ext4: fix double unlock buffer mess during fs-resize
bh_submit_read() is responsible for unlock bh on endio. In addition, we need to use bh_uptodate_or_lock() to avoid races. Signed-off-by: NDmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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