fix: preserve remote rollback options and reject stale read quorums

Signed-off-by: Feng Ruohang <rh@vonng.com>

cmd/erasure-object.go

@@ -935,6 +935,16 @@ func (er erasureObjects) getObjectFileInfo(ctx context.Context, bucket, object s
 		if err != nil {
 			return FileInfo{}, nil, nil, time.Time{}, "", err
 		}
+		for i, meta := range metaArr {
+			if errs[i] == nil && meta.IsValid() && meta.VersionID == fi.VersionID && meta.ModTime.After(fi.ModTime) {
+				// A quorum of an older generation does not resolve a later
+				// overwrite of the same version. Keep the uncertainty visible
+				// instead of silently rolling the object back on reads.
+				return FileInfo{}, nil, nil, time.Time{}, "", InsufficientReadQuorum{
+					Err: errErasureReadQuorum, Type: RQInconsistentMeta,
+				}
+			}
+		}
 
 		onlineMeta := make([]FileInfo, len(metaArr))
 		for i, disk := range onlineDisks {

cmd/erasure-read-generation_test.go

@@ -58,9 +58,20 @@ func TestPoolsReadGenerationConflictDoesNotExposeOldValue(t *testing.T) {
 	ctx, cancel := context.WithCancel(t.Context())
 	defer cancel()
 	router := initTestAPIEndPoints(z, []string{"GetObject", "HeadObject"})
-	for broken := range 2 {
-		t.Run(fmt.Sprintf("broken-pool-%d", broken), func(t *testing.T) {
-			object := fmt.Sprintf("conflict-%d", broken)
+	for _, tc := range []struct {
+		pool int
+		mode string
+	}{
+		{0, "split"},
+		{1, "split"},
+		{0, "older-quorum"},
+		{1, "older-quorum"},
+		{0, "newer-quorum"},
+		{1, "newer-quorum"},
+	} {
+		t.Run(fmt.Sprintf("%s/pool-%d", tc.mode, tc.pool), func(t *testing.T) {
+			broken := tc.pool
+			object := fmt.Sprintf("conflict-%s-%d", tc.mode, broken)
 			base := UTCNow().Add(-time.Hour)
 			putConsistencyObject(t, z, bucket, object, 1-broken, "old-acknowledged", ObjectOptions{MTime: base})
 			set := z.serverPools[broken].getHashedSet(object)
@@ -70,7 +81,20 @@ func TestPoolsReadGenerationConflictDoesNotExposeOldValue(t *testing.T) {
 				putConsistencyObject(t, z, bucket, object, broken, fmt.Sprintf("newer-%d", generation),
 					ObjectOptions{MTime: base.Add(time.Duration(generation+1) * time.Minute)})
 				for i, disk := range disks {
-					if i%4 != generation {
+					g := i % 4
+					switch tc.mode {
+					case "older-quorum":
+						g = 0
+						if i >= len(disks)-3 {
+							g = i - (len(disks) - 3) + 1
+						}
+					case "newer-quorum":
+						g = 3
+						if i < 3 {
+							g = i
+						}
+					}
+					if g != generation {
 						continue
 					}
 					buf, err := disk.ReadAll(ctx, bucket, pathJoin(object, xlStorageFormatFile))
@@ -88,8 +112,15 @@ func TestPoolsReadGenerationConflictDoesNotExposeOldValue(t *testing.T) {
 			for _, version := range []string{"", nullVersionID} {
 				for _, method := range []string{http.MethodHead, http.MethodGet} {
 					rec := consistencyRequest(t, router, method, bucket, object, version)
-					if rec.Code != http.StatusServiceUnavailable {
-						t.Errorf("%s version=%q exposed an old value or false absence: status=%d body=%q", method, version, rec.Code, rec.Body.String())
+					want := http.StatusServiceUnavailable
+					if tc.mode == "newer-quorum" {
+						want = http.StatusOK
+					}
+					if rec.Code != want {
+						t.Errorf("%s version=%q: want status=%d, got=%d body=%q", method, version, want, rec.Code, rec.Body.String())
+					}
+					if want == http.StatusOK && method == http.MethodGet && rec.Body.String() != "newer-3" {
+						t.Errorf("latest quorum did not return its payload: %q", rec.Body.String())
 					}
 				}
 			}

cmd/object-retention-overwrite_test.go

@@ -244,6 +244,26 @@ func TestPoolsObjectLockOverwrite(t *testing.T) {
 					}
 				}
 				defer conditionalPutPool(t, z, key, 0)()
+				var source string
+				var copyInfo ObjectInfo
+				if op == "copy" || op == "self-copy" {
+					source = key
+					if op == "copy" {
+						source = "source-" + state
+						putConsistencyObject(t, z, bucket, source, 0, "replacement", ObjectOptions{Versioned: true})
+					}
+					// Resolve the source before the pool becomes unreadable.
+					// The destination must still reject a previously read source.
+					gr, gerr := z.GetObjectNInfo(ctx, bucket, source, nil, nil, ObjectOptions{})
+					if gerr != nil {
+						t.Fatal(gerr)
+					}
+					defer gr.Close()
+					copyInfo = gr.ObjInfo
+					copyInfo.metadataOnly = op == "self-copy"
+					copyInfo.PutObjReader = mustGetPutObjReader(t, gr, copyInfo.Size, "", "")
+					copyInfo.Reader = copyInfo.PutObjReader.Reader
+				}
 				var restore func()
 				if state == "unreadable" {
 					restore = conditionalPutSwapDisks(z.serverPools[1], key, func(d StorageAPI) StorageAPI {
@@ -257,22 +277,8 @@ func TestPoolsObjectLockOverwrite(t *testing.T) {
 				case "put":
 					_, writeErr = z.PutObject(ctx, bucket, key, mustGetPutObjReader(t, bytes.NewBufferString("replacement"), 11, "", ""), opts)
 				case "copy", "self-copy":
-					source := key
-					if op == "copy" {
-						source = "source-" + state
-						putConsistencyObject(t, z, bucket, source, 0, "replacement", ObjectOptions{Versioned: true})
-					}
-					gr, gerr := z.GetObjectNInfo(ctx, bucket, source, nil, nil, ObjectOptions{})
-					if gerr != nil {
-						t.Fatal(gerr)
-					}
-					defer gr.Close()
-					info := gr.ObjInfo
-					info.UserDefined = opts.UserDefined
-					info.metadataOnly = op == "self-copy"
-					info.PutObjReader = mustGetPutObjReader(t, gr, info.Size, "", "")
-					info.Reader = info.PutObjReader.Reader
-					_, writeErr = z.CopyObject(ctx, bucket, source, bucket, key, info, ObjectOptions{VersionID: nullVersionID}, opts)
+					copyInfo.UserDefined = opts.UserDefined
+					_, writeErr = z.CopyObject(ctx, bucket, source, bucket, key, copyInfo, ObjectOptions{VersionID: nullVersionID}, opts)
 				case "multipart":
 					id, parts := multipartConditionUpload(t, z, bucket, key, 0, opts)
 					_, writeErr = z.CompleteMultipartUpload(ctx, bucket, key, id, parts, ObjectOptions{Versioned: true})

cmd/rename-cancellation_test.go

@@ -234,6 +234,10 @@ func (d gatedRenameDisk) WriteMetadata(ctx context.Context, ov, volume, path str
 	return d.client.WriteMetadata(ctx, ov, volume, path, fi)
 }
 
+func (d gatedRenameDisk) DeleteVersion(ctx context.Context, volume, path string, fi FileInfo, force bool, opts DeleteOptions) error {
+	return d.client.DeleteVersion(ctx, volume, path, fi, force, opts)
+}
+
 // Use real disk commits behind the real RPC client. The barrier fixes the
 // order: every commit has started, then cancellation, then remote completion.
 func TestRenameCancellationKeepsLockUntilRollback(t *testing.T) {
@@ -267,6 +271,23 @@ func TestRenameCancellationKeepsLockUntilRollback(t *testing.T) {
 			}
 			copyInfo.metadataOnly = true
 			copyInfo.UserDefined["copy-test"] = "canceled"
+			// Exercise the production rollback handler and wire options as
+			// well as the client. A local DeleteVersion bypasses that boundary.
+			globalLocalDrivesMu.Lock()
+			previousSets, previousMap := globalLocalSetDrives, globalLocalDrivesMap
+			globalLocalSetDrives = nil
+			globalLocalDrivesMap = make(map[string]StorageAPI)
+			for _, pool := range z.serverPools {
+				for _, disk := range pool.getHashedSet(object).getDisks() {
+					globalLocalDrivesMap[disk.Endpoint().String()] = disk
+				}
+			}
+			globalLocalDrivesMu.Unlock()
+			t.Cleanup(func() {
+				globalLocalDrivesMu.Lock()
+				globalLocalSetDrives, globalLocalDrivesMap = previousSets, previousMap
+				globalLocalDrivesMu.Unlock()
+			})
 			tg, err := grid.SetupTestGrid(2)
 			if err != nil {
 				t.Fatal(err)
@@ -285,6 +306,10 @@ func TestRenameCancellationKeepsLockUntilRollback(t *testing.T) {
 				wrapped := append([]StorageAPI(nil), disks...)
 				for i, disk := range disks {
 					route := fmt.Sprintf("/cancel-rollback/%d/%d", pi, i)
+					server := storageRESTServer{endpoint: disk.Endpoint()}
+					if err := storageDeleteVersionRPC.Register(tg.Managers[1], server.DeleteVersionHandler, route); err != nil {
+						t.Fatal(err)
+					}
 					handle := func(p *RenameDataHandlerParams) (*RenameDataResp, *grid.RemoteErr) {
 						entered <- struct{}{}
 						<-release

cmd/storage-rest-server-guard_test.go

@@ -102,14 +102,9 @@ func TestGuardedStorageCoversEveryPathMethod(t *testing.T) {
 	}
 }
 
-// TestGuardChecksUnreachableFields pins the guard on path fields that exist on
-// the wire but that no handler currently reads, so an end-to-end test cannot
-// observe them. DeleteVersionHandler hardcodes `opts := DeleteOptions{}` and
-// discards p.Opts, which means DeleteOptions.OldDataDir - a value that reaches
-// renameAll() with no containment of its own - is unreachable by accident
-// rather than by design. If someone later plumbs p.Opts through, the guard is
-// already there; this test is what stops it from being removed as "dead".
-func TestGuardChecksUnreachableFields(t *testing.T) {
+// OldDataDir can reach renameAll during rollback. Guard it independently of
+// which handlers currently forward deletion options.
+func TestGuardChecksDeleteOptionPaths(t *testing.T) {
 	g := guardedStorage{poisonStorage{}}
 	ctx := context.Background()
 

cmd/storage-rest-server.go

@@ -415,8 +415,7 @@ func (s *storageRESTServer) DeleteVersionHandler(p *DeleteVersionHandlerParams)
 	filePath := p.FilePath
 	forceDelMarker := p.ForceDelMarker
 
-	opts := DeleteOptions{}
-	err := s.getStorage().DeleteVersion(context.Background(), volume, filePath, p.FI, forceDelMarker, opts)
+	err := s.getStorage().DeleteVersion(context.Background(), volume, filePath, p.FI, forceDelMarker, p.Opts)
 	return np, grid.NewRemoteErr(err)
 }
 

cmd/storage-rest-traversal_test.go

@@ -231,12 +231,9 @@ func TestStorageRESTTraversalRejected(t *testing.T) {
 			{"DeleteVersion-DataDir", func() error {
 				return restClient.DeleteVersion(ctx, "foo", "obj", badFI(p), false, DeleteOptions{})
 			}},
-			// DeleteOptions.OldDataDir is guarded too, but cannot be exercised
-			// from here: DeleteVersionHandler hardcodes `opts := DeleteOptions{}`
-			// and never reads the wire value, so the field is unreachable today.
-			// That is an accidental mitigation, not a control - see
-			// TestGuardChecksUnreachableFields for the unit-level assertion that
-			// the guard is ready if anyone ever plumbs it through.
+			{"DeleteVersion-OldDataDir", func() error {
+				return restClient.DeleteVersion(ctx, "foo", "obj", badFI(""), false, DeleteOptions{UndoWrite: true, OldDataDir: p})
+			}},
 			{"RenameData-srcPath", func() error {
 				_, err := restClient.RenameData(ctx, "foo", p, badFI(""), "bar", "dst", RenameOptions{})
 				return err