minix/servers/vfs/dmap.h

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/*
dmap.h
*/
/*===========================================================================*
* Device <-> Driver Table *
*===========================================================================*/
/* Device table. This table is indexed by major device number. It provides
* the link between major device numbers and the routines that process them.
* The table can be update dynamically. The field 'dmap_flags' describe an
* entry's current status and determines what control options are possible.
*/
#define DMAP_MUTABLE 0x01 /* mapping can be overtaken */
#define DMAP_BUSY 0x02 /* driver busy with request */
#define DMAP_BABY 0x04 /* driver exec() not done yet */
extern struct dmap {
int _PROTOTYPE ((*dmap_opcl), (int, Dev_t, int, int) );
int _PROTOTYPE ((*dmap_io), (int, message *) );
endpoint_t dmap_driver;
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int dmap_flags;
char dmap_label[16];
int dmap_async_driver;
struct filp *dmap_sel_filp;
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} dmap[];