FSDMGR_CachedWrite (Compact 2013)
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
- dwCacheId
[in] Cache ID value returned by the FSDMGR_CreateCache function.
- 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 |