mirror of http://192.168.1.51:8099/lmh188/twain3.0
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*=============================================================================
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Copyright (c) 1998 Microsoft Corporation
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Module Name:
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clfslsn.h
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Abstract:
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Header file containing the private definition for the common log
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file system's log sequence number structure.
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Author:
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Dexter Bradshaw [DexterB] 09-Dec-1998
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Revision History:
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=============================================================================*/
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#ifndef _CLFS_LSN_H_
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#define _CLFS_LSN_H_
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#if (NTDDI_VERSION >= NTDDI_WS03SP1) || (_WIN32_WINNT >= _WIN32_WINNT_WS03)
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//
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// CLFS_RECORD_INDEX
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//
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// Log record offset on container file. The log record offset consists of a block
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// offset in the container and a bucket identifier indexing the records in the block.
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// Declared up here because including clfs_x.h will try to define the LSN, which needs
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// this.
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//
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typedef UINT32 CLFS_RECORD_INDEX;
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#endif /* NTDDI_VERSION || _WIN32_WINNT */
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#if (NTDDI_VERSION >= NTDDI_WS03SP1) || (_WIN32_WINNT >= _WIN32_WINNT_WS03)
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//
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// CLS_LSN
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//
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// The log sequence number (LSN) is a valid log file address. The LSN consists of
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// three (3) parts: (a) a log identifier to identify which physical log the log record
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// belongs to, (b) a container index identifying the log container where the log record
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// lies, and (c) a record offset identified by the offset of the block in the container
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// and an ordinal number for the record within the container.
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//
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//
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// The structure of the LSN poses some inherent limitations of the number of logs,
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// the number of containers, the size of a container, and the number of log records in
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// a log block.
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//
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// Maximum number of physical log files is 64K.
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// Maximum number of container identifiers is 4G.
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// Maximum size of a container is 4G.
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// Maximum number of sector-aligned log blocks is 8M
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// Maximum number of record buckets in a log block is 512
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//
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typedef union _CLS_LSN
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{
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//
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// Container identifier
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//
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struct
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{
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CLFS_RECORD_INDEX idxRecord; // Record offset on container.
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CLFS_CONTAINER_ID cidContainer; // Container identifier.
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} offset;
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__volatile ULONGLONG ullOffset; // Sequence number within physical log.
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} CLS_LSN, *PCLS_LSN, **PPCLS_LSN;
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//
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// Alias CLS prefixed types with CLFS prefixes.
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//
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typedef CLS_LSN CLFS_LSN;
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typedef CLFS_LSN *PCLFS_LSN, **PPCLFS_LSN;
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#endif /* NTDDI_VERSION || _WIN32_WINNT */
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#endif
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