![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to buf.h CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [MW Coherent from dump] / coherent / f / usr / include.78 / sys|
Return to buf.h CVS log | Up to [MW Coherent from dump] / coherent / f / usr / include.78 / sys |
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 */
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.