/usr/bin/btrfs-convert

usage: btrfs-convert [options] device

In-place conversion from other filesystems to BTRFS

Options:
-d, --no-datasum          disable data checksum, sets NODATASUM
-i, --no-xattr            ignore xattrs and ACLs
-n, --no-inline           disable inlining of small files to metadata
--csum TYPE
--checksum TYPE           checksum algorithm to use (default: crc32c)
-N, --nodesize SIZE       set filesystem metadata nodesize
-r, --rollback            roll back to the original filesystem
-l, --label LABEL         set filesystem label
-L, --copy-label          use label from converted filesystem
--uuid SPEC               new, copy or user-defined conforming UUID
-p, --progress            show converting progress (default)
-O, --features LIST       comma separated list of filesystem features
--no-progress             show only overview, not the detailed progress

General:
--version                 print the btrfs-convert version, builtin features and exit
--help                    print this help and exit

Supported filesystems:
	ext2/3/4: yes
	reiserfs: no