (pmp->pm_BytesPerSec < DEV_BSIZE) 446 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 447 || (pmp->pm_HugeSectors == 0) 448 ) { 449 error = EINVAL; 450 goto error_exit; 451 } 452 453 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 454 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 455 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 456 SecPerClust *= pmp->pm_BlkPerSec; 457 458 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 459 460 if (FAT32(pmp)) { 461 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 462 pmp->pm_firstcluster = pmp->pm_fatblk 463 + (pmp->pm_FATs * pmp->pm_FATsecs); 464 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 465 } else { 466 pmp->pm_rootdirblk = pmp->pm_fatblk + 467 (pmp->pm_FATs * pmp->pm_FATsecs); 468 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 469 + DEV_BSIZE - 1) 470 / DEV_BSIZE; /* in blocks */ 471 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 472 } 473 474 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 475 SecPerClust + 1; 476 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 477 478 #ifndef __DragonFly__ 479 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 480 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 481 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 482 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 483 ) { 484 pmp->pm_fatmask = FAT12_MASK; 485 pmp->pm_fatmult = 3; 486 pmp->pm_fatdiv = 2; 487 } else { 488 pmp->pm_fatmask = FAT16_MASK; 489 pmp->pm_fatmult = 2; 490 pmp->pm_fatdiv = 1; 491 } 492 } else 493 #endif 494 if (pmp->pm_fatmask == 0) { 495 if (pmp->pm_maxcluster 496 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 497 /* 498 * This will usually be a floppy disk. This size makes 499 * sure that one fat entry will not be split across 500 * multiple blocks. 501 */ 502 pmp->pm_fatmask = FAT12_MASK; 503 pmp->pm_fatmult = 3; 504 pmp->pm_fatdiv = 2; 505 } else { 506 pmp->pm_fatmask = FAT16_MASK; 507 pmp->pm_fatmult = 2; 508 pmp->pm_fatdiv = 1; 509 } 510 } 511 512 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 513 if (pmp->pm_maxcluster >= clusters) { 514 kprintf("Warning: number of clusters (%ld) exceeds FAT " 515 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 516 pmp->pm_maxcluster = clusters - 1; 517 } 518 519 520 if (FAT12(pmp)) 521 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 522 else 523 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 524 525 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 526 pmp->pm_bnshift = DEV_BSHIFT; 527 528 /* 529 * Compute mask and shift value for isolating cluster relative byte 530 * offsets and cluster numbers from a file offset. 531 */ 532 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 533 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 534 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 535 536 /* 537 * Check for valid cluster size 538 * must be a power of 2 539 */ 540 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 541 error = EINVAL; 542 goto error_exit; 543 } 544 545 /* 546 * Release the bootsector buffer. 547 */ 548 brelse(bp); 549 bp = NULL; 550 551 /* 552 * Check FSInfo. 553 */ 554 if (pmp->pm_fsinfo) { 555 struct fsinfo *fp; 556 557 if ((error = bread(devvp, de_bntodoff(pmp, pmp->pm_fsinfo), fsi_size(pmp), &bp)) != 0) 558 goto error_exit; 559 fp = (struct fsinfo *)bp->b_data; 560 if (!bcmp(fp->fsisig1, "RRaA", 4) 561 && !bcmp(fp->fsisig2, "rrAa", 4) 562 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 563 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 564 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 565 if (pmp->pm_nxtfree == 0xffffffff) 566 pmp->pm_nxtfree = CLUST_FIRST; 567 } else 568 pmp->pm_fsinfo = 0; 569 brelse(bp); 570 bp = NULL; 571 } 572 573 /* 574 * Check and validate (or perhaps invalidate?) the fsinfo structure? 575 */ 576 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 577 kprintf( 578 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 579 pmp->pm_nxtfree, pmp->pm_maxcluster); 580 error = EINVAL; 581 goto error_exit; 582 } 583 584 /* 585 * Allocate memory for the bitmap of allocated clusters, and then 586 * fill it in. 587 */ 588 pmp->pm_inusemap = kmalloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 589 / N_INUSEBITS) 590 * sizeof(*pmp->pm_inusemap), 591 M_MSDOSFSFAT, M_WAITOK); 592 593 /* 594 * fillinusemap() needs pm_devvp. 595 */ 596 pmp->pm_dev = dev; 597 pmp->pm_devvp = devvp; 598 599 /* 600 * Have the inuse map filled in. 601 */ 602 if ((error = fillinusemap(pmp)) != 0) 603 goto error_exit; 604 605 /* 606 * If they want fat updates to be synchronous then let them suffer 607 * the performance degradation in exchange for the on disk copy of 608 * the fat being correct just about all the time. I suppose this 609 * would be a good thing to turn on if the kernel is still flakey. 610 */ 611 if (mp->mnt_flag & MNT_SYNCHRONOUS) 612 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 613 614 /* 615 * Finish up. 616 */ 617 if (ronly) 618 pmp->pm_flags |= MSDOSFSMNT_RONLY; 619 else 620 pmp->pm_fmod = 1; 621 mp->mnt_data = (qaddr_t) pmp; 622 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 623 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 624 mp->mnt_flag |= MNT_LOCAL; 625 vfs_add_vnodeops(mp, &msdosfs_vnode_vops, &mp->mnt_vn_norm_ops); 626 dev->si_mountpoint = mp; 627 628 return 0; 629 630 error_exit: 631 if (bp) 632 brelse(bp); 633 VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE); 634 if (pmp) { 635 if (pmp->pm_inusemap) 636 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 637 kfree(pmp, M_MSDOSFSMNT); 638 mp->mnt_data = (qaddr_t)0; 639 } 640 return (error); 641 } 642 643 /* 644 * Unmount the filesystem described by mp. 645 */ 646 static int 647 msdosfs_unmount(struct mount *mp, int mntflags) 648 { 649 struct msdosfsmount *pmp; 650 int error, flags; 651 652 flags = 0; 653 if (mntflags & MNT_FORCE) 654 flags |= FORCECLOSE; 655 error = vflush(mp, 0, flags); 656 if (error) 657 return error; 658 pmp = VFSTOMSDOSFS(mp); 659 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 660 #ifdef MSDOSFS_DEBUG 661 { 662 struct vnode *vp = pmp->pm_devvp; 663 664 kprintf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 665 kprintf("flag %08x, sysrefs %d, writecount %d, auxrefs %d\n", 666 vp->v_flag, vp->v_sysref.refcnt, 667 vp->v_writecount, vp->v_auxrefs); 668 kprintf("mount %p, op %p\n", vp->v_mount, vp->v_ops); 669 kprintf("mount %p\n", vp->v_mount); 670 kprintf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 671 RB_ROOT(&vp->v_rbclean_tree), 672 RB_ROOT(&vp->v_rbdirty_tree), 673 vp->v_track_write.bk_active, vp->v_type); 674 kprintf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 675 vp->v_socket, vp->v_tag, 676 ((u_int *)vp->v_data)[0], 677 ((u_int *)vp->v_data)[1]); 678 } 679 #endif 680 error = VOP_CLOSE(pmp->pm_devvp, 681 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE); 682 vrele(pmp->pm_devvp); 683 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 684 kfree(pmp, M_MSDOSFSMNT); 685 mp->mnt_data = (qaddr_t)0; 686 mp->mnt_flag &= ~MNT_LOCAL; 687 return (error); 688 } 689 690 static int 691 msdosfs_root(struct mount *mp, struct vnode **vpp) 692 { 693 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 694 struct denode *ndep; 695 int error; 696 697 #ifdef MSDOSFS_DEBUG 698 kprintf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 699 #endif 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, msdosfs_sync_scan, &scaninfo); 762 } 763 764 /* 765 * Flush filesystem control info. 766 */ 767 if (waitfor != MNT_LAZY) { 768 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 769 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor)) != 0) 770 scaninfo.allerror = error; 771 vn_unlock(pmp->pm_devvp); 772 } 773 return (scaninfo.allerror); 774 } 775 776 static int 777 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) 778 { 779 struct scaninfo *info = data; 780 struct denode *dep; 781 int error; 782 783 dep = VTODE(vp); 784 if (vp->v_type == VNON || vp->v_type == VBAD || 785 ((dep->de_flag & 786 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 787 (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) { 788 return(0); 789 } 790 if ((error = VOP_FSYNC(vp, info->waitfor)) != 0) 791 info->allerror = error; 792 return(0); 793 } 794 795 static int 796 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 797 { 798 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 799 struct defid *defhp = (struct defid *) fhp; 800 struct denode *dep; 801 int error; 802 803 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 804 if (error) { 805 *vpp = NULLVP; 806 return (error); 807 } 808 *vpp = DETOV(dep); 809 return (0); 810 } 811 812 static int 813 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 814 struct ucred **credanonp) 815 { 816 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 817 struct netcred *np; 818 819 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 820 if (np == NULL) 821 return (EACCES); 822 *exflagsp = np->netc_exflags; 823 *credanonp = &np->netc_anon; 824 return (0); 825 } 826 827 static int 828 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 829 { 830 struct denode *dep; 831 struct defid *defhp; 832 833 dep = VTODE(vp); 834 defhp = (struct defid *)fhp; 835 defhp->defid_len = sizeof(struct defid); 836 defhp->defid_dirclust = dep->de_dirclust; 837 defhp->defid_dirofs = dep->de_diroffset; 838 /* defhp->defid_gen = dep->de_gen; */ 839 return (0); 840 } 841 842 static struct vfsops msdosfs_vfsops = { 843 .vfs_mount = msdosfs_mount, 844 .vfs_unmount = msdosfs_unmount, 845 .vfs_root = msdosfs_root, 846 .vfs_statfs = msdosfs_statfs, 847 .vfs_sync = msdosfs_sync, 848 .vfs_fhtovp = msdosfs_fhtovp, 849 .vfs_checkexp = msdosfs_checkexp, 850 .vfs_vptofh = msdosfs_vptofh, 851 .vfs_init = msdosfs_init, 852 .vfs_uninit = msdosfs_uninit 853 }; 854 855 VFS_SET(msdosfs_vfsops, msdos, 0); 856