Optimize listing with leaf check offloaded to posix (#7541)

Other listing optimizations include

- remove double sorting while filtering object entries
- improve error message when upload-id is not in quorum
- use jsoniter for full unmarshal json, instead of gjson
- remove unused code

cmd/disk-cache.go

@@ -458,10 +458,6 @@ func (c cacheObjects) listCacheObjects(ctx context.Context, bucket, prefix, mark
 			eof = true
 			break
 		}
-		// For any walk error return right away.
-		if walkResult.err != nil {
-			return result, toObjectErr(walkResult.err, bucket, prefix)
-		}
 
 		entry := walkResult.entry
 		var objInfo ObjectInfo

cmd/fs-v1.go

@@ -1010,8 +1010,8 @@ func (fs *FSObjects) listDirFactory(isLeaf IsLeafFunc) ListDirFunc {
 			logger.LogIf(context.Background(), err)
 			return
 		}
-		entries, delayIsLeaf = filterListEntries(bucket, prefixDir, entries, prefixEntry, isLeaf)
+		sort.Strings(entries)
-		return entries, delayIsLeaf
+		return filterListEntries(bucket, prefixDir, entries, prefixEntry, isLeaf)
 	}
 
 	// Return list factory instance.

cmd/naughty-disk_test.go

@@ -111,11 +111,11 @@ func (d *naughtyDisk) DeleteVol(volume string) (err error) {
 	return d.disk.DeleteVol(volume)
 }
 
-func (d *naughtyDisk) ListDir(volume, path string, count int) (entries []string, err error) {
+func (d *naughtyDisk) ListDir(volume, path string, count int, leafFile string) (entries []string, err error) {
 	if err := d.calcError(); err != nil {
 		return []string{}, err
 	}
-	return d.disk.ListDir(volume, path, count)
+	return d.disk.ListDir(volume, path, count, leafFile)
 }
 
 func (d *naughtyDisk) ReadFile(volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error) {

cmd/object-api-common.go

@@ -116,7 +116,7 @@ func cleanupDir(ctx context.Context, storage StorageAPI, volume, dirPath string)
 		}
 
 		// If it's a directory, list and call delFunc() for each entry.
-		entries, err := storage.ListDir(volume, entryPath, -1)
+		entries, err := storage.ListDir(volume, entryPath, -1, "")
 		// If entryPath prefix never existed, safe to ignore.
 		if err == errFileNotFound {
 			return nil
@@ -218,14 +218,6 @@ func listObjects(ctx context.Context, obj ObjectLayer, bucket, prefix, marker, d
 			eof = true
 			break
 		}
-		// For any walk error return right away.
-		if walkResult.err != nil {
-			// File not found is a valid case.
-			if walkResult.err == errFileNotFound {
-				continue
-			}
-			return loi, toObjectErr(walkResult.err, bucket, prefix)
-		}
 
 		var objInfo ObjectInfo
 		var err error
@@ -235,6 +227,14 @@ func listObjects(ctx context.Context, obj ObjectLayer, bucket, prefix, marker, d
 				if err == nil {
 					break
 				}
+				if err == errFileNotFound {
+					err = nil
+					objInfo = ObjectInfo{
+						Bucket: bucket,
+						Name:   walkResult.entry,
+						IsDir:  true,
+					}
+				}
 			}
 		} else {
 			objInfo, err = getObjInfo(ctx, bucket, walkResult.entry)

cmd/object-api-errors.go

@@ -27,6 +27,22 @@ import (
 // underlying storage layer.
 func toObjectErr(err error, params ...string) error {
 	switch err {
+	case errDiskNotFound:
+		switch len(params) {
+		case 1:
+			err = BucketNotFound{Bucket: params[0]}
+		case 2:
+			err = ObjectNotFound{
+				Bucket: params[0],
+				Object: params[1],
+			}
+		case 3:
+			err = InvalidUploadID{
+				Bucket:   params[0],
+				Object:   params[1],
+				UploadID: params[2],
+			}
+		}
 	case errVolumeNotFound:
 		if len(params) >= 1 {
 			err = BucketNotFound{Bucket: params[0]}
@@ -63,11 +79,18 @@ func toObjectErr(err error, params ...string) error {
 			}
 		}
 	case errFileNotFound:
-		if len(params) >= 2 {
+		switch len(params) {
+		case 2:
 			err = ObjectNotFound{
 				Bucket: params[0],
 				Object: params[1],
 			}
+		case 3:
+			err = InvalidUploadID{
+				Bucket:   params[0],
+				Object:   params[1],
+				UploadID: params[2],
+			}
 		}
 	case errFileNameTooLong:
 		if len(params) >= 2 {
@@ -321,6 +344,8 @@ func (e MalformedUploadID) Error() string {
 
 // InvalidUploadID invalid upload id.
 type InvalidUploadID struct {
+	Bucket   string
+	Object   string
 	UploadID string
 }
 

cmd/object-api-multipart_test.go

@@ -228,8 +228,7 @@ func testPutObjectPartDiskNotFound(obj ObjectLayer, instanceType string, disks [
 	}
 
 	// This causes quorum failure verify.
-	disks = disks[len(disks)-3:]
+	for _, disk := range disks[len(disks)-3:] {
-	for _, disk := range disks {
 		os.RemoveAll(disk)
 	}
 
@@ -240,9 +239,26 @@ func testPutObjectPartDiskNotFound(obj ObjectLayer, instanceType string, disks [
 		t.Fatalf("Test %s: expected to fail but passed instead", instanceType)
 	}
 	// as majority of xl.json are not available, we expect uploadID to be not available.
-	expectedErr := InvalidUploadID{UploadID: testCase.uploadID}
+	expectedErr1 := InsufficientReadQuorum{}
-	if err.Error() != expectedErr.Error() {
+	if err.Error() != expectedErr1.Error() {
-		t.Fatalf("Test %s: expected error %s, got %s instead.", instanceType, expectedErr, err)
+		t.Fatalf("Test %s: expected error %s, got %s instead.", instanceType, expectedErr1, err)
+	}
+
+	// This causes invalid upload id.
+	for _, disk := range disks {
+		os.RemoveAll(disk)
+	}
+
+	// Object part upload should fail with bucket not found.
+	_, err = obj.PutObjectPart(context.Background(), testCase.bucketName, testCase.objName, testCase.uploadID, testCase.PartID, mustGetPutObjReader(t, bytes.NewBufferString(testCase.inputReaderData), testCase.intputDataSize, testCase.inputMd5, sha256sum), ObjectOptions{})
+	if err == nil {
+		t.Fatalf("Test %s: expected to fail but passed instead", instanceType)
+	}
+
+	// As all disks at not available, bucket not found.
+	expectedErr2 := BucketNotFound{Bucket: testCase.bucketName}
+	if err.Error() != expectedErr2.Error() {
+		t.Fatalf("Test %s: expected error %s, got %s instead.", instanceType, expectedErr2, err)
 	}
 }
 

cmd/posix-list-dir_unix.go

@@ -20,7 +20,6 @@ package cmd
 
 import (
 	"os"
-	"path"
 	"runtime"
 	"sync"
 	"syscall"
@@ -79,7 +78,7 @@ func parseDirents(dirPath string, buf []byte) (entries []string, err error) {
 			// On Linux XFS does not implement d_type for on disk
 			// format << v5. Fall back to OsStat().
 			var fi os.FileInfo
-			fi, err = os.Stat(path.Join(dirPath, name))
+			fi, err = os.Stat(pathJoin(dirPath, name))
 			if err != nil {
 				// If file does not exist, we continue and skip it.
 				// Could happen if it was deleted in the middle while

cmd/posix-list-dir_windows.go

@@ -20,7 +20,6 @@ package cmd
 
 import (
 	"os"
-	"path"
 	"strings"
 	"syscall"
 )
@@ -82,7 +81,7 @@ func readDirN(dirPath string, count int) (entries []string, err error) {
 		case data.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT != 0:
 			// If its symbolic link, follow the link using os.Stat()
 			var fi os.FileInfo
-			fi, err = os.Stat(path.Join(dirPath, name))
+			fi, err = os.Stat(pathJoin(dirPath, name))
 			if err != nil {
 				// If file does not exist, we continue and skip it.
 				// Could happen if it was deleted in the middle while

cmd/posix.go

@@ -651,7 +651,7 @@ func (s *posix) DeleteVol(volume string) (err error) {
 
 // ListDir - return all the entries at the given directory path.
 // If an entry is a directory it will be returned with a trailing "/".
-func (s *posix) ListDir(volume, dirPath string, count int) (entries []string, err error) {
+func (s *posix) ListDir(volume, dirPath string, count int, leafFile string) (entries []string, err error) {
 	defer func() {
 		if err == errFaultyDisk {
 			atomic.AddInt32(&s.ioErrCount, 1)
@@ -684,9 +684,21 @@ func (s *posix) ListDir(volume, dirPath string, count int) (entries []string, er
 
 	dirPath = pathJoin(volumeDir, dirPath)
 	if count > 0 {
-		return readDirN(dirPath, count)
+		entries, err = readDirN(dirPath, count)
+	} else {
+		entries, err = readDir(dirPath)
 	}
-	return readDir(dirPath)
+
+	// If leaf file is specified, filter out the entries.
+	if leafFile != "" {
+		for i, entry := range entries {
+			if _, serr := os.Stat(pathJoin(dirPath, entry, leafFile)); serr == nil {
+				entries[i] = strings.TrimSuffix(entry, slashSeparator)
+			}
+		}
+	}
+
+	return entries, err
 }
 
 // ReadAll reads from r until an error or EOF and returns the data it read.

cmd/posix_test.go

@@ -839,7 +839,7 @@ func TestPosixPosixListDir(t *testing.T) {
 		} else {
 			t.Errorf("Expected the StorageAPI to be of type *posix")
 		}
-		dirList, err = posixStorage.ListDir(testCase.srcVol, testCase.srcPath, -1)
+		dirList, err = posixStorage.ListDir(testCase.srcVol, testCase.srcPath, -1, "")
 		if err != testCase.expectedErr {
 			t.Fatalf("TestPosix case %d: Expected: \"%s\", got: \"%s\"", i+1, testCase.expectedErr, err)
 		}

cmd/storage-interface.go

@@ -39,7 +39,7 @@ type StorageAPI interface {
 	DeleteVol(volume string) (err error)
 
 	// File operations.
-	ListDir(volume, dirPath string, count int) ([]string, error)
+	ListDir(volume, dirPath string, count int, leafFile string) ([]string, error)
 	ReadFile(volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error)
 	AppendFile(volume string, path string, buf []byte) (err error)
 	CreateFile(volume, path string, size int64, reader io.Reader) error

cmd/storage-rest-client.go

@@ -315,11 +315,12 @@ func (client *storageRESTClient) ReadFile(volume, path string, offset int64, buf
 }
 
 // ListDir - lists a directory.
-func (client *storageRESTClient) ListDir(volume, dirPath string, count int) (entries []string, err error) {
+func (client *storageRESTClient) ListDir(volume, dirPath string, count int, leafFile string) (entries []string, err error) {
 	values := make(url.Values)
 	values.Set(storageRESTVolume, volume)
 	values.Set(storageRESTDirPath, dirPath)
 	values.Set(storageRESTCount, strconv.Itoa(count))
+	values.Set(storageRESTLeafFile, leafFile)
 	respBody, err := client.call(storageRESTMethodListDir, values, nil, -1)
 	if err != nil {
 		return nil, err

cmd/storage-rest-common.go

@@ -16,7 +16,7 @@
 
 package cmd
 
-const storageRESTVersion = "v4"
+const storageRESTVersion = "v5"
 const storageRESTPath = minioReservedBucketPath + "/storage/" + storageRESTVersion + "/"
 
 const (
@@ -50,6 +50,7 @@ const (
 	storageRESTOffset     = "offset"
 	storageRESTLength     = "length"
 	storageRESTCount      = "count"
+	storageRESTLeafFile   = "leaf-file"
 	storageRESTBitrotAlgo = "bitrot-algo"
 	storageRESTBitrotHash = "bitrot-hash"
 	storageRESTInstanceID = "instance-id"

cmd/storage-rest-server.go

@@ -361,12 +361,13 @@ func (s *storageRESTServer) ListDirHandler(w http.ResponseWriter, r *http.Reques
 	vars := mux.Vars(r)
 	volume := vars[storageRESTVolume]
 	dirPath := vars[storageRESTDirPath]
+	leafFile := vars[storageRESTLeafFile]
 	count, err := strconv.Atoi(vars[storageRESTCount])
 	if err != nil {
 		s.writeErrorResponse(w, err)
 		return
 	}
-	entries, err := s.storage.ListDir(volume, dirPath, count)
+	entries, err := s.storage.ListDir(volume, dirPath, count, leafFile)
 	if err != nil {
 		s.writeErrorResponse(w, err)
 		return
@@ -443,7 +444,7 @@ func registerStorageRESTHandlers(router *mux.Router, endpoints EndpointList) {
 		subrouter.Methods(http.MethodPost).Path("/" + storageRESTMethodReadFileStream).HandlerFunc(httpTraceHdrs(server.ReadFileStreamHandler)).
 			Queries(restQueries(storageRESTVolume, storageRESTFilePath, storageRESTOffset, storageRESTLength)...)
 		subrouter.Methods(http.MethodPost).Path("/" + storageRESTMethodListDir).HandlerFunc(httpTraceHdrs(server.ListDirHandler)).
-			Queries(restQueries(storageRESTVolume, storageRESTDirPath, storageRESTCount)...)
+			Queries(restQueries(storageRESTVolume, storageRESTDirPath, storageRESTCount, storageRESTLeafFile)...)
 		subrouter.Methods(http.MethodPost).Path("/" + storageRESTMethodDeleteFile).HandlerFunc(httpTraceHdrs(server.DeleteFileHandler)).
 			Queries(restQueries(storageRESTVolume, storageRESTFilePath)...)
 		subrouter.Methods(http.MethodPost).Path("/" + storageRESTMethodRenameFile).HandlerFunc(httpTraceHdrs(server.RenameFileHandler)).

cmd/storage-rest_test.go

@@ -260,7 +260,7 @@ func testStorageAPIListDir(t *testing.T, storage StorageAPI) {
 	}
 
 	for i, testCase := range testCases {
-		result, err := storage.ListDir(testCase.volumeName, testCase.prefix, -1)
+		result, err := storage.ListDir(testCase.volumeName, testCase.prefix, -1, "")
 		expectErr := (err != nil)
 
 		if expectErr != testCase.expectErr {

cmd/tree-walk.go

@@ -25,7 +25,6 @@ import (
 // TreeWalkResult - Tree walk result carries results of tree walking.
 type TreeWalkResult struct {
 	entry string
-	err   error
 	end   bool
 }
 
@@ -99,10 +98,8 @@ type IsLeafFunc func(string, string) bool
 // IsLeafDirFunc - A function isLeafDir of type isLeafDirFunc is used to detect if an entry represents an empty directory.
 type IsLeafDirFunc func(string, string) bool
 
+// Note: input entries are expected to be sorted.
 func filterListEntries(bucket, prefixDir string, entries []string, prefixEntry string, isLeaf IsLeafFunc) ([]string, bool) {
-	// Listing needs to be sorted.
-	sort.Strings(entries)
-
 	// Filter entries that have the prefix prefixEntry.
 	entries = filterMatchingPrefix(entries, prefixEntry)
 
@@ -168,9 +165,10 @@ func doTreeWalk(ctx context.Context, bucket, prefixDir, entryPrefixMatch, marker
 	for i, entry := range entries {
 		var leaf, leafDir bool
 
+		pentry := pathJoin(prefixDir, entry)
 		// Decision to do isLeaf check was pushed from listDir() to here.
 		if delayIsLeaf {
-			leaf = isLeaf(bucket, pathJoin(prefixDir, entry))
+			leaf = isLeaf(bucket, pentry)
 			if leaf {
 				entry = strings.TrimSuffix(entry, slashSeparator)
 			}
@@ -179,7 +177,7 @@ func doTreeWalk(ctx context.Context, bucket, prefixDir, entryPrefixMatch, marker
 		}
 
 		if strings.HasSuffix(entry, slashSeparator) {
-			leafDir = isLeafDir(bucket, pathJoin(prefixDir, entry))
+			leafDir = isLeafDir(bucket, pentry)
 		}
 
 		isDir := !leafDir && !leaf
@@ -209,17 +207,19 @@ func doTreeWalk(ctx context.Context, bucket, prefixDir, entryPrefixMatch, marker
 			// markIsEnd is passed to this entry's treeWalk() so that treeWalker.end can be marked
 			// true at the end of the treeWalk stream.
 			markIsEnd := i == len(entries)-1 && isEnd
-			if tErr := doTreeWalk(ctx, bucket, pathJoin(prefixDir, entry), prefixMatch, markerArg, recursive, listDir, isLeaf, isLeafDir, resultCh, endWalkCh, markIsEnd); tErr != nil {
+			if err := doTreeWalk(ctx, bucket, pentry, prefixMatch, markerArg, recursive,
-				return tErr
+				listDir, isLeaf, isLeafDir, resultCh, endWalkCh, markIsEnd); err != nil {
+				return err
 			}
 			continue
 		}
+
 		// EOF is set if we are at last entry and the caller indicated we at the end.
 		isEOF := ((i == len(entries)-1) && isEnd)
 		select {
 		case <-endWalkCh:
 			return errWalkAbort
-		case resultCh <- TreeWalkResult{entry: pathJoin(prefixDir, entry), end: isEOF}:
+		case resultCh <- TreeWalkResult{entry: pentry, end: isEOF}:
 		}
 	}
 

cmd/tree-walk_test.go

@@ -189,7 +189,7 @@ func TestTreeWalk(t *testing.T) {
 	}
 
 	isLeafDir := func(volume, prefix string) bool {
-		entries, listErr := disk.ListDir(volume, prefix, 1)
+		entries, listErr := disk.ListDir(volume, prefix, 1, "")
 		if listErr != nil {
 			return false
 		}
@@ -233,7 +233,7 @@ func TestTreeWalkTimeout(t *testing.T) {
 	}
 
 	isLeafDir := func(volume, prefix string) bool {
-		entries, listErr := disk.ListDir(volume, prefix, 1)
+		entries, listErr := disk.ListDir(volume, prefix, 1, "")
 		if listErr != nil {
 			return false
 		}
@@ -379,7 +379,7 @@ func TestRecursiveTreeWalk(t *testing.T) {
 	}
 
 	isLeafDir := func(volume, prefix string) bool {
-		entries, listErr := disk1.ListDir(volume, prefix, 1)
+		entries, listErr := disk1.ListDir(volume, prefix, 1, "")
 		if listErr != nil {
 			return false
 		}
@@ -494,7 +494,7 @@ func TestSortedness(t *testing.T) {
 	}
 
 	isLeafDir := func(volume, prefix string) bool {
-		entries, listErr := disk1.ListDir(volume, prefix, 1)
+		entries, listErr := disk1.ListDir(volume, prefix, 1, "")
 		if listErr != nil {
 			return false
 		}
@@ -577,7 +577,7 @@ func TestTreeWalkIsEnd(t *testing.T) {
 	}
 
 	isLeafDir := func(volume, prefix string) bool {
-		entries, listErr := disk1.ListDir(volume, prefix, 1)
+		entries, listErr := disk1.ListDir(volume, prefix, 1, "")
 		if listErr != nil {
 			return false
 		}

cmd/xl-sets.go

@@ -654,7 +654,7 @@ func listDirSetsFactory(ctx context.Context, isLeaf IsLeafFunc, isLeafDir IsLeaf
 			wg.Add(1)
 			go func(index int, disk StorageAPI) {
 				defer wg.Done()
-				diskEntries[index], _ = disk.ListDir(bucket, prefixDir, -1)
+				diskEntries[index], _ = disk.ListDir(bucket, prefixDir, -1, xlMetaJSONFile)
 			}(index, disk)
 		}
 
@@ -713,21 +713,10 @@ func listDirSetsFactory(ctx context.Context, isLeaf IsLeafFunc, isLeafDir IsLeaf
 // value through the walk channel receives the data properly lexically sorted.
 func (s *xlSets) ListObjects(ctx context.Context, bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
 	isLeaf := func(bucket, entry string) bool {
-		entry = strings.TrimSuffix(entry, slashSeparator)
+		return !hasSuffix(entry, slashSeparator)
-		// Verify if we are at the leaf, a leaf is where we
-		// see `xl.json` inside a directory.
-		return s.getHashedSet(entry).isObject(bucket, entry)
 	}
 
 	isLeafDir := func(bucket, entry string) bool {
-		// Verify prefixes in all sets.
-		var ok bool
-		for _, set := range s.sets {
-			ok = set.isObjectDir(bucket, entry)
-			if ok {
-				return true
-			}
-		}
 		return false
 	}
 
@@ -1271,10 +1260,6 @@ func (s *xlSets) HealObjects(ctx context.Context, bucket, prefix string, healObj
 		if !ok {
 			break
 		}
-		// For any walk error return right away.
-		if walkResult.err != nil {
-			return toObjectErr(walkResult.err, bucket, prefix)
-		}
 		if err := healObjectFn(bucket, strings.TrimSuffix(walkResult.entry, slashSeparator+xlMetaJSONFile)); err != nil {
 			return toObjectErr(err, bucket, walkResult.entry)
 		}

cmd/xl-v1-common.go

@@ -98,7 +98,7 @@ func (xl xlObjects) isObjectDir(bucket, prefix string) (ok bool) {
 		go func(index int, disk StorageAPI) {
 			defer wg.Done()
 			// Check if 'prefix' is an object on this 'disk', else continue the check the next disk
-			entries, err := disk.ListDir(bucket, prefix, 1)
+			entries, err := disk.ListDir(bucket, prefix, 1, "")
 			if err != nil {
 				errs[index] = err
 				return

cmd/xl-v1-healing.go

@@ -341,7 +341,7 @@ func (xl xlObjects) healObject(ctx context.Context, bucket string, object string
 		}
 
 		// List and delete the object directory,
-		files, derr := disk.ListDir(bucket, object, -1)
+		files, derr := disk.ListDir(bucket, object, -1, "")
 		if derr == nil {
 			for _, entry := range files {
 				_ = disk.DeleteFile(bucket,
@@ -478,52 +478,51 @@ func (xl xlObjects) healObjectDir(ctx context.Context, bucket, object string, dr
 	hr.Before.Drives = make([]madmin.HealDriveInfo, len(storageDisks))
 	hr.After.Drives = make([]madmin.HealDriveInfo, len(storageDisks))
 
-	var wg sync.WaitGroup
+	errs := statAllDirs(ctx, storageDisks, bucket, object)
+	if isObjectDirDangling(errs) {
+		for i, err := range errs {
+			if err == nil {
+				storageDisks[i].DeleteFile(bucket, object)
+			}
+		}
+	}
 
 	// Prepare object creation in all disks
-	for i, d := range storageDisks {
+	for i, err := range errs {
-		wg.Add(1)
+		var drive string
-		go func(idx int, disk StorageAPI) {
+		if storageDisks[i] != nil {
-			defer wg.Done()
+			drive = storageDisks[i].String()
-			if disk == nil {
-				hr.Before.Drives[idx] = madmin.HealDriveInfo{State: madmin.DriveStateOffline}
-				hr.After.Drives[idx] = madmin.HealDriveInfo{State: madmin.DriveStateOffline}
-				return
 		}
-
+		switch err {
-			drive := disk.String()
+		case errDiskNotFound:
-			hr.Before.Drives[idx] = madmin.HealDriveInfo{UUID: "", Endpoint: drive, State: madmin.DriveStateOffline}
+			hr.Before.Drives[i] = madmin.HealDriveInfo{State: madmin.DriveStateOffline}
-			hr.After.Drives[idx] = madmin.HealDriveInfo{UUID: "", Endpoint: drive, State: madmin.DriveStateOffline}
+			hr.After.Drives[i] = madmin.HealDriveInfo{State: madmin.DriveStateOffline}
-
-			_, statErr := disk.StatVol(pathJoin(bucket, object))
-			switch statErr {
-			case nil:
-				hr.Before.Drives[idx].State = madmin.DriveStateOk
-				hr.After.Drives[idx].State = madmin.DriveStateOk
-				// Object is fine in this disk, nothing to be done anymore, exiting
-				return
 		case errVolumeNotFound:
-				hr.Before.Drives[idx].State = madmin.DriveStateMissing
+			hr.Before.Drives[i] = madmin.HealDriveInfo{Endpoint: drive, State: madmin.DriveStateMissing}
-				hr.After.Drives[idx].State = madmin.DriveStateMissing
+			hr.After.Drives[i] = madmin.HealDriveInfo{Endpoint: drive, State: madmin.DriveStateMissing}
 		default:
-				logger.LogIf(ctx, err)
+			hr.Before.Drives[i] = madmin.HealDriveInfo{Endpoint: drive, State: madmin.DriveStateCorrupt}
-				return
+			hr.After.Drives[i] = madmin.HealDriveInfo{Endpoint: drive, State: madmin.DriveStateCorrupt}
+		}
 	}
-
 	if dryRun {
-				return
+		return hr, nil
+	}
+	for i, err := range errs {
+		switch err {
+		case errVolumeNotFound:
+			merr := storageDisks[i].MakeVol(pathJoin(bucket, object))
+			switch merr {
+			case nil, errVolumeExists:
+				hr.After.Drives[i].State = madmin.DriveStateOk
+			case errDiskNotFound:
+				hr.After.Drives[i].State = madmin.DriveStateOffline
+			default:
+				logger.LogIf(ctx, merr)
+				hr.After.Drives[i].State = madmin.DriveStateCorrupt
 			}
-
-			if err := disk.MakeVol(pathJoin(bucket, object)); err == nil || err == errVolumeExists {
-				hr.After.Drives[idx].State = madmin.DriveStateOk
-			} else {
-				logger.LogIf(ctx, err)
-				hr.After.Drives[idx].State = madmin.DriveStateOffline
 		}
-		}(i, d)
 	}
-
-	wg.Wait()
 	return hr, nil
 }
 
@@ -587,6 +586,46 @@ func defaultHealResult(latestXLMeta xlMetaV1, storageDisks []StorageAPI, errs []
 	return result
 }
 
+// Stat all directories.
+func statAllDirs(ctx context.Context, storageDisks []StorageAPI, bucket, prefix string) []error {
+	var errs = make([]error, len(storageDisks))
+	var wg sync.WaitGroup
+	for index, disk := range storageDisks {
+		if disk == nil {
+			continue
+		}
+		wg.Add(1)
+		go func(index int, disk StorageAPI) {
+			defer wg.Done()
+			entries, err := disk.ListDir(bucket, prefix, 1, "")
+			if err != nil {
+				errs[index] = err
+				return
+			}
+			if len(entries) > 0 {
+				errs[index] = errVolumeNotEmpty
+				return
+			}
+		}(index, disk)
+	}
+
+	wg.Wait()
+	return errs
+}
+
+// ObjectDir is considered dangling/corrupted if any only
+// if total disks - a combination of corrupted and missing
+// files is lesser than N/2+1 number of disks.
+func isObjectDirDangling(errs []error) (ok bool) {
+	var notFoundDir int
+	for _, readErr := range errs {
+		if readErr == errFileNotFound {
+			notFoundDir++
+		}
+	}
+	return notFoundDir > len(errs)/2
+}
+
 // Object is considered dangling/corrupted if any only
 // if total disks - a combination of corrupted and missing
 // files is lesser than number of data blocks.

cmd/xl-v1-list-objects.go

@@ -34,7 +34,7 @@ func listDirFactory(ctx context.Context, isLeaf IsLeafFunc, disks ...StorageAPI)
 			var entries []string
 			var newEntries []string
 			var err error
-			entries, err = disk.ListDir(bucket, prefixDir, -1)
+			entries, err = disk.ListDir(bucket, prefixDir, -1, xlMetaJSONFile)
 			if err != nil {
 				continue
 			}
@@ -89,10 +89,6 @@ func (xl xlObjects) listObjects(ctx context.Context, bucket, prefix, marker, del
 			eof = true
 			break
 		}
-		// For any walk error return right away.
-		if walkResult.err != nil {
-			return loi, toObjectErr(walkResult.err, bucket, prefix)
-		}
 		entry := walkResult.entry
 		var objInfo ObjectInfo
 		if hasSuffix(entry, slashSeparator) {
@@ -108,8 +104,10 @@ func (xl xlObjects) listObjects(ctx context.Context, bucket, prefix, marker, del
 				// Ignore errFileNotFound as the object might have got
 				// deleted in the interim period of listing and getObjectInfo(),
 				// ignore quorum error as it might be an entry from an outdated disk.
-				switch err {
+				if IsErrIgnored(err, []error{
-				case errFileNotFound, errXLReadQuorum:
+					errFileNotFound,
+					errXLReadQuorum,
+				}...) {
 					continue
 				}
 				return loi, toObjectErr(err, bucket, prefix)

cmd/xl-v1-metadata.go

@@ -1,5 +1,5 @@
 /*
- * MinIO Cloud Storage, (C) 2016, 2017, 2017 MinIO, Inc.
+ * MinIO Cloud Storage, (C) 2016-2019 MinIO, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,6 +27,7 @@ import (
 	"sync"
 	"time"
 
+	jsoniter "github.com/json-iterator/go"
 	"github.com/minio/minio/cmd/logger"
 )
 
@@ -74,8 +75,8 @@ func (c ChecksumInfo) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON - should never be called, instead xlMetaV1UnmarshalJSON() should be used.
 func (c *ChecksumInfo) UnmarshalJSON(data []byte) error {
-	logger.LogIf(context.Background(), errUnexpected)
 	var info checksumInfoJSON
+	var json = jsoniter.ConfigCompatibleWithStandardLibrary
 	if err := json.Unmarshal(data, &info); err != nil {
 		return err
 	}

cmd/xl-v1-multipart.go

@@ -47,9 +47,10 @@ func (xl xlObjects) getMultipartSHADir(bucket, object string) string {
 	return getSHA256Hash([]byte(pathJoin(bucket, object)))
 }
 
-// isUploadIDExists - verify if a given uploadID exists and is valid.
+// checkUploadIDExists - verify if a given uploadID exists and is valid.
-func (xl xlObjects) isUploadIDExists(ctx context.Context, bucket, object, uploadID string) bool {
+func (xl xlObjects) checkUploadIDExists(ctx context.Context, bucket, object, uploadID string) error {
-	return xl.isObject(minioMetaMultipartBucket, xl.getUploadIDDir(bucket, object, uploadID))
+	_, err := xl.getObjectInfo(ctx, minioMetaMultipartBucket, xl.getUploadIDDir(bucket, object, uploadID))
+	return err
 }
 
 // Removes part given by partName belonging to a mulitpart upload from minioMetaBucket
@@ -163,7 +164,7 @@ func (xl xlObjects) ListMultipartUploads(ctx context.Context, bucket, object, ke
 		if disk == nil {
 			continue
 		}
-		uploadIDs, err := disk.ListDir(minioMetaMultipartBucket, xl.getMultipartSHADir(bucket, object), -1)
+		uploadIDs, err := disk.ListDir(minioMetaMultipartBucket, xl.getMultipartSHADir(bucket, object), -1, "")
 		if err != nil {
 			if err == errFileNotFound {
 				return result, nil
@@ -308,9 +309,9 @@ func (xl xlObjects) PutObjectPart(ctx context.Context, bucket, object, uploadID
 	}
 
 	// Validates if upload ID exists.
-	if !xl.isUploadIDExists(ctx, bucket, object, uploadID) {
+	if err := xl.checkUploadIDExists(ctx, bucket, object, uploadID); err != nil {
 		preUploadIDLock.RUnlock()
-		return pi, InvalidUploadID{UploadID: uploadID}
+		return pi, toObjectErr(err, bucket, object, uploadID)
 	}
 
 	// Read metadata associated with the object from all disks.
@@ -406,9 +407,9 @@ func (xl xlObjects) PutObjectPart(ctx context.Context, bucket, object, uploadID
 	}
 	defer postUploadIDLock.Unlock()
 
-	// Validate again if upload ID still exists.
+	// Validates if upload ID exists.
-	if !xl.isUploadIDExists(ctx, bucket, object, uploadID) {
+	if err := xl.checkUploadIDExists(ctx, bucket, object, uploadID); err != nil {
-		return pi, InvalidUploadID{UploadID: uploadID}
+		return pi, toObjectErr(err, bucket, object, uploadID)
 	}
 
 	// Rename temporary part file to its final location.
@@ -499,8 +500,8 @@ func (xl xlObjects) ListObjectParts(ctx context.Context, bucket, object, uploadI
 	}
 	defer uploadIDLock.Unlock()
 
-	if !xl.isUploadIDExists(ctx, bucket, object, uploadID) {
+	if err := xl.checkUploadIDExists(ctx, bucket, object, uploadID); err != nil {
-		return result, InvalidUploadID{UploadID: uploadID}
+		return result, toObjectErr(err, bucket, object, uploadID)
 	}
 
 	uploadIDPath := xl.getUploadIDDir(bucket, object, uploadID)
@@ -617,8 +618,8 @@ func (xl xlObjects) CompleteMultipartUpload(ctx context.Context, bucket string,
 	}
 	defer uploadIDLock.Unlock()
 
-	if !xl.isUploadIDExists(ctx, bucket, object, uploadID) {
+	if err := xl.checkUploadIDExists(ctx, bucket, object, uploadID); err != nil {
-		return oi, InvalidUploadID{UploadID: uploadID}
+		return oi, toObjectErr(err, bucket, object, uploadID)
 	}
 
 	// Check if an object is present as one of the parent dir.
@@ -821,8 +822,9 @@ func (xl xlObjects) AbortMultipartUpload(ctx context.Context, bucket, object, up
 	}
 	defer uploadIDLock.Unlock()
 
-	if !xl.isUploadIDExists(ctx, bucket, object, uploadID) {
+	// Validates if upload ID exists.
-		return InvalidUploadID{UploadID: uploadID}
+	if err := xl.checkUploadIDExists(ctx, bucket, object, uploadID); err != nil {
+		return toObjectErr(err, bucket, object, uploadID)
 	}
 
 	// Read metadata associated with the object from all disks.
@@ -871,12 +873,12 @@ func (xl xlObjects) cleanupStaleMultipartUploads(ctx context.Context, cleanupInt
 // Remove the old multipart uploads on the given disk.
 func (xl xlObjects) cleanupStaleMultipartUploadsOnDisk(ctx context.Context, disk StorageAPI, expiry time.Duration) {
 	now := time.Now()
-	shaDirs, err := disk.ListDir(minioMetaMultipartBucket, "", -1)
+	shaDirs, err := disk.ListDir(minioMetaMultipartBucket, "", -1, "")
 	if err != nil {
 		return
 	}
 	for _, shaDir := range shaDirs {
-		uploadIDDirs, err := disk.ListDir(minioMetaMultipartBucket, shaDir, -1)
+		uploadIDDirs, err := disk.ListDir(minioMetaMultipartBucket, shaDir, -1, "")
 		if err != nil {
 			continue
 		}

cmd/xl-v1-object.go

@@ -173,10 +173,6 @@ func (xl xlObjects) GetObjectNInfo(ctx context.Context, bucket, object string, r
 	// Handler directory request by returning a reader that
 	// returns no bytes.
 	if hasSuffix(object, slashSeparator) {
-		if !xl.isObjectDir(bucket, object) {
-			nsUnlocker()
-			return nil, toObjectErr(errFileNotFound, bucket, object)
-		}
 		var objInfo ObjectInfo
 		if objInfo, err = xl.getObjectInfoDir(ctx, bucket, object); err != nil {
 			nsUnlocker()
@@ -375,19 +371,16 @@ func (xl xlObjects) getObjectInfoDir(ctx context.Context, bucket, object string)
 		wg.Add(1)
 		go func(index int, disk StorageAPI) {
 			defer wg.Done()
-			if _, err := disk.StatVol(pathJoin(bucket, object)); err != nil {
+			// Check if 'prefix' is an object on this 'disk'.
-				// Since we are re-purposing StatVol, an object which
+			entries, err := disk.ListDir(bucket, object, 1, "")
-				// is a directory if it doesn't exist should be
+			if err != nil {
-				// returned as errFileNotFound instead, convert
-				// the error right here accordingly.
-				if err == errVolumeNotFound {
-					err = errFileNotFound
-				} else if err == errVolumeAccessDenied {
-					err = errFileAccessDenied
-				}
-
-				// Save error to reduce it later
 				errs[index] = err
+				return
+			}
+			if len(entries) > 0 {
+				// Not a directory if not empty.
+				errs[index] = errFileNotFound
+				return
 			}
 		}(index, disk)
 	}
@@ -412,13 +405,11 @@ func (xl xlObjects) GetObjectInfo(ctx context.Context, bucket, object string, op
 	}
 
 	if hasSuffix(object, slashSeparator) {
-		if !xl.isObjectDir(bucket, object) {
+		info, err := xl.getObjectInfoDir(ctx, bucket, object)
-			return oi, toObjectErr(errFileNotFound, bucket, object)
+		if err != nil {
+			return oi, toObjectErr(err, bucket, object)
 		}
-		if oi, e = xl.getObjectInfoDir(ctx, bucket, object); e != nil {
+		return info, nil
-			return oi, toObjectErr(e, bucket, object)
-		}
-		return oi, nil
 	}
 
 	info, err := xl.getObjectInfo(ctx, bucket, object)
@@ -879,8 +870,17 @@ func (xl xlObjects) DeleteObject(ctx context.Context, bucket, object string) (er
 	var writeQuorum int
 	var isObjectDir = hasSuffix(object, slashSeparator)
 
-	if isObjectDir && !xl.isObjectDir(bucket, object) {
+	if isObjectDir {
-		return toObjectErr(errFileNotFound, bucket, object)
+		_, err = xl.getObjectInfoDir(ctx, bucket, object)
+		if err == errXLReadQuorum {
+			if isObjectDirDangling(statAllDirs(ctx, xl.getDisks(), bucket, object)) {
+				// If object is indeed dangling, purge it.
+				err = nil
+			}
+		}
+		if err != nil {
+			return toObjectErr(err, bucket, object)
+		}
 	}
 
 	if isObjectDir {

cmd/xl-v1-utils.go

@@ -18,13 +18,13 @@ package cmd
 
 import (
 	"context"
-	"encoding/hex"
 	"errors"
 	"hash/crc32"
 	"path"
 	"sync"
 	"time"
 
+	jsoniter "github.com/json-iterator/go"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/tidwall/gjson"
 )
@@ -139,59 +139,6 @@ func parseXLFormat(xlMetaBuf []byte) string {
 	return gjson.GetBytes(xlMetaBuf, "format").String()
 }
 
-func parseXLRelease(xlMetaBuf []byte) string {
-	return gjson.GetBytes(xlMetaBuf, "minio.release").String()
-}
-
-func parseXLErasureInfo(ctx context.Context, xlMetaBuf []byte) (ErasureInfo, error) {
-	erasure := ErasureInfo{}
-	erasureResult := gjson.GetBytes(xlMetaBuf, "erasure")
-	// parse the xlV1Meta.Erasure.Distribution.
-	disResult := erasureResult.Get("distribution").Array()
-
-	distribution := make([]int, len(disResult))
-	for i, dis := range disResult {
-		distribution[i] = int(dis.Int())
-	}
-	erasure.Distribution = distribution
-
-	erasure.Algorithm = erasureResult.Get("algorithm").String()
-	erasure.DataBlocks = int(erasureResult.Get("data").Int())
-	erasure.ParityBlocks = int(erasureResult.Get("parity").Int())
-	erasure.BlockSize = erasureResult.Get("blockSize").Int()
-	erasure.Index = int(erasureResult.Get("index").Int())
-
-	checkSumsResult := erasureResult.Get("checksum").Array()
-
-	// Check for scenario where checksum information missing for some parts.
-	partsResult := gjson.GetBytes(xlMetaBuf, "parts").Array()
-	if len(checkSumsResult) != len(partsResult) {
-		return erasure, errCorruptedFormat
-	}
-
-	// Parse xlMetaV1.Erasure.Checksum array.
-	checkSums := make([]ChecksumInfo, len(checkSumsResult))
-	for i, v := range checkSumsResult {
-		algorithm := BitrotAlgorithmFromString(v.Get("algorithm").String())
-		if !algorithm.Available() {
-			logger.LogIf(ctx, errBitrotHashAlgoInvalid)
-			return erasure, errBitrotHashAlgoInvalid
-		}
-		hash, err := hex.DecodeString(v.Get("hash").String())
-		if err != nil {
-			logger.LogIf(ctx, err)
-			return erasure, err
-		}
-		name := v.Get("name").String()
-		if name == "" {
-			return erasure, errCorruptedFormat
-		}
-		checkSums[i] = ChecksumInfo{Name: name, Algorithm: algorithm, Hash: hash}
-	}
-	erasure.Checksums = checkSums
-	return erasure, nil
-}
-
 func parseXLParts(xlMetaBuf []byte) []ObjectPartInfo {
 	// Parse the XL Parts.
 	partsResult := gjson.GetBytes(xlMetaBuf, "parts").Array()
@@ -220,32 +167,9 @@ func parseXLMetaMap(xlMetaBuf []byte) map[string]string {
 
 // Constructs XLMetaV1 using `gjson` lib to retrieve each field.
 func xlMetaV1UnmarshalJSON(ctx context.Context, xlMetaBuf []byte) (xlMeta xlMetaV1, e error) {
-	// obtain version.
+	var json = jsoniter.ConfigCompatibleWithStandardLibrary
-	xlMeta.Version = parseXLVersion(xlMetaBuf)
+	e = json.Unmarshal(xlMetaBuf, &xlMeta)
-	// obtain format.
+	return xlMeta, e
-	xlMeta.Format = parseXLFormat(xlMetaBuf)
-	// Parse xlMetaV1.Stat .
-	stat, err := parseXLStat(xlMetaBuf)
-	if err != nil {
-		logger.LogIf(ctx, err)
-		return xlMeta, err
-	}
-
-	xlMeta.Stat = stat
-	// parse the xlV1Meta.Erasure fields.
-	xlMeta.Erasure, err = parseXLErasureInfo(ctx, xlMetaBuf)
-	if err != nil {
-		return xlMeta, err
-	}
-
-	// Parse the XL Parts.
-	xlMeta.Parts = parseXLParts(xlMetaBuf)
-	// Get the xlMetaV1.Realse field.
-	xlMeta.Minio.Release = parseXLRelease(xlMetaBuf)
-	// parse xlMetaV1.
-	xlMeta.Meta = parseXLMetaMap(xlMetaBuf)
-
-	return xlMeta, nil
 }
 
 // read xl.json from the given disk, parse and return xlV1MetaV1.Parts.

go.mod

@@ -43,6 +43,7 @@ require (
 	github.com/howeyc/gopass v0.0.0-20170109162249-bf9dde6d0d2c // indirect
 	github.com/inconshreveable/go-update v0.0.0-20160112193335-8152e7eb6ccf
 	github.com/jonboulle/clockwork v0.1.0 // indirect
+	github.com/json-iterator/go v1.1.6
 	github.com/klauspost/compress v1.4.1 // indirect
 	github.com/klauspost/cpuid v1.2.0 // indirect
 	github.com/klauspost/pgzip v1.2.1

go.sum

@@ -305,6 +305,7 @@ github.com/jellevandenhooff/dkim v0.0.0-20150330215556-f50fe3d243e1/go.mod h1:E0
 github.com/jmespath/go-jmespath v0.0.0-20160202185014-0b12d6b521d8/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
 github.com/jonboulle/clockwork v0.1.0 h1:VKV+ZcuP6l3yW9doeqz6ziZGgcynBVQO+obU0+0hcPo=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
+github.com/json-iterator/go v1.1.6 h1:MrUvLMLTMxbqFJ9kzlvat/rYZqZnW3u4wkLzWTaFwKs=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
 github.com/jtolds/gls v4.2.1+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
@@ -407,7 +408,9 @@ github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQz
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mitchellh/pointerstructure v0.0.0-20170205204203-f2329fcfa9e2/go.mod h1:KMNPMpc0BU/kZEgyDhBplsDn/mjnJMhyMjq4MWboN20=
 github.com/mitchellh/reflectwalk v1.0.0/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/nats-io/gnatsd v1.4.1 h1:RconcfDeWpKCD6QIIwiVFcvForlXpWeJP7i5/lDLy44=