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b44b0ab3ba
The dasd device driver will now support ECKD devices with more then 65520 cylinders. In the traditional ECKD adressing scheme each track is addressed by a 16-bit cylinder and 16-bit head number. The new addressing scheme makes use of the fact that the actual number of heads is never larger then 15, so 12 bits of the head number can be redefined to be part of the cylinder address. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
216 lines
7.3 KiB
C
216 lines
7.3 KiB
C
/*
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* include/asm-s390/vtoc.h
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*
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* This file contains volume label definitions for DASD devices.
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*
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* (C) Copyright IBM Corp. 2005
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*
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* Author(s): Volker Sameske <sameske@de.ibm.com>
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*
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*/
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#ifndef _ASM_S390_VTOC_H
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#define _ASM_S390_VTOC_H
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#include <linux/types.h>
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struct vtoc_ttr
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{
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__u16 tt;
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__u8 r;
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} __attribute__ ((packed));
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struct vtoc_cchhb
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{
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__u16 cc;
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__u16 hh;
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__u8 b;
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} __attribute__ ((packed));
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struct vtoc_cchh
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{
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__u16 cc;
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__u16 hh;
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} __attribute__ ((packed));
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struct vtoc_labeldate
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{
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__u8 year;
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__u16 day;
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} __attribute__ ((packed));
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struct vtoc_volume_label_cdl
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{
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char volkey[4]; /* volume key = volume label */
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char vollbl[4]; /* volume label */
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char volid[6]; /* volume identifier */
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__u8 security; /* security byte */
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struct vtoc_cchhb vtoc; /* VTOC address */
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char res1[5]; /* reserved */
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char cisize[4]; /* CI-size for FBA,... */
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/* ...blanks for CKD */
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char blkperci[4]; /* no of blocks per CI (FBA), blanks for CKD */
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char labperci[4]; /* no of labels per CI (FBA), blanks for CKD */
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char res2[4]; /* reserved */
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char lvtoc[14]; /* owner code for LVTOC */
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char res3[29]; /* reserved */
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} __attribute__ ((packed));
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struct vtoc_volume_label_ldl {
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char vollbl[4]; /* volume label */
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char volid[6]; /* volume identifier */
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char res3[69]; /* reserved */
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char ldl_version; /* version number, valid for ldl format */
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__u64 formatted_blocks; /* valid when ldl_version >= f2 */
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} __attribute__ ((packed));
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struct vtoc_extent
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{
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__u8 typeind; /* extent type indicator */
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__u8 seqno; /* extent sequence number */
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struct vtoc_cchh llimit; /* starting point of this extent */
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struct vtoc_cchh ulimit; /* ending point of this extent */
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} __attribute__ ((packed));
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struct vtoc_dev_const
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{
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__u16 DS4DSCYL; /* number of logical cyls */
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__u16 DS4DSTRK; /* number of tracks in a logical cylinder */
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__u16 DS4DEVTK; /* device track length */
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__u8 DS4DEVI; /* non-last keyed record overhead */
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__u8 DS4DEVL; /* last keyed record overhead */
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__u8 DS4DEVK; /* non-keyed record overhead differential */
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__u8 DS4DEVFG; /* flag byte */
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__u16 DS4DEVTL; /* device tolerance */
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__u8 DS4DEVDT; /* number of DSCB's per track */
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__u8 DS4DEVDB; /* number of directory blocks per track */
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} __attribute__ ((packed));
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struct vtoc_format1_label
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{
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char DS1DSNAM[44]; /* data set name */
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__u8 DS1FMTID; /* format identifier */
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char DS1DSSN[6]; /* data set serial number */
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__u16 DS1VOLSQ; /* volume sequence number */
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struct vtoc_labeldate DS1CREDT; /* creation date: ydd */
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struct vtoc_labeldate DS1EXPDT; /* expiration date */
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__u8 DS1NOEPV; /* number of extents on volume */
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__u8 DS1NOBDB; /* no. of bytes used in last direction blk */
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__u8 DS1FLAG1; /* flag 1 */
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char DS1SYSCD[13]; /* system code */
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struct vtoc_labeldate DS1REFD; /* date last referenced */
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__u8 DS1SMSFG; /* system managed storage indicators */
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__u8 DS1SCXTF; /* sec. space extension flag byte */
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__u16 DS1SCXTV; /* secondary space extension value */
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__u8 DS1DSRG1; /* data set organisation byte 1 */
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__u8 DS1DSRG2; /* data set organisation byte 2 */
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__u8 DS1RECFM; /* record format */
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__u8 DS1OPTCD; /* option code */
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__u16 DS1BLKL; /* block length */
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__u16 DS1LRECL; /* record length */
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__u8 DS1KEYL; /* key length */
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__u16 DS1RKP; /* relative key position */
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__u8 DS1DSIND; /* data set indicators */
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__u8 DS1SCAL1; /* secondary allocation flag byte */
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char DS1SCAL3[3]; /* secondary allocation quantity */
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struct vtoc_ttr DS1LSTAR; /* last used track and block on track */
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__u16 DS1TRBAL; /* space remaining on last used track */
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__u16 res1; /* reserved */
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struct vtoc_extent DS1EXT1; /* first extent description */
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struct vtoc_extent DS1EXT2; /* second extent description */
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struct vtoc_extent DS1EXT3; /* third extent description */
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struct vtoc_cchhb DS1PTRDS; /* possible pointer to f2 or f3 DSCB */
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} __attribute__ ((packed));
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struct vtoc_format4_label
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{
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char DS4KEYCD[44]; /* key code for VTOC labels: 44 times 0x04 */
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__u8 DS4IDFMT; /* format identifier */
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struct vtoc_cchhb DS4HPCHR; /* highest address of a format 1 DSCB */
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__u16 DS4DSREC; /* number of available DSCB's */
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struct vtoc_cchh DS4HCCHH; /* CCHH of next available alternate track */
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__u16 DS4NOATK; /* number of remaining alternate tracks */
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__u8 DS4VTOCI; /* VTOC indicators */
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__u8 DS4NOEXT; /* number of extents in VTOC */
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__u8 DS4SMSFG; /* system managed storage indicators */
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__u8 DS4DEVAC; /* number of alternate cylinders.
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* Subtract from first two bytes of
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* DS4DEVSZ to get number of usable
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* cylinders. can be zero. valid
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* only if DS4DEVAV on. */
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struct vtoc_dev_const DS4DEVCT; /* device constants */
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char DS4AMTIM[8]; /* VSAM time stamp */
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char DS4AMCAT[3]; /* VSAM catalog indicator */
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char DS4R2TIM[8]; /* VSAM volume/catalog match time stamp */
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char res1[5]; /* reserved */
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char DS4F6PTR[5]; /* pointer to first format 6 DSCB */
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struct vtoc_extent DS4VTOCE; /* VTOC extent description */
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char res2[10]; /* reserved */
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__u8 DS4EFLVL; /* extended free-space management level */
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struct vtoc_cchhb DS4EFPTR; /* pointer to extended free-space info */
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char res3; /* reserved */
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__u32 DS4DCYL; /* number of logical cyls */
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char res4[2]; /* reserved */
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__u8 DS4DEVF2; /* device flags */
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char res5; /* reserved */
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} __attribute__ ((packed));
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struct vtoc_ds5ext
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{
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__u16 t; /* RTA of the first track of free extent */
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__u16 fc; /* number of whole cylinders in free ext. */
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__u8 ft; /* number of remaining free tracks */
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} __attribute__ ((packed));
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struct vtoc_format5_label
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{
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char DS5KEYID[4]; /* key identifier */
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struct vtoc_ds5ext DS5AVEXT; /* first available (free-space) extent. */
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struct vtoc_ds5ext DS5EXTAV[7]; /* seven available extents */
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__u8 DS5FMTID; /* format identifier */
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struct vtoc_ds5ext DS5MAVET[18]; /* eighteen available extents */
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struct vtoc_cchhb DS5PTRDS; /* pointer to next format5 DSCB */
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} __attribute__ ((packed));
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struct vtoc_ds7ext
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{
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__u32 a; /* starting RTA value */
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__u32 b; /* ending RTA value + 1 */
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} __attribute__ ((packed));
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struct vtoc_format7_label
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{
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char DS7KEYID[4]; /* key identifier */
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struct vtoc_ds7ext DS7EXTNT[5]; /* space for 5 extent descriptions */
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__u8 DS7FMTID; /* format identifier */
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struct vtoc_ds7ext DS7ADEXT[11]; /* space for 11 extent descriptions */
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char res1[2]; /* reserved */
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struct vtoc_cchhb DS7PTRDS; /* pointer to next FMT7 DSCB */
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} __attribute__ ((packed));
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struct vtoc_cms_label {
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__u8 label_id[4]; /* Label identifier */
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__u8 vol_id[6]; /* Volid */
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__u16 version_id; /* Version identifier */
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__u32 block_size; /* Disk block size */
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__u32 origin_ptr; /* Disk origin pointer */
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__u32 usable_count; /* Number of usable cylinders/blocks */
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__u32 formatted_count; /* Maximum number of formatted cylinders/
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* blocks */
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__u32 block_count; /* Disk size in CMS blocks */
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__u32 used_count; /* Number of CMS blocks in use */
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__u32 fst_size; /* File Status Table (FST) size */
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__u32 fst_count; /* Number of FSTs per CMS block */
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__u8 format_date[6]; /* Disk FORMAT date */
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__u8 reserved1[2];
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__u32 disk_offset; /* Disk offset when reserved*/
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__u32 map_block; /* Allocation Map Block with next hole */
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__u32 hblk_disp; /* Displacement into HBLK data of next hole */
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__u32 user_disp; /* Displacement into user part of Allocation
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* map */
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__u8 reserved2[4];
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__u8 segment_name[8]; /* Name of shared segment */
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} __attribute__ ((packed));
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#endif /* _ASM_S390_VTOC_H */
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