projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 15637ed4 RG |
1 | /* |
| 2 | * Written by Paul Popelka (paulp@uts.amdahl.com) | |
| 3 | * | |
| 4 | * You can do anything you want with this software, | |
| 5 | * just don't say you wrote it, | |
| 6 | * and don't remove this notice. | |
| 7 | * | |
| 8 | * This software is provided "as is". | |
| 9 | * | |
| 10 | * The author supplies this software to be publicly | |
| 11 | * redistributed on the understanding that the author | |
| 12 | * is not responsible for the correct functioning of | |
| 13 | * this software in any circumstances and is not liable | |
| 14 | * for any damages caused by this software. | |
| 15 | * | |
| 16 | * October 1992 | |
| 17 | * | |
| 18 | * $Header: /usr/src/CVS/sys/pcfs/fat.h,v 1.1.2.1 1993/02/07 21:57:13 friedl Exp $ | |
| 19 | * | |
| 20 | */ | |
| 21 | ||
| 22 | /* | |
| 23 | * Some useful cluster numbers. | |
| 24 | */ | |
| 25 | #define PCFSROOT 0 /* cluster 0 means the root dir */ | |
| 26 | #define CLUST_FREE 0 /* cluster 0 also means a free cluster */ | |
| 27 | #define PCFSFREE CLUST_FREE | |
| 28 | #define CLUST_FIRST 2 /* first legal cluster number */ | |
| 29 | #define CLUST_RSRVS 0xfff0 /* start of reserved cluster range */ | |
| 30 | #define CLUST_RSRVE 0xfff6 /* end of reserved cluster range */ | |
| 31 | #define CLUST_BAD 0xfff7 /* a cluster with a defect */ | |
| 32 | #define CLUST_EOFS 0xfff8 /* start of eof cluster range */ | |
| 33 | #define CLUST_EOFE 0xffff /* end of eof cluster range */ | |
| 34 | ||
| 35 | #define FAT12_MASK 0x0fff /* mask for 12 bit cluster numbers */ | |
| 36 | #define FAT16_MASK 0xffff /* mask for 16 bit cluster numbers */ | |
| 37 | ||
| 38 | /* | |
| 39 | * Return true if filesystem uses 12 bit fats. | |
| 40 | * Microsoft Programmer's Reference says if the | |
| 41 | * maximum cluster number in a filesystem is greater | |
| 42 | * than 4086 then we've got a 16 bit fat filesystem. | |
| 43 | */ | |
| 44 | #define FAT12(pmp) (pmp->pm_maxcluster <= 4086) | |
| 45 | #define FAT16(pmp) (pmp->pm_maxcluster > 4086) | |
| 46 | ||
| 47 | #define PCFSEOF(cn) (((cn) & 0xfff8) == 0xfff8) | |
| 48 | ||
| 49 | /* | |
| 50 | * These are the values for the function argument to | |
| 51 | * the function fatentry(). | |
| 52 | */ | |
| 53 | #define FAT_GET 0x0001 /* get a fat entry */ | |
| 54 | #define FAT_SET 0x0002 /* set a fat entry */ | |
| 55 | #define FAT_GET_AND_SET (FAT_GET | FAT_SET) | |
| 56 | ||
| 57 | #if defined(KERNEL) | |
| 58 | int pcbmap __P((struct denode *dep, | |
| 59 | u_long findcn, | |
| 60 | daddr_t *bnp, | |
| 61 | u_long *cnp)); | |
| 62 | int clusterfree __P((struct pcfsmount *pmp, u_long cn, u_long *oldcnp)); | |
| 63 | int clusteralloc __P((struct pcfsmount *pmp, u_long *retcluster, | |
| 64 | u_long fillwith)); | |
| 65 | int fatentry __P((int function, struct pcfsmount *pmp, | |
| 66 | u_long cluster, u_long *oldcontents, u_long newcontents)); | |
| 67 | int freeclusterchain __P((struct pcfsmount *pmp, u_long startchain)); | |
| 68 | #endif /* defined(KERNEL) */ |