there is a problem on libguestfs-1.29.40 after  command :make check


libguestfs: error: mkfs_btrfs: /dev/vda1: device /dev/vda1 is too small (must be at least 256 MB)
FAIL: test_btrfs_image_0
  3/515 test_btrfstune_enable_skinny_metadata_extent_refs_0
libguestfs: error: btrfstune_enable_skinny_metadata_extent_refs: /dev/vda1: btrfstune: invalid option -- 'x'
usage: btrfstune [options] device
    -S value    enable/disable seeding
FAIL: test_btrfstune_enable_skinny_metadata_extent_refs_0
  4/515 test_btrfstune_enable_extended_inode_refs_0
libguestfs: error: btrfstune_enable_extended_inode_refs: /dev/vda1: btrfstune: invalid option -- 'r'
usage: btrfstune [options] device
    -S value    enable/disable seeding
FAIL: test_btrfstune_enable_extended_inode_refs_0
  5/515 test_btrfstune_seeding_0
libguestfs: error: btrfstune_seeding: /dev/vda1: btrfstune: invalid option -- 'f'

I found two patch
https://www.redhat.com/archives/libguestfs/2012-May/msg00018.htmlvirt-make-fs     Fix estimation when making btrfs (but there is no virt-make-fs under tools)
https://www.redhat.com/archives/libguestfs/2012-April/msg00008.html    New API: mkfs-btrfs for creating btrfs filesystems ( It was patched in  libguestfs-1.29.40)

It seems stupid, but I can't find the answer, I am sorry