mirror of
https://github.com/minio/minio.git
synced 2024-12-25 06:35:56 -05:00
290 lines
7.8 KiB
Go
290 lines
7.8 KiB
Go
/*
|
|
* Minio Cloud Storage, (C) 2016 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 main
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"io"
|
|
"path"
|
|
"sort"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
// Erasure block size.
|
|
const erasureBlockSize = 4 * 1024 * 1024 // 4MiB.
|
|
|
|
// objectPartInfo Info of each part kept in the multipart metadata
|
|
// file after CompleteMultipartUpload() is called.
|
|
type objectPartInfo struct {
|
|
Name string `json:"name"`
|
|
ETag string `json:"etag"`
|
|
Size int64 `json:"size"`
|
|
}
|
|
|
|
// A xlMetaV1 represents a metadata header mapping keys to sets of values.
|
|
type xlMetaV1 struct {
|
|
Version string `json:"version"`
|
|
Format string `json:"format"`
|
|
Stat struct {
|
|
Size int64 `json:"size"`
|
|
ModTime time.Time `json:"modTime"`
|
|
Version int64 `json:"version"`
|
|
} `json:"stat"`
|
|
Erasure struct {
|
|
DataBlocks int `json:"data"`
|
|
ParityBlocks int `json:"parity"`
|
|
BlockSize int64 `json:"blockSize"`
|
|
Index int `json:"index"`
|
|
Distribution []int `json:"distribution"`
|
|
} `json:"erasure"`
|
|
Checksum struct {
|
|
Enable bool `json:"enable"`
|
|
} `json:"checksum"`
|
|
Minio struct {
|
|
Release string `json:"release"`
|
|
} `json:"minio"`
|
|
Meta map[string]string `json:"meta"`
|
|
Parts []objectPartInfo `json:"parts,omitempty"`
|
|
}
|
|
|
|
// ReadFrom - read from implements io.ReaderFrom interface for
|
|
// unmarshalling xlMetaV1.
|
|
func (m *xlMetaV1) ReadFrom(reader io.Reader) (n int64, err error) {
|
|
var buffer bytes.Buffer
|
|
n, err = buffer.ReadFrom(reader)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
err = json.Unmarshal(buffer.Bytes(), m)
|
|
return n, err
|
|
}
|
|
|
|
// WriteTo - write to implements io.WriterTo interface for marshalling xlMetaV1.
|
|
func (m xlMetaV1) WriteTo(writer io.Writer) (n int64, err error) {
|
|
metadataBytes, err := json.Marshal(&m)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
p, err := writer.Write(metadataBytes)
|
|
return int64(p), err
|
|
}
|
|
|
|
// byPartName is a collection satisfying sort.Interface.
|
|
type byPartName []objectPartInfo
|
|
|
|
func (t byPartName) Len() int { return len(t) }
|
|
func (t byPartName) Swap(i, j int) { t[i], t[j] = t[j], t[i] }
|
|
func (t byPartName) Less(i, j int) bool { return t[i].Name < t[j].Name }
|
|
|
|
// SearchObjectPart - searches for part name and etag, returns the
|
|
// index if found.
|
|
func (m xlMetaV1) SearchObjectPart(name string, etag string) int {
|
|
for i, part := range m.Parts {
|
|
if name == part.Name && etag == part.ETag {
|
|
return i
|
|
}
|
|
}
|
|
return -1
|
|
}
|
|
|
|
// AddObjectPart - add a new object part in order.
|
|
func (m *xlMetaV1) AddObjectPart(name string, etag string, size int64) {
|
|
m.Parts = append(m.Parts, objectPartInfo{
|
|
Name: name,
|
|
ETag: etag,
|
|
Size: size,
|
|
})
|
|
sort.Sort(byPartName(m.Parts))
|
|
}
|
|
|
|
// getPartNumberOffset - given an offset for the whole object, return the part and offset in that part.
|
|
func (m xlMetaV1) getPartNumberOffset(offset int64) (partNumber int, partOffset int64, err error) {
|
|
partOffset = offset
|
|
for i, part := range m.Parts {
|
|
partNumber = i
|
|
if part.Size == 0 {
|
|
return partNumber, partOffset, nil
|
|
}
|
|
if partOffset < part.Size {
|
|
return partNumber, partOffset, nil
|
|
}
|
|
partOffset -= part.Size
|
|
}
|
|
// Offset beyond the size of the object
|
|
err = errUnexpected
|
|
return 0, 0, err
|
|
}
|
|
|
|
// This function does the following check, suppose
|
|
// object is "a/b/c/d", stat makes sure that objects ""a/b/c""
|
|
// "a/b" and "a" do not exist.
|
|
func (xl xlObjects) parentDirIsObject(bucket, parent string) bool {
|
|
var isParentDirObject func(string) bool
|
|
isParentDirObject = func(p string) bool {
|
|
if p == "." {
|
|
return false
|
|
}
|
|
if xl.isObject(bucket, p) {
|
|
// If there is already a file at prefix "p" return error.
|
|
return true
|
|
}
|
|
// Check if there is a file as one of the parent paths.
|
|
return isParentDirObject(path.Dir(p))
|
|
}
|
|
return isParentDirObject(parent)
|
|
}
|
|
|
|
func (xl xlObjects) isObject(bucket, prefix string) bool {
|
|
// Create errs and volInfo slices of storageDisks size.
|
|
var errs = make([]error, len(xl.storageDisks))
|
|
|
|
// Allocate a new waitgroup.
|
|
var wg = &sync.WaitGroup{}
|
|
for index, disk := range xl.storageDisks {
|
|
wg.Add(1)
|
|
// Stat file on all the disks in a routine.
|
|
go func(index int, disk StorageAPI) {
|
|
defer wg.Done()
|
|
_, err := disk.StatFile(bucket, path.Join(prefix, xlMetaJSONFile))
|
|
if err != nil {
|
|
errs[index] = err
|
|
return
|
|
}
|
|
errs[index] = nil
|
|
}(index, disk)
|
|
}
|
|
|
|
// Wait for all the Stat operations to finish.
|
|
wg.Wait()
|
|
|
|
var errFileNotFoundCount int
|
|
for _, err := range errs {
|
|
if err != nil {
|
|
if err == errFileNotFound {
|
|
errFileNotFoundCount++
|
|
// If we have errors with file not found greater than allowed read
|
|
// quorum we return err as errFileNotFound.
|
|
if errFileNotFoundCount > len(xl.storageDisks)-xl.readQuorum {
|
|
return false
|
|
}
|
|
continue
|
|
}
|
|
errorIf(err, "Unable to access file "+path.Join(bucket, prefix))
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// readXLMetadata - read xl metadata.
|
|
func readXLMetadata(disk StorageAPI, bucket, object string) (xlMeta xlMetaV1, err error) {
|
|
r, err := disk.ReadFile(bucket, path.Join(object, xlMetaJSONFile), int64(0))
|
|
if err != nil {
|
|
return xlMetaV1{}, err
|
|
}
|
|
defer r.Close()
|
|
_, err = xlMeta.ReadFrom(r)
|
|
if err != nil {
|
|
return xlMetaV1{}, err
|
|
}
|
|
return xlMeta, nil
|
|
}
|
|
|
|
// deleteXLJson - delete `xl.json` on all disks.
|
|
func (xl xlObjects) deleteXLMetadata(bucket, object string) error {
|
|
return xl.deleteObject(bucket, path.Join(object, xlMetaJSONFile))
|
|
}
|
|
|
|
// renameXLJson - rename `xl.json` on all disks.
|
|
func (xl xlObjects) renameXLMetadata(srcBucket, srcPrefix, dstBucket, dstPrefix string) error {
|
|
return xl.renameObject(srcBucket, path.Join(srcPrefix, xlMetaJSONFile), dstBucket, path.Join(dstPrefix, xlMetaJSONFile))
|
|
}
|
|
|
|
// getDiskDistribution - get disk distribution.
|
|
func (xl xlObjects) getDiskDistribution() []int {
|
|
var distribution = make([]int, len(xl.storageDisks))
|
|
for index := range xl.storageDisks {
|
|
distribution[index] = index + 1
|
|
}
|
|
return distribution
|
|
}
|
|
|
|
// writeXLJson - write `xl.json` on all disks in order.
|
|
func (xl xlObjects) writeXLMetadata(bucket, prefix string, xlMeta xlMetaV1) error {
|
|
var wg = &sync.WaitGroup{}
|
|
var mErrs = make([]error, len(xl.storageDisks))
|
|
|
|
// Initialize metadata map, save all erasure related metadata.
|
|
xlMeta.Version = "1"
|
|
xlMeta.Format = "xl"
|
|
xlMeta.Minio.Release = minioReleaseTag
|
|
xlMeta.Erasure.DataBlocks = xl.dataBlocks
|
|
xlMeta.Erasure.ParityBlocks = xl.parityBlocks
|
|
xlMeta.Erasure.BlockSize = erasureBlockSize
|
|
xlMeta.Erasure.Distribution = xl.getDiskDistribution()
|
|
|
|
for index, disk := range xl.storageDisks {
|
|
wg.Add(1)
|
|
go func(index int, disk StorageAPI, metadata xlMetaV1) {
|
|
defer wg.Done()
|
|
|
|
metaJSONFile := path.Join(prefix, xlMetaJSONFile)
|
|
metaWriter, mErr := disk.CreateFile(bucket, metaJSONFile)
|
|
if mErr != nil {
|
|
mErrs[index] = mErr
|
|
return
|
|
}
|
|
|
|
// Save the order.
|
|
metadata.Erasure.Index = index + 1
|
|
_, mErr = metadata.WriteTo(metaWriter)
|
|
if mErr != nil {
|
|
if mErr = safeCloseAndRemove(metaWriter); mErr != nil {
|
|
mErrs[index] = mErr
|
|
return
|
|
}
|
|
mErrs[index] = mErr
|
|
return
|
|
}
|
|
if mErr = metaWriter.Close(); mErr != nil {
|
|
if mErr = safeCloseAndRemove(metaWriter); mErr != nil {
|
|
mErrs[index] = mErr
|
|
return
|
|
}
|
|
mErrs[index] = mErr
|
|
return
|
|
}
|
|
mErrs[index] = nil
|
|
}(index, disk, xlMeta)
|
|
}
|
|
|
|
// Wait for all the routines.
|
|
wg.Wait()
|
|
|
|
// FIXME: check for quorum.
|
|
// Loop through concocted errors and return the first one.
|
|
for _, err := range mErrs {
|
|
if err == nil {
|
|
continue
|
|
}
|
|
return err
|
|
}
|
|
return nil
|
|
}
|