erofs: introduce fscache-based domain
A new fscache-based shared domain mode is going to be introduced for erofs. In which case, same data blobs in same domain will be shared and reused to reduce on-disk space usage. The implementation of sharing blobs will be introduced in subsequent patches. Signed-off-by: NJia Zhu <zhujia.zj@bytedance.com> Reviewed-by: NJingbo Xu <jefflexu@linux.alibaba.com> Link: https://lore.kernel.org/r/20220918043456.147-4-zhujia.zj@bytedance.comSigned-off-by: NGao Xiang <hsiangkao@linux.alibaba.com>
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