The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/msdosfs/fat.h

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    1 /* $FreeBSD$ */
    2 /*      $NetBSD: fat.h,v 1.12 1997/11/17 15:36:36 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  * GEMDOS-flavour (atari):
   75  * If the filesystem is on floppy we've got a 12 bit fat filesystem, otherwise
   76  * 16 bit. We check the d_type field in the disklabel struct while mounting
   77  * and store the result in the pm_fatentrysize. Note that this kind of
   78  * detection gets flakey when mounting a vnd-device.
   79  */
   80 #define FAT12(pmp)      (pmp->pm_fatmask == FAT12_MASK)
   81 #define FAT16(pmp)      (pmp->pm_fatmask == FAT16_MASK)
   82 #define FAT32(pmp)      (pmp->pm_fatmask == FAT32_MASK)
   83 
   84 #define MSDOSFSEOF(pmp, cn)     ((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS)
   85 
   86 #ifdef _KERNEL
   87 /*
   88  * These are the values for the function argument to the function
   89  * fatentry().
   90  */
   91 #define FAT_GET         0x0001  /* get a fat entry */
   92 #define FAT_SET         0x0002  /* set a fat entry */
   93 #define FAT_GET_AND_SET (FAT_GET | FAT_SET)
   94 
   95 /*
   96  * Flags to extendfile:
   97  */
   98 #define DE_CLEAR        1       /* Zero out the blocks allocated */
   99 
  100 int pcbmap __P((struct denode *dep, u_long findcn, daddr_t *bnp, u_long *cnp, int* sp));
  101 int clusterfree __P((struct msdosfsmount *pmp, u_long cn, u_long *oldcnp));
  102 int clusteralloc __P((struct msdosfsmount *pmp, u_long start, u_long count, u_long fillwith, u_long *retcluster, u_long *got));
  103 int fatentry __P((int function, struct msdosfsmount *pmp, u_long cluster, u_long *oldcontents, u_long newcontents));
  104 int freeclusterchain __P((struct msdosfsmount *pmp, u_long startchain));
  105 int extendfile __P((struct denode *dep, u_long count, struct buf **bpp, u_long *ncp, int flags));
  106 void fc_purge __P((struct denode *dep, u_int frcn));
  107 
  108 #endif  /* _KERNEL */

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