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/*
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* Minio Cloud Storage, (C) 2016, 2017, 2017 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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"context"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"path"
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"sort"
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"sync"
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"time"
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"github.com/minio/minio/cmd/logger"
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)
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const erasureAlgorithmKlauspost = "klauspost/reedsolomon/vandermonde"
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// objectPartInfo Info of each part kept in the multipart metadata
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// file after CompleteMultipartUpload() is called.
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type objectPartInfo struct {
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Number int `json:"number"`
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Name string `json:"name"`
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ETag string `json:"etag"`
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Size int64 `json:"size"`
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ActualSize int64 `json:"actualSize"`
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}
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// byObjectPartNumber is a collection satisfying sort.Interface.
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type byObjectPartNumber []objectPartInfo
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func (t byObjectPartNumber) Len() int { return len(t) }
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func (t byObjectPartNumber) Swap(i, j int) { t[i], t[j] = t[j], t[i] }
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func (t byObjectPartNumber) Less(i, j int) bool { return t[i].Number < t[j].Number }
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// ChecksumInfo - carries checksums of individual scattered parts per disk.
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type ChecksumInfo struct {
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Name string
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Algorithm BitrotAlgorithm
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Hash []byte
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}
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type checksumInfoJSON struct {
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Name string `json:"name"`
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Algorithm string `json:"algorithm"`
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Hash string `json:"hash"`
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}
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// MarshalJSON marshals the ChecksumInfo struct
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func (c ChecksumInfo) MarshalJSON() ([]byte, error) {
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info := checksumInfoJSON{
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Name: c.Name,
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Algorithm: c.Algorithm.String(),
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Hash: hex.EncodeToString(c.Hash),
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}
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return json.Marshal(info)
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}
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// UnmarshalJSON - should never be called, instead xlMetaV1UnmarshalJSON() should be used.
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func (c *ChecksumInfo) UnmarshalJSON(data []byte) error {
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logger.LogIf(context.Background(), errUnexpected)
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var info checksumInfoJSON
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if err := json.Unmarshal(data, &info); err != nil {
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return err
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}
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sum, err := hex.DecodeString(info.Hash)
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if err != nil {
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return err
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}
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c.Name = info.Name
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c.Algorithm = BitrotAlgorithmFromString(info.Algorithm)
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c.Hash = sum
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if !c.Algorithm.Available() {
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logger.LogIf(context.Background(), errBitrotHashAlgoInvalid)
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return errBitrotHashAlgoInvalid
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}
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return nil
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}
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// ErasureInfo holds erasure coding and bitrot related information.
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type ErasureInfo struct {
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// Algorithm is the string representation of erasure-coding-algorithm
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Algorithm string `json:"algorithm"`
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// DataBlocks is the number of data blocks for erasure-coding
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DataBlocks int `json:"data"`
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// ParityBlocks is the number of parity blocks for erasure-coding
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ParityBlocks int `json:"parity"`
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// BlockSize is the size of one erasure-coded block
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BlockSize int64 `json:"blockSize"`
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// Index is the index of the current disk
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Index int `json:"index"`
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// Distribution is the distribution of the data and parity blocks
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Distribution []int `json:"distribution"`
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// Checksums holds all bitrot checksums of all erasure encoded blocks
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Checksums []ChecksumInfo `json:"checksum,omitempty"`
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}
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// AddChecksumInfo adds a checksum of a part.
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func (e *ErasureInfo) AddChecksumInfo(ckSumInfo ChecksumInfo) {
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for i, sum := range e.Checksums {
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if sum.Name == ckSumInfo.Name {
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e.Checksums[i] = ckSumInfo
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return
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}
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}
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e.Checksums = append(e.Checksums, ckSumInfo)
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}
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// GetChecksumInfo - get checksum of a part.
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func (e ErasureInfo) GetChecksumInfo(partName string) (ckSum ChecksumInfo) {
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// Return the checksum.
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for _, sum := range e.Checksums {
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if sum.Name == partName {
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return sum
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}
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}
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return ChecksumInfo{}
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}
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// statInfo - carries stat information of the object.
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type statInfo struct {
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Size int64 `json:"size"` // Size of the object `xl.json`.
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ModTime time.Time `json:"modTime"` // ModTime of the object `xl.json`.
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}
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// A xlMetaV1 represents `xl.json` metadata header.
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type xlMetaV1 struct {
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Version string `json:"version"` // Version of the current `xl.json`.
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Format string `json:"format"` // Format of the current `xl.json`.
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Stat statInfo `json:"stat"` // Stat of the current object `xl.json`.
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// Erasure coded info for the current object `xl.json`.
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Erasure ErasureInfo `json:"erasure"`
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// Minio release tag for current object `xl.json`.
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Minio struct {
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Release string `json:"release"`
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} `json:"minio"`
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// Metadata map for current object `xl.json`.
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Meta map[string]string `json:"meta,omitempty"`
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// Captures all the individual object `xl.json`.
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Parts []objectPartInfo `json:"parts,omitempty"`
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}
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// XL metadata constants.
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const (
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// XL meta version.
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xlMetaVersion = "1.0.1"
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// XL meta version.
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xlMetaVersion100 = "1.0.0"
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// XL meta format string.
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xlMetaFormat = "xl"
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// Add new constants here.
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)
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// newXLMetaV1 - initializes new xlMetaV1, adds version, allocates a fresh erasure info.
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func newXLMetaV1(object string, dataBlocks, parityBlocks int) (xlMeta xlMetaV1) {
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xlMeta = xlMetaV1{}
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xlMeta.Version = xlMetaVersion
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xlMeta.Format = xlMetaFormat
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xlMeta.Minio.Release = ReleaseTag
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xlMeta.Erasure = ErasureInfo{
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Algorithm: erasureAlgorithmKlauspost,
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DataBlocks: dataBlocks,
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ParityBlocks: parityBlocks,
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BlockSize: blockSizeV1,
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Distribution: hashOrder(object, dataBlocks+parityBlocks),
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}
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return xlMeta
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}
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// IsValid - tells if the format is sane by validating the version
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// string, format and erasure info fields.
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func (m xlMetaV1) IsValid() bool {
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return isXLMetaFormatValid(m.Version, m.Format) &&
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isXLMetaErasureInfoValid(m.Erasure.DataBlocks, m.Erasure.ParityBlocks)
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}
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// Verifies if the backend format metadata is sane by validating
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// the version string and format style.
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func isXLMetaFormatValid(version, format string) bool {
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return ((version == xlMetaVersion || version == xlMetaVersion100) &&
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format == xlMetaFormat)
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}
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// Verifies if the backend format metadata is sane by validating
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// the ErasureInfo, i.e. data and parity blocks.
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func isXLMetaErasureInfoValid(data, parity int) bool {
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return ((data >= parity) && (data != 0) && (parity != 0))
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}
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// Converts metadata to object info.
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func (m xlMetaV1) ToObjectInfo(bucket, object string) ObjectInfo {
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objInfo := ObjectInfo{
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IsDir: false,
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Bucket: bucket,
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Name: object,
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Size: m.Stat.Size,
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ModTime: m.Stat.ModTime,
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ContentType: m.Meta["content-type"],
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ContentEncoding: m.Meta["content-encoding"],
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}
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// Extract etag from metadata.
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objInfo.ETag = extractETag(m.Meta)
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// etag/md5Sum has already been extracted. We need to
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// remove to avoid it from appearing as part of
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// response headers. e.g, X-Minio-* or X-Amz-*.
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objInfo.UserDefined = cleanMetadata(m.Meta)
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// All the parts per object.
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objInfo.Parts = m.Parts
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// Update storage class
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if sc, ok := m.Meta[amzStorageClass]; ok {
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objInfo.StorageClass = sc
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} else {
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objInfo.StorageClass = globalMinioDefaultStorageClass
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}
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// Success.
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return objInfo
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}
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// objectPartIndex - returns the index of matching object part number.
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func objectPartIndex(parts []objectPartInfo, partNumber int) int {
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for i, part := range parts {
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if partNumber == part.Number {
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return i
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}
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}
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return -1
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}
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// AddObjectPart - add a new object part in order.
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func (m *xlMetaV1) AddObjectPart(partNumber int, partName string, partETag string, partSize int64, actualSize int64) {
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partInfo := objectPartInfo{
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Number: partNumber,
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Name: partName,
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ETag: partETag,
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Size: partSize,
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ActualSize: actualSize,
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}
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// Update part info if it already exists.
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for i, part := range m.Parts {
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if partNumber == part.Number {
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m.Parts[i] = partInfo
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return
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}
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}
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// Proceed to include new part info.
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m.Parts = append(m.Parts, partInfo)
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// Parts in xlMeta should be in sorted order by part number.
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sort.Sort(byObjectPartNumber(m.Parts))
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}
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// ObjectToPartOffset - translate offset of an object to offset of its individual part.
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func (m xlMetaV1) ObjectToPartOffset(ctx context.Context, offset int64) (partIndex int, partOffset int64, err error) {
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if offset == 0 {
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// Special case - if offset is 0, then partIndex and partOffset are always 0.
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return 0, 0, nil
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}
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partOffset = offset
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// Seek until object offset maps to a particular part offset.
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for i, part := range m.Parts {
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partIndex = i
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// Offset is smaller than size we have reached the proper part offset.
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if partOffset < part.Size {
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return partIndex, partOffset, nil
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}
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// Continue to towards the next part.
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partOffset -= part.Size
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}
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logger.LogIf(ctx, InvalidRange{})
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// Offset beyond the size of the object return InvalidRange.
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return 0, 0, InvalidRange{}
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}
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func getXLMetaInQuorum(ctx context.Context, metaArr []xlMetaV1, modTime time.Time, quorum int) (xmv xlMetaV1, e error) {
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metaHashes := make([]string, len(metaArr))
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for i, meta := range metaArr {
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if meta.IsValid() && meta.Stat.ModTime.Equal(modTime) {
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h := sha256.New()
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for _, p := range meta.Parts {
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h.Write([]byte(p.Name))
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}
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metaHashes[i] = hex.EncodeToString(h.Sum(nil))
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}
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}
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metaHashCountMap := make(map[string]int)
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for _, hash := range metaHashes {
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if hash == "" {
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continue
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}
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metaHashCountMap[hash]++
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}
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maxHash := ""
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maxCount := 0
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for hash, count := range metaHashCountMap {
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if count > maxCount {
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maxCount = count
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maxHash = hash
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}
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}
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if maxCount < quorum {
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return xlMetaV1{}, errXLReadQuorum
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}
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for i, hash := range metaHashes {
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if hash == maxHash {
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return metaArr[i], nil
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}
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}
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return xlMetaV1{}, errXLReadQuorum
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}
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// pickValidXLMeta - picks one valid xlMeta content and returns from a
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// slice of xlmeta content.
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func pickValidXLMeta(ctx context.Context, metaArr []xlMetaV1, modTime time.Time, quorum int) (xmv xlMetaV1, e error) {
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return getXLMetaInQuorum(ctx, metaArr, modTime, quorum)
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}
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// list of all errors that can be ignored in a metadata operation.
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var objMetadataOpIgnoredErrs = append(baseIgnoredErrs, errDiskAccessDenied, errVolumeNotFound, errFileNotFound, errFileAccessDenied, errCorruptedFormat)
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// readXLMetaParts - returns the XL Metadata Parts from xl.json of one of the disks picked at random.
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func (xl xlObjects) readXLMetaParts(ctx context.Context, bucket, object string) (xlMetaParts []objectPartInfo, xlMeta map[string]string, err error) {
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var ignoredErrs []error
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for _, disk := range xl.getLoadBalancedDisks() {
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if disk == nil {
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ignoredErrs = append(ignoredErrs, errDiskNotFound)
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continue
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}
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xlMetaParts, xlMeta, err = readXLMetaParts(ctx, disk, bucket, object)
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if err == nil {
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return xlMetaParts, xlMeta, nil
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}
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// For any reason disk or bucket is not available continue
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// and read from other disks.
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if IsErrIgnored(err, objMetadataOpIgnoredErrs...) {
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ignoredErrs = append(ignoredErrs, err)
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continue
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}
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// Error is not ignored, return right here.
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return nil, nil, err
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}
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// If all errors were ignored, reduce to maximal occurrence
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// based on the read quorum.
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readQuorum := len(xl.getDisks()) / 2
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|
return nil, nil, reduceReadQuorumErrs(ctx, ignoredErrs, nil, readQuorum)
|
|
|
|
}
|
|
|
|
|
|
|
|
// readXLMetaStat - return xlMetaV1.Stat and xlMetaV1.Meta from one of the disks picked at random.
|
|
|
|
func (xl xlObjects) readXLMetaStat(ctx context.Context, bucket, object string) (xlStat statInfo, xlMeta map[string]string, err error) {
|
|
|
|
var ignoredErrs []error
|
|
|
|
for _, disk := range xl.getLoadBalancedDisks() {
|
|
|
|
if disk == nil {
|
|
|
|
ignoredErrs = append(ignoredErrs, errDiskNotFound)
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
// parses only xlMetaV1.Meta and xlMeta.Stat
|
|
|
|
xlStat, xlMeta, err = readXLMetaStat(ctx, disk, bucket, object)
|
|
|
|
if err == nil {
|
|
|
|
return xlStat, xlMeta, nil
|
|
|
|
}
|
|
|
|
// For any reason disk or bucket is not available continue
|
|
|
|
// and read from other disks.
|
|
|
|
if IsErrIgnored(err, objMetadataOpIgnoredErrs...) {
|
|
|
|
ignoredErrs = append(ignoredErrs, err)
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
// Error is not ignored, return right here.
|
|
|
|
return statInfo{}, nil, err
|
|
|
|
}
|
|
|
|
// If all errors were ignored, reduce to maximal occurrence
|
|
|
|
// based on the read quorum.
|
|
|
|
readQuorum := len(xl.getDisks()) / 2
|
|
|
|
return statInfo{}, nil, reduceReadQuorumErrs(ctx, ignoredErrs, nil, readQuorum)
|
|
|
|
}
|
|
|
|
|
|
|
|
// deleteXLMetadata - deletes `xl.json` on a single disk.
|
|
|
|
func deleteXLMetdata(ctx context.Context, disk StorageAPI, bucket, prefix string) error {
|
|
|
|
jsonFile := path.Join(prefix, xlMetaJSONFile)
|
|
|
|
err := disk.DeleteFile(bucket, jsonFile)
|
|
|
|
logger.LogIf(ctx, err)
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
|
|
|
|
// writeXLMetadata - writes `xl.json` to a single disk.
|
|
|
|
func writeXLMetadata(ctx context.Context, disk StorageAPI, bucket, prefix string, xlMeta xlMetaV1) error {
|
|
|
|
jsonFile := path.Join(prefix, xlMetaJSONFile)
|
|
|
|
|
|
|
|
// Marshal json.
|
|
|
|
metadataBytes, err := json.Marshal(&xlMeta)
|
|
|
|
if err != nil {
|
|
|
|
logger.LogIf(ctx, err)
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
// Persist marshaled data.
|
|
|
|
err = disk.AppendFile(bucket, jsonFile, metadataBytes)
|
|
|
|
logger.LogIf(ctx, err)
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
|
|
|
|
// deleteAllXLMetadata - deletes all partially written `xl.json` depending on errs.
|
|
|
|
func deleteAllXLMetadata(ctx context.Context, disks []StorageAPI, bucket, prefix string, errs []error) {
|
|
|
|
var wg = &sync.WaitGroup{}
|
|
|
|
// Delete all the `xl.json` left over.
|
|
|
|
for index, disk := range disks {
|
|
|
|
if disk == nil {
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
// Undo rename object in parallel.
|
|
|
|
wg.Add(1)
|
|
|
|
go func(index int, disk StorageAPI) {
|
|
|
|
defer wg.Done()
|
|
|
|
if errs[index] != nil {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
_ = deleteXLMetdata(ctx, disk, bucket, prefix)
|
|
|
|
}(index, disk)
|
|
|
|
}
|
|
|
|
wg.Wait()
|
|
|
|
}
|
|
|
|
|
|
|
|
// Rename `xl.json` content to destination location for each disk in order.
|
|
|
|
func renameXLMetadata(ctx context.Context, disks []StorageAPI, srcBucket, srcEntry, dstBucket, dstEntry string, quorum int) ([]StorageAPI, error) {
|
|
|
|
isDir := false
|
|
|
|
srcXLJSON := path.Join(srcEntry, xlMetaJSONFile)
|
|
|
|
dstXLJSON := path.Join(dstEntry, xlMetaJSONFile)
|
|
|
|
return rename(ctx, disks, srcBucket, srcXLJSON, dstBucket, dstXLJSON, isDir, quorum, []error{errFileNotFound})
|
|
|
|
}
|
|
|
|
|
|
|
|
// writeUniqueXLMetadata - writes unique `xl.json` content for each disk in order.
|
|
|
|
func writeUniqueXLMetadata(ctx context.Context, disks []StorageAPI, bucket, prefix string, xlMetas []xlMetaV1, quorum int) ([]StorageAPI, error) {
|
|
|
|
var wg = &sync.WaitGroup{}
|
|
|
|
var mErrs = make([]error, len(disks))
|
|
|
|
|
|
|
|
// Start writing `xl.json` to all disks in parallel.
|
|
|
|
for index, disk := range disks {
|
|
|
|
if disk == nil {
|
|
|
|
mErrs[index] = errDiskNotFound
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
wg.Add(1)
|
|
|
|
// Write `xl.json` in a routine.
|
|
|
|
go func(index int, disk StorageAPI) {
|
|
|
|
defer wg.Done()
|
|
|
|
|
|
|
|
// Pick one xlMeta for a disk at index.
|
|
|
|
xlMetas[index].Erasure.Index = index + 1
|
|
|
|
|
|
|
|
// Write unique `xl.json` for a disk at index.
|
|
|
|
err := writeXLMetadata(ctx, disk, bucket, prefix, xlMetas[index])
|
|
|
|
if err != nil {
|
|
|
|
mErrs[index] = err
|
|
|
|
}
|
|
|
|
}(index, disk)
|
|
|
|
}
|
|
|
|
|
|
|
|
// Wait for all the routines.
|
|
|
|
wg.Wait()
|
|
|
|
|
|
|
|
err := reduceWriteQuorumErrs(ctx, mErrs, objectOpIgnoredErrs, quorum)
|
|
|
|
if err == errXLWriteQuorum {
|
|
|
|
// Delete all `xl.json` successfully renamed.
|
|
|
|
deleteAllXLMetadata(ctx, disks, bucket, prefix, mErrs)
|
|
|
|
}
|
|
|
|
return evalDisks(disks, mErrs), err
|
|
|
|
}
|
|
|
|
|
|
|
|
// writeSameXLMetadata - write `xl.json` on all disks in order.
|
|
|
|
func writeSameXLMetadata(ctx context.Context, disks []StorageAPI, bucket, prefix string, xlMeta xlMetaV1, writeQuorum int) ([]StorageAPI, error) {
|
|
|
|
var wg = &sync.WaitGroup{}
|
|
|
|
var mErrs = make([]error, len(disks))
|
|
|
|
|
|
|
|
// Start writing `xl.json` to all disks in parallel.
|
|
|
|
for index, disk := range disks {
|
|
|
|
if disk == nil {
|
|
|
|
mErrs[index] = errDiskNotFound
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
wg.Add(1)
|
|
|
|
// Write `xl.json` in a routine.
|
|
|
|
go func(index int, disk StorageAPI, metadata xlMetaV1) {
|
|
|
|
defer wg.Done()
|
|
|
|
|
|
|
|
// Save the disk order index.
|
|
|
|
metadata.Erasure.Index = index + 1
|
|
|
|
|
|
|
|
// Write xl metadata.
|
|
|
|
err := writeXLMetadata(ctx, disk, bucket, prefix, metadata)
|
|
|
|
if err != nil {
|
|
|
|
mErrs[index] = err
|
|
|
|
}
|
|
|
|
}(index, disk, xlMeta)
|
|
|
|
}
|
|
|
|
|
|
|
|
// Wait for all the routines.
|
|
|
|
wg.Wait()
|
|
|
|
|
|
|
|
err := reduceWriteQuorumErrs(ctx, mErrs, objectOpIgnoredErrs, writeQuorum)
|
|
|
|
if err == errXLWriteQuorum {
|
|
|
|
// Delete all `xl.json` successfully renamed.
|
|
|
|
deleteAllXLMetadata(ctx, disks, bucket, prefix, mErrs)
|
|
|
|
}
|
|
|
|
return evalDisks(disks, mErrs), err
|
|
|
|
}
|