A page is a fixed-size block of data.
一个分页就是一个固定大小的数据块。
If the size of the reallocated block is smaller than the original block, the block is split and the extra block is returned to the free tree with the required size block being returned to the caller.
如果重新分配的块小于原来的块，那么把它分割开，多余的块返回给空闲树，请求的块返回给调用者。
Around 10k block size, block-level compression starts to look moderately good; and at 100k block size it becomes very close to the file-level compression techniques.
块大小约为10k时，块级别压缩开始显得比较不错；块大小为100k时，块级别压缩就非常接近文件级别压缩技术了。
Around 10k block size, block-level compression starts to look moderately good; and at 100k block size it becomes very close to the file-level compression techniques.
块大小约为10k时，块级别压缩开始显得比较不错；块大小为100k时，块级别压缩就非常接近文件级别压缩技术了。
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