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minio/fs-v1-multipart.go

662 lines
22 KiB

/*
* 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 (
"crypto/md5"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"path"
"strconv"
"strings"
"time"
"github.com/skyrings/skyring-common/tools/uuid"
)
// Checks whether bucket exists.
func (fs fsObjects) isBucketExist(bucket string) bool {
// Check whether bucket exists.
_, err := fs.storage.StatVol(bucket)
if err != nil {
if err == errVolumeNotFound {
return false
}
errorIf(err, "Stat failed on bucket "+bucket+".")
return false
}
return true
}
// newMultipartUploadCommon - initialize a new multipart, is a common function for both object layers.
func (fs fsObjects) newMultipartUploadCommon(bucket string, object string, meta map[string]string) (uploadID string, err error) {
// Verify if bucket name is valid.
if !IsValidBucketName(bucket) {
return "", BucketNameInvalid{Bucket: bucket}
}
// Verify whether the bucket exists.
if !fs.isBucketExist(bucket) {
return "", BucketNotFound{Bucket: bucket}
}
// Verify if object name is valid.
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{Bucket: bucket, Object: object}
}
// No metadata is set, allocate a new one.
if meta == nil {
meta = make(map[string]string)
}
fsMeta := fsMetaV1{}
fsMeta.Format = "fs"
fsMeta.Version = "1"
// This lock needs to be held for any changes to the directory contents of ".minio/multipart/object/"
nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object))
defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object))
uploadID = getUUID()
initiated := time.Now().UTC()
// Create 'uploads.json'
if err = writeUploadJSON(bucket, object, uploadID, initiated, fs.storage); err != nil {
return "", err
}
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
tempUploadIDPath := path.Join(tmpMetaPrefix, bucket, object, uploadID)
if err = fs.writeFSMetadata(minioMetaBucket, tempUploadIDPath, fsMeta); err != nil {
return "", toObjectErr(err, minioMetaBucket, tempUploadIDPath)
}
err = fs.storage.RenameFile(minioMetaBucket, path.Join(tempUploadIDPath, fsMetaJSONFile), minioMetaBucket, path.Join(uploadIDPath, fsMetaJSONFile))
if err != nil {
if dErr := fs.storage.DeleteFile(minioMetaBucket, path.Join(tempUploadIDPath, fsMetaJSONFile)); dErr != nil {
return "", toObjectErr(dErr, minioMetaBucket, tempUploadIDPath)
}
return "", toObjectErr(err, minioMetaBucket, uploadIDPath)
}
// Return success.
return uploadID, nil
}
func isMultipartObject(storage StorageAPI, bucket, prefix string) bool {
_, err := storage.StatFile(bucket, path.Join(prefix, fsMetaJSONFile))
if err != nil {
if err == errFileNotFound {
return false
}
errorIf(err, "Unable to access "+path.Join(prefix, fsMetaJSONFile))
return false
}
return true
}
// listUploadsInfo - list all uploads info.
func (fs fsObjects) listUploadsInfo(prefixPath string) (uploads []uploadInfo, err error) {
splitPrefixes := strings.SplitN(prefixPath, "/", 3)
uploadIDs, err := getUploadIDs(splitPrefixes[1], splitPrefixes[2], fs.storage)
if err != nil {
if err == errFileNotFound {
return []uploadInfo{}, nil
}
return nil, err
}
uploads = uploadIDs.Uploads
return uploads, nil
}
// listMetaBucketMultipart - list all objects at a given prefix inside minioMetaBucket.
func (fs fsObjects) listMetaBucketMultipart(prefixPath string, markerPath string, recursive bool, maxKeys int) (fileInfos []FileInfo, eof bool, err error) {
walker := fs.lookupTreeWalk(listParams{minioMetaBucket, recursive, markerPath, prefixPath})
if walker == nil {
walker = fs.startTreeWalk(minioMetaBucket, prefixPath, markerPath, recursive)
}
// newMaxKeys tracks the size of entries which are going to be
// returned back.
var newMaxKeys int
// Following loop gathers and filters out special files inside
// minio meta volume.
for {
walkResult, ok := <-walker.ch
if !ok {
// Closed channel.
eof = true
break
}
// For any walk error return right away.
if walkResult.err != nil {
// File not found or Disk not found is a valid case.
if walkResult.err == errFileNotFound || walkResult.err == errDiskNotFound {
return nil, true, nil
}
return nil, false, toObjectErr(walkResult.err, minioMetaBucket, prefixPath)
}
fileInfo := walkResult.fileInfo
var uploads []uploadInfo
if fileInfo.Mode.IsDir() {
// List all the entries if fi.Name is a leaf directory, if
// fi.Name is not a leaf directory then the resulting
// entries are empty.
uploads, err = fs.listUploadsInfo(fileInfo.Name)
if err != nil {
return nil, false, err
}
}
if len(uploads) > 0 {
for _, upload := range uploads {
fileInfos = append(fileInfos, FileInfo{
Name: path.Join(fileInfo.Name, upload.UploadID),
ModTime: upload.Initiated,
})
newMaxKeys++
// If we have reached the maxKeys, it means we have listed
// everything that was requested.
if newMaxKeys == maxKeys {
break
}
}
} else {
// We reach here for a non-recursive case non-leaf entry
// OR recursive case with fi.Name.
if !fileInfo.Mode.IsDir() { // Do not skip non-recursive case directory entries.
// Validate if 'fi.Name' is incomplete multipart.
if !strings.HasSuffix(fileInfo.Name, fsMetaJSONFile) {
continue
}
fileInfo.Name = path.Dir(fileInfo.Name)
}
fileInfos = append(fileInfos, fileInfo)
newMaxKeys++
// If we have reached the maxKeys, it means we have listed
// everything that was requested.
if newMaxKeys == maxKeys {
break
}
}
}
if !eof && len(fileInfos) != 0 {
// EOF has not reached, hence save the walker channel to the map so that the walker go routine
// can continue from where it left off for the next list request.
lastFileInfo := fileInfos[len(fileInfos)-1]
markerPath = lastFileInfo.Name
fs.saveTreeWalk(listParams{minioMetaBucket, recursive, markerPath, prefixPath}, walker)
}
// Return entries here.
return fileInfos, eof, nil
}
// FIXME: Currently the code sorts based on keyName/upload-id which is
// not correct based on the S3 specs. According to s3 specs we are
// supposed to only lexically sort keyNames and then for keyNames with
// multiple upload ids should be sorted based on the initiated time.
// Currently this case is not handled.
// listMultipartUploadsCommon - lists all multipart uploads, common function for both object layers.
func (fs fsObjects) listMultipartUploadsCommon(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
result := ListMultipartsInfo{}
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return ListMultipartsInfo{}, BucketNameInvalid{Bucket: bucket}
}
if !fs.isBucketExist(bucket) {
return ListMultipartsInfo{}, BucketNotFound{Bucket: bucket}
}
if !IsValidObjectPrefix(prefix) {
return ListMultipartsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: prefix}
}
// Verify if delimiter is anything other than '/', which we do not support.
if delimiter != "" && delimiter != slashSeparator {
return ListMultipartsInfo{}, UnsupportedDelimiter{
Delimiter: delimiter,
}
}
// Verify if marker has prefix.
if keyMarker != "" && !strings.HasPrefix(keyMarker, prefix) {
return ListMultipartsInfo{}, InvalidMarkerPrefixCombination{
Marker: keyMarker,
Prefix: prefix,
}
}
if uploadIDMarker != "" {
if strings.HasSuffix(keyMarker, slashSeparator) {
return result, InvalidUploadIDKeyCombination{
UploadIDMarker: uploadIDMarker,
KeyMarker: keyMarker,
}
}
id, err := uuid.Parse(uploadIDMarker)
if err != nil {
return result, err
}
if id.IsZero() {
return result, MalformedUploadID{
UploadID: uploadIDMarker,
}
}
}
recursive := true
if delimiter == slashSeparator {
recursive = false
}
result.IsTruncated = true
result.MaxUploads = maxUploads
// Not using path.Join() as it strips off the trailing '/'.
multipartPrefixPath := pathJoin(mpartMetaPrefix, pathJoin(bucket, prefix))
if prefix == "" {
// Should have a trailing "/" if prefix is ""
// For ex. multipartPrefixPath should be "multipart/bucket/" if prefix is ""
multipartPrefixPath += slashSeparator
}
multipartMarkerPath := ""
if keyMarker != "" {
keyMarkerPath := pathJoin(pathJoin(bucket, keyMarker), uploadIDMarker)
multipartMarkerPath = pathJoin(mpartMetaPrefix, keyMarkerPath)
}
// List all the multipart files at prefixPath, starting with marker keyMarkerPath.
fileInfos, eof, err := fs.listMetaBucketMultipart(multipartPrefixPath, multipartMarkerPath, recursive, maxUploads)
if err != nil {
return ListMultipartsInfo{}, err
}
// Loop through all the received files fill in the multiparts result.
for _, fileInfo := range fileInfos {
var objectName string
var uploadID string
if fileInfo.Mode.IsDir() {
// All directory entries are common prefixes.
uploadID = "" // Upload ids are empty for CommonPrefixes.
objectName = strings.TrimPrefix(fileInfo.Name, retainSlash(pathJoin(mpartMetaPrefix, bucket)))
result.CommonPrefixes = append(result.CommonPrefixes, objectName)
} else {
uploadID = path.Base(fileInfo.Name)
objectName = strings.TrimPrefix(path.Dir(fileInfo.Name), retainSlash(pathJoin(mpartMetaPrefix, bucket)))
result.Uploads = append(result.Uploads, uploadMetadata{
Object: objectName,
UploadID: uploadID,
Initiated: fileInfo.ModTime,
})
}
result.NextKeyMarker = objectName
result.NextUploadIDMarker = uploadID
}
result.IsTruncated = !eof
if !result.IsTruncated {
result.NextKeyMarker = ""
result.NextUploadIDMarker = ""
}
return result, nil
}
// ListMultipartUploads - list multipart uploads.
func (fs fsObjects) ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
return fs.listMultipartUploadsCommon(bucket, prefix, keyMarker, uploadIDMarker, delimiter, maxUploads)
}
// NewMultipartUpload - initialize a new multipart upload, returns a unique id.
func (fs fsObjects) NewMultipartUpload(bucket, object string, meta map[string]string) (string, error) {
meta = make(map[string]string) // Reset the meta value, we are not going to save headers for fs.
return fs.newMultipartUploadCommon(bucket, object, meta)
}
// putObjectPartCommon - put object part.
func (fs fsObjects) putObjectPartCommon(bucket string, object string, uploadID string, partID int, size int64, data io.Reader, md5Hex string) (string, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return "", BucketNameInvalid{Bucket: bucket}
}
// Verify whether the bucket exists.
if !fs.isBucketExist(bucket) {
return "", BucketNotFound{Bucket: bucket}
}
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{Bucket: bucket, Object: object}
}
if !fs.isUploadIDExists(bucket, object, uploadID) {
return "", InvalidUploadID{UploadID: uploadID}
}
// Hold read lock on the uploadID so that no one aborts it.
nsMutex.RLock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
defer nsMutex.RUnlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
// Hold write lock on the part so that there is no parallel upload on the part.
nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID, strconv.Itoa(partID)))
defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID, strconv.Itoa(partID)))
partSuffix := fmt.Sprintf("object%d", partID)
tmpPartPath := path.Join(tmpMetaPrefix, bucket, object, uploadID, partSuffix)
fileWriter, err := fs.storage.CreateFile(minioMetaBucket, tmpPartPath)
if err != nil {
return "", toObjectErr(err, bucket, object)
}
// Initialize md5 writer.
md5Writer := md5.New()
// Instantiate a new multi writer.
multiWriter := io.MultiWriter(md5Writer, fileWriter)
// Instantiate checksum hashers and create a multiwriter.
if size > 0 {
if _, err = io.CopyN(multiWriter, data, size); err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", toObjectErr(clErr, bucket, object)
}
return "", toObjectErr(err, bucket, object)
}
// Reader shouldn't have more data what mentioned in size argument.
// reading one more byte from the reader to validate it.
// expected to fail, success validates existence of more data in the reader.
if _, err = io.CopyN(ioutil.Discard, data, 1); err == nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", toObjectErr(clErr, bucket, object)
}
return "", UnExpectedDataSize{Size: int(size)}
}
} else {
var n int64
if n, err = io.Copy(multiWriter, data); err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", toObjectErr(clErr, bucket, object)
}
return "", toObjectErr(err, bucket, object)
}
size = n
}
newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
if md5Hex != "" {
if newMD5Hex != md5Hex {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", toObjectErr(clErr, bucket, object)
}
return "", BadDigest{md5Hex, newMD5Hex}
}
}
err = fileWriter.Close()
if err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", toObjectErr(clErr, bucket, object)
}
return "", err
}
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
fsMeta, err := fs.readFSMetadata(minioMetaBucket, uploadIDPath)
if err != nil {
return "", toObjectErr(err, minioMetaBucket, uploadIDPath)
}
fsMeta.AddObjectPart(partID, partSuffix, newMD5Hex, size)
partPath := path.Join(mpartMetaPrefix, bucket, object, uploadID, partSuffix)
err = fs.storage.RenameFile(minioMetaBucket, tmpPartPath, minioMetaBucket, partPath)
if err != nil {
if dErr := fs.storage.DeleteFile(minioMetaBucket, tmpPartPath); dErr != nil {
return "", toObjectErr(dErr, minioMetaBucket, tmpPartPath)
}
return "", toObjectErr(err, minioMetaBucket, partPath)
}
if err = fs.writeFSMetadata(minioMetaBucket, path.Join(mpartMetaPrefix, bucket, object, uploadID), fsMeta); err != nil {
return "", toObjectErr(err, minioMetaBucket, path.Join(mpartMetaPrefix, bucket, object, uploadID))
}
return newMD5Hex, nil
}
// PutObjectPart - writes the multipart upload chunks.
func (fs fsObjects) PutObjectPart(bucket, object, uploadID string, partID int, size int64, data io.Reader, md5Hex string) (string, error) {
return fs.putObjectPartCommon(bucket, object, uploadID, partID, size, data, md5Hex)
}
func (fs fsObjects) listObjectPartsCommon(bucket, object, uploadID string, partNumberMarker, maxParts int) (ListPartsInfo, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return ListPartsInfo{}, BucketNameInvalid{Bucket: bucket}
}
// Verify whether the bucket exists.
if !fs.isBucketExist(bucket) {
return ListPartsInfo{}, BucketNotFound{Bucket: bucket}
}
if !IsValidObjectName(object) {
return ListPartsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: object}
}
if !fs.isUploadIDExists(bucket, object, uploadID) {
return ListPartsInfo{}, InvalidUploadID{UploadID: uploadID}
}
// Hold lock so that there is no competing abort-multipart-upload or complete-multipart-upload.
nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
result := ListPartsInfo{}
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
fsMeta, err := fs.readFSMetadata(minioMetaBucket, uploadIDPath)
if err != nil {
return ListPartsInfo{}, toObjectErr(err, minioMetaBucket, uploadIDPath)
}
// Only parts with higher part numbers will be listed.
partIdx := fsMeta.SearchObjectPart(partNumberMarker)
parts := fsMeta.Parts
if partIdx != -1 {
parts = fsMeta.Parts[partIdx+1:]
}
count := maxParts
for _, part := range parts {
var fi FileInfo
partNamePath := path.Join(mpartMetaPrefix, bucket, object, uploadID, part.Name)
fi, err = fs.storage.StatFile(minioMetaBucket, partNamePath)
if err != nil {
return ListPartsInfo{}, toObjectErr(err, minioMetaBucket, partNamePath)
}
result.Parts = append(result.Parts, partInfo{
PartNumber: part.Number,
ETag: part.ETag,
LastModified: fi.ModTime,
Size: fi.Size,
})
count--
if count == 0 {
break
}
}
// If listed entries are more than maxParts, we set IsTruncated as true.
if len(parts) > len(result.Parts) {
result.IsTruncated = true
// Make sure to fill next part number marker if IsTruncated is
// true for subsequent listing.
nextPartNumberMarker := result.Parts[len(result.Parts)-1].PartNumber
result.NextPartNumberMarker = nextPartNumberMarker
}
result.Bucket = bucket
result.Object = object
result.UploadID = uploadID
result.MaxParts = maxParts
return result, nil
}
func (fs fsObjects) ListObjectParts(bucket, object, uploadID string, partNumberMarker, maxParts int) (ListPartsInfo, error) {
return fs.listObjectPartsCommon(bucket, object, uploadID, partNumberMarker, maxParts)
}
// isUploadIDExists - verify if a given uploadID exists and is valid.
func (fs fsObjects) isUploadIDExists(bucket, object, uploadID string) bool {
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
_, err := fs.storage.StatFile(minioMetaBucket, path.Join(uploadIDPath, fsMetaJSONFile))
if err != nil {
if err == errFileNotFound {
return false
}
errorIf(err, "Unable to access upload id"+uploadIDPath)
return false
}
return true
}
func (fs fsObjects) CompleteMultipartUpload(bucket string, object string, uploadID string, parts []completePart) (string, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return "", BucketNameInvalid{Bucket: bucket}
}
// Verify whether the bucket exists.
if !fs.isBucketExist(bucket) {
return "", BucketNotFound{Bucket: bucket}
}
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{
Bucket: bucket,
Object: object,
}
}
if !fs.isUploadIDExists(bucket, object, uploadID) {
return "", InvalidUploadID{UploadID: uploadID}
}
// Calculate s3 compatible md5sum for complete multipart.
s3MD5, err := completeMultipartMD5(parts...)
if err != nil {
return "", err
}
tempObj := path.Join(tmpMetaPrefix, bucket, object, uploadID, "object1")
fileWriter, err := fs.storage.CreateFile(minioMetaBucket, tempObj)
if err != nil {
return "", toObjectErr(err, bucket, object)
}
// Loop through all parts, validate them and then commit to disk.
for i, part := range parts {
// Construct part suffix.
partSuffix := fmt.Sprintf("object%d", part.PartNumber)
multipartPartFile := path.Join(mpartMetaPrefix, bucket, object, uploadID, partSuffix)
var fi FileInfo
fi, err = fs.storage.StatFile(minioMetaBucket, multipartPartFile)
if err != nil {
if err == errFileNotFound {
return "", InvalidPart{}
}
return "", err
}
// All parts except the last part has to be atleast 5MB.
if (i < len(parts)-1) && !isMinAllowedPartSize(fi.Size) {
return "", PartTooSmall{}
}
var fileReader io.ReadCloser
fileReader, err = fs.storage.ReadFile(minioMetaBucket, multipartPartFile, 0)
if err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
if err == errFileNotFound {
return "", InvalidPart{}
}
return "", err
}
_, err = io.Copy(fileWriter, fileReader)
if err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", err
}
err = fileReader.Close()
if err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", err
}
}
err = fileWriter.Close()
if err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", err
}
// Rename the file back to original location, if not delete the temporary object.
err = fs.storage.RenameFile(minioMetaBucket, tempObj, bucket, object)
if err != nil {
if dErr := fs.storage.DeleteFile(minioMetaBucket, tempObj); dErr != nil {
return "", toObjectErr(dErr, minioMetaBucket, tempObj)
}
return "", toObjectErr(err, bucket, object)
}
// Cleanup all the parts if everything else has been safely committed.
if err = cleanupUploadedParts(bucket, object, uploadID, fs.storage); err != nil {
return "", err
}
// Return md5sum.
return s3MD5, nil
}
// abortMultipartUploadCommon - aborts a multipart upload, common
// function used by both object layers.
func (fs fsObjects) abortMultipartUploadCommon(bucket, object, uploadID string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
if !fs.isBucketExist(bucket) {
return BucketNotFound{Bucket: bucket}
}
if !IsValidObjectName(object) {
return ObjectNameInvalid{Bucket: bucket, Object: object}
}
if !fs.isUploadIDExists(bucket, object, uploadID) {
return InvalidUploadID{UploadID: uploadID}
}
// Hold lock so that there is no competing complete-multipart-upload or put-object-part.
nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
// Cleanup all uploaded parts.
if err := cleanupUploadedParts(bucket, object, uploadID, fs.storage); err != nil {
return err
}
// Validate if there are other incomplete upload-id's present for
// the object, if yes do not attempt to delete 'uploads.json'.
uploadIDs, err := getUploadIDs(bucket, object, fs.storage)
if err == nil {
uploadIDIdx := uploadIDs.SearchUploadID(uploadID)
if uploadIDIdx != -1 {
uploadIDs.Uploads = append(uploadIDs.Uploads[:uploadIDIdx], uploadIDs.Uploads[uploadIDIdx+1:]...)
}
if len(uploadIDs.Uploads) > 0 {
return nil
}
}
if err = fs.storage.DeleteFile(minioMetaBucket, path.Join(mpartMetaPrefix, bucket, object, uploadsJSONFile)); err != nil {
return toObjectErr(err, minioMetaBucket, path.Join(mpartMetaPrefix, bucket, object))
}
return nil
}
// AbortMultipartUpload - aborts a multipart upload.
func (fs fsObjects) AbortMultipartUpload(bucket, object, uploadID string) error {
return fs.abortMultipartUploadCommon(bucket, object, uploadID)
}