Andrew Morton wrote:

David Chow [off-list ref] wrote:

quoted

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.

Make that:

	lock_page(page);
	kaddr = kmap_atomic(page, KM_USER0);
	memset(kaddr, ...);
	flush_dcache_page(page)
	kunmap_atomic(kaddr, KM_USER0);
	set_page_dirty(page);
	unlock_page(page);
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