f2fs: seperate read nat page from nat_tree_lock
This patch seperate nat page read io from nat_tree_lock. -lock_page -get_node_info() -current_nat_addr ...... -> write_checkpoint -get_meta_page Because we lock node page, we can make sure no other threads modify this nid concurrently. So we just obtain current_nat_addr under nat_tree_lock, node info is always same in both nat pack. Signed-off-by: NYunlei He <heyunlei@huawei.com> Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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