ext4: use redirty_page_for_writepage() in ext4_bio_write_page()
When we cannot write a page we should use redirty_page_for_writepage() instead of plain set_page_dirty(). That tells writeback code we have problems, redirties only the page (redirtying buffers is not needed), and updates mm accounting of failed page writes. Also move clearing of buffer dirty flag after io_submit_add_bh(). At that moment we are sure buffer will be going to disk. Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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