e6203e6ff9
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.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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|---|---|---|
| .. | ||
| block_group_item_false_alert.raw.xz | ||
| extent_data_ref.img | ||
| inline_regular_coexist.img | ||
| keyed_block_ref.img | ||
| keyed_data_ref.img | ||
| keyed_data_ref_only.img | ||
| keyed_data_ref_with_reloc_leaf.img | ||
| keyed_data_ref_with_shared_leaf.img | ||
| no_inline_ref.img | ||
| no_skinny_ref.img | ||
| ref_count_mismatch_false_alert.img | ||
| shared_block_ref.img | ||
| shared_block_ref_only.raw.xz | ||
| shared_data_ref.img | ||
| shared_data_ref_only.img | ||
| test.sh | ||