Share via

FSDMGR_CachedWrite (Compact 2013)

  • Article

3/26/2014

For a write-through cache, this function writes data to disk and to the cache.

For a write-back cache, this function writes data only to the cache and allows the lazy-writer thread to commit the data to the disk.

It is called by File System Disk Manager (FSDMGR) for disk cache.

Syntax

DWORD  FSDMGR_CachedWrite(
  DWORD dwCacheId,
  DWORD dwBlockNum,
  DWORD dwNumBlocks,
  PVOID pBuffer,
  DWORD dwWriteFlags
);

Parameters

  • dwBlockNum
    [in] Starting block to which to write.
  • dwNumBlocks
    [in] Number of blocks to write.
  • pBuffer
    [in] Pointer to the buffer containing data to write.

  • dwWriteFlags
    [in] This value can be set to CACHE_FORCE_WRITETHROUGH to force the written blocks to be committed to the disk.

    This applies only to a write-back cache.

Return Value

ERROR_SUCCESS indicates success. A Microsoft Win32 error code indicates failure.

Remarks

If the cache location to which the data is to be written overwrites a dirty block that is different from the block to be written, that dirty block is committed to the disk.

Requirements

Header

fsdmgr.h

Library

Fsdmgr.lib

See Also

Reference

FSDMGR Functions
FSD Functions