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CLS_INFORMATION structure (clfs.h)

  • Article

Describes general information about a log. The GetLogFileInformation function returns the CLFS_INFORMATION structure.

Syntax

typedef struct _CLS_INFORMATION {
  LONGLONG  TotalAvailable;
  LONGLONG  CurrentAvailable;
  LONGLONG  TotalReservation;
  ULONGLONG BaseFileSize;
  ULONGLONG ContainerSize;
  ULONG     TotalContainers;
  ULONG     FreeContainers;
  ULONG     TotalClients;
  ULONG     Attributes;
  ULONG     FlushThreshold;
  ULONG     SectorSize;
  CLS_LSN   MinArchiveTailLsn;
  CLS_LSN   BaseLsn;
  CLS_LSN   LastFlushedLsn;
  CLS_LSN   LastLsn;
  CLS_LSN   RestartLsn;
  GUID      Identity;
} CLS_INFORMATION, *PCLS_INFORMATION, *PPCLS_INFORMATION;

Members

TotalAvailable

The total available space that is allocated to a log, in bytes.

This member is the sum of the sizes of all containers that are allocated to the dedicated log.

CurrentAvailable

The space that is available in a log to append new records and reservation allocations, in bytes.

TotalReservation

The total space in a log that is dedicated to reservation allocations.

BaseFileSize

The size of the base log, in bytes.

ContainerSize

The size of a container, in bytes.

TotalContainers

The number of active containers that are associated with a dedicated log.

FreeContainers

The number of containers that are not in an active log.

TotalClients

The number of log streams that are active in a physical log.

Attributes

The log attributes that are set by using the fFlagsAndAttributes parameter of CreateLogFile when a log is created.

FlushThreshold

The number of bytes of data that can remain pending on the internal flush queue before the Common Log File System (CLFS) automatically writes the data to disk.

SectorSize

The sector size of the underlying disk geometry, in bytes.

The sector size is assumed to be a multiple of 512 and consistent across log containers.

MinArchiveTailLsn

The log sequence number (LSN) of the log archive tail.

BaseLsn

The LSN that marks the start of the active region of a log.

LastFlushedLsn

The value of LastFlushedLsn indicates that any LSNs smaller than the one specified are already flushed to disk.

LastLsn

The value of LastLsn indicates that any LSNs smaller than the one specified are already appended to the log.

RestartLsn

The LSN of the last written restart record.

If the log does not have a restart area, the LSN has the value of CLFS_LSN_INVALID.

Identity

The unique identifier for a log.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2003 R2 [desktop apps only]
Header clfs.h (include Clfsw32.h)

See also

GetLogFileInformation