ext4: dirty page has always buffers attached
ext4_writepage(), write_cache_pages_da(), and mpage_da_submit_io() doesn't have to deal with the case when page doesn't have buffers. We attach buffers to a page in ->write_begin() and ->page_mkwrite() which covers all places where a page can become dirty. Signed-off-by:Jan Kara <jack@suse.cz> Signed-off-by:
"Theodore Ts'o" <tytso@mit.edu>
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