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The following table shows the Cache Manager functions.
| Programming element | Description |
|---|---|
| CachedRead | If the specified block is cached, this function copies data from the cache into a buffer.
If the specified block is not cached, this function reads the data from the disk and copies it into a buffer along with the cache. |
| CachedWrite | This function, in the case of a write-through cache, writes data to the disk and the cache.
In the case of 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. |
| CacheIoControl | This function sends a custom IOCTL to the cache. |
| CreateCache | This function creates a cache. |
| DeleteCache | This function deletes a cache.
This frees all memory allocated to the cache. |
| FlushCache | This function commits dirty blocks in the cache to the disk.
This is only necessary for a write-back cache. |
| InvalidateCache | This function invalidates the cached sectors in a sector list.
Invalidated sectors are not committed to disk first, even if they are dirty. |
| ResizeCache | This function resizes a cache by reducing or expanding its size. |
| SyncCache | This function updates the cache by reading from the disk for each cache block while maintaining the mapping between a cache block and a disk block. |
See Also
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