erofs: add big physical cluster definition
Big pcluster indicates the size of compressed data for each physical pcluster is no longer fixed as block size, but could be more than 1 block (more accurately, 1 logical pcluster) When big pcluster feature is enabled for head0/1, delta0 of the 1st non-head lcluster index will keep block count of this pcluster in lcluster size instead of 1. Or, the compressed size of pcluster should be 1 lcluster if pcluster has no non-head lcluster index. Also note that BIG_PCLUSTER feature reuses COMPR_CFGS feature since it depends on COMPR_CFGS and will be released together. Link: https://lore.kernel.org/r/20210407043927.10623-6-xiang@kernel.org Acked-by:Chao Yu <yuchao0@huawei.com> Signed-off-by:
Gao Xiang <hsiangkao@redhat.com>
parent
81382f5f
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