It can happen so that a read request can come for a file which already has a parent i.e a file. This fix handles this scenario - fixes #2047
400 lines
11 KiB
Go
400 lines
11 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 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 main
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import (
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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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)
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const (
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// Erasure related constants.
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erasureAlgorithmKlauspost = "klauspost/reedsolomon/vandermonde"
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erasureAlgorithmISAL = "isa-l/reedsolomon/cauchy"
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)
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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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}
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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 `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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// erasureInfo - carries erasure coding related information, block
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// distribution and checksums.
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type erasureInfo struct {
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Algorithm string `json:"algorithm"`
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DataBlocks int `json:"data"`
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ParityBlocks int `json:"parity"`
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BlockSize int64 `json:"blockSize"`
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Index int `json:"index"`
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Distribution []int `json:"distribution"`
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Checksum []checkSumInfo `json:"checksum,omitempty"`
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}
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// IsValid - tells if the erasure info is sane by validating the data
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// blocks, parity blocks and distribution.
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func (e erasureInfo) IsValid() bool {
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return e.DataBlocks != 0 && e.ParityBlocks != 0 && len(e.Distribution) != 0
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}
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// pickValidErasureInfo - picks one valid erasure info content and returns, from a
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// slice of erasure info content. If no value is found this function panics
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// and dies.
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func pickValidErasureInfo(eInfos []erasureInfo) erasureInfo {
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for _, eInfo := range eInfos {
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if eInfo.IsValid() {
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return eInfo
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}
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}
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panic("Unable to look for valid erasure info content")
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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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Version int64 `json:"version"` // Version of the object `xl.json`, useful to calculate quorum.
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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"`
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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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// 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 = "1.0.0"
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xlMeta.Format = "xl"
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xlMeta.Minio.Release = minioReleaseTag
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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 and format style.
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func (m xlMetaV1) IsValid() bool {
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return m.Version == "1.0.0" && m.Format == "xl"
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}
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// ObjectPartIndex - returns the index of matching object part number.
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func (m xlMetaV1) ObjectPartIndex(partNumber int) (index int) {
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for i, part := range m.Parts {
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if partNumber == part.Number {
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index = i
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return index
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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) {
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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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}
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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(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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// 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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// pickValidXLMeta - picks one valid xlMeta content and returns from a
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// slice of xlmeta content. If no value is found this function panics
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// and dies.
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func pickValidXLMeta(xlMetas []xlMetaV1) xlMetaV1 {
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for _, xlMeta := range xlMetas {
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if xlMeta.IsValid() {
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return xlMeta
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}
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}
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panic("Unable to look for valid XL metadata content")
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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 = []error{
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errDiskNotFound,
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errDiskAccessDenied,
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errFaultyDisk,
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errVolumeNotFound,
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errFileAccessDenied,
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}
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// readXLMetadata - returns the object metadata `xl.json` content from
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// one of the disks picked at random.
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func (xl xlObjects) readXLMetadata(bucket, object string) (xlMeta xlMetaV1, err error) {
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for _, disk := range xl.getLoadBalancedQuorumDisks() {
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if disk == nil {
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continue
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}
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xlMeta, err = readXLMeta(disk, bucket, object)
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if err == nil {
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return 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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continue
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}
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break
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}
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// Return error here.
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return xlMetaV1{}, err
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}
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// Undo rename xl metadata, renames successfully renamed `xl.json` back to source location.
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func (xl xlObjects) undoRenameXLMetadata(srcBucket, srcPrefix, dstBucket, dstPrefix string, errs []error) {
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var wg = &sync.WaitGroup{}
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srcJSONFile := path.Join(srcPrefix, xlMetaJSONFile)
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dstJSONFile := path.Join(dstPrefix, xlMetaJSONFile)
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// Undo rename `xl.json` on disks where RenameFile succeeded.
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for index, disk := range xl.storageDisks {
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if disk == nil {
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continue
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}
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// Undo rename object in parallel.
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wg.Add(1)
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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if errs[index] != nil {
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return
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}
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_ = disk.RenameFile(dstBucket, dstJSONFile, srcBucket, srcJSONFile)
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}(index, disk)
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}
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wg.Wait()
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}
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// deleteXLMetadata - deletes `xl.json` on a single disk.
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func deleteXLMetdata(disk StorageAPI, bucket, prefix string) error {
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jsonFile := path.Join(prefix, xlMetaJSONFile)
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return disk.DeleteFile(bucket, jsonFile)
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}
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// writeXLMetadata - writes `xl.json` to a single disk.
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func writeXLMetadata(disk StorageAPI, bucket, prefix string, xlMeta xlMetaV1) error {
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jsonFile := path.Join(prefix, xlMetaJSONFile)
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// Marshal json.
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metadataBytes, err := json.Marshal(&xlMeta)
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if err != nil {
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return err
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}
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// Persist marshalled data.
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return disk.AppendFile(bucket, jsonFile, metadataBytes)
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}
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// deleteAllXLMetadata - deletes all partially written `xl.json` depending on errs.
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func (xl xlObjects) deleteAllXLMetadata(bucket, prefix string, errs []error) {
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var wg = &sync.WaitGroup{}
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// Delete all the `xl.json` left over.
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for index, disk := range xl.storageDisks {
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if disk == nil {
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continue
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}
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// Undo rename object in parallel.
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wg.Add(1)
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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if errs[index] != nil {
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return
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}
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_ = deleteXLMetdata(disk, bucket, prefix)
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}(index, disk)
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}
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wg.Wait()
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}
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// writeUniqueXLMetadata - writes unique `xl.json` content for each disk in order.
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func (xl xlObjects) writeUniqueXLMetadata(bucket, prefix string, xlMetas []xlMetaV1) error {
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var wg = &sync.WaitGroup{}
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var mErrs = make([]error, len(xl.storageDisks))
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// Start writing `xl.json` to all disks in parallel.
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for index, disk := range xl.storageDisks {
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if disk == nil {
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mErrs[index] = errDiskNotFound
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continue
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}
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wg.Add(1)
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// Write `xl.json` in a routine.
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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// Pick one xlMeta for a disk at index.
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xlMetas[index].Erasure.Index = index + 1
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// Write unique `xl.json` for a disk at index.
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err := writeXLMetadata(disk, bucket, prefix, xlMetas[index])
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if err != nil {
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mErrs[index] = err
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}
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}(index, disk)
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}
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// Wait for all the routines.
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wg.Wait()
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// Do we have write quorum?.
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if !isQuorum(mErrs, xl.writeQuorum) {
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// Validate if we have read quorum.
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if isQuorum(mErrs, xl.readQuorum) {
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// Return success.
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return nil
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}
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// Delete all `xl.json` successfully renamed.
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xl.deleteAllXLMetadata(bucket, prefix, mErrs)
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return errXLWriteQuorum
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}
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// For all other errors return.
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for _, err := range mErrs {
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if err != nil && err != errDiskNotFound {
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return err
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}
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}
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// Success.
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return nil
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}
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// writeSameXLMetadata - write `xl.json` on all disks in order.
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func (xl xlObjects) writeSameXLMetadata(bucket, prefix string, xlMeta xlMetaV1) error {
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var wg = &sync.WaitGroup{}
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var mErrs = make([]error, len(xl.storageDisks))
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// Start writing `xl.json` to all disks in parallel.
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for index, disk := range xl.storageDisks {
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if disk == nil {
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mErrs[index] = errDiskNotFound
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continue
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}
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wg.Add(1)
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// Write `xl.json` in a routine.
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go func(index int, disk StorageAPI, metadata xlMetaV1) {
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defer wg.Done()
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// Save the disk order index.
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metadata.Erasure.Index = index + 1
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// Write xl metadata.
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err := writeXLMetadata(disk, bucket, prefix, metadata)
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if err != nil {
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mErrs[index] = err
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}
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}(index, disk, xlMeta)
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}
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// Wait for all the routines.
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wg.Wait()
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// Do we have write Quorum?.
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if !isQuorum(mErrs, xl.writeQuorum) {
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// Do we have readQuorum?.
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if isQuorum(mErrs, xl.readQuorum) {
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// Return success.
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return nil
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}
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// Delete all `xl.json` successfully renamed.
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xl.deleteAllXLMetadata(bucket, prefix, mErrs)
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return errXLWriteQuorum
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}
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// For any other errors delete `xl.json` as well.
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for _, err := range mErrs {
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if err != nil && err != errDiskNotFound {
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return err
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}
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}
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// Success.
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return nil
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}
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