btrfs-progs: tests: Add SHARED_DATA_REF test image for check lowmem mode

Introduce a new image, which contains external SHARED_DATA_REF items to
trigger a lowmem mode false alert.

The image only contains external SHARED_DATA_REF and no inlined data
backref.

Before the image, we only have inlined shared data ref, which is not
enough to trigger lowmem mode false alert.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/tests/fsck-tests/020-extent-ref-cases/shared_data_ref_only.img b/tests/fsck-tests/020-extent-ref-cases/shared_data_ref_only.img
new file mode 100644 (file)
index 0000000..6d2b95e
Binary files /dev/null and b/tests/fsck-tests/020-extent-ref-cases/shared_data_ref_only.img differ