cp/include/edf.h

   1 /*
   2  * (C) Copyright 2007-2011  Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   3  *
   4  * This file is released under the GPLv2.  See the COPYING file for more
   5  * details.
   6  */
   7
   8 #ifndef __EDF_H
   9 #define __EDF_H
  10
  11 #include <mutex.h>
  12 #include <device.h>
  13
  14 struct ADT {
  15         u32     IDENT;       /* VOL START / LABEL IDENTIFIER */
  16 #define __ADTIDENT 0xC3D4E2F1   /* 'CMS1' in EBCDIC */
  17         u8      ID[6];       /* VOL START / VOL IDENTIFIER */
  18         u8      VER[2];      /* VERSION LEVEL */
  19         u32     DBSIZ;       /* DISK BLOCK SIZE */
  20         u32     DOP;         /* DISK ORIGIN POINTER */
  21         u32     CYL;         /* NUM OF FORMATTED CYL ON DISK */
  22         u32     MCYL;        /* MAX NUM FORMATTED CYL ON DISK */
  23         u32     NUM;         /* Number of Blocks on disk */
  24         u32     USED;        /* Number of Blocks used */
  25         u32     FSTSZ;       /* SIZE OF FST */
  26         u32     NFST;        /* NUMBER OF FST'S PER BLOCK */
  27         u8      DCRED[6];    /* DISK CREATION DATE (YYMMDDHHMMSS) */
  28         u8      FLGL;        /* LABEL FLAG BYTE (ADTFLGL) */
  29 #define ADTCNTRY        0x01    /* Century for disk creation date (0=19, 1=20),
  30                                  * corresponds to ADTDCRED. */
  31         u8      reserved[1];
  32         u32     OFFST;       /* DISK OFFSET WHEN RESERVED */
  33         u32     AMNB;        /* ALLOC MAP BLOCK WITH NEXT HOLE */
  34         u32     AMND;        /* DISP INTO HBLK DATA OF NEXT HOLE */
  35         u32     AMUP;        /* DISP INTO USER PART OF ALLOC MAP */
  36         u32     OFCNT;       /* Count of SFS open files for this ADT */
  37         u8      SFNAM[8];    /* NAME OF SHARED SEGMENT */
  38 };
  39
  40 struct FST {
  41         u8    FNAME[8];       /* filename */
  42         u8    FTYPE[8];       /* filetype */
  43         u8    DATEW[2];       /* DATE LAST WRITTEN - MMDD */
  44         u8    TIMEW[2];       /* TIME LAST WRITTEN - HHMM */
  45         u16   WRPNT;          /* WRITE POINTER - ITEM NUMBER */
  46         u16   RDPNT;          /* READ POINTER - ITEM NUMBER */
  47         u8    FMODE[2];       /* FILE MODE - LETTER AND NUMBER */
  48         u16   RECCT;          /* NUMBER OF LOGICAL RECORDS */
  49         u16   FCLPT;          /* FIRST CHAIN LINK POINTER */
  50         u8    RECFM;          /* F*1 - RECORD FORMAT - F OR V */
  51 #define FSTDFIX        0xC6 /* Fixed record format (EBCDIC 'F') */
  52 #define FSTDVAR        0xE5 /* Variable record format (EBCDIC 'V') */
  53         u8    FLAGS;          /* F*2 - FST FLAG BYTE */
  54 #define FSTRWDSK       0x80 /* READ/WRITE DISK */
  55 #define FSTRODSK       0x00 /* READ/ONLY DISK */
  56 #define FSTDSFS        0x10 /* Shared File FST */
  57 #define FSTXRDSK       0x40 /* EXTENSION OF R/O DISK */
  58 #define FSTXWDSK       0xC0 /* EXTENSION OF R/W DISK */
  59 #define FSTEPL         0x20 /* EXTENDED PLIST */
  60 #define FSTDIA         0x40 /* ITEM AVAILABLE */
  61 #define FSTDRA         0x01 /* PREVIOUS RECORD NULL */
  62 #define FSTCNTRY       0x08 /* Century for date last written (0=19, 1=20),\\
  63                                corresponds to FSTYEARW, FSTADATI. */
  64 #define FSTACTRD       0x04 /* ACTIVE FOR READING */
  65 #define FSTACTWR       0x02 /* ACTIVE FOR WRITING */
  66 #define FSTACTPT       0x01 /* ACTIVE FROM A POINT */
  67 #define FSTFILEA       0x07 /* THE FILE IS ACTIVE */
  68         u32   LRECL;          /* LOGICAL RECORD LENGTH */
  69         u16   BLKCT;          /* NUMBER OF 800 BYTE BLOCKS */
  70         u16   YEARW;          /* YEAR LAST WRITTEN */
  71         u32   FOP;            /* ALT. FILE ORIGIN POINTER */
  72         u32   ADBC;           /* ALT. NUMBER OF DATA BLOCKS */
  73         u32   AIC;            /* ALT. ITEM COUNT */
  74         u8    NLVL;           /* NUMBER OF POINTER BLOCK LEVELS */
  75         u8    PTRSZ;          /* LENGTH OF A POINTER ELEMENT */
  76         u8    ADATI[6];       /* ALT. DATE/TIME(YY MM DD HH MM SS) */
  77         u8    REALM;          /* Real filemode */
  78         u8    FLAG2;          /* F*3 - FST FLAG BYTE 2 FSTFLAG2 */
  79 #define FSTPIPEU       0x10 /* Reserved for CMS PIPELINES usage */
  80         u8    reserved[2];
  81 };
  82
  83 #define EDF_LABEL_BLOCK_NO              3
  84
  85 #define EDF_SUPPORTED_BLOCK_SIZE        4096
  86
  87 #define DIRECTOR_FN     ((u8*) "\x00\x00\x00\x01\x00\x00\x00\x00")
  88 #define DIRECTOR_FT     ((u8*) "\xc4\xc9\xd9\xc5\xc3\xe3\xd6\xd9")
  89 #define ALLOCMAP_FN     ((u8*) "\x00\x00\x00\x02\x00\x00\x00\x00")
  90 #define ALLOCMAP_FT     ((u8*) "\xc1\xd3\xd3\xd6\xc3\xd4\xc1\xd7")
  91
  92 struct file;
  93
  94 struct fs {
  95         struct ADT ADT;
  96         struct list_head files;
  97         mutex_t lock;
  98         struct device *dev;
  99         struct file *dir;
 100 };
 101
 102 struct file {
 103         struct FST FST;
 104         struct list_head files; /* fs->files */
 105         struct list_head bcache;
 106         mutex_t lock;
 107         struct fs *fs;
 108 };
 109
 110 extern struct fs *edf_mount(struct device *dev);
 111 extern struct file *edf_lookup(struct fs *fs, char *fn, char *ft);
 112 extern int edf_read_rec(struct file *file, char *buf, u32 recno);
 113
 114 #endif