Disk Data Reading/Writing Method and Device

A method for writing disk data, wherein a disk comprises:

• a primary metadata block storing metadata, a backup metadata block for backing up the metadata, and at least one object block group;
• each object block group comprises:
• a data block storing object data, and an index block storing an index of the object data;
• the primary metadata block is located at a head of the disk;
• and the backup metadata block is located at a tail of the disk;
• the at least one object block group is located between the primary metadata block and the backup metadata block;
• the method comprises:
• receiving a writing instruction for target object data;
• determining an idle first data block in the at least one object block group, and determining a first object block group corresponding to the first data block;
• and
• writing the target object data into the first data block of the first object block group, and updating an index in an index block in the first object block group, the metadata in the primary metadata block and the metadata backed up in the backup metadata block according to an identifier of the target object data.

An apparatus for reading disk data, wherein a disk comprises a primary metadata block storing metadata, a backup metadata block for backing up the metadata, and at least one object block group;

• each object block group comprises a data block storing object data, an index block storing an index of the object data;
• the primary metadata block is located at a head of the disk;
• the backup metadata block is located at a tail of the disk;
• the at least one object block group is located between the primary metadata block and the backup metadata block;
• the apparatus comprises:
• an instruction receiving unit, configured for receiving a read instruction for target object data;
• an information determining unit, configured for determining a first data block corresponding to the target object data according to an identifier of the target object data, the metadata in the primary metadata block, the metadata backed up in the backup metadata block, and an index in the index block in each object block group, and determining a first object block group in which the first data block is located;
• and
• a data reading unit, configured for reading the target object data from the first data block of the first object block group.