On Fri, Sep 09, 2011 at 12:00:47PM +0100, Mel Gorman wrote:

Currently swapfiles are managed entirely by the core VM by using
->bmap to allocate space and write to the blocks directly. This
patch adds address_space_operations methods that allow a filesystem
to optionally control the swapfile.

  int swap_activate(struct file *);
  int swap_deactivate(struct file *);
  int swap_writepage(struct file *, struct page *, struct writeback_control *);
  int swap_readpage(struct file *, struct page *);

Just as the last two dozen times this came up:

NAK

The right fix is to add a filesystem method to support direct-I/O on
arbitrary kernel pages, instead of letting the wap abstraction leak into
the filesystem.
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