Analysis

Centralised Summary has two different types of strategy to store log node.

The first uses the first available not bad block (NAND) and the block has to be in the first three blocks.

The other uses the same log node but it has not got special place to store, it is stored the same method as the other nodes (inode, dirent, etc.). After the log node is written out to the flash the fs sets the centsum_offset SysFs parameter to the written log node's offset. At mount time CS gets the offset of the log node from mount parameter.