Re: [PATCH] fix readahead pipeline break caused by block plug

[Christoph Hellwig]

On Tue, Jan 31, 2012 at 06:34:16PM +0800, Wu Fengguang wrote:
>  	}
>  
> +	blk_start_plug(&plug);
>  	written = mapping->a_ops->direct_IO(WRITE, iocb, iov, pos, *nr_segs);
> +	blk_finish_plug(&plug);

Please move the plugging into ->direct_IO for both read and write, as
that is the boundary between generic highlevel code, and low-level block
code that should know about plugs.
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