60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
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/*
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* Written by Paul Popelka (paulp@uts.amdahl.com)
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*
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* You can do anything you want with this software, just don't say you wrote
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* it, and don't remove this notice.
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*
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* This software is provided "as is".
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*
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* The author supplies this software to be publicly redistributed on the
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* understanding that the author is not responsible for the correct
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* functioning of this software in any circumstances and is not liable for
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* any damages caused by this software.
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*
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* October 1992
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*
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* $Id: fat.h,v 1.1 1993/08/13 11:35:33 cgd Exp $
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*/
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/*
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* Some useful cluster numbers.
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*/
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#define MSDOSFSROOT 0 /* cluster 0 means the root dir */
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#define CLUST_FREE 0 /* cluster 0 also means a free cluster */
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#define MSDOSFSFREE CLUST_FREE
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#define CLUST_FIRST 2 /* first legal cluster number */
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#define CLUST_RSRVS 0xfff0 /* start of reserved cluster range */
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#define CLUST_RSRVE 0xfff6 /* end of reserved cluster range */
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#define CLUST_BAD 0xfff7 /* a cluster with a defect */
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#define CLUST_EOFS 0xfff8 /* start of eof cluster range */
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#define CLUST_EOFE 0xffff /* end of eof cluster range */
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#define FAT12_MASK 0x0fff /* mask for 12 bit cluster numbers */
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#define FAT16_MASK 0xffff /* mask for 16 bit cluster numbers */
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/*
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* Return true if filesystem uses 12 bit fats. Microsoft Programmer's
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* Reference says if the maximum cluster number in a filesystem is greater
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* than 4086 then we've got a 16 bit fat filesystem.
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*/
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#define FAT12(pmp) (pmp->pm_maxcluster <= 4086)
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#define FAT16(pmp) (pmp->pm_maxcluster > 4086)
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#define MSDOSFSEOF(cn) (((cn) & 0xfff8) == 0xfff8)
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/*
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* These are the values for the function argument to the function
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* fatentry().
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*/
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#define FAT_GET 0x0001 /* get a fat entry */
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#define FAT_SET 0x0002 /* set a fat entry */
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#define FAT_GET_AND_SET (FAT_GET | FAT_SET)
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#if defined(KERNEL)
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int pcbmap __P((struct denode * dep, u_long findcn, daddr_t * bnp, u_long * cnp));
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int clusterfree __P((struct msdosfsmount * pmp, u_long cn, u_long * oldcnp));
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int clusteralloc __P((struct msdosfsmount * pmp, u_long * retcluster, u_long fillwith));
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int fatentry __P((int function, struct msdosfsmount * pmp, u_long cluster, u_long * oldcontents, u_long newcontents));
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int freeclusterchain __P((struct msdosfsmount * pmp, u_long startchain));
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#endif /* defined(KERNEL) */
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