[PATCH 06/14] 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). This is used by CacheFiles to store the contents of netfs pages into their backing file pages. Supply a generic implementation for

[PATCH 06/14] 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). This is used by CacheFiles to store the contents of netfs pages into their backing file pages. Supply a generic implementation for