removed sparse-regions support

ChangeLog

@@ -1,3 +1,4 @@
+	* removed sparse-regions feature
 	* support using 0 disk threads (to perform disk I/O in network thread)
 	* removed deprecated handle_alert template
 	* enable logging build config by default (but alert mask disabled by default)

bindings/python/src/torrent_status.cpp

@@ -91,7 +91,6 @@ void bind_torrent_status()
         .def_readonly("seed_rank", &torrent_status::seed_rank)
         .def_readonly("last_scrape", &torrent_status::last_scrape)
         .def_readonly("has_incoming", &torrent_status::has_incoming)
-        .def_readonly("sparse_regions", &torrent_status::sparse_regions)
         .def_readonly("seed_mode", &torrent_status::seed_mode)
         .def_readonly("upload_mode", &torrent_status::upload_mode)
         .def_readonly("share_mode", &torrent_status::share_mode)

include/libtorrent/piece_picker.hpp

@@ -245,8 +245,6 @@ namespace libtorrent
 		// one past the last piece we do not have.
 		int reverse_cursor() const { return m_reverse_cursor; }
 
-		int sparse_regions() const { return m_sparse_regions; }
-
 		// sets all pieces to dont-have
 		void init(int blocks_per_piece, int blocks_in_last_piece, int total_num_pieces);
 		int num_pieces() const { return int(m_piece_map.size()); }
@@ -821,9 +819,6 @@ namespace libtorrent
 		// all the subsequent pieces
 		int m_reverse_cursor;
 
-		// the number of regions of pieces we don't have.
-		int m_sparse_regions;
-
 		// the number of pieces we have (i.e. passed + flushed).
 		// This includes pieces that we have filtered but still have
 		int m_num_have;

include/libtorrent/settings_pack.hpp

@@ -1083,17 +1083,6 @@ namespace libtorrent
 			// favour of a choked peer.
 			seeding_piece_quota,
 
-			// ``max_sparse_regions`` is a limit of the number of *sparse regions*
-			// in a torrent. A sparse region is defined as a hole of pieces we
-			// have not yet downloaded, in between pieces that have been
-			// downloaded. This is used as a hack for windows vista which has a
-			// bug where you cannot write files with more than a certain number of
-			// sparse regions. This limit is not hard, it will be exceeded. Once
-			// it's exceeded, pieces that will maintain or decrease the number of
-			// sparse regions are prioritized. To disable this functionality, set
-			// this to 0. It defaults to 0 on all platforms except windows.
-			max_sparse_regions,
-
 			// TODO: deprecate this
 			// ``max_rejects`` is the number of piece requests we will reject in a
 			// row while a peer is choked before the peer is considered abusive

include/libtorrent/torrent.hpp

@@ -1145,8 +1145,6 @@ namespace libtorrent
 
 	private:
 
-		void update_sparse_piece_prio(int piece, int start, int end);
-
 		void ip_filter_updated();
 
 		void inc_stats_counter(int c, int value = 1);
@@ -1537,11 +1535,6 @@ namespace libtorrent
 		// does not count when the torrent is stopped or paused
 		unsigned int m_seeding_time:24;
 
-		// this is a counter that is decreased every
-		// second, and when it reaches 0, the peer_list::pulse()
-		// is called and the time scaler is reset to 10.
-		boost::int8_t m_time_scaler;
-
 // ----
 
 		// the maximum number of uploads for this torrent

include/libtorrent/torrent_handle.hpp

@@ -1581,11 +1581,6 @@ namespace libtorrent
 		// If it has never done that, this value is -1.
 		int last_scrape;
 
-		// the number of regions of non-downloaded pieces in the torrent. This is
-		// an interesting metric on windows vista, since there is a limit on the
-		// number of sparse regions in a single file there.
-		int sparse_regions;
-
 		// the priority of this torrent
 		int priority;
 

src/piece_picker.cpp

@@ -80,7 +80,6 @@ namespace libtorrent
 		, m_num_have_filtered(0)
 		, m_cursor(0)
 		, m_reverse_cursor(0)
-		, m_sparse_regions(1)
 		, m_num_have(0)
 		, m_num_pad_files(0)
 		, m_dirty(false)
@@ -1698,27 +1697,6 @@ namespace libtorrent
 			erase_download_piece(i);
 		}
 
-// maintain sparse_regions
-		if (index == 0)
-		{
-			if (index == int(m_piece_map.size()) - 1
-				|| m_piece_map[index + 1].have())
-				--m_sparse_regions;
-		}
-		else if (index == int(m_piece_map.size() - 1))
-		{
-			if (index == 0
-				|| m_piece_map[index - 1].have())
-				--m_sparse_regions;
-		}
-		else
-		{
-			bool have_before = m_piece_map[index-1].have();
-			bool have_after = m_piece_map[index+1].have();
-			if (have_after && have_before) --m_sparse_regions;
-			else if (!have_after && !have_before) ++m_sparse_regions;
-		}
-
 		if (p.filtered())
 		{
 			--m_num_filtered;
@@ -2649,7 +2627,6 @@ get_out:
 			, first_block);
 	}
 
-
 	int piece_picker::add_blocks(int piece
 		, bitfield const& pieces
 		, std::vector<piece_block>& interesting_blocks

src/settings_pack.cpp

@@ -275,11 +275,6 @@ namespace libtorrent
 		SET(min_announce_interval, 5 * 60, 0),
 		SET(auto_manage_startup, 60, 0),
 		SET(seeding_piece_quota, 20, 0),
-#ifdef TORRENT_WINDOWS
-		SET(max_sparse_regions, 30000, 0),
-#else
-		SET(max_sparse_regions, 0, 0),
-#endif
 		SET(max_rejects, 50, 0),
 		SET(recv_socket_buffer_size, 0, &session_impl::update_socket_buffer_size),
 		SET(send_socket_buffer_size, 0, &session_impl::update_socket_buffer_size),

src/torrent.cpp

@@ -238,7 +238,6 @@ namespace libtorrent
 #endif
 		, m_need_save_resume_data(true)
 		, m_seeding_time(0)
-		, m_time_scaler(0)
 		, m_max_uploads((1<<24)-1)
 		, m_save_resume_flags(0)
 		, m_num_uploads(0)
@@ -4077,20 +4076,6 @@ namespace libtorrent
 
 	}
 
-	void torrent::update_sparse_piece_prio(int i, int start, int end)
-	{
-		TORRENT_ASSERT(m_picker);
-		if (m_picker->have_piece(i) || m_picker->piece_priority(i) == 0)
-			return;
-		bool have_before = i < start || m_picker->have_piece(i - 1);
-		bool have_after = i >= end || m_picker->have_piece(i + 1);
-		if (have_after && have_before)
-			m_picker->set_piece_priority(i, 7);
-		else if (have_after || have_before)
-			m_picker->set_piece_priority(i, 6);
-		update_gauge();
-	}
-
 	// this is called once we have completely downloaded piece
 	// 'index', its hash has been verified. It's also called
 	// during initial file check when we find a piece whose hash
@@ -4139,20 +4124,6 @@ namespace libtorrent
 			else p->fill_send_buffer();
 		}
 
-		if (settings().get_int(settings_pack::max_sparse_regions) > 0
-			&& has_picker()
-			&& m_picker->sparse_regions() > settings().get_int(settings_pack::max_sparse_regions))
-		{
-			// we have too many sparse regions. Prioritize pieces
-			// that won't introduce new sparse regions
-			// prioritize pieces that will reduce the number of sparse
-			// regions even higher
-			int start = m_picker->cursor();
-			int end = m_picker->reverse_cursor();
-			if (index > start) update_sparse_piece_prio(index - 1, start, end);
-			if (index < end - 1) update_sparse_piece_prio(index + 1, start, end);
-		}
-
 #ifndef TORRENT_DISABLE_EXTENSIONS
 		for (extension_list_t::iterator i = m_extensions.begin()
 			, end(m_extensions.end()); i != end; ++i)
@@ -9817,26 +9788,6 @@ namespace libtorrent
 		if (m_need_suggest_pieces_refresh)
 			do_refresh_suggest_pieces();
 
-		m_time_scaler--;
-		if (m_time_scaler <= 0)
-		{
-			m_time_scaler = 10;
-
-			if (settings().get_int(settings_pack::max_sparse_regions) > 0
-				&& has_picker()
-				&& m_picker->sparse_regions() > settings().get_int(settings_pack::max_sparse_regions))
-			{
-				// we have too many sparse regions. Prioritize pieces
-				// that won't introduce new sparse regions
-				// prioritize pieces that will reduce the number of sparse
-				// regions even higher
-				int start = m_picker->cursor();
-				int end = m_picker->reverse_cursor();
-				for (int i = start; i < end; ++i)
-					update_sparse_piece_prio(i, start, end);
-			}
-		}
-
 		if (settings().get_bool(settings_pack::rate_limit_ip_overhead))
 		{
 			int up_limit = upload_limit();
@@ -11636,7 +11587,6 @@ namespace libtorrent
 		int num_pieces = m_torrent_file->num_pieces();
 		if (has_picker() && (flags & torrent_handle::query_pieces))
 		{
-			st->sparse_regions = m_picker->sparse_regions();
 			st->pieces.resize(num_pieces, false);
 			for (int i = 0; i < num_pieces; ++i)
 				if (m_picker->has_piece_passed(i)) st->pieces.set_bit(i);

src/torrent_handle.cpp

@@ -119,7 +119,6 @@ namespace libtorrent
 		, seeding_time(0)
 		, seed_rank(0)
 		, last_scrape(0)
-		, sparse_regions(0)
 		, priority(0)
 		, state(checking_resume_data)
 		, need_save_resume(false)