xl-v1/Cleanup: use listOnlineDisks instead of getReadableDisks. (#1389)

Remove usage of getFileVersionQuorumMap, instead use listFileVersions
to get the version list and extract higherVersion.

Fixes #1379
Fixes #1378
Fixes #1377

xl-v1-common.go

@@ -21,70 +21,119 @@ import (
 	"errors"
 	slashpath "path"
 	"path/filepath"
+
+	"github.com/Sirupsen/logrus"
 )
 
-// Returns slice of disks needed for ReadFile operation:
+// Get the highest integer from a given integer slice.
-// - slice returing readable disks.
+func highestInt(intSlice []int64) (highestInteger int64) {
-// - fileMetadata
+	highestInteger = int64(0)
-// - bool value indicating if selfHeal is needed.
+	for _, integer := range intSlice {
-// - error if any.
+		if highestInteger < integer {
-func (xl XL) getReadableDisks(volume, path string) ([]StorageAPI, fileMetadata, bool, error) {
+			highestInteger = integer
-	partsMetadata, errs := xl.getPartsMetadata(volume, path)
-	highestVersion := int64(0)
-	versions := make([]int64, len(xl.storageDisks))
-	quorumDisks := make([]StorageAPI, len(xl.storageDisks))
-	notFoundCount := 0
-	// If quorum says errFileNotFound return errFileNotFound
-	for _, err := range errs {
-		if err == errFileNotFound {
-			notFoundCount++
 		}
 	}
-	if notFoundCount > xl.readQuorum {
+	return highestInteger
-		return nil, fileMetadata{}, false, errFileNotFound
+}
-	}
+
+// Extracts file versions from partsMetadata slice and returns version slice.
+func listFileVersions(partsMetadata []fileMetadata, errs []error) (versions []int64, err error) {
+	versions = make([]int64, len(partsMetadata))
 	for index, metadata := range partsMetadata {
 		if errs[index] == nil {
-			version, err := metadata.GetFileVersion()
+			var version int64
+			version, err = metadata.GetFileVersion()
 			if err == errMetadataKeyNotExist {
+				log.WithFields(logrus.Fields{
+					"metadata": metadata,
+				}).Errorf("Missing 'file.version', %s", errMetadataKeyNotExist)
 				versions[index] = 0
 				continue
 			}
 			if err != nil {
+				log.WithFields(logrus.Fields{
+					"metadata": metadata,
+				}).Errorf("'file.version' decoding failed with %s", err)
 				// Unexpected, return error.
-				return nil, fileMetadata{}, false, err
+				return nil, err
 			}
 			versions[index] = version
 		} else {
 			versions[index] = -1
 		}
 	}
-	quorumCount := 0
+	return versions, nil
-	for index, version := range versions {
+}
-		if version == highestVersion {
+
-			quorumDisks[index] = xl.storageDisks[index]
+// Returns slice of online disks needed.
-			quorumCount++
+// - slice returing readable disks.
-		} else {
+// - fileMetadata
-			quorumDisks[index] = nil
+// - bool value indicating if healing is needed.
-		}
+// - error if any.
-	}
+func (xl XL) listOnlineDisks(volume, path string) (onlineDisks []StorageAPI, mdata fileMetadata, heal bool, err error) {
-	if quorumCount < xl.readQuorum {
+	partsMetadata, errs := xl.getPartsMetadata(volume, path)
-		return nil, fileMetadata{}, false, errReadQuorum
+	notFoundCount := 0
-	}
-	var metadata fileMetadata
-	for index, disk := range quorumDisks {
-		if disk == nil {
-			continue
-		}
-		metadata = partsMetadata[index]
-		break
-	}
 	// FIXME: take care of the situation when a disk has failed and been removed
 	// by looking at the error returned from the fs layer. fs-layer will have
 	// to return an error indicating that the disk is not available and should be
 	// different from ErrNotExist.
-	doSelfHeal := quorumCount != len(xl.storageDisks)
+	for _, err := range errs {
-	return quorumDisks, metadata, doSelfHeal, nil
+		if err == errFileNotFound {
+			notFoundCount++
+			// If we have errors with file not found greater than allowed read
+			// quorum we return err as errFileNotFound.
+			if notFoundCount > xl.readQuorum {
+				return nil, fileMetadata{}, false, errFileNotFound
+			}
+		}
+	}
+	highestVersion := int64(0)
+	onlineDisks = make([]StorageAPI, len(xl.storageDisks))
+	// List all the file versions from partsMetadata list.
+	versions, err := listFileVersions(partsMetadata, errs)
+	if err != nil {
+		log.WithFields(logrus.Fields{
+			"volume": volume,
+			"path":   path,
+		}).Errorf("Extracting file versions failed with %s", err)
+		return nil, fileMetadata{}, false, err
+	}
+
+	// Get highest file version.
+	highestVersion = highestInt(versions)
+
+	// Pick online disks with version set to highestVersion.
+	onlineDiskCount := 0
+	for index, version := range versions {
+		if version == highestVersion {
+			mdata = partsMetadata[index]
+			onlineDisks[index] = xl.storageDisks[index]
+			onlineDiskCount++
+		} else {
+			onlineDisks[index] = nil
+		}
+	}
+
+	// If online disks count is lesser than configured disks, most
+	// probably we need to heal the file, additionally verify if the
+	// count is lesser than readQuorum, if not we throw an error.
+	if onlineDiskCount < len(xl.storageDisks) {
+		// Online disks lesser than total storage disks, needs to be
+		// healed. unless we do not have readQuorum.
+		heal = true
+		// Verify if online disks count are lesser than readQuorum
+		// threshold, return an error if yes.
+		if onlineDiskCount < xl.readQuorum {
+			log.WithFields(logrus.Fields{
+				"volume":          volume,
+				"path":            path,
+				"onlineDiskCount": onlineDiskCount,
+				"readQuorumCount": xl.readQuorum,
+			}).Errorf("%s", errReadQuorum)
+			return nil, fileMetadata{}, false, errReadQuorum
+		}
+	}
+	return onlineDisks, mdata, heal, nil
 }
 
 // Get parts.json metadata as a map slice.

xl-v1-createfile.go

@@ -18,7 +18,6 @@ package main
 
 import (
 	"encoding/hex"
-	"encoding/json"
 	"fmt"
 	"hash"
 	"io"
@@ -56,91 +55,39 @@ func closeAndRemoveWriters(writers ...io.WriteCloser) {
 	}
 }
 
-type quorumDisk struct {
-	disk  StorageAPI
-	index int
-}
-
-// getQuorumDisks - get the current quorum disks.
-func (xl XL) getQuorumDisks(volume, path string) (quorumDisks []quorumDisk, higherVersion int64) {
-	fileQuorumVersionMap := xl.getFileQuorumVersionMap(volume, path)
-	for diskIndex, formatVersion := range fileQuorumVersionMap {
-		if formatVersion > higherVersion {
-			higherVersion = formatVersion
-			quorumDisks = []quorumDisk{{
-				disk:  xl.storageDisks[diskIndex],
-				index: diskIndex,
-			}}
-
-		} else if formatVersion == higherVersion {
-			quorumDisks = append(quorumDisks, quorumDisk{
-				disk:  xl.storageDisks[diskIndex],
-				index: diskIndex,
-			})
-
-		}
-	}
-	return quorumDisks, higherVersion
-}
-
-func (xl XL) getFileQuorumVersionMap(volume, path string) map[int]int64 {
-	metadataFilePath := slashpath.Join(path, metadataFile)
-	// Set offset to 0 to read entire file.
-	offset := int64(0)
-	metadata := make(fileMetadata)
-
-	// Allocate disk index format map - do not use maps directly
-	// without allocating.
-	fileQuorumVersionMap := make(map[int]int64)
-
-	// Read meta data from all disks
-	for index, disk := range xl.storageDisks {
-		fileQuorumVersionMap[index] = -1
-
-		metadataReader, err := disk.ReadFile(volume, metadataFilePath, offset)
-		if err != nil {
-			log.WithFields(logrus.Fields{
-				"volume": volume,
-				"path":   path,
-			}).Debugf("ReadFile failed with %s", err)
-			continue
-		} else if err = json.NewDecoder(metadataReader).Decode(&metadata); err != nil {
-			log.WithFields(logrus.Fields{
-				"volume": volume,
-				"path":   path,
-			}).Debugf("JSON decoding failed with %s", err)
-			continue
-		}
-
-		version, err := metadata.GetFileVersion()
-		if err == errMetadataKeyNotExist {
-			log.WithFields(logrus.Fields{
-				"volume": volume,
-				"path":   path,
-			}).Debugf("Missing 'file.version', %s", errMetadataKeyNotExist)
-			fileQuorumVersionMap[index] = 0
-			continue
-		}
-		if err != nil {
-			log.WithFields(logrus.Fields{
-				"volume": volume,
-				"path":   path,
-			}).Debugf("'file.version' decoding failed with %s", err)
-			continue
-		}
-		fileQuorumVersionMap[index] = version
-	}
-	return fileQuorumVersionMap
-}
-
 // WriteErasure reads predefined blocks, encodes them and writes to
 // configured storage disks.
 func (xl XL) writeErasure(volume, path string, reader *io.PipeReader, wcloser *waitCloser) {
 	// Release the block writer upon function return.
 	defer wcloser.release()
 
-	// Get available quorum for existing file path.
+	// Lock right before reading from disk.
-	_, higherVersion := xl.getQuorumDisks(volume, path)
+	readLock := true
+	xl.lockNS(volume, path, readLock)
+	partsMetadata, errs := xl.getPartsMetadata(volume, path)
+	xl.unlockNS(volume, path, readLock)
+
+	// Count errors other than fileNotFound, bigger than the allowed
+	// readQuorum, if yes throw an error.
+	metadataReadErrCount := 0
+	for _, err := range errs {
+		if err != nil && err != errFileNotFound {
+			metadataReadErrCount++
+			if metadataReadErrCount > xl.readQuorum {
+				log.WithFields(logrus.Fields{
+					"volume": volume,
+					"path":   path,
+				}).Errorf("%s", err)
+				reader.CloseWithError(err)
+				return
+			}
+		}
+	}
+
+	// List all the file versions on existing files.
+	versions, err := listFileVersions(partsMetadata, errs)
+	// Get highest file version.
+	higherVersion := highestInt(versions)
 	// Increment to have next higher version.
 	higherVersion++
 
@@ -156,12 +103,13 @@ func (xl XL) writeErasure(volume, path string, reader *io.PipeReader, wcloser *w
 	createFileError := 0
 	for index, disk := range xl.storageDisks {
 		erasurePart := slashpath.Join(path, fmt.Sprintf("part.%d", index))
-		writer, err := disk.CreateFile(volume, erasurePart)
+		var writer io.WriteCloser
+		writer, err = disk.CreateFile(volume, erasurePart)
 		if err != nil {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
 				"path":   path,
-			}).Debugf("CreateFile failed with %s", err)
+			}).Errorf("CreateFile failed with %s", err)
 			createFileError++
 
 			// We can safely allow CreateFile errors up to len(xl.storageDisks) - xl.writeQuorum
@@ -183,7 +131,7 @@ func (xl XL) writeErasure(volume, path string, reader *io.PipeReader, wcloser *w
 			log.WithFields(logrus.Fields{
 				"volume": volume,
 				"path":   path,
-			}).Debugf("CreateFile failed with %s", err)
+			}).Errorf("CreateFile failed with %s", err)
 			createFileError++
 
 			// We can safely allow CreateFile errors up to
@@ -208,10 +156,15 @@ func (xl XL) writeErasure(volume, path string, reader *io.PipeReader, wcloser *w
 	var totalSize int64 // Saves total incoming stream size.
 	for {
 		// Read up to allocated block size.
-		n, err := io.ReadFull(reader, dataBuffer)
+		var n int
+		n, err = io.ReadFull(reader, dataBuffer)
 		if err != nil {
 			// Any unexpected errors, close the pipe reader with error.
 			if err != io.ErrUnexpectedEOF && err != io.EOF {
+				log.WithFields(logrus.Fields{
+					"volume": volume,
+					"path":   path,
+				}).Errorf("io.ReadFull failed with %s", err)
 				// Remove all temp writers.
 				xl.cleanupCreateFileOps(volume, path, append(writers, metadataWriters...)...)
 				reader.CloseWithError(err)
@@ -227,6 +180,10 @@ func (xl XL) writeErasure(volume, path string, reader *io.PipeReader, wcloser *w
 			var dataBlocks [][]byte
 			dataBlocks, err = xl.ReedSolomon.Split(dataBuffer[0:n])
 			if err != nil {
+				log.WithFields(logrus.Fields{
+					"volume": volume,
+					"path":   path,
+				}).Errorf("Splitting data buffer into erasure data blocks failed with %s", err)
 				// Remove all temp writers.
 				xl.cleanupCreateFileOps(volume, path, append(writers, metadataWriters...)...)
 				reader.CloseWithError(err)
@@ -236,6 +193,10 @@ func (xl XL) writeErasure(volume, path string, reader *io.PipeReader, wcloser *w
 			// Encode parity blocks using data blocks.
 			err = xl.ReedSolomon.Encode(dataBlocks)
 			if err != nil {
+				log.WithFields(logrus.Fields{
+					"volume": volume,
+					"path":   path,
+				}).Errorf("Encoding erasure data blocks failed with %s", err)
 				// Remove all temp writers upon error.
 				xl.cleanupCreateFileOps(volume, path, append(writers, metadataWriters...)...)
 				reader.CloseWithError(err)
@@ -250,6 +211,11 @@ func (xl XL) writeErasure(volume, path string, reader *io.PipeReader, wcloser *w
 				encodedData := dataBlocks[index]
 				_, err = writers[index].Write(encodedData)
 				if err != nil {
+					log.WithFields(logrus.Fields{
+						"volume":    volume,
+						"path":      path,
+						"diskIndex": index,
+					}).Errorf("Writing encoded blocks failed with %s", err)
 					// Remove all temp writers upon error.
 					xl.cleanupCreateFileOps(volume, path, append(writers, metadataWriters...)...)
 					reader.CloseWithError(err)
@@ -297,8 +263,13 @@ func (xl XL) writeErasure(volume, path string, reader *io.PipeReader, wcloser *w
 		}
 
 		// Write metadata.
-		err := metadata.Write(metadataWriter)
+		err = metadata.Write(metadataWriter)
 		if err != nil {
+			log.WithFields(logrus.Fields{
+				"volume":    volume,
+				"path":      path,
+				"diskIndex": index,
+			}).Errorf("Writing metadata failed with %s", err)
 			// Remove temporary files.
 			xl.cleanupCreateFileOps(volume, path, append(writers, metadataWriters...)...)
 			reader.CloseWithError(err)
@@ -307,8 +278,9 @@ func (xl XL) writeErasure(volume, path string, reader *io.PipeReader, wcloser *w
 	}
 
 	// Lock right before commit to disk.
-	xl.lockNS(volume, path, false)
+	readLock = false // false means writeLock.
-	defer xl.unlockNS(volume, path, false)
+	xl.lockNS(volume, path, readLock)
+	defer xl.unlockNS(volume, path, readLock)
 
 	// Close all writers and metadata writers in routines.
 	for index, writer := range writers {
@@ -316,13 +288,34 @@ func (xl XL) writeErasure(volume, path string, reader *io.PipeReader, wcloser *w
 			continue
 		}
 		// Safely wrote, now rename to its actual location.
-		writer.Close()
+		if err = writer.Close(); err != nil {
+			log.WithFields(logrus.Fields{
+				"volume":    volume,
+				"path":      path,
+				"diskIndex": index,
+			}).Errorf("Safely committing part failed with %s", err)
+			// Remove all temp writers upon error.
+			xl.cleanupCreateFileOps(volume, path, append(writers, metadataWriters...)...)
+			reader.CloseWithError(err)
+			return
+		}
 
 		if metadataWriters[index] == nil {
 			continue
 		}
 		// Safely wrote, now rename to its actual location.
-		metadataWriters[index].Close()
+		if err = metadataWriters[index].Close(); err != nil {
+			log.WithFields(logrus.Fields{
+				"volume":    volume,
+				"path":      path,
+				"diskIndex": index,
+			}).Errorf("Safely committing metadata failed with %s", err)
+			// Remove all temp writers upon error.
+			xl.cleanupCreateFileOps(volume, path, append(writers, metadataWriters...)...)
+			reader.CloseWithError(err)
+			return
+		}
+
 	}
 
 	// Close the pipe reader and return.

xl-v1-healfile.go

@@ -25,8 +25,8 @@ import (
 	"github.com/Sirupsen/logrus"
 )
 
-// doSelfHeal - heals the file at path.
+// healHeal - heals the file at path.
-func (xl XL) doHealFile(volume string, path string) error {
+func (xl XL) healFile(volume string, path string) error {
 	totalBlocks := xl.DataBlocks + xl.ParityBlocks
 	needsHeal := make([]bool, totalBlocks)
 	var readers = make([]io.Reader, totalBlocks)
@@ -37,15 +37,15 @@ func (xl XL) doHealFile(volume string, path string) error {
 	xl.lockNS(volume, path, readLock)
 	defer xl.unlockNS(volume, path, readLock)
 
-	quorumDisks, metadata, doHeal, err := xl.getReadableDisks(volume, path)
+	onlineDisks, metadata, heal, err := xl.listOnlineDisks(volume, path)
 	if err != nil {
 		log.WithFields(logrus.Fields{
 			"volume": volume,
 			"path":   path,
-		}).Debugf("Get readable disks failed with %s", err)
+		}).Errorf("List online disks failed with %s", err)
 		return err
 	}
-	if !doHeal {
+	if !heal {
 		return nil
 	}
 
@@ -54,11 +54,11 @@ func (xl XL) doHealFile(volume string, path string) error {
 		log.WithFields(logrus.Fields{
 			"volume": volume,
 			"path":   path,
-		}).Debugf("Failed to get file size, %s", err)
+		}).Errorf("Failed to get file size, %s", err)
 		return err
 	}
 
-	for index, disk := range quorumDisks {
+	for index, disk := range onlineDisks {
 		if disk == nil {
 			needsHeal[index] = true
 			continue
@@ -98,7 +98,7 @@ func (xl XL) doHealFile(volume string, path string) error {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
 				"path":   path,
-			}).Debugf("CreateFile failed with error %s", err)
+			}).Errorf("CreateFile failed with error %s", err)
 			// Unexpected error
 			closeAndRemoveWriters(writers...)
 			return err
@@ -137,7 +137,7 @@ func (xl XL) doHealFile(volume string, path string) error {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
 				"path":   path,
-			}).Debugf("%s", errDataCorrupt)
+			}).Errorf("%s", errDataCorrupt)
 			return errDataCorrupt
 		}
 
@@ -147,7 +147,7 @@ func (xl XL) doHealFile(volume string, path string) error {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
 				"path":   path,
-			}).Debugf("ReedSolomon verify failed with %s", err)
+			}).Errorf("ReedSolomon verify failed with %s", err)
 			closeAndRemoveWriters(writers...)
 			return err
 		}
@@ -165,7 +165,7 @@ func (xl XL) doHealFile(volume string, path string) error {
 				log.WithFields(logrus.Fields{
 					"volume": volume,
 					"path":   path,
-				}).Debugf("ReedSolomon reconstruct failed with %s", err)
+				}).Errorf("ReedSolomon reconstruct failed with %s", err)
 				closeAndRemoveWriters(writers...)
 				return err
 			}
@@ -175,7 +175,7 @@ func (xl XL) doHealFile(volume string, path string) error {
 				log.WithFields(logrus.Fields{
 					"volume": volume,
 					"path":   path,
-				}).Debugf("ReedSolomon verify failed with %s", err)
+				}).Errorf("ReedSolomon verify failed with %s", err)
 				closeAndRemoveWriters(writers...)
 				return err
 			}
@@ -185,7 +185,7 @@ func (xl XL) doHealFile(volume string, path string) error {
 				log.WithFields(logrus.Fields{
 					"volume": volume,
 					"path":   path,
-				}).Debugf("%s", err)
+				}).Errorf("%s", err)
 				closeAndRemoveWriters(writers...)
 				return err
 			}
@@ -199,7 +199,7 @@ func (xl XL) doHealFile(volume string, path string) error {
 				log.WithFields(logrus.Fields{
 					"volume": volume,
 					"path":   path,
-				}).Debugf("Write failed with %s", err)
+				}).Errorf("Write failed with %s", err)
 				closeAndRemoveWriters(writers...)
 				return err
 			}

xl-v1-readfile.go

@@ -38,22 +38,22 @@ func (xl XL) ReadFile(volume, path string, offset int64) (io.ReadCloser, error)
 	// Acquire a read lock.
 	readLock := true
 	xl.lockNS(volume, path, readLock)
-	quorumDisks, metadata, doSelfHeal, err := xl.getReadableDisks(volume, path)
+	onlineDisks, metadata, heal, err := xl.listOnlineDisks(volume, path)
 	xl.unlockNS(volume, path, readLock)
 	if err != nil {
 		log.WithFields(logrus.Fields{
 			"volume": volume,
 			"path":   path,
-		}).Debugf("Get readable disks failed with %s", err)
+		}).Errorf("Get readable disks failed with %s", err)
 		return nil, err
 	}
 
-	if doSelfHeal {
+	if heal {
-		if err = xl.doHealFile(volume, path); err != nil {
+		if err = xl.healFile(volume, path); err != nil {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
 				"path":   path,
-			}).Debugf("doHealFile failed with %s", err)
+			}).Errorf("healFile failed with %s", err)
 			return nil, err
 		}
 	}
@@ -67,12 +67,12 @@ func (xl XL) ReadFile(volume, path string, offset int64) (io.ReadCloser, error)
 		log.WithFields(logrus.Fields{
 			"volume": volume,
 			"path":   path,
-		}).Debugf("Failed to get file size, %s", err)
+		}).Errorf("Failed to get file size, %s", err)
 		return nil, err
 	}
 
 	readers := make([]io.ReadCloser, len(xl.storageDisks))
-	for index, disk := range quorumDisks {
+	for index, disk := range onlineDisks {
 		if disk == nil {
 			continue
 		}
@@ -121,7 +121,7 @@ func (xl XL) ReadFile(volume, path string, offset int64) (io.ReadCloser, error)
 				log.WithFields(logrus.Fields{
 					"volume": volume,
 					"path":   path,
-				}).Debugf("%s", errDataCorrupt)
+				}).Errorf("%s", errDataCorrupt)
 				pipeWriter.CloseWithError(errDataCorrupt)
 				return
 			}
@@ -133,7 +133,7 @@ func (xl XL) ReadFile(volume, path string, offset int64) (io.ReadCloser, error)
 				log.WithFields(logrus.Fields{
 					"volume": volume,
 					"path":   path,
-				}).Debugf("ReedSolomon verify failed with %s", err)
+				}).Errorf("ReedSolomon verify failed with %s", err)
 				pipeWriter.CloseWithError(err)
 				return
 			}
@@ -151,7 +151,7 @@ func (xl XL) ReadFile(volume, path string, offset int64) (io.ReadCloser, error)
 					log.WithFields(logrus.Fields{
 						"volume": volume,
 						"path":   path,
-					}).Debugf("ReedSolomon reconstruct failed with %s", err)
+					}).Errorf("ReedSolomon reconstruct failed with %s", err)
 					pipeWriter.CloseWithError(err)
 					return
 				}
@@ -161,7 +161,7 @@ func (xl XL) ReadFile(volume, path string, offset int64) (io.ReadCloser, error)
 					log.WithFields(logrus.Fields{
 						"volume": volume,
 						"path":   path,
-					}).Debugf("ReedSolomon verify failed with %s", err)
+					}).Errorf("ReedSolomon verify failed with %s", err)
 					pipeWriter.CloseWithError(err)
 					return
 				}
@@ -171,7 +171,7 @@ func (xl XL) ReadFile(volume, path string, offset int64) (io.ReadCloser, error)
 					log.WithFields(logrus.Fields{
 						"volume": volume,
 						"path":   path,
-					}).Debugf("%s", err)
+					}).Errorf("%s", err)
 					pipeWriter.CloseWithError(err)
 					return
 				}
@@ -183,7 +183,7 @@ func (xl XL) ReadFile(volume, path string, offset int64) (io.ReadCloser, error)
 				log.WithFields(logrus.Fields{
 					"volume": volume,
 					"path":   path,
-				}).Debugf("ReedSolomon joining decoded blocks failed with %s", err)
+				}).Errorf("ReedSolomon joining decoded blocks failed with %s", err)
 				pipeWriter.CloseWithError(err)
 				return
 			}

xl-v1.go

@@ -166,7 +166,7 @@ func (xl XL) MakeVol(volume string) error {
 		if err := disk.MakeVol(volume); err != nil {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
-			}).Debugf("MakeVol failed with %s", err)
+			}).Errorf("MakeVol failed with %s", err)
 			// We ignore error if errVolumeExists and creating a volume again.
 			if err == errVolumeExists {
 				volumeExistsMap[index] = struct{}{}
@@ -196,7 +196,7 @@ func (xl XL) DeleteVol(volume string) error {
 		if err := disk.DeleteVol(volume); err != nil {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
-			}).Debugf("DeleteVol failed with %s", err)
+			}).Errorf("DeleteVol failed with %s", err)
 			// We ignore error if errVolumeNotFound.
 			if err == errVolumeNotFound {
 				volumeNotFoundMap[index] = struct{}{}
@@ -269,7 +269,7 @@ func (xl XL) StatVol(volume string) (volInfo VolInfo, err error) {
 		} else if err != nil {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
-			}).Debugf("StatVol failed with %s", err)
+			}).Errorf("StatVol failed with %s", err)
 			return VolInfo{}, err
 		}
 	}
@@ -304,7 +304,7 @@ func (xl XL) isLeafDirectory(volume, leafPath string) (isLeaf bool) {
 				"markerPath": markerPath,
 				"recursive":  false,
 				"count":      1000,
-			}).Debugf("ListFiles failed with %s", err)
+			}).Errorf("ListFiles failed with %s", err)
 			break
 		}
 		allFileInfos = append(allFileInfos, fileInfos...)
@@ -340,7 +340,7 @@ func (xl XL) extractMetadata(volume, path string) (fileMetadata, error) {
 			"volume": volume,
 			"path":   metadataFilePath,
 			"offset": offset,
-		}).Debugf("ReadFile failed with %s", err)
+		}).Errorf("ReadFile failed with %s", err)
 		return nil, err
 	}
 	// Close metadata reader.
@@ -352,7 +352,7 @@ func (xl XL) extractMetadata(volume, path string) (fileMetadata, error) {
 			"volume": volume,
 			"path":   metadataFilePath,
 			"offset": offset,
-		}).Debugf("fileMetadataDecode failed with %s", err)
+		}).Errorf("fileMetadataDecode failed with %s", err)
 		return nil, err
 	}
 	return metadata, nil
@@ -369,7 +369,7 @@ func (xl XL) extractFileInfo(volume, path string) (FileInfo, error) {
 		log.WithFields(logrus.Fields{
 			"volume": volume,
 			"path":   path,
-		}).Debugf("extractMetadata failed with %s", err)
+		}).Errorf("extractMetadata failed with %s", err)
 		return FileInfo{}, err
 	}
 	fileSize, err := metadata.GetSize()
@@ -377,7 +377,7 @@ func (xl XL) extractFileInfo(volume, path string) (FileInfo, error) {
 		log.WithFields(logrus.Fields{
 			"volume": volume,
 			"path":   path,
-		}).Debugf("GetSize failed with %s", err)
+		}).Errorf("GetSize failed with %s", err)
 		return FileInfo{}, err
 	}
 	fileModTime, err := metadata.GetModTime()
@@ -385,7 +385,7 @@ func (xl XL) extractFileInfo(volume, path string) (FileInfo, error) {
 		log.WithFields(logrus.Fields{
 			"volume": volume,
 			"path":   path,
-		}).Debugf("GetModTime failed with %s", err)
+		}).Errorf("GetModTime failed with %s", err)
 		return FileInfo{}, err
 	}
 	fileInfo.Size = fileSize
@@ -428,7 +428,7 @@ func (xl XL) ListFiles(volume, prefix, marker string, recursive bool, count int)
 				"marker":    markerPath,
 				"recursive": recursive,
 				"count":     count,
-			}).Debugf("ListFiles failed with %s", err)
+			}).Errorf("ListFiles failed with %s", err)
 			return nil, true, err
 		}
 		for _, fsFileInfo := range fsFilesInfo {
@@ -450,7 +450,7 @@ func (xl XL) ListFiles(volume, prefix, marker string, recursive bool, count int)
 					log.WithFields(logrus.Fields{
 						"volume": volume,
 						"path":   path,
-					}).Debugf("extractFileInfo failed with %s", err)
+					}).Errorf("extractFileInfo failed with %s", err)
 					// For a leaf directory, if err is FileNotFound then
 					// perhaps has a missing metadata. Ignore it and let
 					// healing finish its job it will become available soon.
@@ -485,7 +485,7 @@ func (xl XL) ListFiles(volume, prefix, marker string, recursive bool, count int)
 					"marker":    markerPath,
 					"recursive": recursive,
 					"count":     1,
-				}).Debugf("ListFiles failed with %s", err)
+				}).Errorf("ListFiles failed with %s", err)
 				return nil, true, err
 			}
 			if !eof {
@@ -499,7 +499,7 @@ func (xl XL) ListFiles(volume, prefix, marker string, recursive bool, count int)
 						"volume":          volume,
 						"prefix":          prefix,
 						"fsFileInfo.Name": fsFilesInfo[0].Name,
-					}).Debugf("ListFiles failed with %s, expected %s to be a part.json file.", err, fsFilesInfo[0].Name)
+					}).Errorf("ListFiles failed with %s, expected %s to be a part.json file.", err, fsFilesInfo[0].Name)
 					return nil, true, errUnexpected
 				}
 			}
@@ -525,22 +525,22 @@ func (xl XL) StatFile(volume, path string) (FileInfo, error) {
 	// Acquire read lock.
 	readLock := true
 	xl.lockNS(volume, path, readLock)
-	_, metadata, doSelfHeal, err := xl.getReadableDisks(volume, path)
+	_, metadata, heal, err := xl.listOnlineDisks(volume, path)
 	xl.unlockNS(volume, path, readLock)
 	if err != nil {
 		log.WithFields(logrus.Fields{
 			"volume": volume,
 			"path":   path,
-		}).Debugf("getReadableDisks failed with %s", err)
+		}).Errorf("getReadableDisks failed with %s", err)
 		return FileInfo{}, err
 	}
 
-	if doSelfHeal {
+	if heal {
-		if err = xl.doHealFile(volume, path); err != nil {
+		if err = xl.healFile(volume, path); err != nil {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
 				"path":   path,
-			}).Debugf("doHealFile failed with %s", err)
+			}).Errorf("doHealFile failed with %s", err)
 			return FileInfo{}, err
 		}
 	}
@@ -551,7 +551,7 @@ func (xl XL) StatFile(volume, path string) (FileInfo, error) {
 		log.WithFields(logrus.Fields{
 			"volume": volume,
 			"path":   path,
-		}).Debugf("GetSize failed with %s", err)
+		}).Errorf("GetSize failed with %s", err)
 		return FileInfo{}, err
 	}
 	modTime, err := metadata.GetModTime()
@@ -559,7 +559,7 @@ func (xl XL) StatFile(volume, path string) (FileInfo, error) {
 		log.WithFields(logrus.Fields{
 			"volume": volume,
 			"path":   path,
-		}).Debugf("GetModTime failed with %s", err)
+		}).Errorf("GetModTime failed with %s", err)
 		return FileInfo{}, err
 	}
 
@@ -589,7 +589,7 @@ func (xl XL) DeleteFile(volume, path string) error {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
 				"path":   path,
-			}).Debugf("DeleteFile failed with %s", err)
+			}).Errorf("DeleteFile failed with %s", err)
 			return err
 		}
 		metadataFilePath := slashpath.Join(path, metadataFile)
@@ -598,7 +598,7 @@ func (xl XL) DeleteFile(volume, path string) error {
 			log.WithFields(logrus.Fields{
 				"volume": volume,
 				"path":   path,
-			}).Debugf("DeleteFile failed with %s", err)
+			}).Errorf("DeleteFile failed with %s", err)
 			return err
 		}
 	}