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/fs/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  * SPDX-License-Identifier: BSD-4-Clause
    6  *
    7  * Copyright (C) 1994, 1997 Wolfgang Solfrank.
    8  * Copyright (C) 1994, 1997 TooLs GmbH.
    9  * All rights reserved.
   10  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. All advertising materials mentioning features or use of this software
   21  *    must display the following acknowledgement:
   22  *      This product includes software developed by TooLs GmbH.
   23  * 4. The name of TooLs GmbH may not be used to endorse or promote products
   24  *    derived from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
   27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   29  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   31  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   32  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   33  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   34  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   35  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   36  */
   37 /*-
   38  * Written by Paul Popelka (paulp@uts.amdahl.com)
   39  *
   40  * You can do anything you want with this software, just don't say you wrote
   41  * it, and don't remove this notice.
   42  *
   43  * This software is provided "as is".
   44  *
   45  * The author supplies this software to be publicly redistributed on the
   46  * understanding that the author is not responsible for the correct
   47  * functioning of this software in any circumstances and is not liable for
   48  * any damages caused by this software.
   49  *
   50  * October 1992
   51  */
   52 
   53 #ifndef _FS_MSDOSFS_FAT_H_
   54 #define _FS_MSDOSFS_FAT_H_
   55 /*
   56  * Some useful cluster numbers.
   57  */
   58 #define MSDOSFSROOT     0               /* cluster 0 means the root dir */
   59 #define CLUST_FREE      0               /* cluster 0 also means a free cluster */
   60 #define MSDOSFSFREE     CLUST_FREE
   61 #define CLUST_FIRST     2               /* first legal cluster number */
   62 #define CLUST_RSRVD     0xfffffff6      /* reserved cluster range */
   63 #define CLUST_BAD       0xfffffff7      /* a cluster with a defect */
   64 #define CLUST_EOFS      0xfffffff8      /* start of eof cluster range */
   65 #define CLUST_EOFE      0xffffffff      /* end of eof cluster range */
   66 
   67 #define FAT12_MASK      0x00000fff      /* mask for 12 bit cluster numbers */
   68 #define FAT16_MASK      0x0000ffff      /* mask for 16 bit cluster numbers */
   69 #define FAT32_MASK      0x0fffffff      /* mask for FAT32 cluster numbers */
   70 
   71 /*
   72  * MSDOSFS:
   73  * Return true if filesystem uses 12 bit FATs. Microsoft Programmer's
   74  * Reference says if the maximum cluster number in a filesystem is greater
   75  * than 4084 ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK) then we've got a
   76  * 16 bit FAT filesystem. While mounting, the result of this test is stored
   77  * in pm_fatentrysize.
   78  */
   79 #define FAT12(pmp)      (pmp->pm_fatmask == FAT12_MASK)
   80 #define FAT16(pmp)      (pmp->pm_fatmask == FAT16_MASK)
   81 #define FAT32(pmp)      (pmp->pm_fatmask == FAT32_MASK)
   82 
   83 #define MSDOSFSEOF(pmp, cn)     ((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS)
   84 
   85 #if defined (_KERNEL) || defined(MAKEFS)
   86 /*
   87  * These are the values for the function argument to the function
   88  * fatentry().
   89  */
   90 #define FAT_GET         0x0001  /* get a FAT entry */
   91 #define FAT_SET         0x0002  /* set a FAT entry */
   92 #define FAT_GET_AND_SET (FAT_GET | FAT_SET)
   93 
   94 /*
   95  * Flags to extendfile:
   96  */
   97 #define DE_CLEAR        1       /* Zero out the blocks allocated */
   98 
   99 int pcbmap(struct denode *dep, u_long findcn, daddr_t *bnp, u_long *cnp, int* sp);
  100 int clusterfree(struct msdosfsmount *pmp, u_long cn, u_long *oldcnp);
  101 int clusteralloc(struct msdosfsmount *pmp, u_long start, u_long count, u_long fillwith, u_long *retcluster, u_long *got);
  102 int fatentry(int function, struct msdosfsmount *pmp, u_long cluster, u_long *oldcontents, u_long newcontents);
  103 int freeclusterchain(struct msdosfsmount *pmp, u_long startchain);
  104 int extendfile(struct denode *dep, u_long count, struct buf **bpp, u_long *ncp, int flags);
  105 void fc_purge(struct denode *dep, u_int frcn);
  106 int markvoldirty_upgrade(struct msdosfsmount *pmp, bool dirty, bool rw_upgrade);
  107 
  108 static inline int
  109 markvoldirty(struct msdosfsmount *pmp, bool dirty)
  110 {
  111         return (markvoldirty_upgrade(pmp, dirty, false));
  112 }
  113 
  114 #endif  /* _KERNEL || MAKEFS */
  115 #endif  /* !_FS_MSDOSFS_FAT_H_ */

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