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[unix-history] / sys / buf.h

struct buf {
       int     b_flags;
       struct  buf *b_forw;
       struct  buf *b_back;
       struct  buf *av_forw;
       struct  buf *av_back;
       int     b_dev;
       int     b_wcount;
       char    *b_addr;
       char    *b_blkno;
} buf[NBUF];

/*
* forw and back are shared with "buf" struct.
*/
struct devtab {
       char    d_active;
       char    d_errcnt;
       struct  buf *b_forw;
       struct  buf *b_back;
       struct  buf *d_actf;
       struct  buf *d_actl;
} devtab[NMAJ];

struct  buf bfreelist;

#define B_READ  01
#define B_DONE  02
#define B_ERROR 04
#define B_BUSY  010
#define B_XMEM  060
#define B_WANTED 0100
#define B_RELOC 0200
#define B_ASYNC 0400
#define B_DELWRI 01000