f2fs: readahead contiguous pages for restore_node_summary

If cp has no CP_UMOUNT_FLAG, we will read all pages in whole node segment
one by one, it makes low performance. So let's merge contiguous pages and
readahead for better performance.

Signed-off-by: Chao Yu <[email protected]>
[Jaegeuk Kim: adjust the new bio operations]
Signed-off-by: Jaegeuk Kim <[email protected]>
1 file changed