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blk-snap - Coggle Diagram

- - - - per block device
      - blkfilter_operations
      - can loadable module
    - - temporary and released when backup is completed
      - simplify the backup algorithm
        +and reduce consumption of system resources
      - universality snapshot for all block devices
      - linear reading block spaces
      - during snapshot, copy old data to difference storage for snapshot
        
        note this change somewhere
        
        continue to write to original block device after the copy is done
        
        read from diff-storage for builing snapshot
      - snapshot image is one block device
        
        SNAPSHOT_TAKE
        
        create snapshot image block device
    - - how to use blk-snaphot for backup
        
        snapshot is one block device
    - - store the data of the original block devices in the snapshot
      - one for all
    - - CBT map
        
        Change block
        tracking allows to create incremental or differential backups
      - A change tracker map is created for each block device
      - One byte of this map corresponds to one block