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/mutex.h> 65 66 #include <fs/msdosfs/bpb.h> 67 #include <fs/msdosfs/bootsect.h> 68 #include <fs/msdosfs/direntry.h> 69 #include <fs/msdosfs/denode.h> 70 #include <fs/msdosfs/msdosfsmount.h> 71 #include <fs/msdosfs/fat.h> 72 73 #define MSDOSFS_DFLTBSIZE 4096 74 75 #if 1 /*def PC98*/ 76 /* 77 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 78 * garbage or a random value :-{ 79 * If you want to use that broken-signatured media, define the 80 * following symbol even though PC/AT. 81 * (ex. mount PC-98 DOS formatted FD on PC/AT) 82 */ 83 #define MSDOSFS_NOCHECKSIG 84 #endif 85 86 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 87 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 88 89 static int update_mp(struct mount *mp, struct msdosfs_args *argp); 90 static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 91 struct thread *td, struct msdosfs_args *argp); 92 static vfs_fhtovp_t msdosfs_fhtovp; 93 static vfs_mount_t msdosfs_mount; 94 static vfs_root_t msdosfs_root; 95 static vfs_statfs_t msdosfs_statfs; 96 static vfs_sync_t msdosfs_sync; 97 static vfs_unmount_t msdosfs_unmount; 98 static vfs_vptofh_t msdosfs_vptofh; 99 100 static int 101 update_mp(mp, argp) 102 struct mount *mp; 103 struct msdosfs_args *argp; 104 { 105 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 106 int error; 107 108 pmp->pm_gid = argp->gid; 109 pmp->pm_uid = argp->uid; 110 pmp->pm_mask = argp->mask & ALLPERMS; 111 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 112 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 113 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 114 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 115 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 116 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 117 } 118 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 119 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 120 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 121 } 122 123 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 124 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 125 else if (!(pmp->pm_flags & 126 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 127 struct vnode *rootvp; 128 129 /* 130 * Try to divine whether to support Win'95 long filenames 131 */ 132 if (FAT32(pmp)) 133 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 134 else { 135 if ((error = msdosfs_root(mp, &rootvp)) != 0) 136 return error; 137 pmp->pm_flags |= findwin95(VTODE(rootvp)) 138 ? MSDOSFSMNT_LONGNAME 139 : MSDOSFSMNT_SHORTNAME; 140 vput(rootvp); 141 } 142 } 143 return 0; 144 } 145 146 /* 147 * mp - path - addr in user space of mount point (ie /usr or whatever) 148 * data - addr in user space of mount params including the name of the block 149 * special file to treat as a filesystem. 150 */ 151 static int 152 msdosfs_mount(mp, path, data, ndp, td) 153 struct mount *mp; 154 char *path; 155 caddr_t data; 156 struct nameidata *ndp; 157 struct thread *td; 158 { 159 struct vnode *devvp; /* vnode for blk device to mount */ 160 struct msdosfs_args args; /* will hold data from mount request */ 161 /* msdosfs specific mount control block */ 162 struct msdosfsmount *pmp = NULL; 163 size_t size; 164 int error, flags; 165 mode_t accessmode; 166 167 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 168 if (error) 169 return (error); 170 if (args.magic != MSDOSFS_ARGSMAGIC) 171 args.flags = 0; 172 /* 173 * If updating, check whether changing from read-only to 174 * read/write; if there is no device name, that's all we do. 175 */ 176 if (mp->mnt_flag & MNT_UPDATE) { 177 pmp = VFSTOMSDOSFS(mp); 178 error = 0; 179 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 180 flags = WRITECLOSE; 181 if (mp->mnt_flag & MNT_FORCE) 182 flags |= FORCECLOSE; 183 error = vflush(mp, 0, flags); 184 } 185 if (!error && (mp->mnt_flag & MNT_RELOAD)) 186 /* not yet implemented */ 187 error = EOPNOTSUPP; 188 if (error) 189 return (error); 190 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 191 /* 192 * If upgrade to read-write by non-root, then verify 193 * that user has necessary permissions on the device. 194 */ 195 if (suser(td)) { 196 devvp = pmp->pm_devvp; 197 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 198 error = VOP_ACCESS(devvp, VREAD | VWRITE, 199 td->td_ucred, td); 200 if (error) { 201 VOP_UNLOCK(devvp, 0, td); 202 return (error); 203 } 204 VOP_UNLOCK(devvp, 0, td); 205 } 206 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 207 } 208 if (args.fspec == 0) { 209 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 210 if (args.flags & MSDOSFSMNT_MNTOPT) { 211 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 212 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 213 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 214 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 215 } 216 #endif 217 /* 218 * Process export requests. 219 */ 220 return (vfs_export(mp, &args.export)); 221 } 222 } 223 /* 224 * Not an update, or updating the name: look up the name 225 * and verify that it refers to a sensible block device. 226 */ 227 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td); 228 error = namei(ndp); 229 if (error) 230 return (error); 231 devvp = ndp->ni_vp; 232 NDFREE(ndp, NDF_ONLY_PNBUF); 233 234 if (!vn_isdisk(devvp, &error)) { 235 vrele(devvp); 236 return (error); 237 } 238 /* 239 * If mount by non-root, then verify that user has necessary 240 * permissions on the device. 241 */ 242 if (suser(td)) { 243 accessmode = VREAD; 244 if ((mp->mnt_flag & MNT_RDONLY) == 0) 245 accessmode |= VWRITE; 246 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 247 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 248 if (error) { 249 vput(devvp); 250 return (error); 251 } 252 VOP_UNLOCK(devvp, 0, td); 253 } 254 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 255 error = mountmsdosfs(devvp, mp, td, &args); 256 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 257 pmp = VFSTOMSDOSFS(mp); 258 #endif 259 } else { 260 if (devvp != pmp->pm_devvp) 261 error = EINVAL; /* XXX needs translation */ 262 else 263 vrele(devvp); 264 } 265 if (error) { 266 vrele(devvp); 267 return (error); 268 } 269 270 error = update_mp(mp, &args); 271 if (error) { 272 msdosfs_unmount(mp, MNT_FORCE, td); 273 return error; 274 } 275 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 276 &size); 277 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 278 (void) msdosfs_statfs(mp, &mp->mnt_stat, td); 279 #ifdef MSDOSFS_DEBUG 280 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 281 #endif 282 return (0); 283 } 284 285 static int 286 mountmsdosfs(devvp, mp, td, argp) 287 struct vnode *devvp; 288 struct mount *mp; 289 struct thread *td; 290 struct msdosfs_args *argp; 291 { 292 struct msdosfsmount *pmp; 293 struct buf *bp; 294 dev_t dev = devvp->v_rdev; 295 union bootsector *bsp; 296 struct byte_bpb33 *b33; 297 struct byte_bpb50 *b50; 298 struct byte_bpb710 *b710; 299 u_int8_t SecPerClust; 300 u_long clusters; 301 int ronly, error; 302 303 /* 304 * Disallow multiple mounts of the same device. 305 * Disallow mounting of a device that is currently in use 306 * (except for root, which might share swap device for miniroot). 307 * Flush out any old buffers remaining from a previous use. 308 */ 309 error = vfs_mountedon(devvp); 310 if (error) 311 return (error); 312 if (vcount(devvp) > 1 && devvp != rootvp) 313 return (EBUSY); 314 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 315 error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0); 316 VOP_UNLOCK(devvp, 0, td); 317 if (error) 318 return (error); 319 320 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 321 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 322 /* 323 * XXX Open the device with write access even if the filesystem 324 * is read-only: someone may remount it read-write later, and 325 * we don't VOP_OPEN the device again in that case. 326 */ 327 #ifdef notyet 328 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td, -1); 329 #else 330 error = VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, td, -1); 331 #endif 332 VOP_UNLOCK(devvp, 0, td); 333 if (error) 334 return (error); 335 336 bp = NULL; /* both used in error_exit */ 337 pmp = NULL; 338 339 /* 340 * Read the boot sector of the filesystem, and then check the 341 * boot signature. If not a dos boot sector then error out. 342 * 343 * NOTE: 2048 is a maximum sector size in current... 344 */ 345 error = bread(devvp, 0, 2048, NOCRED, &bp); 346 if (error) 347 goto error_exit; 348 bp->b_flags |= B_AGE; 349 bsp = (union bootsector *)bp->b_data; 350 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 351 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 352 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 353 354 #ifndef MSDOSFS_NOCHECKSIG 355 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 356 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 357 error = EINVAL; 358 goto error_exit; 359 } 360 #endif 361 362 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 363 pmp->pm_mountp = mp; 364 365 /* 366 * Compute several useful quantities from the bpb in the 367 * bootsector. Copy in the dos 5 variant of the bpb then fix up 368 * the fields that are different between dos 5 and dos 3.3. 369 */ 370 SecPerClust = b50->bpbSecPerClust; 371 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 372 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 373 error = EINVAL; 374 goto error_exit; 375 } 376 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 377 pmp->pm_FATs = b50->bpbFATs; 378 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 379 pmp->pm_Sectors = getushort(b50->bpbSectors); 380 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 381 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 382 pmp->pm_Heads = getushort(b50->bpbHeads); 383 pmp->pm_Media = b50->bpbMedia; 384 385 /* calculate the ratio of sector size to DEV_BSIZE */ 386 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 387 388 /* XXX - We should probably check more values here */ 389 if (!pmp->pm_BytesPerSec || !SecPerClust 390 || !pmp->pm_Heads || pmp->pm_Heads > 255 391 #ifdef PC98 392 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 393 #else 394 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 395 #endif 396 error = EINVAL; 397 goto error_exit; 398 } 399 400 if (pmp->pm_Sectors == 0) { 401 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 402 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 403 } else { 404 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 405 pmp->pm_HugeSectors = pmp->pm_Sectors; 406 } 407 if (pmp->pm_HugeSectors > 0xffffffff / 408 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 409 /* 410 * We cannot deal currently with this size of disk 411 * due to fileid limitations (see msdosfs_getattr and 412 * msdosfs_readdir) 413 */ 414 error = EINVAL; 415 printf("mountmsdosfs(): disk too big, sorry\n"); 416 goto error_exit; 417 } 418 419 if (pmp->pm_RootDirEnts == 0) { 420 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 421 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 422 || pmp->pm_Sectors 423 || pmp->pm_FATsecs 424 || getushort(b710->bpbFSVers)) { 425 error = EINVAL; 426 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 427 goto error_exit; 428 } 429 pmp->pm_fatmask = FAT32_MASK; 430 pmp->pm_fatmult = 4; 431 pmp->pm_fatdiv = 1; 432 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 433 if (getushort(b710->bpbExtFlags) & FATMIRROR) 434 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 435 else 436 pmp->pm_flags |= MSDOSFS_FATMIRROR; 437 } else 438 pmp->pm_flags |= MSDOSFS_FATMIRROR; 439 440 /* 441 * Check a few values (could do some more): 442 * - logical sector size: power of 2, >= block size 443 * - sectors per cluster: power of 2, >= 1 444 * - number of sectors: >= 1, <= size of partition 445 * - number of FAT sectors: >= 1 446 */ 447 if ( (SecPerClust == 0) 448 || (SecPerClust & (SecPerClust - 1)) 449 || (pmp->pm_BytesPerSec < DEV_BSIZE) 450 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 451 || (pmp->pm_HugeSectors == 0) 452 || (pmp->pm_FATsecs == 0) 453 ) { 454 error = EINVAL; 455 goto error_exit; 456 } 457 458 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 459 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 460 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 461 SecPerClust *= pmp->pm_BlkPerSec; 462 463 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 464 465 if (FAT32(pmp)) { 466 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 467 pmp->pm_firstcluster = pmp->pm_fatblk 468 + (pmp->pm_FATs * pmp->pm_FATsecs); 469 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 470 } else { 471 pmp->pm_rootdirblk = pmp->pm_fatblk + 472 (pmp->pm_FATs * pmp->pm_FATsecs); 473 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 474 + DEV_BSIZE - 1) 475 / DEV_BSIZE; /* in blocks */ 476 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 477 } 478 479 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 480 SecPerClust + 1; 481 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 482 483 if (pmp->pm_fatmask == 0) { 484 if (pmp->pm_maxcluster 485 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 486 /* 487 * This will usually be a floppy disk. This size makes 488 * sure that one fat entry will not be split across 489 * multiple blocks. 490 */ 491 pmp->pm_fatmask = FAT12_MASK; 492 pmp->pm_fatmult = 3; 493 pmp->pm_fatdiv = 2; 494 } else { 495 pmp->pm_fatmask = FAT16_MASK; 496 pmp->pm_fatmult = 2; 497 pmp->pm_fatdiv = 1; 498 } 499 } 500 501 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 502 if (pmp->pm_maxcluster >= clusters) { 503 printf("Warning: number of clusters (%ld) exceeds FAT " 504 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 505 pmp->pm_maxcluster = clusters - 1; 506 } 507 508 509 if (FAT12(pmp)) 510 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 511 else 512 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 513 514 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 515 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 516 517 /* 518 * Compute mask and shift value for isolating cluster relative byte 519 * offsets and cluster numbers from a file offset. 520 */ 521 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 522 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 523 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 524 525 /* 526 * Check for valid cluster size 527 * must be a power of 2 528 */ 529 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 530 error = EINVAL; 531 goto error_exit; 532 } 533 534 /* 535 * Release the bootsector buffer. 536 */ 537 brelse(bp); 538 bp = NULL; 539 540 /* 541 * Check FSInfo. 542 */ 543 if (pmp->pm_fsinfo) { 544 struct fsinfo *fp; 545 546 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 547 NOCRED, &bp)) != 0) 548 goto error_exit; 549 fp = (struct fsinfo *)bp->b_data; 550 if (!bcmp(fp->fsisig1, "RRaA", 4) 551 && !bcmp(fp->fsisig2, "rrAa", 4) 552 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 553 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 554 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 555 else 556 pmp->pm_fsinfo = 0; 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 printf( 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 = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 577 / N_INUSEBITS) 578 * sizeof(*pmp->pm_inusemap), 579 M_MSDOSFSFAT, M_WAITOK); 580 581 /* 582 * fillinusemap() needs pm_devvp. 583 */ 584 pmp->pm_dev = dev; 585 pmp->pm_devvp = devvp; 586 587 /* 588 * Have the inuse map filled in. 589 */ 590 if ((error = fillinusemap(pmp)) != 0) 591 goto error_exit; 592 593 /* 594 * If they want fat updates to be synchronous then let them suffer 595 * the performance degradation in exchange for the on disk copy of 596 * the fat being correct just about all the time. I suppose this 597 * would be a good thing to turn on if the kernel is still flakey. 598 */ 599 if (mp->mnt_flag & MNT_SYNCHRONOUS) 600 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 601 602 /* 603 * Finish up. 604 */ 605 if (ronly) 606 pmp->pm_flags |= MSDOSFSMNT_RONLY; 607 else 608 pmp->pm_fmod = 1; 609 mp->mnt_data = (qaddr_t) pmp; 610 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 611 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 612 mp->mnt_flag |= MNT_LOCAL; 613 devvp->v_rdev->si_mountpoint = mp; 614 615 return 0; 616 617 error_exit: 618 if (bp) 619 brelse(bp); 620 /* XXX See comment at VOP_OPEN call */ 621 #ifdef notyet 622 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, td); 623 #else 624 (void) VOP_CLOSE(devvp, FREAD | FWRITE, NOCRED, td); 625 #endif 626 if (pmp) { 627 if (pmp->pm_inusemap) 628 free(pmp->pm_inusemap, M_MSDOSFSFAT); 629 free(pmp, M_MSDOSFSMNT); 630 mp->mnt_data = (qaddr_t)0; 631 } 632 return (error); 633 } 634 635 /* 636 * Unmount the filesystem described by mp. 637 */ 638 static int 639 msdosfs_unmount(mp, mntflags, td) 640 struct mount *mp; 641 int mntflags; 642 struct thread *td; 643 { 644 struct msdosfsmount *pmp; 645 int error, flags; 646 647 flags = 0; 648 if (mntflags & MNT_FORCE) 649 flags |= FORCECLOSE; 650 error = vflush(mp, 0, flags); 651 if (error) 652 return error; 653 pmp = VFSTOMSDOSFS(mp); 654 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 655 #ifdef MSDOSFS_DEBUG 656 { 657 struct vnode *vp = pmp->pm_devvp; 658 659 VI_LOCK(vp); 660 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 661 printf("iflag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 662 vp->vi_flag, vp->v_usecount, vp->v_writecount, 663 vp->v_holdcnt); 664 printf("id %lu, mount %p, op %p\n", 665 vp->v_id, vp->v_mount, vp->v_op); 666 printf("freef %p, freeb %p, mount %p\n", 667 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 668 vp->v_mount); 669 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 670 TAILQ_FIRST(&vp->v_cleanblkhd), 671 TAILQ_FIRST(&vp->v_dirtyblkhd), 672 vp->v_numoutput, vp->v_type); 673 printf("union %p, tag %s, data[0] %08x, data[1] %08x\n", 674 vp->v_socket, vp->v_tag, 675 ((u_int *)vp->v_data)[0], 676 ((u_int *)vp->v_data)[1]); 677 VI_UNLOCK(vp); 678 } 679 #endif 680 /* XXX See comment at VOP_OPEN call */ 681 #ifdef notyet 682 error = VOP_CLOSE(pmp->pm_devvp, 683 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 684 NOCRED, td); 685 #else 686 error = VOP_CLOSE(pmp->pm_devvp, FREAD | FWRITE, NOCRED, td); 687 #endif 688 vrele(pmp->pm_devvp); 689 free(pmp->pm_inusemap, M_MSDOSFSFAT); 690 free(pmp, M_MSDOSFSMNT); 691 mp->mnt_data = (qaddr_t)0; 692 mp->mnt_flag &= ~MNT_LOCAL; 693 return (error); 694 } 695 696 static int 697 msdosfs_root(mp, vpp) 698 struct mount *mp; 699 struct vnode **vpp; 700 { 701 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 702 struct denode *ndep; 703 int error; 704 705 #ifdef MSDOSFS_DEBUG 706 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 707 #endif 708 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 709 if (error) 710 return (error); 711 *vpp = DETOV(ndep); 712 return (0); 713 } 714 715 static int 716 msdosfs_statfs(mp, sbp, td) 717 struct mount *mp; 718 struct statfs *sbp; 719 struct thread *td; 720 { 721 struct msdosfsmount *pmp; 722 723 pmp = VFSTOMSDOSFS(mp); 724 sbp->f_bsize = pmp->pm_bpcluster; 725 sbp->f_iosize = pmp->pm_bpcluster; 726 sbp->f_blocks = pmp->pm_maxcluster + 1; 727 sbp->f_bfree = pmp->pm_freeclustercount; 728 sbp->f_bavail = pmp->pm_freeclustercount; 729 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 730 sbp->f_ffree = 0; /* what to put in here? */ 731 if (sbp != &mp->mnt_stat) { 732 sbp->f_type = mp->mnt_vfc->vfc_typenum; 733 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 734 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 735 } 736 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 737 return (0); 738 } 739 740 static int 741 msdosfs_sync(mp, waitfor, cred, td) 742 struct mount *mp; 743 int waitfor; 744 struct ucred *cred; 745 struct thread *td; 746 { 747 struct vnode *vp, *nvp; 748 struct denode *dep; 749 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 750 int error, allerror = 0; 751 752 /* 753 * If we ever switch to not updating all of the fats all the time, 754 * this would be the place to update them from the first one. 755 */ 756 if (pmp->pm_fmod != 0) { 757 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 758 panic("msdosfs_sync: rofs mod"); 759 else { 760 /* update fats here */ 761 } 762 } 763 /* 764 * Write back each (modified) denode. 765 */ 766 mtx_lock(&mntvnode_mtx); 767 loop: 768 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) { 769 /* 770 * If the vnode that we are about to sync is no longer 771 * associated with this mount point, start over. 772 */ 773 if (vp->v_mount != mp) 774 goto loop; 775 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 776 777 mtx_unlock(&mntvnode_mtx); 778 VI_LOCK(vp); 779 dep = VTODE(vp); 780 if (vp->v_type == VNON || 781 ((dep->de_flag & 782 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 783 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 784 VI_UNLOCK(vp); 785 mtx_lock(&mntvnode_mtx); 786 continue; 787 } 788 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 789 if (error) { 790 mtx_lock(&mntvnode_mtx); 791 if (error == ENOENT) 792 goto loop; 793 continue; 794 } 795 error = VOP_FSYNC(vp, cred, waitfor, td); 796 if (error) 797 allerror = error; 798 VOP_UNLOCK(vp, 0, td); 799 vrele(vp); 800 mtx_lock(&mntvnode_mtx); 801 } 802 mtx_unlock(&mntvnode_mtx); 803 804 /* 805 * Flush filesystem control info. 806 */ 807 if (waitfor != MNT_LAZY) { 808 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 809 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, td); 810 if (error) 811 allerror = error; 812 VOP_UNLOCK(pmp->pm_devvp, 0, td); 813 } 814 return (allerror); 815 } 816 817 static int 818 msdosfs_fhtovp(mp, fhp, vpp) 819 struct mount *mp; 820 struct fid *fhp; 821 struct vnode **vpp; 822 { 823 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 824 struct defid *defhp = (struct defid *) fhp; 825 struct denode *dep; 826 int error; 827 828 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 829 if (error) { 830 *vpp = NULLVP; 831 return (error); 832 } 833 *vpp = DETOV(dep); 834 return (0); 835 } 836 837 static int 838 msdosfs_vptofh(vp, fhp) 839 struct vnode *vp; 840 struct fid *fhp; 841 { 842 struct denode *dep; 843 struct defid *defhp; 844 845 dep = VTODE(vp); 846 defhp = (struct defid *)fhp; 847 defhp->defid_len = sizeof(struct defid); 848 defhp->defid_dirclust = dep->de_dirclust; 849 defhp->defid_dirofs = dep->de_diroffset; 850 /* defhp->defid_gen = dep->de_gen; */ 851 return (0); 852 } 853 854 static struct vfsops msdosfs_vfsops = { 855 .vfs_fhtovp = msdosfs_fhtovp, 856 .vfs_init = msdosfs_init, 857 .vfs_mount = msdosfs_mount, 858 .vfs_root = msdosfs_root, 859 .vfs_statfs = msdosfs_statfs, 860 .vfs_sync = msdosfs_sync, 861 .vfs_uninit = msdosfs_uninit, 862 .vfs_unmount = msdosfs_unmount, 863 .vfs_vptofh = msdosfs_vptofh, 864 }; 865 866 VFS_SET(msdosfs_vfsops, msdosfs, 0); 867