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 1.15 2004/05/19 22:53:05 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/namei.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 #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 int msdosfs_fhtovp (struct mount *, struct fid *, 93 struct vnode **); 94 static int msdosfs_checkexp (struct mount *, struct sockaddr *, 95 int *, struct ucred **); 96 static int msdosfs_mount (struct mount *, char *, caddr_t, 97 struct nameidata *, struct thread *); 98 static int msdosfs_root (struct mount *, struct vnode **); 99 static int msdosfs_statfs (struct mount *, struct statfs *, 100 struct thread *); 101 static int msdosfs_sync (struct mount *, int, struct thread *); 102 static int msdosfs_unmount (struct mount *, int, struct thread *); 103 static int msdosfs_vptofh (struct vnode *, struct fid *); 104 105 static int 106 update_mp(struct mount *mp, 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_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 115 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 116 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 117 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 118 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 119 } 120 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 121 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 122 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 123 } 124 125 #ifndef __DragonFly__ 126 /* 127 * GEMDOS knows nothing (yet) about win95 128 */ 129 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 130 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 131 #endif 132 133 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 134 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 135 else if (!(pmp->pm_flags & 136 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 137 struct vnode *rootvp; 138 139 /* 140 * Try to divine whether to support Win'95 long filenames 141 */ 142 if (FAT32(pmp)) 143 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 144 else { 145 if ((error = msdosfs_root(mp, &rootvp)) != 0) 146 return error; 147 pmp->pm_flags |= findwin95(VTODE(rootvp)) 148 ? MSDOSFSMNT_LONGNAME 149 : MSDOSFSMNT_SHORTNAME; 150 vput(rootvp); 151 } 152 } 153 return 0; 154 } 155 156 #ifndef __DragonFly__ 157 int 158 msdosfs_mountroot(void) 159 { 160 struct mount *mp; 161 struct thread *td = curthread; /* XXX */ 162 size_t size; 163 int error; 164 struct msdosfs_args args; 165 166 if (root_device->dv_class != DV_DISK) 167 return (ENODEV); 168 169 /* 170 * Get vnodes for swapdev and rootdev. 171 */ 172 if (bdevvp(rootdev, &rootvp)) 173 panic("msdosfs_mountroot: can't setup rootvp"); 174 175 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 176 bzero((char *)mp, (u_long)sizeof(struct mount)); 177 mp->mnt_op = &msdosfs_vfsops; 178 mp->mnt_flag = 0; 179 TAILQ_INIT(&mp->mnt_nvnodelist); 180 TAILQ_INIT(&mp->mnt_reservedvnlist); 181 182 args.flags = 0; 183 args.uid = 0; 184 args.gid = 0; 185 args.mask = 0777; 186 187 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 188 free(mp, M_MOUNT); 189 return (error); 190 } 191 192 if ((error = update_mp(mp, &args)) != 0) { 193 (void)msdosfs_unmount(mp, 0, p); 194 free(mp, M_MOUNT); 195 return (error); 196 } 197 198 if ((error = vfs_lock(mp)) != 0) { 199 (void)msdosfs_unmount(mp, 0, p); 200 free(mp, M_MOUNT); 201 return (error); 202 } 203 204 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 205 mp->mnt_vnodecovered = NULLVP; 206 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 207 &size); 208 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 209 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 210 &size); 211 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 212 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 213 vfs_unlock(mp); 214 return (0); 215 } 216 #endif 217 218 /* 219 * mp - path - addr in user space of mount point (ie /usr or whatever) 220 * data - addr in user space of mount params including the name of the block 221 * special file to treat as a filesystem. 222 */ 223 static int 224 msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct nameidata *ndp, 225 struct thread *td) 226 { 227 struct vnode *devvp; /* vnode for blk device to mount */ 228 struct msdosfs_args args; /* will hold data from mount request */ 229 /* msdosfs specific mount control block */ 230 struct msdosfsmount *pmp = NULL; 231 size_t size; 232 int error, flags; 233 mode_t accessmode; 234 struct proc *p = td->td_proc; 235 236 KKASSERT(p); 237 238 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 239 if (error) 240 return (error); 241 if (args.magic != MSDOSFS_ARGSMAGIC) 242 args.flags = 0; 243 /* 244 * If updating, check whether changing from read-only to 245 * read/write; if there is no device name, that's all we do. 246 */ 247 if (mp->mnt_flag & MNT_UPDATE) { 248 pmp = VFSTOMSDOSFS(mp); 249 error = 0; 250 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 251 flags = WRITECLOSE; 252 if (mp->mnt_flag & MNT_FORCE) 253 flags |= FORCECLOSE; 254 error = vflush(mp, 0, flags); 255 } 256 if (!error && (mp->mnt_flag & MNT_RELOAD)) 257 /* not yet implemented */ 258 error = EOPNOTSUPP; 259 if (error) 260 return (error); 261 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 262 /* 263 * If upgrade to read-write by non-root, then verify 264 * that user has necessary permissions on the device. 265 */ 266 if (p->p_ucred->cr_uid != 0) { 267 devvp = pmp->pm_devvp; 268 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); 269 error = VOP_ACCESS(devvp, VREAD | VWRITE, 270 p->p_ucred, td); 271 if (error) { 272 VOP_UNLOCK(devvp, NULL, 0, td); 273 return (error); 274 } 275 VOP_UNLOCK(devvp, NULL, 0, td); 276 } 277 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 278 } 279 if (args.fspec == 0) { 280 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 281 if (args.flags & MSDOSFSMNT_MNTOPT) { 282 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 283 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 284 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 285 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 286 } 287 #endif 288 /* 289 * Process export requests. 290 */ 291 return (vfs_export(mp, &pmp->pm_export, &args.export)); 292 } 293 } 294 /* 295 * Not an update, or updating the name: look up the name 296 * and verify that it refers to a sensible block device. 297 */ 298 NDINIT(ndp, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, args.fspec, td); 299 error = namei(ndp); 300 if (error) 301 return (error); 302 devvp = ndp->ni_vp; 303 NDFREE(ndp, NDF_ONLY_PNBUF); 304 305 if (!vn_isdisk(devvp, &error)) { 306 vrele(devvp); 307 return (error); 308 } 309 /* 310 * If mount by non-root, then verify that user has necessary 311 * permissions on the device. 312 */ 313 if (p->p_ucred->cr_uid != 0) { 314 accessmode = VREAD; 315 if ((mp->mnt_flag & MNT_RDONLY) == 0) 316 accessmode |= VWRITE; 317 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); 318 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, td); 319 if (error) { 320 vput(devvp); 321 return (error); 322 } 323 VOP_UNLOCK(devvp, NULL, 0, td); 324 } 325 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 326 error = mountmsdosfs(devvp, mp, td, &args); 327 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 328 pmp = VFSTOMSDOSFS(mp); 329 #endif 330 } else { 331 if (devvp != pmp->pm_devvp) 332 error = EINVAL; /* XXX needs translation */ 333 else 334 vrele(devvp); 335 } 336 if (error) { 337 vrele(devvp); 338 return (error); 339 } 340 341 error = update_mp(mp, &args); 342 if (error) { 343 msdosfs_unmount(mp, MNT_FORCE, td); 344 return error; 345 } 346 347 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 348 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 349 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 350 &size); 351 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 352 (void) msdosfs_statfs(mp, &mp->mnt_stat, td); 353 #ifdef MSDOSFS_DEBUG 354 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 355 #endif 356 return (0); 357 } 358 359 static int 360 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct thread *td, 361 struct msdosfs_args *argp) 362 { 363 struct msdosfsmount *pmp; 364 struct buf *bp; 365 dev_t dev; 366 #ifndef __DragonFly__ 367 struct partinfo dpart; 368 int bsize = 0, dtype = 0, tmp; 369 #endif 370 union bootsector *bsp; 371 struct byte_bpb33 *b33; 372 struct byte_bpb50 *b50; 373 struct byte_bpb710 *b710; 374 u_int8_t SecPerClust; 375 u_long clusters; 376 int ronly, error; 377 378 /* 379 * Disallow multiple mounts of the same device. 380 * Disallow mounting of a device that is currently in use 381 * (except for root, which might share swap device for miniroot). 382 * Flush out any old buffers remaining from a previous use. 383 */ 384 error = vfs_mountedon(devvp); 385 if (error) 386 return (error); 387 if (count_udev(devvp) > 0 && devvp != rootvp) 388 return (EBUSY); 389 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); 390 error = vinvalbuf(devvp, V_SAVE, td, 0, 0); 391 VOP_UNLOCK(devvp, NULL, 0, td); 392 if (error) 393 return (error); 394 395 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 396 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); 397 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td); 398 VOP_UNLOCK(devvp, NULL, 0, td); 399 if (error) 400 return (error); 401 dev = devvp->v_rdev; 402 bp = NULL; /* both used in error_exit */ 403 pmp = NULL; 404 405 #ifndef __DragonFly__ 406 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 407 /* 408 * We need the disklabel to calculate the size of a FAT entry 409 * later on. Also make sure the partition contains a filesystem 410 * of type FS_MSDOS. This doesn't work for floppies, so we have 411 * to check for them too. 412 * 413 * At least some parts of the msdos fs driver seem to assume 414 * that the size of a disk block will always be 512 bytes. 415 * Let's check it... 416 */ 417 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, td); 418 if (error) 419 goto error_exit; 420 tmp = dpart.part->p_fstype; 421 dtype = dpart.disklab->d_type; 422 bsize = dpart.disklab->d_secsize; 423 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 424 error = EINVAL; 425 goto error_exit; 426 } 427 } 428 #endif 429 430 /* 431 * Read the boot sector of the filesystem, and then check the 432 * boot signature. If not a dos boot sector then error out. 433 * 434 * NOTE: 2048 is a maximum sector size in current... 435 */ 436 error = bread(devvp, 0, 2048, &bp); 437 if (error) 438 goto error_exit; 439 bp->b_flags |= B_AGE; 440 bsp = (union bootsector *)bp->b_data; 441 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 442 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 443 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 444 445 #ifndef __DragonFly__ 446 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 447 #endif 448 #ifndef MSDOSFS_NOCHECKSIG 449 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 450 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 451 error = EINVAL; 452 goto error_exit; 453 } 454 #endif 455 #ifndef __DragonFly__ 456 } 457 #endif 458 459 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 460 bzero((caddr_t)pmp, sizeof *pmp); 461 pmp->pm_mountp = mp; 462 463 /* 464 * Compute several useful quantities from the bpb in the 465 * bootsector. Copy in the dos 5 variant of the bpb then fix up 466 * the fields that are different between dos 5 and dos 3.3. 467 */ 468 SecPerClust = b50->bpbSecPerClust; 469 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 470 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 471 pmp->pm_FATs = b50->bpbFATs; 472 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 473 pmp->pm_Sectors = getushort(b50->bpbSectors); 474 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 475 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 476 pmp->pm_Heads = getushort(b50->bpbHeads); 477 pmp->pm_Media = b50->bpbMedia; 478 479 /* calculate the ratio of sector size to DEV_BSIZE */ 480 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 481 482 #ifndef __DragonFly__ 483 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 484 #endif 485 /* XXX - We should probably check more values here */ 486 if (!pmp->pm_BytesPerSec || !SecPerClust 487 || !pmp->pm_Heads 488 #ifdef PC98 489 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 490 #else 491 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 492 #endif 493 error = EINVAL; 494 goto error_exit; 495 } 496 #ifndef __DragonFly__ 497 } 498 #endif 499 500 if (pmp->pm_Sectors == 0) { 501 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 502 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 503 } else { 504 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 505 pmp->pm_HugeSectors = pmp->pm_Sectors; 506 } 507 if (pmp->pm_HugeSectors > 0xffffffff / 508 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 509 /* 510 * We cannot deal currently with this size of disk 511 * due to fileid limitations (see msdosfs_getattr and 512 * msdosfs_readdir) 513 */ 514 error = EINVAL; 515 printf("mountmsdosfs(): disk too big, sorry\n"); 516 goto error_exit; 517 } 518 519 if (pmp->pm_RootDirEnts == 0) { 520 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 521 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 522 || pmp->pm_Sectors 523 || pmp->pm_FATsecs 524 || getushort(b710->bpbFSVers)) { 525 error = EINVAL; 526 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 527 goto error_exit; 528 } 529 pmp->pm_fatmask = FAT32_MASK; 530 pmp->pm_fatmult = 4; 531 pmp->pm_fatdiv = 1; 532 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 533 if (getushort(b710->bpbExtFlags) & FATMIRROR) 534 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 535 else 536 pmp->pm_flags |= MSDOSFS_FATMIRROR; 537 } else 538 pmp->pm_flags |= MSDOSFS_FATMIRROR; 539 540 /* 541 * Check a few values (could do some more): 542 * - logical sector size: power of 2, >= block size 543 * - sectors per cluster: power of 2, >= 1 544 * - number of sectors: >= 1, <= size of partition 545 */ 546 if ( (SecPerClust == 0) 547 || (SecPerClust & (SecPerClust - 1)) 548 || (pmp->pm_BytesPerSec < DEV_BSIZE) 549 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 550 || (pmp->pm_HugeSectors == 0) 551 ) { 552 error = EINVAL; 553 goto error_exit; 554 } 555 556 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 557 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 558 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 559 SecPerClust *= pmp->pm_BlkPerSec; 560 561 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 562 563 if (FAT32(pmp)) { 564 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 565 pmp->pm_firstcluster = pmp->pm_fatblk 566 + (pmp->pm_FATs * pmp->pm_FATsecs); 567 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 568 } else { 569 pmp->pm_rootdirblk = pmp->pm_fatblk + 570 (pmp->pm_FATs * pmp->pm_FATsecs); 571 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 572 + DEV_BSIZE - 1) 573 / DEV_BSIZE; /* in blocks */ 574 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 575 } 576 577 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 578 SecPerClust + 1; 579 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 580 581 #ifndef __DragonFly__ 582 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 583 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 584 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 585 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 586 ) { 587 pmp->pm_fatmask = FAT12_MASK; 588 pmp->pm_fatmult = 3; 589 pmp->pm_fatdiv = 2; 590 } else { 591 pmp->pm_fatmask = FAT16_MASK; 592 pmp->pm_fatmult = 2; 593 pmp->pm_fatdiv = 1; 594 } 595 } else 596 #endif 597 if (pmp->pm_fatmask == 0) { 598 if (pmp->pm_maxcluster 599 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 600 /* 601 * This will usually be a floppy disk. This size makes 602 * sure that one fat entry will not be split across 603 * multiple blocks. 604 */ 605 pmp->pm_fatmask = FAT12_MASK; 606 pmp->pm_fatmult = 3; 607 pmp->pm_fatdiv = 2; 608 } else { 609 pmp->pm_fatmask = FAT16_MASK; 610 pmp->pm_fatmult = 2; 611 pmp->pm_fatdiv = 1; 612 } 613 } 614 615 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 616 if (pmp->pm_maxcluster >= clusters) { 617 printf("Warning: number of clusters (%ld) exceeds FAT " 618 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 619 pmp->pm_maxcluster = clusters - 1; 620 } 621 622 623 if (FAT12(pmp)) 624 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 625 else 626 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 627 628 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 629 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 630 631 /* 632 * Compute mask and shift value for isolating cluster relative byte 633 * offsets and cluster numbers from a file offset. 634 */ 635 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 636 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 637 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 638 639 /* 640 * Check for valid cluster size 641 * must be a power of 2 642 */ 643 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 644 error = EINVAL; 645 goto error_exit; 646 } 647 648 /* 649 * Release the bootsector buffer. 650 */ 651 brelse(bp); 652 bp = NULL; 653 654 /* 655 * Check FSInfo. 656 */ 657 if (pmp->pm_fsinfo) { 658 struct fsinfo *fp; 659 660 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), &bp)) != 0) 661 goto error_exit; 662 fp = (struct fsinfo *)bp->b_data; 663 if (!bcmp(fp->fsisig1, "RRaA", 4) 664 && !bcmp(fp->fsisig2, "rrAa", 4) 665 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 666 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 667 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 668 if (pmp->pm_nxtfree == 0xffffffff) 669 pmp->pm_nxtfree = CLUST_FIRST; 670 } else 671 pmp->pm_fsinfo = 0; 672 brelse(bp); 673 bp = NULL; 674 } 675 676 /* 677 * Check and validate (or perhaps invalidate?) the fsinfo structure? 678 */ 679 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 680 printf( 681 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 682 pmp->pm_nxtfree, pmp->pm_maxcluster); 683 error = EINVAL; 684 goto error_exit; 685 } 686 687 /* 688 * Allocate memory for the bitmap of allocated clusters, and then 689 * fill it in. 690 */ 691 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 692 / N_INUSEBITS) 693 * sizeof(*pmp->pm_inusemap), 694 M_MSDOSFSFAT, M_WAITOK); 695 696 /* 697 * fillinusemap() needs pm_devvp. 698 */ 699 pmp->pm_dev = dev; 700 pmp->pm_devvp = devvp; 701 702 /* 703 * Have the inuse map filled in. 704 */ 705 if ((error = fillinusemap(pmp)) != 0) 706 goto error_exit; 707 708 /* 709 * If they want fat updates to be synchronous then let them suffer 710 * the performance degradation in exchange for the on disk copy of 711 * the fat being correct just about all the time. I suppose this 712 * would be a good thing to turn on if the kernel is still flakey. 713 */ 714 if (mp->mnt_flag & MNT_SYNCHRONOUS) 715 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 716 717 /* 718 * Finish up. 719 */ 720 if (ronly) 721 pmp->pm_flags |= MSDOSFSMNT_RONLY; 722 else 723 pmp->pm_fmod = 1; 724 mp->mnt_data = (qaddr_t) pmp; 725 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 726 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 727 mp->mnt_flag |= MNT_LOCAL; 728 dev->si_mountpoint = mp; 729 730 return 0; 731 732 error_exit: 733 if (bp) 734 brelse(bp); 735 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, td); 736 if (pmp) { 737 if (pmp->pm_inusemap) 738 free(pmp->pm_inusemap, M_MSDOSFSFAT); 739 free(pmp, M_MSDOSFSMNT); 740 mp->mnt_data = (qaddr_t)0; 741 } 742 return (error); 743 } 744 745 /* 746 * Unmount the filesystem described by mp. 747 */ 748 static int 749 msdosfs_unmount(struct mount *mp, int mntflags, struct thread *td) 750 { 751 struct msdosfsmount *pmp; 752 int error, flags; 753 754 flags = 0; 755 if (mntflags & MNT_FORCE) 756 flags |= FORCECLOSE; 757 error = vflush(mp, 0, flags); 758 if (error) 759 return error; 760 pmp = VFSTOMSDOSFS(mp); 761 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 762 #ifdef MSDOSFS_DEBUG 763 { 764 struct vnode *vp = pmp->pm_devvp; 765 766 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 767 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 768 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 769 printf("id %lu, mount %p, op %p\n", 770 vp->v_id, vp->v_mount, vp->v_op); 771 printf("freef %p, freeb %p, mount %p\n", 772 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 773 vp->v_mount); 774 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 775 TAILQ_FIRST(&vp->v_cleanblkhd), 776 TAILQ_FIRST(&vp->v_dirtyblkhd), 777 vp->v_numoutput, vp->v_type); 778 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 779 vp->v_socket, vp->v_tag, 780 ((u_int *)vp->v_data)[0], 781 ((u_int *)vp->v_data)[1]); 782 } 783 #endif 784 error = VOP_CLOSE(pmp->pm_devvp, 785 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 786 td); 787 vrele(pmp->pm_devvp); 788 free(pmp->pm_inusemap, M_MSDOSFSFAT); 789 free(pmp, M_MSDOSFSMNT); 790 mp->mnt_data = (qaddr_t)0; 791 mp->mnt_flag &= ~MNT_LOCAL; 792 return (error); 793 } 794 795 static int 796 msdosfs_root(struct mount *mp, struct vnode **vpp) 797 { 798 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 799 struct denode *ndep; 800 int error; 801 802 #ifdef MSDOSFS_DEBUG 803 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 804 #endif 805 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 806 if (error) 807 return (error); 808 *vpp = DETOV(ndep); 809 return (0); 810 } 811 812 static int 813 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 814 { 815 struct msdosfsmount *pmp; 816 817 pmp = VFSTOMSDOSFS(mp); 818 sbp->f_bsize = pmp->pm_bpcluster; 819 sbp->f_iosize = pmp->pm_bpcluster; 820 sbp->f_blocks = pmp->pm_maxcluster + 1; 821 sbp->f_bfree = pmp->pm_freeclustercount; 822 sbp->f_bavail = pmp->pm_freeclustercount; 823 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 824 sbp->f_ffree = 0; /* what to put in here? */ 825 if (sbp != &mp->mnt_stat) { 826 sbp->f_type = mp->mnt_vfc->vfc_typenum; 827 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 828 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 829 } 830 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 831 return (0); 832 } 833 834 struct scaninfo { 835 int rescan; 836 int allerror; 837 int waitfor; 838 thread_t td; 839 }; 840 841 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, 842 lwkt_tokref_t vlock, void *data); 843 844 static int 845 msdosfs_sync(struct mount *mp, int waitfor, struct thread *td) 846 { 847 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 848 struct scaninfo scaninfo; 849 int error; 850 851 /* 852 * If we ever switch to not updating all of the fats all the time, 853 * this would be the place to update them from the first one. 854 */ 855 if (pmp->pm_fmod != 0) { 856 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 857 panic("msdosfs_sync: rofs mod"); 858 else { 859 /* update fats here */ 860 } 861 } 862 /* 863 * Write back each (modified) denode. 864 */ 865 scaninfo.allerror = 0; 866 scaninfo.rescan = 1; 867 scaninfo.td = td; 868 while (scaninfo.rescan) { 869 scaninfo.rescan = 0; 870 vmntvnodescan(mp, NULL, msdosfs_sync_scan, &scaninfo); 871 } 872 873 /* 874 * Flush filesystem control info. 875 */ 876 if (waitfor != MNT_LAZY) { 877 vn_lock(pmp->pm_devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); 878 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, td)) != 0) 879 scaninfo.allerror = error; 880 VOP_UNLOCK(pmp->pm_devvp, NULL, 0, td); 881 } 882 return (scaninfo.allerror); 883 } 884 885 static int 886 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, 887 lwkt_tokref_t vlock, void *data) 888 { 889 struct scaninfo *info = data; 890 struct denode *dep; 891 int error; 892 893 dep = VTODE(vp); 894 if (vp->v_type == VNON || 895 ((dep->de_flag & 896 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 897 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || info->waitfor == MNT_LAZY))) { 898 lwkt_reltoken(vlock); 899 return(0); 900 } 901 error = vget(vp, vlock, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, info->td); 902 if (error) { 903 if (error == ENOENT) 904 info->rescan = 1; 905 return(0); 906 } 907 if ((error = VOP_FSYNC(vp, info->waitfor, info->td)) != 0) 908 info->allerror = error; 909 VOP_UNLOCK(vp, NULL, 0, info->td); 910 vrele(vp); 911 return(0); 912 } 913 914 static int 915 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 916 { 917 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 918 struct defid *defhp = (struct defid *) fhp; 919 struct denode *dep; 920 int error; 921 922 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 923 if (error) { 924 *vpp = NULLVP; 925 return (error); 926 } 927 *vpp = DETOV(dep); 928 return (0); 929 } 930 931 static int 932 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 933 struct ucred **credanonp) 934 { 935 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 936 struct netcred *np; 937 938 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 939 if (np == NULL) 940 return (EACCES); 941 *exflagsp = np->netc_exflags; 942 *credanonp = &np->netc_anon; 943 return (0); 944 } 945 946 static int 947 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 948 { 949 struct denode *dep; 950 struct defid *defhp; 951 952 dep = VTODE(vp); 953 defhp = (struct defid *)fhp; 954 defhp->defid_len = sizeof(struct defid); 955 defhp->defid_dirclust = dep->de_dirclust; 956 defhp->defid_dirofs = dep->de_diroffset; 957 /* defhp->defid_gen = dep->de_gen; */ 958 return (0); 959 } 960 961 static struct vfsops msdosfs_vfsops = { 962 msdosfs_mount, 963 vfs_stdstart, 964 msdosfs_unmount, 965 msdosfs_root, 966 vfs_stdquotactl, 967 msdosfs_statfs, 968 msdosfs_sync, 969 vfs_stdvget, 970 msdosfs_fhtovp, 971 msdosfs_checkexp, 972 msdosfs_vptofh, 973 msdosfs_init, 974 msdosfs_uninit, 975 vfs_stdextattrctl, 976 }; 977 978 VFS_SET(msdosfs_vfsops, msdos, 0); 979