[PATCH 19/27] CacheFiles: Add a hook to write a single page of data to an inode [try #2]

Add an address space operation to write one single page of data to an inode at a page-aligned location (thus permitting the implementation to be highly optimised). The data source is a single page. This is used by CacheFiles to store the contents of netfs pages into their backing file pages. Sup

[PATCH 19/27] CacheFiles: Add a hook to write a single page of data to an inode

Add an address space operation to write one single page of data to an inode at a page-aligned location (thus permitting the implementation to be highly optimised). The data source is a single page. This is used by CacheFiles to store the contents of netfs pages into their backing file pages. Sup