f2fs: readahead contiguous current summary blocks in checkpoint
Let's add readahead code for reading contiguous compact/normal summary blocks in checkpoint, then we will gain better performance in mount procedure. Changes from v1 o remove inappropriate 'unlikely' in npages_for_summary_flush. Signed-off-by: NChao Yu <chao2.yu@samsung.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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