msdosfs_vfsops.c revision 120492
1/* $FreeBSD: head/sys/fs/msdosfs/msdosfs_vfsops.c 120492 2003-09-26 20:26:25Z fjoe $ */ 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#define MSDOSFS_DFLTBSIZE 4096 75 76#if 1 /*def PC98*/ 77/* 78 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 79 * garbage or a random value :-{ 80 * If you want to use that broken-signatured media, define the 81 * following symbol even though PC/AT. 82 * (ex. mount PC-98 DOS formatted FD on PC/AT) 83 */ 84#define MSDOSFS_NOCHECKSIG 85#endif 86 87MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 88static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 89 90struct iconv_functions *msdosfs_iconv = NULL; 91 92static int update_mp(struct mount *mp, struct msdosfs_args *argp); 93static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 94 struct thread *td, struct msdosfs_args *argp); 95static vfs_fhtovp_t msdosfs_fhtovp; 96static vfs_mount_t msdosfs_mount; 97static vfs_root_t msdosfs_root; 98static vfs_statfs_t msdosfs_statfs; 99static vfs_sync_t msdosfs_sync; 100static vfs_unmount_t msdosfs_unmount; 101static vfs_vptofh_t msdosfs_vptofh; 102 103static int 104update_mp(mp, argp) 105 struct mount *mp; 106 struct msdosfs_args *argp; 107{ 108 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 109 int error; 110 111 pmp->pm_gid = argp->gid; 112 pmp->pm_uid = argp->uid; 113 pmp->pm_mask = argp->mask & ALLPERMS; 114 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 115 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 116 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 117 msdosfs_iconv->open(argp->cs_win, argp->cs_local , &pmp->pm_u2w); 118 msdosfs_iconv->open(argp->cs_local, argp->cs_win , &pmp->pm_w2u); 119 msdosfs_iconv->open(argp->cs_dos, argp->cs_local , &pmp->pm_u2d); 120 msdosfs_iconv->open(argp->cs_local, argp->cs_dos , &pmp->pm_d2u); 121 } else { 122 pmp->pm_w2u = NULL; 123 pmp->pm_u2w = NULL; 124 pmp->pm_d2u = NULL; 125 pmp->pm_u2d = NULL; 126 } 127 128 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 129 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 130 else if (!(pmp->pm_flags & 131 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 132 struct vnode *rootvp; 133 134 /* 135 * Try to divine whether to support Win'95 long filenames 136 */ 137 if (FAT32(pmp)) 138 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 139 else { 140 if ((error = msdosfs_root(mp, &rootvp)) != 0) 141 return error; 142 pmp->pm_flags |= findwin95(VTODE(rootvp)) 143 ? MSDOSFSMNT_LONGNAME 144 : MSDOSFSMNT_SHORTNAME; 145 vput(rootvp); 146 } 147 } 148 return 0; 149} 150 151/* 152 * mp - path - addr in user space of mount point (ie /usr or whatever) 153 * data - addr in user space of mount params including the name of the block 154 * special file to treat as a filesystem. 155 */ 156static int 157msdosfs_mount(mp, path, data, ndp, td) 158 struct mount *mp; 159 char *path; 160 caddr_t data; 161 struct nameidata *ndp; 162 struct thread *td; 163{ 164 struct vnode *devvp; /* vnode for blk device to mount */ 165 struct msdosfs_args args; /* will hold data from mount request */ 166 /* msdosfs specific mount control block */ 167 struct msdosfsmount *pmp = NULL; 168 size_t size; 169 int error, flags; 170 mode_t accessmode; 171 172 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 173 if (error) 174 return (error); 175 if (args.magic != MSDOSFS_ARGSMAGIC) 176 args.flags = 0; 177 /* 178 * If updating, check whether changing from read-only to 179 * read/write; if there is no device name, that's all we do. 180 */ 181 if (mp->mnt_flag & MNT_UPDATE) { 182 pmp = VFSTOMSDOSFS(mp); 183 error = 0; 184 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 185 flags = WRITECLOSE; 186 if (mp->mnt_flag & MNT_FORCE) 187 flags |= FORCECLOSE; 188 error = vflush(mp, 0, flags); 189 } 190 if (!error && (mp->mnt_flag & MNT_RELOAD)) 191 /* not yet implemented */ 192 error = EOPNOTSUPP; 193 if (error) 194 return (error); 195 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 196 /* 197 * If upgrade to read-write by non-root, then verify 198 * that user has necessary permissions on the device. 199 */ 200 if (suser(td)) { 201 devvp = pmp->pm_devvp; 202 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 203 error = VOP_ACCESS(devvp, VREAD | VWRITE, 204 td->td_ucred, td); 205 if (error) { 206 VOP_UNLOCK(devvp, 0, td); 207 return (error); 208 } 209 VOP_UNLOCK(devvp, 0, td); 210 } 211 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 212 } 213 if (args.fspec == 0) { 214#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 215 if (args.flags & MSDOSFSMNT_MNTOPT) { 216 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 217 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 218 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 219 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 220 } 221#endif 222 /* 223 * Process export requests. 224 */ 225 return (vfs_export(mp, &args.export)); 226 } 227 } 228 /* 229 * Not an update, or updating the name: look up the name 230 * and verify that it refers to a sensible block device. 231 */ 232 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td); 233 error = namei(ndp); 234 if (error) 235 return (error); 236 devvp = ndp->ni_vp; 237 NDFREE(ndp, NDF_ONLY_PNBUF); 238 239 if (!vn_isdisk(devvp, &error)) { 240 vrele(devvp); 241 return (error); 242 } 243 /* 244 * If mount by non-root, then verify that user has necessary 245 * permissions on the device. 246 */ 247 if (suser(td)) { 248 accessmode = VREAD; 249 if ((mp->mnt_flag & MNT_RDONLY) == 0) 250 accessmode |= VWRITE; 251 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 252 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 253 if (error) { 254 vput(devvp); 255 return (error); 256 } 257 VOP_UNLOCK(devvp, 0, td); 258 } 259 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 260 error = mountmsdosfs(devvp, mp, td, &args); 261#ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 262 pmp = VFSTOMSDOSFS(mp); 263#endif 264 } else { 265 if (devvp != pmp->pm_devvp) 266 error = EINVAL; /* XXX needs translation */ 267 else 268 vrele(devvp); 269 } 270 if (error) { 271 vrele(devvp); 272 return (error); 273 } 274 275 error = update_mp(mp, &args); 276 if (error) { 277 msdosfs_unmount(mp, MNT_FORCE, td); 278 return error; 279 } 280 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 281 &size); 282 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 283 (void) msdosfs_statfs(mp, &mp->mnt_stat, td); 284#ifdef MSDOSFS_DEBUG 285 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 286#endif 287 return (0); 288} 289 290static int 291mountmsdosfs(devvp, mp, td, argp) 292 struct vnode *devvp; 293 struct mount *mp; 294 struct thread *td; 295 struct msdosfs_args *argp; 296{ 297 struct msdosfsmount *pmp; 298 struct buf *bp; 299 dev_t dev = devvp->v_rdev; 300 union bootsector *bsp; 301 struct byte_bpb33 *b33; 302 struct byte_bpb50 *b50; 303 struct byte_bpb710 *b710; 304 u_int8_t SecPerClust; 305 u_long clusters; 306 int ronly, error; 307 308 /* 309 * Disallow multiple mounts of the same device. 310 * Disallow mounting of a device that is currently in use 311 * (except for root, which might share swap device for miniroot). 312 * Flush out any old buffers remaining from a previous use. 313 */ 314 error = vfs_mountedon(devvp); 315 if (error) 316 return (error); 317 if (vcount(devvp) > 1 && devvp != rootvp) 318 return (EBUSY); 319 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 320 error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0); 321 VOP_UNLOCK(devvp, 0, td); 322 if (error) 323 return (error); 324 325 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 326 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 327 /* 328 * XXX Open the device with write access even if the filesystem 329 * is read-only: someone may remount it read-write later, and 330 * we don't VOP_OPEN the device again in that case. 331 */ 332#ifdef notyet 333 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td, -1); 334#else 335 error = VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, td, -1); 336#endif 337 VOP_UNLOCK(devvp, 0, td); 338 if (error) 339 return (error); 340 341 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, NOCRED, &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.bsBPB; 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 = malloc(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 /* XXX - We should probably check more values here */ 394 if (!pmp->pm_BytesPerSec || !SecPerClust 395 || !pmp->pm_Heads || pmp->pm_Heads > 255 396#ifdef PC98 397 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 398#else 399 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 400#endif 401 error = EINVAL; 402 goto error_exit; 403 } 404 405 if (pmp->pm_Sectors == 0) { 406 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 407 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 408 } else { 409 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 410 pmp->pm_HugeSectors = pmp->pm_Sectors; 411 } 412 if (pmp->pm_HugeSectors > 0xffffffff / 413 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 414 /* 415 * We cannot deal currently with this size of disk 416 * due to fileid limitations (see msdosfs_getattr and 417 * msdosfs_readdir) 418 */ 419 error = EINVAL; 420 printf("mountmsdosfs(): disk too big, sorry\n"); 421 goto error_exit; 422 } 423 424 if (pmp->pm_RootDirEnts == 0) { 425 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 426 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 427 || pmp->pm_Sectors 428 || pmp->pm_FATsecs 429 || getushort(b710->bpbFSVers)) { 430 error = EINVAL; 431 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 432 goto error_exit; 433 } 434 pmp->pm_fatmask = FAT32_MASK; 435 pmp->pm_fatmult = 4; 436 pmp->pm_fatdiv = 1; 437 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 438 if (getushort(b710->bpbExtFlags) & FATMIRROR) 439 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 440 else 441 pmp->pm_flags |= MSDOSFS_FATMIRROR; 442 } else 443 pmp->pm_flags |= MSDOSFS_FATMIRROR; 444 445 /* 446 * Check a few values (could do some more): 447 * - logical sector size: power of 2, >= block size 448 * - sectors per cluster: power of 2, >= 1 449 * - number of sectors: >= 1, <= size of partition 450 * - number of FAT sectors: >= 1 451 */ 452 if ( (SecPerClust == 0) 453 || (SecPerClust & (SecPerClust - 1)) 454 || (pmp->pm_BytesPerSec < DEV_BSIZE) 455 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 456 || (pmp->pm_HugeSectors == 0) 457 || (pmp->pm_FATsecs == 0) 458 ) { 459 error = EINVAL; 460 goto error_exit; 461 } 462 463 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 464 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 465 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 466 SecPerClust *= pmp->pm_BlkPerSec; 467 468 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 469 470 if (FAT32(pmp)) { 471 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 472 pmp->pm_firstcluster = pmp->pm_fatblk 473 + (pmp->pm_FATs * pmp->pm_FATsecs); 474 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 475 } else { 476 pmp->pm_rootdirblk = pmp->pm_fatblk + 477 (pmp->pm_FATs * pmp->pm_FATsecs); 478 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 479 + DEV_BSIZE - 1) 480 / DEV_BSIZE; /* in blocks */ 481 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 482 } 483 484 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 485 SecPerClust + 1; 486 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 487 488 if (pmp->pm_fatmask == 0) { 489 if (pmp->pm_maxcluster 490 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 491 /* 492 * This will usually be a floppy disk. This size makes 493 * sure that one fat entry will not be split across 494 * multiple blocks. 495 */ 496 pmp->pm_fatmask = FAT12_MASK; 497 pmp->pm_fatmult = 3; 498 pmp->pm_fatdiv = 2; 499 } else { 500 pmp->pm_fatmask = FAT16_MASK; 501 pmp->pm_fatmult = 2; 502 pmp->pm_fatdiv = 1; 503 } 504 } 505 506 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 507 if (pmp->pm_maxcluster >= clusters) { 508 printf("Warning: number of clusters (%ld) exceeds FAT " 509 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 510 pmp->pm_maxcluster = clusters - 1; 511 } 512 513 514 if (FAT12(pmp)) 515 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 516 else 517 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 518 519 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 520 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 521 522 /* 523 * Compute mask and shift value for isolating cluster relative byte 524 * offsets and cluster numbers from a file offset. 525 */ 526 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 527 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 528 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 529 530 /* 531 * Check for valid cluster size 532 * must be a power of 2 533 */ 534 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 535 error = EINVAL; 536 goto error_exit; 537 } 538 539 /* 540 * Release the bootsector buffer. 541 */ 542 brelse(bp); 543 bp = NULL; 544 545 /* 546 * Check FSInfo. 547 */ 548 if (pmp->pm_fsinfo) { 549 struct fsinfo *fp; 550 551 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 552 NOCRED, &bp)) != 0) 553 goto error_exit; 554 fp = (struct fsinfo *)bp->b_data; 555 if (!bcmp(fp->fsisig1, "RRaA", 4) 556 && !bcmp(fp->fsisig2, "rrAa", 4) 557 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 558 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 559 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 560 else 561 pmp->pm_fsinfo = 0; 562 brelse(bp); 563 bp = NULL; 564 } 565 566 /* 567 * Check and validate (or perhaps invalidate?) the fsinfo structure? 568 */ 569 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 570 printf( 571 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 572 pmp->pm_nxtfree, pmp->pm_maxcluster); 573 error = EINVAL; 574 goto error_exit; 575 } 576 577 /* 578 * Allocate memory for the bitmap of allocated clusters, and then 579 * fill it in. 580 */ 581 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 582 / N_INUSEBITS) 583 * sizeof(*pmp->pm_inusemap), 584 M_MSDOSFSFAT, M_WAITOK); 585 586 /* 587 * fillinusemap() needs pm_devvp. 588 */ 589 pmp->pm_dev = dev; 590 pmp->pm_devvp = devvp; 591 592 /* 593 * Have the inuse map filled in. 594 */ 595 if ((error = fillinusemap(pmp)) != 0) 596 goto error_exit; 597 598 /* 599 * If they want fat updates to be synchronous then let them suffer 600 * the performance degradation in exchange for the on disk copy of 601 * the fat being correct just about all the time. I suppose this 602 * would be a good thing to turn on if the kernel is still flakey. 603 */ 604 if (mp->mnt_flag & MNT_SYNCHRONOUS) 605 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 606 607 /* 608 * Finish up. 609 */ 610 if (ronly) 611 pmp->pm_flags |= MSDOSFSMNT_RONLY; 612 else 613 pmp->pm_fmod = 1; 614 mp->mnt_data = (qaddr_t) pmp; 615 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 616 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 617 mp->mnt_flag |= MNT_LOCAL; 618 devvp->v_rdev->si_mountpoint = mp; 619 620 return 0; 621 622error_exit: 623 if (bp) 624 brelse(bp); 625 /* XXX See comment at VOP_OPEN call */ 626#ifdef notyet 627 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, td); 628#else 629 (void) VOP_CLOSE(devvp, FREAD | FWRITE, NOCRED, td); 630#endif 631 if (pmp) { 632 if (pmp->pm_inusemap) 633 free(pmp->pm_inusemap, M_MSDOSFSFAT); 634 free(pmp, M_MSDOSFSMNT); 635 mp->mnt_data = (qaddr_t)0; 636 } 637 return (error); 638} 639 640/* 641 * Unmount the filesystem described by mp. 642 */ 643static int 644msdosfs_unmount(mp, mntflags, td) 645 struct mount *mp; 646 int mntflags; 647 struct thread *td; 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 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 660 if (pmp->pm_w2u) 661 msdosfs_iconv->close(pmp->pm_w2u); 662 if (pmp->pm_u2w) 663 msdosfs_iconv->close(pmp->pm_u2w); 664 if (pmp->pm_d2u) 665 msdosfs_iconv->close(pmp->pm_d2u); 666 if (pmp->pm_u2d) 667 msdosfs_iconv->close(pmp->pm_u2d); 668 } 669 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 670#ifdef MSDOSFS_DEBUG 671 { 672 struct vnode *vp = pmp->pm_devvp; 673 674 VI_LOCK(vp); 675 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 676 printf("iflag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 677 vp->vi_flag, vp->v_usecount, vp->v_writecount, 678 vp->v_holdcnt); 679 printf("id %lu, mount %p, op %p\n", 680 vp->v_id, vp->v_mount, vp->v_op); 681 printf("freef %p, freeb %p, mount %p\n", 682 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 683 vp->v_mount); 684 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 685 TAILQ_FIRST(&vp->v_cleanblkhd), 686 TAILQ_FIRST(&vp->v_dirtyblkhd), 687 vp->v_numoutput, vp->v_type); 688 printf("union %p, tag %s, data[0] %08x, data[1] %08x\n", 689 vp->v_socket, vp->v_tag, 690 ((u_int *)vp->v_data)[0], 691 ((u_int *)vp->v_data)[1]); 692 VI_UNLOCK(vp); 693 } 694#endif 695 /* XXX See comment at VOP_OPEN call */ 696#ifdef notyet 697 error = VOP_CLOSE(pmp->pm_devvp, 698 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 699 NOCRED, td); 700#else 701 error = VOP_CLOSE(pmp->pm_devvp, FREAD | FWRITE, NOCRED, td); 702#endif 703 vrele(pmp->pm_devvp); 704 free(pmp->pm_inusemap, M_MSDOSFSFAT); 705 free(pmp, M_MSDOSFSMNT); 706 mp->mnt_data = (qaddr_t)0; 707 mp->mnt_flag &= ~MNT_LOCAL; 708 return (error); 709} 710 711static int 712msdosfs_root(mp, vpp) 713 struct mount *mp; 714 struct vnode **vpp; 715{ 716 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 717 struct denode *ndep; 718 int error; 719 720#ifdef MSDOSFS_DEBUG 721 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 722#endif 723 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 724 if (error) 725 return (error); 726 *vpp = DETOV(ndep); 727 return (0); 728} 729 730static int 731msdosfs_statfs(mp, sbp, td) 732 struct mount *mp; 733 struct statfs *sbp; 734 struct thread *td; 735{ 736 struct msdosfsmount *pmp; 737 738 pmp = VFSTOMSDOSFS(mp); 739 sbp->f_bsize = pmp->pm_bpcluster; 740 sbp->f_iosize = pmp->pm_bpcluster; 741 sbp->f_blocks = pmp->pm_maxcluster + 1; 742 sbp->f_bfree = pmp->pm_freeclustercount; 743 sbp->f_bavail = pmp->pm_freeclustercount; 744 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 745 sbp->f_ffree = 0; /* what to put in here? */ 746 if (sbp != &mp->mnt_stat) { 747 sbp->f_type = mp->mnt_vfc->vfc_typenum; 748 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 749 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 750 } 751 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 752 return (0); 753} 754 755static int 756msdosfs_sync(mp, waitfor, cred, td) 757 struct mount *mp; 758 int waitfor; 759 struct ucred *cred; 760 struct thread *td; 761{ 762 struct vnode *vp, *nvp; 763 struct denode *dep; 764 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 765 int error, allerror = 0; 766 767 /* 768 * If we ever switch to not updating all of the fats all the time, 769 * this would be the place to update them from the first one. 770 */ 771 if (pmp->pm_fmod != 0) { 772 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 773 panic("msdosfs_sync: rofs mod"); 774 else { 775 /* update fats here */ 776 } 777 } 778 /* 779 * Write back each (modified) denode. 780 */ 781 mtx_lock(&mntvnode_mtx); 782loop: 783 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) { 784 /* 785 * If the vnode that we are about to sync is no longer 786 * associated with this mount point, start over. 787 */ 788 if (vp->v_mount != mp) 789 goto loop; 790 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 791 792 mtx_unlock(&mntvnode_mtx); 793 VI_LOCK(vp); 794 dep = VTODE(vp); 795 if (vp->v_type == VNON || 796 ((dep->de_flag & 797 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 798 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 799 VI_UNLOCK(vp); 800 mtx_lock(&mntvnode_mtx); 801 continue; 802 } 803 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 804 if (error) { 805 mtx_lock(&mntvnode_mtx); 806 if (error == ENOENT) 807 goto loop; 808 continue; 809 } 810 error = VOP_FSYNC(vp, cred, waitfor, td); 811 if (error) 812 allerror = error; 813 VOP_UNLOCK(vp, 0, td); 814 vrele(vp); 815 mtx_lock(&mntvnode_mtx); 816 } 817 mtx_unlock(&mntvnode_mtx); 818 819 /* 820 * Flush filesystem control info. 821 */ 822 if (waitfor != MNT_LAZY) { 823 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 824 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, td); 825 if (error) 826 allerror = error; 827 VOP_UNLOCK(pmp->pm_devvp, 0, td); 828 } 829 return (allerror); 830} 831 832static int 833msdosfs_fhtovp(mp, fhp, vpp) 834 struct mount *mp; 835 struct fid *fhp; 836 struct vnode **vpp; 837{ 838 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 839 struct defid *defhp = (struct defid *) fhp; 840 struct denode *dep; 841 int error; 842 843 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 844 if (error) { 845 *vpp = NULLVP; 846 return (error); 847 } 848 *vpp = DETOV(dep); 849 return (0); 850} 851 852static int 853msdosfs_vptofh(vp, fhp) 854 struct vnode *vp; 855 struct fid *fhp; 856{ 857 struct denode *dep; 858 struct defid *defhp; 859 860 dep = VTODE(vp); 861 defhp = (struct defid *)fhp; 862 defhp->defid_len = sizeof(struct defid); 863 defhp->defid_dirclust = dep->de_dirclust; 864 defhp->defid_dirofs = dep->de_diroffset; 865 /* defhp->defid_gen = dep->de_gen; */ 866 return (0); 867} 868 869static struct vfsops msdosfs_vfsops = { 870 .vfs_fhtovp = msdosfs_fhtovp, 871 .vfs_init = msdosfs_init, 872 .vfs_mount = msdosfs_mount, 873 .vfs_root = msdosfs_root, 874 .vfs_statfs = msdosfs_statfs, 875 .vfs_sync = msdosfs_sync, 876 .vfs_uninit = msdosfs_uninit, 877 .vfs_unmount = msdosfs_unmount, 878 .vfs_vptofh = msdosfs_vptofh, 879}; 880 881VFS_SET(msdosfs_vfsops, msdosfs, 0); 882MODULE_VERSION(msdosfs, 1); 883