ext4: warn when page is dirtied without buffers
Warn when a page is dirtied without buffers (as that will likely lead to a crash in ext4_writepages()) or when it gets newly dirtied without the page being locked (as there is nothing that prevents buffers to get stripped just before calling set_page_dirty() under memory pressure). Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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