chore: remove weak hashing which does not pull its weight (#10005)

We've had weak/rolling hashing in the code for quite a while. It was a popular request for a while, based on the belief that rsync does this and we should too. However, the benefit is quite small; we save on average about 0.8% of transferred blocks over the population as a whole: <img width="974" alt="Screenshot 2025-03-28 at 17 09 02" src="https://github.com/user-attachments/assets/bbe10dea-f85e-4043-9823-7cef1220b4a2" /> This would be fine if the cost was comparably low, however the downside of attempting rolling hash matching is that we (by default) do a complete file read on the destination in order to look for matches before we starting pulling blocks for the file. For any larger file this means a sometimes long, I/O-intensive pause before the file starts syncing, for usually no benefit. I propose we simply rip off the bandaid and save the effort.
2025-12-23 22:18:14 -05:00 · 2025-03-29 12:21:10 +00:00
parent 1a25ae32ca
commit b1c8f88a44
38 changed files with 288 additions and 1030 deletions
--- a/cmd/dev/stfileinfo/main.go
+++ b/cmd/dev/stfileinfo/main.go
@@ -72,7 +72,7 @@ func main() {
 		if *standardBlocks || blockSize < protocol.MinBlockSize {
 			blockSize = protocol.BlockSize(fi.Size())
 		}
-		bs, err := scanner.Blocks(context.TODO(), fd, blockSize, fi.Size(), nil, true)
+		bs, err := scanner.Blocks(context.TODO(), fd, blockSize, fi.Size(), nil)
 		if err != nil {
 			log.Fatal(err)
 		}
--- a/cmd/syncthing/decrypt/decrypt.go
+++ b/cmd/syncthing/decrypt/decrypt.go
@@ -238,7 +238,7 @@ func (c *CLI) decryptFile(encFi *protocol.FileInfo, plainFi *protocol.FileInfo,
 		}

 		// Verify the hash against the plaintext block info
-		if !scanner.Validate(dec, plainBlock.Hash, 0) {
+		if !scanner.Validate(dec, plainBlock.Hash) {
 			// The block decrypted correctly but fails the hash check. This
 			// is odd and unexpected, but it it's still a valid block from
 			// the source. The file might have changed while we pulled it?
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,6 @@ require (
 	github.com/calmh/incontainer v1.0.0
 	github.com/calmh/xdr v1.2.0
 	github.com/ccding/go-stun v0.1.5
-	github.com/chmduquesne/rollinghash v4.0.0+incompatible
 	github.com/d4l3k/messagediff v1.2.1
 	github.com/getsentry/raven-go v0.2.0
 	github.com/go-ldap/ldap/v3 v3.4.10
--- a/go.sum
+++ b/go.sum
@@ -29,8 +29,6 @@ github.com/certifi/gocertifi v0.0.0-20210507211836-431795d63e8d h1:S2NE3iHSwP0XV
 github.com/certifi/gocertifi v0.0.0-20210507211836-431795d63e8d/go.mod h1:sGbDF6GwGcLpkNXPUTkMRoywsNa/ol15pxFe6ERfguA=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/chmduquesne/rollinghash v4.0.0+incompatible h1:hnREQO+DXjqIw3rUTzWN7/+Dpw+N5Um8zpKV0JOEgbo=
-github.com/chmduquesne/rollinghash v4.0.0+incompatible/go.mod h1:Uc2I36RRfTAf7Dge82bi3RU0OQUmXT9iweIcPqvr8A0=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
--- a/internal/gen/bep/bep.pb.go
+++ b/internal/gen/bep/bep.pb.go
@@ -1093,10 +1093,9 @@ type BlockInfo struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields

-	Hash     []byte `protobuf:"bytes,3,opt,name=hash,proto3" json:"hash,omitempty"`
-	Offset   int64  `protobuf:"varint,1,opt,name=offset,proto3" json:"offset,omitempty"`
-	Size     int32  `protobuf:"varint,2,opt,name=size,proto3" json:"size,omitempty"`
-	WeakHash uint32 `protobuf:"varint,4,opt,name=weak_hash,json=weakHash,proto3" json:"weak_hash,omitempty"`
+	Hash   []byte `protobuf:"bytes,3,opt,name=hash,proto3" json:"hash,omitempty"`
+	Offset int64  `protobuf:"varint,1,opt,name=offset,proto3" json:"offset,omitempty"`
+	Size   int32  `protobuf:"varint,2,opt,name=size,proto3" json:"size,omitempty"`
 }

 func (x *BlockInfo) Reset() {
@@ -1150,13 +1149,6 @@ func (x *BlockInfo) GetSize() int32 {
 	return 0
 }

-func (x *BlockInfo) GetWeakHash() uint32 {
-	if x != nil {
-		return x.WeakHash
-	}
-	return 0
-}
-
 type Vector struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1578,7 +1570,6 @@ type Request struct {
 	Size          int32  `protobuf:"varint,5,opt,name=size,proto3" json:"size,omitempty"`
 	Hash          []byte `protobuf:"bytes,6,opt,name=hash,proto3" json:"hash,omitempty"`
 	FromTemporary bool   `protobuf:"varint,7,opt,name=from_temporary,json=fromTemporary,proto3" json:"from_temporary,omitempty"`
-	WeakHash      uint32 `protobuf:"varint,8,opt,name=weak_hash,json=weakHash,proto3" json:"weak_hash,omitempty"`
 	BlockNo       int32  `protobuf:"varint,9,opt,name=block_no,json=blockNo,proto3" json:"block_no,omitempty"`
 }

@@ -1661,13 +1652,6 @@ func (x *Request) GetFromTemporary() bool {
 	return false
 }

-func (x *Request) GetWeakHash() uint32 {
-	if x != nil {
-		return x.WeakHash
-	}
-	return 0
-}
-
 func (x *Request) GetBlockNo() int32 {
 	if x != nil {
 		return x.BlockNo
@@ -2079,158 +2063,155 @@ var file_bep_bep_proto_rawDesc = []byte{
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 }

 var (
--- a/lib/api/testdata/config/config.xml
+++ b/lib/api/testdata/config/config.xml
@@ -18,7 +18,6 @@
        <disableSparseFiles>false</disableSparseFiles>
        <disableTempIndexes>false</disableTempIndexes>
        <paused>false</paused>
-        <weakHashThresholdPct>25</weakHashThresholdPct>
        <markerName>.stfolder</markerName>
        <useLargeBlocks>true</useLargeBlocks>
    </folder>
@@ -39,7 +38,6 @@
        <disableSparseFiles>false</disableSparseFiles>
        <disableTempIndexes>false</disableTempIndexes>
        <paused>false</paused>
-        <weakHashThresholdPct>25</weakHashThresholdPct>
        <markerName>.stfolder</markerName>
        <useLargeBlocks>true</useLargeBlocks>
    </folder>
--- a/lib/config/config_test.go
+++ b/lib/config/config_test.go
@@ -114,10 +114,9 @@ func TestDefaultValues(t *testing.T) {
 					CleanupIntervalS: 3600,
 					Params:           map[string]string{},
 				},
-				MaxConflicts:         10,
-				WeakHashThresholdPct: 25,
-				MarkerName:           ".stfolder",
-				MaxConcurrentWrites:  2,
+				MaxConflicts:        10,
+				MarkerName:          ".stfolder",
+				MaxConcurrentWrites: 2,
 				XattrFilter: XattrFilter{
 					Entries:            []XattrFilterEntry{},
 					MaxSingleEntrySize: 1024,
@@ -190,10 +189,9 @@ func TestDeviceConfig(t *testing.T) {
 				Versioning: VersioningConfiguration{
 					Params: map[string]string{},
 				},
-				WeakHashThresholdPct: 25,
-				MarkerName:           DefaultMarkerName,
-				JunctionsAsDirs:      true,
-				MaxConcurrentWrites:  maxConcurrentWritesDefault,
+				MarkerName:          DefaultMarkerName,
+				JunctionsAsDirs:     true,
+				MaxConcurrentWrites: maxConcurrentWritesDefault,
 				XattrFilter: XattrFilter{
 					Entries: []XattrFilterEntry{},
 				},
--- a/lib/config/folderconfiguration.go
+++ b/lib/config/folderconfiguration.go
@@ -70,7 +70,6 @@ type FolderConfiguration struct {
 	DisableSparseFiles      bool                        `json:"disableSparseFiles" xml:"disableSparseFiles"`
 	DisableTempIndexes      bool                        `json:"disableTempIndexes" xml:"disableTempIndexes"`
 	Paused                  bool                        `json:"paused" xml:"paused"`
-	WeakHashThresholdPct    int                         `json:"weakHashThresholdPct" xml:"weakHashThresholdPct"`
 	MarkerName              string                      `json:"markerName" xml:"markerName"`
 	CopyOwnershipFromParent bool                        `json:"copyOwnershipFromParent" xml:"copyOwnershipFromParent"`
 	RawModTimeWindowS       int                         `json:"modTimeWindowS" xml:"modTimeWindowS"`
@@ -311,10 +310,6 @@ func (f *FolderConfiguration) prepare(myID protocol.DeviceID, existingDevices ma
 		f.Versioning.CleanupIntervalS = 0
 	}

-	if f.WeakHashThresholdPct == 0 {
-		f.WeakHashThresholdPct = 25
-	}
-
 	if f.MarkerName == "" {
 		f.MarkerName = DefaultMarkerName
 	}
--- a/lib/config/testdata/overridenvalues.xml
+++ b/lib/config/testdata/overridenvalues.xml
@@ -70,7 +70,6 @@
            <disableSparseFiles>false</disableSparseFiles>
            <disableTempIndexes>false</disableTempIndexes>
            <paused>false</paused>
-            <weakHashThresholdPct>25</weakHashThresholdPct>
            <markerName>.stfolder</markerName>
            <copyOwnershipFromParent>false</copyOwnershipFromParent>
            <modTimeWindowS>0</modTimeWindowS>
--- a/lib/model/fakeconns_test.go
+++ b/lib/model/fakeconns_test.go
@@ -75,7 +75,7 @@ func (f *fakeConnection) DownloadProgress(_ context.Context, dp *protocol.Downlo

 func (f *fakeConnection) addFileLocked(name string, flags uint32, ftype protocol.FileInfoType, data []byte, version protocol.Vector, localFlags uint32) {
 	blockSize := protocol.BlockSize(int64(len(data)))
-	blocks, _ := scanner.Blocks(context.TODO(), bytes.NewReader(data), blockSize, int64(len(data)), nil, true)
+	blocks, _ := scanner.Blocks(context.TODO(), bytes.NewReader(data), blockSize, int64(len(data)), nil)

 	file := protocol.FileInfo{
 		Name:       name,
--- a/lib/model/folder_recvonly_test.go
+++ b/lib/model/folder_recvonly_test.go
@@ -560,7 +560,7 @@ func setupKnownFiles(t *testing.T, ffs fs.Filesystem, data []byte) []protocol.Fi
 	if err != nil {
 		t.Fatal(err)
 	}
-	blocks, _ := scanner.Blocks(context.TODO(), bytes.NewReader(data), protocol.BlockSize(int64(len(data))), int64(len(data)), nil, true)
+	blocks, _ := scanner.Blocks(context.TODO(), bytes.NewReader(data), protocol.BlockSize(int64(len(data))), int64(len(data)), nil)
 	knownFiles := []protocol.FileInfo{
 		{
 			Name:        "knownDir",
--- a/lib/model/folder_sendrecv.go
+++ b/lib/model/folder_sendrecv.go
@@ -31,7 +31,6 @@ import (
 	"github.com/syncthing/syncthing/lib/semaphore"
 	"github.com/syncthing/syncthing/lib/sync"
 	"github.com/syncthing/syncthing/lib/versioner"
-	"github.com/syncthing/syncthing/lib/weakhash"
 )

 var (
@@ -1136,12 +1135,12 @@ func (f *sendReceiveFolder) handleFile(file protocol.FileInfo, snap *db.Snapshot
 func (f *sendReceiveFolder) reuseBlocks(blocks []protocol.BlockInfo, reused []int, file protocol.FileInfo, tempName string) ([]protocol.BlockInfo, []int) {
 	// Check for an old temporary file which might have some blocks we could
 	// reuse.
-	tempBlocks, err := scanner.HashFile(f.ctx, f.ID, f.mtimefs, tempName, file.BlockSize(), nil, false)
+	tempBlocks, err := scanner.HashFile(f.ctx, f.ID, f.mtimefs, tempName, file.BlockSize(), nil)
 	if err != nil {
 		var caseErr *fs.ErrCaseConflict
 		if errors.As(err, &caseErr) {
 			if rerr := f.mtimefs.Rename(caseErr.Real, tempName); rerr == nil {
-				tempBlocks, err = scanner.HashFile(f.ctx, f.ID, f.mtimefs, tempName, file.BlockSize(), nil, false)
+				tempBlocks, err = scanner.HashFile(f.ctx, f.ID, f.mtimefs, tempName, file.BlockSize(), nil)
 			}
 		}
 	}
@@ -1310,8 +1309,6 @@ func (f *sendReceiveFolder) copierRoutine(in <-chan copyBlocksState, pullChan ch
 			f.model.progressEmitter.Register(state.sharedPullerState)
 		}

-		weakHashFinder, file := f.initWeakHashFinder(state)
-
 	blocks:
 		for _, block := range state.blocks {
 			select {
@@ -1336,75 +1333,49 @@ func (f *sendReceiveFolder) copierRoutine(in <-chan copyBlocksState, pullChan ch

 			buf = protocol.BufferPool.Upgrade(buf, int(block.Size))

-			var found bool
-			if f.Type != config.FolderTypeReceiveEncrypted {
-				found, err = weakHashFinder.Iterate(block.WeakHash, buf, func(offset int64) bool {
-					if f.verifyBuffer(buf, block) != nil {
-						return true
-					}
-
-					err = f.limitedWriteAt(dstFd, buf, block.Offset)
-					if err != nil {
-						state.fail(fmt.Errorf("dst write: %w", err))
-					}
-					if offset == block.Offset {
-						state.copiedFromOrigin(block.Size)
-					} else {
-						state.copiedFromOriginShifted(block.Size)
-					}
-
-					return false
-				})
+			found := f.model.finder.Iterate(folders, block.Hash, func(folder, path string, index int32) bool {
+				ffs := folderFilesystems[folder]
+				fd, err := ffs.Open(path)
 				if err != nil {
-					l.Debugln("weak hasher iter", err)
+					return false
 				}
-			}
+				defer fd.Close()

-			if !found {
-				found = f.model.finder.Iterate(folders, block.Hash, func(folder, path string, index int32) bool {
-					ffs := folderFilesystems[folder]
-					fd, err := ffs.Open(path)
-					if err != nil {
+				srcOffset := int64(state.file.BlockSize()) * int64(index)
+				_, err = fd.ReadAt(buf, srcOffset)
+				if err != nil {
+					return false
+				}
+
+				// Hash is not SHA256 as it's an encrypted hash token. In that
+				// case we can't verify the block integrity so we'll take it on
+				// trust. (The other side can and will verify.)
+				if f.Type != config.FolderTypeReceiveEncrypted {
+					if err := f.verifyBuffer(buf, block); err != nil {
+						l.Debugln("Finder failed to verify buffer", err)
 						return false
 					}
-					defer fd.Close()
+				}

-					srcOffset := int64(state.file.BlockSize()) * int64(index)
-					_, err = fd.ReadAt(buf, srcOffset)
-					if err != nil {
-						return false
-					}
-
-					// Hash is not SHA256 as it's an encrypted hash token. In that
-					// case we can't verify the block integrity so we'll take it on
-					// trust. (The other side can and will verify.)
-					if f.Type != config.FolderTypeReceiveEncrypted {
-						if err := f.verifyBuffer(buf, block); err != nil {
-							l.Debugln("Finder failed to verify buffer", err)
-							return false
-						}
-					}
-
-					if f.CopyRangeMethod != config.CopyRangeMethodStandard {
-						err = f.withLimiter(func() error {
-							dstFd.mut.Lock()
-							defer dstFd.mut.Unlock()
-							return fs.CopyRange(f.CopyRangeMethod.ToFS(), fd, dstFd.fd, srcOffset, block.Offset, int64(block.Size))
-						})
-					} else {
-						err = f.limitedWriteAt(dstFd, buf, block.Offset)
-					}
-					if err != nil {
-						state.fail(fmt.Errorf("dst write: %w", err))
-					}
-					if path == state.file.Name {
-						state.copiedFromOrigin(block.Size)
-					} else {
-						state.copiedFromElsewhere(block.Size)
-					}
-					return true
-				})
-			}
+				if f.CopyRangeMethod != config.CopyRangeMethodStandard {
+					err = f.withLimiter(func() error {
+						dstFd.mut.Lock()
+						defer dstFd.mut.Unlock()
+						return fs.CopyRange(f.CopyRangeMethod.ToFS(), fd, dstFd.fd, srcOffset, block.Offset, int64(block.Size))
+					})
+				} else {
+					err = f.limitedWriteAt(dstFd, buf, block.Offset)
+				}
+				if err != nil {
+					state.fail(fmt.Errorf("dst write: %w", err))
+				}
+				if path == state.file.Name {
+					state.copiedFromOrigin(block.Size)
+				} else {
+					state.copiedFromElsewhere(block.Size)
+				}
+				return true
+			})

 			if state.failed() != nil {
 				break
@@ -1421,58 +1392,11 @@ func (f *sendReceiveFolder) copierRoutine(in <-chan copyBlocksState, pullChan ch
 				state.copyDone(block)
 			}
 		}
-		if file != nil {
-			// os.File used to return invalid argument if nil.
-			// fs.File panics as it's an interface.
-			file.Close()
-		}

 		out <- state.sharedPullerState
 	}
 }

-func (f *sendReceiveFolder) initWeakHashFinder(state copyBlocksState) (*weakhash.Finder, fs.File) {
-	if f.Type == config.FolderTypeReceiveEncrypted {
-		l.Debugln("not weak hashing due to folder type", f.Type)
-		return nil, nil
-	}
-
-	blocksPercentChanged := 0
-	if tot := len(state.file.Blocks); tot > 0 {
-		blocksPercentChanged = (tot - state.have) * 100 / tot
-	}
-
-	if blocksPercentChanged < f.WeakHashThresholdPct {
-		l.Debugf("not weak hashing %s. not enough changed %.02f < %d", state.file.Name, blocksPercentChanged, f.WeakHashThresholdPct)
-		return nil, nil
-	}
-
-	hashesToFind := make([]uint32, 0, len(state.blocks))
-	for _, block := range state.blocks {
-		if block.WeakHash != 0 {
-			hashesToFind = append(hashesToFind, block.WeakHash)
-		}
-	}
-
-	if len(hashesToFind) == 0 {
-		l.Debugf("not weak hashing %s. file did not contain any weak hashes", state.file.Name)
-		return nil, nil
-	}
-
-	file, err := f.mtimefs.Open(state.file.Name)
-	if err != nil {
-		l.Debugln("weak hasher", err)
-		return nil, nil
-	}
-
-	weakHashFinder, err := weakhash.NewFinder(f.ctx, file, state.file.BlockSize(), hashesToFind)
-	if err != nil {
-		l.Debugln("weak hasher", err)
-		return nil, file
-	}
-	return weakHashFinder, file
-}
-
 func (*sendReceiveFolder) verifyBuffer(buf []byte, block protocol.BlockInfo) error {
 	if len(buf) != int(block.Size) {
 		return fmt.Errorf("length mismatch %d != %d", len(buf), block.Size)
@@ -1574,7 +1498,7 @@ loop:
 		activity.using(selected)
 		var buf []byte
 		blockNo := int(state.block.Offset / int64(state.file.BlockSize()))
-		buf, lastError = f.model.RequestGlobal(f.ctx, selected.ID, f.folderID, state.file.Name, blockNo, state.block.Offset, int(state.block.Size), state.block.Hash, state.block.WeakHash, selected.FromTemporary)
+		buf, lastError = f.model.RequestGlobal(f.ctx, selected.ID, f.folderID, state.file.Name, blockNo, state.block.Offset, int(state.block.Size), state.block.Hash, selected.FromTemporary)
 		activity.done(selected)
 		if lastError != nil {
 			l.Debugln("request:", f.folderID, state.file.Name, state.block.Offset, state.block.Size, selected.ID.Short(), "returned error:", lastError)
--- a/lib/model/folder_sendrecv_test.go
+++ b/lib/model/folder_sendrecv_test.go
@@ -25,7 +25,6 @@ import (
 	"github.com/syncthing/syncthing/lib/fs"
 	"github.com/syncthing/syncthing/lib/ignore"
 	"github.com/syncthing/syncthing/lib/protocol"
-	"github.com/syncthing/syncthing/lib/rand"
 	"github.com/syncthing/syncthing/lib/scanner"
 	"github.com/syncthing/syncthing/lib/sync"
 )
@@ -300,7 +299,7 @@ func TestCopierFinder(t *testing.T) {
 	}

 	// Verify that the fetched blocks have actually been written to the temp file
-	blks, err := scanner.HashFile(context.TODO(), f.ID, f.Filesystem(nil), tempFile, protocol.MinBlockSize, nil, false)
+	blks, err := scanner.HashFile(context.TODO(), f.ID, f.Filesystem(nil), tempFile, protocol.MinBlockSize, nil)
 	if err != nil {
 		t.Log(err)
 	}
@@ -312,128 +311,6 @@ func TestCopierFinder(t *testing.T) {
 	}
 }

-func TestWeakHash(t *testing.T) {
-	// Setup the model/pull environment
-	_, fo, wcfgCancel := setupSendReceiveFolder(t)
-	defer wcfgCancel()
-	ffs := fo.Filesystem(nil)
-
-	tempFile := fs.TempName("weakhash")
-	var shift int64 = 10
-	var size int64 = 1 << 20
-	expectBlocks := int(size / protocol.MinBlockSize)
-	expectPulls := int(shift / protocol.MinBlockSize)
-	if shift > 0 {
-		expectPulls++
-	}
-
-	f, err := ffs.Create("weakhash")
-	must(t, err)
-	defer f.Close()
-	_, err = io.CopyN(f, rand.Reader, size)
-	if err != nil {
-		t.Error(err)
-	}
-	info, err := f.Stat()
-	if err != nil {
-		t.Error(err)
-	}
-
-	// Create two files, second file has `shifted` bytes random prefix, yet
-	// both are of the same length, for example:
-	// File 1: abcdefgh
-	// File 2: xyabcdef
-	f.Seek(0, io.SeekStart)
-	existing, err := scanner.Blocks(context.TODO(), f, protocol.MinBlockSize, size, nil, true)
-	if err != nil {
-		t.Error(err)
-	}
-
-	f.Seek(0, io.SeekStart)
-	remainder := io.LimitReader(f, size-shift)
-	prefix := io.LimitReader(rand.Reader, shift)
-	nf := io.MultiReader(prefix, remainder)
-	desired, err := scanner.Blocks(context.TODO(), nf, protocol.MinBlockSize, size, nil, true)
-	if err != nil {
-		t.Error(err)
-	}
-
-	existingFile := protocol.FileInfo{
-		Name:       "weakhash",
-		Blocks:     existing,
-		Size:       size,
-		ModifiedS:  info.ModTime().Unix(),
-		ModifiedNs: int32(info.ModTime().Nanosecond()),
-	}
-	desiredFile := protocol.FileInfo{
-		Name:      "weakhash",
-		Size:      size,
-		Blocks:    desired,
-		ModifiedS: info.ModTime().Unix() + 1,
-	}
-
-	fo.updateLocalsFromScanning([]protocol.FileInfo{existingFile})
-
-	copyChan := make(chan copyBlocksState)
-	pullChan := make(chan pullBlockState, expectBlocks)
-	finisherChan := make(chan *sharedPullerState, 1)
-
-	// Run a single fetcher routine
-	go fo.copierRoutine(copyChan, pullChan, finisherChan)
-	defer close(copyChan)
-
-	// Test 1 - no weak hashing, file gets fully repulled (`expectBlocks` pulls).
-	fo.WeakHashThresholdPct = 101
-	fo.handleFile(desiredFile, fsetSnapshot(t, fo.fset), copyChan)
-
-	var pulls []pullBlockState
-	timeout := time.After(10 * time.Second)
-	for len(pulls) < expectBlocks {
-		select {
-		case pull := <-pullChan:
-			pulls = append(pulls, pull)
-		case <-timeout:
-			t.Fatalf("timed out, got %d pulls expected %d", len(pulls), expectPulls)
-		}
-	}
-	finish := <-finisherChan
-
-	select {
-	case <-pullChan:
-		t.Fatal("Pull channel has data to be read")
-	case <-finisherChan:
-		t.Fatal("Finisher channel has data to be read")
-	default:
-	}
-
-	cleanupSharedPullerState(finish)
-	if err := ffs.Remove(tempFile); err != nil {
-		t.Fatal(err)
-	}
-
-	// Test 2 - using weak hash, expectPulls blocks pulled.
-	fo.WeakHashThresholdPct = -1
-	fo.handleFile(desiredFile, fsetSnapshot(t, fo.fset), copyChan)
-
-	pulls = pulls[:0]
-	for len(pulls) < expectPulls {
-		select {
-		case pull := <-pullChan:
-			pulls = append(pulls, pull)
-		case <-time.After(10 * time.Second):
-			t.Fatalf("timed out, got %d pulls expected %d", len(pulls), expectPulls)
-		}
-	}
-
-	finish = <-finisherChan
-	cleanupSharedPullerState(finish)
-
-	expectShifted := expectBlocks - expectPulls
-	if finish.copyOriginShifted != expectShifted {
-		t.Errorf("did not copy %d shifted", expectShifted)
-	}
-}
-
 // Test that updating a file removes its old blocks from the blockmap
 func TestCopierCleanup(t *testing.T) {
 	iterFn := func(folder, file string, index int32) bool {
@@ -709,8 +586,8 @@ func TestIssue3164(t *testing.T) {

 func TestDiff(t *testing.T) {
 	for i, test := range diffTestData {
-		a, _ := scanner.Blocks(context.TODO(), bytes.NewBufferString(test.a), test.s, -1, nil, false)
-		b, _ := scanner.Blocks(context.TODO(), bytes.NewBufferString(test.b), test.s, -1, nil, false)
+		a, _ := scanner.Blocks(context.TODO(), bytes.NewBufferString(test.a), test.s, -1, nil)
+		b, _ := scanner.Blocks(context.TODO(), bytes.NewBufferString(test.b), test.s, -1, nil)
 		_, d := blockDiff(a, b)
 		if len(d) != len(test.d) {
 			t.Fatalf("Incorrect length for diff %d; %d != %d", i, len(d), len(test.d))
@@ -730,8 +607,8 @@ func TestDiff(t *testing.T) {
 func BenchmarkDiff(b *testing.B) {
 	testCases := make([]struct{ a, b []protocol.BlockInfo }, 0, len(diffTestData))
 	for _, test := range diffTestData {
-		a, _ := scanner.Blocks(context.TODO(), bytes.NewBufferString(test.a), test.s, -1, nil, false)
-		b, _ := scanner.Blocks(context.TODO(), bytes.NewBufferString(test.b), test.s, -1, nil, false)
+		a, _ := scanner.Blocks(context.TODO(), bytes.NewBufferString(test.a), test.s, -1, nil)
+		b, _ := scanner.Blocks(context.TODO(), bytes.NewBufferString(test.b), test.s, -1, nil)
 		testCases = append(testCases, struct{ a, b []protocol.BlockInfo }{a, b})
 	}
 	b.ReportAllocs()
--- a/lib/model/metrics.go
+++ b/lib/model/metrics.go
@@ -55,16 +55,15 @@ var (
 		Namespace: "syncthing",
 		Subsystem: "model",
 		Name:      "folder_processed_bytes_total",
-		Help:      "Total amount of data processed during folder syncing, per folder ID and data source (network/local_origin/local_other/local_shifted/skipped)",
+		Help:      "Total amount of data processed during folder syncing, per folder ID and data source (network/local_origin/local_other/skipped)",
 	}, []string{"folder", "source"})
 )

 const (
-	metricSourceNetwork      = "network"       // from the network
-	metricSourceLocalOrigin  = "local_origin"  // from the existing version of the local file
-	metricSourceLocalOther   = "local_other"   // from a different local file
-	metricSourceLocalShifted = "local_shifted" // from the existing version of the local file, rolling hash shifted
-	metricSourceSkipped      = "skipped"       // block of all zeroes, invented out of thin air
+	metricSourceNetwork     = "network"      // from the network
+	metricSourceLocalOrigin = "local_origin" // from the existing version of the local file
+	metricSourceLocalOther  = "local_other"  // from a different local file
+	metricSourceSkipped     = "skipped"      // block of all zeroes, invented out of thin air

 	metricScopeGlobal = "global"
 	metricScopeLocal  = "local"
@@ -88,6 +87,5 @@ func registerFolderMetrics(folderID string) {
 	metricFolderProcessedBytesTotal.WithLabelValues(folderID, metricSourceNetwork)
 	metricFolderProcessedBytesTotal.WithLabelValues(folderID, metricSourceLocalOrigin)
 	metricFolderProcessedBytesTotal.WithLabelValues(folderID, metricSourceLocalOther)
-	metricFolderProcessedBytesTotal.WithLabelValues(folderID, metricSourceLocalShifted)
 	metricFolderProcessedBytesTotal.WithLabelValues(folderID, metricSourceSkipped)
 }
--- a/lib/model/mocks/model.go
+++ b/lib/model/mocks/model.go
@@ -435,19 +435,18 @@ type Model struct {
 		result1 protocol.RequestResponse
 		result2 error
 	}
-	RequestGlobalStub        func(context.Context, protocol.DeviceID, string, string, int, int64, int, []byte, uint32, bool) ([]byte, error)
+	RequestGlobalStub        func(context.Context, protocol.DeviceID, string, string, int, int64, int, []byte, bool) ([]byte, error)
 	requestGlobalMutex       sync.RWMutex
 	requestGlobalArgsForCall []struct {
-		arg1  context.Context
-		arg2  protocol.DeviceID
-		arg3  string
-		arg4  string
-		arg5  int
-		arg6  int64
-		arg7  int
-		arg8  []byte
-		arg9  uint32
-		arg10 bool
+		arg1 context.Context
+		arg2 protocol.DeviceID
+		arg3 string
+		arg4 string
+		arg5 int
+		arg6 int64
+		arg7 int
+		arg8 []byte
+		arg9 bool
 	}
 	requestGlobalReturns struct {
 		result1 []byte
@@ -2580,7 +2579,7 @@ func (fake *Model) RequestReturnsOnCall(i int, result1 protocol.RequestResponse,
 	}{result1, result2}
 }

-func (fake *Model) RequestGlobal(arg1 context.Context, arg2 protocol.DeviceID, arg3 string, arg4 string, arg5 int, arg6 int64, arg7 int, arg8 []byte, arg9 uint32, arg10 bool) ([]byte, error) {
+func (fake *Model) RequestGlobal(arg1 context.Context, arg2 protocol.DeviceID, arg3 string, arg4 string, arg5 int, arg6 int64, arg7 int, arg8 []byte, arg9 bool) ([]byte, error) {
 	var arg8Copy []byte
 	if arg8 != nil {
 		arg8Copy = make([]byte, len(arg8))
@@ -2589,23 +2588,22 @@ func (fake *Model) RequestGlobal(arg1 context.Context, arg2 protocol.DeviceID, a
 	fake.requestGlobalMutex.Lock()
 	ret, specificReturn := fake.requestGlobalReturnsOnCall[len(fake.requestGlobalArgsForCall)]
 	fake.requestGlobalArgsForCall = append(fake.requestGlobalArgsForCall, struct {
-		arg1  context.Context
-		arg2  protocol.DeviceID
-		arg3  string
-		arg4  string
-		arg5  int
-		arg6  int64
-		arg7  int
-		arg8  []byte
-		arg9  uint32
-		arg10 bool
-	}{arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8Copy, arg9, arg10})
+		arg1 context.Context
+		arg2 protocol.DeviceID
+		arg3 string
+		arg4 string
+		arg5 int
+		arg6 int64
+		arg7 int
+		arg8 []byte
+		arg9 bool
+	}{arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8Copy, arg9})
 	stub := fake.RequestGlobalStub
 	fakeReturns := fake.requestGlobalReturns
-	fake.recordInvocation("RequestGlobal", []interface{}{arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8Copy, arg9, arg10})
+	fake.recordInvocation("RequestGlobal", []interface{}{arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8Copy, arg9})
 	fake.requestGlobalMutex.Unlock()
 	if stub != nil {
-		return stub(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10)
+		return stub(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9)
 	}
 	if specificReturn {
 		return ret.result1, ret.result2
@@ -2619,17 +2617,17 @@ func (fake *Model) RequestGlobalCallCount() int {
 	return len(fake.requestGlobalArgsForCall)
 }

-func (fake *Model) RequestGlobalCalls(stub func(context.Context, protocol.DeviceID, string, string, int, int64, int, []byte, uint32, bool) ([]byte, error)) {
+func (fake *Model) RequestGlobalCalls(stub func(context.Context, protocol.DeviceID, string, string, int, int64, int, []byte, bool) ([]byte, error)) {
 	fake.requestGlobalMutex.Lock()
 	defer fake.requestGlobalMutex.Unlock()
 	fake.RequestGlobalStub = stub
 }

-func (fake *Model) RequestGlobalArgsForCall(i int) (context.Context, protocol.DeviceID, string, string, int, int64, int, []byte, uint32, bool) {
+func (fake *Model) RequestGlobalArgsForCall(i int) (context.Context, protocol.DeviceID, string, string, int, int64, int, []byte, bool) {
 	fake.requestGlobalMutex.RLock()
 	defer fake.requestGlobalMutex.RUnlock()
 	argsForCall := fake.requestGlobalArgsForCall[i]
-	return argsForCall.arg1, argsForCall.arg2, argsForCall.arg3, argsForCall.arg4, argsForCall.arg5, argsForCall.arg6, argsForCall.arg7, argsForCall.arg8, argsForCall.arg9, argsForCall.arg10
+	return argsForCall.arg1, argsForCall.arg2, argsForCall.arg3, argsForCall.arg4, argsForCall.arg5, argsForCall.arg6, argsForCall.arg7, argsForCall.arg8, argsForCall.arg9
 }

 func (fake *Model) RequestGlobalReturns(result1 []byte, result2 error) {
--- a/lib/model/model.go
+++ b/lib/model/model.go
@@ -118,7 +118,7 @@ type Model interface {

 	GlobalDirectoryTree(folder, prefix string, levels int, dirsOnly bool) ([]*TreeEntry, error)

-	RequestGlobal(ctx context.Context, deviceID protocol.DeviceID, folder, name string, blockNo int, offset int64, size int, hash []byte, weakHash uint32, fromTemporary bool) ([]byte, error)
+	RequestGlobal(ctx context.Context, deviceID protocol.DeviceID, folder, name string, blockNo int, offset int64, size int, hash []byte, fromTemporary bool) ([]byte, error)
 }

 type model struct {
@@ -606,8 +606,6 @@ func (m *model) UsageReportingStats(report *contract.Report, version int, previe
 				report.BlockStats.Pulled = v
 			case "copyOrigin":
 				report.BlockStats.CopyOrigin = v
-			case "copyOriginShifted":
-				report.BlockStats.CopyOriginShifted = v
 			case "copyElsewhere":
 				report.BlockStats.CopyElsewhere = v
 			}
@@ -2036,7 +2034,7 @@ func (m *model) Request(conn protocol.Connection, req *protocol.Request) (out pr
 			return nil, protocol.ErrNoSuchFile
 		}
 		_, err := readOffsetIntoBuf(folderFs, tempFn, req.Offset, res.data)
-		if err == nil && scanner.Validate(res.data, req.Hash, req.WeakHash) {
+		if err == nil && scanner.Validate(res.data, req.Hash) {
 			return res, nil
 		}
 		// Fall through to reading from a non-temp file, just in case the temp
@@ -2065,8 +2063,8 @@ func (m *model) Request(conn protocol.Connection, req *protocol.Request) (out pr
 		return nil, protocol.ErrGeneric
 	}

-	if folderCfg.Type != config.FolderTypeReceiveEncrypted && len(req.Hash) > 0 && !scanner.Validate(res.data[:n], req.Hash, req.WeakHash) {
-		m.recheckFile(deviceID, req.Folder, req.Name, req.Offset, req.Hash, req.WeakHash)
+	if folderCfg.Type != config.FolderTypeReceiveEncrypted && len(req.Hash) > 0 && !scanner.Validate(res.data[:n], req.Hash) {
+		m.recheckFile(deviceID, req.Folder, req.Name, req.Offset, req.Hash)
 		l.Debugf("%v REQ(in) failed validating data: %s: %q / %q o=%d s=%d", m, deviceID.Short(), req.Folder, req.Name, req.Offset, req.Size)
 		return nil, protocol.ErrNoSuchFile
 	}
@@ -2092,7 +2090,7 @@ func newLimitedRequestResponse(size int, limiters ...*semaphore.Semaphore) *requ
 	return res
 }

-func (m *model) recheckFile(deviceID protocol.DeviceID, folder, name string, offset int64, hash []byte, weakHash uint32) {
+func (m *model) recheckFile(deviceID protocol.DeviceID, folder, name string, offset int64, hash []byte) {
 	cf, ok, err := m.CurrentFolderFile(folder, name)
 	if err != nil {
 		l.Debugf("%v recheckFile: %s: %q / %q: current file error: %v", m, deviceID, folder, name, err)
@@ -2121,10 +2119,6 @@ func (m *model) recheckFile(deviceID protocol.DeviceID, folder, name string, off
 		l.Debugf("%v recheckFile: %s: %q / %q i=%d: hash mismatch %x != %x", m, deviceID, folder, name, blockIndex, block.Hash, hash)
 		return
 	}
-	if weakHash != 0 && block.WeakHash != weakHash {
-		l.Debugf("%v recheckFile: %s: %q / %q i=%d: weak hash mismatch %v != %v", m, deviceID, folder, name, blockIndex, block.WeakHash, weakHash)
-		return
-	}

 	// The hashes provided part of the request match what we expect to find according
 	// to what we have in the database, yet the content we've read off the filesystem doesn't
@@ -2462,14 +2456,14 @@ func (m *model) deviceDidCloseRLocked(deviceID protocol.DeviceID, duration time.
 	}
 }

-func (m *model) RequestGlobal(ctx context.Context, deviceID protocol.DeviceID, folder, name string, blockNo int, offset int64, size int, hash []byte, weakHash uint32, fromTemporary bool) ([]byte, error) {
+func (m *model) RequestGlobal(ctx context.Context, deviceID protocol.DeviceID, folder, name string, blockNo int, offset int64, size int, hash []byte, fromTemporary bool) ([]byte, error) {
 	conn, connOK := m.requestConnectionForDevice(deviceID)
 	if !connOK {
 		return nil, fmt.Errorf("requestGlobal: no connection to device: %s", deviceID.Short())
 	}

-	l.Debugf("%v REQ(out): %s (%s): %q / %q b=%d o=%d s=%d h=%x wh=%x ft=%t", m, deviceID.Short(), conn, folder, name, blockNo, offset, size, hash, weakHash, fromTemporary)
-	return conn.Request(ctx, &protocol.Request{Folder: folder, Name: name, BlockNo: blockNo, Offset: offset, Size: size, Hash: hash, WeakHash: weakHash, FromTemporary: fromTemporary})
+	l.Debugf("%v REQ(out): %s (%s): %q / %q b=%d o=%d s=%d h=%x ft=%t", m, deviceID.Short(), conn, folder, name, blockNo, offset, size, hash, fromTemporary)
+	return conn.Request(ctx, &protocol.Request{Folder: folder, Name: name, BlockNo: blockNo, Offset: offset, Size: size, Hash: hash, FromTemporary: fromTemporary})
 }

 // requestConnectionForDevice returns a connection to the given device, to
--- a/lib/model/model_test.go
+++ b/lib/model/model_test.go
@@ -222,7 +222,7 @@ func BenchmarkRequestOut(b *testing.B) {

 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		data, err := m.RequestGlobal(context.Background(), device1, "default", files[i%n].Name, 0, 0, 32, nil, 0, false)
+		data, err := m.RequestGlobal(context.Background(), device1, "default", files[i%n].Name, 0, 0, 32, nil, false)
 		if err != nil {
 			b.Error(err)
 		}
@@ -2819,9 +2819,9 @@ func TestIssue5002(t *testing.T) {
 	}
 	blockSize := int32(file.BlockSize())

-	m.recheckFile(protocol.LocalDeviceID, "default", "foo", file.Size-int64(blockSize), []byte{1, 2, 3, 4}, 0)
-	m.recheckFile(protocol.LocalDeviceID, "default", "foo", file.Size, []byte{1, 2, 3, 4}, 0) // panic
-	m.recheckFile(protocol.LocalDeviceID, "default", "foo", file.Size+int64(blockSize), []byte{1, 2, 3, 4}, 0)
+	m.recheckFile(protocol.LocalDeviceID, "default", "foo", file.Size-int64(blockSize), []byte{1, 2, 3, 4})
+	m.recheckFile(protocol.LocalDeviceID, "default", "foo", file.Size, []byte{1, 2, 3, 4}) // panic
+	m.recheckFile(protocol.LocalDeviceID, "default", "foo", file.Size+int64(blockSize), []byte{1, 2, 3, 4})
 }

 func TestParentOfUnignored(t *testing.T) {
--- a/lib/model/requests_test.go
+++ b/lib/model/requests_test.go
@@ -436,11 +436,8 @@ func TestRescanIfHaveInvalidContent(t *testing.T) {
 	}

 	f := checkReceived(<-received)
-	if f.Blocks[0].WeakHash != 103547413 {
-		t.Fatalf("unexpected weak hash: %d != 103547413", f.Blocks[0].WeakHash)
-	}

-	res, err := m.Request(device1Conn, &protocol.Request{Folder: "default", Name: "foo", Size: len(payload), Hash: f.Blocks[0].Hash, WeakHash: f.Blocks[0].WeakHash})
+	res, err := m.Request(device1Conn, &protocol.Request{Folder: "default", Name: "foo", Size: len(payload), Hash: f.Blocks[0].Hash})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -454,17 +451,14 @@ func TestRescanIfHaveInvalidContent(t *testing.T) {

 	writeFile(t, tfs, "foo", payload)

-	_, err = m.Request(device1Conn, &protocol.Request{Folder: "default", Name: "foo", Size: len(payload), Hash: f.Blocks[0].Hash, WeakHash: f.Blocks[0].WeakHash})
+	_, err = m.Request(device1Conn, &protocol.Request{Folder: "default", Name: "foo", Size: len(payload), Hash: f.Blocks[0].Hash})
 	if err == nil {
 		t.Fatalf("expected failure")
 	}

 	select {
 	case fs := <-received:
-		f := checkReceived(fs)
-		if f.Blocks[0].WeakHash != 41943361 {
-			t.Fatalf("unexpected weak hash: %d != 41943361", f.Blocks[0].WeakHash)
-		}
+		checkReceived(fs)
 	case <-time.After(time.Second):
 		t.Fatalf("timed out")
 	}
--- a/lib/model/sharedpullerstate.go
+++ b/lib/model/sharedpullerstate.go
@@ -285,15 +285,6 @@ func (s *sharedPullerState) skippedSparseBlock(bytes int) {
 	metricFolderProcessedBytesTotal.WithLabelValues(s.folder, metricSourceSkipped).Add(float64(bytes))
 }

-func (s *sharedPullerState) copiedFromOriginShifted(bytes int) {
-	s.mut.Lock()
-	s.copyOrigin++
-	s.copyOriginShifted++
-	s.updated = time.Now()
-	s.mut.Unlock()
-	metricFolderProcessedBytesTotal.WithLabelValues(s.folder, metricSourceLocalShifted).Add(float64(bytes))
-}
-
 func (s *sharedPullerState) pullStarted() {
 	s.mut.Lock()
 	s.copyTotal--
--- a/lib/protocol/bep_fileinfo.go
+++ b/lib/protocol/bep_fileinfo.go
@@ -544,32 +544,29 @@ func (f *FileInfo) setNoContent() {
 }

 type BlockInfo struct {
-	Hash     []byte
-	Offset   int64
-	Size     int
-	WeakHash uint32
+	Hash   []byte
+	Offset int64
+	Size   int
 }

 func (b BlockInfo) ToWire() *bep.BlockInfo {
 	return &bep.BlockInfo{
-		Hash:     b.Hash,
-		Offset:   b.Offset,
-		Size:     int32(b.Size),
-		WeakHash: b.WeakHash,
+		Hash:   b.Hash,
+		Offset: b.Offset,
+		Size:   int32(b.Size),
 	}
 }

 func BlockInfoFromWire(w *bep.BlockInfo) BlockInfo {
 	return BlockInfo{
-		Hash:     w.Hash,
-		Offset:   w.Offset,
-		Size:     int(w.Size),
-		WeakHash: w.WeakHash,
+		Hash:   w.Hash,
+		Offset: w.Offset,
+		Size:   int(w.Size),
 	}
 }

 func (b BlockInfo) String() string {
-	return fmt.Sprintf("Block{%d/%d/%d/%x}", b.Offset, b.Size, b.WeakHash, b.Hash)
+	return fmt.Sprintf("Block{%d/%d/%x}", b.Offset, b.Size, b.Hash)
 }

 // For each block size, the hash of a block of all zeroes
@@ -596,7 +593,6 @@ func BlocksHash(bs []BlockInfo) []byte {
 	h := sha256.New()
 	for _, b := range bs {
 		_, _ = h.Write(b.Hash)
-		_ = binary.Write(h, binary.BigEndian, b.WeakHash)
 	}
 	return h.Sum(nil)
 }
--- a/lib/protocol/bep_request_response.go
+++ b/lib/protocol/bep_request_response.go
@@ -25,7 +25,6 @@ type Request struct {
 	Size          int
 	Hash          []byte
 	FromTemporary bool
-	WeakHash      uint32
 	BlockNo       int
 }

@@ -38,7 +37,6 @@ func (r *Request) toWire() *bep.Request {
 		Size:          int32(r.Size),
 		Hash:          r.Hash,
 		FromTemporary: r.FromTemporary,
-		WeakHash:      r.WeakHash,
 		BlockNo:       int32(r.BlockNo),
 	}
 }
@@ -52,7 +50,6 @@ func requestFromWire(w *bep.Request) *Request {
 		Size:          int(w.Size),
 		Hash:          w.Hash,
 		FromTemporary: w.FromTemporary,
-		WeakHash:      w.WeakHash,
 		BlockNo:       int(w.BlockNo),
 	}
 }
--- a/lib/protocol/common_test.go
+++ b/lib/protocol/common_test.go
@@ -17,7 +17,6 @@ type TestModel struct {
 	offset        int64
 	size          int32
 	hash          []byte
-	weakHash      uint32
 	fromTemporary bool
 	indexFn       func(string, []FileInfo)
 	ccFn          func(*ClusterConfig)
@@ -48,7 +47,6 @@ func (t *TestModel) Request(_ Connection, req *Request) (RequestResponse, error)
 	t.offset = req.Offset
 	t.size = int32(req.Size)
 	t.hash = req.Hash
-	t.weakHash = req.WeakHash
 	t.fromTemporary = req.FromTemporary
 	buf := make([]byte, len(t.data))
 	copy(buf, t.data)
--- a/lib/scanner/blockqueue.go
+++ b/lib/scanner/blockqueue.go
@@ -16,7 +16,7 @@ import (
 )

 // HashFile hashes the files and returns a list of blocks representing the file.
-func HashFile(ctx context.Context, folderID string, fs fs.Filesystem, path string, blockSize int, counter Counter, useWeakHashes bool) ([]protocol.BlockInfo, error) {
+func HashFile(ctx context.Context, folderID string, fs fs.Filesystem, path string, blockSize int, counter Counter) ([]protocol.BlockInfo, error) {
 	fd, err := fs.Open(path)
 	if err != nil {
 		l.Debugln("open:", err)
@@ -36,7 +36,7 @@ func HashFile(ctx context.Context, folderID string, fs fs.Filesystem, path strin

 	// Hash the file. This may take a while for large files.

-	blocks, err := Blocks(ctx, fd, blockSize, size, counter, useWeakHashes)
+	blocks, err := Blocks(ctx, fd, blockSize, size, counter)
 	if err != nil {
 		l.Debugln("blocks:", err)
 		return nil, err
@@ -108,7 +108,7 @@ func (ph *parallelHasher) hashFiles(ctx context.Context) {
 				panic("Bug. Asked to hash a directory or a deleted file.")
 			}

-			blocks, err := HashFile(ctx, ph.folderID, ph.fs, f.Name, f.BlockSize(), ph.counter, true)
+			blocks, err := HashFile(ctx, ph.folderID, ph.fs, f.Name, f.BlockSize(), ph.counter)
 			if err != nil {
 				handleError(ctx, "hashing", f.Name, err, ph.outbox)
 				continue
--- a/lib/scanner/blocks.go
+++ b/lib/scanner/blocks.go
@@ -10,8 +10,6 @@ import (
 	"bytes"
 	"context"
 	"crypto/sha256"
-	"hash"
-	"hash/adler32"
 	"io"

 	"github.com/syncthing/syncthing/lib/protocol"
@@ -24,7 +22,7 @@ type Counter interface {
 }

 // Blocks returns the blockwise hash of the reader.
-func Blocks(ctx context.Context, r io.Reader, blocksize int, sizehint int64, counter Counter, useWeakHashes bool) ([]protocol.BlockInfo, error) {
+func Blocks(ctx context.Context, r io.Reader, blocksize int, sizehint int64, counter Counter) ([]protocol.BlockInfo, error) {
 	if counter == nil {
 		counter = &noopCounter{}
 	}
@@ -32,15 +30,6 @@ func Blocks(ctx context.Context, r io.Reader, blocksize int, sizehint int64, cou
 	hf := sha256.New()
 	const hashLength = sha256.Size

-	var weakHf hash.Hash32 = noopHash{}
-	var multiHf io.Writer = hf
-	if useWeakHashes {
-		// Use an actual weak hash function, make the multiHf
-		// write to both hash functions.
-		weakHf = adler32.New()
-		multiHf = io.MultiWriter(hf, weakHf)
-	}
-
 	var blocks []protocol.BlockInfo
 	var hashes, thisHash []byte

@@ -70,7 +59,7 @@ func Blocks(ctx context.Context, r io.Reader, blocksize int, sizehint int64, cou
 		}

 		lr.N = int64(blocksize)
-		n, err := io.CopyBuffer(multiHf, lr, buf)
+		n, err := io.CopyBuffer(hf, lr, buf)
 		if err != nil {
 			return nil, err
 		}
@@ -87,17 +76,15 @@ func Blocks(ctx context.Context, r io.Reader, blocksize int, sizehint int64, cou
 		thisHash, hashes = hashes[:hashLength], hashes[hashLength:]

 		b := protocol.BlockInfo{
-			Size:     int(n),
-			Offset:   offset,
-			Hash:     thisHash,
-			WeakHash: weakHf.Sum32(),
+			Size:   int(n),
+			Offset: offset,
+			Hash:   thisHash,
 		}

 		blocks = append(blocks, b)
 		offset += n

 		hf.Reset()
-		weakHf.Reset()
 	}

 	if len(blocks) == 0 {
@@ -112,14 +99,8 @@ func Blocks(ctx context.Context, r io.Reader, blocksize int, sizehint int64, cou
 	return blocks, nil
 }

-// Validate quickly validates buf against the 32-bit weakHash, if not zero,
-// else against the cryptohash hash, if len(hash)>0. It is satisfied if
-// either hash matches or neither hash is given.
-func Validate(buf, hash []byte, weakHash uint32) bool {
-	if weakHash != 0 && adler32.Checksum(buf) == weakHash {
-		return true
-	}
-
+// Validate validates the hash, if len(hash)>0.
+func Validate(buf, hash []byte) bool {
 	if len(hash) > 0 {
 		hbuf := sha256.Sum256(buf)
 		return bytes.Equal(hbuf[:], hash)
--- a/lib/scanner/blocks_test.go
+++ b/lib/scanner/blocks_test.go
@@ -9,51 +9,40 @@ package scanner
 import (
 	"bytes"
 	"context"
-	"crypto/rand"
 	"crypto/sha256"
 	"fmt"
-	origAdler32 "hash/adler32"
 	mrand "math/rand"
 	"testing"
-	"testing/quick"
-
-	rollingAdler32 "github.com/chmduquesne/rollinghash/adler32"
-	"github.com/syncthing/syncthing/lib/protocol"
 )

 var blocksTestData = []struct {
 	data      []byte
 	blocksize int
 	hash      []string
-	weakhash  []uint32
 }{
 	{
 		[]byte(""), 1024,
 		[]string{
 			"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
 		},
-		[]uint32{0},
 	},
 	{
 		[]byte("contents"), 1024,
 		[]string{
 			"d1b2a59fbea7e20077af9f91b27e95e865061b270be03ff539ab3b73587882e8",
 		},
-		[]uint32{0x0f3a036f},
 	},
 	{
 		[]byte("contents"), 9,
 		[]string{
 			"d1b2a59fbea7e20077af9f91b27e95e865061b270be03ff539ab3b73587882e8",
 		},
-		[]uint32{0x0f3a036f},
 	},
 	{
 		[]byte("contents"), 8,
 		[]string{
 			"d1b2a59fbea7e20077af9f91b27e95e865061b270be03ff539ab3b73587882e8",
 		},
-		[]uint32{0x0f3a036f},
 	},
 	{
 		[]byte("contents"), 7,
@@ -61,7 +50,6 @@ var blocksTestData = []struct {
 			"ed7002b439e9ac845f22357d822bac1444730fbdb6016d3ec9432297b9ec9f73",
 			"043a718774c572bd8a25adbeb1bfcd5c0256ae11cecf9f9c3f925d0e52beaf89",
 		},
-		[]uint32{0x0bcb02fc, 0x00740074},
 	},
 	{
 		[]byte("contents"), 3,
@@ -70,7 +58,6 @@ var blocksTestData = []struct {
 			"e4432baa90819aaef51d2a7f8e148bf7e679610f3173752fabb4dcb2d0f418d3",
 			"44ad63f60af0f6db6fdde6d5186ef78176367df261fa06be3079b6c80c8adba4",
 		},
-		[]uint32{0x02780141, 0x02970148, 0x015d00e8},
 	},
 	{
 		[]byte("conconts"), 3,
@@ -79,7 +66,6 @@ var blocksTestData = []struct {
 			"1143da2bc54c495c4be31d3868785d39ffdfd56df5668f0645d8f14d47647952",
 			"44ad63f60af0f6db6fdde6d5186ef78176367df261fa06be3079b6c80c8adba4",
 		},
-		[]uint32{0x02780141, 0x02780141, 0x015d00e8},
 	},
 	{
 		[]byte("contenten"), 3,
@@ -88,14 +74,13 @@ var blocksTestData = []struct {
 			"e4432baa90819aaef51d2a7f8e148bf7e679610f3173752fabb4dcb2d0f418d3",
 			"e4432baa90819aaef51d2a7f8e148bf7e679610f3173752fabb4dcb2d0f418d3",
 		},
-		[]uint32{0x02780141, 0x02970148, 0x02970148},
 	},
 }

 func TestBlocks(t *testing.T) {
 	for testNo, test := range blocksTestData {
 		buf := bytes.NewBuffer(test.data)
-		blocks, err := Blocks(context.TODO(), buf, test.blocksize, -1, nil, true)
+		blocks, err := Blocks(context.TODO(), buf, test.blocksize, -1, nil)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -119,9 +104,6 @@ func TestBlocks(t *testing.T) {
 				if h := fmt.Sprintf("%x", blocks[i].Hash); h != test.hash[i] {
 					t.Errorf("%d/%d: Incorrect block hash %q != %q", testNo, i, h, test.hash[i])
 				}
-				if h := blocks[i].WeakHash; h != test.weakhash[i] {
-					t.Errorf("%d/%d: Incorrect block weakhash 0x%08x != 0x%08x", testNo, i, h, test.weakhash[i])
-				}

 				i++
 			}
@@ -129,85 +111,10 @@ func TestBlocks(t *testing.T) {
 	}
 }

-func TestAdler32Variants(t *testing.T) {
-	// Verify that the two adler32 functions give matching results for a few
-	// different blocks of data.
-
-	hf1 := origAdler32.New()
-	hf2 := rollingAdler32.New()
-
-	checkFn := func(data []byte) bool {
-		hf1.Write(data)
-		sum1 := hf1.Sum32()
-
-		hf2.Write(data)
-		sum2 := hf2.Sum32()
-
-		hf1.Reset()
-		hf2.Reset()
-
-		// Make sure whatever we use in Validate matches too resp. this
-		// tests gets adjusted if we ever switch the weak hash algo.
-		return sum1 == sum2 && Validate(data, nil, sum1)
-	}
-
-	// protocol block sized data
-	data := make([]byte, protocol.MinBlockSize)
-	for i := 0; i < 5; i++ {
-		rand.Read(data)
-		if !checkFn(data) {
-			t.Errorf("Hash mismatch on block sized data")
-		}
-	}
-
-	// random small blocks
-	if err := quick.Check(checkFn, nil); err != nil {
-		t.Error(err)
-	}
-
-	// rolling should have the same result as the individual blocks
-	// themselves.
-
-	windowSize := 128
-
-	hf3 := rollingAdler32.New()
-	hf3.Write(data[:windowSize])
-
-	for i := windowSize; i < len(data); i++ {
-		if i%windowSize == 0 {
-			// let the reference function catch up
-			window := data[i-windowSize : i]
-			hf1.Reset()
-			hf1.Write(window)
-			hf2.Reset()
-			hf2.Write(window)
-
-			// verify that they are in sync with the rolling function
-			sum1 := hf1.Sum32()
-			sum2 := hf2.Sum32()
-			sum3 := hf3.Sum32()
-			t.Logf("At i=%d, sum2=%08x, sum3=%08x", i, sum2, sum3)
-			if sum2 != sum3 {
-				t.Errorf("Mismatch after roll; i=%d, sum2=%08x, sum3=%08x", i, sum2, sum3)
-				break
-			}
-			if sum1 != sum3 {
-				t.Errorf("Mismatch after roll; i=%d, sum1=%08x, sum3=%08x", i, sum1, sum3)
-				break
-			}
-			if !Validate(window, nil, sum1) {
-				t.Errorf("Validation failure after roll; i=%d", i)
-			}
-		}
-		hf3.Roll(data[i])
-	}
-}
-
 func BenchmarkValidate(b *testing.B) {
 	type block struct {
-		data     []byte
-		hash     [sha256.Size]byte
-		weakhash uint32
+		data []byte
+		hash [sha256.Size]byte
 	}
 	var blocks []block
 	const blocksPerType = 100
@@ -220,16 +127,6 @@ func BenchmarkValidate(b *testing.B) {
 		b.data = make([]byte, 128<<10)
 		r.Read(b.data)
 		b.hash = sha256.Sum256(b.data)
-		b.weakhash = origAdler32.Checksum(b.data)
-		blocks = append(blocks, b)
-	}
-	// Blocks where the hash matches, but the weakhash doesn't.
-	for i := 0; i < blocksPerType; i++ {
-		var b block
-		b.data = make([]byte, 128<<10)
-		r.Read(b.data)
-		b.hash = sha256.Sum256(b.data)
-		b.weakhash = 1 // Zeros causes Validate to skip the weakhash.
 		blocks = append(blocks, b)
 	}

@@ -238,7 +135,7 @@ func BenchmarkValidate(b *testing.B) {

 	for i := 0; i < b.N; i++ {
 		for _, b := range blocks {
-			Validate(b.data, b.hash[:], b.weakhash)
+			Validate(b.data, b.hash[:])
 		}
 	}
 }
--- a/lib/scanner/walk_test.go
+++ b/lib/scanner/walk_test.go
@@ -162,7 +162,7 @@ func TestVerify(t *testing.T) {
 	progress := newByteCounter()
 	defer progress.Close()

-	blocks, err := Blocks(context.TODO(), buf, blocksize, -1, progress, false)
+	blocks, err := Blocks(context.TODO(), buf, blocksize, -1, progress)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -640,7 +640,7 @@ func BenchmarkHashFile(b *testing.B) {
 	b.ResetTimer()

 	for i := 0; i < b.N; i++ {
-		if _, err := HashFile(context.TODO(), "", testFs, testdataName, protocol.MinBlockSize, nil, true); err != nil {
+		if _, err := HashFile(context.TODO(), "", testFs, testdataName, protocol.MinBlockSize, nil); err != nil {
 			b.Fatal(err)
 		}
 	}
--- a/lib/syncthing/internals.go
+++ b/lib/syncthing/internals.go
@@ -42,7 +42,7 @@ func (m *Internals) SetIgnores(folderID string, content []string) error {
 }

 func (m *Internals) DownloadBlock(ctx context.Context, deviceID protocol.DeviceID, folderID string, path string, blockNumber int, blockInfo protocol.BlockInfo, allowFromTemporary bool) ([]byte, error) {
-	return m.model.RequestGlobal(ctx, deviceID, folderID, path, int(blockNumber), blockInfo.Offset, blockInfo.Size, blockInfo.Hash, blockInfo.WeakHash, allowFromTemporary)
+	return m.model.RequestGlobal(ctx, deviceID, folderID, path, int(blockNumber), blockInfo.Offset, blockInfo.Size, blockInfo.Hash, allowFromTemporary)
 }

 func (m *Internals) BlockAvailability(folderID string, file protocol.FileInfo, block protocol.BlockInfo) ([]model.Availability, error) {
--- a/lib/syncthing/syncthing.go
+++ b/lib/syncthing/syncthing.go
@@ -177,7 +177,7 @@ func (a *App) startup() error {
 		}()
 	}

-	perf := ur.CpuBench(context.Background(), 3, 150*time.Millisecond, true)
+	perf := ur.CpuBench(context.Background(), 3, 150*time.Millisecond)
 	l.Infof("Hashing performance is %.02f MB/s", perf)

 	if err := db.UpdateSchema(a.ll); err != nil {
--- a/lib/ur/contract/contract.go
+++ b/lib/ur/contract/contract.go
@@ -111,8 +111,6 @@ type Report struct {
 		ConflictsOther          int            `json:"conflictsOther,omitempty" metric:"folder_feature{feature=ConflictsOther},summary" since:"3"`
 		DisableSparseFiles      int            `json:"disableSparseFiles,omitempty" metric:"folder_feature{feature=DisableSparseFiles},summary" since:"3"`
 		DisableTempIndexes      int            `json:"disableTempIndexes,omitempty" metric:"folder_feature{feature=DisableTempIndexes},summary" since:"3"`
-		AlwaysWeakHash          int            `json:"alwaysWeakHash,omitempty" metric:"folder_feature{feature=AlwaysWeakhash},summary" since:"3"`
-		CustomWeakHashThreshold int            `json:"customWeakHashThreshold,omitempty" metric:"folder_feature{feature=CustomWeakhashThreshold},summary" since:"3"`
 		FsWatcherEnabled        int            `json:"fsWatcherEnabled,omitempty" metric:"folder_feature{feature=FSWatcherEnabled},summary" since:"3"`
 		PullOrder               map[string]int `json:"pullOrder,omitempty" metric:"folder_pull_order,summaryVec:order" since:"3"`
 		FilesystemType          map[string]int `json:"filesystemType,omitempty" metric:"folder_file_system_type,summaryVec:type" since:"3"`
@@ -152,13 +150,12 @@ type Report struct {
 	} `json:"guiStats,omitempty" since:"3"`

 	BlockStats struct {
-		Total             int `json:"total,omitempty" metric:"blocks_processed_total,gauge" since:"3"`
-		Renamed           int `json:"renamed,omitempty" metric:"blocks_processed{source=renamed},gauge" since:"3"`
-		Reused            int `json:"reused,omitempty" metric:"blocks_processed{source=reused},gauge" since:"3"`
-		Pulled            int `json:"pulled,omitempty" metric:"blocks_processed{source=pulled},gauge" since:"3"`
-		CopyOrigin        int `json:"copyOrigin,omitempty" metric:"blocks_processed{source=copy_origin},gauge" since:"3"`
-		CopyOriginShifted int `json:"copyOriginShifted,omitempty" metric:"blocks_processed{source=copy_origin_shifted},gauge" since:"3"`
-		CopyElsewhere     int `json:"copyElsewhere,omitempty" metric:"blocks_processed{source=copy_elsewhere},gauge" since:"3"`
+		Total         int `json:"total,omitempty" metric:"blocks_processed_total,gauge" since:"3"`
+		Renamed       int `json:"renamed,omitempty" metric:"blocks_processed{source=renamed},gauge" since:"3"`
+		Reused        int `json:"reused,omitempty" metric:"blocks_processed{source=reused},gauge" since:"3"`
+		Pulled        int `json:"pulled,omitempty" metric:"blocks_processed{source=pulled},gauge" since:"3"`
+		CopyOrigin    int `json:"copyOrigin,omitempty" metric:"blocks_processed{source=copy_origin},gauge" since:"3"`
+		CopyElsewhere int `json:"copyElsewhere,omitempty" metric:"blocks_processed{source=copy_elsewhere},gauge" since:"3"`
 	} `json:"blockStats,omitempty" since:"3"`

 	TransportStats map[string]int `json:"transportStats,omitempty" since:"3"`
@@ -175,9 +172,6 @@ type Report struct {
 		Stars           int `json:"stars,omitempty" metric:"folder_ignore_lines{kind=stars},summary" since:"3"`
 	} `json:"ignoreStats,omitempty" since:"3"`

-	// V3 fields added late in the RC
-	WeakHashEnabled bool `json:"weakHashEnabled,omitempty" metric:"-" since:"3"` // Deprecated and not provided client-side anymore
-
 	// Added in post processing
 	Received     time.Time `json:"received,omitempty"`
 	Date         string    `json:"date,omitempty"`
--- a/lib/ur/usage_report.go
+++ b/lib/ur/usage_report.go
@@ -116,8 +116,8 @@ func (s *Service) reportData(ctx context.Context, urVersion int, preview bool) (
 	report.TotMiB = int(totBytes / 1024 / 1024)
 	report.FolderMaxMiB = int(maxBytes / 1024 / 1024)
 	report.MemoryUsageMiB = int((mem.Sys - mem.HeapReleased) / 1024 / 1024)
-	report.SHA256Perf = CpuBench(ctx, 5, 125*time.Millisecond, false)
-	report.HashPerf = CpuBench(ctx, 5, 125*time.Millisecond, true)
+	report.SHA256Perf = CpuBench(ctx, 5, 125*time.Millisecond)
+	report.HashPerf = report.SHA256Perf
 	report.MemorySize = int(memorySize() / 1024 / 1024)
 	report.NumCPU = runtime.NumCPU()

@@ -252,11 +252,6 @@ func (s *Service) reportData(ctx context.Context, urVersion int, preview bool) (
 			if cfg.DisableTempIndexes {
 				report.FolderUsesV3.DisableTempIndexes++
 			}
-			if cfg.WeakHashThresholdPct < 0 {
-				report.FolderUsesV3.AlwaysWeakHash++
-			} else if cfg.WeakHashThresholdPct != 25 {
-				report.FolderUsesV3.CustomWeakHashThreshold++
-			}
 			if cfg.FSWatcherEnabled {
 				report.FolderUsesV3.FsWatcherEnabled++
 			}
@@ -443,7 +438,7 @@ var (
 )

 // CpuBench returns CPU performance as a measure of single threaded SHA-256 MiB/s
-func CpuBench(ctx context.Context, iterations int, duration time.Duration, useWeakHash bool) float64 {
+func CpuBench(ctx context.Context, iterations int, duration time.Duration) float64 {
 	blocksResultMut.Lock()
 	defer blocksResultMut.Unlock()

@@ -454,7 +449,7 @@ func CpuBench(ctx context.Context, iterations int, duration time.Duration, useWe

 	var perf float64
 	for i := 0; i < iterations; i++ {
-		if v := cpuBenchOnce(ctx, duration, useWeakHash, bs); v > perf {
+		if v := cpuBenchOnce(ctx, duration, bs); v > perf {
 			perf = v
 		}
 	}
@@ -467,13 +462,13 @@ func CpuBench(ctx context.Context, iterations int, duration time.Duration, useWe
 	return perf
 }

-func cpuBenchOnce(ctx context.Context, duration time.Duration, useWeakHash bool, bs []byte) float64 {
+func cpuBenchOnce(ctx context.Context, duration time.Duration, bs []byte) float64 {
 	t0 := time.Now()
 	b := 0
 	var err error
 	for time.Since(t0) < duration {
 		r := bytes.NewReader(bs)
-		blocksResult, err = scanner.Blocks(ctx, r, protocol.MinBlockSize, int64(len(bs)), nil, useWeakHash)
+		blocksResult, err = scanner.Blocks(ctx, r, protocol.MinBlockSize, int64(len(bs)), nil)
 		if err != nil {
 			return 0 // Context done
 		}
--- a/lib/weakhash/benchmark_test.go
+++ b/lib/weakhash/benchmark_test.go
@@ -1,151 +0,0 @@
-// Copyright (C) 2016 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package weakhash
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"hash"
-	vadler32 "hash/adler32"
-	"io"
-	"math/rand"
-	"os"
-	"testing"
-
-	"github.com/chmduquesne/rollinghash/adler32"
-	"github.com/chmduquesne/rollinghash/bozo32"
-	"github.com/chmduquesne/rollinghash/buzhash32"
-	"github.com/chmduquesne/rollinghash/buzhash64"
-)
-
-const (
-	testFile = "../model/testdata/tmpfile"
-	size     = 128 << 10
-)
-
-func BenchmarkFind1MFile(b *testing.B) {
-	b.ReportAllocs()
-	b.SetBytes(1 << 20)
-	for i := 0; i < b.N; i++ {
-		fd, err := os.Open(testFile)
-		if err != nil {
-			b.Fatal(err)
-		}
-		_, err = Find(context.Background(), fd, []uint32{0, 1, 2}, size)
-		if err != nil {
-			b.Fatal(err)
-		}
-		fd.Close()
-	}
-}
-
-type RollingHash interface {
-	hash.Hash
-	Roll(byte)
-}
-
-func BenchmarkBlock(b *testing.B) {
-	tests := []struct {
-		name string
-		hash hash.Hash
-	}{
-		{
-			"adler32", adler32.New(),
-		},
-		{
-			"bozo32", bozo32.New(),
-		},
-		{
-			"buzhash32", buzhash32.New(),
-		},
-		{
-			"buzhash64", buzhash64.New(),
-		},
-		{
-			"vanilla-adler32", vadler32.New(),
-		},
-	}
-
-	sizes := []int64{128 << 10, 16 << 20}
-
-	buf := make([]byte, 16<<20)
-	rand.Read(buf)
-
-	for _, testSize := range sizes {
-		for _, test := range tests {
-			b.Run(test.name+"-"+fmt.Sprint(testSize), func(bb *testing.B) {
-				bb.Run("", func(bbb *testing.B) {
-					bbb.ResetTimer()
-					for i := 0; i < bbb.N; i++ {
-						lr := io.LimitReader(bytes.NewReader(buf), testSize)
-						n, err := io.Copy(test.hash, lr)
-						if err != nil {
-							bbb.Error(err)
-						}
-						if n != testSize {
-							bbb.Errorf("%d != %d", n, testSize)
-						}
-
-						test.hash.Sum(nil)
-						test.hash.Reset()
-					}
-
-					bbb.SetBytes(testSize)
-					bbb.ReportAllocs()
-				})
-			})
-		}
-	}
-}
-
-func BenchmarkRoll(b *testing.B) {
-	tests := []struct {
-		name string
-		hash RollingHash
-	}{
-		{
-			"adler32", adler32.New(),
-		},
-		{
-			"bozo32", bozo32.New(),
-		},
-		{
-			"buzhash32", buzhash32.New(),
-		},
-		{
-			"buzhash64", buzhash64.New(),
-		},
-	}
-
-	sizes := []int64{128 << 10, 16 << 20}
-
-	for _, testSize := range sizes {
-		for _, test := range tests {
-			b.Run(test.name+"-"+fmt.Sprint(testSize), func(bb *testing.B) {
-				bb.Run("", func(bbb *testing.B) {
-					data := make([]byte, testSize)
-
-					if _, err := test.hash.Write(data); err != nil {
-						bbb.Error(err)
-					}
-
-					bbb.ResetTimer()
-
-					for i := 0; i < bbb.N; i++ {
-						for j := int64(0); j <= testSize; j++ {
-							test.hash.Roll('a')
-						}
-					}
-
-					bbb.SetBytes(testSize)
-					bbb.ReportAllocs()
-				})
-			})
-		}
-	}
-}
--- a/lib/weakhash/weakhash.go
+++ b/lib/weakhash/weakhash.go
@@ -1,118 +0,0 @@
-// Copyright (C) 2016 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package weakhash
-
-import (
-	"bufio"
-	"context"
-	"io"
-
-	"github.com/chmduquesne/rollinghash/adler32"
-)
-
-const (
-	Size = 4
-
-	// don't track more hits than this for any given weakhash
-	maxWeakhashFinderHits = 10
-)
-
-// Find finds all the blocks of the given size within io.Reader that matches
-// the hashes provided, and returns a hash -> slice of offsets within reader
-// map, that produces the same weak hash.
-func Find(ctx context.Context, ir io.Reader, hashesToFind []uint32, size int) (map[uint32][]int64, error) {
-	if ir == nil || len(hashesToFind) == 0 {
-		return nil, nil
-	}
-
-	r := bufio.NewReader(ir)
-	hf := adler32.New()
-
-	n, err := io.CopyN(hf, r, int64(size))
-	if err == io.EOF {
-		return nil, nil
-	}
-	if err != nil {
-		return nil, err
-	}
-	if n != int64(size) {
-		return nil, io.ErrShortBuffer
-	}
-
-	offsets := make(map[uint32][]int64)
-	for _, hashToFind := range hashesToFind {
-		offsets[hashToFind] = make([]int64, 0, maxWeakhashFinderHits)
-	}
-
-	var i int64
-	var hash uint32
-	for {
-		select {
-		case <-ctx.Done():
-			return nil, ctx.Err()
-		default:
-		}
-
-		hash = hf.Sum32()
-		if existing, ok := offsets[hash]; ok && len(existing) < maxWeakhashFinderHits {
-			offsets[hash] = append(existing, i)
-		}
-		i++
-
-		bt, err := r.ReadByte()
-		if err == io.EOF {
-			break
-		} else if err != nil {
-			return offsets, err
-		}
-		hf.Roll(bt)
-	}
-	return offsets, nil
-}
-
-func NewFinder(ctx context.Context, ir io.ReadSeeker, size int, hashesToFind []uint32) (*Finder, error) {
-	offsets, err := Find(ctx, ir, hashesToFind, size)
-	if err != nil {
-		return nil, err
-	}
-
-	return &Finder{
-		reader:  ir,
-		size:    size,
-		offsets: offsets,
-	}, nil
-}
-
-type Finder struct {
-	reader  io.ReadSeeker
-	size    int
-	offsets map[uint32][]int64
-}
-
-// Iterate iterates all available blocks that matches the provided hash, reads
-// them into buf, and calls the iterator function. The iterator function should
-// return whether it wishes to continue iterating.
-func (h *Finder) Iterate(hash uint32, buf []byte, iterFunc func(int64) bool) (bool, error) {
-	if h == nil || hash == 0 || len(buf) != h.size {
-		return false, nil
-	}
-
-	for _, offset := range h.offsets[hash] {
-		_, err := h.reader.Seek(offset, io.SeekStart)
-		if err != nil {
-			return false, err
-		}
-		_, err = h.reader.Read(buf)
-		if err != nil {
-			return false, err
-		}
-		if !iterFunc(offset) {
-			return true, nil
-		}
-	}
-	return false, nil
-}
--- a/lib/weakhash/weakhash_test.go
+++ b/lib/weakhash/weakhash_test.go
@@ -1,68 +0,0 @@
-// Copyright (C) 2016 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-// The existence of this file means we get 0% test coverage rather than no
-// test coverage at all. Remove when implementing an actual test.
-
-package weakhash
-
-import (
-	"bytes"
-	"context"
-	"io"
-	"os"
-	"reflect"
-	"testing"
-)
-
-var payload = []byte("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")
-
-func TestFinder(t *testing.T) {
-	f, err := os.CreateTemp("", "")
-	if err != nil {
-		t.Error(err)
-	}
-	defer os.Remove(f.Name())
-	defer f.Close()
-
-	if _, err := f.Write(payload); err != nil {
-		t.Error(err)
-	}
-	if _, err := f.Seek(0, io.SeekStart); err != nil {
-		t.Error(err)
-	}
-
-	hashes := []uint32{65143183, 65798547}
-	finder, err := NewFinder(context.Background(), f, 4, hashes)
-	if err != nil {
-		t.Error(err)
-	}
-
-	expected := map[uint32][]int64{
-		65143183: {1, 27, 53, 79},
-		65798547: {2, 28, 54, 80},
-	}
-	actual := make(map[uint32][]int64)
-
-	b := make([]byte, Size)
-
-	for _, hash := range hashes {
-		_, err := finder.Iterate(hash, b[:4], func(offset int64) bool {
-			if !bytes.Equal(b, payload[offset:offset+4]) {
-				t.Errorf("Not equal at %d: %s != %s", offset, string(b), string(payload[offset:offset+4]))
-			}
-			actual[hash] = append(actual[hash], offset)
-			return true
-		})
-		if err != nil {
-			t.Error(err)
-		}
-	}
-
-	if !reflect.DeepEqual(actual, expected) {
-		t.Errorf("Not equal: %#v != %#v", actual, expected)
-	}
-}
--- a/proto/bep/bep.proto
+++ b/proto/bep/bep.proto
@@ -145,7 +145,7 @@ message BlockInfo {
  bytes hash = 3;
  int64 offset = 1;
  int32 size = 2;
-  uint32 weak_hash = 4;
+  reserved 4;
 }

 message Vector {
@@ -203,8 +203,8 @@ message Request {
  int32 size = 5;
  bytes hash = 6;
  bool from_temporary = 7;
-  uint32 weak_hash = 8;
  int32 block_no = 9;
+  reserved 8;
 }

 // Response
--- a/test/h1/config.xml
+++ b/test/h1/config.xml
@@ -24,7 +24,6 @@
        <disableSparseFiles>false</disableSparseFiles>
        <disableTempIndexes>false</disableTempIndexes>
        <paused>false</paused>
-        <weakHashThresholdPct>25</weakHashThresholdPct>
        <markerName>.stfolder</markerName>
        <copyOwnershipFromParent>false</copyOwnershipFromParent>
        <modTimeWindowS>0</modTimeWindowS>
@@ -153,7 +152,6 @@
            <disableSparseFiles>false</disableSparseFiles>
            <disableTempIndexes>false</disableTempIndexes>
            <paused>false</paused>
-            <weakHashThresholdPct>25</weakHashThresholdPct>
            <markerName>.stfolder</markerName>
            <copyOwnershipFromParent>false</copyOwnershipFromParent>
            <modTimeWindowS>0</modTimeWindowS>
--- a/test/h2/config.xml
+++ b/test/h2/config.xml
@@ -24,7 +24,6 @@
        <disableSparseFiles>false</disableSparseFiles>
        <disableTempIndexes>false</disableTempIndexes>
        <paused>false</paused>
-        <weakHashThresholdPct>25</weakHashThresholdPct>
        <markerName>.stfolder</markerName>
        <copyOwnershipFromParent>false</copyOwnershipFromParent>
        <modTimeWindowS>0</modTimeWindowS>
@@ -151,7 +150,6 @@
            <disableSparseFiles>false</disableSparseFiles>
            <disableTempIndexes>false</disableTempIndexes>
            <paused>false</paused>
-            <weakHashThresholdPct>25</weakHashThresholdPct>
            <markerName>.stfolder</markerName>
            <copyOwnershipFromParent>false</copyOwnershipFromParent>
            <modTimeWindowS>0</modTimeWindowS>
--- a/test/h3/config.xml
+++ b/test/h3/config.xml
@@ -20,7 +20,6 @@
        <disableSparseFiles>false</disableSparseFiles>
        <disableTempIndexes>false</disableTempIndexes>
        <paused>false</paused>
-        <weakHashThresholdPct>25</weakHashThresholdPct>
        <markerName>.stfolder</markerName>
        <copyOwnershipFromParent>false</copyOwnershipFromParent>
        <modTimeWindowS>0</modTimeWindowS>
@@ -50,7 +49,6 @@
        <disableSparseFiles>false</disableSparseFiles>
        <disableTempIndexes>false</disableTempIndexes>
        <paused>false</paused>
-        <weakHashThresholdPct>25</weakHashThresholdPct>
        <markerName>.stfolder</markerName>
        <copyOwnershipFromParent>false</copyOwnershipFromParent>
        <modTimeWindowS>0</modTimeWindowS>
--- a/test/h4/config.xml
+++ b/test/h4/config.xml
@@ -17,7 +17,6 @@
        <disableSparseFiles>false</disableSparseFiles>
        <disableTempIndexes>false</disableTempIndexes>
        <paused>false</paused>
-        <weakHashThresholdPct>25</weakHashThresholdPct>
        <markerName>.stfolder</markerName>
        <copyOwnershipFromParent>false</copyOwnershipFromParent>
        <modTimeWindowS>0</modTimeWindowS>