Re: allowed pages in the block later, was Re: [Ext2-devel] [PATCH]ext3: avoid sending down non-refcounted pages

[Andrew Morton]

Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
>
> The problem we're trying to solve here is how do implement network block
>  devices (nbd, iscsi) efficiently.  The zero copy codepath in the networking
>  layer does need to grab additional references to pages.  So to use sendpage
>  we need a refcountable page.  pages used by the slab allocator are not
>  normally refcounted so try to do get_page/pub_page on them will break.

I don't get it.  Doing get_page/put_page on a slab-allocated page should do
the right thing?
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