erofs: implement fscache-based data readahead
Implement fscache-based data readahead. Also registers an individual bdi for each erofs instance to enable readahead. Signed-off-by: NJeffle Xu <jefflexu@linux.alibaba.com> Reviewed-by: NGao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20220425122143.56815-21-jefflexu@linux.alibaba.comAcked-by: NChao Yu <chao@kernel.org> Signed-off-by: NGao Xiang <hsiangkao@linux.alibaba.com>
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