allow preserving legacyXLv1 with inline data format (#11951)

current master breaks this important requirement
we need to preserve legacyXLv1 format, this is simply
ignored and overwritten causing a myriad of issues
by leaving stale files on the namespace etc.

for now lets still use the two-phase approach of
writing to `tmp` and then renaming the content to
the actual namespace.

.github/workflows/go.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         go-version: [1.16.x]
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-latest, windows-latest]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
@@ -21,14 +21,6 @@ jobs:
       - uses: actions/setup-go@v2
         with:
           go-version: ${{ matrix.go-version }}
-      - name: Build on ${{ matrix.os }}
-        if: matrix.os == 'macos-latest'
-        env:
-          CGO_ENABLED: 0
-          GO111MODULE: on
-        run: |
-          make
-          make test-race
       - name: Build on ${{ matrix.os }}
         if: matrix.os == 'windows-latest'
         env:

cmd/erasure-healing.go

@@ -376,9 +376,14 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
 		partsMetadata[i] = cleanFileInfo(latestMeta)
 	}
 
-	dataDir := latestMeta.DataDir
+	// source data dir shall be empty in case of XLV1
+	// differentiate it with dstDataDir for readability
+	// srcDataDir is the one used with newBitrotReader()
+	// to read existing content.
+	srcDataDir := latestMeta.DataDir
+	dstDataDir := latestMeta.DataDir
 	if latestMeta.XLV1 {
-		dataDir = migrateDataDir
+		dstDataDir = migrateDataDir
 	}
 
 	var inlineBuffers []*bytes.Buffer
@@ -419,10 +424,7 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
 					continue
 				}
 				checksumInfo := copyPartsMetadata[i].Erasure.GetChecksumInfo(partNumber)
-				partPath := pathJoin(object, dataDir, fmt.Sprintf("part.%d", partNumber))
-				if latestMeta.XLV1 {
-					partPath = pathJoin(object, fmt.Sprintf("part.%d", partNumber))
-				}
+				partPath := pathJoin(object, srcDataDir, fmt.Sprintf("part.%d", partNumber))
 				readers[i] = newBitrotReader(disk, partsMetadata[i].Data, bucket, partPath, tillOffset, checksumAlgo, checksumInfo.Hash, erasure.ShardSize())
 			}
 			writers := make([]io.Writer, len(outDatedDisks))
@@ -430,7 +432,7 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
 				if disk == OfflineDisk {
 					continue
 				}
-				partPath := pathJoin(tmpID, dataDir, fmt.Sprintf("part.%d", partNumber))
+				partPath := pathJoin(tmpID, dstDataDir, fmt.Sprintf("part.%d", partNumber))
 				if len(inlineBuffers) > 0 {
 					inlineBuffers[i] = bytes.NewBuffer(make([]byte, 0, erasure.ShardFileSize(latestMeta.Size)))
 					writers[i] = newStreamingBitrotWriterBuffer(inlineBuffers[i], DefaultBitrotAlgorithm, erasure.ShardSize())
@@ -460,7 +462,7 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
 					continue
 				}
 
-				partsMetadata[i].DataDir = dataDir
+				partsMetadata[i].DataDir = dstDataDir
 				partsMetadata[i].AddObjectPart(partNumber, "", partSize, partActualSize)
 				partsMetadata[i].Erasure.AddChecksumInfo(ChecksumInfo{
 					PartNumber: partNumber,
@@ -481,25 +483,6 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
 		}
 	}
 
-	if len(inlineBuffers) > 0 {
-		// Write directly...
-		if outDatedDisks, err = writeUniqueFileInfo(ctx, outDatedDisks, bucket, object, partsMetadata, diskCount(outDatedDisks)); err != nil {
-			logger.LogIf(ctx, err)
-			return result, toObjectErr(err, bucket, object)
-		}
-		result.ObjectSize = latestMeta.Size
-		for _, disk := range outDatedDisks {
-			if disk == OfflineDisk {
-				continue
-			}
-			for i, v := range result.Before.Drives {
-				if v.Endpoint == disk.String() {
-					result.After.Drives[i].State = madmin.DriveStateOk
-				}
-			}
-		}
-		return result, nil
-	}
 	defer er.deleteObject(context.Background(), minioMetaTmpBucket, tmpID, len(storageDisks)/2+1)
 
 	// Generate and write `xl.meta` generated from other disks.

cmd/erasure-metadata.go

@@ -279,6 +279,37 @@ func pickValidFileInfo(ctx context.Context, metaArr []FileInfo, modTime time.Tim
 	return findFileInfoInQuorum(ctx, metaArr, modTime, quorum)
 }
 
+// Rename metadata content to destination location for each disk concurrently.
+func renameFileInfo(ctx context.Context, disks []StorageAPI, srcBucket, srcEntry, dstBucket, dstEntry string, quorum int) ([]StorageAPI, error) {
+	ignoredErr := []error{errFileNotFound}
+
+	g := errgroup.WithNErrs(len(disks))
+
+	// Rename file on all underlying storage disks.
+	for index := range disks {
+		index := index
+		g.Go(func() error {
+			if disks[index] == nil {
+				return errDiskNotFound
+			}
+			if err := disks[index].RenameData(ctx, srcBucket, srcEntry, "", dstBucket, dstEntry); err != nil {
+				if !IsErrIgnored(err, ignoredErr...) {
+					return err
+				}
+			}
+			return nil
+		}, index)
+	}
+
+	// Wait for all renames to finish.
+	errs := g.Wait()
+
+	// We can safely allow RenameData errors up to len(er.getDisks()) - writeQuorum
+	// otherwise return failure. Cleanup successful renames.
+	err := reduceWriteQuorumErrs(ctx, errs, objectOpIgnoredErrs, quorum)
+	return evalDisks(disks, errs), err
+}
+
 // writeUniqueFileInfo - writes unique `xl.meta` content for each disk concurrently.
 func writeUniqueFileInfo(ctx context.Context, disks []StorageAPI, bucket, prefix string, files []FileInfo, quorum int) ([]StorageAPI, error) {
 	g := errgroup.WithNErrs(len(disks))

cmd/erasure-object.go

@@ -124,11 +124,27 @@ func (er erasureObjects) CopyObject(ctx context.Context, srcBucket, srcObject, d
 		}
 	}
 
-	// Write directly...
-	if _, err = writeUniqueFileInfo(ctx, onlineDisks, srcBucket, srcObject, metaArr, writeQuorum); err != nil {
-		logger.LogIf(ctx, err)
-		return ObjectInfo{}, toObjectErr(err, srcBucket, srcObject)
+	tempObj := mustGetUUID()
+
+	var online int
+	// Cleanup in case of xl.meta writing failure
+	defer func() {
+		if online != len(onlineDisks) {
+			er.deleteObject(context.Background(), minioMetaTmpBucket, tempObj, writeQuorum)
 		}
+	}()
+
+	// Write unique `xl.meta` for each disk.
+	if onlineDisks, err = writeUniqueFileInfo(ctx, onlineDisks, minioMetaTmpBucket, tempObj, metaArr, writeQuorum); err != nil {
+		return oi, toObjectErr(err, srcBucket, srcObject)
+	}
+
+	// Rename atomically `xl.meta` from tmp location to destination for each disk.
+	if _, err = renameFileInfo(ctx, onlineDisks, minioMetaTmpBucket, tempObj, srcBucket, srcObject, writeQuorum); err != nil {
+		return oi, toObjectErr(err, srcBucket, srcObject)
+	}
+
+	online = countOnlineDisks(onlineDisks)
 
 	return fi.ToObjectInfo(srcBucket, srcObject), nil
 }
@@ -806,7 +822,6 @@ func (er erasureObjects) putObject(ctx context.Context, bucket string, object st
 	}
 
 	// Write unique `xl.meta` for each disk.
-	if len(inlineBuffers) == 0 {
 	if onlineDisks, err = writeUniqueFileInfo(ctx, onlineDisks, minioMetaTmpBucket, tempObj, partsMetadata, writeQuorum); err != nil {
 		logger.LogIf(ctx, err)
 		return ObjectInfo{}, toObjectErr(err, bucket, object)
@@ -817,13 +832,6 @@ func (er erasureObjects) putObject(ctx context.Context, bucket string, object st
 		logger.LogIf(ctx, err)
 		return ObjectInfo{}, toObjectErr(err, bucket, object)
 	}
-	} else {
-		// Write directly...
-		if onlineDisks, err = writeUniqueFileInfo(ctx, onlineDisks, bucket, object, partsMetadata, writeQuorum); err != nil {
-			logger.LogIf(ctx, err)
-			return ObjectInfo{}, toObjectErr(err, bucket, object)
-		}
-	}
 
 	// Whether a disk was initially or becomes offline
 	// during this upload, send it to the MRF list.
@@ -1245,12 +1253,28 @@ func (er erasureObjects) PutObjectTags(ctx context.Context, bucket, object strin
 		}
 	}
 
-	// Write directly...
-	if _, err = writeUniqueFileInfo(ctx, onlineDisks, bucket, object, metaArr, writeQuorum); err != nil {
-		logger.LogIf(ctx, err)
+	tempObj := mustGetUUID()
+
+	var online int
+	// Cleanup in case of xl.meta writing failure
+	defer func() {
+		if online != len(onlineDisks) {
+			er.deleteObject(context.Background(), minioMetaTmpBucket, tempObj, writeQuorum)
+		}
+	}()
+
+	// Write unique `xl.meta` for each disk.
+	if onlineDisks, err = writeUniqueFileInfo(ctx, onlineDisks, minioMetaTmpBucket, tempObj, metaArr, writeQuorum); err != nil {
 		return ObjectInfo{}, toObjectErr(err, bucket, object)
 	}
 
+	// Atomically rename metadata from tmp location to destination for each disk.
+	if onlineDisks, err = renameFileInfo(ctx, onlineDisks, minioMetaTmpBucket, tempObj, bucket, object, writeQuorum); err != nil {
+		return ObjectInfo{}, toObjectErr(err, bucket, object)
+	}
+
+	online = countOnlineDisks(onlineDisks)
+
 	objInfo := fi.ToObjectInfo(bucket, object)
 	objInfo.UserTags = tags
 
@@ -1302,12 +1326,28 @@ func (er erasureObjects) updateObjectMeta(ctx context.Context, bucket, object st
 		metaArr[i].Metadata = fi.Metadata
 	}
 
-	// Write directly...
-	if _, err = writeUniqueFileInfo(ctx, disks, bucket, object, metaArr, writeQuorum); err != nil {
+	tempObj := mustGetUUID()
+
+	var online int
+	// Cleanup in case of xl.meta writing failure
+	defer func() {
+		if online != len(disks) {
+			er.deleteObject(context.Background(), minioMetaTmpBucket, tempObj, writeQuorum)
+		}
+	}()
+
+	// Write unique `xl.meta` for each disk.
+	if disks, err = writeUniqueFileInfo(ctx, disks, minioMetaTmpBucket, tempObj, metaArr, writeQuorum); err != nil {
+		return toObjectErr(err, bucket, object)
+	}
+
+	// Atomically rename metadata from tmp location to destination for each disk.
+	if disks, err = renameFileInfo(ctx, disks, minioMetaTmpBucket, tempObj, bucket, object, writeQuorum); err != nil {
 		logger.LogIf(ctx, err)
 		return toObjectErr(err, bucket, object)
 	}
 
+	online = countOnlineDisks(disks)
 	return nil
 }
 

cmd/xl-storage-disk-id-check.go

@@ -64,11 +64,14 @@ const (
 
 // Detects change in underlying disk.
 type xlStorageDiskIDCheck struct {
+	// fields position optimized for memory please
+	// do not re-order them, if you add new fields
+	// please use `fieldalignment ./...` to check
+	// if your changes are not causing any problems.
 	storage      StorageAPI
-	diskID  string
-
-	apiCalls     [storageMetricLast]uint64
 	apiLatencies [storageMetricLast]ewma.MovingAverage
+	diskID       string
+	apiCalls     [storageMetricLast]uint64
 }
 
 func (p *xlStorageDiskIDCheck) getMetrics() DiskMetrics {

cmd/xl-storage.go

@@ -1613,9 +1613,6 @@ func (s *xlStorage) CheckParts(ctx context.Context, volume string, path string,
 
 	for _, part := range fi.Parts {
 		partPath := pathJoin(path, fi.DataDir, fmt.Sprintf("part.%d", part.Number))
-		if fi.XLV1 {
-			partPath = pathJoin(path, fmt.Sprintf("part.%d", part.Number))
-		}
 		filePath := pathJoin(volumeDir, partPath)
 		if err = checkPathLength(filePath); err != nil {
 			return err
@@ -1778,10 +1775,6 @@ func (s *xlStorage) Delete(ctx context.Context, volume string, path string, recu
 
 // RenameData - rename source path to destination path atomically, metadata and data directory.
 func (s *xlStorage) RenameData(ctx context.Context, srcVolume, srcPath, dataDir, dstVolume, dstPath string) (err error) {
-	if dataDir == "" {
-		return errInvalidArgument
-	}
-
 	srcVolumeDir, err := s.getVolDir(srcVolume)
 	if err != nil {
 		return err
@@ -1814,11 +1807,15 @@ func (s *xlStorage) RenameData(ctx context.Context, srcVolume, srcPath, dataDir,
 	srcFilePath := pathutil.Join(srcVolumeDir, pathJoin(srcPath, xlStorageFormatFile))
 	dstFilePath := pathutil.Join(dstVolumeDir, pathJoin(dstPath, xlStorageFormatFile))
 
-	srcDataPath := retainSlash(pathJoin(srcVolumeDir, srcPath, dataDir))
+	var srcDataPath string
+	var dstDataPath string
+	if dataDir != "" {
+		srcDataPath = retainSlash(pathJoin(srcVolumeDir, srcPath, dataDir))
 		// make sure to always use path.Join here, do not use pathJoin as
 		// it would additionally add `/` at the end and it comes in the
 		// way of renameAll(), parentDir creation.
-	dstDataPath := pathutil.Join(dstVolumeDir, dstPath, dataDir)
+		dstDataPath = pathutil.Join(dstVolumeDir, dstPath, dataDir)
+	}
 
 	if err = checkPathLength(srcFilePath); err != nil {
 		return err
@@ -1994,23 +1991,34 @@ func (s *xlStorage) RenameData(ctx context.Context, srcVolume, srcPath, dataDir,
 		return errFileCorrupt
 	}
 
+	if srcDataPath != "" {
 		if err = s.WriteAll(ctx, srcVolume, pathJoin(srcPath, xlStorageFormatFile), dstBuf); err != nil {
 			return err
 		}
 
-	tmpuuid := mustGetUUID()
-	renameAll(oldDstDataPath, pathutil.Join(s.diskPath, minioMetaTmpDeletedBucket, tmpuuid))
-	tmpuuid = mustGetUUID()
-	renameAll(dstDataPath, pathutil.Join(s.diskPath, minioMetaTmpDeletedBucket, tmpuuid))
+		if oldDstDataPath != "" {
+			renameAll(oldDstDataPath, pathutil.Join(s.diskPath, minioMetaTmpDeletedBucket, mustGetUUID()))
+		}
+		renameAll(dstDataPath, pathutil.Join(s.diskPath, minioMetaTmpDeletedBucket, mustGetUUID()))
+
+		// renameAll only for objects that have xl.meta not saved inline.
+		if len(fi.Data) == 0 && fi.Size > 0 {
 			if err = renameAll(srcDataPath, dstDataPath); err != nil {
 				logger.LogIf(ctx, err)
 				return osErrToFileErr(err)
 			}
+		}
 
 		// Commit meta-file
 		if err = renameAll(srcFilePath, dstFilePath); err != nil {
 			return osErrToFileErr(err)
 		}
+	} else {
+		// Write meta-file directly, no data
+		if err = s.WriteAll(ctx, dstVolume, pathJoin(dstPath, xlStorageFormatFile), dstBuf); err != nil {
+			return err
+		}
+	}
 
 	// Remove parent dir of the source file if empty
 	parentDir := pathutil.Dir(srcFilePath)
@@ -2137,9 +2145,6 @@ func (s *xlStorage) VerifyFile(ctx context.Context, volume, path string, fi File
 	for _, part := range fi.Parts {
 		checksumInfo := erasure.GetChecksumInfo(part.Number)
 		partPath := pathJoin(volumeDir, path, fi.DataDir, fmt.Sprintf("part.%d", part.Number))
-		if fi.XLV1 {
-			partPath = pathJoin(volumeDir, path, fmt.Sprintf("part.%d", part.Number))
-		}
 		if err := s.bitrotVerify(partPath,
 			erasure.ShardFileSize(part.Size),
 			checksumInfo.Algorithm,