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cckd.h
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/* CCKD.H (C) Copyright "Fish" (David B. Trout), 2018-2022 */
/* CCKD dasd struct and type definitions */
/* */
/* Released under "The Q Public License Version 1" */
/* (http://www.hercules-390.org/herclic.html) as modifications to */
/* Hercules. */
#ifndef _CCKD_H_
#define _CCKD_H_
/*-------------------------------------------------------------------*/
/* IMPORTANT PROGRAMMING NOTE: for whatever reason, base dasd */
/* image files use a L2_trkoff value of zero in their L1tab entry */
/* for non-existent tracks, whereas shadow files use a value of -1. */
/* To ensure we remain 100% compatible with all non-CCKD64 versions */
/* of Hercules, we MUST enforce this same inconsistent use design. */
/*-------------------------------------------------------------------*/
#define CCKD_NOSIZE ((U32)0)
#define CCKD_MAXSIZE ((U32)MAX_OFFSET_T)
#define CCKD_BASE_NO_OFFSET CCKD_NOSIZE
#define CCKD_SHADOW_NO_OFFSET CCKD_MAXSIZE
/*-------------------------------------------------------------------*/
/* struct typedefs */
/*-------------------------------------------------------------------*/
typedef struct CKD_DEVHDR CKD_DEVHDR; // Device header
typedef struct CKD_TRKHDR CKD_TRKHDR; // Track header
typedef struct FBA_BKGHDR FBA_BKGHDR; // Block Group header
typedef struct CKD_RECHDR CKD_RECHDR; // Record header
typedef struct CCKD_DEVHDR CCKD_DEVHDR; // Compress device header
typedef struct CCKD_L2ENT CCKD_L2ENT; // Level 2 table entry
typedef struct CCKD_FREEBLK CCKD_FREEBLK; // Free block
typedef struct CCKD_IFREEBLK CCKD_IFREEBLK; // Free block (internal)
typedef struct CCKD_RA CCKD_RA; // Readahead queue entry
typedef struct CCKDBLK CCKDBLK; // Global CCKD dasd block
typedef struct CCKD_EXT CCKD_EXT; // CCKD Extension block
typedef struct SPCTAB SPCTAB; // Space table
/*-------------------------------------------------------------------*/
/* Structure definitions for CKD headers */
/*-------------------------------------------------------------------*/
/* NOTE: The dh_heads, dh_trksize and dh_highcyl */
/* values are always kept in LITTLE endian format. */
/*-------------------------------------------------------------------*/
struct CKD_DEVHDR /* Device header */
{
BYTE dh_devid[8]; /* ASCII Device Header id;
see dasdblks.h for list */
FWORD dh_heads; /* CKD: heads per cylinder
CFBA: number of sectors */
FWORD dh_trksize; /* CKD: track size
CFBA: sector size */
BYTE dh_devtyp; /* Low byte of hex device type
(x80=3380, x90=3390, etc) */
BYTE dh_fileseq; /* CKD: image file sequence no.
(0=only file, 1=first file
of multiple files)
CFBA: 0 (not used) */
HWORD dh_highcyl; /* CKD: Highest cylinder number
on this file, or zero if this
is the last or only file.
CFBA: zero (not used) */
BYTE dh_serial[12]; /* Serial number (ASCII) */
BYTE resv[480]; /* Reserved */
};
struct CKD_TRKHDR { /* Track header */
BYTE bin; /* Bin number */
HWORD cyl; /* Cylinder number */
HWORD head; /* Head number */
};
struct FBA_BKGHDR { /* Block Group Header */
BYTE cmp; /* Compression byte */
FWORD grpnum; /* GROUP number */
};
struct CKD_RECHDR { /* Record header */
HWORD cyl; /* Cylinder number */
HWORD head; /* Head number */
BYTE rec; /* Record number */
BYTE klen; /* Key length */
HWORD dlen; /* Data length */
};
#define CKD_DEVHDR_SIZE ((ssize_t)sizeof(CKD_DEVHDR))
#define CKD_TRKHDR_SIZE ((ssize_t)sizeof(CKD_TRKHDR))
#define FBA_BKGHDR_SIZE ((ssize_t)sizeof(FBA_BKGHDR))
#define CKD_RECHDR_SIZE ((ssize_t)sizeof(CKD_RECHDR))
/* Null track formats */
#define CKD_NULLTRK_FMT0 0 /* ha r0 eof eot */
#define CKD_NULLTRK_FMT1 1 /* ha r0 eot */
#define CKD_NULLTRK_FMT2 2 /* linux (3390 only) */
#define CKD_NULLTRK_FMTMAX CKD_NULLTRK_FMT2
#define CKD_NULLTRK_SIZE0 (CKD_TRKHDR_SIZE + CKD_R0_SIZE + CKD_R0_DLEN + CKD_EOF_SIZE + CKD_ENDTRK_SIZE)
#define CKD_NULLTRK_SIZE1 (CKD_TRKHDR_SIZE + CKD_R0_SIZE + CKD_R0_DLEN + CKD_ENDTRK_SIZE)
#define CKD_NULLTRK_SIZE2 (CKD_TRKHDR_SIZE + CKD_R0_SIZE + CKD_R0_DLEN + (12 * (CKD_RECHDR_SIZE + CKD_NULL_FMT2_DLEN)) + CKD_ENDTRK_SIZE)
/*-------------------------------------------------------------------*/
/* Structure definitions for Compressed CCKD/CFBA devices */
/*-------------------------------------------------------------------*/
/* NOTE: The num_L1tab, num_L2tab, cyls, cdh_size, cdh_used, */
/* free_off, free_total, free_largest, free_num, free_imbed, */
/* and cmp_parm fields are kept in LITTLE endian format. */
/*-------------------------------------------------------------------*/
struct CCKD_DEVHDR /* Compress device header */
{
/* 0 */BYTE cdh_vrm[3]; /* Version Release Modifier */
/* 3 */BYTE cdh_opts; /* Options byte */
/* 4 */S32 num_L1tab; /* Number of L1tab entries */
/* 8 */S32 num_L2tab; /* Number of L2tab entries */
/* 12 */U32 cdh_size; /* File size */
/* 16 */U32 cdh_used; /* File used */
/* 20 */U32 free_off; /* Offset to free space */
/* 24 */U32 free_total; /* Total free space */
/* 28 */U32 free_largest; /* Largest free space */
/* 32 */S32 free_num; /* Number free spaces */
/* 36 */U32 free_imbed; /* Imbedded free space */
/* 40 */FWORD cdh_cyls; /* CCKD: Cylinders on device
CFBA: Sectors on device */
/* 44 */BYTE cdh_nullfmt; /* Null track format */
/* 45 */BYTE cmp_algo; /* Compression algorithm */
/* 46 */S16 cmp_parm; /* Compression parameter */
/* 48 */BYTE resv2[464]; /* Reserved */
};
#define CCKD_VERSION 0
#define CCKD_RELEASE 3
#define CCKD_MODLVL 1
#define CCKD_OPT_BIGEND 0x02 /* file in BIG endian format */
#define CCKD_OPT_SPERRS 0x20 /* Space errors detected */
#define CCKD_OPT_OPENRW 0x40 /* Opened R/W since last chkdsk */
#define CCKD_OPT_OPENED 0x80
#define CCKD_COMPRESS_NONE 0x00
#define CCKD_COMPRESS_ZLIB 0x01
#define CCKD_COMPRESS_BZIP2 0x02
#define CCKD_COMPRESS_MASK 0x03
#define CCKD_STRESS_MINLEN 4096
#if defined( HAVE_ZLIB )
#define CCKD_STRESS_COMP CCKD_COMPRESS_ZLIB
#else
#define CCKD_STRESS_COMP CCKD_COMPRESS_NONE
#endif
#define CCKD_STRESS_PARM1 4
#define CCKD_STRESS_PARM2 2
struct CCKD_L2ENT { /* Level 2 table entry */
/* NOTE: all fields are numeric and always in LITTLE endian format. */
U32 L2_trkoff; /* Offset to track image */
U16 L2_len; /* Track length */
U16 L2_size; /* Track size (size >= len) */
};
struct CCKD_FREEBLK { /* Free block (file) */
/* NOTE: all fields are numeric and always in LITTLE endian format. */
U32 fb_offnxt; /* Offset to NEXT free blk */
U32 fb_len; /* Length of THIS free blk */
};
#define fb_offset fb_offnxt // (see cckd_read_fsp/cckd_write_fsp!)
struct CCKD_IFREEBLK { /* Free block (internal) */
/* NOTE: because this control block is an INTERNAL control block */
/* which does not actually exist in the emulated dasd image file */
/* (i.e. it is only used internally), all of its fields are always */
/* in *HOST* endian format (little endian on little endian hosts */
/* and big endian on big endian hosts). */
U32 ifb_offnxt; /* Offset to NEXT free blk */
U32 ifb_len; /* Length of THIS free blk */
int ifb_idxprv; /* Index to prev free blk */
int ifb_idxnxt; /* Index to next free blk */
int ifb_pending; /* 1=Free pending (don't use)*/
};
struct CCKD_RA { /* Readahead queue entry */
DEVBLK *ra_dev; /* Readahead device */
int ra_trk; /* Readahead track */
int ra_idxprv; /* Index to prev entry */
int ra_idxnxt; /* Index to next entry */
};
typedef U32 CCKD_L1ENT; /* Level 1 table entry */
typedef CCKD_L1ENT CCKD_L1TAB[]; /* Level 1 table */
typedef CCKD_L2ENT CCKD_L2TAB[256]; /* Level 2 table */
typedef char CCKD_ITRACE[256]; /* Trace table entry */
#define CCKD_DEVHDR_SIZE ((ssize_t)sizeof(CCKD_DEVHDR))
#define CCKD_L1ENT_SIZE ((ssize_t)sizeof(CCKD_L1ENT))
#define CCKD_L2ENT_SIZE ((ssize_t)sizeof(CCKD_L2ENT))
#define CCKD_L2TAB_SIZE ((ssize_t)sizeof(CCKD_L2TAB))
#define CCKD_FREEBLK_SIZE ((ssize_t)sizeof(CCKD_FREEBLK))
#define CCKD_IFREEBLK_SIZE ((ssize_t)sizeof(CCKD_IFREEBLK))
#define CCKD_DEVHDR_POS (CKD_DEVHDR_SIZE)
#define CCKD_L1TAB_POS ((CCKD_DEVHDR_POS)+(CCKD_DEVHDR_SIZE))
/* Flag bits */
#define CCKD_SIZE_EXACT 0x01 /* Space obtained is exact */
#define CCKD_SIZE_ANY 0x02 /* Space can be any size */
#define CCKD_L2SPACE 0x04 /* Space for a l2 table */
/* Adjustable values */
#define CCKD_IFB_ENTS_INCR 1024 /* ifb entries per (re)alloc */
#define CCKD_FREE_MIN_SIZE 96 /* Minimum free space size */
#define CCKD_FREE_MIN_INCR 32 /* Added for each ifb incr */
#define CCKD_COMPRESS_MIN 512 /* Track images smaller than
this won't be compressed */
#define CCKD_MAX_SF 8 /* Maximum number of shadow
files: 0 to 9 [0 disables
shadow file support] */
#define CCKD_MIN_READAHEADS 0 /* Min readahead trks */
#define CCKD_DEF_READAHEADS 2 /* Def readahead trks */
#define CCKD_MAX_READAHEADS 16 /* Max readahead trks */
#define CCKD_DEF_RA_SIZE 4 /* Readahead queue size */
#define CCKD_MAX_RA_SIZE 16 /* Readahead queue size */
#define CCKD_MIN_RA 0 /* Min readahead threads */
#define CCKD_DEF_RA 2 /* Def readahead threads */
#define CCKD_MAX_RA 9 /* Max readahead threads */
#define CCKD_MIN_WRITER 1 /* Min writer threads */
#define CCKD_DEF_WRITER 2 /* Def writer threads */
#define CCKD_MAX_WRITER 9 /* Max writer threads */
#define CCKD_MIN_GCOL 0 /* Min garbage collectors */
#define CCKD_DEF_GCOL 1 /* Def garbage collectors */
#define CCKD_MAX_GCOL 1 /* Max garbage collectors */
#define CCKD_MIN_GCINT 0 /* Min collection interval */
#define CCKD_DEF_GCINT 0 /* Def collection interval */
#define CCKD_MAX_GCINT 60 /* Max collection interval */
#define CCKD_MIN_GCPARM -8 /* Min gcol adjustment parm */
#define CCKD_DEF_GCPARM 0 /* Def gcol adjustment parm */
#define CCKD_MAX_GCPARM +8 /* max gcol adjustment parm */
#define CCKD_DEF_NUM_TRACE 64 /* Def nbr of trace entries */
#define CCKD_MAX_NUM_TRACE 262144 /* Max nbr of trace entries */
#define CCKD_DEF_FREEPEND -1 /* Def free pending cycles */
#define CCKD_MAX_FREEPEND 4 /* Max free pending cycles */
#define CCKD_MIN_DHMAX 0 /* Min DASD hardeners allowed */
#define CCKD_DEF_DHMAX 1 /* Def DASD hardeners allowed */
#define CCKD_MAX_DHMAX 1 /* Max DASD hardeners allowed */
/* *** ONLY ONE ALLOWED! *** */
#define CCKD_MIN_DHINT 0 /* Min DASD hardening interval */
#define CCKD_DEF_DHINT 0 /* Def DASD hardening interval */
#define CCKD_MAX_DHINT 999 /* Max DASD hardening interval */
/*-------------------------------------------------------------------*/
/* Global CCKD dasd block */
/*-------------------------------------------------------------------*/
struct CCKDBLK { /* Global cckd dasd block */
BYTE id[8]; /* "CCKDBLK " */
#define CCKDBLK_ID "CCKDBLK " /* "CCKDBLK " */
DEVBLK *dev1st; /* 1st device in cckd queue */
unsigned int batch:1, /* 1=called in batch mode */
debug:1, /* 1=CCW trace debug msgs */
dtax:1, /* 1=Dump Table At Exit */
sfmerge:1, /* 1=sf-* merge */
sfforce:1, /* 1=sf-* force */
termwr:1; /* 1=terminate wr threads */
int sflevel; /* sfk xxxx level */
int batchml; /* message level for batch ops */
BYTE comps; /* Supported compressions */
BYTE comp; /* Override compression */
int compparm; /* Override compression parm */
LOCK dhlock; /* Dasd Hardener lock */
COND dhcond; /* Dasd Hardener cond */
int dhs; /* Number Dasd Hardener threads started */
int dha; /* Number Dasd Hardener threads active */
int dhmax; /* Max Dasd Hardeners */
int dhint; /* Wait time in seconds */
LOCK gclock; /* Garbage collector lock */
COND gccond; /* Garbage collector cond */
int gcs; /* Number garbage collector threads started */
int gca; /* Number garbage collector threads active */
int gcmax; /* Max garbage collectors */
int gcint; /* Wait time in seconds */
int gcparm; /* Adjustment parm */
LOCK wrlock; /* I/O lock */
COND wrcond; /* I/O condition */
int wrpending; /* Number writes pending */
int wrwaiting; /* Number writers waiting */
int wrs; /* Number writer threads started */
int wra; /* Number writer threads active */
int wrmax; /* Max writer threads */
int wrprio; /* Writer thread priority */
LOCK ralock; /* Readahead lock */
COND racond; /* Readahead condition */
int ras; /* Number readahead threads started */
int raa; /* Number readadead threads active */
int ramax; /* Max readahead threads */
int rawaiting; /* Number threads waiting */
int ranbr; /* Readahead queue size */
int readaheads; /* Nbr tracks to read ahead */
CCKD_RA ra[CCKD_MAX_RA_SIZE]; /* Readahead queue */
int ra1st; /* First readahead entry */
int ralast; /* Last readahead entry */
int rafree; /* Free readahead entry */
LOCK devlock; /* Device chain lock */
COND devcond; /* Device chain condition */
int devusers; /* Number shared users */
int devwaiters; /* Number of waiters */
int freepend; /* Number freepend cycles */
int gcmsgs; /* Garbage collector msgs */
int nosfd; /* 1=No stats rpt at close */
int nostress; /* 1=No stress writes */
int linuxnull; /* 1=Always check nulltrk */
int fsync; /* 1=Perform fsync() */
COND termcond; /* Termination condition */
U64 stats_switches; /* Switches */
U64 stats_cachehits; /* Cache hits */
U64 stats_cachemisses; /* Cache misses */
U64 stats_readaheads; /* Readaheads */
U64 stats_readaheadmisses;/* Readahead misses */
U64 stats_iowaits; /* Waits for i/o */
U64 stats_cachewaits; /* Waits for cache */
U64 stats_stresswrites; /* Writes under stress*/
U64 stats_l2cachehits; /* L2 cache hits */
U64 stats_l2cachemisses; /* L2 cache misses */
U64 stats_l2reads; /* L2 reads */
U64 stats_reads; /* Number reads */
U64 stats_readbytes; /* Bytes read */
U64 stats_writes; /* Number writes */
U64 stats_writebytes; /* Bytes written */
U64 stats_gcolmoves; /* Spaces moved */
U64 stats_gcolbytes; /* Bytes moved */
U64 stats_dhpasses; /* DASD harden passes */
U64 stats_hardens; /* DASD harden opers */
U64 stats_fsyncs; /* DASD sync opers */
LOCK trclock; /* Internal trace table lock */
CCKD_ITRACE *itrace; /* Internal trace table */
CCKD_ITRACE *itracep; /* Current pointer */
CCKD_ITRACE *itracex; /* End of trace table */
int itracen; /* Table size in #of entries */
int itracec; /* How many entries are used */
int bytemsgs; /* Limit for `byte 0' msgs */
};
#define OBTAIN_TRACE_LOCK() obtain_lock( &cckdblk.trclock )
#define RELEASE_TRACE_LOCK() release_lock( &cckdblk.trclock )
#define CCKD_TRACE( fmt, ... ) \
cckd_trace( __FUNCTION__, __LINE__, dev, fmt, ## __VA_ARGS__ )
/*-------------------------------------------------------------------*/
/* CCKD Extension Block */
/*-------------------------------------------------------------------*/
struct CCKD_EXT { /* Ext for compressed ckd */
DEVBLK *devnext; /* cckd device queue */
unsigned int ckddasd:1, /* 1=CKD dasd */
fbadasd:1, /* 1=FBA dasd */
cckdioact:1, /* 1=Channel program active */
bufused:1, /* 1=newbuf was used */
updated:1, /* 1=Update occurred */
merging:1, /* 1=File merge in progress */
stopping:1, /* 1=Device is closing */
notnull:1, /* 1=Device has track images */
L2ok:1, /* 1=All l2s below bounds */
sfmerge:1, /* 1=sf-xxxx merge */
sfforce:1, /* 1=sf-xxxx force */
needsdh:1; /* 1=written since last harden */
int sflevel; /* sfk xxxx level */
LOCK filelock; /* File lock */
LOCK cckdiolock; /* I/O lock */
COND cckdiocond; /* I/O condition */
U64 cckd_maxsize; /* Maximum file size */
int cckdwaiters; /* Number I/O waiters */
int wrpending; /* Number writes pending */
int ras; /* Number readaheads active */
int sfn; /* Number active shadow files*/
int sfx; /* Active level 2 file index */
int L1idx; /* Active level 2 table index*/
CCKD_L2ENT *L2tab; /* Active level 2 table */
int L2_active; /* Active level 2 cache entry*/
U64 L2_bounds; /* L2 tables boundary */
int active; /* Active cache entry */
BYTE *newbuf; /* Uncompressed buffer */
CCKD_IFREEBLK *ifb; /* Internal free space chain */
int free_count; /* Number of entries in chain*/
int free_idx1st; /* Index of 1st entry */
int free_idxlast; /* Index of last entry */
int free_idxavail; /* Index of available entry */
unsigned int free_minsize; /* Minimum free space size */
int lastsync; /* Time of last sync */
int ralkup[CCKD_MAX_RA_SIZE];/* Lookup table */
int ratrk; /* Track to readahead */
unsigned int totreads; /* Total nbr trk reads */
unsigned int totwrites; /* Total nbr trk writes */
unsigned int totl2reads; /* Total nbr l2 reads */
unsigned int cachehits; /* Cache hits */
unsigned int readaheads; /* Number trks read ahead */
unsigned int switches; /* Number trk switches */
unsigned int misses; /* Number readahead misses */
int fd[CCKD_MAX_SF+1]; /* File descriptors */
BYTE swapend[CCKD_MAX_SF+1]; /* Swap endian flag */
BYTE open[CCKD_MAX_SF+1]; /* Open flag */
int reads[CCKD_MAX_SF+1]; /* Nbr track reads */
int L2_reads[CCKD_MAX_SF+1];/* Nbr l2 reads */
int writes[CCKD_MAX_SF+1]; /* Nbr track writes */
CCKD_L1ENT *L1tab[CCKD_MAX_SF+1]; /* Level 1 tables */
CCKD_DEVHDR cdevhdr[CCKD_MAX_SF+1]; /* cckd device hdr */
};
#define CCKD_MIN_FREESIZE( free_count ) (CCKD_FREE_MIN_SIZE + \
free_count < CCKD_IFB_ENTS_INCR ? 0 : \
(free_count / CCKD_IFB_ENTS_INCR) * CCKD_FREE_MIN_INCR)
#define CCKD_OPEN_NONE 0
#define CCKD_OPEN_RO 1
#define CCKD_OPEN_RD 2
#define CCKD_OPEN_RW 3
/*-------------------------------------------------------------------*/
/* Space table */
/*-------------------------------------------------------------------*/
struct SPCTAB
{
BYTE spc_typ; /* Type of space */
int spc_val; /* Value for space */
int spc_val2; /* Another value for space */
U32 spc_off; /* Space offset */
U32 spc_len; /* Space length */
U32 spc_siz; /* Space size */
};
#define SPCTAB_NONE 0 /* Ignore this space entry */
#define SPCTAB_DEVHDR 1 /* Space is device header */
#define SPCTAB_CDEVHDR 2 /* Space is compressed hdr */
#define SPCTAB_L1 3 /* Space is level 1 table */
#define SPCTAB_L2 4 /* Space is level 2 table */
#define SPCTAB_TRK 5 /* Space is track image */
#define SPCTAB_BLKGRP 6 /* Space is blkgrp image */
#define SPCTAB_FREE 7 /* Space is free block */
#define SPCTAB_EOF 8 /* Space is end-of-file */
#define SPCTAB_L2LOWER 9 /* Space is L2 lower bound */
#define SPCTAB_L2UPPER 10 /* Space is L2 upper bound */
#define SPCTAB_DATA 11 /* Space is track/block data */
#define SPCTAB_UNKNOWN 12 /* Unknown space */
/*-------------------------------------------------------------------*/
/* Definitions for sense data format codes and message codes */
/*-------------------------------------------------------------------*/
#define FORMAT_0 0 /* Program or System Checks */
#define FORMAT_1 1 /* Device Equipment Checks */
#define FORMAT_2 2 /* 3990 Equipment Checks */
#define FORMAT_3 3 /* 3990 Control Checks */
#define FORMAT_4 4 /* Data Checks */
#define FORMAT_5 5 /* Data Check + Displacement */
#define FORMAT_6 6 /* Usage Stats/Overrun Errors*/
#define FORMAT_7 7 /* Device Control Checks */
#define FORMAT_8 8 /* Device Equipment Checks */
#define FORMAT_9 9 /* Device Rd/Wrt/Seek Checks */
#define FORMAT_F 15 /* Cache Storage Checks */
#define MESSAGE_0 0 /* Message 0 */
#define MESSAGE_1 1 /* Message 1 */
#define MESSAGE_2 2 /* Message 2 */
#define MESSAGE_3 3 /* Message 3 */
#define MESSAGE_4 4 /* Message 4 */
#define MESSAGE_5 5 /* Message 5 */
#define MESSAGE_6 6 /* Message 6 */
#define MESSAGE_7 7 /* Message 7 */
#define MESSAGE_8 8 /* Message 8 */
#define MESSAGE_9 9 /* Message 9 */
#define MESSAGE_A 10 /* Message A */
#define MESSAGE_B 11 /* Message B */
#define MESSAGE_C 12 /* Message C */
#define MESSAGE_D 13 /* Message D */
#define MESSAGE_E 14 /* Message E */
#define MESSAGE_F 15 /* Message F */
/*-------------------------------------------------------------------*/
/* CCKD64 structs and definitions */
/*-------------------------------------------------------------------*/
#include "cckd64.h" /* 64-bit CCKD64 structs/constants */
#endif // _CCKD_H_