----- Original Message -----
> Add infrastructure for multipage buffered writes. This is implemented
> using an main iterator that applies an actor function to a range that
> can be written.
>
> This infrastucture is used to implement a buffered write helper, one
> to zero file ranges and one to implement the ->page_mkwrite VM
> operations. All of them borrow a fair amount of code from fs/buffers.
> for now by using an internal version of __block_write_begin that
> gets passed an iomap and builds the corresponding buffer head.
>
> The file system is gets a set of paired ->iomap_begin and ->iomap_end
> calls which allow it to map/reserve a range and get a notification
> once the write code is finished with it.
>
> Based on earlier code from Dave Chinner.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
> + /*
> + * For unwritten regions, we always need to ensure that
> + * sub-block writes cause the regions in the block we are not
> + * writing to are zeroed. Set the buffer as new to ensre this.
Minor typo: s/ensre/ensure/ above.
Reviewed-off-by: Bob Peterson <rpeterso@xxxxxxxxxx>
|