Re: [PATCH] Check for compound pages in set_page_dirty()

[Christoph Lameter]

On Thu, 19 Jul 2007 18:35:17 +0100 (BST)
Hugh Dickins <hugh@xxxxxxxxxxx> wrote:

> I didn't see any attention to set_page_dirty in Christoph's
> Large Blocksize (variable page_cachesize) patches, but I expect
> he'd also be wanting set_page_dirty to act on compound_head.

There is no need for special casing if set_page_dirty() is only
ever called for page heads. Make sure that direct I/O does not call
set_page_dirty for tail pages.

A VM_BUG_ON(PageTail(page)) could be used to make sure that this
does not happen in the future?
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