Method for deducing effective data block bitmap based on XFS file system

The invention discloses a method for deducing a valid data block bitmap based on an XFS file system, and belongs to the technical field of computer data backup and restoration, and the method comprises the following steps: constructing the valid data block bitmap and initializing the valid data block bitmap into a fully valid state, and obtaining and arranging free space distribution information sets in all distribution groups based on the free space distribution information sets; according to the effective data synchronization method and device, the effective data of the file system can be synchronized more conveniently and more standardly based on the block bitmaps, and the problems of data redundancy, low effective data synchronization speed and the like do not exist; the internal structure details of the file system are avoided, and the multiple improvement of the effective data synchronization speed is realized under the condition that a very small amount of redundant data exists. 本发明公开了基于XFS文件系统推演有效数据块位