typedef struct Disk     Disk;

/*
*  Reference to the disk
*/
struct Disk
{
       Bcache;
       ulong   nb;     /* number of blocks */
       ulong   nab;    /* number of allocation blocks */
       int     b2b;    /* allocation bits to a block */
       int     p2b;    /* Dptr's per page */
       char    name[CACHENAMELEN];
};

int     dinit(Disk*, int, int, char*);
int     dformat(Disk*, int, char*, ulong, ulong);
ulong   dalloc(Disk*, Dptr*);
ulong   dpalloc(Disk*, Dptr*);
int     dfree(Disk*, Dptr*);

extern int debug;

#define DPRINT if(debug)fprint

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