thin-provisioning-tools/thin-provisioning/rmap_visitor.cc

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#include "thin-provisioning/rmap_visitor.h"
#include <algorithm>
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#include <iostream>
using namespace thin_provisioning;
//----------------------------------------------------------------
rmap_visitor::rmap_visitor()
{
}
void
rmap_visitor::add_data_region(region const &r)
{
regions_.push_back(r);
}
void
rmap_visitor::visit(btree_path const &path,
mapping_tree_detail::block_time const &bt)
{
if (in_regions(bt.block_)) {
uint32_t thin_dev = path[0];
block_address thin_block = path[1];
visit_block(thin_dev, thin_block, bt.block_);
}
}
namespace {
bool cmp_data_begin(rmap_visitor::rmap_region const &lhs,
rmap_visitor::rmap_region const &rhs) {
return lhs.data_begin < rhs.data_begin;
};
}
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void
rmap_visitor::complete()
{
if (current_rmap_)
push_current();
std::sort(rmap_.begin(), rmap_.end(), cmp_data_begin);
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}
vector<rmap_visitor::rmap_region> const &
rmap_visitor::get_rmap() const
{
return rmap_;
}
// Slow, but I suspect we wont run with many regions.
bool
rmap_visitor::in_regions(block_address b) const
{
vector<region>::const_iterator it;
for (it = regions_.begin(); it != regions_.end(); ++it)
if (it->contains(b))
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return true;
return false;
}
bool
rmap_visitor::adjacent_block(rmap_region const &rr,
uint32_t thin_dev, block_address thin_block,
block_address data_block) const
{
block_address run_length = rr.data_end - rr.data_begin;
return (rr.thin_dev == thin_dev) &&
(data_block == rr.data_end) &&
(thin_block == rr.thin_begin + run_length);
}
void
rmap_visitor::insert_new_region(uint32_t thin_dev, block_address thin_block,
block_address data_block)
{
rmap_region rr;
rr.data_begin = data_block;
rr.data_end = data_block + 1;
rr.thin_dev = thin_dev;
rr.thin_begin = thin_block;
current_rmap_ = rr;
}
void
rmap_visitor::push_current()
{
rmap_.push_back(*current_rmap_);
current_rmap_ = boost::optional<rmap_region>();
}
void
rmap_visitor::visit_block(uint32_t thin_dev, block_address thin_block,
block_address data_block)
{
if (current_rmap_) {
if (adjacent_block(*current_rmap_, thin_dev, thin_block, data_block))
current_rmap_->data_end++;
else {
push_current();
insert_new_region(thin_dev, thin_block, data_block);
}
} else
insert_new_region(thin_dev, thin_block, data_block);
}
//----------------------------------------------------------------