155 lines
3 KiB
C
155 lines
3 KiB
C
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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crs.h
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Abstract:
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Consistency replica set data structures and API
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Author:
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Ahmed Mohamed (ahmedm) 1-Feb-2000
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Revision History:
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--*/
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#ifndef _CRS_DEF
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#define _CRS_DEF
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#include <windows.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define CRS_VERSION 1
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#define CRS_TAG ( (CRS_VERSION << 24) | ('crs'))
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// sizes must be power of 2
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#define CRS_RECORD_SZ 64
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#define CRS_SECTOR_SZ 512
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#define CRS_RECORDS_PER_SECTOR (CRS_SECTOR_SZ / CRS_RECORD_SZ)
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#define CRS_SECTOR_MASK (CRS_RECORDS_PER_SECTOR - 1)
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#define CRS_MAX_GROUP_SZ 16
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#define CRS_QUORUM(sz, total) ((sz == total) || (sz > total/2) || ((DWORD)sz > CrsForcedQuorumSize)? 1: 0)
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#define CRS_PREPARE 0x1
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#define CRS_COMMIT 0x2
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#define CRS_ABORT 0x4
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#define CRS_EPOCH 0x8
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#define CRS_DUBIOUS 0x10
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typedef ULONGLONG crs_id_t[2];
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typedef ULONGLONG crs_epoch_t;
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typedef ULONGLONG crs_seq_t;
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typedef struct {
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crs_epoch_t epoch;
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crs_seq_t seq;
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UINT state;
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UINT tag;
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}CrsHdr_t;
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typedef struct {
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CrsHdr_t hdr;
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char data[CRS_RECORD_SZ - sizeof(CrsHdr_t)];
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}CrsRecord_t;
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typedef NTSTATUS (WINAPI *crs_callback_t)(PVOID hd, int nid,
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CrsRecord_t *singlerec,
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int action, int mid);
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#define CRS_STATE_INIT 0
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#define CRS_STATE_RECOVERY 1
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#define CRS_STATE_READ 2
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#define CRS_STATE_WRITE 3
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typedef struct {
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CRITICAL_SECTION lock;
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// log file handle
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HANDLE fh;
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crs_epoch_t epoch; // current epoch
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crs_seq_t seq; // current sequence
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CrsRecord_t *buf; // current sector
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int last_record; // last record in this sector
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int max_records; // max number of records in update file
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USHORT refcnt;
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USHORT leader_id;
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USHORT lid;
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USHORT state; // write, read, recovery, init
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BOOLEAN pending;
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// client call back routine
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crs_callback_t callback;
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PVOID callback_arg;
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}CrsInfo_t;
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typedef struct _CrsRecoveryBlk_t {
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CrsInfo_t *info, *minfo;
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int nid, mid;
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}CrsRecoveryBlk_t;
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#if defined(QFS_DBG)
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extern void WINAPI debug_log(char *, ...);
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#define CrsLog(_x_) debug_log _x_
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#else
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#define CrsLog(_x_)
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#endif
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#define CRS_ACTION_REPLAY 0x0 // apply record on specified node
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#define CRS_ACTION_UNDO 0x1 // undo update record
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#define CRS_ACTION_COPY 0x2 // copy one replica to other
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#define CRS_ACTION_QUERY 0x3 // ask about outcome of specified record
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#define CRS_ACTION_DONE 0x4 // signal send of recovery
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extern DWORD CrsForcedQuorumSize;
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void
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WINAPI
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CrsSetForcedQuorumSize(DWORD size);
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DWORD
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WINAPI
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CrsOpen(crs_callback_t callback, PVOID callback_arg, USHORT lid,
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WCHAR *log_name, int max_logsectors, HANDLE *hdl);
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void
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WINAPI
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CrsClose(PVOID hd);
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void
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WINAPI
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CrsFlush(PVOID hd);
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DWORD
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WINAPI
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CrsStart(PVOID hd[], ULONG aset, int cluster_sz,
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ULONG *wset, ULONG *rset, ULONG *fset);
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PVOID
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WINAPI
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CrsPrepareRecord(PVOID hd, PVOID lrec, crs_id_t id);
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int
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WINAPI
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CrsCommitOrAbort(PVOID hd, PVOID lrec, int commit);
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int
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WINAPI
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CrsCanWrite(PVOID hd);
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#endif
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