msdosfs_vfsops.c revision 1.28
1 /* $NetBSD: msdosfs_vfsops.c,v 1.28 2005/09/23 12:10:32 jmmv Exp $ */ 2 3 /*- 4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 * All rights reserved. 7 * Original code by Paul Popelka (paulp (at) uts.amdahl.com) (see below). 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /* 35 * Written by Paul Popelka (paulp (at) uts.amdahl.com) 36 * 37 * You can do anything you want with this software, just don't say you wrote 38 * it, and don't remove this notice. 39 * 40 * This software is provided "as is". 41 * 42 * The author supplies this software to be publicly redistributed on the 43 * understanding that the author is not responsible for the correct 44 * functioning of this software in any circumstances and is not liable for 45 * any damages caused by this software. 46 * 47 * October 1992 48 */ 49 50 #include <sys/cdefs.h> 51 __KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.28 2005/09/23 12:10:32 jmmv Exp $"); 52 53 #if defined(_KERNEL_OPT) 54 #include "opt_quota.h" 55 #include "opt_compat_netbsd.h" 56 #endif 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/sysctl.h> 61 #include <sys/namei.h> 62 #include <sys/proc.h> 63 #include <sys/kernel.h> 64 #include <sys/vnode.h> 65 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 66 #include <sys/mount.h> 67 #include <sys/buf.h> 68 #include <sys/file.h> 69 #include <sys/device.h> 70 #include <sys/disklabel.h> 71 #include <sys/ioctl.h> 72 #include <sys/malloc.h> 73 #include <sys/dirent.h> 74 #include <sys/stat.h> 75 #include <sys/conf.h> 76 77 #include <fs/msdosfs/bpb.h> 78 #include <fs/msdosfs/bootsect.h> 79 #include <fs/msdosfs/direntry.h> 80 #include <fs/msdosfs/denode.h> 81 #include <fs/msdosfs/msdosfsmount.h> 82 #include <fs/msdosfs/fat.h> 83 84 #define MSDOSFS_NAMEMAX(pmp) \ 85 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 86 87 int msdosfs_mountroot(void); 88 int msdosfs_mount(struct mount *, const char *, void *, 89 struct nameidata *, struct proc *); 90 int msdosfs_start(struct mount *, int, struct proc *); 91 int msdosfs_unmount(struct mount *, int, struct proc *); 92 int msdosfs_root(struct mount *, struct vnode **); 93 int msdosfs_quotactl(struct mount *, int, uid_t, void *, struct proc *); 94 int msdosfs_statvfs(struct mount *, struct statvfs *, struct proc *); 95 int msdosfs_sync(struct mount *, int, struct ucred *, struct proc *); 96 int msdosfs_vget(struct mount *, ino_t, struct vnode **); 97 int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **); 98 int msdosfs_vptofh(struct vnode *, struct fid *); 99 100 int msdosfs_mountfs(struct vnode *, struct mount *, struct proc *, 101 struct msdosfs_args *); 102 103 static int update_mp(struct mount *, struct msdosfs_args *); 104 105 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 106 MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 107 108 #define ROOTNAME "root_device" 109 110 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 111 112 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 113 &msdosfs_vnodeop_opv_desc, 114 NULL, 115 }; 116 117 struct vfsops msdosfs_vfsops = { 118 MOUNT_MSDOS, 119 msdosfs_mount, 120 msdosfs_start, 121 msdosfs_unmount, 122 msdosfs_root, 123 msdosfs_quotactl, 124 msdosfs_statvfs, 125 msdosfs_sync, 126 msdosfs_vget, 127 msdosfs_fhtovp, 128 msdosfs_vptofh, 129 msdosfs_init, 130 msdosfs_reinit, 131 msdosfs_done, 132 msdosfs_mountroot, 133 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 134 vfs_stdextattrctl, 135 msdosfs_vnodeopv_descs, 136 }; 137 VFS_ATTACH(msdosfs_vfsops); 138 139 static int 140 update_mp(mp, argp) 141 struct mount *mp; 142 struct msdosfs_args *argp; 143 { 144 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 145 int error; 146 147 pmp->pm_gid = argp->gid; 148 pmp->pm_uid = argp->uid; 149 pmp->pm_mask = argp->mask & ALLPERMS; 150 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 151 pmp->pm_gmtoff = argp->gmtoff; 152 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 153 154 /* 155 * GEMDOS knows nothing (yet) about win95 156 */ 157 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 158 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 159 160 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 161 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 162 else if (!(pmp->pm_flags & 163 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 164 struct vnode *rtvp; 165 166 /* 167 * Try to divine whether to support Win'95 long filenames 168 */ 169 if (FAT32(pmp)) 170 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 171 else { 172 if ((error = msdosfs_root(mp, &rtvp)) != 0) 173 return error; 174 pmp->pm_flags |= findwin95(VTODE(rtvp)) 175 ? MSDOSFSMNT_LONGNAME 176 : MSDOSFSMNT_SHORTNAME; 177 vput(rtvp); 178 } 179 } 180 181 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 182 183 return 0; 184 } 185 186 int 187 msdosfs_mountroot() 188 { 189 struct mount *mp; 190 struct proc *p = curproc; /* XXX */ 191 int error; 192 struct msdosfs_args args; 193 194 if (root_device->dv_class != DV_DISK) 195 return (ENODEV); 196 197 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 198 vrele(rootvp); 199 return (error); 200 } 201 202 args.flags = MSDOSFSMNT_VERSIONED; 203 args.uid = 0; 204 args.gid = 0; 205 args.mask = 0777; 206 args.version = MSDOSFSMNT_VERSION; 207 args.dirmask = 0777; 208 209 if ((error = msdosfs_mountfs(rootvp, mp, p, &args)) != 0) { 210 mp->mnt_op->vfs_refcount--; 211 vfs_unbusy(mp); 212 free(mp, M_MOUNT); 213 return (error); 214 } 215 216 if ((error = update_mp(mp, &args)) != 0) { 217 (void)msdosfs_unmount(mp, 0, p); 218 vfs_unbusy(mp); 219 free(mp, M_MOUNT); 220 vrele(rootvp); 221 return (error); 222 } 223 224 simple_lock(&mountlist_slock); 225 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 226 simple_unlock(&mountlist_slock); 227 (void)msdosfs_statvfs(mp, &mp->mnt_stat, p); 228 vfs_unbusy(mp); 229 return (0); 230 } 231 232 /* 233 * mp - path - addr in user space of mount point (ie /usr or whatever) 234 * data - addr in user space of mount params including the name of the block 235 * special file to treat as a filesystem. 236 */ 237 int 238 msdosfs_mount(mp, path, data, ndp, p) 239 struct mount *mp; 240 const char *path; 241 void *data; 242 struct nameidata *ndp; 243 struct proc *p; 244 { 245 struct vnode *devvp; /* vnode for blk device to mount */ 246 struct msdosfs_args args; /* will hold data from mount request */ 247 /* msdosfs specific mount control block */ 248 struct msdosfsmount *pmp = NULL; 249 int error, flags; 250 mode_t accessmode; 251 252 if (mp->mnt_flag & MNT_GETARGS) { 253 pmp = VFSTOMSDOSFS(mp); 254 if (pmp == NULL) 255 return EIO; 256 args.fspec = NULL; 257 args.uid = pmp->pm_uid; 258 args.gid = pmp->pm_gid; 259 args.mask = pmp->pm_mask; 260 args.flags = pmp->pm_flags; 261 args.version = MSDOSFSMNT_VERSION; 262 args.dirmask = pmp->pm_dirmask; 263 args.gmtoff = pmp->pm_gmtoff; 264 return copyout(&args, data, sizeof(args)); 265 } 266 error = copyin(data, &args, sizeof(struct msdosfs_args)); 267 if (error) 268 return (error); 269 270 /* 271 * If not versioned (i.e. using old mount_msdos(8)), fill in 272 * the additional structure items with suitable defaults. 273 */ 274 if ((args.flags & MSDOSFSMNT_VERSIONED) == 0) { 275 args.version = 1; 276 args.dirmask = args.mask; 277 } 278 279 /* 280 * Reset GMT offset for pre-v3 mount structure args. 281 */ 282 if (args.version < 3) 283 args.gmtoff = 0; 284 285 /* 286 * If updating, check whether changing from read-only to 287 * read/write; if there is no device name, that's all we do. 288 */ 289 if (mp->mnt_flag & MNT_UPDATE) { 290 pmp = VFSTOMSDOSFS(mp); 291 error = 0; 292 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 293 flags = WRITECLOSE; 294 if (mp->mnt_flag & MNT_FORCE) 295 flags |= FORCECLOSE; 296 error = vflush(mp, NULLVP, flags); 297 } 298 if (!error && (mp->mnt_flag & MNT_RELOAD)) 299 /* not yet implemented */ 300 error = EOPNOTSUPP; 301 if (error) 302 return (error); 303 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 304 /* 305 * If upgrade to read-write by non-root, then verify 306 * that user has necessary permissions on the device. 307 */ 308 if (p->p_ucred->cr_uid != 0) { 309 devvp = pmp->pm_devvp; 310 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 311 error = VOP_ACCESS(devvp, VREAD | VWRITE, 312 p->p_ucred, p); 313 VOP_UNLOCK(devvp, 0); 314 if (error) 315 return (error); 316 } 317 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 318 } 319 if (args.fspec == NULL) 320 return EINVAL; 321 } 322 /* 323 * Not an update, or updating the name: look up the name 324 * and verify that it refers to a sensible block device. 325 */ 326 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 327 if ((error = namei(ndp)) != 0) 328 return (error); 329 devvp = ndp->ni_vp; 330 331 if (devvp->v_type != VBLK) { 332 vrele(devvp); 333 return (ENOTBLK); 334 } 335 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 336 vrele(devvp); 337 return (ENXIO); 338 } 339 /* 340 * If mount by non-root, then verify that user has necessary 341 * permissions on the device. 342 */ 343 if (p->p_ucred->cr_uid != 0) { 344 accessmode = VREAD; 345 if ((mp->mnt_flag & MNT_RDONLY) == 0) 346 accessmode |= VWRITE; 347 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 348 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 349 VOP_UNLOCK(devvp, 0); 350 if (error) { 351 vrele(devvp); 352 return (error); 353 } 354 } 355 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 356 int xflags; 357 358 /* 359 * Disallow multiple mounts of the same device. 360 * Disallow mounting of a device that is currently in use 361 * (except for root, which might share swap device for 362 * miniroot). 363 */ 364 error = vfs_mountedon(devvp); 365 if (error) 366 goto fail; 367 if (vcount(devvp) > 1 && devvp != rootvp) { 368 error = EBUSY; 369 goto fail; 370 } 371 if (mp->mnt_flag & MNT_RDONLY) 372 xflags = FREAD; 373 else 374 xflags = FREAD|FWRITE; 375 error = VOP_OPEN(devvp, xflags, FSCRED, p); 376 if (error) 377 goto fail; 378 error = msdosfs_mountfs(devvp, mp, p, &args); 379 if (error) { 380 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 381 (void) VOP_CLOSE(devvp, xflags, NOCRED, p); 382 VOP_UNLOCK(devvp, 0); 383 goto fail; 384 } 385 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 386 pmp = VFSTOMSDOSFS(mp); 387 #endif 388 } else { 389 vrele(devvp); 390 if (devvp != pmp->pm_devvp) 391 return (EINVAL); /* needs translation */ 392 } 393 if ((error = update_mp(mp, &args)) != 0) { 394 msdosfs_unmount(mp, MNT_FORCE, p); 395 return error; 396 } 397 398 #ifdef MSDOSFS_DEBUG 399 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 400 #endif 401 return set_statvfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE, 402 mp, p); 403 404 fail: 405 vrele(devvp); 406 return (error); 407 } 408 409 int 410 msdosfs_mountfs(devvp, mp, p, argp) 411 struct vnode *devvp; 412 struct mount *mp; 413 struct proc *p; 414 struct msdosfs_args *argp; 415 { 416 struct msdosfsmount *pmp; 417 struct buf *bp; 418 dev_t dev = devvp->v_rdev; 419 struct partinfo dpart; 420 union bootsector *bsp; 421 struct byte_bpb33 *b33; 422 struct byte_bpb50 *b50; 423 struct byte_bpb710 *b710; 424 u_int8_t SecPerClust; 425 int ronly, error; 426 int bsize = 0, dtype = 0, tmp; 427 428 /* Flush out any old buffers remaining from a previous use. */ 429 if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 430 return (error); 431 432 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 433 434 bp = NULL; /* both used in error_exit */ 435 pmp = NULL; 436 437 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 438 /* 439 * We need the disklabel to calculate the size of a FAT entry 440 * later on. Also make sure the partition contains a filesystem 441 * of type FS_MSDOS. This doesn't work for floppies, so we have 442 * to check for them too. 443 * 444 * At least some parts of the msdos fs driver seem to assume 445 * that the size of a disk block will always be 512 bytes. 446 * Let's check it... 447 */ 448 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, p); 449 if (error) 450 goto error_exit; 451 tmp = dpart.part->p_fstype; 452 dtype = dpart.disklab->d_type; 453 bsize = dpart.disklab->d_secsize; 454 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 455 error = EINVAL; 456 goto error_exit; 457 } 458 } 459 460 /* 461 * Read the boot sector of the filesystem, and then check the 462 * boot signature. If not a dos boot sector then error out. 463 */ 464 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 465 goto error_exit; 466 bp->b_flags |= B_AGE; 467 bsp = (union bootsector *)bp->b_data; 468 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 469 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 470 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 471 472 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 473 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 474 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 475 error = EINVAL; 476 goto error_exit; 477 } 478 } 479 480 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 481 memset(pmp, 0, sizeof *pmp); 482 pmp->pm_mountp = mp; 483 484 /* 485 * Compute several useful quantities from the bpb in the 486 * bootsector. Copy in the dos 5 variant of the bpb then fix up 487 * the fields that are different between dos 5 and dos 3.3. 488 */ 489 SecPerClust = b50->bpbSecPerClust; 490 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 491 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 492 pmp->pm_FATs = b50->bpbFATs; 493 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 494 pmp->pm_Sectors = getushort(b50->bpbSectors); 495 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 496 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 497 pmp->pm_Heads = getushort(b50->bpbHeads); 498 pmp->pm_Media = b50->bpbMedia; 499 500 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 501 /* XXX - We should probably check more values here */ 502 if (!pmp->pm_BytesPerSec || !SecPerClust 503 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 504 error = EINVAL; 505 goto error_exit; 506 } 507 } 508 509 if (pmp->pm_Sectors == 0) { 510 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 511 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 512 } else { 513 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 514 pmp->pm_HugeSectors = pmp->pm_Sectors; 515 } 516 517 if (pmp->pm_RootDirEnts == 0) { 518 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 519 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 520 || pmp->pm_Sectors 521 || pmp->pm_FATsecs 522 || getushort(b710->bpbFSVers)) { 523 error = EINVAL; 524 goto error_exit; 525 } 526 pmp->pm_fatmask = FAT32_MASK; 527 pmp->pm_fatmult = 4; 528 pmp->pm_fatdiv = 1; 529 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 530 531 /* mirrorring is enabled if the FATMIRROR bit is not set */ 532 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 533 pmp->pm_flags |= MSDOSFS_FATMIRROR; 534 else 535 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 536 } else 537 pmp->pm_flags |= MSDOSFS_FATMIRROR; 538 539 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 540 if (FAT32(pmp)) { 541 /* 542 * GEMDOS doesn't know fat32. 543 */ 544 error = EINVAL; 545 goto error_exit; 546 } 547 548 /* 549 * Check a few values (could do some more): 550 * - logical sector size: power of 2, >= block size 551 * - sectors per cluster: power of 2, >= 1 552 * - number of sectors: >= 1, <= size of partition 553 */ 554 if ( (SecPerClust == 0) 555 || (SecPerClust & (SecPerClust - 1)) 556 || (pmp->pm_BytesPerSec < bsize) 557 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 558 || (pmp->pm_HugeSectors == 0) 559 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 560 > dpart.part->p_size) 561 ) { 562 error = EINVAL; 563 goto error_exit; 564 } 565 /* 566 * XXX - Many parts of the msdos fs driver seem to assume that 567 * the number of bytes per logical sector (BytesPerSec) will 568 * always be the same as the number of bytes per disk block 569 * Let's pretend it is. 570 */ 571 tmp = pmp->pm_BytesPerSec / bsize; 572 pmp->pm_BytesPerSec = bsize; 573 pmp->pm_HugeSectors *= tmp; 574 pmp->pm_HiddenSects *= tmp; 575 pmp->pm_ResSectors *= tmp; 576 pmp->pm_Sectors *= tmp; 577 pmp->pm_FATsecs *= tmp; 578 SecPerClust *= tmp; 579 } 580 pmp->pm_fatblk = pmp->pm_ResSectors; 581 if (FAT32(pmp)) { 582 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 583 pmp->pm_firstcluster = pmp->pm_fatblk 584 + (pmp->pm_FATs * pmp->pm_FATsecs); 585 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 586 } else { 587 pmp->pm_rootdirblk = pmp->pm_fatblk + 588 (pmp->pm_FATs * pmp->pm_FATsecs); 589 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 590 + pmp->pm_BytesPerSec - 1) 591 / pmp->pm_BytesPerSec;/* in sectors */ 592 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 593 } 594 595 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 596 SecPerClust; 597 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 598 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 599 600 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 601 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 602 && (dtype == DTYPE_FLOPPY 603 || (dtype == DTYPE_VND 604 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 605 ) { 606 pmp->pm_fatmask = FAT12_MASK; 607 pmp->pm_fatmult = 3; 608 pmp->pm_fatdiv = 2; 609 } else { 610 pmp->pm_fatmask = FAT16_MASK; 611 pmp->pm_fatmult = 2; 612 pmp->pm_fatdiv = 1; 613 } 614 } else if (pmp->pm_fatmask == 0) { 615 if (pmp->pm_maxcluster 616 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 617 /* 618 * This will usually be a floppy disk. This size makes 619 * sure that one fat entry will not be split across 620 * multiple blocks. 621 */ 622 pmp->pm_fatmask = FAT12_MASK; 623 pmp->pm_fatmult = 3; 624 pmp->pm_fatdiv = 2; 625 } else { 626 pmp->pm_fatmask = FAT16_MASK; 627 pmp->pm_fatmult = 2; 628 pmp->pm_fatdiv = 1; 629 } 630 } 631 if (FAT12(pmp)) 632 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 633 else 634 pmp->pm_fatblocksize = MAXBSIZE; 635 636 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 637 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 638 639 /* 640 * Compute mask and shift value for isolating cluster relative byte 641 * offsets and cluster numbers from a file offset. 642 */ 643 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 644 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 645 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 646 647 /* 648 * Check for valid cluster size 649 * must be a power of 2 650 */ 651 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 652 error = EINVAL; 653 goto error_exit; 654 } 655 656 /* 657 * Release the bootsector buffer. 658 */ 659 brelse(bp); 660 bp = NULL; 661 662 /* 663 * Check FSInfo. 664 */ 665 if (pmp->pm_fsinfo) { 666 struct fsinfo *fp; 667 668 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 669 goto error_exit; 670 fp = (struct fsinfo *)bp->b_data; 671 if (!memcmp(fp->fsisig1, "RRaA", 4) 672 && !memcmp(fp->fsisig2, "rrAa", 4) 673 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 674 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 675 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 676 else 677 pmp->pm_fsinfo = 0; 678 brelse(bp); 679 bp = NULL; 680 } 681 682 /* 683 * Check and validate (or perhaps invalidate?) the fsinfo structure? 684 * XXX 685 */ 686 if (pmp->pm_fsinfo) { 687 if (pmp->pm_nxtfree == (u_long)-1) 688 pmp->pm_fsinfo = 0; 689 } 690 691 /* 692 * Allocate memory for the bitmap of allocated clusters, and then 693 * fill it in. 694 */ 695 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 696 / N_INUSEBITS) 697 * sizeof(*pmp->pm_inusemap), 698 M_MSDOSFSFAT, M_WAITOK); 699 700 /* 701 * fillinusemap() needs pm_devvp. 702 */ 703 pmp->pm_dev = dev; 704 pmp->pm_devvp = devvp; 705 706 /* 707 * Have the inuse map filled in. 708 */ 709 if ((error = fillinusemap(pmp)) != 0) 710 goto error_exit; 711 712 /* 713 * If they want fat updates to be synchronous then let them suffer 714 * the performance degradation in exchange for the on disk copy of 715 * the fat being correct just about all the time. I suppose this 716 * would be a good thing to turn on if the kernel is still flakey. 717 */ 718 if (mp->mnt_flag & MNT_SYNCHRONOUS) 719 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 720 721 /* 722 * Finish up. 723 */ 724 if (ronly) 725 pmp->pm_flags |= MSDOSFSMNT_RONLY; 726 else 727 pmp->pm_fmod = 1; 728 mp->mnt_data = pmp; 729 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 730 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 731 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 732 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 733 mp->mnt_flag |= MNT_LOCAL; 734 mp->mnt_dev_bshift = pmp->pm_bnshift; 735 mp->mnt_fs_bshift = pmp->pm_cnshift; 736 737 #ifdef QUOTA 738 /* 739 * If we ever do quotas for DOS filesystems this would be a place 740 * to fill in the info in the msdosfsmount structure. You dolt, 741 * quotas on dos filesystems make no sense because files have no 742 * owners on dos filesystems. of course there is some empty space 743 * in the directory entry where we could put uid's and gid's. 744 */ 745 #endif 746 devvp->v_specmountpoint = mp; 747 748 return (0); 749 750 error_exit:; 751 if (bp) 752 brelse(bp); 753 if (pmp) { 754 if (pmp->pm_inusemap) 755 free(pmp->pm_inusemap, M_MSDOSFSFAT); 756 free(pmp, M_MSDOSFSMNT); 757 mp->mnt_data = NULL; 758 } 759 return (error); 760 } 761 762 int 763 msdosfs_start(mp, flags, p) 764 struct mount *mp; 765 int flags; 766 struct proc *p; 767 { 768 769 return (0); 770 } 771 772 /* 773 * Unmount the filesystem described by mp. 774 */ 775 int 776 msdosfs_unmount(mp, mntflags, p) 777 struct mount *mp; 778 int mntflags; 779 struct proc *p; 780 { 781 struct msdosfsmount *pmp; 782 int error, flags; 783 784 flags = 0; 785 if (mntflags & MNT_FORCE) 786 flags |= FORCECLOSE; 787 #ifdef QUOTA 788 #endif 789 if ((error = vflush(mp, NULLVP, flags)) != 0) 790 return (error); 791 pmp = VFSTOMSDOSFS(mp); 792 if (pmp->pm_devvp->v_type != VBAD) 793 pmp->pm_devvp->v_specmountpoint = NULL; 794 #ifdef MSDOSFS_DEBUG 795 { 796 struct vnode *vp = pmp->pm_devvp; 797 798 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 799 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 800 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 801 printf("mount %p, op %p\n", 802 vp->v_mount, vp->v_op); 803 printf("freef %p, freeb %p, mount %p\n", 804 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 805 vp->v_mount); 806 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 807 vp->v_cleanblkhd.lh_first, 808 vp->v_dirtyblkhd.lh_first, 809 vp->v_numoutput, vp->v_type); 810 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 811 vp->v_socket, vp->v_tag, 812 ((u_int *)vp->v_data)[0], 813 ((u_int *)vp->v_data)[1]); 814 } 815 #endif 816 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 817 error = VOP_CLOSE(pmp->pm_devvp, 818 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); 819 vput(pmp->pm_devvp); 820 free(pmp->pm_inusemap, M_MSDOSFSFAT); 821 free(pmp, M_MSDOSFSMNT); 822 mp->mnt_data = NULL; 823 mp->mnt_flag &= ~MNT_LOCAL; 824 return (error); 825 } 826 827 int 828 msdosfs_root(mp, vpp) 829 struct mount *mp; 830 struct vnode **vpp; 831 { 832 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 833 struct denode *ndep; 834 int error; 835 836 #ifdef MSDOSFS_DEBUG 837 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 838 #endif 839 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 840 return (error); 841 *vpp = DETOV(ndep); 842 return (0); 843 } 844 845 int 846 msdosfs_quotactl(mp, cmds, uid, arg, p) 847 struct mount *mp; 848 int cmds; 849 uid_t uid; 850 void *arg; 851 struct proc *p; 852 { 853 854 #ifdef QUOTA 855 return (EOPNOTSUPP); 856 #else 857 return (EOPNOTSUPP); 858 #endif 859 } 860 861 int 862 msdosfs_statvfs(mp, sbp, p) 863 struct mount *mp; 864 struct statvfs *sbp; 865 struct proc *p; 866 { 867 struct msdosfsmount *pmp; 868 869 pmp = VFSTOMSDOSFS(mp); 870 sbp->f_bsize = pmp->pm_bpcluster; 871 sbp->f_frsize = sbp->f_bsize; 872 sbp->f_iosize = pmp->pm_bpcluster; 873 sbp->f_blocks = pmp->pm_nmbrofclusters; 874 sbp->f_bfree = pmp->pm_freeclustercount; 875 sbp->f_bavail = pmp->pm_freeclustercount; 876 sbp->f_bresvd = 0; 877 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 878 sbp->f_ffree = 0; /* what to put in here? */ 879 sbp->f_favail = 0; /* what to put in here? */ 880 sbp->f_fresvd = 0; 881 copy_statvfs_info(sbp, mp); 882 return (0); 883 } 884 885 int 886 msdosfs_sync(mp, waitfor, cred, p) 887 struct mount *mp; 888 int waitfor; 889 struct ucred *cred; 890 struct proc *p; 891 { 892 struct vnode *vp, *nvp; 893 struct denode *dep; 894 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 895 int error, allerror = 0; 896 897 /* 898 * If we ever switch to not updating all of the fats all the time, 899 * this would be the place to update them from the first one. 900 */ 901 if (pmp->pm_fmod != 0) { 902 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 903 panic("msdosfs_sync: rofs mod"); 904 else { 905 /* update fats here */ 906 } 907 } 908 /* 909 * Write back each (modified) denode. 910 */ 911 simple_lock(&mntvnode_slock); 912 loop: 913 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 914 /* 915 * If the vnode that we are about to sync is no longer 916 * assoicated with this mount point, start over. 917 */ 918 if (vp->v_mount != mp) 919 goto loop; 920 simple_lock(&vp->v_interlock); 921 nvp = vp->v_mntvnodes.le_next; 922 dep = VTODE(vp); 923 if (waitfor == MNT_LAZY || vp->v_type == VNON || 924 (((dep->de_flag & 925 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 926 (LIST_EMPTY(&vp->v_dirtyblkhd) && 927 vp->v_uobj.uo_npages == 0))) { 928 simple_unlock(&vp->v_interlock); 929 continue; 930 } 931 simple_unlock(&mntvnode_slock); 932 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 933 if (error) { 934 simple_lock(&mntvnode_slock); 935 if (error == ENOENT) 936 goto loop; 937 continue; 938 } 939 if ((error = VOP_FSYNC(vp, cred, 940 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 941 allerror = error; 942 vput(vp); 943 simple_lock(&mntvnode_slock); 944 } 945 simple_unlock(&mntvnode_slock); 946 /* 947 * Force stale file system control information to be flushed. 948 */ 949 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 950 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 951 allerror = error; 952 #ifdef QUOTA 953 /* qsync(mp); */ 954 #endif 955 return (allerror); 956 } 957 958 int 959 msdosfs_fhtovp(mp, fhp, vpp) 960 struct mount *mp; 961 struct fid *fhp; 962 struct vnode **vpp; 963 { 964 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 965 struct defid *defhp = (struct defid *) fhp; 966 struct denode *dep; 967 int error; 968 969 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 970 if (error) { 971 *vpp = NULLVP; 972 return (error); 973 } 974 *vpp = DETOV(dep); 975 return (0); 976 } 977 978 int 979 msdosfs_vptofh(vp, fhp) 980 struct vnode *vp; 981 struct fid *fhp; 982 { 983 struct denode *dep; 984 struct defid *defhp; 985 986 dep = VTODE(vp); 987 defhp = (struct defid *)fhp; 988 defhp->defid_len = sizeof(struct defid); 989 defhp->defid_dirclust = dep->de_dirclust; 990 defhp->defid_dirofs = dep->de_diroffset; 991 /* defhp->defid_gen = dep->de_gen; */ 992 return (0); 993 } 994 995 int 996 msdosfs_vget(mp, ino, vpp) 997 struct mount *mp; 998 ino_t ino; 999 struct vnode **vpp; 1000 { 1001 1002 return (EOPNOTSUPP); 1003 } 1004 1005 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1006 { 1007 1008 sysctl_createv(clog, 0, NULL, NULL, 1009 CTLFLAG_PERMANENT, 1010 CTLTYPE_NODE, "vfs", NULL, 1011 NULL, 0, NULL, 0, 1012 CTL_VFS, CTL_EOL); 1013 sysctl_createv(clog, 0, NULL, NULL, 1014 CTLFLAG_PERMANENT, 1015 CTLTYPE_NODE, "msdosfs", 1016 SYSCTL_DESCR("MS-DOS file system"), 1017 NULL, 0, NULL, 0, 1018 CTL_VFS, 4, CTL_EOL); 1019 /* 1020 * XXX the "4" above could be dynamic, thereby eliminating one 1021 * more instance of the "number to vfs" mapping problem, but 1022 * "4" is the order as taken from sys/mount.h 1023 */ 1024 } 1025
Indexes created Fri Sep 26 20:09:58 GMT 2025