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[thin_repair, thin_dump] Don't look for better roots if the ones in the sb are ok.

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Calculating the most recent trees is inexact, so trees other than the ones
in the superblock, which presumably are the most recent, could be chosen.
This commit is contained in:
Joe Thornber 2019-05-27 16:43:32 +01:00
parent 5e6ddbf2da
commit 0624ded67f
1 changed files with 66 additions and 50 deletions
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72
thin-provisioning/metadata_dumper.cc
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@ -741,36 +741,9 @@ namespace {
// metadata snap, we really don't know
return 0ull;
}
}
//----------------------------------------------------------------
void
thin_provisioning::metadata_dump(metadata::ptr md, emitter::ptr e, dump_options const &opts)
{
details_extractor de(opts);
device_tree_detail::damage_visitor::ptr dd_policy(details_damage_policy(false));
walk_device_tree(*md->details_, de, *dd_policy);
e->begin_superblock("", md->sb_.time_,
md->sb_.trans_id_,
md->sb_.flags_,
md->sb_.version_,
md->sb_.data_block_size_,
get_nr_blocks(md),
boost::optional<block_address>());
{
mapping_tree_detail::damage_visitor::ptr md_policy(mapping_damage_policy(false));
mapping_tree_emitter mte(opts, md, e, de.get_details(), mapping_damage_policy(false));
walk_mapping_tree(*md->mappings_top_level_, mte, *md_policy);
}
e->end_superblock();
}
void
thin_provisioning::metadata_repair(block_manager<>::ptr bm, emitter::ptr e)
metadata_repair_(block_manager<>::ptr bm, emitter::ptr e)
{
// We assume the superblock is wrong, and find the best roots
// for ourselves. We've had a few cases where people have
@ -825,6 +798,49 @@ thin_provisioning::metadata_repair(block_manager<>::ptr bm, emitter::ptr e)
e->end_superblock();
}
}
//----------------------------------------------------------------
void
thin_provisioning::metadata_dump(metadata::ptr md, emitter::ptr e, dump_options const &opts)
{
details_extractor de(opts);
device_tree_detail::damage_visitor::ptr dd_policy(details_damage_policy(false));
walk_device_tree(*md->details_, de, *dd_policy);
e->begin_superblock("", md->sb_.time_,
md->sb_.trans_id_,
md->sb_.flags_,
md->sb_.version_,
md->sb_.data_block_size_,
get_nr_blocks(md),
boost::optional<block_address>());
{
mapping_tree_detail::damage_visitor::ptr md_policy(mapping_damage_policy(false));
mapping_tree_emitter mte(opts, md, e, de.get_details(), mapping_damage_policy(false));
walk_mapping_tree(*md->mappings_top_level_, mte, *md_policy);
}
e->end_superblock();
}
void
thin_provisioning::metadata_repair(block_manager<>::ptr bm, emitter::ptr e)
{
auto sb = read_superblock(*bm);
auto tm = open_tm(bm, superblock_detail::SUPERBLOCK_LOCATION);
if (get_dev_ids(*tm, sb.device_details_root_) && get_map_ids(*tm, sb.data_mapping_root_)) {
// The roots in the superblock look ok (perhaps the corruption was in the
// space maps). Just dump the metadata skipping repair.
dump_options opts;
auto md = metadata::ptr(new metadata(bm, false));
metadata_dump(md, e, opts);
} else
metadata_repair_(bm, e);
}
//----------------------------------------------------------------