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 1.52 2008/09/17 21:44:24 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 vnode *, 95 struct fid *, 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 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 128 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 129 else if (!(pmp->pm_flags & 130 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 131 struct vnode *rootvp; 132 133 /* 134 * Try to divine whether to support Win'95 long filenames 135 */ 136 if (FAT32(pmp)) 137 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 138 else { 139 if ((error = msdosfs_root(mp, &rootvp)) != 0) 140 return error; 141 pmp->pm_flags |= findwin95(VTODE(rootvp)) 142 ? MSDOSFSMNT_LONGNAME 143 : MSDOSFSMNT_SHORTNAME; 144 vput(rootvp); 145 } 146 } 147 return 0; 148 } 149 150 /* 151 * mp - path - addr in user space of mount point (ie /usr or whatever) 152 * data - addr in user space of mount params including the name of the block 153 * special file to treat as a filesystem. 154 */ 155 static int 156 msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 157 { 158 struct vnode *devvp; /* vnode for blk device to mount */ 159 struct msdosfs_args args; /* will hold data from mount request */ 160 /* msdosfs specific mount control block */ 161 struct msdosfsmount *pmp = NULL; 162 size_t size; 163 int error, flags; 164 mode_t accessmode; 165 struct nlookupdata nd; 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 if (error == 0) { 185 devvp = pmp->pm_devvp; 186 VOP_OPEN(devvp, FREAD, FSCRED, NULL); 187 VOP_CLOSE(devvp, FREAD|FWRITE); 188 pmp->pm_flags |= MSDOSFSMNT_RONLY; 189 } 190 } 191 if (!error && (mp->mnt_flag & MNT_RELOAD)) 192 /* not yet implemented */ 193 error = EOPNOTSUPP; 194 if (error) 195 return (error); 196 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 197 /* 198 * If upgrade to read-write by non-root, then verify 199 * that user has necessary permissions on the device. 200 */ 201 devvp = pmp->pm_devvp; 202 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 203 if (cred->cr_uid != 0) { 204 error = VOP_ACCESS(devvp, VREAD | VWRITE, cred); 205 if (error) { 206 vn_unlock(devvp); 207 return (error); 208 } 209 } 210 VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL); 211 VOP_CLOSE(devvp, FREAD); 212 vn_unlock(devvp); 213 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 214 } 215 if (args.fspec == 0) { 216 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 217 if (args.flags & MSDOSFSMNT_MNTOPT) { 218 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 219 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 220 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 221 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 222 } 223 #endif 224 /* 225 * Process export requests. 226 */ 227 return (vfs_export(mp, &pmp->pm_export, &args.export)); 228 } 229 } 230 /* 231 * Not an update, or updating the name: look up the name 232 * and verify that it refers to a sensible block device. 233 */ 234 devvp = NULL; 235 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); 236 if (error == 0) 237 error = nlookup(&nd); 238 if (error == 0) 239 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 240 nlookup_done(&nd); 241 if (error) 242 return (error); 243 244 if (!vn_isdisk(devvp, &error)) { 245 vrele(devvp); 246 return (error); 247 } 248 /* 249 * If mount by non-root, then verify that user has necessary 250 * permissions on the device. 251 */ 252 if (cred->cr_uid != 0) { 253 accessmode = VREAD; 254 if ((mp->mnt_flag & MNT_RDONLY) == 0) 255 accessmode |= VWRITE; 256 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 257 error = VOP_ACCESS(devvp, accessmode, cred); 258 if (error) { 259 vput(devvp); 260 return (error); 261 } 262 vn_unlock(devvp); 263 } 264 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 265 error = mountmsdosfs(devvp, mp, &args); 266 #ifdef MSDOSFS_DEBUG /* only needed for the kprintf below */ 267 pmp = VFSTOMSDOSFS(mp); 268 #endif 269 } else { 270 if (devvp != pmp->pm_devvp) 271 error = EINVAL; /* XXX needs translation */ 272 else 273 vrele(devvp); 274 } 275 if (error) { 276 vrele(devvp); 277 return (error); 278 } 279 280 error = update_mp(mp, &args); 281 if (error) { 282 msdosfs_unmount(mp, MNT_FORCE); 283 return error; 284 } 285 286 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 287 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 288 msdosfs_statfs(mp, &mp->mnt_stat, cred); 289 #ifdef MSDOSFS_DEBUG 290 kprintf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 291 #endif 292 return (0); 293 } 294 295 static int 296 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct msdosfs_args *argp) 297 { 298 struct msdosfsmount *pmp; 299 struct buf *bp; 300 cdev_t dev; 301 union bootsector *bsp; 302 struct byte_bpb33 *b33; 303 struct byte_bpb50 *b50; 304 struct byte_bpb710 *b710; 305 u_int8_t SecPerClust; 306 u_long clusters; 307 int ronly, error; 308 309 /* 310 * Disallow multiple mounts of the same device. 311 * Disallow mounting of a device that is currently in use 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 (count_udev(devvp->v_umajor, devvp->v_uminor) > 0) 318 return (EBUSY); 319 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 320 error = vinvalbuf(devvp, V_SAVE, 0, 0); 321 vn_unlock(devvp); 322 if (error) 323 return (error); 324 325 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 326 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 327 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL); 328 vn_unlock(devvp); 329 if (error) 330 return (error); 331 dev = devvp->v_rdev; 332 bp = NULL; /* both used in error_exit */ 333 pmp = NULL; 334 335 /* 336 * Read the boot sector of the filesystem, and then check the 337 * boot signature. If not a dos boot sector then error out. 338 * 339 * NOTE: 2048 is a maximum sector size in current... 340 */ 341 error = bread(devvp, 0, 2048, &bp); 342 if (error) 343 goto error_exit; 344 bp->b_flags |= B_AGE; 345 bsp = (union bootsector *)bp->b_data; 346 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 347 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 348 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 349 350 #ifndef MSDOSFS_NOCHECKSIG 351 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 352 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 353 error = EINVAL; 354 goto error_exit; 355 } 356 #endif 357 358 pmp = kmalloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 359 pmp->pm_mountp = mp; 360 361 /* 362 * Compute several useful quantities from the bpb in the 363 * bootsector. Copy in the dos 5 variant of the bpb then fix up 364 * the fields that are different between dos 5 and dos 3.3. 365 */ 366 SecPerClust = b50->bpbSecPerClust; 367 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 368 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 369 pmp->pm_FATs = b50->bpbFATs; 370 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 371 pmp->pm_Sectors = getushort(b50->bpbSectors); 372 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 373 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 374 pmp->pm_Heads = getushort(b50->bpbHeads); 375 pmp->pm_Media = b50->bpbMedia; 376 377 /* calculate the ratio of sector size to DEV_BSIZE */ 378 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 379 380 /* 381 * We don't check pm_Heads nor pm_SecPerTrack, because 382 * these may not be set for EFI file systems. We don't 383 * use these anyway, so we're unaffected if they are 384 * invalid. 385 */ 386 if (!pmp->pm_BytesPerSec || !SecPerClust) { 387 error = EINVAL; 388 goto error_exit; 389 } 390 391 if (pmp->pm_Sectors == 0) { 392 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 393 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 394 } else { 395 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 396 pmp->pm_HugeSectors = pmp->pm_Sectors; 397 } 398 399 if (pmp->pm_RootDirEnts == 0) { 400 if (pmp->pm_Sectors 401 || pmp->pm_FATsecs 402 || getushort(b710->bpbFSVers)) { 403 error = EINVAL; 404 kprintf("mountmsdosfs(): bad FAT32 filesystem\n"); 405 goto error_exit; 406 } 407 pmp->pm_fatmask = FAT32_MASK; 408 pmp->pm_fatmult = 4; 409 pmp->pm_fatdiv = 1; 410 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 411 if (getushort(b710->bpbExtFlags) & FATMIRROR) 412 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 413 else 414 pmp->pm_flags |= MSDOSFS_FATMIRROR; 415 } else 416 pmp->pm_flags |= MSDOSFS_FATMIRROR; 417 418 /* 419 * Check a few values (could do some more): 420 * - logical sector size: power of 2, >= block size 421 * - sectors per cluster: power of 2, >= 1 422 * - number of sectors: >= 1, <= size of partition 423 */ 424 if ( (SecPerClust == 0) 425 || (SecPerClust & (SecPerClust - 1)) 426 || (pmp->pm_BytesPerSec < DEV_BSIZE) 427 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 428 || (pmp->pm_HugeSectors == 0) 429 ) { 430 error = EINVAL; 431 goto error_exit; 432 } 433 434 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 435 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 436 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 437 SecPerClust *= pmp->pm_BlkPerSec; 438 439 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 440 441 if (FAT32(pmp)) { 442 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 443 pmp->pm_firstcluster = pmp->pm_fatblk 444 + (pmp->pm_FATs * pmp->pm_FATsecs); 445 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 446 } else { 447 pmp->pm_rootdirblk = pmp->pm_fatblk + 448 (pmp->pm_FATs * pmp->pm_FATsecs); 449 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 450 + DEV_BSIZE - 1) 451 / DEV_BSIZE; /* in blocks */ 452 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 453 } 454 455 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 456 SecPerClust + 1; 457 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 458 459 if (pmp->pm_fatmask == 0) { 460 if (pmp->pm_maxcluster 461 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 462 /* 463 * This will usually be a floppy disk. This size makes 464 * sure that one fat entry will not be split across 465 * multiple blocks. 466 */ 467 pmp->pm_fatmask = FAT12_MASK; 468 pmp->pm_fatmult = 3; 469 pmp->pm_fatdiv = 2; 470 } else { 471 pmp->pm_fatmask = FAT16_MASK; 472 pmp->pm_fatmult = 2; 473 pmp->pm_fatdiv = 1; 474 } 475 } 476 477 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 478 if (pmp->pm_maxcluster >= clusters) { 479 kprintf("Warning: number of clusters (%ld) exceeds FAT " 480 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 481 pmp->pm_maxcluster = clusters - 1; 482 } 483 484 485 if (FAT12(pmp)) 486 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 487 else 488 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 489 490 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 491 pmp->pm_bnshift = DEV_BSHIFT; 492 493 /* 494 * Compute mask and shift value for isolating cluster relative byte 495 * offsets and cluster numbers from a file offset. 496 */ 497 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 498 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 499 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 500 501 /* 502 * Check for valid cluster size 503 * must be a power of 2 504 */ 505 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 506 error = EINVAL; 507 goto error_exit; 508 } 509 510 /* 511 * Release the bootsector buffer. 512 */ 513 brelse(bp); 514 bp = NULL; 515 516 /* 517 * Check FSInfo. 518 */ 519 if (pmp->pm_fsinfo) { 520 struct fsinfo *fp; 521 522 if ((error = bread(devvp, de_bntodoff(pmp, pmp->pm_fsinfo), fsi_size(pmp), &bp)) != 0) 523 goto error_exit; 524 fp = (struct fsinfo *)bp->b_data; 525 if (!bcmp(fp->fsisig1, "RRaA", 4) 526 && !bcmp(fp->fsisig2, "rrAa", 4) 527 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 528 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 529 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 530 if (pmp->pm_nxtfree == 0xffffffff) 531 pmp->pm_nxtfree = CLUST_FIRST; 532 } else 533 pmp->pm_fsinfo = 0; 534 brelse(bp); 535 bp = NULL; 536 } 537 538 /* 539 * Check and validate (or perhaps invalidate?) the fsinfo structure? 540 */ 541 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 542 kprintf( 543 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 544 pmp->pm_nxtfree, pmp->pm_maxcluster); 545 error = EINVAL; 546 goto error_exit; 547 } 548 549 /* 550 * Allocate memory for the bitmap of allocated clusters, and then 551 * fill it in. 552 */ 553 pmp->pm_inusemap = kmalloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 554 / N_INUSEBITS) 555 * sizeof(*pmp->pm_inusemap), 556 M_MSDOSFSFAT, M_WAITOK); 557 558 /* 559 * fillinusemap() needs pm_devvp. 560 */ 561 pmp->pm_dev = dev; 562 pmp->pm_devvp = devvp; 563 564 /* 565 * Have the inuse map filled in. 566 */ 567 if ((error = fillinusemap(pmp)) != 0) 568 goto error_exit; 569 570 /* 571 * If they want fat updates to be synchronous then let them suffer 572 * the performance degradation in exchange for the on disk copy of 573 * the fat being correct just about all the time. I suppose this 574 * would be a good thing to turn on if the kernel is still flakey. 575 */ 576 if (mp->mnt_flag & MNT_SYNCHRONOUS) 577 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 578 579 /* 580 * Finish up. 581 */ 582 if (ronly) 583 pmp->pm_flags |= MSDOSFSMNT_RONLY; 584 else 585 pmp->pm_fmod = 1; 586 mp->mnt_data = (qaddr_t) pmp; 587 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 588 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 589 mp->mnt_flag |= MNT_LOCAL; 590 vfs_add_vnodeops(mp, &msdosfs_vnode_vops, &mp->mnt_vn_norm_ops); 591 dev->si_mountpoint = mp; 592 593 return 0; 594 595 error_exit: 596 if (bp) 597 brelse(bp); 598 VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE); 599 if (pmp) { 600 if (pmp->pm_inusemap) 601 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 602 kfree(pmp, M_MSDOSFSMNT); 603 mp->mnt_data = (qaddr_t)0; 604 } 605 return (error); 606 } 607 608 /* 609 * Unmount the filesystem described by mp. 610 */ 611 static int 612 msdosfs_unmount(struct mount *mp, int mntflags) 613 { 614 struct msdosfsmount *pmp; 615 int error, flags; 616 617 flags = 0; 618 if (mntflags & MNT_FORCE) 619 flags |= FORCECLOSE; 620 error = vflush(mp, 0, flags); 621 if (error) 622 return error; 623 pmp = VFSTOMSDOSFS(mp); 624 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 625 #ifdef MSDOSFS_DEBUG 626 { 627 struct vnode *vp = pmp->pm_devvp; 628 629 kprintf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 630 kprintf("flag %08x, sysrefs %d, writecount %d, auxrefs %d\n", 631 vp->v_flag, vp->v_sysref.refcnt, 632 vp->v_writecount, vp->v_auxrefs); 633 kprintf("mount %p, op %p\n", vp->v_mount, vp->v_ops); 634 kprintf("mount %p\n", vp->v_mount); 635 kprintf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 636 RB_ROOT(&vp->v_rbclean_tree), 637 RB_ROOT(&vp->v_rbdirty_tree), 638 vp->v_track_write.bk_active, vp->v_type); 639 kprintf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 640 vp->v_socket, vp->v_tag, 641 ((u_int *)vp->v_data)[0], 642 ((u_int *)vp->v_data)[1]); 643 } 644 #endif 645 error = VOP_CLOSE(pmp->pm_devvp, 646 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE); 647 vrele(pmp->pm_devvp); 648 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 649 kfree(pmp, M_MSDOSFSMNT); 650 mp->mnt_data = (qaddr_t)0; 651 mp->mnt_flag &= ~MNT_LOCAL; 652 return (error); 653 } 654 655 static int 656 msdosfs_root(struct mount *mp, struct vnode **vpp) 657 { 658 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 659 struct denode *ndep; 660 int error; 661 662 #ifdef MSDOSFS_DEBUG 663 kprintf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 664 #endif 665 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 666 if (error) 667 return (error); 668 *vpp = DETOV(ndep); 669 return (0); 670 } 671 672 static int 673 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 674 { 675 struct msdosfsmount *pmp; 676 677 pmp = VFSTOMSDOSFS(mp); 678 sbp->f_bsize = pmp->pm_bpcluster; 679 sbp->f_iosize = pmp->pm_bpcluster; 680 sbp->f_blocks = pmp->pm_maxcluster + 1; 681 sbp->f_bfree = pmp->pm_freeclustercount; 682 sbp->f_bavail = pmp->pm_freeclustercount; 683 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 684 sbp->f_ffree = 0; /* what to put in here? */ 685 if (sbp != &mp->mnt_stat) { 686 sbp->f_type = mp->mnt_vfc->vfc_typenum; 687 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 688 } 689 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 690 return (0); 691 } 692 693 struct scaninfo { 694 int rescan; 695 int allerror; 696 int waitfor; 697 }; 698 699 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data); 700 701 static int 702 msdosfs_sync(struct mount *mp, int waitfor) 703 { 704 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 705 struct scaninfo scaninfo; 706 int error; 707 708 /* 709 * If we ever switch to not updating all of the fats all the time, 710 * this would be the place to update them from the first one. 711 */ 712 if (pmp->pm_fmod != 0) { 713 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 714 panic("msdosfs_sync: rofs mod"); 715 else { 716 /* update fats here */ 717 } 718 } 719 /* 720 * Write back each (modified) denode. 721 */ 722 scaninfo.allerror = 0; 723 scaninfo.rescan = 1; 724 while (scaninfo.rescan) { 725 scaninfo.rescan = 0; 726 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo); 727 } 728 729 /* 730 * Flush filesystem control info. 731 */ 732 if (waitfor != MNT_LAZY) { 733 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 734 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor)) != 0) 735 scaninfo.allerror = error; 736 vn_unlock(pmp->pm_devvp); 737 } 738 return (scaninfo.allerror); 739 } 740 741 static int 742 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) 743 { 744 struct scaninfo *info = data; 745 struct denode *dep; 746 int error; 747 748 dep = VTODE(vp); 749 if (vp->v_type == VNON || vp->v_type == VBAD || 750 ((dep->de_flag & 751 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 752 (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) { 753 return(0); 754 } 755 if ((error = VOP_FSYNC(vp, info->waitfor)) != 0) 756 info->allerror = error; 757 return(0); 758 } 759 760 static int 761 msdosfs_fhtovp(struct mount *mp, struct vnode *rootvp, 762 struct fid *fhp, struct vnode **vpp) 763 { 764 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 765 struct defid *defhp = (struct defid *) fhp; 766 struct denode *dep; 767 int error; 768 769 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 770 if (error) { 771 *vpp = NULLVP; 772 return (error); 773 } 774 *vpp = DETOV(dep); 775 return (0); 776 } 777 778 static int 779 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 780 struct ucred **credanonp) 781 { 782 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 783 struct netcred *np; 784 785 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 786 if (np == NULL) 787 return (EACCES); 788 *exflagsp = np->netc_exflags; 789 *credanonp = &np->netc_anon; 790 return (0); 791 } 792 793 static int 794 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 795 { 796 struct denode *dep; 797 struct defid *defhp; 798 799 dep = VTODE(vp); 800 defhp = (struct defid *)fhp; 801 defhp->defid_len = sizeof(struct defid); 802 defhp->defid_dirclust = dep->de_dirclust; 803 defhp->defid_dirofs = dep->de_diroffset; 804 /* defhp->defid_gen = dep->de_gen; */ 805 return (0); 806 } 807 808 static struct vfsops msdosfs_vfsops = { 809 .vfs_mount = msdosfs_mount, 810 .vfs_unmount = msdosfs_unmount, 811 .vfs_root = msdosfs_root, 812 .vfs_statfs = msdosfs_statfs, 813 .vfs_sync = msdosfs_sync, 814 .vfs_fhtovp = msdosfs_fhtovp, 815 .vfs_checkexp = msdosfs_checkexp, 816 .vfs_vptofh = msdosfs_vptofh, 817 .vfs_init = msdosfs_init, 818 .vfs_uninit = msdosfs_uninit 819 }; 820 821 VFS_SET(msdosfs_vfsops, msdos, 0); 822