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fix: use meta.Erasure.Index for GetObject() to reconstruct object (#10764)

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Krishna Srinivas 2020-10-26 16:19:42 -07:00 committed by GitHub
parent 46275c6547
commit c49a80db41
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 32 additions and 3 deletions
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24
cmd/erasure-metadata-utils.go
View File

@ -153,6 +153,30 @@ func readVersionFromDisks(ctx context.Context, disks []StorageAPI, bucket, objec
return metadataArray, g.Wait()
}
// Return disks ordered by the meta.Erasure.Index information.
func shuffleDisksByIndex(disks []StorageAPI, metaArr []FileInfo) (shuffledDisks []StorageAPI) {
shuffledDisks = make([]StorageAPI, len(disks))
for i, meta := range metaArr {
if disks[i] == nil {
continue
}
shuffledDisks[meta.Erasure.Index-1] = disks[i]
}
return shuffledDisks
}
// Return FileInfo slice ordered by the meta.Erasure.Index information.
func shufflePartsMetadataByIndex(disks []StorageAPI, metaArr []FileInfo) []FileInfo {
newMetaArr := make([]FileInfo, len(disks))
for i, meta := range metaArr {
if disks[i] == nil {
continue
}
newMetaArr[meta.Erasure.Index-1] = metaArr[i]
}
return newMetaArr
}
// Return shuffled partsMetadata depending on distribution.
func shufflePartsMetadata(partsMetadata []FileInfo, distribution []int) (shuffledPartsMetadata []FileInfo) {
if distribution == nil {

3
cmd/erasure-metadata.go
View File

@ -91,7 +91,8 @@ func (fi FileInfo) IsValid() bool {
dataBlocks := fi.Erasure.DataBlocks
parityBlocks := fi.Erasure.ParityBlocks
return ((dataBlocks >= parityBlocks) &&
(dataBlocks != 0) && (parityBlocks != 0))
(dataBlocks != 0) && (parityBlocks != 0) &&
(fi.Erasure.Index > 0 && fi.Erasure.Distribution != nil))
}
// ToObjectInfo - Converts metadata to object info.

3
cmd/erasure-metadata_test.go
View File

@ -47,6 +47,7 @@ func TestAddObjectPart(t *testing.T) {
// Setup.
fi := newFileInfo("test-object", 8, 8)
fi.Erasure.Index = 1
if !fi.IsValid() {
t.Fatalf("unable to get xl meta")
}
@ -80,6 +81,7 @@ func TestObjectPartIndex(t *testing.T) {
// Setup.
fi := newFileInfo("test-object", 8, 8)
fi.Erasure.Index = 1
if !fi.IsValid() {
t.Fatalf("unable to get xl meta")
}
@ -108,6 +110,7 @@ func TestObjectPartIndex(t *testing.T) {
func TestObjectToPartOffset(t *testing.T) {
// Setup.
fi := newFileInfo("test-object", 8, 8)
fi.Erasure.Index = 1
if !fi.IsValid() {
t.Fatalf("unable to get xl meta")
}

5
cmd/erasure-object.go
View File

@ -215,11 +215,12 @@ func (er erasureObjects) GetObject(ctx context.Context, bucket, object string, s
}
func (er erasureObjects) getObjectWithFileInfo(ctx context.Context, bucket, object string, startOffset int64, length int64, writer io.Writer, etag string, opts ObjectOptions, fi FileInfo, metaArr []FileInfo, onlineDisks []StorageAPI) error {
tmpDisks := onlineDisks
// Reorder online disks based on erasure distribution order.
onlineDisks = shuffleDisks(onlineDisks, fi.Erasure.Distribution)
onlineDisks = shuffleDisksByIndex(tmpDisks, metaArr)
// Reorder parts metadata based on erasure distribution order.
metaArr = shufflePartsMetadata(metaArr, fi.Erasure.Distribution)
metaArr = shufflePartsMetadataByIndex(tmpDisks, metaArr)
// For negative length read everything.
if length < 0 {