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Remove inline data hack (#12946)

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move the code down to the storage layer,
this logic decouples the inline data from the 
size parameter making it flexible and future
proof.
This commit is contained in:
Klaus Post 2021-08-13 17:25:54 +02:00 committed by GitHub
parent f31a00de01
commit 24722ddd02
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 27 additions and 27 deletions
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20
cmd/erasure-object.go
View File

@ -256,26 +256,6 @@ func (er erasureObjects) getObjectWithFileInfo(ctx context.Context, bucket, obje
return toObjectErr(err, bucket, object)
}
// This hack is needed to avoid a bug found when overwriting
// the inline data object with a un-inlined version, for the
// time being we need this as we have released inline-data
// version already and this bug is already present in newer
// releases.
//
// This mainly happens with objects < smallFileThreshold when
// they are overwritten with un-inlined objects >= smallFileThreshold,
// due to a bug in RenameData() the fi.Data is not niled leading to
// GetObject thinking that fi.Data is valid while fi.Size has
// changed already.
if fi.InlineData() {
shardFileSize := erasure.ShardFileSize(fi.Size)
if shardFileSize >= 0 && shardFileSize >= smallFileThreshold {
for i := range metaArr {
metaArr[i].Data = nil
}
}
}
var healOnce sync.Once
// once we have obtained a common FileInfo i.e latest, we should stick

5
cmd/storage-datatypes.go
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@ -190,7 +190,10 @@ func (fi FileInfo) InlineData() bool {
}
// SetInlineData marks object (version) as inline.
func (fi FileInfo) SetInlineData() {
func (fi *FileInfo) SetInlineData() {
if fi.Metadata == nil {
fi.Metadata = make(map[string]string, 1)
}
fi.Metadata[ReservedMetadataPrefixLower+"inline-data"] = "true"
}

2
cmd/xl-storage-format-v2.go
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@ -253,7 +253,7 @@ type xlMetaV2 struct {
//msgp:ignore xlMetaInlineData
type xlMetaInlineData []byte
// xlMetaInlineDataVer indicates the vesrion of the inline data structure.
// xlMetaInlineDataVer indicates the version of the inline data structure.
const xlMetaInlineDataVer = 1
// versionOK returns whether the version is ok.

27
cmd/xl-storage.go
View File

@ -1130,13 +1130,30 @@ func (s *xlStorage) ReadVersion(ctx context.Context, volume, path, versionID str
if readData {
if len(fi.Data) > 0 || fi.Size == 0 {
if len(fi.Data) > 0 {
if !fi.InlineData() {
fi.SetInlineData()
}
}
if fi.InlineData() {
// If written with header we are fine.
return fi, nil
}
if fi.Size == 0 || !(fi.VersionID != "" && fi.VersionID != nullVersionID) {
// If versioned we have no conflicts.
fi.SetInlineData()
return fi, nil
}
// For overwritten objects without header we might have a conflict with
// data written later.
// Check the data path if there is a part with data.
partPath := fmt.Sprintf("part.%d", fi.Parts[0].Number)
dataPath := pathJoin(path, fi.DataDir, partPath)
_, err = s.StatInfoFile(ctx, volume, dataPath)
if err != nil {
// Set the inline header, our inlined data is fine.
fi.SetInlineData()
return fi, nil
}
// Data exists on disk, remove the version from metadata.
fi.Data = nil
}
// Reading data for small objects when
// - object has not yet transitioned