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Annotation of coherent/f/usr/include.78/sys/buf.h, revision 1.1

1.1     ! root        1: /* (-lgl
        !             2:  *     COHERENT Version 4.0
        !             3:  *     Copyright (c) 1982, 1992 by Mark Williams Company.
        !             4:  *     All rights reserved. May not be copied without permission.
        !             5:  -lgl) */
        !             6: /*
        !             7:  * /usr/include/sys/buf.h
        !             8:  *
        !             9:  * Buffer header.
        !            10:  *
        !            11:  * Revised: Wed Apr  7 15:05:36 1993 CDT
        !            12:  */
        !            13: #ifndef  __SYS_BUF_H__
        !            14: #define  __SYS_BUF_H__
        !            15: 
        !            16: #include <sys/__paddr.h>
        !            17: #include <sys/types.h>
        !            18: #include <sys/ksynch.h>
        !            19: 
        !            20: typedef struct buf {
        !            21:        struct   buf *b_actf;           /* First in queue */
        !            22:        struct   buf *b_actl;           /* Last in queue */
        !            23:        GATE     b_gate;                /* Gate */
        !            24:        unsigned b_flag;                /* Flags */
        !            25:        dev_t    b_dev;                 /* Device */
        !            26:        daddr_t  b_bno;                 /* Block number */
        !            27:        char     b_req;                 /* I/O type */
        !            28:        char     b_err;                 /* Error */
        !            29:        unsigned b_seqn;                /* Buffer sequence number */
        !            30: #ifndef _I386
        !            31:        bold_t   b_map;                 /* Old map */
        !            32:        vaddr_t  b_count;               /* Size of I/O */
        !            33:        vaddr_t  b_resid;               /* Driver returns count here */
        !            34:        faddr_t  b_faddr;               /* Far Virtual address */
        !            35:        __paddr_t        b_paddr;       /* Physical address */
        !            36: #else
        !            37:        off_t    b_count;               /* Size of I/O */
        !            38:        off_t    b_resid;               /* Driver returns count here */
        !            39:        __paddr_t        b_paddr;       /*      physical  address (bytes) */
        !            40:        caddr_t  b_vaddr;               /* kernel virtual address (bytes) */
        !            41:        unsigned long b_hashval;        /* used to index into hasharray[] */
        !            42:        struct   buf *b_LRUf;           /* Next (older) in LRU chain */
        !            43:        struct   buf *b_LRUb;           /* Previous (newer) in LRU chain */
        !            44:        struct   buf *b_hashf;          /* Next in this hash chain */
        !            45:        struct   buf *b_hashb;          /* Previous in this hash chain */
        !            46: #endif /* _I386 */
        !            47: } BUF;
        !            48: 
        !            49: /*
        !            50:  * Flags (b_flags).
        !            51:  */
        !            52: #define BFNTP  0x0001                  /* Buffer not valid */
        !            53: #define BFREQ  0x0002                  /* Buffer requested */
        !            54: #define BFERR  0x0004                  /* Error */
        !            55: #define BFMOD  0x0008                  /* Data has been modified */
        !            56: #define BFASY  0x0010                  /* Asynchrous */
        !            57: #define BFMAP  0x0020                  /* Buffer has been mapped */
        !            58: #define BFRAW  0x0040                  /* Request is raw */
        !            59: #define BFTAP  0x0080                  /* Request is to a tape */
        !            60: 
        !            61: #define BFBLK  0x4000                  /* Aligned on a block boundary */
        !            62: #define BFIOC  0x8000                  /* Perform bounds checking */
        !            63: 
        !            64: /*
        !            65:  * Requests.
        !            66:  */
        !            67: #define        BREAD   1                       /* Read */
        !            68: #define BWRITE 2                       /* Write */
        !            69: /* sad but true, floppy driver uses these: */
        !            70: #define        BFLSTAT 3                       /* Floppy Drive Status */
        !            71: #define BFLFMT 4                       /* Floppy Disk Format */
        !            72: 
        !            73: #define        BNULL   ((BUF *)0)
        !            74: 
        !            75: #ifdef KERNEL
        !            76: /*
        !            77:  * Functions.
        !            78:  */
        !            79: extern BUF      *bread();              /* bio.c */
        !            80: extern BUF      *bclaim();             /* bio.c */
        !            81: extern BUF      *vread();              /* fs3.c */
        !            82: extern BUF      *aread();              /* fs3.c */
        !            83: extern daddr_t  vmap();                /* fs3.c */
        !            84: extern int      *lmap();               /* fs3.c */
        !            85: 
        !            86: /*
        !            87:  * Global variables.
        !            88:  */
        !            89: extern unsigned bufseqn;               /* Buffer sequencer */
        !            90: extern int      bufneed;               /* Buffer is needed */
        !            91: extern BUF      swapbuf;               /* Buffer for swap I/O */
        !            92: extern BUF      *bufl;                 /* Buffer headers */
        !            93: #endif /* KERNEL */
        !            94: 
        !            95: #endif /* BUF_H */

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