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minio/cmd/xl-storage-format-v2.go

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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"bytes"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io"
"sort"
"strconv"
"strings"
"sync"
"time"
"github.com/cespare/xxhash/v2"
"github.com/google/uuid"
jsoniter "github.com/json-iterator/go"
"github.com/minio/minio/internal/bucket/lifecycle"
"github.com/minio/minio/internal/bucket/replication"
xhttp "github.com/minio/minio/internal/http"
"github.com/minio/minio/internal/logger"
"github.com/minio/pkg/v2/env"
"github.com/tinylib/msgp/msgp"
)
// Reject creating new versions when a single object is cross maxObjectVersions
var maxObjectVersions = 10000
func init() {
v := env.Get("_MINIO_OBJECT_MAX_VERSIONS", "")
if v != "" {
maxv, err := strconv.Atoi(v)
if err != nil {
logger.Info("invalid _MINIO_OBJECT_MAX_VERSIONS value: %s, defaulting to '10000'", v)
maxObjectVersions = 10000
} else {
if maxv < 10 {
logger.Info("invalid _MINIO_OBJECT_MAX_VERSIONS value: %s, minimum allowed is '10' defaulting to '10000'", v)
maxObjectVersions = 10000
} else {
maxObjectVersions = maxv
}
}
}
}
var (
// XL header specifies the format
xlHeader = [4]byte{'X', 'L', '2', ' '}
// Current version being written.
xlVersionCurrent [4]byte
)
//go:generate msgp -file=$GOFILE -unexported
//go:generate stringer -type VersionType,ErasureAlgo -output=xl-storage-format-v2_string.go $GOFILE
const (
// Breaking changes.
// Newer versions cannot be read by older software.
// This will prevent downgrades to incompatible versions.
xlVersionMajor = 1
// Non breaking changes.
// Bumping this is informational, but should be done
// if any change is made to the data stored, bumping this
// will allow to detect the exact version later.
xlVersionMinor = 3
)
func init() {
binary.LittleEndian.PutUint16(xlVersionCurrent[0:2], xlVersionMajor)
binary.LittleEndian.PutUint16(xlVersionCurrent[2:4], xlVersionMinor)
}
// The []journal contains all the different versions of the object.
//
// This array can have 3 kinds of objects:
//
// ``object``: If the object is uploaded the usual way: putobject, multipart-put, copyobject
//
// ``delete``: This is the delete-marker
//
// ``legacyObject``: This is the legacy object in xlV1 format, preserved until its overwritten
//
// The most recently updated element in the array is considered the latest version.
// In addition to these we have a special kind called free-version. This is represented
// using a delete-marker and MetaSys entries. It's used to track tiered content of a
// deleted/overwritten version. This version is visible _only_to the scanner routine, for subsequent deletion.
// This kind of tracking is necessary since a version's tiered content is deleted asynchronously.
// Backend directory tree structure:
// disk1/
// └── bucket
// └── object
// ├── a192c1d5-9bd5-41fd-9a90-ab10e165398d
// │ └── part.1
// ├── c06e0436-f813-447e-ae5e-f2564df9dfd4
// │ └── part.1
// ├── df433928-2dcf-47b1-a786-43efa0f6b424
// │ └── part.1
// ├── legacy
// │ └── part.1
// └── xl.meta
// VersionType defines the type of journal type of the current entry.
type VersionType uint8
// List of different types of journal type
const (
invalidVersionType VersionType = 0
ObjectType VersionType = 1
DeleteType VersionType = 2
LegacyType VersionType = 3
lastVersionType VersionType = 4
)
func (e VersionType) valid() bool {
return e > invalidVersionType && e < lastVersionType
}
// ErasureAlgo defines common type of different erasure algorithms
type ErasureAlgo uint8
// List of currently supported erasure coding algorithms
const (
invalidErasureAlgo ErasureAlgo = 0
ReedSolomon ErasureAlgo = 1
lastErasureAlgo ErasureAlgo = 2
)
func (e ErasureAlgo) valid() bool {
return e > invalidErasureAlgo && e < lastErasureAlgo
}
// ChecksumAlgo defines common type of different checksum algorithms
type ChecksumAlgo uint8
// List of currently supported checksum algorithms
const (
invalidChecksumAlgo ChecksumAlgo = 0
HighwayHash ChecksumAlgo = 1
lastChecksumAlgo ChecksumAlgo = 2
)
func (e ChecksumAlgo) valid() bool {
return e > invalidChecksumAlgo && e < lastChecksumAlgo
}
// xlMetaV2DeleteMarker defines the data struct for the delete marker journal type
type xlMetaV2DeleteMarker struct {
VersionID [16]byte `json:"ID" msg:"ID"` // Version ID for delete marker
ModTime int64 `json:"MTime" msg:"MTime"` // Object delete marker modified time
MetaSys map[string][]byte `json:"MetaSys,omitempty" msg:"MetaSys,omitempty"` // Delete marker internal metadata
}
// xlMetaV2Object defines the data struct for object journal type
type xlMetaV2Object struct {
VersionID [16]byte `json:"ID" msg:"ID"` // Version ID
DataDir [16]byte `json:"DDir" msg:"DDir"` // Data dir ID
ErasureAlgorithm ErasureAlgo `json:"EcAlgo" msg:"EcAlgo"` // Erasure coding algorithm
ErasureM int `json:"EcM" msg:"EcM"` // Erasure data blocks
ErasureN int `json:"EcN" msg:"EcN"` // Erasure parity blocks
ErasureBlockSize int64 `json:"EcBSize" msg:"EcBSize"` // Erasure block size
ErasureIndex int `json:"EcIndex" msg:"EcIndex"` // Erasure disk index
ErasureDist []uint8 `json:"EcDist" msg:"EcDist"` // Erasure distribution
BitrotChecksumAlgo ChecksumAlgo `json:"CSumAlgo" msg:"CSumAlgo"` // Bitrot checksum algo
PartNumbers []int `json:"PartNums" msg:"PartNums"` // Part Numbers
PartETags []string `json:"PartETags" msg:"PartETags,allownil"` // Part ETags
PartSizes []int64 `json:"PartSizes" msg:"PartSizes"` // Part Sizes
PartActualSizes []int64 `json:"PartASizes,omitempty" msg:"PartASizes,allownil"` // Part ActualSizes (compression)
PartIndices [][]byte `json:"PartIndices,omitempty" msg:"PartIdx,omitempty"` // Part Indexes (compression)
Size int64 `json:"Size" msg:"Size"` // Object version size
ModTime int64 `json:"MTime" msg:"MTime"` // Object version modified time
MetaSys map[string][]byte `json:"MetaSys,omitempty" msg:"MetaSys,allownil"` // Object version internal metadata
MetaUser map[string]string `json:"MetaUsr,omitempty" msg:"MetaUsr,allownil"` // Object version metadata set by user
}
// xlMetaV2Version describes the journal entry, Type defines
// the current journal entry type other types might be nil based
// on what Type field carries, it is imperative for the caller
// to verify which journal type first before accessing rest of the fields.
type xlMetaV2Version struct {
Type VersionType `json:"Type" msg:"Type"`
ObjectV1 *xlMetaV1Object `json:"V1Obj,omitempty" msg:"V1Obj,omitempty"`
ObjectV2 *xlMetaV2Object `json:"V2Obj,omitempty" msg:"V2Obj,omitempty"`
DeleteMarker *xlMetaV2DeleteMarker `json:"DelObj,omitempty" msg:"DelObj,omitempty"`
WrittenByVersion uint64 `msg:"v"` // Tracks written by MinIO version
}
// xlFlags contains flags on the object.
// This can be extended up to 64 bits without breaking compatibility.
type xlFlags uint8
const (
xlFlagFreeVersion xlFlags = 1 << iota
xlFlagUsesDataDir
xlFlagInlineData
)
func (x xlFlags) String() string {
var s strings.Builder
if x&xlFlagFreeVersion != 0 {
s.WriteString("FreeVersion")
}
if x&xlFlagUsesDataDir != 0 {
if s.Len() > 0 {
s.WriteByte(',')
}
s.WriteString("UsesDD")
}
if x&xlFlagInlineData != 0 {
if s.Len() > 0 {
s.WriteByte(',')
}
s.WriteString("Inline")
}
return s.String()
}
// checkXL2V1 will check if the metadata has correct header and is a known major version.
// The remaining payload and versions are returned.
func checkXL2V1(buf []byte) (payload []byte, major, minor uint16, err error) {
if len(buf) <= 8 {
return payload, 0, 0, fmt.Errorf("xlMeta: no data")
}
if !bytes.Equal(buf[:4], xlHeader[:]) {
return payload, 0, 0, fmt.Errorf("xlMeta: unknown XLv2 header, expected %v, got %v", xlHeader[:4], buf[:4])
}
if bytes.Equal(buf[4:8], []byte("1 ")) {
// Set as 1,0.
major, minor = 1, 0
} else {
major, minor = binary.LittleEndian.Uint16(buf[4:6]), binary.LittleEndian.Uint16(buf[6:8])
}
if major > xlVersionMajor {
return buf[8:], major, minor, fmt.Errorf("xlMeta: unknown major version %d found", major)
}
return buf[8:], major, minor, nil
}
func isXL2V1Format(buf []byte) bool {
_, _, _, err := checkXL2V1(buf)
return err == nil
}
//msgp:tuple xlMetaV2VersionHeader
type xlMetaV2VersionHeader struct {
VersionID [16]byte
ModTime int64
Signature [4]byte
Type VersionType
Flags xlFlags
}
func (x xlMetaV2VersionHeader) String() string {
return fmt.Sprintf("Type: %s, VersionID: %s, Signature: %s, ModTime: %s, Flags: %s",
x.Type.String(),
hex.EncodeToString(x.VersionID[:]),
hex.EncodeToString(x.Signature[:]),
time.Unix(0, x.ModTime),
x.Flags.String(),
)
}
// matchesNotStrict returns whether x and o have both have non-zero version,
// their versions match and their type match.
// If they have zero version, modtime must match.
func (x xlMetaV2VersionHeader) matchesNotStrict(o xlMetaV2VersionHeader) bool {
if x.VersionID == [16]byte{} {
return x.VersionID == o.VersionID &&
x.Type == o.Type && o.ModTime == x.ModTime
}
return x.VersionID == o.VersionID &&
x.Type == o.Type
}
// sortsBefore can be used as a tiebreaker for stable sorting/selecting.
// Returns false on ties.
func (x xlMetaV2VersionHeader) sortsBefore(o xlMetaV2VersionHeader) bool {
if x == o {
return false
}
// Prefer newest modtime.
if x.ModTime != o.ModTime {
return x.ModTime > o.ModTime
}
// The following doesn't make too much sense, but we want sort to be consistent nonetheless.
// Prefer lower types
if x.Type != o.Type {
return x.Type < o.Type
}
// Consistent sort on signature
if v := bytes.Compare(x.Signature[:], o.Signature[:]); v != 0 {
return v > 0
}
// On ID mismatch
if v := bytes.Compare(x.VersionID[:], o.VersionID[:]); v != 0 {
return v > 0
}
// Flags
if x.Flags != o.Flags {
return x.Flags > o.Flags
}
return false
}
func (j xlMetaV2Version) getDataDir() string {
if j.Valid() {
switch j.Type {
case LegacyType:
return j.ObjectV1.DataDir
case ObjectType:
return uuid.UUID(j.ObjectV2.DataDir).String()
}
}
return ""
}
// Valid xl meta xlMetaV2Version is valid
func (j xlMetaV2Version) Valid() bool {
if !j.Type.valid() {
return false
}
switch j.Type {
case LegacyType:
return j.ObjectV1 != nil &&
j.ObjectV1.valid()
case ObjectType:
return j.ObjectV2 != nil &&
j.ObjectV2.ErasureAlgorithm.valid() &&
j.ObjectV2.BitrotChecksumAlgo.valid() &&
isXLMetaErasureInfoValid(j.ObjectV2.ErasureM, j.ObjectV2.ErasureN) &&
j.ObjectV2.ModTime > 0
case DeleteType:
return j.DeleteMarker != nil &&
j.DeleteMarker.ModTime > 0
}
return false
}
// header will return a shallow header of the version.
func (j *xlMetaV2Version) header() xlMetaV2VersionHeader {
var flags xlFlags
if j.FreeVersion() {
flags |= xlFlagFreeVersion
}
if j.Type == ObjectType && j.ObjectV2.UsesDataDir() {
flags |= xlFlagUsesDataDir
}
if j.Type == ObjectType && j.ObjectV2.InlineData() {
flags |= xlFlagInlineData
}
return xlMetaV2VersionHeader{
VersionID: j.getVersionID(),
ModTime: j.getModTime().UnixNano(),
Signature: j.getSignature(),
Type: j.Type,
Flags: flags,
}
}
// FreeVersion returns true if x represents a free-version, false otherwise.
func (x xlMetaV2VersionHeader) FreeVersion() bool {
return x.Flags&xlFlagFreeVersion != 0
}
// UsesDataDir returns true if this object version uses its data directory for
// its contents and false otherwise.
func (x xlMetaV2VersionHeader) UsesDataDir() bool {
return x.Flags&xlFlagUsesDataDir != 0
}
// InlineData returns whether inline data has been set.
// Note that false does not mean there is no inline data,
// only that it is unlikely.
func (x xlMetaV2VersionHeader) InlineData() bool {
return x.Flags&xlFlagInlineData != 0
}
// signatureErr is a signature returned when an error occurs.
var signatureErr = [4]byte{'e', 'r', 'r', 0}
// getSignature will return a signature that is expected to be the same across all disks.
func (j xlMetaV2Version) getSignature() [4]byte {
switch j.Type {
case ObjectType:
return j.ObjectV2.Signature()
case DeleteType:
return j.DeleteMarker.Signature()
case LegacyType:
return j.ObjectV1.Signature()
}
return signatureErr
}
// getModTime will return the ModTime of the underlying version.
func (j xlMetaV2Version) getModTime() time.Time {
switch j.Type {
case ObjectType:
return time.Unix(0, j.ObjectV2.ModTime)
case DeleteType:
return time.Unix(0, j.DeleteMarker.ModTime)
case LegacyType:
return j.ObjectV1.Stat.ModTime
}
return time.Time{}
}
// getVersionID will return the versionID of the underlying version.
func (j xlMetaV2Version) getVersionID() [16]byte {
switch j.Type {
case ObjectType:
return j.ObjectV2.VersionID
case DeleteType:
return j.DeleteMarker.VersionID
case LegacyType:
return [16]byte{}
}
return [16]byte{}
}
// ToFileInfo returns FileInfo of the underlying type.
func (j *xlMetaV2Version) ToFileInfo(volume, path string, allParts bool) (fi FileInfo, err error) {
if j == nil {
return fi, errFileNotFound
}
switch j.Type {
case ObjectType:
fi, err = j.ObjectV2.ToFileInfo(volume, path, allParts)
case DeleteType:
fi, err = j.DeleteMarker.ToFileInfo(volume, path)
case LegacyType:
fi, err = j.ObjectV1.ToFileInfo(volume, path)
default:
return fi, errFileNotFound
}
fi.WrittenByVersion = j.WrittenByVersion
return fi, err
}
const (
xlHeaderVersion = 2
xlMetaVersion = 2
)
func (j xlMetaV2DeleteMarker) ToFileInfo(volume, path string) (FileInfo, error) {
versionID := ""
var uv uuid.UUID
// check if the version is not "null"
if j.VersionID != uv {
versionID = uuid.UUID(j.VersionID).String()
}
fi := FileInfo{
Volume: volume,
Name: path,
ModTime: time.Unix(0, j.ModTime).UTC(),
VersionID: versionID,
Deleted: true,
}
fi.Metadata = make(map[string]string, len(j.MetaSys))
for k, v := range j.MetaSys {
fi.Metadata[k] = string(v)
}
fi.ReplicationState = GetInternalReplicationState(j.MetaSys)
if j.FreeVersion() {
fi.SetTierFreeVersion()
fi.TransitionTier = string(j.MetaSys[metaTierName])
fi.TransitionedObjName = string(j.MetaSys[metaTierObjName])
fi.TransitionVersionID = string(j.MetaSys[metaTierVersionID])
}
return fi, nil
}
// Signature will return a signature that is expected to be the same across all disks.
func (j *xlMetaV2DeleteMarker) Signature() [4]byte {
// Shallow copy
c := *j
// Marshal metadata
crc := hashDeterministicBytes(c.MetaSys)
c.MetaSys = nil
if bts, err := c.MarshalMsg(metaDataPoolGet()); err == nil {
crc ^= xxhash.Sum64(bts)
metaDataPoolPut(bts)
}
// Combine upper and lower part
var tmp [4]byte
binary.LittleEndian.PutUint32(tmp[:], uint32(crc^(crc>>32)))
return tmp
}
// UsesDataDir returns true if this object version uses its data directory for
// its contents and false otherwise.
func (j xlMetaV2Object) UsesDataDir() bool {
// Skip if this version is not transitioned, i.e it uses its data directory.
if !bytes.Equal(j.MetaSys[metaTierStatus], []byte(lifecycle.TransitionComplete)) {
return true
}
// Check if this transitioned object has been restored on disk.
return isRestoredObjectOnDisk(j.MetaUser)
}
// InlineData returns whether inline data has been set.
// Note that false does not mean there is no inline data,
// only that it is unlikely.
func (j xlMetaV2Object) InlineData() bool {
_, ok := j.MetaSys[ReservedMetadataPrefixLower+"inline-data"]
return ok
}
func (j *xlMetaV2Object) ResetInlineData() {
delete(j.MetaSys, ReservedMetadataPrefixLower+"inline-data")
}
const (
metaTierStatus = ReservedMetadataPrefixLower + TransitionStatus
metaTierObjName = ReservedMetadataPrefixLower + TransitionedObjectName
metaTierVersionID = ReservedMetadataPrefixLower + TransitionedVersionID
metaTierName = ReservedMetadataPrefixLower + TransitionTier
)
func (j *xlMetaV2Object) SetTransition(fi FileInfo) {
j.MetaSys[metaTierStatus] = []byte(fi.TransitionStatus)
j.MetaSys[metaTierObjName] = []byte(fi.TransitionedObjName)
j.MetaSys[metaTierVersionID] = []byte(fi.TransitionVersionID)
j.MetaSys[metaTierName] = []byte(fi.TransitionTier)
}
func (j *xlMetaV2Object) RemoveRestoreHdrs() {
delete(j.MetaUser, xhttp.AmzRestore)
delete(j.MetaUser, xhttp.AmzRestoreExpiryDays)
delete(j.MetaUser, xhttp.AmzRestoreRequestDate)
}
// Signature will return a signature that is expected to be the same across all disks.
func (j *xlMetaV2Object) Signature() [4]byte {
// Shallow copy
c := *j
// Zero fields that will vary across disks
c.ErasureIndex = 0
// Nil 0 size allownil, so we don't differentiate between nil and 0 len.
allEmpty := true
for _, tag := range c.PartETags {
if len(tag) != 0 {
allEmpty = false
break
}
}
if allEmpty {
c.PartETags = nil
}
if len(c.PartActualSizes) == 0 {
c.PartActualSizes = nil
}
// Get a 64 bit CRC
crc := hashDeterministicString(c.MetaUser)
crc ^= hashDeterministicBytes(c.MetaSys)
// Nil fields.
c.MetaSys = nil
c.MetaUser = nil
if bts, err := c.MarshalMsg(metaDataPoolGet()); err == nil {
crc ^= xxhash.Sum64(bts)
metaDataPoolPut(bts)
}
// Combine upper and lower part
var tmp [4]byte
binary.LittleEndian.PutUint32(tmp[:], uint32(crc^(crc>>32)))
return tmp
}
func (j xlMetaV2Object) ToFileInfo(volume, path string, allParts bool) (FileInfo, error) {
versionID := ""
var uv uuid.UUID
// check if the version is not "null"
if j.VersionID != uv {
versionID = uuid.UUID(j.VersionID).String()
}
fi := FileInfo{
Volume: volume,
Name: path,
Size: j.Size,
ModTime: time.Unix(0, j.ModTime).UTC(),
VersionID: versionID,
}
if allParts {
fi.Parts = make([]ObjectPartInfo, len(j.PartNumbers))
for i := range fi.Parts {
fi.Parts[i].Number = j.PartNumbers[i]
fi.Parts[i].Size = j.PartSizes[i]
if len(j.PartETags) == len(fi.Parts) {
fi.Parts[i].ETag = j.PartETags[i]
}
fi.Parts[i].ActualSize = j.PartActualSizes[i]
if len(j.PartIndices) == len(fi.Parts) {
fi.Parts[i].Index = j.PartIndices[i]
}
}
}
// fi.Erasure.Checksums - is left empty since we do not have any
// whole checksums for many years now, no need to allocate.
fi.Metadata = make(map[string]string, len(j.MetaUser)+len(j.MetaSys))
for k, v := range j.MetaUser {
// https://github.com/google/security-research/security/advisories/GHSA-76wf-9vgp-pj7w
if equals(k, xhttp.AmzMetaUnencryptedContentLength, xhttp.AmzMetaUnencryptedContentMD5) {
continue
}
fi.Metadata[k] = v
}
tierFVIDKey := ReservedMetadataPrefixLower + tierFVID
tierFVMarkerKey := ReservedMetadataPrefixLower + tierFVMarker
for k, v := range j.MetaSys {
// Make sure we skip free-version-id, similar to AddVersion()
if len(k) > len(ReservedMetadataPrefixLower) && strings.EqualFold(k[:len(ReservedMetadataPrefixLower)], ReservedMetadataPrefixLower) {
// Skip tierFVID, tierFVMarker keys; it's used
// only for creating free-version.
switch k {
case tierFVIDKey, tierFVMarkerKey:
continue
}
}
switch {
case strings.HasPrefix(strings.ToLower(k), ReservedMetadataPrefixLower), equals(k, VersionPurgeStatusKey):
fi.Metadata[k] = string(v)
}
}
fi.ReplicationState = getInternalReplicationState(fi.Metadata)
fi.Deleted = !fi.VersionPurgeStatus().Empty()
replStatus := fi.ReplicationState.CompositeReplicationStatus()
if replStatus != "" {
fi.Metadata[xhttp.AmzBucketReplicationStatus] = string(replStatus)
}
fi.Erasure.Algorithm = j.ErasureAlgorithm.String()
fi.Erasure.Index = j.ErasureIndex
fi.Erasure.BlockSize = j.ErasureBlockSize
fi.Erasure.DataBlocks = j.ErasureM
fi.Erasure.ParityBlocks = j.ErasureN
fi.Erasure.Distribution = make([]int, len(j.ErasureDist))
for i := range j.ErasureDist {
fi.Erasure.Distribution[i] = int(j.ErasureDist[i])
}
fi.DataDir = uuid.UUID(j.DataDir).String()
if st, ok := j.MetaSys[metaTierStatus]; ok {
fi.TransitionStatus = string(st)
}
if o, ok := j.MetaSys[metaTierObjName]; ok {
fi.TransitionedObjName = string(o)
}
if rv, ok := j.MetaSys[metaTierVersionID]; ok {
fi.TransitionVersionID = string(rv)
}
if sc, ok := j.MetaSys[metaTierName]; ok {
fi.TransitionTier = string(sc)
}
if crcs := j.MetaSys[ReservedMetadataPrefixLower+"crc"]; len(crcs) > 0 {
fi.Checksum = crcs
}
return fi, nil
}
// Read at most this much on initial read.
const metaDataReadDefault = 4 << 10
// Return used metadata byte slices here.
var metaDataPool = sync.Pool{New: func() interface{} { return make([]byte, 0, metaDataReadDefault) }}
// metaDataPoolGet will return a byte slice with capacity at least metaDataReadDefault.
// It will be length 0.
func metaDataPoolGet() []byte {
return metaDataPool.Get().([]byte)[:0]
}
// metaDataPoolPut will put an unused small buffer back into the pool.
func metaDataPoolPut(buf []byte) {
if cap(buf) >= metaDataReadDefault && cap(buf) < metaDataReadDefault*4 {
//nolint:staticcheck // SA6002 we are fine with the tiny alloc
metaDataPool.Put(buf)
}
}
// readXLMetaNoData will load the metadata, but skip data segments.
// This should only be used when data is never interesting.
// If data is not xlv2, it is returned in full.
func readXLMetaNoData(r io.Reader, size int64) ([]byte, error) {
initial := size
hasFull := true
if initial > metaDataReadDefault {
initial = metaDataReadDefault
hasFull = false
}
buf := metaDataPoolGet()[:initial]
_, err := io.ReadFull(r, buf)
if err != nil {
return nil, fmt.Errorf("readXLMetaNoData(io.ReadFull): %w", err)
}
readMore := func(n int64) error {
has := int64(len(buf))
if has >= n {
return nil
}
if hasFull || n > size {
return io.ErrUnexpectedEOF
}
extra := n - has
if int64(cap(buf)) >= n {
// Extend since we have enough space.
buf = buf[:n]
} else {
buf = append(buf, make([]byte, extra)...)
}
_, err := io.ReadFull(r, buf[has:])
if err != nil {
if errors.Is(err, io.EOF) {
// Returned if we read nothing.
err = io.ErrUnexpectedEOF
}
return fmt.Errorf("readXLMetaNoData(readMore): %w", err)
}
return nil
}
tmp, major, minor, err := checkXL2V1(buf)
if err != nil {
err = readMore(size)
return buf, err
}
switch major {
case 1:
switch minor {
case 0:
err = readMore(size)
return buf, err
case 1, 2, 3:
sz, tmp, err := msgp.ReadBytesHeader(tmp)
if err != nil {
return nil, fmt.Errorf("readXLMetaNoData(read_meta): uknown metadata version %w", err)
}
want := int64(sz) + int64(len(buf)-len(tmp))
// v1.1 does not have CRC.
if minor < 2 {
if err := readMore(want); err != nil {
return nil, err
}
return buf[:want], nil
}
// CRC is variable length, so we need to truncate exactly that.
wantMax := want + msgp.Uint32Size
if wantMax > size {
wantMax = size
}
if err := readMore(wantMax); err != nil {
return nil, err
}
if int64(len(buf)) < want {
return nil, fmt.Errorf("buffer shorter than expected (buflen: %d, want: %d): %w", len(buf), want, errFileCorrupt)
}
tmp = buf[want:]
_, after, err := msgp.ReadUint32Bytes(tmp)
if err != nil {
return nil, fmt.Errorf("readXLMetaNoData(read_meta): unknown metadata version %w", err)
}
want += int64(len(tmp) - len(after))
return buf[:want], err
default:
return nil, errors.New("unknown minor metadata version")
}
default:
return nil, errors.New("unknown major metadata version")
}
}
func decodeXLHeaders(buf []byte) (versions int, headerV, metaV uint8, b []byte, err error) {
hdrVer, buf, err := msgp.ReadUint8Bytes(buf)
if err != nil {
return 0, 0, 0, buf, err
}
metaVer, buf, err := msgp.ReadUint8Bytes(buf)
if err != nil {
return 0, 0, 0, buf, err
}
if hdrVer > xlHeaderVersion {
return 0, 0, 0, buf, fmt.Errorf("decodeXLHeaders: Unknown xl header version %d", metaVer)
}
if metaVer > xlMetaVersion {
return 0, 0, 0, buf, fmt.Errorf("decodeXLHeaders: Unknown xl meta version %d", metaVer)
}
versions, buf, err = msgp.ReadIntBytes(buf)
if err != nil {
return 0, 0, 0, buf, err
}
if versions < 0 {
return 0, 0, 0, buf, fmt.Errorf("decodeXLHeaders: Negative version count %d", versions)
}
return versions, hdrVer, metaVer, buf, nil
}
// decodeVersions will decode a number of versions from a buffer
// and perform a callback for each version in order, newest first.
// Return errDoneForNow to stop processing and return nil.
// Any non-nil error is returned.
func decodeVersions(buf []byte, versions int, fn func(idx int, hdr, meta []byte) error) (err error) {
var tHdr, tMeta []byte // Zero copy bytes
for i := 0; i < versions; i++ {
tHdr, buf, err = msgp.ReadBytesZC(buf)
if err != nil {
return err
}
tMeta, buf, err = msgp.ReadBytesZC(buf)
if err != nil {
return err
}
if err = fn(i, tHdr, tMeta); err != nil {
if err == errDoneForNow {
err = nil
}
return err
}
}
return nil
}
// isIndexedMetaV2 returns non-nil result if metadata is indexed.
// Returns 3x nil if not XLV2 or not indexed.
// If indexed and unable to parse an error will be returned.
func isIndexedMetaV2(buf []byte) (meta xlMetaBuf, data xlMetaInlineData, err error) {
buf, major, minor, err := checkXL2V1(buf)
if err != nil || major != 1 || minor < 3 {
return nil, nil, nil
}
meta, buf, err = msgp.ReadBytesZC(buf)
if err != nil {
return nil, nil, err
}
if crc, nbuf, err := msgp.ReadUint32Bytes(buf); err == nil {
// Read metadata CRC
buf = nbuf
if got := uint32(xxhash.Sum64(meta)); got != crc {
return nil, nil, fmt.Errorf("xlMetaV2.Load version(%d), CRC mismatch, want 0x%x, got 0x%x", minor, crc, got)
}
} else {
return nil, nil, err
}
data = buf
if data.validate() != nil {
data.repair()
}
return meta, data, nil
}
type xlMetaV2ShallowVersion struct {
header xlMetaV2VersionHeader
meta []byte
}
//msgp:ignore xlMetaV2 xlMetaV2ShallowVersion
type xlMetaV2 struct {
versions []xlMetaV2ShallowVersion
// data will contain raw data if any.
// data will be one or more versions indexed by versionID.
// To remove all data set to nil.
data xlMetaInlineData
// metadata version.
metaV uint8
}
// LoadOrConvert will load the metadata in the buffer.
// If this is a legacy format, it will automatically be converted to XLV2.
func (x *xlMetaV2) LoadOrConvert(buf []byte) error {
if isXL2V1Format(buf) {
return x.Load(buf)
}
xlMeta := &xlMetaV1Object{}
json := jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal(buf, xlMeta); err != nil {
return errFileCorrupt
}
if len(x.versions) > 0 {
x.versions = x.versions[:0]
}
x.data = nil
x.metaV = xlMetaVersion
return x.AddLegacy(xlMeta)
}
// Load all versions of the stored data.
// Note that references to the incoming buffer will be kept.
func (x *xlMetaV2) Load(buf []byte) error {
if meta, data, err := isIndexedMetaV2(buf); err != nil {
return err
} else if meta != nil {
return x.loadIndexed(meta, data)
}
// Convert older format.
return x.loadLegacy(buf)
}
func (x *xlMetaV2) loadIndexed(buf xlMetaBuf, data xlMetaInlineData) error {
versions, headerV, metaV, buf, err := decodeXLHeaders(buf)
if err != nil {
return err
}
if cap(x.versions) < versions {
x.versions = make([]xlMetaV2ShallowVersion, 0, versions+1)
}
x.versions = x.versions[:versions]
x.data = data
x.metaV = metaV
if err = x.data.validate(); err != nil {
x.data.repair()
logger.LogIf(GlobalContext, fmt.Errorf("xlMetaV2.loadIndexed: data validation failed: %v. %d entries after repair", err, x.data.entries()))
}
return decodeVersions(buf, versions, func(i int, hdr, meta []byte) error {
ver := &x.versions[i]
_, err = ver.header.unmarshalV(headerV, hdr)
if err != nil {
return err
}
ver.meta = meta
// Fix inconsistent x-minio-internal-replication-timestamp by loading and reindexing.
if metaV < 2 && ver.header.Type == DeleteType {
// load (and convert) version.
version, err := x.getIdx(i)
if err == nil {
// Only reindex if set.
_, ok1 := version.DeleteMarker.MetaSys[ReservedMetadataPrefixLower+ReplicationTimestamp]
_, ok2 := version.DeleteMarker.MetaSys[ReservedMetadataPrefixLower+ReplicaTimestamp]
if ok1 || ok2 {
meta, err := version.MarshalMsg(make([]byte, 0, len(ver.meta)+10))
if err == nil {
// Override both if fine.
ver.header = version.header()
ver.meta = meta
}
}
}
}
return nil
})
}
// loadLegacy will load content prior to v1.3
// Note that references to the incoming buffer will be kept.
func (x *xlMetaV2) loadLegacy(buf []byte) error {
buf, major, minor, err := checkXL2V1(buf)
if err != nil {
return fmt.Errorf("xlMetaV2.Load %w", err)
}
var allMeta []byte
switch major {
case 1:
switch minor {
case 0:
allMeta = buf
case 1, 2:
v, buf, err := msgp.ReadBytesZC(buf)
if err != nil {
return fmt.Errorf("xlMetaV2.Load version(%d), bufLen(%d) %w", minor, len(buf), err)
}
if minor >= 2 {
if crc, nbuf, err := msgp.ReadUint32Bytes(buf); err == nil {
// Read metadata CRC (added in v2)
buf = nbuf
if got := uint32(xxhash.Sum64(v)); got != crc {
return fmt.Errorf("xlMetaV2.Load version(%d), CRC mismatch, want 0x%x, got 0x%x", minor, crc, got)
}
} else {
return fmt.Errorf("xlMetaV2.Load version(%d), loading CRC: %w", minor, err)
}
}
allMeta = v
// Add remaining data.
x.data = buf
if err = x.data.validate(); err != nil {
x.data.repair()
logger.LogIf(GlobalContext, fmt.Errorf("xlMetaV2.Load: data validation failed: %v. %d entries after repair", err, x.data.entries()))
}
default:
return errors.New("unknown minor metadata version")
}
default:
return errors.New("unknown major metadata version")
}
if allMeta == nil {
return errFileCorrupt
}
// bts will shrink as we decode.
bts := allMeta
var field []byte
var zb0001 uint32
zb0001, bts, err = msgp.ReadMapHeaderBytes(bts)
if err != nil {
return msgp.WrapError(err, "loadLegacy.ReadMapHeader")
}
var tmp xlMetaV2Version
for zb0001 > 0 {
zb0001--
field, bts, err = msgp.ReadMapKeyZC(bts)
if err != nil {
return msgp.WrapError(err, "loadLegacy.ReadMapKey")
}
switch msgp.UnsafeString(field) {
case "Versions":
var zb0002 uint32
zb0002, bts, err = msgp.ReadArrayHeaderBytes(bts)
if err != nil {
return msgp.WrapError(err, "Versions")
}
if cap(x.versions) >= int(zb0002) {
x.versions = (x.versions)[:zb0002]
} else {
x.versions = make([]xlMetaV2ShallowVersion, zb0002, zb0002+1)
}
for za0001 := range x.versions {
start := len(allMeta) - len(bts)
bts, err = tmp.unmarshalV(1, bts)
if err != nil {
return msgp.WrapError(err, "Versions", za0001)
}
end := len(allMeta) - len(bts)
// We reference the marshaled data, so we don't have to re-marshal.
x.versions[za0001] = xlMetaV2ShallowVersion{
header: tmp.header(),
meta: allMeta[start:end],
}
}
default:
bts, err = msgp.Skip(bts)
if err != nil {
return msgp.WrapError(err, "loadLegacy.Skip")
}
}
}
x.metaV = 1 // Fixed for legacy conversions.
x.sortByModTime()
return nil
}
// latestModtime returns the modtime of the latest version.
func (x *xlMetaV2) latestModtime() time.Time {
if x == nil || len(x.versions) == 0 {
return time.Time{}
}
return time.Unix(0, x.versions[0].header.ModTime)
}
func (x *xlMetaV2) addVersion(ver xlMetaV2Version) error {
modTime := ver.getModTime().UnixNano()
if !ver.Valid() {
return errors.New("attempted to add invalid version")
}
encoded, err := ver.MarshalMsg(nil)
if err != nil {
return err
}
// returns error if we have exceeded maxObjectVersions
if len(x.versions)+1 > maxObjectVersions {
return errMaxVersionsExceeded
}
// Add space at the end.
// Will have -1 modtime, so it will be inserted there.
x.versions = append(x.versions, xlMetaV2ShallowVersion{header: xlMetaV2VersionHeader{ModTime: -1}})
// Linear search, we likely have to insert at front.
for i, existing := range x.versions {
if existing.header.ModTime <= modTime {
// Insert at current idx. First move current back.
copy(x.versions[i+1:], x.versions[i:])
x.versions[i] = xlMetaV2ShallowVersion{
header: ver.header(),
meta: encoded,
}
return nil
}
}
return fmt.Errorf("addVersion: Internal error, unable to add version")
}
// AppendTo will marshal the data in z and append it to the provided slice.
func (x *xlMetaV2) AppendTo(dst []byte) ([]byte, error) {
// Header...
sz := len(xlHeader) + len(xlVersionCurrent) + msgp.ArrayHeaderSize + len(dst) + 3*msgp.Uint32Size
// Existing + Inline data
sz += len(dst) + len(x.data)
// Versions...
for _, ver := range x.versions {
sz += 32 + len(ver.meta)
}
if cap(dst) < sz {
buf := make([]byte, len(dst), sz)
copy(buf, dst)
dst = buf
}
if err := x.data.validate(); err != nil {
return nil, err
}
dst = append(dst, xlHeader[:]...)
dst = append(dst, xlVersionCurrent[:]...)
// Add "bin 32" type header to always have enough space.
// We will fill out the correct size when we know it.
dst = append(dst, 0xc6, 0, 0, 0, 0)
dataOffset := len(dst)
dst = msgp.AppendUint(dst, xlHeaderVersion)
dst = msgp.AppendUint(dst, xlMetaVersion)
dst = msgp.AppendInt(dst, len(x.versions))
tmp := metaDataPoolGet()
defer metaDataPoolPut(tmp)
for _, ver := range x.versions {
var err error
// Add header
tmp, err = ver.header.MarshalMsg(tmp[:0])
if err != nil {
return nil, err
}
dst = msgp.AppendBytes(dst, tmp)
// Add full meta
dst = msgp.AppendBytes(dst, ver.meta)
}
// Update size...
binary.BigEndian.PutUint32(dst[dataOffset-4:dataOffset], uint32(len(dst)-dataOffset))
// Add CRC of metadata as fixed size (5 bytes)
// Prior to v1.3 this was variable sized.
tmp = tmp[:5]
tmp[0] = 0xce // muint32
binary.BigEndian.PutUint32(tmp[1:], uint32(xxhash.Sum64(dst[dataOffset:])))
dst = append(dst, tmp[:5]...)
return append(dst, x.data...), nil
}
const emptyUUID = "00000000-0000-0000-0000-000000000000"
func (x *xlMetaV2) findVersionStr(key string) (idx int, ver *xlMetaV2Version, err error) {
if key == nullVersionID {
key = ""
}
var u uuid.UUID
if key != "" {
u, err = uuid.Parse(key)
if err != nil {
return -1, nil, errFileVersionNotFound
}
}
return x.findVersion(u)
}
func (x *xlMetaV2) findVersion(key [16]byte) (idx int, ver *xlMetaV2Version, err error) {
for i, ver := range x.versions {
if key == ver.header.VersionID {
obj, err := x.getIdx(i)
return i, obj, err
}
}
return -1, nil, errFileVersionNotFound
}
func (x *xlMetaV2) getIdx(idx int) (ver *xlMetaV2Version, err error) {
if idx < 0 || idx >= len(x.versions) {
return nil, errFileNotFound
}
var dst xlMetaV2Version
_, err = dst.unmarshalV(x.metaV, x.versions[idx].meta)
if false {
if err == nil && x.versions[idx].header.VersionID != dst.getVersionID() {
panic(fmt.Sprintf("header: %x != object id: %x", x.versions[idx].header.VersionID, dst.getVersionID()))
}
}
return &dst, err
}
// setIdx will replace a version at a given index.
// Note that versions may become re-sorted if modtime changes.
func (x *xlMetaV2) setIdx(idx int, ver xlMetaV2Version) (err error) {
if idx < 0 || idx >= len(x.versions) {
return errFileNotFound
}
update := &x.versions[idx]
prevMod := update.header.ModTime
update.meta, err = ver.MarshalMsg(update.meta[:0:len(update.meta)])
if err != nil {
update.meta = nil
return err
}
update.header = ver.header()
if prevMod != update.header.ModTime {
x.sortByModTime()
}
return nil
}
// getDataDirs will return all data directories in the metadata
// as well as all version ids used for inline data.
func (x *xlMetaV2) getDataDirs() ([]string, error) {
dds := make([]string, len(x.versions)*2)
for i, ver := range x.versions {
if ver.header.Type == DeleteType {
continue
}
obj, err := x.getIdx(i)
if err != nil {
return nil, err
}
switch ver.header.Type {
case ObjectType:
if obj.ObjectV2 == nil {
return nil, errors.New("obj.ObjectV2 unexpectedly nil")
}
dds = append(dds, uuid.UUID(obj.ObjectV2.DataDir).String())
if obj.ObjectV2.VersionID == [16]byte{} {
dds = append(dds, nullVersionID)
} else {
dds = append(dds, uuid.UUID(obj.ObjectV2.VersionID).String())
}
case LegacyType:
if obj.ObjectV1 == nil {
return nil, errors.New("obj.ObjectV1 unexpectedly nil")
}
dds = append(dds, obj.ObjectV1.DataDir)
}
}
return dds, nil
}
// sortByModTime will sort versions by modtime in descending order,
// meaning index 0 will be latest version.
func (x *xlMetaV2) sortByModTime() {
// Quick check
if len(x.versions) <= 1 || sort.SliceIsSorted(x.versions, func(i, j int) bool {
return x.versions[i].header.sortsBefore(x.versions[j].header)
}) {
return
}
// We should sort.
sort.Slice(x.versions, func(i, j int) bool {
return x.versions[i].header.sortsBefore(x.versions[j].header)
})
}
// DeleteVersion deletes the version specified by version id.
// returns to the caller which dataDir to delete, also
// indicates if this is the last version.
func (x *xlMetaV2) DeleteVersion(fi FileInfo) (string, error) {
// This is a situation where versionId is explicitly
// specified as "null", as we do not save "null"
// string it is considered empty. But empty also
// means the version which matches will be purged.
if fi.VersionID == nullVersionID {
fi.VersionID = ""
}
var uv uuid.UUID
var err error
if fi.VersionID != "" {
uv, err = uuid.Parse(fi.VersionID)
if err != nil {
return "", errFileVersionNotFound
}
}
var ventry xlMetaV2Version
if fi.Deleted {
ventry = xlMetaV2Version{
Type: DeleteType,
DeleteMarker: &xlMetaV2DeleteMarker{
VersionID: uv,
ModTime: fi.ModTime.UnixNano(),
MetaSys: make(map[string][]byte),
},
WrittenByVersion: globalVersionUnix,
}
if !ventry.Valid() {
return "", errors.New("internal error: invalid version entry generated")
}
}
updateVersion := false
if fi.VersionPurgeStatus().Empty() && (fi.DeleteMarkerReplicationStatus() == "REPLICA" || fi.DeleteMarkerReplicationStatus().Empty()) {
updateVersion = fi.MarkDeleted
} else {
// for replication scenario
if fi.Deleted && fi.VersionPurgeStatus() != Complete {
if !fi.VersionPurgeStatus().Empty() || fi.DeleteMarkerReplicationStatus().Empty() {
updateVersion = true
}
}
// object or delete-marker versioned delete is not complete
if !fi.VersionPurgeStatus().Empty() && fi.VersionPurgeStatus() != Complete {
updateVersion = true
}
}
if fi.Deleted {
if !fi.DeleteMarkerReplicationStatus().Empty() {
switch fi.DeleteMarkerReplicationStatus() {
case replication.Replica:
ventry.DeleteMarker.MetaSys[ReservedMetadataPrefixLower+ReplicaStatus] = []byte(fi.ReplicationState.ReplicaStatus)
ventry.DeleteMarker.MetaSys[ReservedMetadataPrefixLower+ReplicaTimestamp] = []byte(fi.ReplicationState.ReplicaTimeStamp.UTC().Format(time.RFC3339Nano))
default:
ventry.DeleteMarker.MetaSys[ReservedMetadataPrefixLower+ReplicationStatus] = []byte(fi.ReplicationState.ReplicationStatusInternal)
ventry.DeleteMarker.MetaSys[ReservedMetadataPrefixLower+ReplicationTimestamp] = []byte(fi.ReplicationState.ReplicationTimeStamp.UTC().Format(time.RFC3339Nano))
}
}
if !fi.VersionPurgeStatus().Empty() {
ventry.DeleteMarker.MetaSys[VersionPurgeStatusKey] = []byte(fi.ReplicationState.VersionPurgeStatusInternal)
}
for k, v := range fi.ReplicationState.ResetStatusesMap {
ventry.DeleteMarker.MetaSys[k] = []byte(v)
}
}
for i, ver := range x.versions {
if ver.header.VersionID != uv {
continue
}
switch ver.header.Type {
case LegacyType:
ver, err := x.getIdx(i)
if err != nil {
return "", err
}
x.versions = append(x.versions[:i], x.versions[i+1:]...)
if fi.Deleted {
err = x.addVersion(ventry)
}
return ver.ObjectV1.DataDir, err
case DeleteType:
if updateVersion {
ver, err := x.getIdx(i)
if err != nil {
return "", err
}
if len(ver.DeleteMarker.MetaSys) == 0 {
ver.DeleteMarker.MetaSys = make(map[string][]byte)
}
if !fi.DeleteMarkerReplicationStatus().Empty() {
switch fi.DeleteMarkerReplicationStatus() {
case replication.Replica:
ver.DeleteMarker.MetaSys[ReservedMetadataPrefixLower+ReplicaStatus] = []byte(fi.ReplicationState.ReplicaStatus)
ver.DeleteMarker.MetaSys[ReservedMetadataPrefixLower+ReplicaTimestamp] = []byte(fi.ReplicationState.ReplicaTimeStamp.UTC().Format(time.RFC3339Nano))
default:
ver.DeleteMarker.MetaSys[ReservedMetadataPrefixLower+ReplicationStatus] = []byte(fi.ReplicationState.ReplicationStatusInternal)
ver.DeleteMarker.MetaSys[ReservedMetadataPrefixLower+ReplicationTimestamp] = []byte(fi.ReplicationState.ReplicationTimeStamp.UTC().Format(time.RFC3339Nano))
}
}
if !fi.VersionPurgeStatus().Empty() {
ver.DeleteMarker.MetaSys[VersionPurgeStatusKey] = []byte(fi.ReplicationState.VersionPurgeStatusInternal)
}
for k, v := range fi.ReplicationState.ResetStatusesMap {
ver.DeleteMarker.MetaSys[k] = []byte(v)
}
err = x.setIdx(i, *ver)
return "", err
}
var err error
x.versions = append(x.versions[:i], x.versions[i+1:]...)
if fi.MarkDeleted && (fi.VersionPurgeStatus().Empty() || (fi.VersionPurgeStatus() != Complete)) {
err = x.addVersion(ventry)
}
return "", err
case ObjectType:
if updateVersion && !fi.Deleted {
ver, err := x.getIdx(i)
if err != nil {
return "", err
}
ver.ObjectV2.MetaSys[VersionPurgeStatusKey] = []byte(fi.ReplicationState.VersionPurgeStatusInternal)
for k, v := range fi.ReplicationState.ResetStatusesMap {
ver.ObjectV2.MetaSys[k] = []byte(v)
}
err = x.setIdx(i, *ver)
return uuid.UUID(ver.ObjectV2.DataDir).String(), err
}
}
}
for i, version := range x.versions {
if version.header.Type != ObjectType || version.header.VersionID != uv {
continue
}
ver, err := x.getIdx(i)
if err != nil {
return "", err
}
switch {
case fi.ExpireRestored:
ver.ObjectV2.RemoveRestoreHdrs()
err = x.setIdx(i, *ver)
case fi.TransitionStatus == lifecycle.TransitionComplete:
ver.ObjectV2.SetTransition(fi)
ver.ObjectV2.ResetInlineData()
err = x.setIdx(i, *ver)
default:
x.versions = append(x.versions[:i], x.versions[i+1:]...)
// if uv has tiered content we add a
// free-version to track it for
// asynchronous deletion via scanner.
if freeVersion, toFree := ver.ObjectV2.InitFreeVersion(fi); toFree {
err = x.addVersion(freeVersion)
}
}
if fi.Deleted {
err = x.addVersion(ventry)
}
if x.SharedDataDirCount(ver.ObjectV2.VersionID, ver.ObjectV2.DataDir) > 0 {
// Found that another version references the same dataDir
// we shouldn't remove it, and only remove the version instead
return "", nil
}
return uuid.UUID(ver.ObjectV2.DataDir).String(), err
}
if fi.Deleted {
err = x.addVersion(ventry)
return "", err
}
return "", errFileVersionNotFound
}
// xlMetaDataDirDecoder is a shallow decoder for decoding object datadir only.
type xlMetaDataDirDecoder struct {
ObjectV2 *struct {
DataDir [16]byte `msg:"DDir"` // Data dir ID
} `msg:"V2Obj,omitempty"`
}
// UpdateObjectVersion updates metadata and modTime for a given
// versionID, NOTE: versionID must be valid and should exist -
// and must not be a DeleteMarker or legacy object, if no
// versionID is specified 'null' versionID is updated instead.
//
// It is callers responsibility to set correct versionID, this
// function shouldn't be further extended to update immutable
// values such as ErasureInfo, ChecksumInfo.
//
// Metadata is only updated to new values, existing values
// stay as is, if you wish to update all values you should
// update all metadata freshly before calling this function
// in-case you wish to clear existing metadata.
func (x *xlMetaV2) UpdateObjectVersion(fi FileInfo) error {
if fi.VersionID == "" {
// this means versioning is not yet
// enabled or suspend i.e all versions
// are basically default value i.e "null"
fi.VersionID = nullVersionID
}
var uv uuid.UUID
var err error
if fi.VersionID != "" && fi.VersionID != nullVersionID {
uv, err = uuid.Parse(fi.VersionID)
if err != nil {
return err
}
}
for i, version := range x.versions {
switch version.header.Type {
case LegacyType, DeleteType:
if version.header.VersionID == uv {
return errMethodNotAllowed
}
case ObjectType:
if version.header.VersionID == uv {
ver, err := x.getIdx(i)
if err != nil {
return err
}
for k, v := range fi.Metadata {
if len(k) > len(ReservedMetadataPrefixLower) && strings.EqualFold(k[:len(ReservedMetadataPrefixLower)], ReservedMetadataPrefixLower) {
ver.ObjectV2.MetaSys[k] = []byte(v)
} else {
ver.ObjectV2.MetaUser[k] = v
}
}
if !fi.ModTime.IsZero() {
ver.ObjectV2.ModTime = fi.ModTime.UnixNano()
}
return x.setIdx(i, *ver)
}
}
}
return errFileVersionNotFound
}
// AddVersion adds a new version
func (x *xlMetaV2) AddVersion(fi FileInfo) error {
if fi.VersionID == "" {
// this means versioning is not yet
// enabled or suspend i.e all versions
// are basically default value i.e "null"
fi.VersionID = nullVersionID
}
var uv uuid.UUID
var err error
if fi.VersionID != "" && fi.VersionID != nullVersionID {
uv, err = uuid.Parse(fi.VersionID)
if err != nil {
return err
}
}
var dd uuid.UUID
if fi.DataDir != "" {
dd, err = uuid.Parse(fi.DataDir)
if err != nil {
return err
}
}
ventry := xlMetaV2Version{
WrittenByVersion: globalVersionUnix,
}
if fi.Deleted {
ventry.Type = DeleteType
ventry.DeleteMarker = &xlMetaV2DeleteMarker{
VersionID: uv,
ModTime: fi.ModTime.UnixNano(),
MetaSys: make(map[string][]byte),
}
} else {
ventry.Type = ObjectType
ventry.ObjectV2 = &xlMetaV2Object{
VersionID: uv,
DataDir: dd,
Size: fi.Size,
ModTime: fi.ModTime.UnixNano(),
ErasureAlgorithm: ReedSolomon,
ErasureM: fi.Erasure.DataBlocks,
ErasureN: fi.Erasure.ParityBlocks,
ErasureBlockSize: fi.Erasure.BlockSize,
ErasureIndex: fi.Erasure.Index,
BitrotChecksumAlgo: HighwayHash,
ErasureDist: make([]uint8, len(fi.Erasure.Distribution)),
PartNumbers: make([]int, len(fi.Parts)),
PartETags: nil,
PartSizes: make([]int64, len(fi.Parts)),
PartActualSizes: make([]int64, len(fi.Parts)),
MetaSys: make(map[string][]byte),
MetaUser: make(map[string]string, len(fi.Metadata)),
}
for i := range fi.Parts {
// Only add etags if any.
if fi.Parts[i].ETag != "" {
ventry.ObjectV2.PartETags = make([]string, len(fi.Parts))
break
}
}
for i := range fi.Parts {
// Only add indices if any.
if len(fi.Parts[i].Index) > 0 {
ventry.ObjectV2.PartIndices = make([][]byte, len(fi.Parts))
break
}
}
for i := range fi.Erasure.Distribution {
ventry.ObjectV2.ErasureDist[i] = uint8(fi.Erasure.Distribution[i])
}
for i := range fi.Parts {
ventry.ObjectV2.PartSizes[i] = fi.Parts[i].Size
if len(ventry.ObjectV2.PartETags) > 0 && fi.Parts[i].ETag != "" {
ventry.ObjectV2.PartETags[i] = fi.Parts[i].ETag
}
ventry.ObjectV2.PartNumbers[i] = fi.Parts[i].Number
ventry.ObjectV2.PartActualSizes[i] = fi.Parts[i].ActualSize
if len(ventry.ObjectV2.PartIndices) > 0 {
ventry.ObjectV2.PartIndices[i] = fi.Parts[i].Index
}
}
tierFVIDKey := ReservedMetadataPrefixLower + tierFVID
tierFVMarkerKey := ReservedMetadataPrefixLower + tierFVMarker
for k, v := range fi.Metadata {
if len(k) > len(ReservedMetadataPrefixLower) && strings.EqualFold(k[:len(ReservedMetadataPrefixLower)], ReservedMetadataPrefixLower) {
// Skip tierFVID, tierFVMarker keys; it's used
// only for creating free-version.
// Skip xMinIOHealing, it's used only in RenameData
switch k {
case tierFVIDKey, tierFVMarkerKey, xMinIOHealing:
continue
}
ventry.ObjectV2.MetaSys[k] = []byte(v)
} else {
ventry.ObjectV2.MetaUser[k] = v
}
}
// If asked to save data.
if len(fi.Data) > 0 || fi.Size == 0 {
x.data.replace(fi.VersionID, fi.Data)
}
if fi.TransitionStatus != "" {
ventry.ObjectV2.MetaSys[metaTierStatus] = []byte(fi.TransitionStatus)
}
if fi.TransitionedObjName != "" {
ventry.ObjectV2.MetaSys[metaTierObjName] = []byte(fi.TransitionedObjName)
}
if fi.TransitionVersionID != "" {
ventry.ObjectV2.MetaSys[metaTierVersionID] = []byte(fi.TransitionVersionID)
}
if fi.TransitionTier != "" {
ventry.ObjectV2.MetaSys[metaTierName] = []byte(fi.TransitionTier)
}
if len(fi.Checksum) > 0 {
ventry.ObjectV2.MetaSys[ReservedMetadataPrefixLower+"crc"] = fi.Checksum
}
}
if !ventry.Valid() {
return errors.New("internal error: invalid version entry generated")
}
// Check if we should replace first.
for i := range x.versions {
if x.versions[i].header.VersionID != uv {
continue
}
switch x.versions[i].header.Type {
case LegacyType:
// This would convert legacy type into new ObjectType
// this means that we are basically purging the `null`
// version of the object.
return x.setIdx(i, ventry)
case ObjectType:
return x.setIdx(i, ventry)
case DeleteType:
// Allowing delete marker to replaced with proper
// object data type as well, this is not S3 complaint
// behavior but kept here for future flexibility.
return x.setIdx(i, ventry)
}
}
// We did not find it, add it.
return x.addVersion(ventry)
}
func (x *xlMetaV2) SharedDataDirCount(versionID [16]byte, dataDir [16]byte) int {
// v2 object is inlined, if it is skip dataDir share check.
if x.data.entries() > 0 && x.data.find(uuid.UUID(versionID).String()) != nil {
return 0
}
var sameDataDirCount int
var decoded xlMetaDataDirDecoder
for _, version := range x.versions {
if version.header.Type != ObjectType || version.header.VersionID == versionID || !version.header.UsesDataDir() {
continue
}
_, err := decoded.UnmarshalMsg(version.meta)
if err != nil || decoded.ObjectV2 == nil || decoded.ObjectV2.DataDir != dataDir {
continue
}
sameDataDirCount++
}
return sameDataDirCount
}
func (x *xlMetaV2) SharedDataDirCountStr(versionID, dataDir string) int {
var (
uv uuid.UUID
ddir uuid.UUID
err error
)
if versionID == nullVersionID {
versionID = ""
}
if versionID != "" {
uv, err = uuid.Parse(versionID)
if err != nil {
return 0
}
}
ddir, err = uuid.Parse(dataDir)
if err != nil {
return 0
}
return x.SharedDataDirCount(uv, ddir)
}
// AddLegacy adds a legacy version, is only called when no prior
// versions exist, safe to use it by only one function in xl-storage(RenameData)
func (x *xlMetaV2) AddLegacy(m *xlMetaV1Object) error {
if !m.valid() {
return errFileCorrupt
}
m.VersionID = nullVersionID
return x.addVersion(xlMetaV2Version{ObjectV1: m, Type: LegacyType, WrittenByVersion: globalVersionUnix})
}
// ToFileInfo converts xlMetaV2 into a common FileInfo datastructure
// for consumption across callers.
func (x xlMetaV2) ToFileInfo(volume, path, versionID string, inclFreeVers, allParts bool) (fi FileInfo, err error) {
var uv uuid.UUID
if versionID != "" && versionID != nullVersionID {
uv, err = uuid.Parse(versionID)
if err != nil {
logger.LogIf(GlobalContext, fmt.Errorf("invalid versionID specified %s", versionID))
return fi, errFileVersionNotFound
}
}
var succModTime int64
isLatest := true
nonFreeVersions := len(x.versions)
var (
freeFi FileInfo
freeFound bool
)
found := false
for _, ver := range x.versions {
header := &ver.header
// skip listing free-version unless explicitly requested via versionID
if header.FreeVersion() {
nonFreeVersions--
// remember the latest free version; will return this FileInfo if no non-free version remain
var freeVersion xlMetaV2Version
if inclFreeVers && !freeFound {
// ignore unmarshalling errors, will return errFileNotFound in that case
if _, err := freeVersion.unmarshalV(x.metaV, ver.meta); err == nil {
if freeFi, err = freeVersion.ToFileInfo(volume, path, allParts); err == nil {
freeFi.IsLatest = true // when this is returned, it would be the latest free version remaining.
freeFound = true
}
}
}
if header.VersionID != uv {
continue
}
}
if found {
continue
}
// We need a specific version, skip...
if versionID != "" && uv != header.VersionID {
isLatest = false
succModTime = header.ModTime
continue
}
// We found what we need.
found = true
var version xlMetaV2Version
if _, err := version.unmarshalV(x.metaV, ver.meta); err != nil {
return fi, err
}
if fi, err = version.ToFileInfo(volume, path, allParts); err != nil {
return fi, err
}
fi.IsLatest = isLatest
if succModTime != 0 {
fi.SuccessorModTime = time.Unix(0, succModTime)
}
}
if !found {
if versionID == "" {
if inclFreeVers && nonFreeVersions == 0 {
if freeFound {
return freeFi, nil
}
}
return FileInfo{}, errFileNotFound
}
return FileInfo{}, errFileVersionNotFound
}
fi.NumVersions = nonFreeVersions
return fi, err
}
// ListVersions lists current versions, and current deleted
// versions returns error for unexpected entries.
// showPendingDeletes is set to true if ListVersions needs to list objects marked deleted
// but waiting to be replicated
func (x xlMetaV2) ListVersions(volume, path string, allParts bool) ([]FileInfo, error) {
versions := make([]FileInfo, 0, len(x.versions))
var err error
var dst xlMetaV2Version
for _, version := range x.versions {
_, err = dst.unmarshalV(x.metaV, version.meta)
if err != nil {
return versions, err
}
fi, err := dst.ToFileInfo(volume, path, allParts)
if err != nil {
return versions, err
}
fi.NumVersions = len(x.versions)
versions = append(versions, fi)
}
for i := range versions {
versions[i].NumVersions = len(versions)
if i > 0 {
versions[i].SuccessorModTime = versions[i-1].ModTime
}
}
if len(versions) > 0 {
versions[0].IsLatest = true
}
return versions, nil
}
// mergeXLV2Versions will merge all versions, typically from different disks
// that have at least quorum entries in all metas.
// Quorum must be the minimum number of matching metadata files.
// Quorum should be > 1 and <= len(versions).
// If strict is set to false, entries that match type
func mergeXLV2Versions(quorum int, strict bool, requestedVersions int, versions ...[]xlMetaV2ShallowVersion) (merged []xlMetaV2ShallowVersion) {
if quorum <= 0 {
quorum = 1
}
if len(versions) < quorum || len(versions) == 0 {
return nil
}
if len(versions) == 1 {
return versions[0]
}
if quorum == 1 {
// No need for non-strict checks if quorum is 1.
strict = true
}
// Shallow copy input
versions = append(make([][]xlMetaV2ShallowVersion, 0, len(versions)), versions...)
var nVersions int // captures all non-free versions
// Our result
merged = make([]xlMetaV2ShallowVersion, 0, len(versions[0]))
tops := make([]xlMetaV2ShallowVersion, len(versions))
for {
// Step 1 create slice with all top versions.
tops = tops[:0]
var topSig xlMetaV2VersionHeader
consistent := true // Are all signatures consistent (shortcut)
for _, vers := range versions {
if len(vers) == 0 {
consistent = false
continue
}
ver := vers[0]
if len(tops) == 0 {
consistent = true
topSig = ver.header
} else {
consistent = consistent && ver.header == topSig
}
tops = append(tops, vers[0])
}
// Check if done...
if len(tops) < quorum {
// We couldn't gather enough for quorum
break
}
var latest xlMetaV2ShallowVersion
if consistent {
// All had the same signature, easy.
latest = tops[0]
merged = append(merged, latest)
// Calculate latest 'n' non-free versions.
if !latest.header.FreeVersion() {
nVersions++
}
} else {
// Find latest.
var latestCount int
for i, ver := range tops {
if ver.header == latest.header {
latestCount++
continue
}
if i == 0 || ver.header.sortsBefore(latest.header) {
switch {
case i == 0 || latestCount == 0:
latestCount = 1
case !strict && ver.header.matchesNotStrict(latest.header):
latestCount++
default:
latestCount = 1
}
latest = ver
continue
}
// Mismatch, but older.
if latestCount > 0 && !strict && ver.header.matchesNotStrict(latest.header) {
latestCount++
continue
}
if latestCount > 0 && ver.header.VersionID == latest.header.VersionID {
// Version IDs match, but otherwise unable to resolve.
// We are either strict, or don't have enough information to match.
// Switch to a pure counting algo.
x := make(map[xlMetaV2VersionHeader]int, len(tops))
for _, a := range tops {
if a.header.VersionID != ver.header.VersionID {
continue
}
if !strict {
a.header.Signature = [4]byte{}
}
x[a.header]++
}
latestCount = 0
for k, v := range x {
if v < latestCount {
continue
}
if v == latestCount && latest.header.sortsBefore(k) {
// Tiebreak, use sort.
continue
}
for _, a := range tops {
hdr := a.header
if !strict {
hdr.Signature = [4]byte{}
}
if hdr == k {
latest = a
}
}
latestCount = v
}
break
}
}
if latestCount >= quorum {
merged = append(merged, latest)
// Calculate latest 'n' non-free versions.
if !latest.header.FreeVersion() {
nVersions++
}
}
}
// Remove from all streams up until latest modtime or if selected.
for i, vers := range versions {
for _, ver := range vers {
// Truncate later modtimes, not selected.
if ver.header.ModTime > latest.header.ModTime {
versions[i] = versions[i][1:]
continue
}
// Truncate matches
if ver.header == latest.header {
versions[i] = versions[i][1:]
continue
}
// Truncate non-empty version and type matches
if latest.header.VersionID == ver.header.VersionID {
versions[i] = versions[i][1:]
continue
}
// Skip versions with version id we already emitted.
for _, mergedV := range merged {
if ver.header.VersionID == mergedV.header.VersionID {
versions[i] = versions[i][1:]
continue
}
}
// Keep top entry (and remaining)...
break
}
}
if requestedVersions > 0 && requestedVersions == nVersions {
merged = append(merged, versions[0]...)
break
}
}
// Sanity check. Enable if duplicates show up.
if false {
found := make(map[[16]byte]struct{})
for _, ver := range merged {
if _, ok := found[ver.header.VersionID]; ok {
panic("found dupe")
}
found[ver.header.VersionID] = struct{}{}
}
}
return merged
}
type xlMetaBuf []byte
// ToFileInfo converts xlMetaV2 into a common FileInfo datastructure
// for consumption across callers.
func (x xlMetaBuf) ToFileInfo(volume, path, versionID string, allParts bool) (fi FileInfo, err error) {
var uv uuid.UUID
if versionID != "" && versionID != nullVersionID {
uv, err = uuid.Parse(versionID)
if err != nil {
logger.LogIf(GlobalContext, fmt.Errorf("invalid versionID specified %s", versionID))
return fi, errFileVersionNotFound
}
}
versions, headerV, metaV, buf, err := decodeXLHeaders(x)
if err != nil {
return fi, err
}
var header xlMetaV2VersionHeader
var succModTime int64
isLatest := true
nonFreeVersions := versions
found := false
err = decodeVersions(buf, versions, func(idx int, hdr, meta []byte) error {
if _, err := header.unmarshalV(headerV, hdr); err != nil {
return err
}
// skip listing free-version unless explicitly requested via versionID
if header.FreeVersion() {
nonFreeVersions--
if header.VersionID != uv {
return nil
}
}
if found {
return nil
}
// We need a specific version, skip...
if versionID != "" && uv != header.VersionID {
isLatest = false
succModTime = header.ModTime
return nil
}
// We found what we need.
found = true
var version xlMetaV2Version
if _, err := version.unmarshalV(metaV, meta); err != nil {
return err
}
if fi, err = version.ToFileInfo(volume, path, allParts); err != nil {
return err
}
fi.IsLatest = isLatest
if succModTime != 0 {
fi.SuccessorModTime = time.Unix(0, succModTime)
}
return nil
})
if !found {
if versionID == "" {
return FileInfo{}, errFileNotFound
}
return FileInfo{}, errFileVersionNotFound
}
fi.NumVersions = nonFreeVersions
return fi, err
}
// ListVersions lists current versions, and current deleted
// versions returns error for unexpected entries.
// showPendingDeletes is set to true if ListVersions needs to list objects marked deleted
// but waiting to be replicated
func (x xlMetaBuf) ListVersions(volume, path string, allParts bool) ([]FileInfo, error) {
vers, _, metaV, buf, err := decodeXLHeaders(x)
if err != nil {
return nil, err
}
var succModTime time.Time
isLatest := true
dst := make([]FileInfo, 0, vers)
var xl xlMetaV2Version
err = decodeVersions(buf, vers, func(idx int, hdr, meta []byte) error {
if _, err := xl.unmarshalV(metaV, meta); err != nil {
return err
}
if !xl.Valid() {
return errFileCorrupt
}
fi, err := xl.ToFileInfo(volume, path, allParts)
if err != nil {
return err
}
fi.IsLatest = isLatest
fi.SuccessorModTime = succModTime
fi.NumVersions = vers
isLatest = false
succModTime = xl.getModTime()
dst = append(dst, fi)
return nil
})
return dst, err
}
// IsLatestDeleteMarker returns true if latest version is a deletemarker or there are no versions.
// If any error occurs false is returned.
func (x xlMetaBuf) IsLatestDeleteMarker() bool {
vers, headerV, _, buf, err := decodeXLHeaders(x)
if err != nil {
return false
}
if vers == 0 {
return true
}
isDeleteMarker := false
_ = decodeVersions(buf, vers, func(idx int, hdr, _ []byte) error {
var xl xlMetaV2VersionHeader
if _, err := xl.unmarshalV(headerV, hdr); err != nil {
return errDoneForNow
}
isDeleteMarker = xl.Type == DeleteType
return errDoneForNow
})
return isDeleteMarker
}
// AllHidden returns true are no versions that would show up in a listing (ie all free markers)
// Optionally also return early if top is a delete marker.
func (x xlMetaBuf) AllHidden(topDeleteMarker bool) bool {
vers, headerV, _, buf, err := decodeXLHeaders(x)
if err != nil {
return false
}
if vers == 0 {
return true
}
hidden := true
var xl xlMetaV2VersionHeader
_ = decodeVersions(buf, vers, func(idx int, hdr, _ []byte) error {
if _, err := xl.unmarshalV(headerV, hdr); err != nil {
return errDoneForNow
}
if topDeleteMarker && idx == 0 && xl.Type == DeleteType {
hidden = true
return errDoneForNow
}
if !xl.FreeVersion() {
hidden = false
return errDoneForNow
}
// Check next version
return nil
})
return hidden
}
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