Add the testcase for false alert of data extent backref lost with the
extent offset.

The image can be reproduced by the following commands:
------
dev=~/test.img
mnt=/mnt/btrfs

umount $mnt &> /dev/null
fallocate -l 128M $dev

mkfs.btrfs $dev
mount $dev $mnt

for i in `seq 1 10`; do
        xfs_io -f -c "pwrite 0 2K" $mnt/file$i
done

xfs_io -f -c "falloc 0 64K" $mnt/file11

for i in `seq 1 32`; do
        xfs_io -f -c "reflink $mnt/file11 0 $(($i * 64))K 64K" $mnt/file11
done

xfs_io -f -c "reflink $mnt/file11 32K $((33 * 64))K 32K" $mnt/file11

btrfs subvolume snapshot $mnt $mnt/snap1

umount $mnt
btrfs-image -c9 $dev extent_data_ref.img
------

Signed-off-by: Lu Fengqi <lufq.f...@cn.fujitsu.com>
---
 .../fsck-tests/020-extent-ref-cases/extent_data_ref.img  | Bin 0 -> 6144 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 tests/fsck-tests/020-extent-ref-cases/extent_data_ref.img

diff --git a/tests/fsck-tests/020-extent-ref-cases/extent_data_ref.img 
b/tests/fsck-tests/020-extent-ref-cases/extent_data_ref.img
new file mode 100644
index 
0000000000000000000000000000000000000000..3ab2396ba9c810d98f16a5efcf7fe23ee4b12ab5
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-- 
2.16.2



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