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[thin_show_dups] variable_chunk_stream

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This commit is contained in:
Joe Thornber
2015-09-03 13:02:29 +01:00
parent d44a817c60
commit 750ce0f47b
14 changed files with 709 additions and 104 deletions
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53
thin-provisioning/cache_stream.cc
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@@ -32,9 +32,8 @@ cache_stream::cache_stream(string const &path,
v_(new bcache::noop_validator()),
cache_(new block_cache(fd_, block_size / 512, nr_blocks_, cache_mem)),
current_index_(0) {
load(0);
for (block_address i = 1; i < min(cache_blocks_, nr_blocks_); i++)
cache_->prefetch(i);
rewind();
}
block_address
@@ -46,19 +45,27 @@ cache_stream::nr_chunks() const
void
cache_stream::rewind()
{
load(0);
current_index_ = 0;
for (block_address i = 1; i < min(cache_blocks_, nr_blocks_); i++)
cache_->prefetch(i);
}
bool
cache_stream::advance(block_address count)
cache_stream::next(block_address count)
{
if (current_index_ + count >= nr_blocks_)
return false;
current_index_ = min(current_index_ + count, nr_blocks_);
current_index_ += count;
if (current_index_ + cache_blocks_ < nr_blocks_)
cache_->prefetch(current_index_ + cache_blocks_);
load(current_index_);
return true;
return !eof();
}
bool
cache_stream::eof() const
{
return current_index_ >= nr_blocks_;
}
block_address
@@ -68,24 +75,26 @@ cache_stream::index() const
}
chunk const &
cache_stream::get() const
cache_stream::get()
{
return current_chunk_;
chunk_wrapper *w = new chunk_wrapper(*this);
return w->c_;
}
void
cache_stream::load(block_address b)
cache_stream::put(chunk const &c)
{
current_index_ = b;
current_block_ = cache_->get(current_index_, 0, v_);
chunk_wrapper *w = container_of(const_cast<chunk *>(&c), chunk_wrapper, c_);
delete w;
}
current_chunk_.offset_sectors_ = (b * block_size_) / 512;
current_chunk_.mem_.clear();
current_chunk_.mem_.push_back(mem(static_cast<uint8_t *>(current_block_.get_data()),
static_cast<uint8_t *>(current_block_.get_data()) + block_size_));
if (current_index_ + cache_blocks_ < nr_blocks_)
cache_->prefetch(current_index_ + cache_blocks_);
cache_stream::chunk_wrapper::chunk_wrapper(cache_stream &parent)
: block_(parent.cache_->get(parent.current_index_, 0, parent.v_))
{
c_.offset_ = parent.current_index_ * parent.block_size_;
c_.len_ = parent.block_size_;
c_.mem_.push_back(mem(static_cast<uint8_t *>(block_.get_data()),
static_cast<uint8_t *>(block_.get_data()) + parent.block_size_));
}
//----------------------------------------------------------------