Re: dirty pages path in kernel

[Andrew Morton <akpm@digeo.com>]

David Chow <davidchow@shaolinmicro.com> wrote:
>
> Hi,
> 
> If I do the following to an inode mapping page .
> 
> 1. Generate a "struct page" from read_cache_page()
> 2. kmap() the page, do some memset() (Dirty the page)
> 3. kunmap() and page_cache_release() the page.
> 

The VFS does not know that the page has changed.

You should do:

	lock_page(page);
	memset()
	set_page_dirty(page);
	unlock_page(page);

the page will be written to disk on the next kupdate cycle.
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