Re: [PATCH 04/12] mm: Add support for a filesystem to activate swapfiles and use direct_IO for writing swap pages

[Rik van Riel]

On 06/20/2012 05:37 AM, 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 effectively
> ensures that the underlying blocks are allocated and avoids the need
> for the swap subsystem to locate what physical blocks store offsets
> within a file.
>
> If the swap subsystem is to use the filesystem information to locate
> the blocks, it is critical that information such as block groups,
> block bitmaps and the block descriptor table that map the swap file
> were resident in memory. This patch adds address_space_operations that
> the VM can call when activating or deactivating swap backed by a file.
>
>    int swap_activate(struct file *);
>    int swap_deactivate(struct file *);

Acked-by: Rik van Riel<riel@xxxxxxxxxx>

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