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staging: erofs: add compacted compression indexes support
This patch aims at compacted compression indexes:
1) cleanup z_erofs_map_blocks_iter and move into zmap.c;
2) add compacted 4/2B decoding support.
On kirin980 platform, sequential read is increased about
6% (725MiB/s -> 770MiB/s) on enwik9 dataset if compacted 2B
feature is enabled.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>