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Length: 1722 (0x6ba)
Types: TextFile
Notes: UNIX file
Names: »buf.h«
└─⟦f27320a65⟧ Bits:30001972 Commodore 900 hard disk image with partial source code
└─⟦2d53db1df⟧ UNIX Filesystem
└─⟦this⟧ »frankh/src/tape_drive/buf.h«
/*
* Buffer header.
*/
#ifndef BUF_H
#define BUF_H
#include <types.h>
typedef struct buf {
struct buf *b_actf; /* First in queue */
struct buf *b_actl; /* Last in queue */
GATE b_gate; /* Gate */
unsigned b_flag; /* Flags */
dev_t b_dev; /* Device */
daddr_t b_bno; /* Block number */
char b_req; /* I/O type */
char b_err; /* Error */
unsigned b_seqn; /* Buffer sequence number */
bold_t b_map; /* Old map */
vaddr_t b_count; /* Size of I/O */
vaddr_t b_resid; /* Driver returns count here */
char *b_vaddr; /* Virtual address */
paddr_t b_paddr; /* Physical address */
} BUF;
/*
* Flags (b_flags).
*/
#define BFNTP 0000001 /* Buffer not valid */
#define BFREQ 0000002 /* Buffer requested */
#define BFERR 0000004 /* Error */
#define BFMOD 0000010 /* Data has been modified */
#define BFASY 0000020 /* Asynchrous */
#define BFMAP 0000040 /* Buffer has been mapped */
#define BFRAW 0000100 /* Request is raw */
#define BFTAP 0000200 /* Request is to a tape */
#define BFBLK 0040000 /* Aligned on a block boundary */
#define BFIOC 0100000 /* Perform bounds checking */
/*
* Requests.
*/
#define BREAD 1 /* Read */
#define BWRITE 2 /* Write */
#ifdef KERNEL
/*
* Functions.
*/
extern BUF *bread(); /* bio.c */
extern BUF *bclaim(); /* bio.c */
extern BUF *vread(); /* fs3.c */
extern BUF *aread(); /* fs3.c */
extern daddr_t vmap(); /* fs3.c */
extern int *lmap(); /* fs3.c */
#endif
#ifdef KERNEL
/*
* Global variables.
*/
extern unsigned bufseqn; /* Buffer sequencer */
extern int bufneed; /* Buffer is needed */
extern BUF swapbuf; /* Buffer for swap I/O */
extern BUF *bufl; /* Buffer headers */
#endif
#endif