Provided by: btrfs-tools_3.12-1ubuntu0.2_amd64 
NAME
btrfs-image - create/restore an image of the filesystem
SYNOPSIS
btrfs-image [options] source target
DESCRIPTION
btrfs-image is used to create an image of a btrfs filesystem. All data will be zeroed, but metadata and
the like is preserved. source is the special file corresponding to the device containing a btrfs
filesystem. (e.g /dev/sdXX). target is the image file that btrfs-image creates. When used with -r
option, btrfs-image restores the image file from source into target.
OPTIONS
-r restore metadump image.
-c value
compression level (0 ~ 9).
-t value
number of threads (1 ~ 32) to be used to process the image dump or restore.
-o use the old restore method, this does not fixup the chunk tree so the restored file system will
not be able to be mounted.
-s 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.
-w 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.
AVAILABILITY
btrfs-image is part of btrfs-tools. Btrfs is currently under heavy development, and not suitable for any
uses other than benchmarking and review. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
further details.
SEE ALSO
btrfsck(8),mkfs.btrfs(8) BTRFS-IMAGE(8)