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[thin_repair/thin_dump] Change the label type for empty leaves

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Empty leaves now are treated as bottom-level leaves, so that empty
devices could be recovered.
This commit is contained in:
Ming-Hung Tsai 2021-08-19 18:38:23 +08:00
parent c2e6db74b9
commit d1e8168fb6
1 changed files with 8 additions and 0 deletions
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8
thin-provisioning/metadata_dumper.cc
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@ -438,6 +438,14 @@ namespace {
// in the bottom 24 bits. This means every block/time apart from block 0 // in the bottom 24 bits. This means every block/time apart from block 0
// will result in a value that's outside the range of the metadata device. // will result in a value that's outside the range of the metadata device.
bool is_top_level(node_ref<uint64_traits> &n) { bool is_top_level(node_ref<uint64_traits> &n) {
// A leaf node of value-size 8 and without mappings should be
// treated as a bottom-level leaf, so that it could be referenced
// by top-level nodes, if any. On the other hand, an empty
// top-level leaf doesn't help repairing.
if (!n.get_nr_entries()) {
return false;
}
auto nr_metadata_blocks = bm_.get_nr_blocks(); auto nr_metadata_blocks = bm_.get_nr_blocks();
for (unsigned i = 0; i < n.get_nr_entries(); i++) for (unsigned i = 0; i < n.get_nr_entries(); i++)