1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2/* 3 * This file contains volume label definitions for DASD devices. 4 * 5 * Copyright IBM Corp. 2005 6 * 7 * Author(s): Volker Sameske <sameske@de.ibm.com> 8 * 9 */ 10 11#ifndef _ASM_S390_VTOC_H 12#define _ASM_S390_VTOC_H 13 14#include <linux/types.h> 15 16struct vtoc_ttr 17{ 18 __u16 tt; 19 __u8 r; 20} __attribute__ ((packed)); 21 22struct vtoc_cchhb 23{ 24 __u16 cc; 25 __u16 hh; 26 __u8 b; 27} __attribute__ ((packed)); 28 29struct vtoc_cchh 30{ 31 __u16 cc; 32 __u16 hh; 33} __attribute__ ((packed)); 34 35struct vtoc_labeldate 36{ 37 __u8 year; 38 __u16 day; 39} __attribute__ ((packed)); 40 41struct vtoc_volume_label_cdl 42{ 43 char volkey[4]; /* volume key = volume label */ 44 char vollbl[4]; /* volume label */ 45 char volid[6]; /* volume identifier */ 46 __u8 security; /* security byte */ 47 struct vtoc_cchhb vtoc; /* VTOC address */ 48 char res1[5]; /* reserved */ 49 char cisize[4]; /* CI-size for FBA,... */ 50 /* ...blanks for CKD */ 51 char blkperci[4]; /* no of blocks per CI (FBA), blanks for CKD */ 52 char labperci[4]; /* no of labels per CI (FBA), blanks for CKD */ 53 char res2[4]; /* reserved */ 54 char lvtoc[14]; /* owner code for LVTOC */ 55 char res3[29]; /* reserved */ 56} __attribute__ ((packed)); 57 58struct vtoc_volume_label_ldl { 59 char vollbl[4]; /* volume label */ 60 char volid[6]; /* volume identifier */ 61 char res3[69]; /* reserved */ 62 char ldl_version; /* version number, valid for ldl format */ 63 __u64 formatted_blocks; /* valid when ldl_version >= f2 */ 64} __attribute__ ((packed)); 65 66struct vtoc_extent 67{ 68 __u8 typeind; /* extent type indicator */ 69 __u8 seqno; /* extent sequence number */ 70 struct vtoc_cchh llimit; /* starting point of this extent */ 71 struct vtoc_cchh ulimit; /* ending point of this extent */ 72} __attribute__ ((packed)); 73 74struct vtoc_dev_const 75{ 76 __u16 DS4DSCYL; /* number of logical cyls */ 77 __u16 DS4DSTRK; /* number of tracks in a logical cylinder */ 78 __u16 DS4DEVTK; /* device track length */ 79 __u8 DS4DEVI; /* non-last keyed record overhead */ 80 __u8 DS4DEVL; /* last keyed record overhead */ 81 __u8 DS4DEVK; /* non-keyed record overhead differential */ 82 __u8 DS4DEVFG; /* flag byte */ 83 __u16 DS4DEVTL; /* device tolerance */ 84 __u8 DS4DEVDT; /* number of DSCB's per track */ 85 __u8 DS4DEVDB; /* number of directory blocks per track */ 86} __attribute__ ((packed)); 87 88struct vtoc_format1_label 89{ 90 char DS1DSNAM[44]; /* data set name */ 91 __u8 DS1FMTID; /* format identifier */ 92 char DS1DSSN[6]; /* data set serial number */ 93 __u16 DS1VOLSQ; /* volume sequence number */ 94 struct vtoc_labeldate DS1CREDT; /* creation date: ydd */ 95 struct vtoc_labeldate DS1EXPDT; /* expiration date */ 96 __u8 DS1NOEPV; /* number of extents on volume */ 97 __u8 DS1NOBDB; /* no. of bytes used in last direction blk */ 98 __u8 DS1FLAG1; /* flag 1 */ 99 char DS1SYSCD[13]; /* system code */ 100 struct vtoc_labeldate DS1REFD; /* date last referenced */ 101 __u8 DS1SMSFG; /* system managed storage indicators */ 102 __u8 DS1SCXTF; /* sec. space extension flag byte */ 103 __u16 DS1SCXTV; /* secondary space extension value */ 104 __u8 DS1DSRG1; /* data set organisation byte 1 */ 105 __u8 DS1DSRG2; /* data set organisation byte 2 */ 106 __u8 DS1RECFM; /* record format */ 107 __u8 DS1OPTCD; /* option code */ 108 __u16 DS1BLKL; /* block length */ 109 __u16 DS1LRECL; /* record length */ 110 __u8 DS1KEYL; /* key length */ 111 __u16 DS1RKP; /* relative key position */ 112 __u8 DS1DSIND; /* data set indicators */ 113 __u8 DS1SCAL1; /* secondary allocation flag byte */ 114 char DS1SCAL3[3]; /* secondary allocation quantity */ 115 struct vtoc_ttr DS1LSTAR; /* last used track and block on track */ 116 __u16 DS1TRBAL; /* space remaining on last used track */ 117 __u16 res1; /* reserved */ 118 struct vtoc_extent DS1EXT1; /* first extent description */ 119 struct vtoc_extent DS1EXT2; /* second extent description */ 120 struct vtoc_extent DS1EXT3; /* third extent description */ 121 struct vtoc_cchhb DS1PTRDS; /* possible pointer to f2 or f3 DSCB */ 122} __attribute__ ((packed)); 123 124struct vtoc_format4_label 125{ 126 char DS4KEYCD[44]; /* key code for VTOC labels: 44 times 0x04 */ 127 __u8 DS4IDFMT; /* format identifier */ 128 struct vtoc_cchhb DS4HPCHR; /* highest address of a format 1 DSCB */ 129 __u16 DS4DSREC; /* number of available DSCB's */ 130 struct vtoc_cchh DS4HCCHH; /* CCHH of next available alternate track */ 131 __u16 DS4NOATK; /* number of remaining alternate tracks */ 132 __u8 DS4VTOCI; /* VTOC indicators */ 133 __u8 DS4NOEXT; /* number of extents in VTOC */ 134 __u8 DS4SMSFG; /* system managed storage indicators */ 135 __u8 DS4DEVAC; /* number of alternate cylinders. 136 * Subtract from first two bytes of 137 * DS4DEVSZ to get number of usable 138 * cylinders. can be zero. valid 139 * only if DS4DEVAV on. */ 140 struct vtoc_dev_const DS4DEVCT; /* device constants */ 141 char DS4AMTIM[8]; /* VSAM time stamp */ 142 char DS4AMCAT[3]; /* VSAM catalog indicator */ 143 char DS4R2TIM[8]; /* VSAM volume/catalog match time stamp */ 144 char res1[5]; /* reserved */ 145 char DS4F6PTR[5]; /* pointer to first format 6 DSCB */ 146 struct vtoc_extent DS4VTOCE; /* VTOC extent description */ 147 char res2[10]; /* reserved */ 148 __u8 DS4EFLVL; /* extended free-space management level */ 149 struct vtoc_cchhb DS4EFPTR; /* pointer to extended free-space info */ 150 char res3; /* reserved */ 151 __u32 DS4DCYL; /* number of logical cyls */ 152 char res4[2]; /* reserved */ 153 __u8 DS4DEVF2; /* device flags */ 154 char res5; /* reserved */ 155} __attribute__ ((packed)); 156 157struct vtoc_ds5ext 158{ 159 __u16 t; /* RTA of the first track of free extent */ 160 __u16 fc; /* number of whole cylinders in free ext. */ 161 __u8 ft; /* number of remaining free tracks */ 162} __attribute__ ((packed)); 163 164struct vtoc_format5_label 165{ 166 char DS5KEYID[4]; /* key identifier */ 167 struct vtoc_ds5ext DS5AVEXT; /* first available (free-space) extent. */ 168 struct vtoc_ds5ext DS5EXTAV[7]; /* seven available extents */ 169 __u8 DS5FMTID; /* format identifier */ 170 struct vtoc_ds5ext DS5MAVET[18]; /* eighteen available extents */ 171 struct vtoc_cchhb DS5PTRDS; /* pointer to next format5 DSCB */ 172} __attribute__ ((packed)); 173 174struct vtoc_ds7ext 175{ 176 __u32 a; /* starting RTA value */ 177 __u32 b; /* ending RTA value + 1 */ 178} __attribute__ ((packed)); 179 180struct vtoc_format7_label 181{ 182 char DS7KEYID[4]; /* key identifier */ 183 struct vtoc_ds7ext DS7EXTNT[5]; /* space for 5 extent descriptions */ 184 __u8 DS7FMTID; /* format identifier */ 185 struct vtoc_ds7ext DS7ADEXT[11]; /* space for 11 extent descriptions */ 186 char res1[2]; /* reserved */ 187 struct vtoc_cchhb DS7PTRDS; /* pointer to next FMT7 DSCB */ 188} __attribute__ ((packed)); 189 190struct vtoc_cms_label { 191 __u8 label_id[4]; /* Label identifier */ 192 __u8 vol_id[6]; /* Volid */ 193 __u16 version_id; /* Version identifier */ 194 __u32 block_size; /* Disk block size */ 195 __u32 origin_ptr; /* Disk origin pointer */ 196 __u32 usable_count; /* Number of usable cylinders/blocks */ 197 __u32 formatted_count; /* Maximum number of formatted cylinders/ 198 * blocks */ 199 __u32 block_count; /* Disk size in CMS blocks */ 200 __u32 used_count; /* Number of CMS blocks in use */ 201 __u32 fst_size; /* File Status Table (FST) size */ 202 __u32 fst_count; /* Number of FSTs per CMS block */ 203 __u8 format_date[6]; /* Disk FORMAT date */ 204 __u8 reserved1[2]; 205 __u32 disk_offset; /* Disk offset when reserved*/ 206 __u32 map_block; /* Allocation Map Block with next hole */ 207 __u32 hblk_disp; /* Displacement into HBLK data of next hole */ 208 __u32 user_disp; /* Displacement into user part of Allocation 209 * map */ 210 __u8 reserved2[4]; 211 __u8 segment_name[8]; /* Name of shared segment */ 212} __attribute__ ((packed)); 213 214#endif /* _ASM_S390_VTOC_H */ 215