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Annotation of coherent/c/usr/include/sys/buf.h, revision 1.1.1.1

1.1       root        1: /* (-lgl
                      2:  *     COHERENT Version 3.0
                      3:  *     Copyright (c) 1982, 1990 by Mark Williams Company.
                      4:  *     All rights reserved. May not be copied without permission.
                      5:  -lgl) */
                      6: /*
                      7:  * Buffer header.
                      8:  */
                      9: #ifndef        BUF_H   BUF_H
                     10: #define         BUF_H
                     11: 
                     12: #include <sys/types.h>
                     13: 
                     14: typedef struct buf {
                     15:        struct   buf *b_actf;           /* First in queue */
                     16:        struct   buf *b_actl;           /* Last in queue */
                     17:        GATE     b_gate;                /* Gate */
                     18:        unsigned b_flag;                /* Flags */
                     19:        dev_t    b_dev;                 /* Device */
                     20:        daddr_t  b_bno;                 /* Block number */
                     21:        char     b_req;                 /* I/O type */
                     22:        char     b_err;                 /* Error */
                     23:        unsigned b_seqn;                /* Buffer sequence number */
                     24:        bold_t   b_map;                 /* Old map */
                     25:        vaddr_t  b_count;               /* Size of I/O */
                     26:        vaddr_t  b_resid;               /* Driver returns count here */
                     27:        faddr_t  b_faddr;               /* Far Virtual address */
                     28:        paddr_t  b_paddr;               /* Physical address */
                     29: } BUF;
                     30: 
                     31: /*
                     32:  * Flags (b_flags).
                     33:  */
                     34: #define BFNTP  0000001                 /* Buffer not valid */
                     35: #define BFREQ  0000002                 /* Buffer requested */
                     36: #define BFERR  0000004                 /* Error */
                     37: #define BFMOD  0000010                 /* Data has been modified */
                     38: #define BFASY  0000020                 /* Asynchrous */
                     39: #define BFMAP  0000040                 /* Buffer has been mapped */
                     40: #define BFRAW  0000100                 /* Request is raw */
                     41: #define BFTAP  0000200                 /* Request is to a tape */
                     42: 
                     43: #define BFBLK  0040000                 /* Aligned on a block boundary */
                     44: #define BFIOC  0100000                 /* Perform bounds checking */
                     45: 
                     46: /*
                     47:  * Requests.
                     48:  */
                     49: #define        BREAD   1                       /* Read */
                     50: #define BWRITE 2                       /* Write */
                     51: 
                     52: #ifdef KERNEL
                     53: /*
                     54:  * Functions.
                     55:  */
                     56: extern BUF      *bread();              /* bio.c */
                     57: extern BUF      *bclaim();             /* bio.c */
                     58: extern BUF      *vread();              /* fs3.c */
                     59: extern BUF      *aread();              /* fs3.c */
                     60: extern daddr_t  vmap();                /* fs3.c */
                     61: extern int      *lmap();               /* fs3.c */
                     62: 
                     63: #endif
                     64: 
                     65: #ifdef KERNEL
                     66: /*
                     67:  * Global variables.
                     68:  */
                     69: extern unsigned bufseqn;               /* Buffer sequencer */
                     70: extern int      bufneed;               /* Buffer is needed */
                     71: extern BUF      swapbuf;               /* Buffer for swap I/O */
                     72: extern BUF      *bufl;                 /* Buffer headers */
                     73: 
                     74: #endif
                     75: 
                     76: #endif

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