For trees have been balanced, leaves are with flag BTRFS_HEADER_FLAG_RELOC and
extent data backrefs are shared. Like:
=====================
       item 0 key (11927552 EXTENT_ITEM 524288) itemoff 3932 itemsize 63
                refs 129 gen 7 flags DATA
                shared data backref parent 35897344 count 41
                shared data backref parent 35426304 count 37
                shared data backref parent 35422208 count 51
=====================

Then make the leaf which owns the extent data cowed. The shared data
backref was to transferred to keyed data ref, but remaining backrefs are
still shared. Like:
=====================
        item 0 key (11927552 EXTENT_ITEM 524288) itemoff 3887 itemsize 108
                refs 129 gen 7 flags DATA
                extent data backref root 5 objectid 258 offset 0 count 40
                extent data backref root 5 objectid 257 offset 0 count 1
                shared data backref parent 35426304 count 37
                shared data backref parent 35422208 count 51
=====================

However lowmem mode used to iterate the whole inode to find all
references, and doesn't care if a reference is already counted by the
shared tree block.

Add the test case to check it.

Signed-off-by: Su Yue <suy.f...@cn.fujitsu.com>
---
 .../keyed_data_ref_with_reloc_leaf.img          | Bin 0 -> 16384 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 
tests/fsck-tests/020-extent-ref-cases/keyed_data_ref_with_reloc_leaf.img

diff --git 
a/tests/fsck-tests/020-extent-ref-cases/keyed_data_ref_with_reloc_leaf.img 
b/tests/fsck-tests/020-extent-ref-cases/keyed_data_ref_with_reloc_leaf.img
new file mode 100644
index 
0000000000000000000000000000000000000000..80345cf9498f296f001b8b63e230bcfb9293300d
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literal 0
HcmV?d00001

-- 
2.17.1



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