Storage management method and storage management device

A storage management device, accessing a storage apparatus by a file system, the storage apparatus comprising a plurality of blocks, the file system comprising a plurality of logical blocks mapped to the plurality of blocks, each of the plurality of logical blocks having a logical block number;

• the storage management device comprising:
• a processor, performing, according to at least one instruction in a memory, steps of:
• receiving a first storage request to store first data of a first type;
• dividing a first logical block of the plurality of logical blocks into a plurality of logical sub-blocks in response to the first storage request;
• allocating a first logical sub-block of the plurality of logical sub-blocks to the first data;
• generating a first logical identification code mapped to the first logical sub-block to record, in the first logical identification code, a status flag of the first type corresponding to a first value, a logical sub-block number of the first logical sub-block and a logical block number of the first logical block;
• receiving a second storage request to store second data of a second type;
• allocating a second logical block of the plurality of the logical blocks to the second data in response to the second storage request;
• and
• generating a second logical identification code mapped to the second logical block to record, in the second logical identification code, a status flag of the second type corresponding to a second value, a predetermined logical sub-block number and a logical block number of the second logical block.