Provided by: btrfs-tools_4.4-1_i386 bug


       btrfs-image - create/restore an image of the filesystem


       btrfs-image [options] <source> <target>


       btrfs-image is used to create an image of a btrfs filesystem. All data
       will be zeroed, but metadata and the like is preserved. Mainly used for
       debugging purposes.

       In the dump mode, source is the btrfs device/file and target is the
       output file (use - for stdout).

       In the restore mode (option -r), source is the dumped image and target
       is the btrfs device/file.


           Restore metadump image. By default, this fixes super’s chunk tree,
           by using 1 stripe pointing to primary device, so that file system
           can be restored by running tree log reply if possible. To restore
           without changing number of stripes in chunk tree check -o option.

       -c <value>
           Compression level (0 ~ 9).

       -t <value>
           Number of threads (1 ~ 32) to be used to process the image dump or

           Use the old restore method, this does not fixup the chunk tree so
           the restored file system will not be able to be mounted.

           Sanitize the file names when generating the image. One -s means
           just generate random garbage, which means that the directory
           indexes won’t match up since the hashes won’t match with the
           garbage filenames. Using -ss will calculate a collision for the
           filename so that the hashes match, and if it can’t calculate a
           collision then it will just generate garbage. The collision
           calculator is very time and CPU intensive so only use it if you are
           having problems with your file system tree and need to have it
           mostly working.

           Walk all the trees manually and copy any blocks that are
           referenced. Use this option if your extent tree is corrupted to
           make sure that all of the metadata is captured.

           Restore for multiple devices, more than 1 device should be


       btrfs-image will return 0 if no error happened. If any problems
       happened, 1 will be returned.