include/asm-s390/vtoc.h

   1 /*
   2  * include/asm-s390/vtoc.h
   3  *
   4  * This file contains volume label definitions for DASD devices.
   5  *
   6  * (C) Copyright IBM Corp. 2005
   7  *
   8  * Author(s): Volker Sameske <sameske@de.ibm.com>
   9  *
  10  */
  11
  12 #ifndef _ASM_S390_VTOC_H
  13 #define _ASM_S390_VTOC_H
  14
  15 #include <linux/types.h>
  16
  17 struct vtoc_ttr
  18 {
  19         __u16 tt;
  20         __u8 r;
  21 } __attribute__ ((packed));
  22
  23 struct vtoc_cchhb
  24 {
  25         __u16 cc;
  26         __u16 hh;
  27         __u8 b;
  28 } __attribute__ ((packed));
  29
  30 struct vtoc_cchh
  31 {
  32         __u16 cc;
  33         __u16 hh;
  34 } __attribute__ ((packed));
  35
  36 struct vtoc_labeldate
  37 {
  38         __u8 year;
  39         __u16 day;
  40 } __attribute__ ((packed));
  41
  42 struct vtoc_volume_label
  43 {
  44         char volkey[4];         /* volume key = volume label */
  45         char vollbl[4];         /* volume label */
  46         char volid[6];          /* volume identifier */
  47         __u8 security;          /* security byte */
  48         struct vtoc_cchhb vtoc; /* VTOC address */
  49         char res1[5];           /* reserved */
  50         char cisize[4];         /* CI-size for FBA,... */
  51                                 /* ...blanks for CKD */
  52         char blkperci[4];       /* no of blocks per CI (FBA), blanks for CKD */
  53         char labperci[4];       /* no of labels per CI (FBA), blanks for CKD */
  54         char res2[4];           /* reserved */
  55         char lvtoc[14];         /* owner code for LVTOC */
  56         char res3[29];          /* reserved */
  57 } __attribute__ ((packed));
  58
  59 struct vtoc_extent
  60 {
  61         __u8 typeind;                   /* extent type indicator */
  62         __u8 seqno;                     /* extent sequence number */
  63         struct vtoc_cchh llimit;        /* starting point of this extent */
  64         struct vtoc_cchh ulimit;        /* ending point of this extent */
  65 } __attribute__ ((packed));
  66
  67 struct vtoc_dev_const
  68 {
  69         __u16 DS4DSCYL; /* number of logical cyls */
  70         __u16 DS4DSTRK; /* number of tracks in a logical cylinder */
  71         __u16 DS4DEVTK; /* device track length */
  72         __u8 DS4DEVI;   /* non-last keyed record overhead */
  73         __u8 DS4DEVL;   /* last keyed record overhead */
  74         __u8 DS4DEVK;   /* non-keyed record overhead differential */
  75         __u8 DS4DEVFG;  /* flag byte */
  76         __u16 DS4DEVTL; /* device tolerance */
  77         __u8 DS4DEVDT;  /* number of DSCB's per track */
  78         __u8 DS4DEVDB;  /* number of directory blocks per track */
  79 } __attribute__ ((packed));
  80
  81 struct vtoc_format1_label
  82 {
  83         char DS1DSNAM[44];      /* data set name */
  84         __u8 DS1FMTID;          /* format identifier */
  85         char DS1DSSN[6];        /* data set serial number */
  86         __u16 DS1VOLSQ;         /* volume sequence number */
  87         struct vtoc_labeldate DS1CREDT; /* creation date: ydd */
  88         struct vtoc_labeldate DS1EXPDT; /* expiration date */
  89         __u8 DS1NOEPV;          /* number of extents on volume */
  90         __u8 DS1NOBDB;          /* no. of bytes used in last direction blk */
  91         __u8 DS1FLAG1;          /* flag 1 */
  92         char DS1SYSCD[13];      /* system code */
  93         struct vtoc_labeldate DS1REFD; /* date last referenced  */
  94         __u8 DS1SMSFG;          /* system managed storage indicators */
  95         __u8 DS1SCXTF;          /* sec. space extension flag byte */
  96         __u16 DS1SCXTV;         /* secondary space extension value */
  97         __u8 DS1DSRG1;          /* data set organisation byte 1 */
  98         __u8 DS1DSRG2;          /* data set organisation byte 2 */
  99         __u8 DS1RECFM;          /* record format */
 100         __u8 DS1OPTCD;          /* option code */
 101         __u16 DS1BLKL;          /* block length */
 102         __u16 DS1LRECL;         /* record length */
 103         __u8 DS1KEYL;           /* key length */
 104         __u16 DS1RKP;           /* relative key position */
 105         __u8 DS1DSIND;          /* data set indicators */
 106         __u8 DS1SCAL1;          /* secondary allocation flag byte */
 107         char DS1SCAL3[3];       /* secondary allocation quantity */
 108         struct vtoc_ttr DS1LSTAR; /* last used track and block on track */
 109         __u16 DS1TRBAL;         /* space remaining on last used track */
 110         __u16 res1;             /* reserved */
 111         struct vtoc_extent DS1EXT1; /* first extent description */
 112         struct vtoc_extent DS1EXT2; /* second extent description */
 113         struct vtoc_extent DS1EXT3; /* third extent description */
 114         struct vtoc_cchhb DS1PTRDS; /* possible pointer to f2 or f3 DSCB */
 115 } __attribute__ ((packed));
 116
 117 struct vtoc_format4_label
 118 {
 119         char DS4KEYCD[44];      /* key code for VTOC labels: 44 times 0x04 */
 120         __u8 DS4IDFMT;          /* format identifier */
 121         struct vtoc_cchhb DS4HPCHR; /* highest address of a format 1 DSCB */
 122         __u16 DS4DSREC;         /* number of available DSCB's */
 123         struct vtoc_cchh DS4HCCHH; /* CCHH of next available alternate track */
 124         __u16 DS4NOATK;         /* number of remaining alternate tracks */
 125         __u8 DS4VTOCI;          /* VTOC indicators */
 126         __u8 DS4NOEXT;          /* number of extents in VTOC */
 127         __u8 DS4SMSFG;          /* system managed storage indicators */
 128         __u8 DS4DEVAC;          /* number of alternate cylinders.
 129                                  * Subtract from first two bytes of
 130                                  * DS4DEVSZ to get number of usable
 131                                  * cylinders. can be zero. valid
 132                                  * only if DS4DEVAV on. */
 133         struct vtoc_dev_const DS4DEVCT; /* device constants */
 134         char DS4AMTIM[8];       /* VSAM time stamp */
 135         char DS4AMCAT[3];       /* VSAM catalog indicator */
 136         char DS4R2TIM[8];       /* VSAM volume/catalog match time stamp */
 137         char res1[5];           /* reserved */
 138         char DS4F6PTR[5];       /* pointer to first format 6 DSCB */
 139         struct vtoc_extent DS4VTOCE; /* VTOC extent description */
 140         char res2[10];          /* reserved */
 141         __u8 DS4EFLVL;          /* extended free-space management level */
 142         struct vtoc_cchhb DS4EFPTR; /* pointer to extended free-space info */
 143         char res3[9];           /* reserved */
 144 } __attribute__ ((packed));
 145
 146 struct vtoc_ds5ext
 147 {
 148         __u16 t;        /* RTA of the first track of free extent */
 149         __u16 fc;       /* number of whole cylinders in free ext. */
 150         __u8 ft;        /* number of remaining free tracks */
 151 } __attribute__ ((packed));
 152
 153 struct vtoc_format5_label
 154 {
 155         char DS5KEYID[4];       /* key identifier */
 156         struct vtoc_ds5ext DS5AVEXT; /* first available (free-space) extent. */
 157         struct vtoc_ds5ext DS5EXTAV[7]; /* seven available extents */
 158         __u8 DS5FMTID;          /* format identifier */
 159         struct vtoc_ds5ext DS5MAVET[18]; /* eighteen available extents */
 160         struct vtoc_cchhb DS5PTRDS; /* pointer to next format5 DSCB */
 161 } __attribute__ ((packed));
 162
 163 struct vtoc_ds7ext
 164 {
 165         __u32 a; /* starting RTA value */
 166         __u32 b; /* ending RTA value + 1 */
 167 } __attribute__ ((packed));
 168
 169 struct vtoc_format7_label
 170 {
 171         char DS7KEYID[4];       /* key identifier */
 172         struct vtoc_ds7ext DS7EXTNT[5]; /* space for 5 extent descriptions */
 173         __u8 DS7FMTID;          /* format identifier */
 174         struct vtoc_ds7ext DS7ADEXT[11]; /* space for 11 extent descriptions */
 175         char res1[2];           /* reserved */
 176         struct vtoc_cchhb DS7PTRDS; /* pointer to next FMT7 DSCB */
 177 } __attribute__ ((packed));
 178
 179 struct vtoc_cms_label {
 180         __u8 label_id[4];               /* Label identifier */
 181         __u8 vol_id[6];         /* Volid */
 182         __u16 version_id;               /* Version identifier */
 183         __u32 block_size;               /* Disk block size */
 184         __u32 origin_ptr;               /* Disk origin pointer */
 185         __u32 usable_count;     /* Number of usable cylinders/blocks */
 186         __u32 formatted_count;  /* Maximum number of formatted cylinders/
 187                                  * blocks */
 188         __u32 block_count;      /* Disk size in CMS blocks */
 189         __u32 used_count;               /* Number of CMS blocks in use */
 190         __u32 fst_size;         /* File Status Table (FST) size */
 191         __u32 fst_count;                /* Number of FSTs per CMS block */
 192         __u8 format_date[6];    /* Disk FORMAT date */
 193         __u8 reserved1[2];
 194         __u32 disk_offset;      /* Disk offset when reserved*/
 195         __u32 map_block;                /* Allocation Map Block with next hole */
 196         __u32 hblk_disp;                /* Displacement into HBLK data of next hole */
 197         __u32 user_disp;                /* Displacement into user part of Allocation
 198                                  * map */
 199         __u8 reserved2[4];
 200         __u8 segment_name[8];   /* Name of shared segment */
 201 } __attribute__ ((packed));
 202
 203 #endif /* _ASM_S390_VTOC_H */