heal: Refactor heal command. (#2901)

- return errors for heal operation through rpc replies.
  - implement rotating wheel for healing status.

Fixes #2491

.travis.yml

@@ -6,9 +6,9 @@ language: go
 
 os:
 - linux
-- osx
+#- osx
 
-osx_image: xcode7.2
+#osx_image: xcode7.2
 
 env:
 - ARCH=x86_64

cmd/control-handlers.go

@@ -68,7 +68,7 @@ type HealListArgs struct {
 type HealListReply struct {
 	IsTruncated bool
 	NextMarker  string
-	Objects     []string
+	Objects     []ObjectInfo
 }
 
 // ListObjects - list all objects that needs healing.
@@ -80,35 +80,30 @@ func (c *controlAPIHandlers) ListObjectsHealHandler(args *HealListArgs, reply *H
 	if !isRPCTokenValid(args.Token) {
 		return errInvalidToken
 	}
+	if !c.IsXL {
+		return nil
+	}
 	info, err := objAPI.ListObjectsHeal(args.Bucket, args.Prefix, args.Marker, args.Delimiter, args.MaxKeys)
 	if err != nil {
 		return err
 	}
 	reply.IsTruncated = info.IsTruncated
 	reply.NextMarker = info.NextMarker
-	for _, obj := range info.Objects {
-		reply.Objects = append(reply.Objects, obj.Name)
-	}
+	reply.Objects = info.Objects
 	return nil
 }
 
-// HealObjectArgs - argument for HealObject RPC.
-type HealObjectArgs struct {
+// HealBucketArgs - arguments for HealBucket RPC.
+type HealBucketArgs struct {
 	// Authentication token generated by Login.
 	GenericArgs
 
-	// Name of the bucket.
+	// Bucket to be healed.
 	Bucket string
-
-	// Name of the object.
-	Object string
 }
 
-// HealObjectReply - reply by HealObject RPC.
-type HealObjectReply struct{}
-
-// HealObject - heal the object.
-func (c *controlAPIHandlers) HealObjectHandler(args *HealObjectArgs, reply *GenericReply) error {
+// Heals missing buckets across disks, if we have enough quorum.
+func (c *controlAPIHandlers) HealBucketHandler(args *HealBucketArgs, reply *GenericReply) error {
 	objAPI := c.ObjectAPI()
 	if objAPI == nil {
 		return errServerNotInitialized
@@ -116,15 +111,72 @@ func (c *controlAPIHandlers) HealObjectHandler(args *HealObjectArgs, reply *Gene
 	if !isRPCTokenValid(args.Token) {
 		return errInvalidToken
 	}
-	return objAPI.HealObject(args.Bucket, args.Object)
+	if !c.IsXL {
+		return nil
+	}
+	// Proceed to heal the bucket.
+	return objAPI.HealBucket(args.Bucket)
 }
 
-// HealObject - heal the object.
-func (c *controlAPIHandlers) HealDiskMetadataHandler(args *GenericArgs, reply *GenericReply) error {
+// HealObjectArgs - argument for HealObject RPC.
+type HealObjectArgs struct {
+	// Authentication token generated by Login.
+	GenericArgs
+
+	// Name of the bucket where the object
+	// needs to be healed.
+	Bucket string
+
+	// Name of the object to be healed.
+	Objects []ObjectInfo
+}
+
+// HealObjectReply - reply by HealObject RPC.
+type HealObjectReply struct {
+	Results []string
+}
+
+// HealObject heals 1000 objects at a time for missing chunks, missing metadata on a given bucket.
+func (c *controlAPIHandlers) HealObjectsHandler(args *HealObjectArgs, reply *HealObjectReply) error {
+	objAPI := c.ObjectAPI()
+	if objAPI == nil {
+		return errServerNotInitialized
+	}
 	if !isRPCTokenValid(args.Token) {
 		return errInvalidToken
 	}
-	err := repairDiskMetadata(c.StorageDisks)
+	if !c.IsXL {
+		return nil
+	}
+
+	// Heal all objects that need healing.
+	var errs = make([]error, len(args.Objects))
+	for idx, objInfo := range args.Objects {
+		errs[idx] = objAPI.HealObject(args.Bucket, objInfo.Name)
+	}
+
+	// Get all the error causes.
+	var causes = make([]string, len(args.Objects))
+	for id, err := range errs {
+		if err != nil {
+			causes[id] = err.Error()
+		}
+	}
+
+	// Save the causes.
+	reply.Results = causes
+	return nil
+}
+
+// Heals backend storage format.
+func (c *controlAPIHandlers) HealFormatHandler(args *GenericArgs, reply *GenericReply) error {
+	if !isRPCTokenValid(args.Token) {
+		return errInvalidToken
+	}
+	if !c.IsXL {
+		return nil
+	}
+	err := healFormatXL(c.StorageDisks)
 	if err != nil {
 		return err
 	}
@@ -214,6 +266,9 @@ func (c *controlAPIHandlers) TryInitHandler(args *GenericArgs, reply *GenericRep
 	if !isRPCTokenValid(args.Token) {
 		return errInvalidToken
 	}
+	if !c.IsXL {
+		return nil
+	}
 	go func() {
 		globalWakeupCh <- struct{}{}
 	}()

cmd/control-heal-main.go

@@ -17,12 +17,13 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
 	"net/url"
 	"path"
-	"strings"
 
 	"github.com/minio/cli"
+	"github.com/minio/mc/pkg/console"
 )
 
 var healCmd = cli.Command{
@@ -41,48 +42,154 @@ FLAGS:
   {{end}}
 
 EXAMPLES:
-  1. Heal an object.
+  1. Heal missing on-disk format across all inconsistent nodes.
+     $ minio control {{.Name}} http://localhost:9000
+
+  2. Heals a specific object.
      $ minio control {{.Name}} http://localhost:9000/songs/classical/western/piano.mp3
 
-  2. Heal all objects in a bucket recursively.
-     $ minio control {{.Name}}  http://localhost:9000/songs
+  3. Heal bucket and all objects in a bucket recursively.
+     $ minio control {{.Name}} http://localhost:9000/songs
 
-  3. Heall all objects with a given prefix recursively.
-     $ minio control {{.Name}} http://localhost:9000/songs/classical/
+  4. Heal all objects with a given prefix recursively.
+     $ minio control {{.Name}} http://localhost:9000/songs/classical/  
 `,
 }
 
-func checkHealControlSyntax(ctx *cli.Context) {
-	if len(ctx.Args()) != 1 {
-		cli.ShowCommandHelpAndExit(ctx, "heal", 1)
-	}
+// heals backend storage format, useful in restoring `format.json` missing on a
+// fresh or corrupted disks.  This call does deep inspection of backend layout
+// and applies appropriate `format.json` to the disk.
+func healStorageFormat(authClnt *AuthRPCClient) error {
+	args := &GenericArgs{}
+	reply := &GenericReply{}
+	return authClnt.Call("Control.HealFormatHandler", args, reply)
 }
 
-// "minio control heal" entry point.
-func healControl(ctx *cli.Context) {
+// lists all objects which needs to be healed, this is a precursor helper function called before
+// calling actual healing operation. Returns a maximum of 1000 objects that needs healing at a time.
+// Marker indicates the next entry point where the listing will start.
+func listObjectsHeal(authClnt *AuthRPCClient, bucketName, prefixName, markerName string) (*HealListReply, error) {
+	args := &HealListArgs{
+		Bucket:    bucketName,
+		Prefix:    prefixName,
+		Marker:    markerName,
+		Delimiter: "",
+		MaxKeys:   1000,
+	}
+	reply := &HealListReply{}
+	err := authClnt.Call("Control.ListObjectsHealHandler", args, reply)
+	if err != nil {
+		return nil, err
+	}
+	return reply, nil
+}
 
-	checkHealControlSyntax(ctx)
+// Internal custom struct encapsulates pretty msg to be printed by the caller.
+type healMsg struct {
+	Msg string
+	Err error
+}
 
-	// Parse bucket and object from url.URL.Path
-	parseBucketObject := func(path string) (bucketName string, objectName string) {
-		splits := strings.SplitN(path, string(slashSeparator), 3)
-		switch len(splits) {
-		case 0, 1:
-			bucketName = ""
-			objectName = ""
-		case 2:
-			bucketName = splits[1]
-			objectName = ""
-		case 3:
-			bucketName = splits[1]
-			objectName = splits[2]
+// Prettifies heal results and returns them over a channel, caller reads from this channel and prints.
+func prettyHealResults(healedObjects []ObjectInfo, healReply *HealObjectReply) <-chan healMsg {
+	var msgCh = make(chan healMsg)
 
+	// Starts writing to message channel for the list of results sent back
+	// by a previous healing operation.
+	go func(msgCh chan<- healMsg) {
+		defer close(msgCh)
+		// Go through all the results and validate if we have success or failure.
+		for i, healStr := range healReply.Results {
+			objPath := path.Join(healedObjects[i].Bucket, healedObjects[i].Name)
+			// TODO: We need to still print heal error cause.
+			if healStr != "" {
+				msgCh <- healMsg{
+					Msg: fmt.Sprintf("%s  %s", colorRed("FAILED"), objPath),
+					Err: errors.New(healStr),
+				}
+				continue
+			}
+			msgCh <- healMsg{
+				Msg: fmt.Sprintf("%s  %s", colorGreen("SUCCESS"), objPath),
+			}
 		}
-		return bucketName, objectName
+	}(msgCh)
+
+	// Return ..
+	return msgCh
+}
+
+var scanBar = scanBarFactory()
+
+// Heals all the objects under a given bucket, optionally you can specify an
+// object prefix to heal objects under this prefix.
+func healObjects(authClnt *AuthRPCClient, bucketName, prefixName string) error {
+	if authClnt == nil || bucketName == "" {
+		return errInvalidArgument
+	}
+	// Save marker for the next request.
+	var markerName string
+	for {
+		healListReply, err := listObjectsHeal(authClnt, bucketName, prefixName, markerName)
+		if err != nil {
+			return err
+		}
+
+		// Attempt to heal only if there are any objects to heal.
+		if len(healListReply.Objects) > 0 {
+			healArgs := &HealObjectArgs{
+				Bucket:  bucketName,
+				Objects: healListReply.Objects,
+			}
+
+			healReply := &HealObjectReply{}
+			err = authClnt.Call("Control.HealObjectsHandler", healArgs, healReply)
+			if err != nil {
+				return err
+			}
+
+			// Pretty print all the heal results.
+			for msg := range prettyHealResults(healArgs.Objects, healReply) {
+				if msg.Err != nil {
+					// TODO we need to print the error cause as well.
+					scanBar(msg.Msg)
+					continue
+				}
+				// Success.
+				scanBar(msg.Msg)
+			}
+		}
+
+		// End of listing objects for healing.
+		if !healListReply.IsTruncated {
+			break
+		}
+
+		// Set the marker to list the next set of keys.
+		markerName = healListReply.NextMarker
+
+	}
+	return nil
+}
+
+// Heals your bucket for any missing entries.
+func healBucket(authClnt *AuthRPCClient, bucketName string) error {
+	if authClnt == nil || bucketName == "" {
+		return errInvalidArgument
+	}
+	return authClnt.Call("Control.HealBucketHandler", &HealBucketArgs{
+		Bucket: bucketName,
+	}, &GenericReply{})
+}
+
+// Entry point for minio control heal command.
+func healControl(ctx *cli.Context) {
+	if ctx.Args().Present() && len(ctx.Args()) != 1 {
+		cli.ShowCommandHelpAndExit(ctx, "heal", 1)
 	}
 
-	parsedURL, err := url.Parse(ctx.Args()[0])
-	fatalIf(err, "Unable to parse URL")
+	parsedURL, err := url.Parse(ctx.Args().Get(0))
+	fatalIf(err, "Unable to parse URL %s", ctx.Args().Get(0))
 
 	authCfg := &authConfig{
 		accessKey:   serverConfig.GetCredential().AccessKeyID,
@@ -92,71 +199,19 @@ func healControl(ctx *cli.Context) {
 		path:        path.Join(reservedBucket, controlPath),
 		loginMethod: "Control.LoginHandler",
 	}
+
 	client := newAuthClient(authCfg)
-
-	// Always try to fix disk metadata
-	fmt.Print("Checking and healing disk metadata..")
-	args := &GenericArgs{}
-	reply := &GenericReply{}
-	err = client.Call("Control.HealDiskMetadataHandler", args, reply)
-	fatalIf(err, "Unable to heal disk metadata.")
-	fmt.Println(" ok")
-
-	bucketName, objectName := parseBucketObject(parsedURL.Path)
-	if bucketName == "" {
+	if parsedURL.Path == "/" || parsedURL.Path == "" {
+		err = healStorageFormat(client)
+		fatalIf(err, "Unable to heal disk metadata.")
 		return
 	}
-
-	// If object does not have trailing "/" then it's an object, hence heal it.
-	if objectName != "" && !strings.HasSuffix(objectName, slashSeparator) {
-		fmt.Printf("Healing : /%s/%s\n", bucketName, objectName)
-		args := &HealObjectArgs{Bucket: bucketName, Object: objectName}
-		reply := &HealObjectReply{}
-		err = client.Call("Control.HealObjectHandler", args, reply)
-		errorIf(err, "Healing object %s failed.", objectName)
-		return
-	}
-
-	// If object is "" then heal the bucket first.
-	if objectName == "" {
-		fmt.Printf("Healing : /%s\n", bucketName)
-		args := &HealObjectArgs{Bucket: bucketName, Object: ""}
-		reply := &HealObjectReply{}
-		err = client.Call("Control.HealObjectHandler", args, reply)
-		fatalIf(err, "Healing bucket %s failed.", bucketName)
-		// Continue to heal the objects in the bucket.
-	}
-
-	// Recursively list and heal the objects.
-	prefix := objectName
-	marker := ""
-	for {
-		args := &HealListArgs{
-			Bucket:    bucketName,
-			Prefix:    prefix,
-			Marker:    marker,
-			Delimiter: "",
-			MaxKeys:   1000,
-		}
-		reply := &HealListReply{}
-		err = client.Call("Control.ListObjectsHealHandler", args, reply)
-		fatalIf(err, "Unable to list objects for healing.")
-
-		// Heal the objects returned in the ListObjects reply.
-		for _, obj := range reply.Objects {
-			fmt.Printf("Healing : /%s/%s\n", bucketName, obj)
-			reply := &GenericReply{}
-			healArgs := &HealObjectArgs{Bucket: bucketName, Object: obj}
-			err = client.Call("Control.HealObjectHandler", healArgs, reply)
-			errorIf(err, "Healing object %s failed.", obj)
-		}
-
-		if !reply.IsTruncated {
-			// End of listing.
-			break
-		}
-
-		// Set the marker to list the next set of keys.
-		marker = reply.NextMarker
-	}
+	bucketName, prefixName := urlPathSplit(parsedURL.Path)
+	// Heal the bucket.
+	err = healBucket(client, bucketName)
+	fatalIf(err, "Unable to heal bucket %s", bucketName)
+	// Heal all the objects.
+	err = healObjects(client, bucketName, prefixName)
+	fatalIf(err, "Unable to heal objects on bucket %s at prefix %s", bucketName, prefixName)
+	console.Println()
 }

cmd/control-mains_test.go

@@ -17,6 +17,10 @@
 package cmd
 
 import (
+	"bytes"
+	"crypto/rand"
+	"os"
+	"path"
 	"testing"
 
 	"github.com/minio/cli"
@@ -43,7 +47,49 @@ func TestControlHealMain(t *testing.T) {
 	// run app
 	err := app.Run(args)
 	if err != nil {
-		t.Errorf("Control-Heal-Main test failed with - %s", err.Error())
+		t.Errorf("Control-Heal-Format-Main test failed with - %s", err.Error())
+	}
+
+	obj := newObjectLayerFn()
+	// Create "bucket"
+	err = obj.MakeBucket("bucket")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	bucket := "bucket"
+	object := "object"
+
+	data := make([]byte, 1*1024*1024)
+	length := int64(len(data))
+	_, err = rand.Read(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = obj.PutObject(bucket, object, length, bytes.NewReader(data), nil, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Remove the object - to simulate the case where the disk was down when the object was created.
+	err = os.RemoveAll(path.Join(testServer.Disks[0], bucket, object))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	args = []string{"./minio", "control", "heal", url + "/bucket"}
+	// run app
+	err = app.Run(args)
+	if err != nil {
+		t.Errorf("Control-Heal-Bucket-Main test failed with - %s", err.Error())
+	}
+
+	args = []string{"./minio", "control", "heal", url + "/bucket/object"}
+	// run app
+	err = app.Run(args)
+	if err != nil {
+		t.Errorf("Control-Heal-Bucket-With-Prefix-Main test failed with - %s", err.Error())
 	}
 }
 

cmd/control-router.go

@@ -73,9 +73,10 @@ func initRemoteControlClients(srvCmdConfig serverCmdConfig) []*AuthRPCClient {
 // operations on server.
 type controlAPIHandlers struct {
 	ObjectAPI      func() ObjectLayer
-	StorageDisks   []StorageAPI
+	IsXL           bool
 	RemoteControls []*AuthRPCClient
 	LocalNode      string
+	StorageDisks   []StorageAPI
 }
 
 // Register control RPC handlers.
@@ -83,6 +84,7 @@ func registerControlRPCRouter(mux *router.Router, srvCmdConfig serverCmdConfig)
 	// Initialize Control.
 	ctrlHandlers := &controlAPIHandlers{
 		ObjectAPI:      newObjectLayerFn,
+		IsXL:           srvCmdConfig.isDistXL || len(srvCmdConfig.storageDisks) > 1,
 		RemoteControls: initRemoteControlClients(srvCmdConfig),
 		LocalNode:      getLocalAddress(srvCmdConfig),
 		StorageDisks:   srvCmdConfig.storageDisks,

cmd/control_test.go

@@ -270,77 +270,91 @@ func (s *TestRPCControlSuite) testRPCControlLock(c *testing.T) {
 }
 
 func TestControlHealDiskMetadataH(t *testing.T) {
-	//setup code
+	// Setup code
 	s := &TestRPCControlSuite{serverType: "XL"}
 	s.SetUpSuite(t)
 
-	//run test
-	s.testControlHealDiskMetadataH(t)
+	// Run test
+	s.testControlHealFormatH(t)
 
-	//teardown code
+	// Teardown code
 	s.TearDownSuite(t)
 }
 
-// TestControlHandlerHealDiskMetadata - Registers and call the `HealDiskMetadataHandler`, asserts to validate the success.
-func (s *TestRPCControlSuite) testControlHealDiskMetadataH(c *testing.T) {
+// TestControlHandlerHealFormat - Registers and call the `HealFormatHandler`, asserts to validate the success.
+func (s *TestRPCControlSuite) testControlHealFormatH(c *testing.T) {
 	// The suite has already started the test RPC server, just send RPC calls.
 	client := newAuthClient(s.testAuthConf)
 	defer client.Close()
 
 	args := &GenericArgs{}
 	reply := &GenericReply{}
-	err := client.Call("Control.HealDiskMetadataHandler", args, reply)
+	err := client.Call("Control.HealFormatHandler", args, reply)
 	if err != nil {
-		c.Errorf("Control.HealDiskMetadataH - test failed with <ERROR> %s", err)
+		c.Errorf("Test failed with <ERROR> %s", err)
 	}
 }
 
 func TestControlHealObjectH(t *testing.T) {
-	//setup code
+	// Setup code
 	s := &TestRPCControlSuite{serverType: "XL"}
 	s.SetUpSuite(t)
 
-	//run test
-	s.testControlHealObjectH(t)
+	// Run test
+	s.testControlHealObjectsH(t)
 
-	//teardown code
+	// Teardown code
 	s.TearDownSuite(t)
 }
 
-func (s *TestRPCControlSuite) testControlHealObjectH(t *testing.T) {
+func (s *TestRPCControlSuite) testControlHealObjectsH(t *testing.T) {
 	client := newAuthClient(s.testAuthConf)
 	defer client.Close()
 
-	err := newObjectLayerFn().MakeBucket("testbucket")
+	objAPI := newObjectLayerFn()
+
+	err := objAPI.MakeBucket("testbucket")
 	if err != nil {
-		t.Fatalf(
-			"Control.HealObjectH - create bucket failed with <ERROR> %s", err)
+		t.Fatalf("Create bucket failed with <ERROR> %s", err)
 	}
 
 	datum := strings.NewReader("a")
-	_, err = newObjectLayerFn().PutObject("testbucket", "testobject", 1, datum, nil, "")
+	_, err = objAPI.PutObject("testbucket", "testobject1", 1, datum, nil, "")
 	if err != nil {
-		t.Fatalf("Control.HealObjectH - put object failed with <ERROR> %s", err)
+		t.Fatalf("Put object failed with <ERROR> %s", err)
+	}
+	datum = strings.NewReader("a")
+	_, err = objAPI.PutObject("testbucket", "testobject2", 1, datum, nil, "")
+	if err != nil {
+		t.Fatalf("Put object failed with <ERROR> %s", err)
 	}
 
-	args := &HealObjectArgs{GenericArgs{}, "testbucket", "testobject"}
-	reply := &GenericReply{}
-	err = client.Call("Control.HealObjectHandler", args, reply)
-
+	args := &HealObjectArgs{
+		Bucket: "testbucket",
+		Objects: []ObjectInfo{
+			{
+				Name: "testobject1",
+			}, {
+				Name: "testobject2",
+			},
+		},
+	}
+	reply := &HealObjectReply{}
+	err = client.Call("Control.HealObjectsHandler", args, reply)
 	if err != nil {
-		t.Errorf("Control.HealObjectH - test failed with <ERROR> %s", err)
+		t.Errorf("Test failed with <ERROR> %s", err)
 	}
 }
 
 func TestControlListObjectsHealH(t *testing.T) {
-	//setup code
+	// Setup code
 	s := &TestRPCControlSuite{serverType: "XL"}
 	s.SetUpSuite(t)
 
-	//run test
+	// Run test
 	s.testControlListObjectsHealH(t)
 
-	//teardown code
+	// Teardown code
 	s.TearDownSuite(t)
 }
 
@@ -348,17 +362,18 @@ func (s *TestRPCControlSuite) testControlListObjectsHealH(t *testing.T) {
 	client := newAuthClient(s.testAuthConf)
 	defer client.Close()
 
-	// careate a bucket
-	err := newObjectLayerFn().MakeBucket("testbucket")
+	objAPI := newObjectLayerFn()
+
+	// Create a bucket
+	err := objAPI.MakeBucket("testbucket")
 	if err != nil {
-		t.Fatalf(
-			"Control.ListObjectsHealH - create bucket failed - %s", err)
+		t.Fatalf("Create bucket failed - %s", err)
 	}
 
 	r := strings.NewReader("0")
-	_, err = newObjectLayerFn().PutObject("testbucket", "testObj-0", 1, r, nil, "")
+	_, err = objAPI.PutObject("testbucket", "testObj-0", 1, r, nil, "")
 	if err != nil {
-		t.Fatalf("Control.ListObjectsHealH - object creation failed - %s", err)
+		t.Fatalf("Object creation failed - %s", err)
 	}
 
 	args := &HealListArgs{
@@ -367,8 +382,7 @@ func (s *TestRPCControlSuite) testControlListObjectsHealH(t *testing.T) {
 	}
 	reply := &GenericReply{}
 	err = client.Call("Control.ListObjectsHealHandler", args, reply)
-
 	if err != nil {
-		t.Errorf("Control.ListObjectsHealHandler - test failed - %s", err)
+		t.Errorf("Test failed - %s", err)
 	}
 }

cmd/errors.go

@@ -111,12 +111,12 @@ func errorCause(err error) error {
 
 // Returns slice of underlying cause error.
 func errorsCause(errs []error) []error {
-	Errs := make([]error, len(errs))
+	cerrs := make([]error, len(errs))
 	for i, err := range errs {
 		if err == nil {
 			continue
 		}
-		Errs[i] = errorCause(err)
+		cerrs[i] = errorCause(err)
 	}
-	return Errs
+	return cerrs
 }

cmd/format-config-v1.go

@@ -743,9 +743,10 @@ func healFormatXLCorruptedDisks(storageDisks []StorageAPI) error {
 
 // loadFormatXL - loads XL `format.json` and returns back properly
 // ordered storage slice based on `format.json`.
-func loadFormatXL(bootstrapDisks []StorageAPI) (disks []StorageAPI, err error) {
+func loadFormatXL(bootstrapDisks []StorageAPI, readQuorum int) (disks []StorageAPI, err error) {
 	var unformattedDisksFoundCnt = 0
 	var diskNotFoundCount = 0
+	var corruptedDisksFoundCnt = 0
 	formatConfigs := make([]*formatConfigV1, len(bootstrapDisks))
 
 	// Try to load `format.json` bootstrap disks.
@@ -763,6 +764,9 @@ func loadFormatXL(bootstrapDisks []StorageAPI) (disks []StorageAPI, err error) {
 			} else if err == errDiskNotFound {
 				diskNotFoundCount++
 				continue
+			} else if err == errCorruptedFormat {
+				corruptedDisksFoundCnt++
+				continue
 			}
 			return nil, err
 		}
@@ -771,11 +775,13 @@ func loadFormatXL(bootstrapDisks []StorageAPI) (disks []StorageAPI, err error) {
 	}
 
 	// If all disks indicate that 'format.json' is not available return 'errUnformattedDisk'.
-	if unformattedDisksFoundCnt > len(bootstrapDisks)-(len(bootstrapDisks)/2+1) {
+	if unformattedDisksFoundCnt > len(bootstrapDisks)-readQuorum {
 		return nil, errUnformattedDisk
+	} else if corruptedDisksFoundCnt > len(bootstrapDisks)-readQuorum {
+		return nil, errCorruptedFormat
 	} else if diskNotFoundCount == len(bootstrapDisks) {
 		return nil, errDiskNotFound
-	} else if diskNotFoundCount > len(bootstrapDisks)-(len(bootstrapDisks)/2+1) {
+	} else if diskNotFoundCount > len(bootstrapDisks)-readQuorum {
 		return nil, errXLReadQuorum
 	}
 

cmd/format-config-v1_test.go

@@ -292,7 +292,7 @@ func TestFormatXLHealFreshDisks(t *testing.T) {
 	}
 
 	// Load again XL format.json to validate it
-	_, err = loadFormatXL(storageDisks)
+	_, err = loadFormatXL(storageDisks, 8)
 	if err != nil {
 		t.Fatal("loading healed disk failed: ", err)
 	}
@@ -322,7 +322,7 @@ func TestFormatXLHealFreshDisksErrorExpected(t *testing.T) {
 	prepareNOfflineDisks(storageDisks, 16, t)
 
 	// Load again XL format.json to validate it
-	_, err = loadFormatXL(storageDisks)
+	_, err = loadFormatXL(storageDisks, 8)
 	if err == nil {
 		t.Fatal("loading format disk error")
 	}
@@ -401,7 +401,7 @@ func TestFormatXLHealCorruptedDisks(t *testing.T) {
 	}
 
 	// Load again XL format.json to validate it
-	_, err = loadFormatXL(permutedStorageDisks)
+	_, err = loadFormatXL(permutedStorageDisks, 8)
 	if err != nil {
 		t.Fatal("loading healed disk failed: ", err)
 	}
@@ -709,7 +709,7 @@ func TestLoadFormatXLErrs(t *testing.T) {
 		t.Fatal("storage disk is not *posix type")
 	}
 	xl.storageDisks[10] = newNaughtyDisk(posixDisk, nil, errFaultyDisk)
-	if _, err = loadFormatXL(xl.storageDisks); err != errFaultyDisk {
+	if _, err = loadFormatXL(xl.storageDisks, 8); err != errFaultyDisk {
 		t.Fatal("Got an unexpected error: ", err)
 	}
 
@@ -735,7 +735,7 @@ func TestLoadFormatXLErrs(t *testing.T) {
 		}
 		xl.storageDisks[i] = newNaughtyDisk(posixDisk, nil, errDiskNotFound)
 	}
-	if _, err = loadFormatXL(xl.storageDisks); err != errXLReadQuorum {
+	if _, err = loadFormatXL(xl.storageDisks, 8); err != errXLReadQuorum {
 		t.Fatal("Got an unexpected error: ", err)
 	}
 
@@ -757,7 +757,7 @@ func TestLoadFormatXLErrs(t *testing.T) {
 			t.Fatal(err)
 		}
 	}
-	if _, err = loadFormatXL(xl.storageDisks); err != errUnformattedDisk {
+	if _, err = loadFormatXL(xl.storageDisks, 8); err != errUnformattedDisk {
 		t.Fatal("Got an unexpected error: ", err)
 	}
 
@@ -777,7 +777,7 @@ func TestLoadFormatXLErrs(t *testing.T) {
 	for i := 0; i < 16; i++ {
 		xl.storageDisks[i] = nil
 	}
-	if _, err := loadFormatXL(xl.storageDisks); err != errDiskNotFound {
+	if _, err := loadFormatXL(xl.storageDisks, 8); err != errDiskNotFound {
 		t.Fatal("Got an unexpected error: ", err)
 	}
 }

cmd/fs-v1.go

@@ -643,7 +643,12 @@ func (fs fsObjects) HealObject(bucket, object string) error {
 	return traceError(NotImplemented{})
 }
 
-// HealListObjects - list objects for healing. Valid only for XL
+// HealBucket - no-op for fs, Valid only for XL.
+func (fs fsObjects) HealBucket(bucket string) error {
+	return traceError(NotImplemented{})
+}
+
+// ListObjectsHeal - list all objects to be healed. Valid only for XL
 func (fs fsObjects) ListObjectsHeal(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
 	return ListObjectsInfo{}, traceError(NotImplemented{})
 }

cmd/globals.go

@@ -76,6 +76,8 @@ var (
 
 // global colors.
 var (
-	colorBlue = color.New(color.FgBlue).SprintfFunc()
-	colorBold = color.New(color.Bold).SprintFunc()
+	colorRed   = color.New(color.FgRed).SprintFunc()
+	colorBold  = color.New(color.Bold).SprintFunc()
+	colorBlue  = color.New(color.FgBlue).SprintfFunc()
+	colorGreen = color.New(color.FgGreen).SprintfFunc()
 )

cmd/object-interface.go

@@ -30,14 +30,12 @@ type ObjectLayer interface {
 	ListBuckets() (buckets []BucketInfo, err error)
 	DeleteBucket(bucket string) error
 	ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (result ListObjectsInfo, err error)
-	ListObjectsHeal(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error)
 
 	// Object operations.
 	GetObject(bucket, object string, startOffset int64, length int64, writer io.Writer) (err error)
 	GetObjectInfo(bucket, object string) (objInfo ObjectInfo, err error)
 	PutObject(bucket, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (objInto ObjectInfo, err error)
 	DeleteObject(bucket, object string) error
-	HealObject(bucket, object string) error
 
 	// Multipart operations.
 	ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (result ListMultipartsInfo, err error)
@@ -46,4 +44,9 @@ type ObjectLayer interface {
 	ListObjectParts(bucket, object, uploadID string, partNumberMarker int, maxParts int) (result ListPartsInfo, err error)
 	AbortMultipartUpload(bucket, object, uploadID string) error
 	CompleteMultipartUpload(bucket, object, uploadID string, uploadedParts []completePart) (md5 string, err error)
+
+	// Healing operations.
+	HealBucket(bucket string) error
+	HealObject(bucket, object string) error
+	ListObjectsHeal(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error)
 }

cmd/scan-bar.go

@@ -0,0 +1,92 @@
+/*
+ * Minio Cloud Storage (C) 2016 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+
+	"github.com/cheggaaa/pb"
+	"github.com/dustin/go-humanize"
+	"github.com/minio/mc/pkg/console"
+)
+
+// fixateScanBar truncates or stretches text to fit within the terminal size.
+func fixateScanBar(text string, width int) string {
+	if len([]rune(text)) > width {
+		// Trim text to fit within the screen
+		trimSize := len([]rune(text)) - width + 3 //"..."
+		if trimSize < len([]rune(text)) {
+			text = "..." + text[trimSize:]
+		}
+	} else {
+		text += strings.Repeat(" ", width-len([]rune(text)))
+	}
+	return text
+}
+
+// Progress bar function report objects being scaned.
+type scanBarFunc func(string)
+
+// scanBarFactory returns a progress bar function to report URL scanning.
+func scanBarFactory() scanBarFunc {
+	fileCount := 0
+	termWidth, err := pb.GetTerminalWidth()
+	if err != nil {
+		termWidth = 80
+	}
+
+	// Cursor animate channel.
+	cursorCh := cursorAnimate()
+	return func(source string) {
+		scanPrefix := fmt.Sprintf("[%s] %s ", humanize.Comma(int64(fileCount)), string(<-cursorCh))
+		source = fixateScanBar(source, termWidth-len([]rune(scanPrefix)))
+		barText := scanPrefix + source
+		console.PrintC("\r" + barText + "\r")
+		fileCount++
+	}
+}
+
+// cursorAnimate - returns a animated rune through read channel for every read.
+func cursorAnimate() <-chan rune {
+	cursorCh := make(chan rune)
+	var cursors string
+
+	switch runtime.GOOS {
+	case "linux":
+		// cursors = "➩➪➫➬➭➮➯➱"
+		// cursors = "▁▃▄▅▆▇█▇▆▅▄▃"
+		cursors = "◐◓◑◒"
+		// cursors = "←↖↑↗→↘↓↙"
+		// cursors = "◴◷◶◵"
+		// cursors = "◰◳◲◱"
+		//cursors = "⣾⣽⣻⢿⡿⣟⣯⣷"
+	case "darwin":
+		cursors = "◐◓◑◒"
+	default:
+		cursors = "|/-\\"
+	}
+	go func() {
+		for {
+			for _, cursor := range cursors {
+				cursorCh <- cursor
+			}
+		}
+	}()
+	return cursorCh
+}

cmd/utils.go

@@ -163,6 +163,19 @@ func contains(stringList []string, element string) bool {
 	return false
 }
 
+// urlPathSplit - split url path into bucket and object components.
+func urlPathSplit(urlPath string) (bucketName, prefixName string) {
+	if urlPath == "" {
+		return urlPath, ""
+	}
+	urlPath = strings.TrimPrefix(urlPath, "/")
+	i := strings.Index(urlPath, "/")
+	if i != -1 {
+		return urlPath[:i], urlPath[i+1:]
+	}
+	return urlPath, ""
+}
+
 // Starts a profiler returns nil if profiler is not enabled, caller needs to handle this.
 func startProfiler(profiler string) interface {
 	Stop()

cmd/utils_test.go

@@ -124,6 +124,48 @@ func TestMaxObjectSize(t *testing.T) {
 	}
 }
 
+// Test urlPathSplit.
+func TestURLPathSplit(t *testing.T) {
+	type test struct {
+		urlPath    string
+		bucketName string
+		prefixName string
+	}
+
+	testCases := []test{
+		{
+			urlPath:    "/b/c/",
+			bucketName: "b",
+			prefixName: "c/",
+		},
+		{
+			urlPath:    "c/aa",
+			bucketName: "c",
+			prefixName: "aa",
+		},
+		{
+			urlPath:    "",
+			bucketName: "",
+			prefixName: "",
+		},
+		{
+			urlPath:    "/b",
+			bucketName: "b",
+			prefixName: "",
+		},
+	}
+
+	for i, testCase := range testCases {
+		bucketName, prefixName := urlPathSplit(testCase.urlPath)
+		if bucketName != testCase.bucketName {
+			t.Errorf("Tets %d: Expected %s, %s", i+1, testCase.bucketName, bucketName)
+		}
+		if prefixName != testCase.prefixName {
+			t.Errorf("Tets %d: Expected %s, %s", i+1, testCase.bucketName, bucketName)
+		}
+	}
+}
+
 // Tests minimum allowed part size.
 func TestMinAllowedPartSize(t *testing.T) {
 	sizes := []struct {

cmd/xl-v1-bucket.go

@@ -305,27 +305,3 @@ func (xl xlObjects) DeleteBucket(bucket string) error {
 	// Success.
 	return nil
 }
-
-// Heal bucket - create buckets on disks where it does not exist.
-func healBucket(disks []StorageAPI, bucket string) error {
-	bucketFound := false
-	for _, disk := range disks {
-		_, err := disk.StatVol(bucket)
-		if err == nil {
-			bucketFound = true
-		}
-	}
-	if !bucketFound {
-		return traceError(errVolumeNotFound)
-	}
-	for _, disk := range disks {
-		err := disk.MakeVol(bucket)
-		if err == nil {
-			continue
-		}
-		if err != errVolumeExists {
-			return traceError(err)
-		}
-	}
-	return nil
-}

cmd/xl-v1-list-objects-heal.go

@@ -17,55 +17,59 @@
 package cmd
 
 import (
-	"path"
 	"sort"
 	"strings"
 )
 
-func listDirHealFactory(disks ...StorageAPI) listDirFunc {
+func listDirHealFactory(isLeaf isLeafFunc, disks ...StorageAPI) listDirFunc {
 	// Returns sorted merged entries from all the disks.
-	listDir := func(bucket, prefixDir, prefixEntry string) (mergedentries []string, delayIsLeaf bool, err error) {
+	listDir := func(bucket, prefixDir, prefixEntry string) (mergedEntries []string, delayIsLeaf bool, err error) {
 		for _, disk := range disks {
+			if disk == nil {
+				continue
+			}
 			var entries []string
 			var newEntries []string
 			entries, err = disk.ListDir(bucket, prefixDir)
 			if err != nil {
-				// Skip the disk of listDir returns error.
 				continue
 			}
+			// Listing needs to be sorted.
+			sort.Strings(entries)
 
+			// Filter entries that have the prefix prefixEntry.
+			entries = filterMatchingPrefix(entries, prefixEntry)
+
+			// isLeaf() check has to happen here so that trailing "/" for objects can be removed.
 			for i, entry := range entries {
-				if strings.HasSuffix(entry, slashSeparator) {
-					if _, err = disk.StatFile(bucket, path.Join(prefixDir, entry, xlMetaJSONFile)); err == nil {
-						// If it is an object trim the trailing "/"
-						entries[i] = strings.TrimSuffix(entry, slashSeparator)
-					}
+				if isLeaf(bucket, pathJoin(prefixDir, entry)) {
+					entries[i] = strings.TrimSuffix(entry, slashSeparator)
 				}
 			}
-
-			if len(mergedentries) == 0 {
+			// Sort again after removing trailing "/" for objects as the previous sort
+			// does not hold good anymore.
+			sort.Strings(entries)
+			if len(mergedEntries) == 0 {
 				// For the first successful disk.ListDir()
-				mergedentries = entries
-				sort.Strings(mergedentries)
+				mergedEntries = entries
+				sort.Strings(mergedEntries)
 				continue
 			}
-
 			// find elements in entries which are not in mergedentries
 			for _, entry := range entries {
-				idx := sort.SearchStrings(mergedentries, entry)
-				if mergedentries[idx] == entry {
+				idx := sort.SearchStrings(mergedEntries, entry)
+				if mergedEntries[idx] == entry {
 					continue
 				}
 				newEntries = append(newEntries, entry)
 			}
-
 			if len(newEntries) > 0 {
 				// Merge the entries and sort it.
-				mergedentries = append(mergedentries, newEntries...)
-				sort.Strings(mergedentries)
+				mergedEntries = append(mergedEntries, newEntries...)
+				sort.Strings(mergedEntries)
 			}
 		}
-		return mergedentries, false, nil
+		return mergedEntries, false, nil
 	}
 	return listDir
 }
@@ -83,7 +87,8 @@ func (xl xlObjects) listObjectsHeal(bucket, prefix, marker, delimiter string, ma
 	walkResultCh, endWalkCh := xl.listPool.Release(listParams{bucket, recursive, marker, prefix, heal})
 	if walkResultCh == nil {
 		endWalkCh = make(chan struct{})
-		listDir := listDirHealFactory(xl.storageDisks...)
+		isLeaf := xl.isObject
+		listDir := listDirHealFactory(isLeaf, xl.storageDisks...)
 		walkResultCh = startTreeWalk(bucket, prefix, marker, recursive, listDir, nil, endWalkCh)
 	}
 

cmd/xl-v1-object.go

@@ -218,7 +218,70 @@ func (xl xlObjects) GetObject(bucket, object string, startOffset int64, length i
 	return nil
 }
 
-// HealObject - heal the object.
+func (xl xlObjects) HealBucket(bucket string) error {
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return traceError(BucketNameInvalid{Bucket: bucket})
+	}
+
+	// Heal bucket - create buckets on disks where it does not exist.
+
+	// get a random ID for lock instrumentation.
+	opsID := getOpsID()
+
+	nsMutex.Lock(bucket, "", opsID)
+	defer nsMutex.Unlock(bucket, "", opsID)
+
+	// Initialize sync waitgroup.
+	var wg = &sync.WaitGroup{}
+
+	// Initialize list of errors.
+	var dErrs = make([]error, len(xl.storageDisks))
+
+	// Make a volume entry on all underlying storage disks.
+	for index, disk := range xl.storageDisks {
+		if disk == nil {
+			dErrs[index] = traceError(errDiskNotFound)
+			continue
+		}
+		wg.Add(1)
+		// Make a volume inside a go-routine.
+		go func(index int, disk StorageAPI) {
+			defer wg.Done()
+			if _, err := disk.StatVol(bucket); err != nil {
+				if err != errVolumeNotFound {
+					dErrs[index] = traceError(err)
+					return
+				}
+				if err = disk.MakeVol(bucket); err != nil {
+					dErrs[index] = traceError(err)
+				}
+			}
+		}(index, disk)
+	}
+
+	// Wait for all make vol to finish.
+	wg.Wait()
+
+	// Do we have write quorum?.
+	if !isDiskQuorum(dErrs, xl.writeQuorum) {
+		// Purge successfully created buckets if we don't have writeQuorum.
+		xl.undoMakeBucket(bucket)
+		return toObjectErr(traceError(errXLWriteQuorum), bucket)
+	}
+
+	// Verify we have any other errors which should be returned as failure.
+	if reducedErr := reduceErrs(dErrs, []error{
+		errDiskNotFound,
+		errFaultyDisk,
+		errDiskAccessDenied,
+	}); reducedErr != nil {
+		return toObjectErr(reducedErr, bucket)
+	}
+	return nil
+}
+
+// HealObject heals a given object for all its missing entries.
 // FIXME: If an object object was deleted and one disk was down, and later the disk comes back
 // up again, heal on the object should delete it.
 func (xl xlObjects) HealObject(bucket, object string) error {
@@ -226,14 +289,9 @@ func (xl xlObjects) HealObject(bucket, object string) error {
 	if !IsValidBucketName(bucket) {
 		return traceError(BucketNameInvalid{Bucket: bucket})
 	}
-	if object == "" {
-		// Empty object name indicates that bucket should be healed.
-		return healBucket(xl.storageDisks, bucket)
-	}
 
 	// Verify if object is valid.
 	if !IsValidObjectName(object) {
-		// FIXME: return Invalid prefix.
 		return traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
 	}
 
@@ -277,8 +335,7 @@ func (xl xlObjects) HealObject(bucket, object string) error {
 		outDatedMeta := partsMetadata[index]
 		// Delete all the parts.
 		for partIndex := 0; partIndex < len(outDatedMeta.Parts); partIndex++ {
-			err := disk.DeleteFile(bucket,
-				pathJoin(object, outDatedMeta.Parts[partIndex].Name))
+			err := disk.DeleteFile(bucket, pathJoin(object, outDatedMeta.Parts[partIndex].Name))
 			if err != nil {
 				return traceError(err)
 			}
@@ -298,8 +355,8 @@ func (xl xlObjects) HealObject(bucket, object string) error {
 	// We write at temporary location and then rename to fianal location.
 	tmpID := getUUID()
 
-	// Checksum of the part files. checkSumInfos[index] will contain checksums of all the part files
-	// in the outDatedDisks[index]
+	// Checksum of the part files. checkSumInfos[index] will contain checksums
+	// of all the part files in the outDatedDisks[index]
 	checkSumInfos := make([][]checkSumInfo, len(outDatedDisks))
 
 	// Heal each part. erasureHealFile() will write the healed part to
@@ -336,6 +393,8 @@ func (xl xlObjects) HealObject(bucket, object string) error {
 		partsMetadata[index] = latestMeta
 		partsMetadata[index].Erasure.Checksum = checkSumInfos[index]
 	}
+
+	// Generate and write `xl.json` generated from other disks.
 	err := writeUniqueXLMetadata(outDatedDisks, minioMetaBucket, pathJoin(tmpMetaPrefix, tmpID), partsMetadata, diskCount(outDatedDisks))
 	if err != nil {
 		return toObjectErr(err, bucket, object)
@@ -346,7 +405,13 @@ func (xl xlObjects) HealObject(bucket, object string) error {
 		if disk == nil {
 			continue
 		}
-		err := disk.RenameFile(minioMetaBucket, retainSlash(pathJoin(tmpMetaPrefix, tmpID)), bucket, retainSlash(object))
+		// Remove any lingering partial data from current namespace.
+		err = disk.DeleteFile(bucket, retainSlash(object))
+		if err != nil && err != errFileNotFound {
+			return traceError(err)
+		}
+		// Attempt a rename now from healed data to final location.
+		err = disk.RenameFile(minioMetaBucket, retainSlash(pathJoin(tmpMetaPrefix, tmpID)), bucket, retainSlash(object))
 		if err != nil {
 			return traceError(err)
 		}

cmd/xl-v1-object_test.go

@@ -265,7 +265,8 @@ func TestPutObjectNoQuorum(t *testing.T) {
 	removeRoots(fsDirs)
 }
 
-func TestHealObject(t *testing.T) {
+// Tests both object and bucket healing.
+func TestHealing(t *testing.T) {
 	obj, fsDirs, err := prepareXL()
 	if err != nil {
 		t.Fatal(err)
@@ -346,14 +347,14 @@ func TestHealObject(t *testing.T) {
 		t.Fatal("HealObject failed")
 	}
 
-	// Remove the bucket - to simulate the case where bucket was created when the
-	// disk was down.
+	// Remove the bucket - to simulate the case where bucket was
+	// created when the disk was down.
 	err = os.RemoveAll(path.Join(fsDirs[0], bucket))
 	if err != nil {
 		t.Fatal(err)
 	}
 	// This would create the bucket.
-	err = xl.HealObject(bucket, "")
+	err = xl.HealBucket(bucket)
 	if err != nil {
 		t.Fatal(err)
 	}

cmd/xl-v1.go

@@ -75,7 +75,7 @@ var xlTreeWalkIgnoredErrs = []error{
 	errFaultyDisk,
 }
 
-func repairDiskMetadata(storageDisks []StorageAPI) error {
+func healFormatXL(storageDisks []StorageAPI) error {
 	// Attempt to load all `format.json`.
 	formatConfigs, sErrs := loadAllFormats(storageDisks)
 
@@ -116,14 +116,17 @@ func newXLObjects(storageDisks []StorageAPI) (ObjectLayer, error) {
 		return nil, err
 	}
 
+	readQuorum := len(storageDisks) / 2
+	writeQuorum := len(storageDisks)/2 + 1
+
 	// Load saved XL format.json and validate.
-	newPosixDisks, err := loadFormatXL(storageDisks)
+	newStorageDisks, err := loadFormatXL(storageDisks, readQuorum)
 	if err != nil {
 		return nil, fmt.Errorf("Unable to recognize backend format, %s", err)
 	}
 
 	// Calculate data and parity blocks.
-	dataBlocks, parityBlocks := len(newPosixDisks)/2, len(newPosixDisks)/2
+	dataBlocks, parityBlocks := len(newStorageDisks)/2, len(newStorageDisks)/2
 
 	// Initialize object cache.
 	objCache := objcache.New(globalMaxCacheSize, globalCacheExpiry)
@@ -133,7 +136,7 @@ func newXLObjects(storageDisks []StorageAPI) (ObjectLayer, error) {
 
 	// Initialize xl objects.
 	xl := xlObjects{
-		storageDisks:    newPosixDisks,
+		storageDisks:    newStorageDisks,
 		dataBlocks:      dataBlocks,
 		parityBlocks:    parityBlocks,
 		listPool:        listPool,
@@ -143,8 +146,8 @@ func newXLObjects(storageDisks []StorageAPI) (ObjectLayer, error) {
 
 	// Figure out read and write quorum based on number of storage disks.
 	// READ and WRITE quorum is always set to (N/2) number of disks.
-	xl.readQuorum = len(xl.storageDisks) / 2
-	xl.writeQuorum = len(xl.storageDisks)/2 + 1
+	xl.readQuorum = readQuorum
+	xl.writeQuorum = writeQuorum
 
 	// Return successfully initialized object layer.
 	return xl, nil
@@ -156,16 +159,6 @@ func (xl xlObjects) Shutdown() error {
 	return nil
 }
 
-// HealDiskMetadata function for object storage interface.
-func (xl xlObjects) HealDiskMetadata() error {
-	// get a random ID for lock instrumentation.
-	opsID := getOpsID()
-
-	nsMutex.Lock(minioMetaBucket, formatConfigFile, opsID)
-	defer nsMutex.Unlock(minioMetaBucket, formatConfigFile, opsID)
-	return repairDiskMetadata(xl.storageDisks)
-}
-
 // byDiskTotal is a collection satisfying sort.Interface.
 type byDiskTotal []disk.Info