135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/* @(#)53 1.10 src/bos/usr/include/IN/PCdefs.h, libIN, bos411, 9428A410j 6/16/90 00:17:26 */
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/*
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* COMPONENT_NAME: LIBIN
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*
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* FUNCTIONS:
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*
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* ORIGINS: 9,27
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*
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* (C) COPYRIGHT International Business Machines Corp. 1988, 1989
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* All Rights Reserved
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* Licensed Materials - Property of IBM
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*
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* US Government Users Restricted Rights - Use, duplication or
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* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
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*
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*/
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#ifndef _H_PCDEFS
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#define _H_PCDEFS
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/*
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* I suppose we must really start at the basics.
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* Here are the basic types:
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*/
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typedef struct { char c[4]; } pclong;
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typedef short pcint;
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typedef short pcshort;
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typedef char pcchar;
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/*
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* Here are some simple derived types.
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*/
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typedef pclong pcdaddr_t;
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typedef pcshort pcushort;
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typedef pcushort pcino_t;
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typedef pclong pctime_t;
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typedef pclong pcoff_t;
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/* These haven't been needed yet. Define them when you will. */
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/* typedef struct { int r[1]; } * physadr; */
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/* typedef char * caddr_t; */
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/* typedef short dev_t; */
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/* typedef pclong pcpaddr_t; */
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/* typedef char cnt_t; */
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/* typedef int label_t[5]; */
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/*
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* Now that we have the types, let us try to convert some of them.
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*/
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/*
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* First, some ways to convert basic PC types to
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* basic aiws types.
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*/
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#define PCchar(X) (X)
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#define PCshort(X) (((X>>8)&0x00ff)|((X<<8)&0xff00))
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extern long PClongin();
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extern pclong PClongout();
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/*
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* Next, some ways to convert -typedef-ed types
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* to AIWS types.
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*/
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#define PCushort(X) PCshort(X)
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#define PCino(X) PCushort(X)
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#define PCdaddrin(X) PClongin(X)
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#define PCdaddrout(X) PClongout(X)
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#define PCtimein(X) PClongin(X)
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#define PCtimeout(X) PClongout(X)
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#define PCoffin(X) PClongin(X)
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#define PCoffout(X) PClongout(X)
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/*
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* Useful information we all need.
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*/
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#define PCNICFREE 50
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#define PCNICINOD 100
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#define PCBSIZE 512
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#define PCISIZE 64 /* same as sizeof (struct dinode) */
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#define PCBSHIFT 9
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#define PCBNSHIFT 7
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#define PCINOPB 8
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#define PCINOSHIFT 3
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#define PCitod(x) (daddr_t)(((unsigned)(x)+(2*PCINOPB-1))>>PCINOSHIFT)
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#define PCitoo(x) (int)(((unsigned)(x)+(2*PCINOPB-1))&(PCINOPB-1))
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/* pcfblk has a different definition. */
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struct pcfblk
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{
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pcint pc_nfree;
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pcdaddr_t pc_free[PCNICFREE];
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};
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/*
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* Structure of the super-block
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*/
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struct pcfilsys
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{
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pcushort pc_isize; /* size in blocks of i-list */
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pcdaddr_t pc_fsize; /* size in blocks of entire volume */
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pcshort pc_nfree; /* number of addresses in s_free */
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pcdaddr_t pc_free[PCNICFREE]; /* free block list */
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pcshort pc_ninode; /* number of i-nodes in s_inode */
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pcino_t pc_inode[PCNICINOD]; /* free i-node list */
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pcchar pc_flock; /* lock during free list manipulation */
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pcchar pc_ilock; /* lock during i-list manipulation */
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pcchar pc_fmod; /* super block modified flag */
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pcchar pc_ronly; /* mounted read-only flag */
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pctime_t pc_time; /* last super block update */
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pcshort pc_dinfo[4]; /* device information */
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pcdaddr_t pc_tfree; /* total free blocks*/
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pcino_t pc_tinode; /* total free inodes */
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pcchar pc_fname[6]; /* file system name */
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pcchar pc_fpack[6]; /* file system pack name */
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pclong pc_fill[13]; /* round out to 512 byte boundary */
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pcdaddr_t pc_swaplo;
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pcdaddr_t pc_nswap;
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pclong pc_magic;
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pclong pc_type;
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};
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/*
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* macros to give more meaningful names to dinfo fields
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*/
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#define pc_m pc_dinfo[0] /* modulo factor in superblock */
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#define pc_n pc_dinfo[1] /* cylinder size in super block */
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#define pc_bsize pc_dinfo[2] /* block size for this file system */
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# define PCFsMAGIC 0xFD187E20 /* s_magic number */
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#endif /* _H_PCDEFS */
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