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. 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. 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
compression level (0 ~ 9).
number of threads (1 ~ 32) to be used to process the image dump
-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 refer‐
enced. Use this option if your extent tree is corrupted to make
sure that all of the metadata is captured.
btrfs-image is part of btrfs-progs. 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.