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 65 #include <msdosfs/bpb.h> 66 #include <msdosfs/bootsect.h> 67 #include <msdosfs/direntry.h> 68 #include <msdosfs/denode.h> 69 #include <msdosfs/msdosfsmount.h> 70 #include <msdosfs/fat.h> 71 72 #define MSDOSFS_DFLTBSIZE 4096 73 74 #if 1 /*def PC98*/ 75 /* 76 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 77 * garbage or a random value :-{ 78 * If you want to use that broken-signatured media, define the 79 * following symbol even though PC/AT. 80 * (ex. mount PC-98 DOS formatted FD on PC/AT) 81 */ 82 #define MSDOSFS_NOCHECKSIG 83 #endif 84 85 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 86 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 87 88 static int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); 89 static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, 90 struct proc *p, struct msdosfs_args *argp)); 91 static int msdosfs_fhtovp __P((struct mount *, struct fid *, 92 struct vnode **)); 93 static int msdosfs_checkexp __P((struct mount *, struct sockaddr *, 94 int *, struct ucred **)); 95 static int msdosfs_mount __P((struct mount *, char *, caddr_t, 96 struct nameidata *, struct proc *)); 97 static int msdosfs_root __P((struct mount *, struct vnode **)); 98 static int msdosfs_statfs __P((struct mount *, struct statfs *, 99 struct proc *)); 100 static int msdosfs_sync __P((struct mount *, int, struct ucred *, 101 struct proc *)); 102 static int msdosfs_unmount __P((struct mount *, int, struct proc *)); 103 static int msdosfs_vptofh __P((struct vnode *, struct fid *)); 104 105 static int 106 update_mp(mp, argp) 107 struct mount *mp; 108 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 #ifndef __FreeBSD__ 128 /* 129 * GEMDOS knows nothing (yet) about win95 130 */ 131 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 132 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 133 #endif 134 135 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 136 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 137 else if (!(pmp->pm_flags & 138 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 139 struct vnode *rootvp; 140 141 /* 142 * Try to divine whether to support Win'95 long filenames 143 */ 144 if (FAT32(pmp)) 145 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 146 else { 147 if ((error = msdosfs_root(mp, &rootvp)) != 0) 148 return error; 149 pmp->pm_flags |= findwin95(VTODE(rootvp)) 150 ? MSDOSFSMNT_LONGNAME 151 : MSDOSFSMNT_SHORTNAME; 152 vput(rootvp); 153 } 154 } 155 return 0; 156 } 157 158 #ifndef __FreeBSD__ 159 int 160 msdosfs_mountroot() 161 { 162 register struct mount *mp; 163 struct proc *p = curproc; /* XXX */ 164 size_t size; 165 int error; 166 struct msdosfs_args args; 167 168 if (root_device->dv_class != DV_DISK) 169 return (ENODEV); 170 171 /* 172 * Get vnodes for swapdev and rootdev. 173 */ 174 if (bdevvp(rootdev, &rootvp)) 175 panic("msdosfs_mountroot: can't setup rootvp"); 176 177 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 178 bzero((char *)mp, (u_long)sizeof(struct mount)); 179 mp->mnt_op = &msdosfs_vfsops; 180 mp->mnt_flag = 0; 181 LIST_INIT(&mp->mnt_vnodelist); 182 183 args.flags = 0; 184 args.uid = 0; 185 args.gid = 0; 186 args.mask = 0777; 187 188 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 189 free(mp, M_MOUNT); 190 return (error); 191 } 192 193 if ((error = update_mp(mp, &args)) != 0) { 194 (void)msdosfs_unmount(mp, 0, p); 195 free(mp, M_MOUNT); 196 return (error); 197 } 198 199 if ((error = vfs_lock(mp)) != 0) { 200 (void)msdosfs_unmount(mp, 0, p); 201 free(mp, M_MOUNT); 202 return (error); 203 } 204 205 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 206 mp->mnt_vnodecovered = NULLVP; 207 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 208 &size); 209 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 210 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 211 &size); 212 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 213 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 214 vfs_unlock(mp); 215 return (0); 216 } 217 #endif 218 219 /* 220 * mp - path - addr in user space of mount point (ie /usr or whatever) 221 * data - addr in user space of mount params including the name of the block 222 * special file to treat as a filesystem. 223 */ 224 static int 225 msdosfs_mount(mp, path, data, ndp, p) 226 struct mount *mp; 227 char *path; 228 caddr_t data; 229 struct nameidata *ndp; 230 struct proc *p; 231 { 232 struct vnode *devvp; /* vnode for blk device to mount */ 233 struct msdosfs_args args; /* will hold data from mount request */ 234 /* msdosfs specific mount control block */ 235 struct msdosfsmount *pmp = NULL; 236 size_t size; 237 int error, flags; 238 mode_t accessmode; 239 240 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 241 if (error) 242 return (error); 243 if (args.magic != MSDOSFS_ARGSMAGIC) 244 args.flags = 0; 245 /* 246 * If updating, check whether changing from read-only to 247 * read/write; if there is no device name, that's all we do. 248 */ 249 if (mp->mnt_flag & MNT_UPDATE) { 250 pmp = VFSTOMSDOSFS(mp); 251 error = 0; 252 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 253 flags = WRITECLOSE; 254 if (mp->mnt_flag & MNT_FORCE) 255 flags |= FORCECLOSE; 256 error = vflush(mp, NULLVP, flags); 257 } 258 if (!error && (mp->mnt_flag & MNT_RELOAD)) 259 /* not yet implemented */ 260 error = EOPNOTSUPP; 261 if (error) 262 return (error); 263 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 264 /* 265 * If upgrade to read-write by non-root, then verify 266 * that user has necessary permissions on the device. 267 */ 268 if (p->p_ucred->cr_uid != 0) { 269 devvp = pmp->pm_devvp; 270 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 271 error = VOP_ACCESS(devvp, VREAD | VWRITE, 272 p->p_ucred, p); 273 if (error) { 274 VOP_UNLOCK(devvp, 0, p); 275 return (error); 276 } 277 VOP_UNLOCK(devvp, 0, p); 278 } 279 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 280 } 281 if (args.fspec == 0) { 282 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 283 if (args.flags & MSDOSFSMNT_MNTOPT) { 284 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 285 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 286 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 287 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 288 } 289 #endif 290 /* 291 * Process export requests. 292 */ 293 return (vfs_export(mp, &pmp->pm_export, &args.export)); 294 } 295 } 296 /* 297 * Not an update, or updating the name: look up the name 298 * and verify that it refers to a sensible block device. 299 */ 300 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 301 error = namei(ndp); 302 if (error) 303 return (error); 304 devvp = ndp->ni_vp; 305 NDFREE(ndp, NDF_ONLY_PNBUF); 306 307 if (!vn_isdisk(devvp, &error)) { 308 vrele(devvp); 309 return (error); 310 } 311 /* 312 * If mount by non-root, then verify that user has necessary 313 * permissions on the device. 314 */ 315 if (p->p_ucred->cr_uid != 0) { 316 accessmode = VREAD; 317 if ((mp->mnt_flag & MNT_RDONLY) == 0) 318 accessmode |= VWRITE; 319 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 320 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 321 if (error) { 322 vput(devvp); 323 return (error); 324 } 325 VOP_UNLOCK(devvp, 0, p); 326 } 327 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 328 error = mountmsdosfs(devvp, mp, p, &args); 329 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 330 pmp = VFSTOMSDOSFS(mp); 331 #endif 332 } else { 333 if (devvp != pmp->pm_devvp) 334 error = EINVAL; /* XXX needs translation */ 335 else 336 vrele(devvp); 337 } 338 if (error) { 339 vrele(devvp); 340 return (error); 341 } 342 343 error = update_mp(mp, &args); 344 if (error) { 345 msdosfs_unmount(mp, MNT_FORCE, p); 346 return error; 347 } 348 349 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 350 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 351 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 352 &size); 353 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 354 (void) msdosfs_statfs(mp, &mp->mnt_stat, p); 355 #ifdef MSDOSFS_DEBUG 356 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 357 #endif 358 return (0); 359 } 360 361 static int 362 mountmsdosfs(devvp, mp, p, argp) 363 struct vnode *devvp; 364 struct mount *mp; 365 struct proc *p; 366 struct msdosfs_args *argp; 367 { 368 struct msdosfsmount *pmp; 369 struct buf *bp; 370 dev_t dev = devvp->v_rdev; 371 #ifndef __FreeBSD__ 372 struct partinfo dpart; 373 int bsize = 0, dtype = 0, tmp; 374 #endif 375 union bootsector *bsp; 376 struct byte_bpb33 *b33; 377 struct byte_bpb50 *b50; 378 struct byte_bpb710 *b710; 379 u_int8_t SecPerClust; 380 u_long clusters; 381 int ronly, error; 382 383 /* 384 * Disallow multiple mounts of the same device. 385 * Disallow mounting of a device that is currently in use 386 * (except for root, which might share swap device for miniroot). 387 * Flush out any old buffers remaining from a previous use. 388 */ 389 error = vfs_mountedon(devvp); 390 if (error) 391 return (error); 392 if (vcount(devvp) > 1 && devvp != rootvp) 393 return (EBUSY); 394 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 395 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); 396 VOP_UNLOCK(devvp, 0, p); 397 if (error) 398 return (error); 399 400 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 401 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 402 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 403 VOP_UNLOCK(devvp, 0, p); 404 if (error) 405 return (error); 406 407 bp = NULL; /* both used in error_exit */ 408 pmp = NULL; 409 410 #ifndef __FreeBSD__ 411 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 412 /* 413 * We need the disklabel to calculate the size of a FAT entry 414 * later on. Also make sure the partition contains a filesystem 415 * of type FS_MSDOS. This doesn't work for floppies, so we have 416 * to check for them too. 417 * 418 * At least some parts of the msdos fs driver seem to assume 419 * that the size of a disk block will always be 512 bytes. 420 * Let's check it... 421 */ 422 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 423 FREAD, NOCRED, p); 424 if (error) 425 goto error_exit; 426 tmp = dpart.part->p_fstype; 427 dtype = dpart.disklab->d_type; 428 bsize = dpart.disklab->d_secsize; 429 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 430 error = EINVAL; 431 goto error_exit; 432 } 433 } 434 #endif 435 436 /* 437 * Read the boot sector of the filesystem, and then check the 438 * boot signature. If not a dos boot sector then error out. 439 * 440 * NOTE: 2048 is a maximum sector size in current... 441 */ 442 error = bread(devvp, 0, 2048, NOCRED, &bp); 443 if (error) 444 goto error_exit; 445 bp->b_flags |= B_AGE; 446 bsp = (union bootsector *)bp->b_data; 447 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 448 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 449 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 450 451 #ifndef __FreeBSD__ 452 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 453 #endif 454 #ifndef MSDOSFS_NOCHECKSIG 455 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 456 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 457 error = EINVAL; 458 goto error_exit; 459 } 460 #endif 461 #ifndef __FreeBSD__ 462 } 463 #endif 464 465 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 466 bzero((caddr_t)pmp, sizeof *pmp); 467 pmp->pm_mountp = mp; 468 469 /* 470 * Compute several useful quantities from the bpb in the 471 * bootsector. Copy in the dos 5 variant of the bpb then fix up 472 * the fields that are different between dos 5 and dos 3.3. 473 */ 474 SecPerClust = b50->bpbSecPerClust; 475 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 476 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 477 pmp->pm_FATs = b50->bpbFATs; 478 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 479 pmp->pm_Sectors = getushort(b50->bpbSectors); 480 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 481 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 482 pmp->pm_Heads = getushort(b50->bpbHeads); 483 pmp->pm_Media = b50->bpbMedia; 484 485 /* calculate the ratio of sector size to DEV_BSIZE */ 486 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 487 488 #ifndef __FreeBSD__ 489 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 490 #endif 491 /* XXX - We should probably check more values here */ 492 if (!pmp->pm_BytesPerSec || !SecPerClust 493 || !pmp->pm_Heads || pmp->pm_Heads > 255 494 #ifdef PC98 495 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 496 #else 497 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 498 #endif 499 error = EINVAL; 500 goto error_exit; 501 } 502 #ifndef __FreeBSD__ 503 } 504 #endif 505 506 if (pmp->pm_Sectors == 0) { 507 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 508 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 509 } else { 510 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 511 pmp->pm_HugeSectors = pmp->pm_Sectors; 512 } 513 if (pmp->pm_HugeSectors > 0xffffffff / 514 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 515 /* 516 * We cannot deal currently with this size of disk 517 * due to fileid limitations (see msdosfs_getattr and 518 * msdosfs_readdir) 519 */ 520 error = EINVAL; 521 printf("mountmsdosfs(): disk too big, sorry\n"); 522 goto error_exit; 523 } 524 525 if (pmp->pm_RootDirEnts == 0) { 526 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 527 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 528 || pmp->pm_Sectors 529 || pmp->pm_FATsecs 530 || getushort(b710->bpbFSVers)) { 531 error = EINVAL; 532 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 533 goto error_exit; 534 } 535 pmp->pm_fatmask = FAT32_MASK; 536 pmp->pm_fatmult = 4; 537 pmp->pm_fatdiv = 1; 538 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 539 if (getushort(b710->bpbExtFlags) & FATMIRROR) 540 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 541 else 542 pmp->pm_flags |= MSDOSFS_FATMIRROR; 543 } else 544 pmp->pm_flags |= MSDOSFS_FATMIRROR; 545 546 /* 547 * Check a few values (could do some more): 548 * - logical sector size: power of 2, >= block size 549 * - sectors per cluster: power of 2, >= 1 550 * - number of sectors: >= 1, <= size of partition 551 */ 552 if ( (SecPerClust == 0) 553 || (SecPerClust & (SecPerClust - 1)) 554 || (pmp->pm_BytesPerSec < DEV_BSIZE) 555 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 556 || (pmp->pm_HugeSectors == 0) 557 ) { 558 error = EINVAL; 559 goto error_exit; 560 } 561 562 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 563 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 564 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 565 SecPerClust *= pmp->pm_BlkPerSec; 566 567 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 568 569 if (FAT32(pmp)) { 570 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 571 pmp->pm_firstcluster = pmp->pm_fatblk 572 + (pmp->pm_FATs * pmp->pm_FATsecs); 573 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 574 } else { 575 pmp->pm_rootdirblk = pmp->pm_fatblk + 576 (pmp->pm_FATs * pmp->pm_FATsecs); 577 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 578 + DEV_BSIZE - 1) 579 / DEV_BSIZE; /* in blocks */ 580 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 581 } 582 583 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 584 SecPerClust + 1; 585 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 586 587 #ifndef __FreeBSD__ 588 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 589 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 590 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 591 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 592 ) { 593 pmp->pm_fatmask = FAT12_MASK; 594 pmp->pm_fatmult = 3; 595 pmp->pm_fatdiv = 2; 596 } else { 597 pmp->pm_fatmask = FAT16_MASK; 598 pmp->pm_fatmult = 2; 599 pmp->pm_fatdiv = 1; 600 } 601 } else 602 #endif 603 if (pmp->pm_fatmask == 0) { 604 if (pmp->pm_maxcluster 605 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 606 /* 607 * This will usually be a floppy disk. This size makes 608 * sure that one fat entry will not be split across 609 * multiple blocks. 610 */ 611 pmp->pm_fatmask = FAT12_MASK; 612 pmp->pm_fatmult = 3; 613 pmp->pm_fatdiv = 2; 614 } else { 615 pmp->pm_fatmask = FAT16_MASK; 616 pmp->pm_fatmult = 2; 617 pmp->pm_fatdiv = 1; 618 } 619 } 620 621 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 622 if (pmp->pm_maxcluster >= clusters) { 623 printf("Warning: number of clusters (%ld) exceeds FAT " 624 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 625 pmp->pm_maxcluster = clusters - 1; 626 } 627 628 629 if (FAT12(pmp)) 630 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 631 else 632 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 633 634 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 635 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 636 637 /* 638 * Compute mask and shift value for isolating cluster relative byte 639 * offsets and cluster numbers from a file offset. 640 */ 641 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 642 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 643 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 644 645 /* 646 * Check for valid cluster size 647 * must be a power of 2 648 */ 649 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 650 error = EINVAL; 651 goto error_exit; 652 } 653 654 /* 655 * Release the bootsector buffer. 656 */ 657 brelse(bp); 658 bp = NULL; 659 660 /* 661 * Check FSInfo. 662 */ 663 if (pmp->pm_fsinfo) { 664 struct fsinfo *fp; 665 666 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 667 NOCRED, &bp)) != 0) 668 goto error_exit; 669 fp = (struct fsinfo *)bp->b_data; 670 if (!bcmp(fp->fsisig1, "RRaA", 4) 671 && !bcmp(fp->fsisig2, "rrAa", 4) 672 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 673 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 674 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 675 else 676 pmp->pm_fsinfo = 0; 677 brelse(bp); 678 bp = NULL; 679 } 680 681 /* 682 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 683 */ 684 685 /* 686 * Allocate memory for the bitmap of allocated clusters, and then 687 * fill it in. 688 */ 689 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 690 / N_INUSEBITS) 691 * sizeof(*pmp->pm_inusemap), 692 M_MSDOSFSFAT, M_WAITOK); 693 694 /* 695 * fillinusemap() needs pm_devvp. 696 */ 697 pmp->pm_dev = dev; 698 pmp->pm_devvp = devvp; 699 700 /* 701 * Have the inuse map filled in. 702 */ 703 if ((error = fillinusemap(pmp)) != 0) 704 goto error_exit; 705 706 /* 707 * If they want fat updates to be synchronous then let them suffer 708 * the performance degradation in exchange for the on disk copy of 709 * the fat being correct just about all the time. I suppose this 710 * would be a good thing to turn on if the kernel is still flakey. 711 */ 712 if (mp->mnt_flag & MNT_SYNCHRONOUS) 713 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 714 715 /* 716 * Finish up. 717 */ 718 if (ronly) 719 pmp->pm_flags |= MSDOSFSMNT_RONLY; 720 else 721 pmp->pm_fmod = 1; 722 mp->mnt_data = (qaddr_t) pmp; 723 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 724 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 725 mp->mnt_flag |= MNT_LOCAL; 726 devvp->v_specmountpoint = mp; 727 728 return 0; 729 730 error_exit: 731 if (bp) 732 brelse(bp); 733 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); 734 if (pmp) { 735 if (pmp->pm_inusemap) 736 free(pmp->pm_inusemap, M_MSDOSFSFAT); 737 free(pmp, M_MSDOSFSMNT); 738 mp->mnt_data = (qaddr_t)0; 739 } 740 return (error); 741 } 742 743 /* 744 * Unmount the filesystem described by mp. 745 */ 746 static int 747 msdosfs_unmount(mp, mntflags, p) 748 struct mount *mp; 749 int mntflags; 750 struct proc *p; 751 { 752 struct msdosfsmount *pmp; 753 int error, flags; 754 755 flags = 0; 756 if (mntflags & MNT_FORCE) 757 flags |= FORCECLOSE; 758 error = vflush(mp, NULLVP, flags); 759 if (error) 760 return error; 761 pmp = VFSTOMSDOSFS(mp); 762 pmp->pm_devvp->v_specmountpoint = NULL; 763 #ifdef MSDOSFS_DEBUG 764 { 765 struct vnode *vp = pmp->pm_devvp; 766 767 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 768 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 769 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 770 printf("id %lu, mount %p, op %p\n", 771 vp->v_id, vp->v_mount, vp->v_op); 772 printf("freef %p, freeb %p, mount %p\n", 773 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 774 vp->v_mount); 775 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 776 TAILQ_FIRST(&vp->v_cleanblkhd), 777 TAILQ_FIRST(&vp->v_dirtyblkhd), 778 vp->v_numoutput, vp->v_type); 779 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 780 vp->v_socket, vp->v_tag, 781 ((u_int *)vp->v_data)[0], 782 ((u_int *)vp->v_data)[1]); 783 } 784 #endif 785 error = VOP_CLOSE(pmp->pm_devvp, 786 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 787 NOCRED, p); 788 vrele(pmp->pm_devvp); 789 free(pmp->pm_inusemap, M_MSDOSFSFAT); 790 free(pmp, M_MSDOSFSMNT); 791 mp->mnt_data = (qaddr_t)0; 792 mp->mnt_flag &= ~MNT_LOCAL; 793 return (error); 794 } 795 796 static int 797 msdosfs_root(mp, vpp) 798 struct mount *mp; 799 struct vnode **vpp; 800 { 801 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 802 struct denode *ndep; 803 int error; 804 805 #ifdef MSDOSFS_DEBUG 806 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 807 #endif 808 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 809 if (error) 810 return (error); 811 *vpp = DETOV(ndep); 812 return (0); 813 } 814 815 static int 816 msdosfs_statfs(mp, sbp, p) 817 struct mount *mp; 818 struct statfs *sbp; 819 struct proc *p; 820 { 821 struct msdosfsmount *pmp; 822 823 pmp = VFSTOMSDOSFS(mp); 824 sbp->f_bsize = pmp->pm_bpcluster; 825 sbp->f_iosize = pmp->pm_bpcluster; 826 sbp->f_blocks = pmp->pm_maxcluster + 1; 827 sbp->f_bfree = pmp->pm_freeclustercount; 828 sbp->f_bavail = pmp->pm_freeclustercount; 829 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 830 sbp->f_ffree = 0; /* what to put in here? */ 831 if (sbp != &mp->mnt_stat) { 832 sbp->f_type = mp->mnt_vfc->vfc_typenum; 833 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 834 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 835 } 836 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 837 return (0); 838 } 839 840 static int 841 msdosfs_sync(mp, waitfor, cred, p) 842 struct mount *mp; 843 int waitfor; 844 struct ucred *cred; 845 struct proc *p; 846 { 847 struct vnode *vp, *nvp; 848 struct denode *dep; 849 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 850 int error, allerror = 0; 851 852 /* 853 * If we ever switch to not updating all of the fats all the time, 854 * this would be the place to update them from the first one. 855 */ 856 if (pmp->pm_fmod != 0) { 857 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 858 panic("msdosfs_sync: rofs mod"); 859 else { 860 /* update fats here */ 861 } 862 } 863 /* 864 * Write back each (modified) denode. 865 */ 866 simple_lock(&mntvnode_slock); 867 loop: 868 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 869 /* 870 * If the vnode that we are about to sync is no longer 871 * associated with this mount point, start over. 872 */ 873 if (vp->v_mount != mp) 874 goto loop; 875 876 simple_lock(&vp->v_interlock); 877 nvp = vp->v_mntvnodes.le_next; 878 dep = VTODE(vp); 879 if (vp->v_type == VNON || 880 ((dep->de_flag & 881 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 882 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 883 simple_unlock(&vp->v_interlock); 884 continue; 885 } 886 simple_unlock(&mntvnode_slock); 887 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 888 if (error) { 889 simple_lock(&mntvnode_slock); 890 if (error == ENOENT) 891 goto loop; 892 continue; 893 } 894 error = VOP_FSYNC(vp, cred, waitfor, p); 895 if (error) 896 allerror = error; 897 VOP_UNLOCK(vp, 0, p); 898 vrele(vp); 899 simple_lock(&mntvnode_slock); 900 } 901 simple_unlock(&mntvnode_slock); 902 903 /* 904 * Flush filesystem control info. 905 */ 906 if (waitfor != MNT_LAZY) { 907 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); 908 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); 909 if (error) 910 allerror = error; 911 VOP_UNLOCK(pmp->pm_devvp, 0, p); 912 } 913 return (allerror); 914 } 915 916 static int 917 msdosfs_fhtovp(mp, fhp, vpp) 918 struct mount *mp; 919 struct fid *fhp; 920 struct vnode **vpp; 921 { 922 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 923 struct defid *defhp = (struct defid *) fhp; 924 struct denode *dep; 925 int error; 926 927 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 928 if (error) { 929 *vpp = NULLVP; 930 return (error); 931 } 932 *vpp = DETOV(dep); 933 return (0); 934 } 935 936 static int 937 msdosfs_checkexp(mp, nam, exflagsp, credanonp) 938 struct mount *mp; 939 struct sockaddr *nam; 940 int *exflagsp; 941 struct ucred **credanonp; 942 { 943 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 944 struct netcred *np; 945 946 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 947 if (np == NULL) 948 return (EACCES); 949 *exflagsp = np->netc_exflags; 950 *credanonp = &np->netc_anon; 951 return (0); 952 } 953 954 static int 955 msdosfs_vptofh(vp, fhp) 956 struct vnode *vp; 957 struct fid *fhp; 958 { 959 struct denode *dep; 960 struct defid *defhp; 961 962 dep = VTODE(vp); 963 defhp = (struct defid *)fhp; 964 defhp->defid_len = sizeof(struct defid); 965 defhp->defid_dirclust = dep->de_dirclust; 966 defhp->defid_dirofs = dep->de_diroffset; 967 /* defhp->defid_gen = dep->de_gen; */ 968 return (0); 969 } 970 971 static struct vfsops msdosfs_vfsops = { 972 msdosfs_mount, 973 vfs_stdstart, 974 msdosfs_unmount, 975 msdosfs_root, 976 vfs_stdquotactl, 977 msdosfs_statfs, 978 msdosfs_sync, 979 vfs_stdvget, 980 msdosfs_fhtovp, 981 msdosfs_checkexp, 982 msdosfs_vptofh, 983 msdosfs_init, 984 msdosfs_uninit, 985 vfs_stdextattrctl, 986 }; 987 988 VFS_SET(msdosfs_vfsops, msdos, 0); 989