ext4: handle EOF correctly in ext4_bio_write_page()
We need to zero out part of a page which beyond EOF before setting uptodate, otherwise, mapread or write will see non-zero data beyond EOF. Signed-off-by: NYongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
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