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[thin_scan] Factor out range manipulation code

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This commit is contained in:
Ming-Hung Tsai 2016-03-05 22:31:09 +08:00
parent 400613305c
commit 6fb5f8241d
1 changed files with 36 additions and 13 deletions
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49
thin-provisioning/thin_scan.cc
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@ -151,10 +151,43 @@ namespace {
value_size_(rhs.value_size_), is_valid_(rhs.is_valid_)
{
}
uint64_t size() const {
return (end_ > begin_) ? (end_ - begin_) : 0;
}
// returns true if r is left or right-adjacent
bool is_adjacent_to(block_range const &r) const {
block_range const &lhs = begin_ < r.begin_ ? *this : r;
block_range const &rhs = begin_ < r.begin_ ? r : *this;
uint64_t common_end = std::min(end_, r.end_);
if (size() && r.size() &&
rhs.begin_ == common_end &&
((!blocknr_begin_ && !r.blocknr_begin_) ||
(blocknr_begin_ && r.blocknr_begin_ &&
*rhs.blocknr_begin_ > *lhs.blocknr_begin_ &&
(*rhs.blocknr_begin_ - *lhs.blocknr_begin_ == rhs.begin_ - lhs.begin_))) &&
type_ == r.type_ &&
ref_count_ == r.ref_count_ &&
value_size_ == r.value_size_ &&
is_valid_ == r.is_valid_)
return true;
return false;
}
bool concat(block_range const &r) {
if (!is_adjacent_to(r))
return false;
begin_ = std::min(begin_, r.begin_);
end_ = std::max(end_, r.end_);
return true;
}
};
void output_block_range(block_range const &r, std::ostream &out) {
if (r.end_ <= r.begin_)
if (!r.size())
return;
if (r.end_ - r.begin_ > 1) {
@ -288,18 +321,8 @@ namespace {
curr_range.ref_count_ = -1;
}
// output the current block
if (run_range.end_ == 0)
run_range = curr_range;
else if (((!curr_range.blocknr_begin_ && !run_range.blocknr_begin_) ||
(curr_range.blocknr_begin_ && run_range.blocknr_begin_ &&
*curr_range.blocknr_begin_ == *run_range.blocknr_begin_ + (run_range.end_ - run_range.begin_))) &&
curr_range.type_ == run_range.type_ &&
curr_range.ref_count_ == run_range.ref_count_ &&
curr_range.value_size_ == run_range.value_size_ &&
curr_range.is_valid_ == run_range.is_valid_) {
++run_range.end_;
} else {
// store the current block
if (!run_range.concat(curr_range)) {
output_block_range(run_range, out);
run_range = curr_range;
}