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Annotation of sys/msdosfs/fat.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: fat.h,v 1.9 2006/12/15 03:04:24 krw Exp $     */
                      2: /*     $NetBSD: fat.h,v 1.11 1997/10/17 11:23:49 ws Exp $      */
                      3:
                      4: /*-
                      5:  * Copyright (C) 1994, 1997 Wolfgang Solfrank.
                      6:  * Copyright (C) 1994, 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: /*
                     52:  * Some useful cluster numbers.
                     53:  */
                     54: #define        MSDOSFSROOT     0               /* cluster 0 means the root dir */
                     55: #define        CLUST_FREE      0               /* cluster 0 also means a free cluster */
                     56: #define        MSDOSFSFREE     CLUST_FREE
                     57: #define        CLUST_FIRST     2               /* first legal cluster number */
                     58: #define        CLUST_RSRVD     0xfffffff6      /* reserved cluster range */
                     59: #define        CLUST_BAD       0xfffffff7      /* a cluster with a defect */
                     60: #define        CLUST_EOFS      0xfffffff8      /* start of eof cluster range */
                     61: #define        CLUST_EOFE      0xffffffff      /* end of eof cluster range */
                     62:
                     63: #define        FAT12_MASK      0x00000fff      /* mask for 12 bit cluster numbers */
                     64: #define        FAT16_MASK      0x0000ffff      /* mask for 16 bit cluster numbers */
                     65: #define        FAT32_MASK      0x0fffffff      /* mask for FAT32 cluster numbers */
                     66:
                     67: /*
                     68:  * MSDOSFS:
                     69:  * Return true if filesystem uses 12 bit fats. Microsoft Programmer's
                     70:  * Reference says if the maximum cluster number in a filesystem is greater
                     71:  * than 4078 ((CLUST_RSRVS - CLUST_FIRST) & FAT12_MASK) then we've got a
                     72:  * 16 bit fat filesystem. While mounting, the result of this test is stored
                     73:  * in pm_fatentrysize.
                     74:  */
                     75: #define        FAT12(pmp)      (pmp->pm_fatmask == FAT12_MASK)
                     76: #define        FAT16(pmp)      (pmp->pm_fatmask == FAT16_MASK)
                     77: #define        FAT32(pmp)      (pmp->pm_fatmask == FAT32_MASK)
                     78:
                     79: #define        MSDOSFSEOF(pmp, cn)     ((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS)
                     80:
                     81: #ifdef _KERNEL
                     82: /*
                     83:  * These are the values for the function argument to the function
                     84:  * fatentry().
                     85:  */
                     86: #define        FAT_GET         0x0001  /* get a fat entry */
                     87: #define        FAT_SET         0x0002  /* set a fat entry */
                     88: #define        FAT_GET_AND_SET (FAT_GET | FAT_SET)
                     89:
                     90: /*
                     91:  * Flags to extendfile:
                     92:  */
                     93: #define        DE_CLEAR        1       /* Zero out the blocks allocated */
                     94:
                     95: int pcbmap(struct denode *, uint32_t, daddr64_t *, uint32_t *, int *);
                     96: int clusterfree(struct msdosfsmount *, uint32_t, uint32_t *);
                     97: int clusteralloc(struct msdosfsmount *, uint32_t, uint32_t, uint32_t, uint32_t *, uint32_t *);
                     98: int extendfile(struct denode *, uint32_t, struct buf **, uint32_t *, int);
                     99: int fatentry(int, struct msdosfsmount *, uint32_t, uint32_t *, uint32_t);
                    100: void fc_purge(struct denode *, u_int);
                    101: void fc_lookup(struct denode *, uint32_t, uint32_t *, uint32_t *);
                    102: int fillinusemap(struct msdosfsmount *);
                    103: int freeclusterchain(struct msdosfsmount *, uint32_t);
                    104: #endif /* _KERNEL */