Support for "directory" objects (#10499)

cmd/erasure-healing_test.go

@@ -422,7 +422,7 @@ func TestHealEmptyDirectoryErasure(t *testing.T) {
 	z := obj.(*erasureZones)
 	er := z.zones[0].sets[0]
 	firstDisk := er.getDisks()[0]
-	err = firstDisk.DeleteFile(context.Background(), bucket, object)
+	err = firstDisk.DeleteVol(context.Background(), pathJoin(bucket, encodeDirObject(object)), true)
 	if err != nil {
 		t.Fatalf("Failed to delete a file - %v", err)
 	}
@@ -434,7 +434,7 @@ func TestHealEmptyDirectoryErasure(t *testing.T) {
 	}
 
 	// Check if the empty directory is restored in the first disk
-	_, err = firstDisk.StatVol(context.Background(), pathJoin(bucket, object))
+	_, err = firstDisk.StatVol(context.Background(), pathJoin(bucket, encodeDirObject(object)))
 	if err != nil {
 		t.Fatalf("Expected object to be present but stat failed - %v", err)
 	}

cmd/erasure-metadata.go

@@ -96,21 +96,14 @@ func (fi FileInfo) IsValid() bool {
 
 // ToObjectInfo - Converts metadata to object info.
 func (fi FileInfo) ToObjectInfo(bucket, object string) ObjectInfo {
-	if HasSuffix(object, SlashSeparator) {
-		return ObjectInfo{
-			Bucket: bucket,
-			Name:   object,
-			IsDir:  true,
-		}
-	}
-
+	object = decodeDirObject(object)
 	versionID := fi.VersionID
 	if globalBucketVersioningSys.Enabled(bucket) && versionID == "" {
 		versionID = nullVersionID
 	}
 
 	objInfo := ObjectInfo{
-		IsDir:           false,
+		IsDir:           HasSuffix(object, SlashSeparator),
 		Bucket:          bucket,
 		Name:            object,
 		VersionID:       versionID,

cmd/erasure-zones.go

@@ -460,6 +460,8 @@ func (z *erasureZones) MakeBucketWithLocation(ctx context.Context, bucket string
 }
 
 func (z *erasureZones) GetObjectNInfo(ctx context.Context, bucket, object string, rs *HTTPRangeSpec, h http.Header, lockType LockType, opts ObjectOptions) (gr *GetObjectReader, err error) {
+	object = encodeDirObject(object)
+
 	for _, zone := range z.zones {
 		gr, err = zone.GetObjectNInfo(ctx, bucket, object, rs, h, lockType, opts)
 		if err != nil {
@@ -477,6 +479,8 @@ func (z *erasureZones) GetObjectNInfo(ctx context.Context, bucket, object string
 }
 
 func (z *erasureZones) GetObject(ctx context.Context, bucket, object string, startOffset int64, length int64, writer io.Writer, etag string, opts ObjectOptions) error {
+	object = encodeDirObject(object)
+
 	for _, zone := range z.zones {
 		if err := zone.GetObject(ctx, bucket, object, startOffset, length, writer, etag, opts); err != nil {
 			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
@@ -493,6 +497,7 @@ func (z *erasureZones) GetObject(ctx context.Context, bucket, object string, sta
 }
 
 func (z *erasureZones) GetObjectInfo(ctx context.Context, bucket, object string, opts ObjectOptions) (objInfo ObjectInfo, err error) {
+	object = encodeDirObject(object)
 	for _, zone := range z.zones {
 		objInfo, err = zone.GetObjectInfo(ctx, bucket, object, opts)
 		if err != nil {
@@ -503,6 +508,7 @@ func (z *erasureZones) GetObjectInfo(ctx context.Context, bucket, object string,
 		}
 		return objInfo, nil
 	}
+	object = decodeDirObject(object)
 	if opts.VersionID != "" {
 		return objInfo, VersionNotFound{Bucket: bucket, Object: object, VersionID: opts.VersionID}
 	}
@@ -511,6 +517,8 @@ func (z *erasureZones) GetObjectInfo(ctx context.Context, bucket, object string,
 
 // PutObject - writes an object to least used erasure zone.
 func (z *erasureZones) PutObject(ctx context.Context, bucket string, object string, data *PutObjReader, opts ObjectOptions) (ObjectInfo, error) {
+	object = encodeDirObject(object)
+
 	if z.SingleZone() {
 		return z.zones[0].PutObject(ctx, bucket, object, data, opts)
 	}
@@ -525,6 +533,8 @@ func (z *erasureZones) PutObject(ctx context.Context, bucket string, object stri
 }
 
 func (z *erasureZones) DeleteObject(ctx context.Context, bucket string, object string, opts ObjectOptions) (objInfo ObjectInfo, err error) {
+	object = encodeDirObject(object)
+
 	if z.SingleZone() {
 		return z.zones[0].DeleteObject(ctx, bucket, object, opts)
 	}
@@ -545,6 +555,8 @@ func (z *erasureZones) DeleteObjects(ctx context.Context, bucket string, objects
 	dobjects := make([]DeletedObject, len(objects))
 	objSets := set.NewStringSet()
 	for i := range derrs {
+		objects[i].ObjectName = encodeDirObject(objects[i].ObjectName)
+
 		derrs[i] = checkDelObjArgs(ctx, bucket, objects[i].ObjectName)
 		objSets.Add(objects[i].ObjectName)
 	}
@@ -576,6 +588,9 @@ func (z *erasureZones) DeleteObjects(ctx context.Context, bucket string, objects
 }
 
 func (z *erasureZones) CopyObject(ctx context.Context, srcBucket, srcObject, dstBucket, dstObject string, srcInfo ObjectInfo, srcOpts, dstOpts ObjectOptions) (objInfo ObjectInfo, err error) {
+	srcObject = encodeDirObject(srcObject)
+	dstObject = encodeDirObject(dstObject)
+
 	cpSrcDstSame := isStringEqual(pathJoin(srcBucket, srcObject), pathJoin(dstBucket, dstObject))
 
 	zoneIdx, err := z.getZoneIdx(ctx, dstBucket, dstObject, dstOpts, srcInfo.Size)
@@ -935,7 +950,16 @@ func lexicallySortedEntryZone(zoneEntryChs [][]FileInfoCh, zoneEntries [][]FileI
 				zoneIndex = i
 				continue
 			}
-			if zoneEntries[i][j].Name < lentry.Name {
+			str1 := zoneEntries[i][j].Name
+			str2 := lentry.Name
+			if HasSuffix(str1, globalDirSuffix) {
+				str1 = strings.TrimSuffix(str1, globalDirSuffix) + slashSeparator
+			}
+			if HasSuffix(str2, globalDirSuffix) {
+				str2 = strings.TrimSuffix(str2, globalDirSuffix) + slashSeparator
+			}
+
+			if str1 < str2 {
 				lentry = zoneEntries[i][j]
 				zoneIndex = i
 			}
@@ -968,6 +992,10 @@ func lexicallySortedEntryZone(zoneEntryChs [][]FileInfoCh, zoneEntries [][]FileI
 		}
 	}
 
+	if HasSuffix(lentry.Name, globalDirSuffix) {
+		lentry.Name = strings.TrimSuffix(lentry.Name, globalDirSuffix) + slashSeparator
+	}
+
 	return lentry, lexicallySortedEntryCount, zoneIndex, isTruncated
 }
 
@@ -1013,7 +1041,16 @@ func lexicallySortedEntryZoneVersions(zoneEntryChs [][]FileInfoVersionsCh, zoneE
 				zoneIndex = i
 				continue
 			}
-			if zoneEntries[i][j].Name < lentry.Name {
+			str1 := zoneEntries[i][j].Name
+			str2 := lentry.Name
+			if HasSuffix(str1, globalDirSuffix) {
+				str1 = strings.TrimSuffix(str1, globalDirSuffix) + slashSeparator
+			}
+			if HasSuffix(str2, globalDirSuffix) {
+				str2 = strings.TrimSuffix(str2, globalDirSuffix) + slashSeparator
+			}
+
+			if str1 < str2 {
 				lentry = zoneEntries[i][j]
 				zoneIndex = i
 			}
@@ -1046,6 +1083,10 @@ func lexicallySortedEntryZoneVersions(zoneEntryChs [][]FileInfoVersionsCh, zoneE
 		}
 	}
 
+	if HasSuffix(lentry.Name, globalDirSuffix) {
+		lentry.Name = strings.TrimSuffix(lentry.Name, globalDirSuffix) + slashSeparator
+	}
+
 	return lentry, lexicallySortedEntryCount, zoneIndex, isTruncated
 }
 
@@ -1058,6 +1099,7 @@ func mergeZonesEntriesVersionsCh(zonesEntryChs [][]FileInfoVersionsCh, maxKeys i
 		zonesEntriesInfos = append(zonesEntriesInfos, make([]FileInfoVersions, len(entryChs)))
 		zonesEntriesValid = append(zonesEntriesValid, make([]bool, len(entryChs)))
 	}
+
 	for {
 		fi, quorumCount, zoneIndex, ok := lexicallySortedEntryZoneVersions(zonesEntryChs, zonesEntriesInfos, zonesEntriesValid)
 		if !ok {
@@ -1089,6 +1131,7 @@ func mergeZonesEntriesCh(zonesEntryChs [][]FileInfoCh, maxKeys int, zonesListTol
 		zonesEntriesInfos = append(zonesEntriesInfos, make([]FileInfo, len(entryChs)))
 		zonesEntriesValid = append(zonesEntriesValid, make([]bool, len(entryChs)))
 	}
+	var prevEntry string
 	for {
 		fi, quorumCount, zoneIndex, ok := lexicallySortedEntryZone(zonesEntryChs, zonesEntriesInfos, zonesEntriesValid)
 		if !ok {
@@ -1101,12 +1144,17 @@ func mergeZonesEntriesCh(zonesEntryChs [][]FileInfoCh, maxKeys int, zonesListTol
 			continue
 		}
 
+		if HasSuffix(fi.Name, slashSeparator) && fi.Name == prevEntry {
+			continue
+		}
+
 		entries.Files = append(entries.Files, fi)
 		i++
 		if i == maxKeys {
 			entries.IsTruncated = isTruncatedZones(zonesEntryChs, zonesEntriesInfos, zonesEntriesValid)
 			break
 		}
+		prevEntry = fi.Name
 	}
 	return entries
 }
@@ -1836,6 +1884,8 @@ func (z *erasureZones) HealObjects(ctx context.Context, bucket, prefix string, o
 }
 
 func (z *erasureZones) HealObject(ctx context.Context, bucket, object, versionID string, opts madmin.HealOpts) (madmin.HealResultItem, error) {
+	object = encodeDirObject(object)
+
 	lk := z.NewNSLock(ctx, bucket, object)
 	if bucket == minioMetaBucket {
 		// For .minio.sys bucket heals we should hold write locks.
@@ -1956,6 +2006,7 @@ func (z *erasureZones) Health(ctx context.Context, opts HealthOptions) HealthRes
 
 	parityDrives := globalStorageClass.GetParityForSC(storageclass.STANDARD)
 	diskCount := z.SetDriveCount()
+
 	if parityDrives == 0 {
 		parityDrives = getDefaultParityBlocks(diskCount)
 	}
@@ -2019,6 +2070,7 @@ func (z *erasureZones) Health(ctx context.Context, opts HealthOptions) HealthRes
 
 // PutObjectTags - replace or add tags to an existing object
 func (z *erasureZones) PutObjectTags(ctx context.Context, bucket, object string, tags string, opts ObjectOptions) error {
+	object = encodeDirObject(object)
 	if z.SingleZone() {
 		return z.zones[0].PutObjectTags(ctx, bucket, object, tags, opts)
 	}
@@ -2048,6 +2100,7 @@ func (z *erasureZones) PutObjectTags(ctx context.Context, bucket, object string,
 
 // DeleteObjectTags - delete object tags from an existing object
 func (z *erasureZones) DeleteObjectTags(ctx context.Context, bucket, object string, opts ObjectOptions) error {
+	object = encodeDirObject(object)
 	if z.SingleZone() {
 		return z.zones[0].DeleteObjectTags(ctx, bucket, object, opts)
 	}
@@ -2076,6 +2129,7 @@ func (z *erasureZones) DeleteObjectTags(ctx context.Context, bucket, object stri
 
 // GetObjectTags - get object tags from an existing object
 func (z *erasureZones) GetObjectTags(ctx context.Context, bucket, object string, opts ObjectOptions) (*tags.Tags, error) {
+	object = encodeDirObject(object)
 	if z.SingleZone() {
 		return z.zones[0].GetObjectTags(ctx, bucket, object, opts)
 	}

cmd/globals.go

@@ -63,6 +63,8 @@ const (
 	globalMinioModeErasure         = "mode-server-xl"
 	globalMinioModeDistErasure     = "mode-server-distributed-xl"
 	globalMinioModeGatewayPrefix   = "mode-gateway-"
+	globalDirSuffix                = "__XLDIR__"
+	globalDirSuffixWithSlash       = globalDirSuffix + slashSeparator
 
 	// Add new global values here.
 )

cmd/object-api-errors.go

@@ -22,12 +22,18 @@ import (
 	"fmt"
 	"io"
 	"path"
+	"strings"
 )
 
 // Converts underlying storage error. Convenience function written to
 // handle all cases where we have known types of errors returned by
 // underlying storage layer.
 func toObjectErr(err error, params ...string) error {
+	if len(params) > 1 {
+		if HasSuffix(params[1], globalDirSuffix) {
+			params[1] = strings.TrimSuffix(params[1], globalDirSuffix) + slashSeparator
+		}
+	}
 	switch err {
 	case errVolumeNotFound:
 		if len(params) >= 1 {

cmd/server_test.go

@@ -131,6 +131,7 @@ func TestServerSuite(t *testing.T) {
 		// Init and run test on ErasureSet backend.
 		{serverType: "ErasureSet", signer: signerV4},
 	}
+	globalCLIContext.StrictS3Compat = true
 	for i, testCase := range testCases {
 		t.Run(fmt.Sprintf("Test: %d, ServerType: %s", i+1, testCase.serverType), func(t *testing.T) {
 			runAllTests(testCase, &check{t, testCase.serverType})
@@ -262,20 +263,6 @@ func (s *TestSuiteCommon) TestObjectDir(c *check) {
 	// assert the http response status code.
 	c.Assert(response.StatusCode, http.StatusOK)
 
-	request, err = newTestSignedRequest(http.MethodPut, getPutObjectURL(s.endPoint, bucketName, "my-object-directory/"),
-		0, nil, s.accessKey, s.secretKey, s.signer)
-	c.Assert(err, nil)
-
-	helloReader := bytes.NewReader([]byte("Hello, World"))
-	request.ContentLength = helloReader.Size()
-	request.Body = ioutil.NopCloser(helloReader)
-
-	// execute the HTTP request.
-	response, err = s.client.Do(request)
-
-	c.Assert(err, nil)
-	verifyError(c, response, "XMinioInvalidObjectName", "Object name contains unsupported characters.", http.StatusBadRequest)
-
 	request, err = newTestSignedRequest(http.MethodHead, getHeadObjectURL(s.endPoint, bucketName, "my-object-directory/"),
 		0, nil, s.accessKey, s.secretKey, s.signer)
 	c.Assert(err, nil)

cmd/tree-walk.go

@@ -57,6 +57,9 @@ func filterMatchingPrefix(entries []string, prefixEntry string) []string {
 // isLeaf should be done in listDir()
 func delayIsLeafCheck(entries []string) bool {
 	for i, entry := range entries {
+		if HasSuffix(entry, globalDirSuffixWithSlash) {
+			return false
+		}
 		if i == len(entries)-1 {
 			break
 		}
@@ -96,7 +99,20 @@ func filterListEntries(bucket, prefixDir string, entries []string, prefixEntry s
 	entries = filterMatchingPrefix(entries, prefixEntry)
 
 	// Listing needs to be sorted.
-	sort.Strings(entries)
+	sort.Slice(entries, func(i, j int) bool {
+		if !HasSuffix(entries[i], globalDirSuffixWithSlash) && !HasSuffix(entries[j], globalDirSuffixWithSlash) {
+			return entries[i] < entries[j]
+		}
+		first := entries[i]
+		second := entries[j]
+		if HasSuffix(first, globalDirSuffixWithSlash) {
+			first = strings.TrimSuffix(first, globalDirSuffixWithSlash) + slashSeparator
+		}
+		if HasSuffix(second, globalDirSuffixWithSlash) {
+			second = strings.TrimSuffix(second, globalDirSuffixWithSlash) + slashSeparator
+		}
+		return first < second
+	})
 
 	// Can isLeaf() check be delayed till when it has to be sent down the
 	// TreeWalkResult channel?
@@ -114,8 +130,23 @@ func filterListEntries(bucket, prefixDir string, entries []string, prefixEntry s
 
 	// Sort again after removing trailing "/" for objects as the previous sort
 	// does not hold good anymore.
-	sort.Strings(entries)
-
+	sort.Slice(entries, func(i, j int) bool {
+		if !HasSuffix(entries[i], globalDirSuffix) && !HasSuffix(entries[j], globalDirSuffix) {
+			return entries[i] < entries[j]
+		}
+		first := entries[i]
+		second := entries[j]
+		if HasSuffix(first, globalDirSuffix) {
+			first = strings.TrimSuffix(first, globalDirSuffix) + slashSeparator
+		}
+		if HasSuffix(second, globalDirSuffix) {
+			second = strings.TrimSuffix(second, globalDirSuffix) + slashSeparator
+		}
+		if first == second {
+			return HasSuffix(entries[i], globalDirSuffix)
+		}
+		return first < second
+	})
 	return entries, false
 }
 
@@ -169,10 +200,10 @@ func doTreeWalk(ctx context.Context, bucket, prefixDir, entryPrefixMatch, marker
 				entry = strings.TrimSuffix(entry, slashSeparator)
 			}
 		} else {
-			leaf = !strings.HasSuffix(entry, slashSeparator)
+			leaf = !HasSuffix(entry, slashSeparator)
 		}
 
-		if strings.HasSuffix(entry, slashSeparator) {
+		if HasSuffix(entry, slashSeparator) {
 			leafDir = isLeafDir(bucket, pathJoin(prefixDir, entry))
 		}
 

cmd/utils.go

@@ -737,3 +737,20 @@ func (t *timedValue) Invalidate() {
 	t.value = nil
 	t.mu.Unlock()
 }
+
+// On MinIO a directory object is stored as a regular object with "__XLDIR__" suffix.
+// For ex. "prefix/" is stored as "prefix__XLDIR__"
+func encodeDirObject(object string) string {
+	if HasSuffix(object, slashSeparator) {
+		return strings.TrimSuffix(object, slashSeparator) + globalDirSuffix
+	}
+	return object
+}
+
+// Reverse process of encodeDirObject()
+func decodeDirObject(object string) string {
+	if HasSuffix(object, globalDirSuffix) {
+		return strings.TrimSuffix(object, globalDirSuffix) + slashSeparator
+	}
+	return object
+}