msdosfs_vfsops.c revision 1.20
1 /* $NetBSD: msdosfs_vfsops.c,v 1.20 2004/09/13 19:25:48 jdolecek 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 1.20 2004/09/13 19:25:48 jdolecek 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 __P((void)); 88 int msdosfs_mount __P((struct mount *, const char *, void *, 89 struct nameidata *, struct proc *)); 90 int msdosfs_start __P((struct mount *, int, struct proc *)); 91 int msdosfs_unmount __P((struct mount *, int, struct proc *)); 92 int msdosfs_root __P((struct mount *, struct vnode **)); 93 int msdosfs_quotactl __P((struct mount *, int, uid_t, void *, struct proc *)); 94 int msdosfs_statvfs __P((struct mount *, struct statvfs *, struct proc *)); 95 int msdosfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 96 int msdosfs_vget __P((struct mount *, ino_t, struct vnode **)); 97 int msdosfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 98 int msdosfs_checkexp __P((struct mount *, struct mbuf *, int *, 99 struct ucred **)); 100 int msdosfs_vptofh __P((struct vnode *, struct fid *)); 101 102 int msdosfs_mountfs __P((struct vnode *, struct mount *, struct proc *, 103 struct msdosfs_args *)); 104 105 static int update_mp __P((struct mount *, struct msdosfs_args *)); 106 107 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 108 MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 109 110 #define ROOTNAME "root_device" 111 112 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 113 114 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 115 &msdosfs_vnodeop_opv_desc, 116 NULL, 117 }; 118 119 struct vfsops msdosfs_vfsops = { 120 MOUNT_MSDOS, 121 msdosfs_mount, 122 msdosfs_start, 123 msdosfs_unmount, 124 msdosfs_root, 125 msdosfs_quotactl, 126 msdosfs_statvfs, 127 msdosfs_sync, 128 msdosfs_vget, 129 msdosfs_fhtovp, 130 msdosfs_vptofh, 131 msdosfs_init, 132 msdosfs_reinit, 133 msdosfs_done, 134 NULL, 135 msdosfs_mountroot, 136 msdosfs_checkexp, 137 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 138 msdosfs_vnodeopv_descs, 139 }; 140 141 static int 142 update_mp(mp, argp) 143 struct mount *mp; 144 struct msdosfs_args *argp; 145 { 146 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 147 int error; 148 149 pmp->pm_gid = argp->gid; 150 pmp->pm_uid = argp->uid; 151 pmp->pm_mask = argp->mask & ALLPERMS; 152 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 153 pmp->pm_gmtoff = argp->gmtoff; 154 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 155 156 /* 157 * GEMDOS knows nothing (yet) about win95 158 */ 159 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 160 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 161 162 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 163 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 164 else if (!(pmp->pm_flags & 165 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 166 struct vnode *rootvp; 167 168 /* 169 * Try to divine whether to support Win'95 long filenames 170 */ 171 if (FAT32(pmp)) 172 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 173 else { 174 if ((error = msdosfs_root(mp, &rootvp)) != 0) 175 return error; 176 pmp->pm_flags |= findwin95(VTODE(rootvp)) 177 ? MSDOSFSMNT_LONGNAME 178 : MSDOSFSMNT_SHORTNAME; 179 vput(rootvp); 180 } 181 } 182 183 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 184 185 return 0; 186 } 187 188 int 189 msdosfs_mountroot() 190 { 191 struct mount *mp; 192 struct proc *p = curproc; /* XXX */ 193 int error; 194 struct msdosfs_args args; 195 196 if (root_device->dv_class != DV_DISK) 197 return (ENODEV); 198 199 /* 200 * Get vnodes for swapdev and rootdev. 201 */ 202 if (bdevvp(rootdev, &rootvp)) 203 panic("msdosfs_mountroot: can't setup rootvp"); 204 205 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 206 vrele(rootvp); 207 return (error); 208 } 209 210 args.flags = MSDOSFSMNT_VERSIONED; 211 args.uid = 0; 212 args.gid = 0; 213 args.mask = 0777; 214 args.version = MSDOSFSMNT_VERSION; 215 args.dirmask = 0777; 216 217 if ((error = msdosfs_mountfs(rootvp, mp, p, &args)) != 0) { 218 mp->mnt_op->vfs_refcount--; 219 vfs_unbusy(mp); 220 free(mp, M_MOUNT); 221 vrele(rootvp); 222 return (error); 223 } 224 225 if ((error = update_mp(mp, &args)) != 0) { 226 (void)msdosfs_unmount(mp, 0, p); 227 vfs_unbusy(mp); 228 free(mp, M_MOUNT); 229 vrele(rootvp); 230 return (error); 231 } 232 233 simple_lock(&mountlist_slock); 234 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 235 simple_unlock(&mountlist_slock); 236 (void)msdosfs_statvfs(mp, &mp->mnt_stat, p); 237 vfs_unbusy(mp); 238 return (0); 239 } 240 241 /* 242 * mp - path - addr in user space of mount point (ie /usr or whatever) 243 * data - addr in user space of mount params including the name of the block 244 * special file to treat as a filesystem. 245 */ 246 int 247 msdosfs_mount(mp, path, data, ndp, p) 248 struct mount *mp; 249 const char *path; 250 void *data; 251 struct nameidata *ndp; 252 struct proc *p; 253 { 254 struct vnode *devvp; /* vnode for blk device to mount */ 255 struct msdosfs_args args; /* will hold data from mount request */ 256 /* msdosfs specific mount control block */ 257 struct msdosfsmount *pmp = NULL; 258 int error, flags; 259 mode_t accessmode; 260 261 if (mp->mnt_flag & MNT_GETARGS) { 262 pmp = VFSTOMSDOSFS(mp); 263 if (pmp == NULL) 264 return EIO; 265 args.fspec = NULL; 266 args.uid = pmp->pm_uid; 267 args.gid = pmp->pm_gid; 268 args.mask = pmp->pm_mask; 269 args.flags = pmp->pm_flags; 270 args.version = MSDOSFSMNT_VERSION; 271 args.dirmask = pmp->pm_dirmask; 272 args.gmtoff = pmp->pm_gmtoff; 273 vfs_showexport(mp, &args.export, &pmp->pm_export); 274 return copyout(&args, data, sizeof(args)); 275 } 276 error = copyin(data, &args, sizeof(struct msdosfs_args)); 277 if (error) 278 return (error); 279 280 /* 281 * If not versioned (i.e. using old mount_msdos(8)), fill in 282 * the additional structure items with suitable defaults. 283 */ 284 if ((args.flags & MSDOSFSMNT_VERSIONED) == 0) { 285 args.version = 1; 286 args.dirmask = args.mask; 287 } 288 289 /* 290 * Reset GMT offset for pre-v3 mount structure args. 291 */ 292 if (args.version < 3) 293 args.gmtoff = 0; 294 295 /* 296 * If updating, check whether changing from read-only to 297 * read/write; if there is no device name, that's all we do. 298 */ 299 if (mp->mnt_flag & MNT_UPDATE) { 300 pmp = VFSTOMSDOSFS(mp); 301 error = 0; 302 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 303 flags = WRITECLOSE; 304 if (mp->mnt_flag & MNT_FORCE) 305 flags |= FORCECLOSE; 306 error = vflush(mp, NULLVP, flags); 307 } 308 if (!error && (mp->mnt_flag & MNT_RELOAD)) 309 /* not yet implemented */ 310 error = EOPNOTSUPP; 311 if (error) 312 return (error); 313 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 314 /* 315 * If upgrade to read-write by non-root, then verify 316 * that user has necessary permissions on the device. 317 */ 318 if (p->p_ucred->cr_uid != 0) { 319 devvp = pmp->pm_devvp; 320 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 321 error = VOP_ACCESS(devvp, VREAD | VWRITE, 322 p->p_ucred, p); 323 VOP_UNLOCK(devvp, 0); 324 if (error) 325 return (error); 326 } 327 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 328 } 329 if (args.fspec == 0) { 330 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 331 if (args.flags & MSDOSFSMNT_MNTOPT) { 332 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 333 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 334 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 335 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 336 } 337 #endif 338 /* 339 * Process export requests. 340 */ 341 return (vfs_export(mp, &pmp->pm_export, &args.export)); 342 } 343 } 344 /* 345 * Not an update, or updating the name: look up the name 346 * and verify that it refers to a sensible block device. 347 */ 348 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 349 if ((error = namei(ndp)) != 0) 350 return (error); 351 devvp = ndp->ni_vp; 352 353 if (devvp->v_type != VBLK) { 354 vrele(devvp); 355 return (ENOTBLK); 356 } 357 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 358 vrele(devvp); 359 return (ENXIO); 360 } 361 /* 362 * If mount by non-root, then verify that user has necessary 363 * permissions on the device. 364 */ 365 if (p->p_ucred->cr_uid != 0) { 366 accessmode = VREAD; 367 if ((mp->mnt_flag & MNT_RDONLY) == 0) 368 accessmode |= VWRITE; 369 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 370 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 371 VOP_UNLOCK(devvp, 0); 372 if (error) { 373 vrele(devvp); 374 return (error); 375 } 376 } 377 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 378 error = msdosfs_mountfs(devvp, mp, p, &args); 379 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 380 pmp = VFSTOMSDOSFS(mp); 381 #endif 382 } else { 383 if (devvp != pmp->pm_devvp) 384 error = EINVAL; /* needs translation */ 385 else 386 vrele(devvp); 387 } 388 if (error) { 389 vrele(devvp); 390 return (error); 391 } 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 } 404 405 int 406 msdosfs_mountfs(devvp, mp, p, argp) 407 struct vnode *devvp; 408 struct mount *mp; 409 struct proc *p; 410 struct msdosfs_args *argp; 411 { 412 struct msdosfsmount *pmp; 413 struct buf *bp; 414 dev_t dev = devvp->v_rdev; 415 struct partinfo dpart; 416 union bootsector *bsp; 417 struct byte_bpb33 *b33; 418 struct byte_bpb50 *b50; 419 struct byte_bpb710 *b710; 420 u_int8_t SecPerClust; 421 int ronly, error; 422 int bsize = 0, dtype = 0, tmp; 423 u_long dirsperblk; 424 425 /* 426 * Disallow multiple mounts of the same device. 427 * Disallow mounting of a device that is currently in use 428 * (except for root, which might share swap device for miniroot). 429 * Flush out any old buffers remaining from a previous use. 430 */ 431 if ((error = vfs_mountedon(devvp)) != 0) 432 return (error); 433 if (vcount(devvp) > 1 && devvp != rootvp) 434 return (EBUSY); 435 if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 436 return (error); 437 438 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 439 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 440 if (error) 441 return (error); 442 443 bp = NULL; /* both used in error_exit */ 444 pmp = NULL; 445 446 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 447 /* 448 * We need the disklabel to calculate the size of a FAT entry 449 * later on. Also make sure the partition contains a filesystem 450 * of type FS_MSDOS. This doesn't work for floppies, so we have 451 * to check for them too. 452 * 453 * At least some parts of the msdos fs driver seem to assume 454 * that the size of a disk block will always be 512 bytes. 455 * Let's check it... 456 */ 457 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, p); 458 if (error) 459 goto error_exit; 460 tmp = dpart.part->p_fstype; 461 dtype = dpart.disklab->d_type; 462 bsize = dpart.disklab->d_secsize; 463 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 464 error = EINVAL; 465 goto error_exit; 466 } 467 } 468 469 /* 470 * Read the boot sector of the filesystem, and then check the 471 * boot signature. If not a dos boot sector then error out. 472 */ 473 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 474 goto error_exit; 475 bp->b_flags |= B_AGE; 476 bsp = (union bootsector *)bp->b_data; 477 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 478 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 479 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 480 481 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 482 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 483 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 484 error = EINVAL; 485 goto error_exit; 486 } 487 } 488 489 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 490 memset(pmp, 0, sizeof *pmp); 491 pmp->pm_mountp = mp; 492 493 /* 494 * Compute several useful quantities from the bpb in the 495 * bootsector. Copy in the dos 5 variant of the bpb then fix up 496 * the fields that are different between dos 5 and dos 3.3. 497 */ 498 SecPerClust = b50->bpbSecPerClust; 499 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 500 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 501 pmp->pm_FATs = b50->bpbFATs; 502 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 503 pmp->pm_Sectors = getushort(b50->bpbSectors); 504 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 505 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 506 pmp->pm_Heads = getushort(b50->bpbHeads); 507 pmp->pm_Media = b50->bpbMedia; 508 509 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 510 /* XXX - We should probably check more values here */ 511 if (!pmp->pm_BytesPerSec || !SecPerClust 512 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 513 error = EINVAL; 514 goto error_exit; 515 } 516 } 517 518 if (pmp->pm_Sectors == 0) { 519 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 520 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 521 } else { 522 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 523 pmp->pm_HugeSectors = pmp->pm_Sectors; 524 } 525 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 526 if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) { 527 /* 528 * We cannot deal currently with this size of disk 529 * due to fileid limitations (see msdosfs_getattr and 530 * msdosfs_readdir) 531 */ 532 error = EINVAL; 533 goto error_exit; 534 } 535 536 if (pmp->pm_RootDirEnts == 0) { 537 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 538 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 539 || pmp->pm_Sectors 540 || pmp->pm_FATsecs 541 || getushort(b710->bpbFSVers)) { 542 error = EINVAL; 543 goto error_exit; 544 } 545 pmp->pm_fatmask = FAT32_MASK; 546 pmp->pm_fatmult = 4; 547 pmp->pm_fatdiv = 1; 548 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 549 550 /* mirrorring is enabled if the FATMIRROR bit is not set */ 551 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 552 pmp->pm_flags |= MSDOSFS_FATMIRROR; 553 else 554 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 555 } else 556 pmp->pm_flags |= MSDOSFS_FATMIRROR; 557 558 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 559 if (FAT32(pmp)) { 560 /* 561 * GEMDOS doesn't know fat32. 562 */ 563 error = EINVAL; 564 goto error_exit; 565 } 566 567 /* 568 * Check a few values (could do some more): 569 * - logical sector size: power of 2, >= block size 570 * - sectors per cluster: power of 2, >= 1 571 * - number of sectors: >= 1, <= size of partition 572 */ 573 if ( (SecPerClust == 0) 574 || (SecPerClust & (SecPerClust - 1)) 575 || (pmp->pm_BytesPerSec < bsize) 576 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 577 || (pmp->pm_HugeSectors == 0) 578 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 579 > dpart.part->p_size) 580 ) { 581 error = EINVAL; 582 goto error_exit; 583 } 584 /* 585 * XXX - Many parts of the msdos fs driver seem to assume that 586 * the number of bytes per logical sector (BytesPerSec) will 587 * always be the same as the number of bytes per disk block 588 * Let's pretend it is. 589 */ 590 tmp = pmp->pm_BytesPerSec / bsize; 591 pmp->pm_BytesPerSec = bsize; 592 pmp->pm_HugeSectors *= tmp; 593 pmp->pm_HiddenSects *= tmp; 594 pmp->pm_ResSectors *= tmp; 595 pmp->pm_Sectors *= tmp; 596 pmp->pm_FATsecs *= tmp; 597 SecPerClust *= tmp; 598 } 599 pmp->pm_fatblk = pmp->pm_ResSectors; 600 if (FAT32(pmp)) { 601 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 602 pmp->pm_firstcluster = pmp->pm_fatblk 603 + (pmp->pm_FATs * pmp->pm_FATsecs); 604 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 605 } else { 606 pmp->pm_rootdirblk = pmp->pm_fatblk + 607 (pmp->pm_FATs * pmp->pm_FATsecs); 608 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 609 + pmp->pm_BytesPerSec - 1) 610 / pmp->pm_BytesPerSec;/* in sectors */ 611 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 612 } 613 614 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 615 SecPerClust; 616 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 617 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 618 619 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 620 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 621 && (dtype == DTYPE_FLOPPY 622 || (dtype == DTYPE_VND 623 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 624 ) { 625 pmp->pm_fatmask = FAT12_MASK; 626 pmp->pm_fatmult = 3; 627 pmp->pm_fatdiv = 2; 628 } else { 629 pmp->pm_fatmask = FAT16_MASK; 630 pmp->pm_fatmult = 2; 631 pmp->pm_fatdiv = 1; 632 } 633 } else if (pmp->pm_fatmask == 0) { 634 if (pmp->pm_maxcluster 635 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 636 /* 637 * This will usually be a floppy disk. This size makes 638 * sure that one fat entry will not be split across 639 * multiple blocks. 640 */ 641 pmp->pm_fatmask = FAT12_MASK; 642 pmp->pm_fatmult = 3; 643 pmp->pm_fatdiv = 2; 644 } else { 645 pmp->pm_fatmask = FAT16_MASK; 646 pmp->pm_fatmult = 2; 647 pmp->pm_fatdiv = 1; 648 } 649 } 650 if (FAT12(pmp)) 651 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 652 else 653 pmp->pm_fatblocksize = MAXBSIZE; 654 655 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 656 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 657 658 /* 659 * Compute mask and shift value for isolating cluster relative byte 660 * offsets and cluster numbers from a file offset. 661 */ 662 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 663 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 664 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 665 666 /* 667 * Check for valid cluster size 668 * must be a power of 2 669 */ 670 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 671 error = EINVAL; 672 goto error_exit; 673 } 674 675 /* 676 * Release the bootsector buffer. 677 */ 678 brelse(bp); 679 bp = NULL; 680 681 /* 682 * Check FSInfo. 683 */ 684 if (pmp->pm_fsinfo) { 685 struct fsinfo *fp; 686 687 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 688 goto error_exit; 689 fp = (struct fsinfo *)bp->b_data; 690 if (!memcmp(fp->fsisig1, "RRaA", 4) 691 && !memcmp(fp->fsisig2, "rrAa", 4) 692 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 693 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 694 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 695 else 696 pmp->pm_fsinfo = 0; 697 brelse(bp); 698 bp = NULL; 699 } 700 701 /* 702 * Check and validate (or perhaps invalidate?) the fsinfo structure? 703 * XXX 704 */ 705 if (pmp->pm_fsinfo) { 706 if (pmp->pm_nxtfree == (u_long)-1) 707 pmp->pm_fsinfo = 0; 708 } 709 710 /* 711 * Allocate memory for the bitmap of allocated clusters, and then 712 * fill it in. 713 */ 714 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 715 / N_INUSEBITS) 716 * sizeof(*pmp->pm_inusemap), 717 M_MSDOSFSFAT, M_WAITOK); 718 719 /* 720 * fillinusemap() needs pm_devvp. 721 */ 722 pmp->pm_dev = dev; 723 pmp->pm_devvp = devvp; 724 725 /* 726 * Have the inuse map filled in. 727 */ 728 if ((error = fillinusemap(pmp)) != 0) 729 goto error_exit; 730 731 /* 732 * If they want fat updates to be synchronous then let them suffer 733 * the performance degradation in exchange for the on disk copy of 734 * the fat being correct just about all the time. I suppose this 735 * would be a good thing to turn on if the kernel is still flakey. 736 */ 737 if (mp->mnt_flag & MNT_SYNCHRONOUS) 738 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 739 740 /* 741 * Finish up. 742 */ 743 if (ronly) 744 pmp->pm_flags |= MSDOSFSMNT_RONLY; 745 else 746 pmp->pm_fmod = 1; 747 mp->mnt_data = pmp; 748 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 749 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 750 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 751 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 752 mp->mnt_flag |= MNT_LOCAL; 753 mp->mnt_dev_bshift = pmp->pm_bnshift; 754 mp->mnt_fs_bshift = pmp->pm_cnshift; 755 756 #ifdef QUOTA 757 /* 758 * If we ever do quotas for DOS filesystems this would be a place 759 * to fill in the info in the msdosfsmount structure. You dolt, 760 * quotas on dos filesystems make no sense because files have no 761 * owners on dos filesystems. of course there is some empty space 762 * in the directory entry where we could put uid's and gid's. 763 */ 764 #endif 765 devvp->v_specmountpoint = mp; 766 767 return (0); 768 769 error_exit:; 770 if (bp) 771 brelse(bp); 772 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 773 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 774 VOP_UNLOCK(devvp, 0); 775 if (pmp) { 776 if (pmp->pm_inusemap) 777 free(pmp->pm_inusemap, M_MSDOSFSFAT); 778 free(pmp, M_MSDOSFSMNT); 779 mp->mnt_data = NULL; 780 } 781 return (error); 782 } 783 784 int 785 msdosfs_start(mp, flags, p) 786 struct mount *mp; 787 int flags; 788 struct proc *p; 789 { 790 791 return (0); 792 } 793 794 /* 795 * Unmount the filesystem described by mp. 796 */ 797 int 798 msdosfs_unmount(mp, mntflags, p) 799 struct mount *mp; 800 int mntflags; 801 struct proc *p; 802 { 803 struct msdosfsmount *pmp; 804 int error, flags; 805 806 flags = 0; 807 if (mntflags & MNT_FORCE) 808 flags |= FORCECLOSE; 809 #ifdef QUOTA 810 #endif 811 if ((error = vflush(mp, NULLVP, flags)) != 0) 812 return (error); 813 pmp = VFSTOMSDOSFS(mp); 814 if (pmp->pm_devvp->v_type != VBAD) 815 pmp->pm_devvp->v_specmountpoint = NULL; 816 #ifdef MSDOSFS_DEBUG 817 { 818 struct vnode *vp = pmp->pm_devvp; 819 820 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 821 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 822 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 823 printf("id %lu, mount %p, op %p\n", 824 vp->v_id, vp->v_mount, vp->v_op); 825 printf("freef %p, freeb %p, mount %p\n", 826 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 827 vp->v_mount); 828 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 829 vp->v_cleanblkhd.lh_first, 830 vp->v_dirtyblkhd.lh_first, 831 vp->v_numoutput, vp->v_type); 832 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 833 vp->v_socket, vp->v_tag, 834 ((u_int *)vp->v_data)[0], 835 ((u_int *)vp->v_data)[1]); 836 } 837 #endif 838 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 839 error = VOP_CLOSE(pmp->pm_devvp, 840 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); 841 vput(pmp->pm_devvp); 842 free(pmp->pm_inusemap, M_MSDOSFSFAT); 843 free(pmp, M_MSDOSFSMNT); 844 mp->mnt_data = NULL; 845 mp->mnt_flag &= ~MNT_LOCAL; 846 return (error); 847 } 848 849 int 850 msdosfs_root(mp, vpp) 851 struct mount *mp; 852 struct vnode **vpp; 853 { 854 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 855 struct denode *ndep; 856 int error; 857 858 #ifdef MSDOSFS_DEBUG 859 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 860 #endif 861 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 862 return (error); 863 *vpp = DETOV(ndep); 864 return (0); 865 } 866 867 int 868 msdosfs_quotactl(mp, cmds, uid, arg, p) 869 struct mount *mp; 870 int cmds; 871 uid_t uid; 872 void *arg; 873 struct proc *p; 874 { 875 876 #ifdef QUOTA 877 return (EOPNOTSUPP); 878 #else 879 return (EOPNOTSUPP); 880 #endif 881 } 882 883 int 884 msdosfs_statvfs(mp, sbp, p) 885 struct mount *mp; 886 struct statvfs *sbp; 887 struct proc *p; 888 { 889 struct msdosfsmount *pmp; 890 891 pmp = VFSTOMSDOSFS(mp); 892 sbp->f_bsize = pmp->pm_bpcluster; 893 sbp->f_frsize = sbp->f_bsize; 894 sbp->f_iosize = pmp->pm_bpcluster; 895 sbp->f_blocks = pmp->pm_nmbrofclusters; 896 sbp->f_bfree = pmp->pm_freeclustercount; 897 sbp->f_bavail = pmp->pm_freeclustercount; 898 sbp->f_bresvd = 0; 899 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 900 sbp->f_ffree = 0; /* what to put in here? */ 901 sbp->f_favail = 0; /* what to put in here? */ 902 sbp->f_fresvd = 0; 903 copy_statvfs_info(sbp, mp); 904 return (0); 905 } 906 907 int 908 msdosfs_sync(mp, waitfor, cred, p) 909 struct mount *mp; 910 int waitfor; 911 struct ucred *cred; 912 struct proc *p; 913 { 914 struct vnode *vp, *nvp; 915 struct denode *dep; 916 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 917 int error, allerror = 0; 918 919 /* 920 * If we ever switch to not updating all of the fats all the time, 921 * this would be the place to update them from the first one. 922 */ 923 if (pmp->pm_fmod != 0) { 924 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 925 panic("msdosfs_sync: rofs mod"); 926 else { 927 /* update fats here */ 928 } 929 } 930 /* 931 * Write back each (modified) denode. 932 */ 933 simple_lock(&mntvnode_slock); 934 loop: 935 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 936 /* 937 * If the vnode that we are about to sync is no longer 938 * assoicated with this mount point, start over. 939 */ 940 if (vp->v_mount != mp) 941 goto loop; 942 simple_lock(&vp->v_interlock); 943 nvp = vp->v_mntvnodes.le_next; 944 dep = VTODE(vp); 945 if (waitfor == MNT_LAZY || vp->v_type == VNON || 946 (((dep->de_flag & 947 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 948 (LIST_EMPTY(&vp->v_dirtyblkhd) && 949 vp->v_uobj.uo_npages == 0))) { 950 simple_unlock(&vp->v_interlock); 951 continue; 952 } 953 simple_unlock(&mntvnode_slock); 954 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 955 if (error) { 956 simple_lock(&mntvnode_slock); 957 if (error == ENOENT) 958 goto loop; 959 continue; 960 } 961 if ((error = VOP_FSYNC(vp, cred, 962 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 963 allerror = error; 964 vput(vp); 965 simple_lock(&mntvnode_slock); 966 } 967 simple_unlock(&mntvnode_slock); 968 /* 969 * Force stale file system control information to be flushed. 970 */ 971 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 972 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 973 allerror = error; 974 #ifdef QUOTA 975 /* qsync(mp); */ 976 #endif 977 return (allerror); 978 } 979 980 int 981 msdosfs_fhtovp(mp, fhp, vpp) 982 struct mount *mp; 983 struct fid *fhp; 984 struct vnode **vpp; 985 { 986 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 987 struct defid *defhp = (struct defid *) fhp; 988 struct denode *dep; 989 int error; 990 991 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 992 if (error) { 993 *vpp = NULLVP; 994 return (error); 995 } 996 *vpp = DETOV(dep); 997 return (0); 998 } 999 1000 int 1001 msdosfs_checkexp(mp, nam, exflagsp, credanonp) 1002 struct mount *mp; 1003 struct mbuf *nam; 1004 int *exflagsp; 1005 struct ucred **credanonp; 1006 { 1007 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1008 struct netcred *np; 1009 1010 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 1011 if (np == NULL) 1012 return (EACCES); 1013 *exflagsp = np->netc_exflags; 1014 *credanonp = &np->netc_anon; 1015 return (0); 1016 } 1017 1018 int 1019 msdosfs_vptofh(vp, fhp) 1020 struct vnode *vp; 1021 struct fid *fhp; 1022 { 1023 struct denode *dep; 1024 struct defid *defhp; 1025 1026 dep = VTODE(vp); 1027 defhp = (struct defid *)fhp; 1028 defhp->defid_len = sizeof(struct defid); 1029 defhp->defid_dirclust = dep->de_dirclust; 1030 defhp->defid_dirofs = dep->de_diroffset; 1031 /* defhp->defid_gen = dep->de_gen; */ 1032 return (0); 1033 } 1034 1035 int 1036 msdosfs_vget(mp, ino, vpp) 1037 struct mount *mp; 1038 ino_t ino; 1039 struct vnode **vpp; 1040 { 1041 1042 return (EOPNOTSUPP); 1043 } 1044 1045 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1046 { 1047 1048 sysctl_createv(clog, 0, NULL, NULL, 1049 CTLFLAG_PERMANENT, 1050 CTLTYPE_NODE, "vfs", NULL, 1051 NULL, 0, NULL, 0, 1052 CTL_VFS, CTL_EOL); 1053 sysctl_createv(clog, 0, NULL, NULL, 1054 CTLFLAG_PERMANENT, 1055 CTLTYPE_NODE, "msdosfs", 1056 SYSCTL_DESCR("MS-DOS file system"), 1057 NULL, 0, NULL, 0, 1058 CTL_VFS, 4, CTL_EOL); 1059 /* 1060 * XXX the "4" above could be dynamic, thereby eliminating one 1061 * more instance of the "number to vfs" mapping problem, but 1062 * "4" is the order as taken from sys/mount.h 1063 */ 1064 } 1065
Indexes created Fri Sep 26 20:09:58 GMT 2025