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 1.18 2004/08/17 18:57:34 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 extern struct vnodeopv_entry_desc msdosfs_vnodeop_entries[]; 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 thread *td, struct msdosfs_args *argp); 94 static int msdosfs_fhtovp (struct mount *, struct fid *, 95 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 nameidata *, struct thread *); 100 static int msdosfs_root (struct mount *, struct vnode **); 101 static int msdosfs_statfs (struct mount *, struct statfs *, 102 struct thread *); 103 static int msdosfs_sync (struct mount *, int, struct thread *); 104 static int msdosfs_unmount (struct mount *, int, struct thread *); 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 #ifndef __DragonFly__ 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 __DragonFly__ 159 int 160 msdosfs_mountroot(void) 161 { 162 struct mount *mp; 163 struct thread *td = curthread; /* 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 TAILQ_INIT(&mp->mnt_nvnodelist); 182 TAILQ_INIT(&mp->mnt_reservedvnlist); 183 184 args.flags = 0; 185 args.uid = 0; 186 args.gid = 0; 187 args.mask = 0777; 188 189 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 190 free(mp, M_MOUNT); 191 return (error); 192 } 193 194 if ((error = update_mp(mp, &args)) != 0) { 195 (void)msdosfs_unmount(mp, 0, p); 196 free(mp, M_MOUNT); 197 return (error); 198 } 199 200 if ((error = vfs_lock(mp)) != 0) { 201 (void)msdosfs_unmount(mp, 0, p); 202 free(mp, M_MOUNT); 203 return (error); 204 } 205 206 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 207 mp->mnt_vnodecovered = NULLVP; 208 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 209 &size); 210 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 211 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 212 &size); 213 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 214 215 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 216 vfs_unlock(mp); 217 return (0); 218 } 219 #endif 220 221 /* 222 * mp - path - addr in user space of mount point (ie /usr or whatever) 223 * data - addr in user space of mount params including the name of the block 224 * special file to treat as a filesystem. 225 */ 226 static int 227 msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct nameidata *ndp, 228 struct thread *td) 229 { 230 struct vnode *devvp; /* vnode for blk device to mount */ 231 struct msdosfs_args args; /* will hold data from mount request */ 232 /* msdosfs specific mount control block */ 233 struct msdosfsmount *pmp = NULL; 234 size_t size; 235 int error, flags; 236 mode_t accessmode; 237 struct proc *p = td->td_proc; 238 239 KKASSERT(p); 240 241 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 242 if (error) 243 return (error); 244 if (args.magic != MSDOSFS_ARGSMAGIC) 245 args.flags = 0; 246 /* 247 * If updating, check whether changing from read-only to 248 * read/write; if there is no device name, that's all we do. 249 */ 250 if (mp->mnt_flag & MNT_UPDATE) { 251 pmp = VFSTOMSDOSFS(mp); 252 error = 0; 253 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 254 flags = WRITECLOSE; 255 if (mp->mnt_flag & MNT_FORCE) 256 flags |= FORCECLOSE; 257 error = vflush(mp, 0, flags); 258 } 259 if (!error && (mp->mnt_flag & MNT_RELOAD)) 260 /* not yet implemented */ 261 error = EOPNOTSUPP; 262 if (error) 263 return (error); 264 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 265 /* 266 * If upgrade to read-write by non-root, then verify 267 * that user has necessary permissions on the device. 268 */ 269 if (p->p_ucred->cr_uid != 0) { 270 devvp = pmp->pm_devvp; 271 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); 272 error = VOP_ACCESS(devvp, VREAD | VWRITE, 273 p->p_ucred, td); 274 if (error) { 275 VOP_UNLOCK(devvp, NULL, 0, td); 276 return (error); 277 } 278 VOP_UNLOCK(devvp, NULL, 0, td); 279 } 280 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 281 } 282 if (args.fspec == 0) { 283 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 284 if (args.flags & MSDOSFSMNT_MNTOPT) { 285 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 286 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 287 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 288 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 289 } 290 #endif 291 /* 292 * Process export requests. 293 */ 294 return (vfs_export(mp, &pmp->pm_export, &args.export)); 295 } 296 } 297 /* 298 * Not an update, or updating the name: look up the name 299 * and verify that it refers to a sensible block device. 300 */ 301 NDINIT(ndp, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, args.fspec, td); 302 error = namei(ndp); 303 if (error) 304 return (error); 305 devvp = ndp->ni_vp; 306 NDFREE(ndp, NDF_ONLY_PNBUF); 307 308 if (!vn_isdisk(devvp, &error)) { 309 vrele(devvp); 310 return (error); 311 } 312 /* 313 * If mount by non-root, then verify that user has necessary 314 * permissions on the device. 315 */ 316 if (p->p_ucred->cr_uid != 0) { 317 accessmode = VREAD; 318 if ((mp->mnt_flag & MNT_RDONLY) == 0) 319 accessmode |= VWRITE; 320 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); 321 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, td); 322 if (error) { 323 vput(devvp); 324 return (error); 325 } 326 VOP_UNLOCK(devvp, NULL, 0, td); 327 } 328 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 329 error = mountmsdosfs(devvp, mp, td, &args); 330 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 331 pmp = VFSTOMSDOSFS(mp); 332 #endif 333 } else { 334 if (devvp != pmp->pm_devvp) 335 error = EINVAL; /* XXX needs translation */ 336 else 337 vrele(devvp); 338 } 339 if (error) { 340 vrele(devvp); 341 return (error); 342 } 343 344 error = update_mp(mp, &args); 345 if (error) { 346 msdosfs_unmount(mp, MNT_FORCE, td); 347 return error; 348 } 349 350 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 351 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 352 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 353 &size); 354 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 355 (void) msdosfs_statfs(mp, &mp->mnt_stat, td); 356 #ifdef MSDOSFS_DEBUG 357 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 358 #endif 359 return (0); 360 } 361 362 static int 363 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct thread *td, 364 struct msdosfs_args *argp) 365 { 366 struct msdosfsmount *pmp; 367 struct buf *bp; 368 dev_t dev; 369 #ifndef __DragonFly__ 370 struct partinfo dpart; 371 int bsize = 0, dtype = 0, tmp; 372 #endif 373 union bootsector *bsp; 374 struct byte_bpb33 *b33; 375 struct byte_bpb50 *b50; 376 struct byte_bpb710 *b710; 377 u_int8_t SecPerClust; 378 u_long clusters; 379 int ronly, error; 380 381 /* 382 * Disallow multiple mounts of the same device. 383 * Disallow mounting of a device that is currently in use 384 * (except for root, which might share swap device for miniroot). 385 * Flush out any old buffers remaining from a previous use. 386 */ 387 error = vfs_mountedon(devvp); 388 if (error) 389 return (error); 390 if (count_udev(devvp->v_udev) > 0 && devvp != rootvp) 391 return (EBUSY); 392 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); 393 error = vinvalbuf(devvp, V_SAVE, td, 0, 0); 394 VOP_UNLOCK(devvp, NULL, 0, td); 395 if (error) 396 return (error); 397 398 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 399 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); 400 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td); 401 VOP_UNLOCK(devvp, NULL, 0, td); 402 if (error) 403 return (error); 404 dev = devvp->v_rdev; 405 bp = NULL; /* both used in error_exit */ 406 pmp = NULL; 407 408 #ifndef __DragonFly__ 409 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 410 /* 411 * We need the disklabel to calculate the size of a FAT entry 412 * later on. Also make sure the partition contains a filesystem 413 * of type FS_MSDOS. This doesn't work for floppies, so we have 414 * to check for them too. 415 * 416 * At least some parts of the msdos fs driver seem to assume 417 * that the size of a disk block will always be 512 bytes. 418 * Let's check it... 419 */ 420 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, td); 421 if (error) 422 goto error_exit; 423 tmp = dpart.part->p_fstype; 424 dtype = dpart.disklab->d_type; 425 bsize = dpart.disklab->d_secsize; 426 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 427 error = EINVAL; 428 goto error_exit; 429 } 430 } 431 #endif 432 433 /* 434 * Read the boot sector of the filesystem, and then check the 435 * boot signature. If not a dos boot sector then error out. 436 * 437 * NOTE: 2048 is a maximum sector size in current... 438 */ 439 error = bread(devvp, 0, 2048, &bp); 440 if (error) 441 goto error_exit; 442 bp->b_flags |= B_AGE; 443 bsp = (union bootsector *)bp->b_data; 444 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 445 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 446 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 447 448 #ifndef __DragonFly__ 449 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 450 #endif 451 #ifndef MSDOSFS_NOCHECKSIG 452 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 453 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 454 error = EINVAL; 455 goto error_exit; 456 } 457 #endif 458 #ifndef __DragonFly__ 459 } 460 #endif 461 462 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 463 bzero((caddr_t)pmp, sizeof *pmp); 464 pmp->pm_mountp = mp; 465 466 /* 467 * Compute several useful quantities from the bpb in the 468 * bootsector. Copy in the dos 5 variant of the bpb then fix up 469 * the fields that are different between dos 5 and dos 3.3. 470 */ 471 SecPerClust = b50->bpbSecPerClust; 472 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 473 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 474 pmp->pm_FATs = b50->bpbFATs; 475 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 476 pmp->pm_Sectors = getushort(b50->bpbSectors); 477 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 478 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 479 pmp->pm_Heads = getushort(b50->bpbHeads); 480 pmp->pm_Media = b50->bpbMedia; 481 482 /* calculate the ratio of sector size to DEV_BSIZE */ 483 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 484 485 #ifndef __DragonFly__ 486 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 487 #endif 488 /* XXX - We should probably check more values here */ 489 if (!pmp->pm_BytesPerSec || !SecPerClust 490 || !pmp->pm_Heads 491 #ifdef PC98 492 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 493 #else 494 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 495 #endif 496 error = EINVAL; 497 goto error_exit; 498 } 499 #ifndef __DragonFly__ 500 } 501 #endif 502 503 if (pmp->pm_Sectors == 0) { 504 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 505 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 506 } else { 507 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 508 pmp->pm_HugeSectors = pmp->pm_Sectors; 509 } 510 if (pmp->pm_HugeSectors > 0xffffffff / 511 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 512 /* 513 * We cannot deal currently with this size of disk 514 * due to fileid limitations (see msdosfs_getattr and 515 * msdosfs_readdir) 516 */ 517 error = EINVAL; 518 printf("mountmsdosfs(): disk too big, sorry\n"); 519 goto error_exit; 520 } 521 522 if (pmp->pm_RootDirEnts == 0) { 523 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 524 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 525 || pmp->pm_Sectors 526 || pmp->pm_FATsecs 527 || getushort(b710->bpbFSVers)) { 528 error = EINVAL; 529 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 530 goto error_exit; 531 } 532 pmp->pm_fatmask = FAT32_MASK; 533 pmp->pm_fatmult = 4; 534 pmp->pm_fatdiv = 1; 535 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 536 if (getushort(b710->bpbExtFlags) & FATMIRROR) 537 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 538 else 539 pmp->pm_flags |= MSDOSFS_FATMIRROR; 540 } else 541 pmp->pm_flags |= MSDOSFS_FATMIRROR; 542 543 /* 544 * Check a few values (could do some more): 545 * - logical sector size: power of 2, >= block size 546 * - sectors per cluster: power of 2, >= 1 547 * - number of sectors: >= 1, <= size of partition 548 */ 549 if ( (SecPerClust == 0) 550 || (SecPerClust & (SecPerClust - 1)) 551 || (pmp->pm_BytesPerSec < DEV_BSIZE) 552 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 553 || (pmp->pm_HugeSectors == 0) 554 ) { 555 error = EINVAL; 556 goto error_exit; 557 } 558 559 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 560 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 561 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 562 SecPerClust *= pmp->pm_BlkPerSec; 563 564 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 565 566 if (FAT32(pmp)) { 567 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 568 pmp->pm_firstcluster = pmp->pm_fatblk 569 + (pmp->pm_FATs * pmp->pm_FATsecs); 570 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 571 } else { 572 pmp->pm_rootdirblk = pmp->pm_fatblk + 573 (pmp->pm_FATs * pmp->pm_FATsecs); 574 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 575 + DEV_BSIZE - 1) 576 / DEV_BSIZE; /* in blocks */ 577 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 578 } 579 580 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 581 SecPerClust + 1; 582 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 583 584 #ifndef __DragonFly__ 585 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 586 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 587 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 588 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 589 ) { 590 pmp->pm_fatmask = FAT12_MASK; 591 pmp->pm_fatmult = 3; 592 pmp->pm_fatdiv = 2; 593 } else { 594 pmp->pm_fatmask = FAT16_MASK; 595 pmp->pm_fatmult = 2; 596 pmp->pm_fatdiv = 1; 597 } 598 } else 599 #endif 600 if (pmp->pm_fatmask == 0) { 601 if (pmp->pm_maxcluster 602 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 603 /* 604 * This will usually be a floppy disk. This size makes 605 * sure that one fat entry will not be split across 606 * multiple blocks. 607 */ 608 pmp->pm_fatmask = FAT12_MASK; 609 pmp->pm_fatmult = 3; 610 pmp->pm_fatdiv = 2; 611 } else { 612 pmp->pm_fatmask = FAT16_MASK; 613 pmp->pm_fatmult = 2; 614 pmp->pm_fatdiv = 1; 615 } 616 } 617 618 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 619 if (pmp->pm_maxcluster >= clusters) { 620 printf("Warning: number of clusters (%ld) exceeds FAT " 621 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 622 pmp->pm_maxcluster = clusters - 1; 623 } 624 625 626 if (FAT12(pmp)) 627 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 628 else 629 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 630 631 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 632 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 633 634 /* 635 * Compute mask and shift value for isolating cluster relative byte 636 * offsets and cluster numbers from a file offset. 637 */ 638 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 639 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 640 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 641 642 /* 643 * Check for valid cluster size 644 * must be a power of 2 645 */ 646 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 647 error = EINVAL; 648 goto error_exit; 649 } 650 651 /* 652 * Release the bootsector buffer. 653 */ 654 brelse(bp); 655 bp = NULL; 656 657 /* 658 * Check FSInfo. 659 */ 660 if (pmp->pm_fsinfo) { 661 struct fsinfo *fp; 662 663 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), &bp)) != 0) 664 goto error_exit; 665 fp = (struct fsinfo *)bp->b_data; 666 if (!bcmp(fp->fsisig1, "RRaA", 4) 667 && !bcmp(fp->fsisig2, "rrAa", 4) 668 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 669 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 670 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 671 if (pmp->pm_nxtfree == 0xffffffff) 672 pmp->pm_nxtfree = CLUST_FIRST; 673 } else 674 pmp->pm_fsinfo = 0; 675 brelse(bp); 676 bp = NULL; 677 } 678 679 /* 680 * Check and validate (or perhaps invalidate?) the fsinfo structure? 681 */ 682 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 683 printf( 684 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 685 pmp->pm_nxtfree, pmp->pm_maxcluster); 686 error = EINVAL; 687 goto error_exit; 688 } 689 690 /* 691 * Allocate memory for the bitmap of allocated clusters, and then 692 * fill it in. 693 */ 694 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 695 / N_INUSEBITS) 696 * sizeof(*pmp->pm_inusemap), 697 M_MSDOSFSFAT, M_WAITOK); 698 699 /* 700 * fillinusemap() needs pm_devvp. 701 */ 702 pmp->pm_dev = dev; 703 pmp->pm_devvp = devvp; 704 705 /* 706 * Have the inuse map filled in. 707 */ 708 if ((error = fillinusemap(pmp)) != 0) 709 goto error_exit; 710 711 /* 712 * If they want fat updates to be synchronous then let them suffer 713 * the performance degradation in exchange for the on disk copy of 714 * the fat being correct just about all the time. I suppose this 715 * would be a good thing to turn on if the kernel is still flakey. 716 */ 717 if (mp->mnt_flag & MNT_SYNCHRONOUS) 718 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 719 720 /* 721 * Finish up. 722 */ 723 if (ronly) 724 pmp->pm_flags |= MSDOSFSMNT_RONLY; 725 else 726 pmp->pm_fmod = 1; 727 mp->mnt_data = (qaddr_t) pmp; 728 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 729 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 730 mp->mnt_flag |= MNT_LOCAL; 731 vfs_add_vnodeops(&mp->mnt_vn_ops, msdosfs_vnodeop_entries); 732 dev->si_mountpoint = mp; 733 734 return 0; 735 736 error_exit: 737 if (bp) 738 brelse(bp); 739 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, td); 740 if (pmp) { 741 if (pmp->pm_inusemap) 742 free(pmp->pm_inusemap, M_MSDOSFSFAT); 743 free(pmp, M_MSDOSFSMNT); 744 mp->mnt_data = (qaddr_t)0; 745 } 746 return (error); 747 } 748 749 /* 750 * Unmount the filesystem described by mp. 751 */ 752 static int 753 msdosfs_unmount(struct mount *mp, int mntflags, struct thread *td) 754 { 755 struct msdosfsmount *pmp; 756 int error, flags; 757 758 flags = 0; 759 if (mntflags & MNT_FORCE) 760 flags |= FORCECLOSE; 761 error = vflush(mp, 0, flags); 762 if (error) 763 return error; 764 pmp = VFSTOMSDOSFS(mp); 765 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 766 #ifdef MSDOSFS_DEBUG 767 { 768 struct vnode *vp = pmp->pm_devvp; 769 770 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 771 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 772 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 773 printf("id %lu, mount %p, op %p\n", 774 vp->v_id, vp->v_mount, vp->v_op); 775 printf("freef %p, freeb %p, mount %p\n", 776 TAILQ_NEXT(vp, v_freelist), TAILQ_PREV(vp, v_freelist), 777 vp->v_mount); 778 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 779 TAILQ_FIRST(&vp->v_cleanblkhd), 780 TAILQ_FIRST(&vp->v_dirtyblkhd), 781 vp->v_numoutput, vp->v_type); 782 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 783 vp->v_socket, vp->v_tag, 784 ((u_int *)vp->v_data)[0], 785 ((u_int *)vp->v_data)[1]); 786 } 787 #endif 788 error = VOP_CLOSE(pmp->pm_devvp, 789 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 790 td); 791 vrele(pmp->pm_devvp); 792 free(pmp->pm_inusemap, M_MSDOSFSFAT); 793 free(pmp, M_MSDOSFSMNT); 794 mp->mnt_data = (qaddr_t)0; 795 mp->mnt_flag &= ~MNT_LOCAL; 796 return (error); 797 } 798 799 static int 800 msdosfs_root(struct mount *mp, struct vnode **vpp) 801 { 802 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 803 struct denode *ndep; 804 int error; 805 806 #ifdef MSDOSFS_DEBUG 807 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 808 #endif 809 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 810 if (error) 811 return (error); 812 *vpp = DETOV(ndep); 813 return (0); 814 } 815 816 static int 817 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 818 { 819 struct msdosfsmount *pmp; 820 821 pmp = VFSTOMSDOSFS(mp); 822 sbp->f_bsize = pmp->pm_bpcluster; 823 sbp->f_iosize = pmp->pm_bpcluster; 824 sbp->f_blocks = pmp->pm_maxcluster + 1; 825 sbp->f_bfree = pmp->pm_freeclustercount; 826 sbp->f_bavail = pmp->pm_freeclustercount; 827 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 828 sbp->f_ffree = 0; /* what to put in here? */ 829 if (sbp != &mp->mnt_stat) { 830 sbp->f_type = mp->mnt_vfc->vfc_typenum; 831 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 832 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 833 } 834 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 835 return (0); 836 } 837 838 struct scaninfo { 839 int rescan; 840 int allerror; 841 int waitfor; 842 thread_t td; 843 }; 844 845 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, 846 lwkt_tokref_t vlock, void *data); 847 848 static int 849 msdosfs_sync(struct mount *mp, int waitfor, struct thread *td) 850 { 851 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 852 struct scaninfo scaninfo; 853 int error; 854 855 /* 856 * If we ever switch to not updating all of the fats all the time, 857 * this would be the place to update them from the first one. 858 */ 859 if (pmp->pm_fmod != 0) { 860 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 861 panic("msdosfs_sync: rofs mod"); 862 else { 863 /* update fats here */ 864 } 865 } 866 /* 867 * Write back each (modified) denode. 868 */ 869 scaninfo.allerror = 0; 870 scaninfo.rescan = 1; 871 scaninfo.td = td; 872 while (scaninfo.rescan) { 873 scaninfo.rescan = 0; 874 vmntvnodescan(mp, NULL, msdosfs_sync_scan, &scaninfo); 875 } 876 877 /* 878 * Flush filesystem control info. 879 */ 880 if (waitfor != MNT_LAZY) { 881 vn_lock(pmp->pm_devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); 882 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, td)) != 0) 883 scaninfo.allerror = error; 884 VOP_UNLOCK(pmp->pm_devvp, NULL, 0, td); 885 } 886 return (scaninfo.allerror); 887 } 888 889 static int 890 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, 891 lwkt_tokref_t vlock, void *data) 892 { 893 struct scaninfo *info = data; 894 struct denode *dep; 895 int error; 896 897 dep = VTODE(vp); 898 if (vp->v_type == VNON || 899 ((dep->de_flag & 900 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 901 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || info->waitfor == MNT_LAZY))) { 902 lwkt_reltoken(vlock); 903 return(0); 904 } 905 error = vget(vp, vlock, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, info->td); 906 if (error) { 907 if (error == ENOENT) 908 info->rescan = 1; 909 return(0); 910 } 911 if ((error = VOP_FSYNC(vp, info->waitfor, info->td)) != 0) 912 info->allerror = error; 913 VOP_UNLOCK(vp, NULL, 0, info->td); 914 vrele(vp); 915 return(0); 916 } 917 918 static int 919 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 920 { 921 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 922 struct defid *defhp = (struct defid *) fhp; 923 struct denode *dep; 924 int error; 925 926 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 927 if (error) { 928 *vpp = NULLVP; 929 return (error); 930 } 931 *vpp = DETOV(dep); 932 return (0); 933 } 934 935 static int 936 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 937 struct ucred **credanonp) 938 { 939 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 940 struct netcred *np; 941 942 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 943 if (np == NULL) 944 return (EACCES); 945 *exflagsp = np->netc_exflags; 946 *credanonp = &np->netc_anon; 947 return (0); 948 } 949 950 static int 951 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 952 { 953 struct denode *dep; 954 struct defid *defhp; 955 956 dep = VTODE(vp); 957 defhp = (struct defid *)fhp; 958 defhp->defid_len = sizeof(struct defid); 959 defhp->defid_dirclust = dep->de_dirclust; 960 defhp->defid_dirofs = dep->de_diroffset; 961 /* defhp->defid_gen = dep->de_gen; */ 962 return (0); 963 } 964 965 static struct vfsops msdosfs_vfsops = { 966 msdosfs_mount, 967 vfs_stdstart, 968 msdosfs_unmount, 969 msdosfs_root, 970 vfs_stdquotactl, 971 msdosfs_statfs, 972 msdosfs_sync, 973 vfs_stdvget, 974 msdosfs_fhtovp, 975 msdosfs_checkexp, 976 msdosfs_vptofh, 977 msdosfs_init, 978 msdosfs_uninit, 979 vfs_stdextattrctl, 980 }; 981 982 VFS_SET(msdosfs_vfsops, msdos, 0); 983