Add Local Version field to files, send index in segments.

cmd/syncthing/gui.go

@@ -180,7 +180,7 @@ func restGetModelVersion(m *model.Model, w http.ResponseWriter, r *http.Request)
 	var repo = qs.Get("repo")
 	var res = make(map[string]interface{})
 
-	res["version"] = m.Version(repo)
+	res["version"] = m.LocalVersion(repo)
 
 	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	json.NewEncoder(w).Encode(res)
@@ -210,7 +210,7 @@ func restGetModel(m *model.Model, w http.ResponseWriter, r *http.Request) {
 	res["inSyncFiles"], res["inSyncBytes"] = globalFiles-needFiles, globalBytes-needBytes
 
 	res["state"] = m.State(repo)
-	res["version"] = m.Version(repo)
+	res["version"] = m.LocalVersion(repo)
 
 	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	json.NewEncoder(w).Encode(res)

cmd/syncthing/main.go

@@ -290,11 +290,6 @@ func main() {
 		rateBucket = ratelimit.NewBucketWithRate(float64(1000*cfg.Options.MaxSendKbps), int64(5*1000*cfg.Options.MaxSendKbps))
 	}
 
-	havePersistentIndex := false
-	if fi, err := os.Stat(filepath.Join(confDir, "index")); err == nil && fi.IsDir() {
-		havePersistentIndex = true
-	}
-
 	db, err := leveldb.OpenFile(filepath.Join(confDir, "index"), nil)
 	if err != nil {
 		l.Fatalln("leveldb.OpenFile():", err)
@@ -364,11 +359,6 @@ nextRepo:
 	// Walk the repository and update the local model before establishing any
 	// connections to other nodes.
 
-	if !havePersistentIndex {
-		// There's no new style index, load old ones
-		l.Infoln("Loading legacy index files")
-		m.LoadIndexes(confDir)
-	}
 	m.CleanRepos()
 	l.Infoln("Performing initial repository scan")
 	m.ScanRepos()
@@ -645,9 +635,10 @@ next:
 				if rateBucket != nil {
 					wr = &limitedWriter{conn, rateBucket}
 				}
-				protoConn := protocol.NewConnection(remoteID, conn, wr, m)
+				name := fmt.Sprintf("%s-%s", conn.LocalAddr(), conn.RemoteAddr())
+				protoConn := protocol.NewConnection(remoteID, conn, wr, m, name)
 
-				l.Infof("Established secure connection to %s at %v", remoteID, conn.RemoteAddr())
+				l.Infof("Established secure connection to %s at %s", remoteID, name)
 				if debugNet {
 					l.Debugf("cipher suite %04X", conn.ConnectionState().CipherSuite)
 				}

files/leveldb.go

@@ -3,6 +3,7 @@ package files
 import (
 	"bytes"
 	"sort"
+	"sync"
 
 	"github.com/calmh/syncthing/lamport"
 	"github.com/calmh/syncthing/protocol"
@@ -12,6 +13,22 @@ import (
 	"github.com/syndtr/goleveldb/leveldb/util"
 )
 
+var (
+	clockTick uint64
+	clockMut  sync.Mutex
+)
+
+func clock(v uint64) uint64 {
+	clockMut.Lock()
+	defer clockMut.Unlock()
+	if v > clockTick {
+		clockTick = v + 1
+	} else {
+		clockTick++
+	}
+	return clockTick
+}
+
 const (
 	keyTypeNode = iota
 	keyTypeGlobal
@@ -91,11 +108,11 @@ func globalKeyName(key []byte) []byte {
 	return key[1+64:]
 }
 
-type deletionHandler func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) bool
+type deletionHandler func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) uint64
 
 type fileIterator func(f protocol.FileInfo) bool
 
-func ldbGenericReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo, deleteFn deletionHandler) bool {
+func ldbGenericReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo, deleteFn deletionHandler) uint64 {
 	sort.Sort(fileList(fs)) // sort list on name, same as on disk
 
 	start := nodeKey(repo, node, nil)                            // before all repo/node files
@@ -112,7 +129,7 @@ func ldbGenericReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo
 
 	moreDb := dbi.Next()
 	fsi := 0
-	changed := false
+	var maxLocalVer uint64
 
 	for {
 		var newName, oldName []byte
@@ -144,9 +161,10 @@ func ldbGenericReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo
 
 		switch {
 		case moreFs && (!moreDb || cmp == -1):
-			changed = true
 			// Disk is missing this file. Insert it.
-			ldbInsert(batch, repo, node, newName, fs[fsi])
+			if lv := ldbInsert(batch, repo, node, newName, fs[fsi]); lv > maxLocalVer {
+				maxLocalVer = lv
+			}
 			ldbUpdateGlobal(snap, batch, repo, node, newName, fs[fsi].Version)
 			fsi++
 
@@ -155,9 +173,10 @@ func ldbGenericReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo
 			var ef protocol.FileInfo
 			ef.UnmarshalXDR(dbi.Value())
 			if fs[fsi].Version > ef.Version {
-				ldbInsert(batch, repo, node, newName, fs[fsi])
+				if lv := ldbInsert(batch, repo, node, newName, fs[fsi]); lv > maxLocalVer {
+					maxLocalVer = lv
+				}
 				ldbUpdateGlobal(snap, batch, repo, node, newName, fs[fsi].Version)
-				changed = true
 			}
 			// Iterate both sides.
 			fsi++
@@ -165,8 +184,8 @@ func ldbGenericReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo
 
 		case moreDb && (!moreFs || cmp == 1):
 			if deleteFn != nil {
-				if deleteFn(snap, batch, repo, node, oldName, dbi) {
+				if lv := deleteFn(snap, batch, repo, node, oldName, dbi); lv > maxLocalVer {
-					changed = true
+					maxLocalVer = lv
 				}
 			}
 			moreDb = dbi.Next()
@@ -178,23 +197,24 @@ func ldbGenericReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo
 		panic(err)
 	}
 
-	return changed
+	return maxLocalVer
 }
 
-func ldbReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) bool {
+func ldbReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) uint64 {
-	return ldbGenericReplace(db, repo, node, fs, func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) bool {
+	// TODO: Return the remaining maxLocalVer?
+	return ldbGenericReplace(db, repo, node, fs, func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) uint64 {
 		// Disk has files that we are missing. Remove it.
 		if debug {
 			l.Debugf("delete; repo=%q node=%x name=%q", repo, node, name)
 		}
 		batch.Delete(dbi.Key())
 		ldbRemoveFromGlobal(db, batch, repo, node, name)
-		return true
+		return 0
 	})
 }
 
-func ldbReplaceWithDelete(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) bool {
+func ldbReplaceWithDelete(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) uint64 {
-	return ldbGenericReplace(db, repo, node, fs, func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) bool {
+	return ldbGenericReplace(db, repo, node, fs, func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) uint64 {
 		var f protocol.FileInfo
 		err := f.UnmarshalXDR(dbi.Value())
 		if err != nil {
@@ -204,18 +224,20 @@ func ldbReplaceWithDelete(db *leveldb.DB, repo, node []byte, fs []protocol.FileI
 			if debug {
 				l.Debugf("mark deleted; repo=%q node=%x name=%q", repo, node, name)
 			}
+			ts := clock(f.LocalVersion)
 			f.Blocks = nil
 			f.Version = lamport.Default.Tick(f.Version)
 			f.Flags |= protocol.FlagDeleted
+			f.LocalVersion = ts
 			batch.Put(dbi.Key(), f.MarshalXDR())
 			ldbUpdateGlobal(db, batch, repo, node, nodeKeyName(dbi.Key()), f.Version)
-			return true
+			return ts
 		}
-		return false
+		return 0
 	})
 }
 
-func ldbUpdate(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) bool {
+func ldbUpdate(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) uint64 {
 	batch := new(leveldb.Batch)
 	snap, err := db.GetSnapshot()
 	if err != nil {
@@ -223,12 +245,15 @@ func ldbUpdate(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) bool {
 	}
 	defer snap.Release()
 
+	var maxLocalVer uint64
 	for _, f := range fs {
 		name := []byte(f.Name)
 		fk := nodeKey(repo, node, name)
 		bs, err := snap.Get(fk, nil)
 		if err == leveldb.ErrNotFound {
-			ldbInsert(batch, repo, node, name, f)
+			if lv := ldbInsert(batch, repo, node, name, f); lv > maxLocalVer {
+				maxLocalVer = lv
+			}
 			ldbUpdateGlobal(snap, batch, repo, node, name, f.Version)
 			continue
 		}
@@ -239,7 +264,9 @@ func ldbUpdate(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) bool {
 			panic(err)
 		}
 		if ef.Version != f.Version {
-			ldbInsert(batch, repo, node, name, f)
+			if lv := ldbInsert(batch, repo, node, name, f); lv > maxLocalVer {
+				maxLocalVer = lv
+			}
 			ldbUpdateGlobal(snap, batch, repo, node, name, f.Version)
 		}
 	}
@@ -249,16 +276,22 @@ func ldbUpdate(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) bool {
 		panic(err)
 	}
 
-	return true
+	return maxLocalVer
 }
 
-func ldbInsert(batch dbWriter, repo, node, name []byte, file protocol.FileInfo) {
+func ldbInsert(batch dbWriter, repo, node, name []byte, file protocol.FileInfo) uint64 {
 	if debug {
 		l.Debugf("insert; repo=%q node=%x %v", repo, node, file)
 	}
 
+	if file.LocalVersion == 0 {
+		file.LocalVersion = clock(0)
+	}
+
 	nk := nodeKey(repo, node, name)
 	batch.Put(nk, file.MarshalXDR())
+
+	return file.LocalVersion
 }
 
 // ldbUpdateGlobal adds this node+version to the version list for the given

files/set.go

@@ -21,18 +21,29 @@ type fileRecord struct {
 type bitset uint64
 
 type Set struct {
-	changes map[protocol.NodeID]uint64
+	localVersion map[protocol.NodeID]uint64
-	mutex   sync.Mutex
+	mutex        sync.Mutex
-	repo    string
+	repo         string
-	db      *leveldb.DB
+	db           *leveldb.DB
 }
 
 func NewSet(repo string, db *leveldb.DB) *Set {
 	var s = Set{
-		changes: make(map[protocol.NodeID]uint64),
+		localVersion: make(map[protocol.NodeID]uint64),
-		repo:    repo,
+		repo:         repo,
-		db:      db,
+		db:           db,
 	}
+
+	var lv uint64
+	ldbWithHave(db, []byte(repo), protocol.LocalNodeID[:], func(f protocol.FileInfo) bool {
+		if f.LocalVersion > lv {
+			lv = f.LocalVersion
+		}
+		return true
+	})
+	s.localVersion[protocol.LocalNodeID] = lv
+	clock(lv)
+
 	return &s
 }
 
@@ -42,8 +53,8 @@ func (s *Set) Replace(node protocol.NodeID, fs []protocol.FileInfo) {
 	}
 	s.mutex.Lock()
 	defer s.mutex.Unlock()
-	if ldbReplace(s.db, []byte(s.repo), node[:], fs) {
+	if lv := ldbReplace(s.db, []byte(s.repo), node[:], fs); lv > s.localVersion[node] {
-		s.changes[node]++
+		s.localVersion[node] = lv
 	}
 }
 
@@ -53,8 +64,8 @@ func (s *Set) ReplaceWithDelete(node protocol.NodeID, fs []protocol.FileInfo) {
 	}
 	s.mutex.Lock()
 	defer s.mutex.Unlock()
-	if ldbReplaceWithDelete(s.db, []byte(s.repo), node[:], fs) {
+	if lv := ldbReplaceWithDelete(s.db, []byte(s.repo), node[:], fs); lv > s.localVersion[node] {
-		s.changes[node]++
+		s.localVersion[node] = lv
 	}
 }
 
@@ -64,8 +75,8 @@ func (s *Set) Update(node protocol.NodeID, fs []protocol.FileInfo) {
 	}
 	s.mutex.Lock()
 	defer s.mutex.Unlock()
-	if ldbUpdate(s.db, []byte(s.repo), node[:], fs) {
+	if lv := ldbUpdate(s.db, []byte(s.repo), node[:], fs); lv > s.localVersion[node] {
-		s.changes[node]++
+		s.localVersion[node] = lv
 	}
 }
 
@@ -102,8 +113,8 @@ func (s *Set) Availability(file string) []protocol.NodeID {
 	return ldbAvailability(s.db, []byte(s.repo), []byte(file))
 }
 
-func (s *Set) Changes(node protocol.NodeID) uint64 {
+func (s *Set) LocalVersion(node protocol.NodeID) uint64 {
 	s.mutex.Lock()
 	defer s.mutex.Unlock()
-	return s.changes[node]
+	return s.localVersion[node]
 }

files/set_test.go

@@ -554,7 +554,7 @@ func TestNeed(t *testing.T) {
 	}
 }
 
-func TestChanges(t *testing.T) {
+func TestLocalVersion(t *testing.T) {
 	db, err := leveldb.Open(storage.NewMemStorage(), nil)
 	if err != nil {
 		t.Fatal(err)
@@ -578,17 +578,17 @@ func TestChanges(t *testing.T) {
 	}
 
 	m.ReplaceWithDelete(protocol.LocalNodeID, local1)
-	c0 := m.Changes(protocol.LocalNodeID)
+	c0 := m.LocalVersion(protocol.LocalNodeID)
 
 	m.ReplaceWithDelete(protocol.LocalNodeID, local2)
-	c1 := m.Changes(protocol.LocalNodeID)
+	c1 := m.LocalVersion(protocol.LocalNodeID)
 	if !(c1 > c0) {
-		t.Fatal("Change number should have incremented")
+		t.Fatal("Local version number should have incremented")
 	}
 
 	m.ReplaceWithDelete(protocol.LocalNodeID, local2)
-	c2 := m.Changes(protocol.LocalNodeID)
+	c2 := m.LocalVersion(protocol.LocalNodeID)
 	if c2 != c1 {
-		t.Fatal("Change number should be unchanged")
+		t.Fatal("Local version number should be unchanged")
 	}
 }

files/sort.go

@@ -1,8 +1,8 @@
 package files
 
 import (
-	"sort"
 	"github.com/calmh/syncthing/protocol"
+	"sort"
 )
 
 type SortBy func(p protocol.FileInfo) int

integration/test-delupd.sh

@@ -112,6 +112,9 @@ alterFiles() {
 	done
 
 	pkill -CONT syncthing
+
+	echo "Restarting instance 2"
+	curl -HX-API-Key:abc123 -X POST "http://localhost:8082/rest/restart"
 }
 
 rm -rf h?/*.idx.gz h?/index

luhn/luhn.go

@@ -17,8 +17,8 @@ var (
 // Generate returns a check digit for the string s, which should be composed
 // of characters from the Alphabet a.
 func (a Alphabet) Generate(s string) (rune, error) {
-	if err:=a.check();err!=nil{
+	if err := a.check(); err != nil {
-		return 0,err
+		return 0, err
 	}
 
 	factor := 1

model/model.go

@@ -5,8 +5,6 @@
 package model
 
 import (
-	"compress/gzip"
-	"crypto/sha1"
 	"errors"
 	"fmt"
 	"io"
@@ -21,7 +19,6 @@ import (
 	"github.com/calmh/syncthing/events"
 	"github.com/calmh/syncthing/files"
 	"github.com/calmh/syncthing/lamport"
-	"github.com/calmh/syncthing/osutil"
 	"github.com/calmh/syncthing/protocol"
 	"github.com/calmh/syncthing/scanner"
 	"github.com/syndtr/goleveldb/leveldb"
@@ -42,6 +39,9 @@ const (
 // transfer to bring the systems into synchronization.
 const zeroEntrySize = 128
 
+// How many files to send in each Index/IndexUpdate message.
+const indexBatchSize = 1000
+
 type Model struct {
 	indexDir string
 	cfg      *config.Configuration
@@ -65,6 +65,9 @@ type Model struct {
 	nodeVer   map[protocol.NodeID]string
 	pmut      sync.RWMutex // protects protoConn and rawConn
 
+	sentLocalVer map[protocol.NodeID]map[string]uint64
+	slMut        sync.Mutex
+
 	sup suppressor
 
 	addedRepo bool
@@ -95,6 +98,7 @@ func NewModel(indexDir string, cfg *config.Configuration, clientName, clientVers
 		protoConn:     make(map[protocol.NodeID]protocol.Connection),
 		rawConn:       make(map[protocol.NodeID]io.Closer),
 		nodeVer:       make(map[protocol.NodeID]string),
+		sentLocalVer:  make(map[protocol.NodeID]map[string]uint64),
 		sup:           suppressor{threshold: int64(cfg.Options.MaxChangeKbps)},
 	}
 
@@ -108,7 +112,6 @@ func NewModel(indexDir string, cfg *config.Configuration, clientName, clientVers
 	deadlockDetect(&m.rmut, time.Duration(timeout)*time.Second)
 	deadlockDetect(&m.smut, time.Duration(timeout)*time.Second)
 	deadlockDetect(&m.pmut, time.Duration(timeout)*time.Second)
-	go m.broadcastIndexLoop()
 	return m
 }
 
@@ -392,13 +395,13 @@ func (m *Model) Close(node protocol.NodeID, err error) {
 		"error": err.Error(),
 	})
 
+	m.pmut.Lock()
 	m.rmut.RLock()
 	for _, repo := range m.nodeRepos[node] {
 		m.repoFiles[repo].Replace(node, nil)
 	}
 	m.rmut.RUnlock()
 
-	m.pmut.Lock()
 	conn, ok := m.rawConn[node]
 	if ok {
 		conn.Close()
@@ -502,6 +505,7 @@ func (m *Model) ConnectedTo(nodeID protocol.NodeID) bool {
 // repository changes.
 func (m *Model) AddConnection(rawConn io.Closer, protoConn protocol.Connection) {
 	nodeID := protoConn.ID()
+
 	m.pmut.Lock()
 	if _, ok := m.protoConn[nodeID]; ok {
 		panic("add existing node")
@@ -511,48 +515,99 @@ func (m *Model) AddConnection(rawConn io.Closer, protoConn protocol.Connection)
 		panic("add existing node")
 	}
 	m.rawConn[nodeID] = rawConn
-	m.pmut.Unlock()
 
 	cm := m.clusterConfig(nodeID)
 	protoConn.ClusterConfig(cm)
 
-	var idxToSend = make(map[string][]protocol.FileInfo)
-
 	m.rmut.RLock()
 	for _, repo := range m.nodeRepos[nodeID] {
-		idxToSend[repo] = m.protocolIndex(repo)
+		fs := m.repoFiles[repo]
+		go sendIndexes(protoConn, repo, fs)
 	}
 	m.rmut.RUnlock()
-
+	m.pmut.Unlock()
-	go func() {
-		for repo, idx := range idxToSend {
-			if debug {
-				l.Debugf("IDX(out/initial): %s: %q: %d files", nodeID, repo, len(idx))
-			}
-			const batchSize = 1000
-			for i := 0; i < len(idx); i += batchSize {
-				if len(idx[i:]) < batchSize {
-					protoConn.Index(repo, idx[i:])
-				} else {
-					protoConn.Index(repo, idx[i:i+batchSize])
-				}
-			}
-		}
-	}()
 }
 
-// protocolIndex returns the current local index in protocol data types.
+func sendIndexes(conn protocol.Connection, repo string, fs *files.Set) {
-func (m *Model) protocolIndex(repo string) []protocol.FileInfo {
+	nodeID := conn.ID()
-	var fs []protocol.FileInfo
+	name := conn.Name()
-	m.repoFiles[repo].WithHave(protocol.LocalNodeID, func(f protocol.FileInfo) bool {
-		fs = append(fs, f)
-		return true
-	})
 
-	return fs
+	if debug {
+		l.Debugf("sendIndexes for %s-%s@/%q starting", nodeID, name, repo)
+	}
+
+	initial := true
+	minLocalVer := uint64(0)
+	var err error
+
+	defer func() {
+		if debug {
+			l.Debugf("sendIndexes for %s-%s@/%q exiting: %v", nodeID, name, repo, err)
+		}
+	}()
+
+	for err == nil {
+		if !initial && fs.LocalVersion(protocol.LocalNodeID) <= minLocalVer {
+			time.Sleep(1 * time.Second)
+			continue
+		}
+
+		batch := make([]protocol.FileInfo, 0, indexBatchSize)
+		maxLocalVer := uint64(0)
+
+		fs.WithHave(protocol.LocalNodeID, func(f protocol.FileInfo) bool {
+			if f.LocalVersion <= minLocalVer {
+				return true
+			}
+
+			if f.LocalVersion > maxLocalVer {
+				maxLocalVer = f.LocalVersion
+			}
+
+			if len(batch) == indexBatchSize {
+				if initial {
+					if err = conn.Index(repo, batch); err != nil {
+						return false
+					}
+					if debug {
+						l.Debugf("sendIndexes for %s-%s/%q: %d files (initial index)", nodeID, name, repo, len(batch))
+					}
+					initial = false
+				} else {
+					if err = conn.IndexUpdate(repo, batch); err != nil {
+						return false
+					}
+					if debug {
+						l.Debugf("sendIndexes for %s-%s/%q: %d files (batched update)", nodeID, name, repo, len(batch))
+					}
+				}
+
+				batch = make([]protocol.FileInfo, 0, indexBatchSize)
+			}
+
+			batch = append(batch, f)
+			return true
+		})
+
+		if initial {
+			err = conn.Index(repo, batch)
+			if debug && err == nil {
+				l.Debugf("sendIndexes for %s-%s/%q: %d files (small initial index)", nodeID, name, repo, len(batch))
+			}
+			initial = false
+		} else if len(batch) > 0 {
+			err = conn.IndexUpdate(repo, batch)
+			if debug && err == nil {
+				l.Debugf("sendIndexes for %s-%s/%q: %d files (last batch)", nodeID, name, repo, len(batch))
+			}
+		}
+
+		minLocalVer = maxLocalVer
+	}
 }
 
 func (m *Model) updateLocal(repo string, f protocol.FileInfo) {
+	f.LocalVersion = 0
 	m.rmut.RLock()
 	m.repoFiles[repo].Update(protocol.LocalNodeID, []protocol.FileInfo{f})
 	m.rmut.RUnlock()
@@ -575,49 +630,6 @@ func (m *Model) requestGlobal(nodeID protocol.NodeID, repo, name string, offset
 	return nc.Request(repo, name, offset, size)
 }
 
-func (m *Model) broadcastIndexLoop() {
-	// TODO: Rewrite to send index in segments
-	var lastChange = map[string]uint64{}
-	for {
-		time.Sleep(5 * time.Second)
-
-		m.pmut.RLock()
-		m.rmut.RLock()
-
-		var indexWg sync.WaitGroup
-		for repo, fs := range m.repoFiles {
-			repo := repo
-
-			c := fs.Changes(protocol.LocalNodeID)
-			if c == lastChange[repo] {
-				continue
-			}
-			lastChange[repo] = c
-
-			idx := m.protocolIndex(repo)
-
-			for _, nodeID := range m.repoNodes[repo] {
-				nodeID := nodeID
-				if conn, ok := m.protoConn[nodeID]; ok {
-					indexWg.Add(1)
-					if debug {
-						l.Debugf("IDX(out/loop): %s: %d files", nodeID, len(idx))
-					}
-					go func() {
-						conn.Index(repo, idx)
-						indexWg.Done()
-					}()
-				}
-			}
-		}
-
-		m.rmut.RUnlock()
-		m.pmut.RUnlock()
-
-		indexWg.Wait()
-	}
-}
-
 func (m *Model) AddRepo(cfg config.RepositoryConfiguration) {
 	if m.started {
 		panic("cannot add repo to started model")
@@ -709,88 +721,6 @@ func (m *Model) ScanRepo(repo string) error {
 	return nil
 }
 
-func (m *Model) LoadIndexes(dir string) {
-	m.rmut.RLock()
-	for repo := range m.repoCfgs {
-		fs := m.loadIndex(repo, dir)
-
-		var sfs = make([]protocol.FileInfo, len(fs))
-		for i := 0; i < len(fs); i++ {
-			lamport.Default.Tick(fs[i].Version)
-			fs[i].Flags &= ^uint32(protocol.FlagInvalid) // we might have saved an index with files that were suppressed; the should not be on startup
-		}
-
-		m.repoFiles[repo].Replace(protocol.LocalNodeID, sfs)
-	}
-	m.rmut.RUnlock()
-}
-
-func (m *Model) saveIndex(repo string, dir string, fs []protocol.FileInfo) error {
-	id := fmt.Sprintf("%x", sha1.Sum([]byte(m.repoCfgs[repo].Directory)))
-	name := id + ".idx.gz"
-	name = filepath.Join(dir, name)
-	tmp := fmt.Sprintf("%s.tmp.%d", name, time.Now().UnixNano())
-	idxf, err := os.OpenFile(tmp, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0644)
-	if err != nil {
-		return err
-	}
-	defer os.Remove(tmp)
-
-	gzw := gzip.NewWriter(idxf)
-
-	n, err := protocol.IndexMessage{
-		Repository: repo,
-		Files:      fs,
-	}.EncodeXDR(gzw)
-	if err != nil {
-		gzw.Close()
-		idxf.Close()
-		return err
-	}
-
-	err = gzw.Close()
-	if err != nil {
-		return err
-	}
-
-	err = idxf.Close()
-	if err != nil {
-		return err
-	}
-
-	if debug {
-		l.Debugln("wrote index,", n, "bytes uncompressed")
-	}
-
-	return osutil.Rename(tmp, name)
-}
-
-func (m *Model) loadIndex(repo string, dir string) []protocol.FileInfo {
-	id := fmt.Sprintf("%x", sha1.Sum([]byte(m.repoCfgs[repo].Directory)))
-	name := id + ".idx.gz"
-	name = filepath.Join(dir, name)
-
-	idxf, err := os.Open(name)
-	if err != nil {
-		return nil
-	}
-	defer idxf.Close()
-
-	gzr, err := gzip.NewReader(idxf)
-	if err != nil {
-		return nil
-	}
-	defer gzr.Close()
-
-	var im protocol.IndexMessage
-	err = im.DecodeXDR(gzr)
-	if err != nil || im.Repository != repo {
-		return nil
-	}
-
-	return im.Files
-}
-
 // clusterConfig returns a ClusterConfigMessage that is correct for the given peer node
 func (m *Model) clusterConfig(node protocol.NodeID) protocol.ClusterConfigMessage {
 	cm := protocol.ClusterConfigMessage{
@@ -868,12 +798,12 @@ func (m *Model) Override(repo string) {
 // Version returns the change version for the given repository. This is
 // guaranteed to increment if the contents of the local or global repository
 // has changed.
-func (m *Model) Version(repo string) uint64 {
+func (m *Model) LocalVersion(repo string) uint64 {
 	var ver uint64
 
 	m.rmut.Lock()
 	for _, n := range m.repoNodes[repo] {
-		ver += m.repoFiles[repo].Changes(n)
+		ver += m.repoFiles[repo].LocalVersion(n)
 	}
 	m.rmut.Unlock()
 

model/puller.go

@@ -193,7 +193,7 @@ func (p *puller) run() {
 		default:
 		}
 
-		if v := p.model.Version(p.repoCfg.ID); v > prevVer {
+		if v := p.model.LocalVersion(p.repoCfg.ID); v > prevVer {
 			// Queue more blocks to fetch, if any
 			p.queueNeededBlocks()
 			prevVer = v
@@ -335,15 +335,21 @@ func (p *puller) handleRequestResult(res requestResult) {
 		return
 	}
 
-	_, of.err = of.file.WriteAt(res.data, res.offset)
+	if res.err != nil {
+		of.err = res.err
+		if debug {
+			l.Debugf("pull: not writing %q / %q offset %d: %v", p.repoCfg.ID, f.Name, res.offset, res.err)
+		}
+	} else {
+		_, of.err = of.file.WriteAt(res.data, res.offset)
+		if debug {
+			l.Debugf("pull: wrote %q / %q offset %d len %d outstanding %d done %v", p.repoCfg.ID, f.Name, res.offset, len(res.data), of.outstanding, of.done)
+		}
+	}
 
 	of.outstanding--
 	p.openFiles[f.Name] = of
 
-	if debug {
-		l.Debugf("pull: wrote %q / %q offset %d outstanding %d done %v", p.repoCfg.ID, f.Name, res.offset, of.outstanding, of.done)
-	}
-
 	if of.done && of.outstanding == 0 {
 		p.closeFile(f)
 	}
@@ -526,7 +532,7 @@ func (p *puller) handleRequestBlock(b bqBlock) bool {
 	}
 
 	node := p.oustandingPerNode.leastBusyNode(of.availability)
-	if len(node) == 0 {
+	if node == (protocol.NodeID{}) {
 		of.err = errNoNode
 		if of.file != nil {
 			of.file.Close()
@@ -662,7 +668,7 @@ func (p *puller) closeFile(f protocol.FileInfo) {
 
 	for i := range hb {
 		if bytes.Compare(hb[i].Hash, f.Blocks[i].Hash) != 0 {
-			l.Debugf("pull: %q / %q: block %d hash mismatch", p.repoCfg.ID, f.Name, i)
+			l.Debugf("pull: %q / %q: block %d hash mismatch\n\thave: %x\n\twant: %x", p.repoCfg.ID, f.Name, i, hb[i].Hash, f.Blocks[i].Hash)
 			return
 		}
 	}

protocol/PROTOCOL.md

@@ -182,7 +182,7 @@ Cluster Config messages MUST NOT be sent after the initial exchange.
     |                             Flags                             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                                                               |
-    +                     Max Version (64 bits)                     +
+    +                  Max Local Version (64 bits)                  +
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
@@ -255,13 +255,13 @@ The Node Flags field contains the following single bit flags:
 
 Exactly one of the T, R or S bits MUST be set.
 
-The Node Max Version field contains the highest file version number of
+The Node Max Local Version field contains the highest local file version
-the files already known to be in the index sent by this node. If nothing
+number of the files already known to be in the index sent by this node.
-is known about the index of a given node, this field MUST be set to
+If nothing is known about the index of a given node, this field MUST be
-zero. When receiving a Cluster Config message with a non-zero Max
+set to zero. When receiving a Cluster Config message with a non-zero Max
 Version for the local node ID, a node MAY elect to send an Index Update
-message containing only files with higher version numbers in place of
+message containing only files with higher local version numbers in place
-the initial Index message.
+of the initial Index message.
 
 The Options field contain option values to be used in an implementation
 specific manner. The options list is conceptually a map of Key => Value
@@ -292,7 +292,7 @@ peers acting in a specific manner as a result of sent options.
     struct Node {
         string ID<>;
         unsigned int Flags;
-        unsigned hyper MaxVersion;
+        unsigned hyper MaxLocalVersion;
     }
 
     struct Option {
@@ -359,6 +359,10 @@ Index message MUST be sent. There is no response to the Index message.
     +                       Version (64 bits)                       +
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                                                               |
+    +                    Local Version (64 bits)                    +
+    |                                                               |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                       Number of Blocks                        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     /                                                               /
@@ -400,6 +404,10 @@ detected and received change. The combination of Repository, Name and
 Version uniquely identifies the contents of a file at a given point in
 time.
 
+The Local Version field is the value of a node local monotonic clock at
+the time of last local database update to a file. The clock ticks on
+every local database update.
+
 The Flags field is made up of the following single bit flags:
 
      0                   1                   2                   3
@@ -458,6 +466,7 @@ block which may represent a smaller amount of data.
         unsigned int Flags;
         hyper Modified;
         unsigned hyper Version;
+        unsigned hyper LocalVer;
         BlockInfo Blocks<>;
     }
 

protocol/message.go

@@ -12,11 +12,12 @@ type IndexMessage struct {
 }
 
 type FileInfo struct {
-	Name     string // max:1024
+	Name         string // max:1024
-	Flags    uint32
+	Flags        uint32
-	Modified int64
+	Modified     int64
-	Version  uint64
+	Version      uint64
-	Blocks   []BlockInfo // max:1000000
+	LocalVersion uint64
+	Blocks       []BlockInfo // max:1000000
 }
 
 func (f FileInfo) String() string {
@@ -69,9 +70,9 @@ type Repository struct {
 }
 
 type Node struct {
-	ID         []byte // max:32
+	ID              []byte // max:32
-	Flags      uint32
+	Flags           uint32
-	MaxVersion uint64
+	MaxLocalVersion uint64
 }
 
 type Option struct {

protocol/message_xdr.go

@@ -121,6 +121,10 @@ FileInfo Structure:
 +                       Version (64 bits)                       +
 |                                                               |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                                                               |
++                    Local Version (64 bits)                    +
+|                                                               |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                       Number of Blocks                        |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 /                                                               /
@@ -134,6 +138,7 @@ struct FileInfo {
 	unsigned int Flags;
 	hyper Modified;
 	unsigned hyper Version;
+	unsigned hyper LocalVersion;
 	BlockInfo Blocks<1000000>;
 }
 
@@ -163,6 +168,7 @@ func (o FileInfo) encodeXDR(xw *xdr.Writer) (int, error) {
 	xw.WriteUint32(o.Flags)
 	xw.WriteUint64(uint64(o.Modified))
 	xw.WriteUint64(o.Version)
+	xw.WriteUint64(o.LocalVersion)
 	if len(o.Blocks) > 1000000 {
 		return xw.Tot(), xdr.ErrElementSizeExceeded
 	}
@@ -189,6 +195,7 @@ func (o *FileInfo) decodeXDR(xr *xdr.Reader) error {
 	o.Flags = xr.ReadUint32()
 	o.Modified = int64(xr.ReadUint64())
 	o.Version = xr.ReadUint64()
+	o.LocalVersion = xr.ReadUint64()
 	_BlocksSize := int(xr.ReadUint32())
 	if _BlocksSize > 1000000 {
 		return xdr.ErrElementSizeExceeded
@@ -567,7 +574,7 @@ Node Structure:
 |                             Flags                             |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                                                               |
-+                     Max Version (64 bits)                     +
++                  Max Local Version (64 bits)                  +
 |                                                               |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
@@ -575,7 +582,7 @@ Node Structure:
 struct Node {
 	opaque ID<32>;
 	unsigned int Flags;
-	unsigned hyper MaxVersion;
+	unsigned hyper MaxLocalVersion;
 }
 
 */
@@ -602,7 +609,7 @@ func (o Node) encodeXDR(xw *xdr.Writer) (int, error) {
 	}
 	xw.WriteBytes(o.ID)
 	xw.WriteUint32(o.Flags)
-	xw.WriteUint64(o.MaxVersion)
+	xw.WriteUint64(o.MaxLocalVersion)
 	return xw.Tot(), xw.Error()
 }
 
@@ -620,7 +627,7 @@ func (o *Node) UnmarshalXDR(bs []byte) error {
 func (o *Node) decodeXDR(xr *xdr.Reader) error {
 	o.ID = xr.ReadBytesMax(32)
 	o.Flags = xr.ReadUint32()
-	o.MaxVersion = xr.ReadUint64()
+	o.MaxLocalVersion = xr.ReadUint64()
 	return xr.Error()
 }
 

protocol/protocol.go

@@ -66,7 +66,9 @@ type Model interface {
 
 type Connection interface {
 	ID() NodeID
-	Index(repo string, files []FileInfo)
+	Name() string
+	Index(repo string, files []FileInfo) error
+	IndexUpdate(repo string, files []FileInfo) error
 	Request(repo string, name string, offset int64, size int) ([]byte, error)
 	ClusterConfig(config ClusterConfigMessage)
 	Statistics() Statistics
@@ -74,6 +76,7 @@ type Connection interface {
 
 type rawConnection struct {
 	id       NodeID
+	name     string
 	receiver Model
 	state    int
 
@@ -87,8 +90,7 @@ type rawConnection struct {
 	awaiting    []chan asyncResult
 	awaitingMut sync.Mutex
 
-	idxSent map[string]map[string]uint64
+	idxMut sync.Mutex // ensures serialization of Index calls
-	idxMut  sync.Mutex // ensures serialization of Index calls
 
 	nextID chan int
 	outbox chan []encodable
@@ -106,15 +108,16 @@ const (
 	pingIdleTime = 60 * time.Second
 )
 
-func NewConnection(nodeID NodeID, reader io.Reader, writer io.Writer, receiver Model) Connection {
+func NewConnection(nodeID NodeID, reader io.Reader, writer io.Writer, receiver Model, name string) Connection {
 	cr := &countingReader{Reader: reader}
 	cw := &countingWriter{Writer: writer}
 
 	rb := bufio.NewReader(cr)
-	wb := bufio.NewWriter(cw)
+	wb := bufio.NewWriterSize(cw, 65536)
 
 	c := rawConnection{
 		id:       nodeID,
+		name:     name,
 		receiver: nativeModel{receiver},
 		state:    stateInitial,
 		cr:       cr,
@@ -123,7 +126,6 @@ func NewConnection(nodeID NodeID, reader io.Reader, writer io.Writer, receiver M
 		wb:       wb,
 		xw:       xdr.NewWriter(wb),
 		awaiting: make([]chan asyncResult, 0x1000),
-		idxSent:  make(map[string]map[string]uint64),
 		outbox:   make(chan []encodable),
 		nextID:   make(chan int),
 		closed:   make(chan struct{}),
@@ -142,36 +144,34 @@ func (c *rawConnection) ID() NodeID {
 	return c.id
 }
 
+func (c *rawConnection) Name() string {
+	return c.name
+}
+
 // Index writes the list of file information to the connected peer node
-func (c *rawConnection) Index(repo string, idx []FileInfo) {
+func (c *rawConnection) Index(repo string, idx []FileInfo) error {
+	select {
+	case <-c.closed:
+		return ErrClosed
+	default:
+	}
 	c.idxMut.Lock()
-	defer c.idxMut.Unlock()
+	c.send(header{0, -1, messageTypeIndex}, IndexMessage{repo, idx})
+	c.idxMut.Unlock()
+	return nil
+}
 
-	var msgType int
+// IndexUpdate writes the list of file information to the connected peer node as an update
-	if c.idxSent[repo] == nil {
+func (c *rawConnection) IndexUpdate(repo string, idx []FileInfo) error {
-		// This is the first time we send an index.
+	select {
-		msgType = messageTypeIndex
+	case <-c.closed:
-
+		return ErrClosed
-		c.idxSent[repo] = make(map[string]uint64)
+	default:
-		for _, f := range idx {
-			c.idxSent[repo][f.Name] = f.Version
-		}
-	} else {
-		// We have sent one full index. Only send updates now.
-		msgType = messageTypeIndexUpdate
-		var diff []FileInfo
-		for _, f := range idx {
-			if vs, ok := c.idxSent[repo][f.Name]; !ok || f.Version != vs {
-				diff = append(diff, f)
-				c.idxSent[repo][f.Name] = f.Version
-			}
-		}
-		idx = diff
-	}
-
-	if msgType == messageTypeIndex || len(idx) > 0 {
-		c.send(header{0, -1, msgType}, IndexMessage{repo, idx})
 	}
+	c.idxMut.Lock()
+	c.send(header{0, -1, messageTypeIndexUpdate}, IndexMessage{repo, idx})
+	c.idxMut.Unlock()
+	return nil
 }
 
 // Request returns the bytes for the specified block after fetching them from the connected peer.
@@ -445,15 +445,13 @@ func (c *rawConnection) send(h header, es ...encodable) bool {
 }
 
 func (c *rawConnection) writerLoop() {
-	var err error
 	for {
 		select {
 		case es := <-c.outbox:
 			for _, e := range es {
 				e.encodeXDR(c.xw)
 			}
-
+			if err := c.flush(); err != nil {
-			if err = c.flush(); err != nil {
 				c.close(err)
 				return
 			}
@@ -471,11 +469,9 @@ func (c *rawConnection) flush() error {
 	if err := c.xw.Error(); err != nil {
 		return err
 	}
-
 	if err := c.wb.Flush(); err != nil {
 		return err
 	}
-
 	return nil
 }
 

protocol/wireformat.go

@@ -18,7 +18,11 @@ func (c wireFormatConnection) ID() NodeID {
 	return c.next.ID()
 }
 
-func (c wireFormatConnection) Index(repo string, fs []FileInfo) {
+func (c wireFormatConnection) Name() string {
+	return c.next.Name()
+}
+
+func (c wireFormatConnection) Index(repo string, fs []FileInfo) error {
 	var myFs = make([]FileInfo, len(fs))
 	copy(myFs, fs)
 
@@ -26,7 +30,18 @@ func (c wireFormatConnection) Index(repo string, fs []FileInfo) {
 		myFs[i].Name = norm.NFC.String(filepath.ToSlash(myFs[i].Name))
 	}
 
-	c.next.Index(repo, myFs)
+	return c.next.Index(repo, myFs)
+}
+
+func (c wireFormatConnection) IndexUpdate(repo string, fs []FileInfo) error {
+	var myFs = make([]FileInfo, len(fs))
+	copy(myFs, fs)
+
+	for i := range fs {
+		myFs[i].Name = norm.NFC.String(filepath.ToSlash(myFs[i].Name))
+	}
+
+	return c.next.IndexUpdate(repo, myFs)
 }
 
 func (c wireFormatConnection) Request(repo, name string, offset int64, size int) ([]byte, error) {

scanner/walk.go

@@ -6,6 +6,7 @@ package scanner
 
 import (
 	"bytes"
+	"code.google.com/p/go.text/unicode/norm"
 	"errors"
 	"fmt"
 	"io/ioutil"
@@ -14,7 +15,6 @@ import (
 	"runtime"
 	"strings"
 	"time"
-	"code.google.com/p/go.text/unicode/norm"
 
 	"github.com/calmh/syncthing/lamport"
 	"github.com/calmh/syncthing/protocol"
@@ -216,6 +216,7 @@ func (w *Walker) walkAndHashFiles(res *[]protocol.FileInfo, ign map[string][]str
 						l.Infof("Changes to %q are being temporarily suppressed because it changes too frequently.", p)
 						cf.Flags |= protocol.FlagInvalid
 						cf.Version = lamport.Default.Tick(cf.Version)
+						cf.LocalVersion = 0
 						if debug {
 							l.Debugln("suppressed:", cf)
 						}