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[thin] Make the metadata class resposible for locating metadata snapshots

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This commit is contained in:
Joe Thornber
2015-12-15 10:08:07 +00:00
parent 30a3bf67d1
commit a709b9718b
6 changed files with 104 additions and 77 deletions
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59
thin-provisioning/metadata.cc
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@@ -112,33 +112,32 @@ metadata::metadata(block_manager<>::ptr bm, open_type ot,
}
}
metadata::metadata(block_manager<>::ptr bm, block_address metadata_snap)
metadata::metadata(block_manager<>::ptr bm)
{
tm_ = open_tm(bm);
sb_ = read_superblock(tm_->get_bm(), SUPERBLOCK_LOCATION);
open_space_maps();
open_btrees();
}
metadata::metadata(block_manager<>::ptr bm,
boost::optional<block_address> metadata_snap)
{
tm_ = open_tm(bm);
if (metadata_snap) {
if (metadata_snap != sb_.metadata_snap_)
superblock_detail::superblock actual_sb = read_superblock(bm, SUPERBLOCK_LOCATION);
if (!actual_sb.metadata_snap_)
throw runtime_error("no current metadata snap");
if (metadata_snap && *metadata_snap != actual_sb.metadata_snap_)
throw runtime_error("metadata snapshot does not match that in superblock");
sb_ = read_superblock(tm_->get_bm(), metadata_snap);
sb_ = read_superblock(bm, actual_sb.metadata_snap_);
// metadata snaps don't record the space maps
} else {
sb_ = read_superblock(tm_->get_bm(), SUPERBLOCK_LOCATION);
metadata_sm_ = open_metadata_sm(*tm_, &sb_.metadata_space_map_root_);
tm_->set_sm(metadata_sm_);
data_sm_ = open_disk_sm(*tm_, static_cast<void *>(&sb_.data_space_map_root_));
}
details_ = device_tree::ptr(new device_tree(*tm_, sb_.device_details_root_,
device_tree_detail::device_details_traits::ref_counter()));
mappings_top_level_ = dev_tree::ptr(new dev_tree(*tm_, sb_.data_mapping_root_,
mapping_tree_detail::mtree_ref_counter(tm_)));
mappings_ = mapping_tree::ptr(new mapping_tree(*tm_, sb_.data_mapping_root_,
mapping_tree_detail::block_time_ref_counter(data_sm_)));
// metadata snaps don't record the space maps
open_btrees();
}
void
@@ -158,4 +157,22 @@ metadata::commit()
superblock_traits::pack(sb_, *disk);
}
void metadata::open_space_maps()
{
metadata_sm_ = open_metadata_sm(*tm_, &sb_.metadata_space_map_root_);
tm_->set_sm(metadata_sm_);
data_sm_ = open_disk_sm(*tm_, static_cast<void *>(&sb_.data_space_map_root_));
}
void metadata::open_btrees()
{
details_ = device_tree::ptr(new device_tree(*tm_, sb_.device_details_root_,
device_tree_detail::device_details_traits::ref_counter()));
mappings_top_level_ = dev_tree::ptr(new dev_tree(*tm_, sb_.data_mapping_root_,
mapping_tree_detail::mtree_ref_counter(tm_)));
mappings_ = mapping_tree::ptr(new mapping_tree(*tm_, sb_.data_mapping_root_,
mapping_tree_detail::block_time_ref_counter(data_sm_)));
}
//----------------------------------------------------------------