minio/cmd/xl-storage-format-v1.go
Harshavardhana d1a8f0b786
fix possible crashes on deleteMarker replication (#11308)
Delete marker can have `metaSys` set to nil, that
can lead to crashes after the delete marker has
been healed.

Additionally also fix isObjectDangling check
for transitioned objects, that do not have parts
should be treated similar to Delete marker.
2021-01-20 13:12:12 -08:00

213 lines
6.3 KiB
Go

/*
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"encoding/hex"
"encoding/json"
"fmt"
"time"
jsoniter "github.com/json-iterator/go"
"github.com/minio/minio/cmd/logger"
)
// XL constants.
const (
// XL metadata file carries per object metadata.
xlStorageFormatFileV1 = "xl.json"
)
// Valid - tells us if the format is sane by validating
// format version and erasure coding information.
func (m *xlMetaV1Object) valid() bool {
return isXLMetaFormatValid(m.Version, m.Format) &&
isXLMetaErasureInfoValid(m.Erasure.DataBlocks, m.Erasure.ParityBlocks)
}
// Verifies if the backend format metadata is sane by validating
// the version string and format style.
func isXLMetaFormatValid(version, format string) bool {
return ((version == xlMetaVersion101 ||
version == xlMetaVersion100) &&
format == xlMetaFormat)
}
// Verifies if the backend format metadata is sane by validating
// the ErasureInfo, i.e. data and parity blocks.
func isXLMetaErasureInfoValid(data, parity int) bool {
return ((data >= parity) && (data != 0) && (parity != 0))
}
//go:generate msgp -file=$GOFILE -unexported
// A xlMetaV1Object represents `xl.meta` metadata header.
type xlMetaV1Object struct {
Version string `json:"version"` // Version of the current `xl.meta`.
Format string `json:"format"` // Format of the current `xl.meta`.
Stat StatInfo `json:"stat"` // Stat of the current object `xl.meta`.
// Erasure coded info for the current object `xl.meta`.
Erasure ErasureInfo `json:"erasure"`
// MinIO release tag for current object `xl.meta`.
Minio struct {
Release string `json:"release"`
} `json:"minio"`
// Metadata map for current object `xl.meta`.
Meta map[string]string `json:"meta,omitempty"`
// Captures all the individual object `xl.meta`.
Parts []ObjectPartInfo `json:"parts,omitempty"`
// Dummy values used for legacy use cases.
VersionID string `json:"versionId,omitempty"`
DataDir string `json:"dataDir,omitempty"` // always points to "legacy"
}
// StatInfo - carries stat information of the object.
type StatInfo struct {
Size int64 `json:"size"` // Size of the object `xl.meta`.
ModTime time.Time `json:"modTime"` // ModTime of the object `xl.meta`.
}
// ErasureInfo holds erasure coding and bitrot related information.
type ErasureInfo struct {
// Algorithm is the string representation of erasure-coding-algorithm
Algorithm string `json:"algorithm"`
// DataBlocks is the number of data blocks for erasure-coding
DataBlocks int `json:"data"`
// ParityBlocks is the number of parity blocks for erasure-coding
ParityBlocks int `json:"parity"`
// BlockSize is the size of one erasure-coded block
BlockSize int64 `json:"blockSize"`
// Index is the index of the current disk
Index int `json:"index"`
// Distribution is the distribution of the data and parity blocks
Distribution []int `json:"distribution"`
// Checksums holds all bitrot checksums of all erasure encoded blocks
Checksums []ChecksumInfo `json:"checksum,omitempty"`
}
// BitrotAlgorithm specifies a algorithm used for bitrot protection.
type BitrotAlgorithm uint
const (
// SHA256 represents the SHA-256 hash function
SHA256 BitrotAlgorithm = 1 + iota
// HighwayHash256 represents the HighwayHash-256 hash function
HighwayHash256
// HighwayHash256S represents the Streaming HighwayHash-256 hash function
HighwayHash256S
// BLAKE2b512 represents the BLAKE2b-512 hash function
BLAKE2b512
)
// DefaultBitrotAlgorithm is the default algorithm used for bitrot protection.
const (
DefaultBitrotAlgorithm = HighwayHash256S
)
// ObjectPartInfo Info of each part kept in the multipart metadata
// file after CompleteMultipartUpload() is called.
type ObjectPartInfo struct {
ETag string `json:"etag,omitempty"`
Number int `json:"number"`
Size int64 `json:"size"`
ActualSize int64 `json:"actualSize"`
}
// ChecksumInfo - carries checksums of individual scattered parts per disk.
type ChecksumInfo struct {
PartNumber int
Algorithm BitrotAlgorithm
Hash []byte
}
type checksumInfoJSON struct {
Name string `json:"name"`
Algorithm string `json:"algorithm"`
Hash string `json:"hash,omitempty"`
}
// MarshalJSON marshals the ChecksumInfo struct
func (c ChecksumInfo) MarshalJSON() ([]byte, error) {
info := checksumInfoJSON{
Name: fmt.Sprintf("part.%d", c.PartNumber),
Algorithm: c.Algorithm.String(),
Hash: hex.EncodeToString(c.Hash),
}
return json.Marshal(info)
}
// UnmarshalJSON - custom checksum info unmarshaller
func (c *ChecksumInfo) UnmarshalJSON(data []byte) error {
var info checksumInfoJSON
var json = jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal(data, &info); err != nil {
return err
}
sum, err := hex.DecodeString(info.Hash)
if err != nil {
return err
}
c.Algorithm = BitrotAlgorithmFromString(info.Algorithm)
c.Hash = sum
if _, err = fmt.Sscanf(info.Name, "part.%d", &c.PartNumber); err != nil {
return err
}
if !c.Algorithm.Available() {
logger.LogIf(GlobalContext, errBitrotHashAlgoInvalid)
return errBitrotHashAlgoInvalid
}
return nil
}
// constant and shouldn't be changed.
const legacyDataDir = "legacy"
func (m *xlMetaV1Object) ToFileInfo(volume, path string) (FileInfo, error) {
if !m.valid() {
return FileInfo{}, errFileCorrupt
}
fi := FileInfo{
Volume: volume,
Name: path,
ModTime: m.Stat.ModTime,
Size: m.Stat.Size,
Metadata: m.Meta,
Parts: m.Parts,
Erasure: m.Erasure,
VersionID: m.VersionID,
DataDir: m.DataDir,
}
if st, ok := m.Meta[ReservedMetadataPrefixLower+"transition-status"]; ok {
fi.TransitionStatus = st
}
return fi, nil
}
// XL metadata constants.
const (
// XL meta version.
xlMetaVersion101 = "1.0.1"
// XL meta version.
xlMetaVersion100 = "1.0.0"
// XL meta format string.
xlMetaFormat = "xl"
)