Finally, we are going to add tree-checker support for extent items, which includes: - EXTENT_ITEM/METADATA_ITEM Which futher contains inline backrefs of: * TREE_BLOCK_REF * SHARED_BLOCK_REF * EXETNT_DATA_REF * SHARED_DATA_REF - TREE_BLOCK_REF - SHARED_BLOCK_REF - EXTENT_DATA_REF - SHARED_DATA_REF Keyed version of the above types The complexity of the on-disk format can be found in the first patch, which contains a basic introduction as comment. Hidden pitfalls are everywhere, e.g. inlined EXTENT_DATA_REF don't use iref->offset, but put its own data at iref->offset. But SHARED_DATA_REF uses iref->offset, and put extra data after iref. Such on-disk layout makes sense, but definitely a mess to read. Thankfully we at least have print-tree code from btrfs-progs as a reference. Qu Wenruo (3): btrfs: tree-checker: Add EXTENT_ITEM and METADATA_ITEM check btrfs: tree-checker: Add simple keyed refs check btrfs: tree-checker: Add EXTENT_DATA_REF check fs/btrfs/ctree.h | 1 + fs/btrfs/extent-tree.c | 2 +- fs/btrfs/tree-checker.c | 335 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 337 insertions(+), 1 deletion(-) -- 2.22.0
