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sys/fs/msdosfs/msdosfs_vfsops.c
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1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ 3 4 /*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /*- 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/conf.h> 54 #include <sys/namei.h> 55 #include <sys/proc.h> 56 #include <sys/kernel.h> 57 #include <sys/vnode.h> 58 #include <sys/mount.h> 59 #include <sys/bio.h> 60 #include <sys/buf.h> 61 #include <sys/fcntl.h> 62 #include <sys/malloc.h> 63 #include <sys/stat.h> /* defines ALLPERMS */ 64 #include <sys/iconv.h> 65 #include <sys/mutex.h> 66 67 #include <fs/msdosfs/bpb.h> 68 #include <fs/msdosfs/bootsect.h> 69 #include <fs/msdosfs/msdosfsmount.h> 70 #include <fs/msdosfs/direntry.h> 71 #include <fs/msdosfs/denode.h> 72 #include <fs/msdosfs/fat.h> 73 74 #include "opt_msdosfs.h" 75 76 #define MSDOSFS_DFLTBSIZE 4096 77 78 #if 1 /*def PC98*/ 79 /* 80 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 81 * garbage or a random value :-{ 82 * If you want to use that broken-signatured media, define the 83 * following symbol even though PC/AT. 84 * (ex. mount PC-98 DOS formatted FD on PC/AT) 85 */ 86 #define MSDOSFS_NOCHECKSIG 87 #endif 88 89 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 90 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 91 92 struct iconv_functions *msdosfs_iconv = NULL; 93 94 static int update_mp(struct mount *mp, struct msdosfs_args *argp, 95 struct thread *td); 96 static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 97 struct thread *td, struct msdosfs_args *argp); 98 static vfs_fhtovp_t msdosfs_fhtovp; 99 static vfs_omount_t msdosfs_omount; 100 static vfs_root_t msdosfs_root; 101 static vfs_statfs_t msdosfs_statfs; 102 static vfs_sync_t msdosfs_sync; 103 static vfs_unmount_t msdosfs_unmount; 104 static vfs_vptofh_t msdosfs_vptofh; 105 106 /* Maximum length of a character set name (arbitrary). */ 107 #define MAXCSLEN 64 108 109 static int 110 update_mp(mp, argp, td) 111 struct mount *mp; 112 struct msdosfs_args *argp; 113 struct thread *td; 114 { 115 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 116 char *dos, *win, *local; 117 int error; 118 119 if (argp->flags & MSDOSFSMNT_KICONV) { 120 if (msdosfs_iconv) { 121 win = malloc(MAXCSLEN, M_TEMP, M_WAITOK); 122 local = malloc(MAXCSLEN, M_TEMP, M_WAITOK); 123 dos = malloc(MAXCSLEN, M_TEMP, M_WAITOK); 124 if ((error = copyinstr(argp->cs_win, win, MAXCSLEN, 125 NULL)) != 0) 126 goto iconvdone; 127 if ((error = copyinstr(argp->cs_local, local, MAXCSLEN, 128 NULL)) != 0) 129 goto iconvdone; 130 if ((error = copyinstr(argp->cs_dos, dos, MAXCSLEN, 131 NULL)) != 0) 132 goto iconvdone; 133 msdosfs_iconv->open(win, local, &pmp->pm_u2w); 134 msdosfs_iconv->open(local, win, &pmp->pm_w2u); 135 msdosfs_iconv->open(dos, local, &pmp->pm_u2d); 136 msdosfs_iconv->open(local, dos, &pmp->pm_d2u); 137 iconvdone: free(win, M_TEMP); 138 free(local, M_TEMP); 139 free(dos, M_TEMP); 140 if (error != 0) 141 return (error); 142 } else { 143 pmp->pm_w2u = NULL; 144 pmp->pm_u2w = NULL; 145 pmp->pm_d2u = NULL; 146 pmp->pm_u2d = NULL; 147 } 148 } 149 150 pmp->pm_gid = argp->gid; 151 pmp->pm_uid = argp->uid; 152 pmp->pm_mask = argp->mask & ALLPERMS; 153 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 154 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 155 156 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 157 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 158 else if (!(pmp->pm_flags & 159 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 160 struct vnode *rootvp; 161 162 /* 163 * Try to divine whether to support Win'95 long filenames 164 */ 165 if (FAT32(pmp)) 166 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 167 else { 168 if ((error = msdosfs_root(mp, &rootvp, td)) != 0) 169 return error; 170 pmp->pm_flags |= findwin95(VTODE(rootvp)) 171 ? MSDOSFSMNT_LONGNAME 172 : MSDOSFSMNT_SHORTNAME; 173 vput(rootvp); 174 } 175 } 176 return 0; 177 } 178 179 /* 180 * mp - path - addr in user space of mount point (ie /usr or whatever) 181 * data - addr in user space of mount params including the name of the block 182 * special file to treat as a filesystem. 183 */ 184 static int 185 msdosfs_omount(mp, path, data, td) 186 struct mount *mp; 187 char *path; 188 caddr_t data; 189 struct thread *td; 190 { 191 struct vnode *devvp; /* vnode for blk device to mount */ 192 struct msdosfs_args args; /* will hold data from mount request */ 193 /* msdosfs specific mount control block */ 194 struct msdosfsmount *pmp = NULL; 195 struct nameidata ndp; 196 size_t size; 197 int error, flags; 198 mode_t accessmode; 199 200 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 201 if (error) 202 return (error); 203 if (args.magic != MSDOSFS_ARGSMAGIC) 204 args.flags = 0; 205 /* 206 * If updating, check whether changing from read-only to 207 * read/write; if there is no device name, that's all we do. 208 */ 209 if (mp->mnt_flag & MNT_UPDATE) { 210 pmp = VFSTOMSDOSFS(mp); 211 error = 0; 212 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 213 error = VFS_SYNC(mp, MNT_WAIT, td->td_ucred, td); 214 if (error) 215 return (error); 216 flags = WRITECLOSE; 217 if (mp->mnt_flag & MNT_FORCE) 218 flags |= FORCECLOSE; 219 error = vflush(mp, 0, flags, td); 220 } 221 if (!error && (mp->mnt_flag & MNT_RELOAD)) 222 /* not yet implemented */ 223 error = EOPNOTSUPP; 224 if (error) 225 return (error); 226 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 227 /* 228 * If upgrade to read-write by non-root, then verify 229 * that user has necessary permissions on the device. 230 */ 231 if (suser(td)) { 232 devvp = pmp->pm_devvp; 233 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 234 error = VOP_ACCESS(devvp, VREAD | VWRITE, 235 td->td_ucred, td); 236 if (error) { 237 VOP_UNLOCK(devvp, 0, td); 238 return (error); 239 } 240 VOP_UNLOCK(devvp, 0, td); 241 } 242 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 243 244 /* Now that the volume is modifiable, mark it dirty. */ 245 error = markvoldirty(pmp, 1); 246 if (error) 247 return (error); 248 } 249 if (args.fspec == 0) { 250 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 251 if (args.flags & MSDOSFSMNT_MNTOPT) { 252 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 253 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 254 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 255 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 256 } 257 #endif 258 /* 259 * Process export requests. 260 */ 261 if ((args.export.ex_flags & MNT_EXPORTED) != 0 && 262 (pmp->pm_flags & MSDOSFS_LARGEFS) != 0) 263 return (EOPNOTSUPP); 264 return (vfs_export(mp, &args.export)); 265 } 266 } 267 /* 268 * Not an update, or updating the name: look up the name 269 * and verify that it refers to a sensible disk device. 270 */ 271 NDINIT(&ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td); 272 error = namei(&ndp); 273 if (error) 274 return (error); 275 devvp = ndp.ni_vp; 276 NDFREE(&ndp, NDF_ONLY_PNBUF); 277 278 if (!vn_isdisk(devvp, &error)) { 279 vrele(devvp); 280 return (error); 281 } 282 /* 283 * If mount by non-root, then verify that user has necessary 284 * permissions on the device. 285 */ 286 if (suser(td)) { 287 accessmode = VREAD; 288 if ((mp->mnt_flag & MNT_RDONLY) == 0) 289 accessmode |= VWRITE; 290 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 291 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 292 if (error) { 293 vput(devvp); 294 return (error); 295 } 296 VOP_UNLOCK(devvp, 0, td); 297 } 298 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 299 error = mountmsdosfs(devvp, mp, td, &args); 300 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 301 pmp = VFSTOMSDOSFS(mp); 302 #endif 303 } else { 304 if (devvp != pmp->pm_devvp) 305 error = EINVAL; /* XXX needs translation */ 306 else 307 vrele(devvp); 308 } 309 if (error) { 310 vrele(devvp); 311 return (error); 312 } 313 314 error = update_mp(mp, &args, td); 315 if (error) { 316 if ((mp->mnt_flag & MNT_UPDATE) == 0) 317 msdosfs_unmount(mp, MNT_FORCE, td); 318 return error; 319 } 320 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 321 &size); 322 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 323 (void) msdosfs_statfs(mp, &mp->mnt_stat, td); 324 #ifdef MSDOSFS_DEBUG 325 printf("msdosfs_omount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 326 #endif 327 return (0); 328 } 329 330 static int 331 mountmsdosfs(devvp, mp, td, argp) 332 struct vnode *devvp; 333 struct mount *mp; 334 struct thread *td; 335 struct msdosfs_args *argp; 336 { 337 struct msdosfsmount *pmp; 338 struct buf *bp; 339 struct cdev *dev = devvp->v_rdev; 340 union bootsector *bsp; 341 struct byte_bpb33 *b33; 342 struct byte_bpb50 *b50; 343 struct byte_bpb710 *b710; 344 u_int8_t SecPerClust; 345 u_long clusters; 346 int ronly, error; 347 348 /* 349 * Disallow multiple mounts of the same device. 350 * Disallow mounting of a device that is currently in use 351 * (except for root, which might share swap device for miniroot). 352 * Flush out any old buffers remaining from a previous use. 353 */ 354 error = vfs_mountedon(devvp); 355 if (error) 356 return (error); 357 if (vcount(devvp) > 1) 358 return (EBUSY); 359 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 360 error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0); 361 if (error) { 362 VOP_UNLOCK(devvp, 0, td); 363 return (error); 364 } 365 366 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 367 /* 368 * XXX: open the device with read and write access even if only 369 * read access is needed now. Write access is needed if the 370 * filesystem is ever mounted read/write, and we don't change the 371 * access mode for remounts. 372 */ 373 #ifdef notyet 374 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD | FWRITE, FSCRED, td, -1); 375 #else 376 error = VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, td, -1); 377 #endif 378 VOP_UNLOCK(devvp, 0, td); 379 if (error) 380 return (error); 381 382 bp = NULL; /* both used in error_exit */ 383 pmp = NULL; 384 385 /* 386 * Read the boot sector of the filesystem, and then check the 387 * boot signature. If not a dos boot sector then error out. 388 * 389 * NOTE: 2048 is a maximum sector size in current... 390 */ 391 error = bread(devvp, 0, 2048, NOCRED, &bp); 392 if (error) 393 goto error_exit; 394 bp->b_flags |= B_AGE; 395 bsp = (union bootsector *)bp->b_data; 396 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 397 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 398 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 399 400 #ifndef MSDOSFS_NOCHECKSIG 401 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 402 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 403 error = EINVAL; 404 goto error_exit; 405 } 406 #endif 407 408 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 409 pmp->pm_mountp = mp; 410 411 /* 412 * Compute several useful quantities from the bpb in the 413 * bootsector. Copy in the dos 5 variant of the bpb then fix up 414 * the fields that are different between dos 5 and dos 3.3. 415 */ 416 SecPerClust = b50->bpbSecPerClust; 417 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 418 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 419 error = EINVAL; 420 goto error_exit; 421 } 422 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 423 pmp->pm_FATs = b50->bpbFATs; 424 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 425 pmp->pm_Sectors = getushort(b50->bpbSectors); 426 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 427 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 428 pmp->pm_Heads = getushort(b50->bpbHeads); 429 pmp->pm_Media = b50->bpbMedia; 430 431 /* calculate the ratio of sector size to DEV_BSIZE */ 432 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 433 434 /* XXX - We should probably check more values here */ 435 if (!pmp->pm_BytesPerSec || !SecPerClust 436 || !pmp->pm_Heads 437 #ifdef PC98 438 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 439 #else 440 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 441 #endif 442 error = EINVAL; 443 goto error_exit; 444 } 445 446 if (pmp->pm_Sectors == 0) { 447 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 448 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 449 } else { 450 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 451 pmp->pm_HugeSectors = pmp->pm_Sectors; 452 } 453 #ifndef MSDOSFS_LARGE 454 if (pmp->pm_HugeSectors > 0xffffffff / 455 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 456 /* 457 * We cannot deal currently with this size of disk 458 * due to fileid limitations (see msdosfs_getattr and 459 * msdosfs_readdir) 460 */ 461 error = EINVAL; 462 printf("mountmsdosfs(): disk too big, sorry\n"); 463 goto error_exit; 464 } 465 #endif /* !MSDOSFS_LARGE */ 466 467 if (pmp->pm_RootDirEnts == 0) { 468 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 469 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 470 || pmp->pm_Sectors 471 || pmp->pm_FATsecs 472 || getushort(b710->bpbFSVers)) { 473 error = EINVAL; 474 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 475 goto error_exit; 476 } 477 pmp->pm_fatmask = FAT32_MASK; 478 pmp->pm_fatmult = 4; 479 pmp->pm_fatdiv = 1; 480 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 481 if (getushort(b710->bpbExtFlags) & FATMIRROR) 482 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 483 else 484 pmp->pm_flags |= MSDOSFS_FATMIRROR; 485 } else 486 pmp->pm_flags |= MSDOSFS_FATMIRROR; 487 488 /* 489 * Check a few values (could do some more): 490 * - logical sector size: power of 2, >= block size 491 * - sectors per cluster: power of 2, >= 1 492 * - number of sectors: >= 1, <= size of partition 493 * - number of FAT sectors: >= 1 494 */ 495 if ( (SecPerClust == 0) 496 || (SecPerClust & (SecPerClust - 1)) 497 || (pmp->pm_BytesPerSec < DEV_BSIZE) 498 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 499 || (pmp->pm_HugeSectors == 0) 500 || (pmp->pm_FATsecs == 0) 501 ) { 502 error = EINVAL; 503 goto error_exit; 504 } 505 506 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 507 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 508 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 509 SecPerClust *= pmp->pm_BlkPerSec; 510 511 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 512 513 if (FAT32(pmp)) { 514 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 515 pmp->pm_firstcluster = pmp->pm_fatblk 516 + (pmp->pm_FATs * pmp->pm_FATsecs); 517 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 518 } else { 519 pmp->pm_rootdirblk = pmp->pm_fatblk + 520 (pmp->pm_FATs * pmp->pm_FATsecs); 521 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 522 + DEV_BSIZE - 1) 523 / DEV_BSIZE; /* in blocks */ 524 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 525 } 526 527 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 528 SecPerClust + 1; 529 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 530 531 if (pmp->pm_fatmask == 0) { 532 if (pmp->pm_maxcluster 533 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 534 /* 535 * This will usually be a floppy disk. This size makes 536 * sure that one fat entry will not be split across 537 * multiple blocks. 538 */ 539 pmp->pm_fatmask = FAT12_MASK; 540 pmp->pm_fatmult = 3; 541 pmp->pm_fatdiv = 2; 542 } else { 543 pmp->pm_fatmask = FAT16_MASK; 544 pmp->pm_fatmult = 2; 545 pmp->pm_fatdiv = 1; 546 } 547 } 548 549 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 550 if (pmp->pm_maxcluster >= clusters) { 551 printf("Warning: number of clusters (%ld) exceeds FAT " 552 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 553 pmp->pm_maxcluster = clusters - 1; 554 } 555 556 557 if (FAT12(pmp)) 558 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 559 else 560 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 561 562 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 563 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 564 565 /* 566 * Compute mask and shift value for isolating cluster relative byte 567 * offsets and cluster numbers from a file offset. 568 */ 569 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 570 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 571 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 572 573 /* 574 * Check for valid cluster size 575 * must be a power of 2 576 */ 577 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 578 error = EINVAL; 579 goto error_exit; 580 } 581 582 /* 583 * Release the bootsector buffer. 584 */ 585 brelse(bp); 586 bp = NULL; 587 588 /* 589 * Check FSInfo. 590 */ 591 if (pmp->pm_fsinfo) { 592 struct fsinfo *fp; 593 594 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 595 NOCRED, &bp)) != 0) 596 goto error_exit; 597 fp = (struct fsinfo *)bp->b_data; 598 if (!bcmp(fp->fsisig1, "RRaA", 4) 599 && !bcmp(fp->fsisig2, "rrAa", 4) 600 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 601 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 602 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 603 if (pmp->pm_nxtfree == 0xffffffff) 604 pmp->pm_nxtfree = CLUST_FIRST; 605 } else 606 pmp->pm_fsinfo = 0; 607 brelse(bp); 608 bp = NULL; 609 } 610 611 /* 612 * Check and validate (or perhaps invalidate?) the fsinfo structure? 613 */ 614 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 615 printf( 616 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 617 pmp->pm_nxtfree, pmp->pm_maxcluster); 618 error = EINVAL; 619 goto error_exit; 620 } 621 622 /* 623 * Allocate memory for the bitmap of allocated clusters, and then 624 * fill it in. 625 */ 626 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 627 * sizeof(*pmp->pm_inusemap), 628 M_MSDOSFSFAT, M_WAITOK); 629 630 /* 631 * fillinusemap() needs pm_devvp. 632 */ 633 pmp->pm_dev = dev; 634 pmp->pm_devvp = devvp; 635 636 /* 637 * Have the inuse map filled in. 638 */ 639 if ((error = fillinusemap(pmp)) != 0) 640 goto error_exit; 641 642 /* 643 * If they want fat updates to be synchronous then let them suffer 644 * the performance degradation in exchange for the on disk copy of 645 * the fat being correct just about all the time. I suppose this 646 * would be a good thing to turn on if the kernel is still flakey. 647 */ 648 if (mp->mnt_flag & MNT_SYNCHRONOUS) 649 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 650 651 /* 652 * Finish up. 653 */ 654 if (ronly) 655 pmp->pm_flags |= MSDOSFSMNT_RONLY; 656 else { 657 /* Mark the volume dirty while it is mounted read/write. */ 658 if ((error = markvoldirty(pmp, 1)) != 0) 659 goto error_exit; 660 pmp->pm_fmod = 1; 661 } 662 mp->mnt_data = (qaddr_t) pmp; 663 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 664 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 665 mp->mnt_flag |= MNT_LOCAL; 666 devvp->v_rdev->si_mountpoint = mp; 667 668 #ifdef MSDOSFS_LARGE 669 msdosfs_fileno_init(mp); 670 #endif 671 672 return 0; 673 674 error_exit: 675 if (bp) 676 brelse(bp); 677 /* XXX: see comment above VOP_OPEN. */ 678 #ifdef notyet 679 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, td); 680 #else 681 (void)VOP_CLOSE(devvp, FREAD | FWRITE, NOCRED, td); 682 #endif 683 if (pmp) { 684 if (pmp->pm_inusemap) 685 free(pmp->pm_inusemap, M_MSDOSFSFAT); 686 free(pmp, M_MSDOSFSMNT); 687 mp->mnt_data = (qaddr_t)0; 688 } 689 return (error); 690 } 691 692 /* 693 * Unmount the filesystem described by mp. 694 */ 695 static int 696 msdosfs_unmount(mp, mntflags, td) 697 struct mount *mp; 698 int mntflags; 699 struct thread *td; 700 { 701 struct msdosfsmount *pmp; 702 int error, flags; 703 704 flags = 0; 705 if (mntflags & MNT_FORCE) 706 flags |= FORCECLOSE; 707 error = vflush(mp, 0, flags, td); 708 if (error) 709 return error; 710 pmp = VFSTOMSDOSFS(mp); 711 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 712 if (pmp->pm_w2u) 713 msdosfs_iconv->close(pmp->pm_w2u); 714 if (pmp->pm_u2w) 715 msdosfs_iconv->close(pmp->pm_u2w); 716 if (pmp->pm_d2u) 717 msdosfs_iconv->close(pmp->pm_d2u); 718 if (pmp->pm_u2d) 719 msdosfs_iconv->close(pmp->pm_u2d); 720 } 721 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 722 723 /* If the volume was mounted read/write, mark it clean now. */ 724 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 725 error = markvoldirty(pmp, 0); 726 if (error && (flags & FORCECLOSE) == 0) 727 return (error); 728 } 729 #ifdef MSDOSFS_DEBUG 730 { 731 struct vnode *vp = pmp->pm_devvp; 732 733 VI_LOCK(vp); 734 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 735 printf("iflag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 736 vp->vi_flag, vp->v_usecount, vp->v_writecount, 737 vp->v_holdcnt); 738 printf("id %lu, mount %p, op %p\n", 739 vp->v_id, vp->v_mount, vp->v_op); 740 printf("freef %p, freeb %p, mount %p\n", 741 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 742 vp->v_mount); 743 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 744 TAILQ_FIRST(&vp->v_cleanblkhd), 745 TAILQ_FIRST(&vp->v_dirtyblkhd), 746 vp->v_numoutput, vp->v_type); 747 printf("union %p, tag %s, data[0] %08x, data[1] %08x\n", 748 vp->v_socket, vp->v_tag, 749 ((u_int *)vp->v_data)[0], 750 ((u_int *)vp->v_data)[1]); 751 VI_UNLOCK(vp); 752 } 753 #endif 754 /* XXX: see comment above VOP_OPEN. */ 755 #ifdef notyet 756 error = VOP_CLOSE(pmp->pm_devvp, 757 (pmp->pm_flags & MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 758 NOCRED, td); 759 #else 760 error = VOP_CLOSE(pmp->pm_devvp, FREAD | FWRITE, NOCRED, td); 761 #endif 762 vrele(pmp->pm_devvp); 763 free(pmp->pm_inusemap, M_MSDOSFSFAT); 764 #ifdef MSDOSFS_LARGE 765 msdosfs_fileno_free(mp); 766 #endif 767 free(pmp, M_MSDOSFSMNT); 768 mp->mnt_data = (qaddr_t)0; 769 mp->mnt_flag &= ~MNT_LOCAL; 770 return (error); 771 } 772 773 static int 774 msdosfs_root(mp, vpp, td) 775 struct mount *mp; 776 struct vnode **vpp; 777 struct thread *td; 778 { 779 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 780 struct denode *ndep; 781 int error; 782 783 #ifdef MSDOSFS_DEBUG 784 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 785 #endif 786 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 787 if (error) 788 return (error); 789 *vpp = DETOV(ndep); 790 return (0); 791 } 792 793 static int 794 msdosfs_statfs(mp, sbp, td) 795 struct mount *mp; 796 struct statfs *sbp; 797 struct thread *td; 798 { 799 struct msdosfsmount *pmp; 800 801 pmp = VFSTOMSDOSFS(mp); 802 sbp->f_bsize = pmp->pm_bpcluster; 803 sbp->f_iosize = pmp->pm_bpcluster; 804 sbp->f_blocks = pmp->pm_maxcluster + 1; 805 sbp->f_bfree = pmp->pm_freeclustercount; 806 sbp->f_bavail = pmp->pm_freeclustercount; 807 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 808 sbp->f_ffree = 0; /* what to put in here? */ 809 if (sbp != &mp->mnt_stat) { 810 sbp->f_type = mp->mnt_vfc->vfc_typenum; 811 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 812 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 813 } 814 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 815 return (0); 816 } 817 818 static int 819 msdosfs_sync(mp, waitfor, cred, td) 820 struct mount *mp; 821 int waitfor; 822 struct ucred *cred; 823 struct thread *td; 824 { 825 struct vnode *vp, *nvp; 826 struct denode *dep; 827 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 828 int error, allerror = 0; 829 830 /* 831 * If we ever switch to not updating all of the fats all the time, 832 * this would be the place to update them from the first one. 833 */ 834 if (pmp->pm_fmod != 0) { 835 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 836 panic("msdosfs_sync: rofs mod"); 837 else { 838 /* update fats here */ 839 } 840 } 841 /* 842 * Write back each (modified) denode. 843 */ 844 MNT_ILOCK(mp); 845 loop: 846 MNT_VNODE_FOREACH(vp, mp, nvp) { 847 VI_LOCK(vp); 848 if (vp->v_iflag & VI_XLOCK) { 849 VI_UNLOCK(vp); 850 continue; 851 } 852 MNT_IUNLOCK(mp); 853 dep = VTODE(vp); 854 if (vp->v_type == VNON || 855 ((dep->de_flag & 856 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 857 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 858 VI_UNLOCK(vp); 859 MNT_ILOCK(mp); 860 continue; 861 } 862 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 863 if (error) { 864 MNT_ILOCK(mp); 865 if (error == ENOENT) 866 goto loop; 867 continue; 868 } 869 error = VOP_FSYNC(vp, cred, waitfor, td); 870 if (error) 871 allerror = error; 872 VOP_UNLOCK(vp, 0, td); 873 vrele(vp); 874 MNT_ILOCK(mp); 875 } 876 MNT_IUNLOCK(mp); 877 878 /* 879 * Flush filesystem control info. 880 */ 881 if (waitfor != MNT_LAZY) { 882 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 883 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, td); 884 if (error) 885 allerror = error; 886 VOP_UNLOCK(pmp->pm_devvp, 0, td); 887 } 888 return (allerror); 889 } 890 891 static int 892 msdosfs_fhtovp(mp, fhp, vpp) 893 struct mount *mp; 894 struct fid *fhp; 895 struct vnode **vpp; 896 { 897 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 898 struct defid *defhp = (struct defid *) fhp; 899 struct denode *dep; 900 int error; 901 902 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 903 if (error) { 904 *vpp = NULLVP; 905 return (error); 906 } 907 *vpp = DETOV(dep); 908 return (0); 909 } 910 911 static int 912 msdosfs_vptofh(vp, fhp) 913 struct vnode *vp; 914 struct fid *fhp; 915 { 916 struct denode *dep; 917 struct defid *defhp; 918 919 dep = VTODE(vp); 920 defhp = (struct defid *)fhp; 921 defhp->defid_len = sizeof(struct defid); 922 defhp->defid_dirclust = dep->de_dirclust; 923 defhp->defid_dirofs = dep->de_diroffset; 924 /* defhp->defid_gen = dep->de_gen; */ 925 return (0); 926 } 927 928 static struct vfsops msdosfs_vfsops = { 929 .vfs_fhtovp = msdosfs_fhtovp, 930 .vfs_init = msdosfs_init, 931 .vfs_omount = msdosfs_omount, 932 .vfs_root = msdosfs_root, 933 .vfs_statfs = msdosfs_statfs, 934 .vfs_sync = msdosfs_sync, 935 .vfs_uninit = msdosfs_uninit, 936 .vfs_unmount = msdosfs_unmount, 937 .vfs_vptofh = msdosfs_vptofh, 938 }; 939 940 VFS_SET(msdosfs_vfsops, msdosfs, 0); 941 MODULE_VERSION(msdosfs, 1);
Cache object: d29d4bebe30fd9aa8dde00015d41fcc8
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