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615 lines
19 KiB
615 lines
19 KiB
/*
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* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"bytes"
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"errors"
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"fmt"
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"strings"
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"time"
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"github.com/google/uuid"
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"github.com/minio/minio/cmd/logger"
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)
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var (
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// XL header specifies the format
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xlHeader = [4]byte{'X', 'L', '2', ' '}
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// XLv2 version 1
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xlVersionV1 = [4]byte{'1', ' ', ' ', ' '}
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)
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func checkXL2V1(buf []byte) error {
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if len(buf) <= 8 {
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return fmt.Errorf("xlMeta: no data")
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}
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if !bytes.Equal(buf[:4], xlHeader[:]) {
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return fmt.Errorf("xlMeta: unknown XLv2 header, expected %v, got %v", xlHeader[:4], buf[:4])
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}
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if !bytes.Equal(buf[4:8], xlVersionV1[:]) {
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return fmt.Errorf("xlMeta: unknown XLv2 version, expected %v, got %v", xlVersionV1[:4], buf[4:8])
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}
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return nil
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}
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func isXL2V1Format(buf []byte) bool {
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return checkXL2V1(buf) == nil
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}
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// The []journal contains all the different versions of the object.
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//
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// This array can have 3 kinds of objects:
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//
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// ``object``: If the object is uploaded the usual way: putobject, multipart-put, copyobject
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//
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// ``delete``: This is the delete-marker
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//
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// ``legacyObject``: This is the legacy object in xlV1 format, preserved until its overwritten
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//
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// The most recently updated element in the array is considered the latest version.
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// Backend directory tree structure:
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// disk1/
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// └── bucket
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// └── object
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// ├── a192c1d5-9bd5-41fd-9a90-ab10e165398d
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// │ └── part.1
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// ├── c06e0436-f813-447e-ae5e-f2564df9dfd4
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// │ └── part.1
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// ├── df433928-2dcf-47b1-a786-43efa0f6b424
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// │ └── part.1
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// ├── legacy
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// │ └── part.1
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// └── xl.meta
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//go:generate msgp -file=$GOFILE -unexported
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// VersionType defines the type of journal type of the current entry.
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type VersionType uint8
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// List of different types of journal type
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const (
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invalidVersionType VersionType = 0
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ObjectType VersionType = 1
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DeleteType VersionType = 2
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LegacyType VersionType = 3
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lastVersionType VersionType = 4
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)
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func (e VersionType) valid() bool {
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return e > invalidVersionType && e < lastVersionType
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}
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// ErasureAlgo defines common type of different erasure algorithms
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type ErasureAlgo uint8
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// List of currently supported erasure coding algorithms
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const (
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invalidErasureAlgo ErasureAlgo = 0
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ReedSolomon ErasureAlgo = 1
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lastErasureAlgo ErasureAlgo = 2
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)
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func (e ErasureAlgo) valid() bool {
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return e > invalidErasureAlgo && e < lastErasureAlgo
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}
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func (e ErasureAlgo) String() string {
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switch e {
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case ReedSolomon:
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return "reedsolomon"
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}
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return ""
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}
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// ChecksumAlgo defines common type of different checksum algorithms
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type ChecksumAlgo uint8
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// List of currently supported checksum algorithms
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const (
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invalidChecksumAlgo ChecksumAlgo = 0
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HighwayHash ChecksumAlgo = 1
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lastChecksumAlgo ChecksumAlgo = 2
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)
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func (e ChecksumAlgo) valid() bool {
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return e > invalidChecksumAlgo && e < lastChecksumAlgo
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}
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// xlMetaV2DeleteMarker defines the data struct for the delete marker journal type
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type xlMetaV2DeleteMarker struct {
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VersionID [16]byte `json:"ID" msg:"ID"` // Version ID for delete marker
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ModTime int64 `json:"MTime" msg:"MTime"` // Object delete marker modified time
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}
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// xlMetaV2Object defines the data struct for object journal type
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type xlMetaV2Object struct {
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VersionID [16]byte `json:"ID" msg:"ID"` // Version ID
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DataDir [16]byte `json:"DDir" msg:"DDir"` // Data dir ID
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ErasureAlgorithm ErasureAlgo `json:"EcAlgo" msg:"EcAlgo"` // Erasure coding algorithm
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ErasureM int `json:"EcM" msg:"EcM"` // Erasure data blocks
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ErasureN int `json:"EcN" msg:"EcN"` // Erasure parity blocks
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ErasureBlockSize int64 `json:"EcBSize" msg:"EcBSize"` // Erasure block size
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ErasureIndex int `json:"EcIndex" msg:"EcIndex"` // Erasure disk index
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ErasureDist []uint8 `json:"EcDist" msg:"EcDist"` // Erasure distribution
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BitrotChecksumAlgo ChecksumAlgo `json:"CSumAlgo" msg:"CSumAlgo"` // Bitrot checksum algo
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PartNumbers []int `json:"PartNums" msg:"PartNums"` // Part Numbers
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PartETags []string `json:"PartETags" msg:"PartETags"` // Part ETags
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PartSizes []int64 `json:"PartSizes" msg:"PartSizes"` // Part Sizes
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PartActualSizes []int64 `json:"PartASizes,omitempty" msg:"PartASizes,omitempty"` // Part ActualSizes (compression)
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StatSize int64 `json:"Size" msg:"Size"` // Object version size
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StatModTime int64 `json:"MTime" msg:"MTime"` // Object version modified time
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MetaSys map[string][]byte `json:"MetaSys,omitempty" msg:"MetaSys,omitempty"` // Object version internal metadata
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MetaUser map[string]string `json:"MetaUsr,omitempty" msg:"MetaUsr,omitempty"` // Object version metadata set by user
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}
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// xlMetaV2Version describes the jouranal entry, Type defines
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// the current journal entry type other types might be nil based
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// on what Type field carries, it is imperative for the caller
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// to verify which journal type first before accessing rest of the fields.
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type xlMetaV2Version struct {
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Type VersionType `json:"Type" msg:"Type"`
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ObjectV1 *xlMetaV1Object `json:"V1Obj,omitempty" msg:"V1Obj,omitempty"`
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ObjectV2 *xlMetaV2Object `json:"V2Obj,omitempty" msg:"V2Obj,omitempty"`
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DeleteMarker *xlMetaV2DeleteMarker `json:"DelObj,omitempty" msg:"DelObj,omitempty"`
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}
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// Valid xl meta xlMetaV2Version is valid
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func (j xlMetaV2Version) Valid() bool {
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switch j.Type {
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case LegacyType:
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return j.ObjectV1 != nil &&
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j.ObjectV1.valid()
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case ObjectType:
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return j.ObjectV2 != nil &&
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j.ObjectV2.ErasureAlgorithm.valid() &&
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j.ObjectV2.BitrotChecksumAlgo.valid() &&
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isXLMetaErasureInfoValid(j.ObjectV2.ErasureM, j.ObjectV2.ErasureN) &&
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j.ObjectV2.StatModTime > 0
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case DeleteType:
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return j.DeleteMarker != nil &&
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j.DeleteMarker.ModTime > 0
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}
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return false
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}
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// xlMetaV2 - object meta structure defines the format and list of
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// the journals for the object.
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type xlMetaV2 struct {
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Versions []xlMetaV2Version `json:"Versions" msg:"Versions"`
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}
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// AddLegacy adds a legacy version, is only called when no prior
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// versions exist, safe to use it by only one function in xl-storage(RenameData)
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func (z *xlMetaV2) AddLegacy(m *xlMetaV1Object) error {
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if !m.valid() {
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return errFileCorrupt
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}
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m.VersionID = nullVersionID
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m.DataDir = legacyDataDir
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z.Versions = []xlMetaV2Version{
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{
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Type: LegacyType,
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ObjectV1: m,
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},
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}
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return nil
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}
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// Load unmarshal and load the entire message pack.
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func (z *xlMetaV2) Load(buf []byte) error {
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if err := checkXL2V1(buf); err != nil {
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return err
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}
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_, err := z.UnmarshalMsg(buf[8:])
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return err
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}
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// AddVersion adds a new version
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func (z *xlMetaV2) AddVersion(fi FileInfo) error {
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if fi.Deleted {
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uv, err := uuid.Parse(fi.VersionID)
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if err != nil {
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return err
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}
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v := xlMetaV2Version{
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Type: DeleteType,
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DeleteMarker: &xlMetaV2DeleteMarker{
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VersionID: uv,
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ModTime: fi.ModTime.UnixNano(),
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},
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}
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if !v.Valid() {
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return errors.New("internal error: invalid version entry generated")
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}
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z.Versions = append(z.Versions, v)
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return nil
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}
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if fi.VersionID == "" {
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// this means versioning is not yet
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// enabled i.e all versions are basically
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// default value i.e "null"
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fi.VersionID = nullVersionID
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}
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var uv uuid.UUID
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var err error
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if fi.VersionID != "" && fi.VersionID != nullVersionID {
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uv, err = uuid.Parse(fi.VersionID)
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if err != nil {
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return err
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}
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}
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dd, err := uuid.Parse(fi.DataDir)
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if err != nil {
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return err
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}
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ventry := xlMetaV2Version{
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Type: ObjectType,
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ObjectV2: &xlMetaV2Object{
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VersionID: uv,
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DataDir: dd,
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StatSize: fi.Size,
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StatModTime: fi.ModTime.UnixNano(),
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ErasureAlgorithm: ReedSolomon,
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ErasureM: fi.Erasure.DataBlocks,
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ErasureN: fi.Erasure.ParityBlocks,
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ErasureBlockSize: fi.Erasure.BlockSize,
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ErasureIndex: fi.Erasure.Index,
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BitrotChecksumAlgo: HighwayHash,
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ErasureDist: make([]uint8, len(fi.Erasure.Distribution)),
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PartNumbers: make([]int, len(fi.Parts)),
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PartETags: make([]string, len(fi.Parts)),
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PartSizes: make([]int64, len(fi.Parts)),
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PartActualSizes: make([]int64, len(fi.Parts)),
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MetaSys: make(map[string][]byte),
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MetaUser: make(map[string]string),
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},
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}
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for i := range fi.Erasure.Distribution {
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ventry.ObjectV2.ErasureDist[i] = uint8(fi.Erasure.Distribution[i])
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}
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for i := range fi.Parts {
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ventry.ObjectV2.PartSizes[i] = fi.Parts[i].Size
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if fi.Parts[i].ETag != "" {
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ventry.ObjectV2.PartETags[i] = fi.Parts[i].ETag
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}
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ventry.ObjectV2.PartNumbers[i] = fi.Parts[i].Number
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ventry.ObjectV2.PartActualSizes[i] = fi.Parts[i].ActualSize
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}
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for k, v := range fi.Metadata {
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if strings.HasPrefix(strings.ToLower(k), ReservedMetadataPrefixLower) {
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ventry.ObjectV2.MetaSys[k] = []byte(v)
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} else {
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ventry.ObjectV2.MetaUser[k] = v
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}
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}
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if !ventry.Valid() {
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return errors.New("internal error: invalid version entry generated")
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}
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for i, version := range z.Versions {
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if !version.Valid() {
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return errFileCorrupt
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}
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switch version.Type {
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case LegacyType:
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// This would convert legacy type into new ObjectType
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// this means that we are basically purging the `null`
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// version of the object.
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if version.ObjectV1.VersionID == fi.VersionID {
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z.Versions[i] = ventry
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return nil
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}
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case ObjectType:
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if bytes.Equal(version.ObjectV2.VersionID[:], uv[:]) {
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z.Versions[i] = ventry
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return nil
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}
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case DeleteType:
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// Allowing delete marker to replaced with an proper
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// object data type as well, this is not S3 complaint
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// behavior but kept here for future flexibility.
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if bytes.Equal(version.DeleteMarker.VersionID[:], uv[:]) {
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z.Versions[i] = ventry
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return nil
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}
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}
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}
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z.Versions = append(z.Versions, ventry)
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return nil
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}
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func newXLMetaV2(fi FileInfo) (xlMetaV2, error) {
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xlMeta := xlMetaV2{}
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return xlMeta, xlMeta.AddVersion(fi)
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}
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func (j xlMetaV2DeleteMarker) ToFileInfo(volume, path string) (FileInfo, error) {
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fi := FileInfo{
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Volume: volume,
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Name: path,
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ModTime: time.Unix(0, j.ModTime).UTC(),
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VersionID: uuid.UUID(j.VersionID).String(),
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Deleted: true,
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}
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return fi, nil
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}
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func (j xlMetaV2Object) ToFileInfo(volume, path string) (FileInfo, error) {
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versionID := ""
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var uv uuid.UUID
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// check if the version is not "null"
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if !bytes.Equal(j.VersionID[:], uv[:]) {
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versionID = uuid.UUID(j.VersionID).String()
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}
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fi := FileInfo{
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Volume: volume,
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Name: path,
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Size: j.StatSize,
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ModTime: time.Unix(0, j.StatModTime).UTC(),
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VersionID: versionID,
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}
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fi.Parts = make([]ObjectPartInfo, len(j.PartNumbers))
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for i := range fi.Parts {
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fi.Parts[i].Number = int(j.PartNumbers[i])
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fi.Parts[i].Size = int64(j.PartSizes[i])
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fi.Parts[i].ETag = j.PartETags[i]
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fi.Parts[i].ActualSize = int64(j.PartActualSizes[i])
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}
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fi.Erasure.Checksums = make([]ChecksumInfo, len(j.PartSizes))
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for i := range fi.Parts {
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fi.Erasure.Checksums[i].PartNumber = fi.Parts[i].Number
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switch j.BitrotChecksumAlgo {
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case HighwayHash:
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fi.Erasure.Checksums[i].Algorithm = HighwayHash256S
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fi.Erasure.Checksums[i].Hash = []byte{}
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default:
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return FileInfo{}, fmt.Errorf("unknown BitrotChecksumAlgo: %v", j.BitrotChecksumAlgo)
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}
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}
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fi.Metadata = make(map[string]string, len(j.MetaUser)+len(j.MetaSys))
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for k, v := range j.MetaUser {
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fi.Metadata[k] = v
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}
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for k, v := range j.MetaSys {
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if strings.HasPrefix(strings.ToLower(k), ReservedMetadataPrefixLower) {
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fi.Metadata[k] = string(v)
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}
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}
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fi.Erasure.Algorithm = j.ErasureAlgorithm.String()
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fi.Erasure.Index = j.ErasureIndex
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fi.Erasure.BlockSize = j.ErasureBlockSize
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fi.Erasure.DataBlocks = j.ErasureM
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fi.Erasure.ParityBlocks = j.ErasureN
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fi.Erasure.Distribution = make([]int, len(j.ErasureDist))
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for i := range j.ErasureDist {
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fi.Erasure.Distribution[i] = int(j.ErasureDist[i])
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}
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fi.DataDir = uuid.UUID(j.DataDir).String()
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return fi, nil
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}
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// DeleteVersion deletes the version specified by version id.
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// returns to the caller which dataDir to delete, also
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// indicates if this is the last version.
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func (z *xlMetaV2) DeleteVersion(fi FileInfo) (string, bool, error) {
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// This is a situation where versionId is explicitly
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// specified as "null", as we do not save "null"
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// string it is considered empty. But empty also
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// means the version which matches will be purged.
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if fi.VersionID == nullVersionID {
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fi.VersionID = ""
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}
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var uv uuid.UUID
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if fi.VersionID != "" {
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uv, _ = uuid.Parse(fi.VersionID)
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}
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for i, version := range z.Versions {
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if !version.Valid() {
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return "", false, errFileCorrupt
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}
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switch version.Type {
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case LegacyType:
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if version.ObjectV1.VersionID == fi.VersionID {
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z.Versions = append(z.Versions[:i], z.Versions[i+1:]...)
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return version.ObjectV1.DataDir, len(z.Versions) == 0, nil
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}
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case ObjectType:
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if bytes.Equal(version.ObjectV2.VersionID[:], uv[:]) {
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z.Versions = append(z.Versions[:i], z.Versions[i+1:]...)
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return uuid.UUID(version.ObjectV2.DataDir).String(), len(z.Versions) == 0, nil
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}
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case DeleteType:
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if bytes.Equal(version.DeleteMarker.VersionID[:], uv[:]) {
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z.Versions = append(z.Versions[:i], z.Versions[i+1:]...)
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return "", len(z.Versions) == 0, nil
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}
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}
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}
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return "", false, errFileVersionNotFound
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}
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// TotalSize returns the total size of all versions.
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func (z xlMetaV2) TotalSize() int64 {
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var total int64
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for i := range z.Versions {
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switch z.Versions[i].Type {
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case ObjectType:
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total += z.Versions[i].ObjectV2.StatSize
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case LegacyType:
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total += z.Versions[i].ObjectV1.Stat.Size
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}
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}
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return total
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}
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// ListVersions lists current versions, and current deleted
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// versions returns error for unexpected entries.
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func (z xlMetaV2) ListVersions(volume, path string) (versions []FileInfo, deleted []FileInfo, modTime time.Time, err error) {
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var latestModTime time.Time
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var latestVersionID string
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for _, version := range z.Versions {
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if !version.Valid() {
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return nil, nil, latestModTime, errFileCorrupt
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}
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var fi FileInfo
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switch version.Type {
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case ObjectType:
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fi, err = version.ObjectV2.ToFileInfo(volume, path)
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case DeleteType:
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fi, err = version.DeleteMarker.ToFileInfo(volume, path)
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case LegacyType:
|
|
fi, err = version.ObjectV1.ToFileInfo(volume, path)
|
|
default:
|
|
continue
|
|
}
|
|
if err != nil {
|
|
return nil, nil, latestModTime, err
|
|
}
|
|
if fi.ModTime.After(latestModTime) {
|
|
latestModTime = fi.ModTime
|
|
latestVersionID = fi.VersionID
|
|
}
|
|
switch version.Type {
|
|
case LegacyType:
|
|
fallthrough
|
|
case ObjectType:
|
|
versions = append(versions, fi)
|
|
case DeleteType:
|
|
deleted = append(deleted, fi)
|
|
|
|
}
|
|
}
|
|
|
|
// Since we can never have duplicate versions the versionID
|
|
// if it matches first with deleted markers then we are sure
|
|
// that actual versions wouldn't be latest, so we can return
|
|
// early if we find the version in delete markers.
|
|
for i := range deleted {
|
|
if deleted[i].VersionID == latestVersionID {
|
|
deleted[i].IsLatest = true
|
|
return versions, deleted, latestModTime, nil
|
|
}
|
|
}
|
|
// We didn't find the version in delete markers so latest version
|
|
// is indeed one of the actual version of the object with data.
|
|
for i := range versions {
|
|
if versions[i].VersionID != latestVersionID {
|
|
continue
|
|
}
|
|
versions[i].IsLatest = true
|
|
break
|
|
}
|
|
return versions, deleted, latestModTime, nil
|
|
}
|
|
|
|
// ToFileInfo converts xlMetaV2 into a common FileInfo datastructure
|
|
// for consumption across callers.
|
|
func (z xlMetaV2) ToFileInfo(volume, path, versionID string) (FileInfo, error) {
|
|
var uv uuid.UUID
|
|
if versionID != "" {
|
|
uv, _ = uuid.Parse(versionID)
|
|
}
|
|
|
|
if versionID == "" {
|
|
var latestModTime time.Time
|
|
var latestIndex int
|
|
for i, version := range z.Versions {
|
|
if !version.Valid() {
|
|
logger.LogIf(GlobalContext, fmt.Errorf("invalid version detected %#v", version))
|
|
return FileInfo{}, errFileNotFound
|
|
}
|
|
var modTime time.Time
|
|
switch version.Type {
|
|
case ObjectType:
|
|
modTime = time.Unix(0, version.ObjectV2.StatModTime)
|
|
case DeleteType:
|
|
modTime = time.Unix(0, version.DeleteMarker.ModTime)
|
|
case LegacyType:
|
|
modTime = version.ObjectV1.Stat.ModTime
|
|
default:
|
|
continue
|
|
}
|
|
if modTime.After(latestModTime) {
|
|
latestModTime = modTime
|
|
latestIndex = i
|
|
}
|
|
}
|
|
if len(z.Versions) >= 1 {
|
|
switch z.Versions[latestIndex].Type {
|
|
case ObjectType:
|
|
return z.Versions[latestIndex].ObjectV2.ToFileInfo(volume, path)
|
|
case DeleteType:
|
|
return z.Versions[latestIndex].DeleteMarker.ToFileInfo(volume, path)
|
|
case LegacyType:
|
|
return z.Versions[latestIndex].ObjectV1.ToFileInfo(volume, path)
|
|
}
|
|
}
|
|
return FileInfo{}, errFileNotFound
|
|
}
|
|
|
|
for _, version := range z.Versions {
|
|
if !version.Valid() {
|
|
logger.LogIf(GlobalContext, fmt.Errorf("invalid version detected %#v", version))
|
|
if versionID == "" {
|
|
return FileInfo{}, errFileNotFound
|
|
}
|
|
return FileInfo{}, errFileVersionNotFound
|
|
}
|
|
switch version.Type {
|
|
case ObjectType:
|
|
if bytes.Equal(version.ObjectV2.VersionID[:], uv[:]) {
|
|
return version.ObjectV2.ToFileInfo(volume, path)
|
|
}
|
|
case LegacyType:
|
|
if version.ObjectV1.VersionID == versionID {
|
|
return version.ObjectV1.ToFileInfo(volume, path)
|
|
}
|
|
case DeleteType:
|
|
if bytes.Equal(version.DeleteMarker.VersionID[:], uv[:]) {
|
|
return version.DeleteMarker.ToFileInfo(volume, path)
|
|
}
|
|
default:
|
|
logger.LogIf(GlobalContext, fmt.Errorf("unknown version type: %v", version.Type))
|
|
if versionID == "" {
|
|
return FileInfo{}, errFileNotFound
|
|
}
|
|
|
|
return FileInfo{}, errFileVersionNotFound
|
|
}
|
|
}
|
|
|
|
if versionID == "" {
|
|
return FileInfo{}, errFileNotFound
|
|
}
|
|
|
|
return FileInfo{}, errFileVersionNotFound
|
|
}
|
|
|