Re: [PATCH] Add readpages support for block devices

[Wu Fengguang]

On Sat, Dec 18, 2010 at 10:20:49AM +0100, Christoph Hellwig wrote:
> We already used to have this and Jens reverted it in commit
> 172124e220f1854acc99ee394671781b8b5e2120.  I can't find a better
> explanation than his rather brief commit message, but he might not more.

The discussion goes here

http://www.gossamer-threads.com/lists/linux/kernel/1085325?do=post_view_threaded#1085325

The problem happens on ext3 fs, non-4k aligned partition and 64K page
size. Jeff also find it hurts dump performance. Then it's reverted
since no one seems to have the time to dig further.

Thanks,
Fengguang
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