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minio/cmd/fs-v1-multipart.go

687 lines
23 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 cmd
import (
"crypto/md5"
"crypto/sha256"
"encoding/hex"
"fmt"
"hash"
"io"
"path"
"strings"
"time"
)
// listMultipartUploads - lists all multipart uploads.
func (fs fsObjects) listMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
result := ListMultipartsInfo{}
recursive := true
if delimiter == slashSeparator {
recursive = false
}
result.IsTruncated = true
result.MaxUploads = maxUploads
result.KeyMarker = keyMarker
result.Prefix = prefix
result.Delimiter = delimiter
// Not using path.Join() as it strips off the trailing '/'.
multipartPrefixPath := 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 != "" {
multipartMarkerPath = pathJoin(bucket, keyMarker)
}
var uploads []uploadMetadata
var err error
var eof bool
if uploadIDMarker != "" {
keyMarkerLock := nsMutex.NewNSLock(minioMetaMultipartBucket,
pathJoin(bucket, keyMarker))
keyMarkerLock.RLock()
uploads, _, err = listMultipartUploadIDs(bucket, keyMarker, uploadIDMarker, maxUploads, fs.storage)
keyMarkerLock.RUnlock()
if err != nil {
return ListMultipartsInfo{}, err
}
maxUploads = maxUploads - len(uploads)
}
var walkResultCh chan treeWalkResult
var endWalkCh chan struct{}
heal := false // true only for xl.ListObjectsHeal()
if maxUploads > 0 {
walkResultCh, endWalkCh = fs.listPool.Release(listParams{minioMetaMultipartBucket, recursive, multipartMarkerPath, multipartPrefixPath, heal})
if walkResultCh == nil {
endWalkCh = make(chan struct{})
isLeaf := fs.isMultipartUpload
listDir := listDirFactory(isLeaf, fsTreeWalkIgnoredErrs, fs.storage)
walkResultCh = startTreeWalk(minioMetaMultipartBucket, multipartPrefixPath, multipartMarkerPath, recursive, listDir, isLeaf, endWalkCh)
}
for maxUploads > 0 {
walkResult, ok := <-walkResultCh
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 isErrIgnored(walkResult.err, fsTreeWalkIgnoredErrs...) {
eof = true
break
}
return ListMultipartsInfo{}, walkResult.err
}
entry := strings.TrimPrefix(walkResult.entry, retainSlash(bucket))
if strings.HasSuffix(walkResult.entry, slashSeparator) {
uploads = append(uploads, uploadMetadata{
Object: entry,
})
maxUploads--
if maxUploads == 0 {
if walkResult.end {
eof = true
break
}
}
continue
}
var tmpUploads []uploadMetadata
var end bool
uploadIDMarker = ""
entryLock := nsMutex.NewNSLock(minioMetaMultipartBucket,
pathJoin(bucket, entry))
entryLock.RLock()
tmpUploads, end, err = listMultipartUploadIDs(bucket, entry, uploadIDMarker, maxUploads, fs.storage)
entryLock.RUnlock()
if err != nil {
return ListMultipartsInfo{}, err
}
uploads = append(uploads, tmpUploads...)
maxUploads -= len(tmpUploads)
if walkResult.end && end {
eof = true
break
}
}
}
// Loop through all the received uploads fill in the multiparts result.
for _, upload := range uploads {
var objectName string
var uploadID string
if strings.HasSuffix(upload.Object, slashSeparator) {
// All directory entries are common prefixes.
uploadID = "" // Upload ids are empty for CommonPrefixes.
objectName = upload.Object
result.CommonPrefixes = append(result.CommonPrefixes, objectName)
} else {
uploadID = upload.UploadID
objectName = upload.Object
result.Uploads = append(result.Uploads, upload)
}
result.NextKeyMarker = objectName
result.NextUploadIDMarker = uploadID
}
if !eof {
// Save the go-routine state in the pool so that it can continue from where it left off on
// the next request.
fs.listPool.Set(listParams{bucket, recursive, result.NextKeyMarker, prefix, heal}, walkResultCh, endWalkCh)
}
result.IsTruncated = !eof
if !result.IsTruncated {
result.NextKeyMarker = ""
result.NextUploadIDMarker = ""
}
return result, nil
}
// ListMultipartUploads - lists all the pending multipart uploads on a
// bucket. Additionally takes 'prefix, keyMarker, uploadIDmarker and a
// delimiter' which allows us to list uploads match a particular
// prefix or lexically starting from 'keyMarker' or delimiting the
// output to get a directory like listing.
//
// Implements S3 compatible ListMultipartUploads API. The resulting
// ListMultipartsInfo structure is unmarshalled directly into XML and
// replied back to the client.
func (fs fsObjects) ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
if err := checkListMultipartArgs(bucket, prefix, keyMarker, uploadIDMarker, delimiter, fs); err != nil {
return ListMultipartsInfo{}, err
}
return fs.listMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter, maxUploads)
}
// newMultipartUpload - wrapper for initializing a new multipart
// request, returns back a unique upload id.
//
// Internally this function creates 'uploads.json' associated for the
// incoming object at '.minio.sys/multipart/bucket/object/uploads.json' on
// all the disks. `uploads.json` carries metadata regarding on going
// multipart operation on the object.
func (fs fsObjects) newMultipartUpload(bucket string, object string, meta map[string]string) (uploadID string, err error) {
// Initialize `fs.json` values.
fsMeta := newFSMetaV1()
// Save additional metadata.
fsMeta.Meta = meta
// This lock needs to be held for any changes to the directory
// contents of ".minio.sys/multipart/object/"
objectMPartPathLock := nsMutex.NewNSLock(minioMetaMultipartBucket,
pathJoin(bucket, object))
objectMPartPathLock.Lock()
defer objectMPartPathLock.Unlock()
uploadID = mustGetUUID()
initiated := time.Now().UTC()
// Add upload ID to uploads.json
if err = fs.addUploadID(bucket, object, uploadID, initiated); err != nil {
return "", err
}
uploadIDPath := path.Join(bucket, object, uploadID)
if err = writeFSMetadata(fs.storage, minioMetaMultipartBucket, path.Join(uploadIDPath, fsMetaJSONFile), fsMeta); err != nil {
return "", toObjectErr(err, minioMetaMultipartBucket, uploadIDPath)
}
// Return success.
return uploadID, nil
}
// NewMultipartUpload - initialize a new multipart upload, returns a
// unique id. The unique id returned here is of UUID form, for each
// subsequent request each UUID is unique.
//
// Implements S3 compatible initiate multipart API.
func (fs fsObjects) NewMultipartUpload(bucket, object string, meta map[string]string) (string, error) {
if err := checkNewMultipartArgs(bucket, object, fs); err != nil {
return "", err
}
return fs.newMultipartUpload(bucket, object, meta)
}
// Returns if a new part can be appended to fsAppendDataFile.
func partToAppend(fsMeta fsMetaV1, fsAppendMeta fsMetaV1) (part objectPartInfo, appendNeeded bool) {
if len(fsMeta.Parts) == 0 {
return
}
// As fsAppendMeta.Parts will be sorted len(fsAppendMeta.Parts) will naturally be the next part number
nextPartNum := len(fsAppendMeta.Parts) + 1
nextPartIndex := fsMeta.ObjectPartIndex(nextPartNum)
if nextPartIndex == -1 {
return
}
return fsMeta.Parts[nextPartIndex], true
}
// PutObjectPart - reads incoming data until EOF for the part file on
// an ongoing multipart transaction. Internally incoming data is
// written to '.minio.sys/tmp' location and safely renamed to
// '.minio.sys/multipart' for reach parts.
func (fs fsObjects) PutObjectPart(bucket, object, uploadID string, partID int, size int64, data io.Reader, md5Hex string, sha256sum string) (string, error) {
if err := checkPutObjectPartArgs(bucket, object, fs); err != nil {
return "", err
}
uploadIDPath := path.Join(bucket, object, uploadID)
preUploadIDLock := nsMutex.NewNSLock(minioMetaMultipartBucket, uploadIDPath)
preUploadIDLock.RLock()
// Just check if the uploadID exists to avoid copy if it doesn't.
uploadIDExists := fs.isUploadIDExists(bucket, object, uploadID)
preUploadIDLock.RUnlock()
if !uploadIDExists {
return "", traceError(InvalidUploadID{UploadID: uploadID})
}
partSuffix := fmt.Sprintf("object%d", partID)
tmpPartPath := uploadID + "." + mustGetUUID() + "." + partSuffix
// Initialize md5 writer.
md5Writer := md5.New()
hashWriters := []io.Writer{md5Writer}
var sha256Writer hash.Hash
if sha256sum != "" {
sha256Writer = sha256.New()
hashWriters = append(hashWriters, sha256Writer)
}
multiWriter := io.MultiWriter(hashWriters...)
// Limit the reader to its provided size if specified.
var limitDataReader io.Reader
if size > 0 {
// This is done so that we can avoid erroneous clients sending more data than the set content size.
limitDataReader = io.LimitReader(data, size)
} else {
// else we read till EOF.
limitDataReader = data
}
teeReader := io.TeeReader(limitDataReader, multiWriter)
bufSize := int64(readSizeV1)
if size > 0 && bufSize > size {
bufSize = size
}
buf := make([]byte, int(bufSize))
if size > 0 {
// Prepare file to avoid disk fragmentation
err := fs.storage.PrepareFile(minioMetaTmpBucket, tmpPartPath, size)
if err != nil {
return "", toObjectErr(err, minioMetaTmpBucket, tmpPartPath)
}
}
bytesWritten, cErr := fsCreateFile(fs.storage, teeReader, buf, minioMetaTmpBucket, tmpPartPath)
if cErr != nil {
fs.storage.DeleteFile(minioMetaTmpBucket, tmpPartPath)
return "", toObjectErr(cErr, minioMetaTmpBucket, tmpPartPath)
}
// Should return IncompleteBody{} error when reader has fewer
// bytes than specified in request header.
if bytesWritten < size {
fs.storage.DeleteFile(minioMetaTmpBucket, tmpPartPath)
return "", traceError(IncompleteBody{})
}
// Delete temporary part in case of failure. If
// PutObjectPart succeeds then there would be nothing to
// delete.
defer fs.storage.DeleteFile(minioMetaTmpBucket, tmpPartPath)
newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
if md5Hex != "" {
if newMD5Hex != md5Hex {
return "", traceError(BadDigest{md5Hex, newMD5Hex})
}
}
if sha256sum != "" {
newSHA256sum := hex.EncodeToString(sha256Writer.Sum(nil))
if newSHA256sum != sha256sum {
return "", traceError(SHA256Mismatch{})
}
}
// Hold write lock as we are updating fs.json
postUploadIDLock := nsMutex.NewNSLock(minioMetaMultipartBucket, uploadIDPath)
postUploadIDLock.Lock()
defer postUploadIDLock.Unlock()
// Just check if the uploadID exists to avoid copy if it doesn't.
if !fs.isUploadIDExists(bucket, object, uploadID) {
return "", traceError(InvalidUploadID{UploadID: uploadID})
}
fsMetaPath := pathJoin(uploadIDPath, fsMetaJSONFile)
fsMeta, err := readFSMetadata(fs.storage, minioMetaMultipartBucket, fsMetaPath)
if err != nil {
return "", toObjectErr(err, minioMetaMultipartBucket, fsMetaPath)
}
fsMeta.AddObjectPart(partID, partSuffix, newMD5Hex, size)
partPath := path.Join(bucket, object, uploadID, partSuffix)
// Lock the part so that another part upload with same part-number gets blocked
// while the part is getting appended in the background.
partLock := nsMutex.NewNSLock(minioMetaMultipartBucket, partPath)
partLock.Lock()
err = fs.storage.RenameFile(minioMetaTmpBucket, tmpPartPath, minioMetaMultipartBucket, partPath)
if err != nil {
partLock.Unlock()
return "", toObjectErr(traceError(err), minioMetaMultipartBucket, partPath)
}
uploadIDPath = path.Join(bucket, object, uploadID)
if err = writeFSMetadata(fs.storage, minioMetaMultipartBucket, path.Join(uploadIDPath, fsMetaJSONFile), fsMeta); err != nil {
partLock.Unlock()
return "", toObjectErr(err, minioMetaMultipartBucket, uploadIDPath)
}
// Append the part in background.
errCh := fs.bgAppend.append(fs.storage, bucket, object, uploadID, fsMeta)
go func() {
// Also receive the error so that the appendParts go-routine does not block on send.
// But the error received is ignored as fs.PutObjectPart() would have already
// returned success to the client.
<-errCh
partLock.Unlock()
}()
return newMD5Hex, nil
}
// listObjectParts - wrapper scanning through
// '.minio.sys/multipart/bucket/object/UPLOADID'. Lists all the parts
// saved inside '.minio.sys/multipart/bucket/object/UPLOADID'.
func (fs fsObjects) listObjectParts(bucket, object, uploadID string, partNumberMarker, maxParts int) (ListPartsInfo, error) {
result := ListPartsInfo{}
fsMetaPath := path.Join(bucket, object, uploadID, fsMetaJSONFile)
fsMeta, err := readFSMetadata(fs.storage, minioMetaMultipartBucket, fsMetaPath)
if err != nil {
return ListPartsInfo{}, toObjectErr(err, minioMetaBucket, fsMetaPath)
}
// Only parts with higher part numbers will be listed.
partIdx := fsMeta.ObjectPartIndex(partNumberMarker)
parts := fsMeta.Parts
if partIdx != -1 {
parts = fsMeta.Parts[partIdx+1:]
}
count := maxParts
for _, part := range parts {
var fi FileInfo
partNamePath := path.Join(bucket, object, uploadID, part.Name)
fi, err = fs.storage.StatFile(minioMetaMultipartBucket, partNamePath)
if err != nil {
return ListPartsInfo{}, toObjectErr(traceError(err), minioMetaMultipartBucket, 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
}
// ListObjectParts - lists all previously uploaded parts for a given
// object and uploadID. Takes additional input of part-number-marker
// to indicate where the listing should begin from.
//
// Implements S3 compatible ListObjectParts API. The resulting
// ListPartsInfo structure is unmarshalled directly into XML and
// replied back to the client.
func (fs fsObjects) ListObjectParts(bucket, object, uploadID string, partNumberMarker, maxParts int) (ListPartsInfo, error) {
if err := checkListPartsArgs(bucket, object, fs); err != nil {
return ListPartsInfo{}, err
}
// Hold lock so that there is no competing
// abort-multipart-upload or complete-multipart-upload.
uploadIDLock := nsMutex.NewNSLock(minioMetaMultipartBucket,
pathJoin(bucket, object, uploadID))
uploadIDLock.Lock()
defer uploadIDLock.Unlock()
if !fs.isUploadIDExists(bucket, object, uploadID) {
return ListPartsInfo{}, traceError(InvalidUploadID{UploadID: uploadID})
}
return fs.listObjectParts(bucket, object, uploadID, partNumberMarker, maxParts)
}
func (fs fsObjects) totalObjectSize(fsMeta fsMetaV1, parts []completePart) (int64, error) {
objSize := int64(0)
for _, part := range parts {
partIdx := fsMeta.ObjectPartIndex(part.PartNumber)
if partIdx == -1 {
return 0, InvalidPart{}
}
objSize += fsMeta.Parts[partIdx].Size
}
return objSize, nil
}
// CompleteMultipartUpload - completes an ongoing multipart
// transaction after receiving all the parts indicated by the client.
// Returns an md5sum calculated by concatenating all the individual
// md5sums of all the parts.
//
// Implements S3 compatible Complete multipart API.
func (fs fsObjects) CompleteMultipartUpload(bucket string, object string, uploadID string, parts []completePart) (string, error) {
if err := checkCompleteMultipartArgs(bucket, object, fs); err != nil {
return "", err
}
uploadIDPath := path.Join(bucket, object, uploadID)
// Hold lock so that
// 1) no one aborts this multipart upload
// 2) no one does a parallel complete-multipart-upload on this
// multipart upload
uploadIDLock := nsMutex.NewNSLock(minioMetaMultipartBucket, uploadIDPath)
uploadIDLock.Lock()
defer uploadIDLock.Unlock()
if !fs.isUploadIDExists(bucket, object, uploadID) {
return "", traceError(InvalidUploadID{UploadID: uploadID})
}
// Calculate s3 compatible md5sum for complete multipart.
s3MD5, err := getCompleteMultipartMD5(parts)
if err != nil {
return "", err
}
// Read saved fs metadata for ongoing multipart.
fsMetaPath := pathJoin(uploadIDPath, fsMetaJSONFile)
fsMeta, err := readFSMetadata(fs.storage, minioMetaMultipartBucket, fsMetaPath)
if err != nil {
return "", toObjectErr(err, minioMetaMultipartBucket, fsMetaPath)
}
// This lock is held during rename of the appended tmp file to the actual
// location so that any competing GetObject/PutObject/DeleteObject do not race.
objectLock := nsMutex.NewNSLock(bucket, object)
appendFallback := true // In case background-append did not append the required parts.
if isPartsSame(fsMeta.Parts, parts) {
err = fs.bgAppend.complete(fs.storage, bucket, object, uploadID, fsMeta)
if err == nil {
appendFallback = false
objectLock.Lock()
defer objectLock.Unlock()
if err = fs.storage.RenameFile(minioMetaTmpBucket, uploadID, bucket, object); err != nil {
return "", toObjectErr(traceError(err), minioMetaTmpBucket, uploadID)
}
}
}
if appendFallback {
// background append could not do append all the required parts, hence we do it here.
tempObj := uploadID + "-" + "part.1"
// Allocate staging buffer.
var buf = make([]byte, readSizeV1)
var objSize int64
objSize, err = fs.totalObjectSize(fsMeta, parts)
if err != nil {
return "", traceError(err)
}
if objSize > 0 {
// Prepare file to avoid disk fragmentation
err = fs.storage.PrepareFile(minioMetaTmpBucket, tempObj, objSize)
if err != nil {
return "", traceError(err)
}
}
// Loop through all parts, validate them and then commit to disk.
for i, part := range parts {
partIdx := fsMeta.ObjectPartIndex(part.PartNumber)
if partIdx == -1 {
return "", traceError(InvalidPart{})
}
if fsMeta.Parts[partIdx].ETag != part.ETag {
return "", traceError(BadDigest{})
}
// All parts except the last part has to be atleast 5MB.
if (i < len(parts)-1) && !isMinAllowedPartSize(fsMeta.Parts[partIdx].Size) {
return "", traceError(PartTooSmall{
PartNumber: part.PartNumber,
PartSize: fsMeta.Parts[partIdx].Size,
PartETag: part.ETag,
})
}
// Construct part suffix.
partSuffix := fmt.Sprintf("object%d", part.PartNumber)
multipartPartFile := path.Join(bucket, object, uploadID, partSuffix)
offset := int64(0)
totalLeft := fsMeta.Parts[partIdx].Size
for totalLeft > 0 {
curLeft := int64(readSizeV1)
if totalLeft < readSizeV1 {
curLeft = totalLeft
}
var n int64
n, err = fs.storage.ReadFile(minioMetaMultipartBucket, multipartPartFile, offset, buf[:curLeft])
if n > 0 {
if err = fs.storage.AppendFile(minioMetaTmpBucket, tempObj, buf[:n]); err != nil {
return "", toObjectErr(traceError(err), minioMetaTmpBucket, tempObj)
}
}
if err != nil {
if err == io.EOF || err == io.ErrUnexpectedEOF {
break
}
if err == errFileNotFound {
return "", traceError(InvalidPart{})
}
return "", toObjectErr(traceError(err), minioMetaMultipartBucket, multipartPartFile)
}
offset += n
totalLeft -= n
}
}
objectLock.Lock()
defer objectLock.Unlock()
// Rename the file back to original location, if not delete the temporary object.
err = fs.storage.RenameFile(minioMetaTmpBucket, tempObj, bucket, object)
if err != nil {
if dErr := fs.storage.DeleteFile(minioMetaTmpBucket, tempObj); dErr != nil {
return "", toObjectErr(traceError(dErr), minioMetaTmpBucket, tempObj)
}
return "", toObjectErr(traceError(err), bucket, object)
}
}
// No need to save part info, since we have concatenated all parts.
fsMeta.Parts = nil
// Save additional metadata.
if len(fsMeta.Meta) == 0 {
fsMeta.Meta = make(map[string]string)
}
fsMeta.Meta["md5Sum"] = s3MD5
fsMetaPath = path.Join(bucketMetaPrefix, bucket, object, fsMetaJSONFile)
// Write the metadata to a temp file and rename it to the actual location.
if err = writeFSMetadata(fs.storage, minioMetaBucket, fsMetaPath, fsMeta); err != nil {
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 "", toObjectErr(err, bucket, object)
}
// Hold the lock so that two parallel
// complete-multipart-uploads do not leave a stale
// uploads.json behind.
objectMPartPathLock := nsMutex.NewNSLock(minioMetaMultipartBucket,
pathJoin(bucket, object))
objectMPartPathLock.Lock()
defer objectMPartPathLock.Unlock()
// remove entry from uploads.json
if err := fs.removeUploadID(bucket, object, uploadID); err != nil {
return "", toObjectErr(err, minioMetaMultipartBucket, path.Join(bucket, object))
}
// Return md5sum.
return s3MD5, nil
}
// abortMultipartUpload - wrapper for purging an ongoing multipart
// transaction, deletes uploadID entry from `uploads.json` and purges
// the directory at '.minio.sys/multipart/bucket/object/uploadID' holding
// all the upload parts.
func (fs fsObjects) abortMultipartUpload(bucket, object, uploadID string) error {
// Signal appendParts routine to stop waiting for new parts to arrive.
fs.bgAppend.abort(uploadID)
// Cleanup all uploaded parts.
if err := cleanupUploadedParts(bucket, object, uploadID, fs.storage); err != nil {
return err
}
// remove entry from uploads.json with quorum
if err := fs.removeUploadID(bucket, object, uploadID); err != nil {
return toObjectErr(err, bucket, object)
}
// success
return nil
}
// AbortMultipartUpload - aborts an ongoing multipart operation
// signified by the input uploadID. This is an atomic operation
// doesn't require clients to initiate multiple such requests.
//
// All parts are purged from all disks and reference to the uploadID
// would be removed from the system, rollback is not possible on this
// operation.
//
// Implements S3 compatible Abort multipart API, slight difference is
// that this is an atomic idempotent operation. Subsequent calls have
// no affect and further requests to the same uploadID would not be
// honored.
func (fs fsObjects) AbortMultipartUpload(bucket, object, uploadID string) error {
if err := checkAbortMultipartArgs(bucket, object, fs); err != nil {
return err
}
// Hold lock so that there is no competing
// complete-multipart-upload or put-object-part.
uploadIDLock := nsMutex.NewNSLock(minioMetaMultipartBucket,
pathJoin(bucket, object, uploadID))
uploadIDLock.Lock()
defer uploadIDLock.Unlock()
if !fs.isUploadIDExists(bucket, object, uploadID) {
return traceError(InvalidUploadID{UploadID: uploadID})
}
err := fs.abortMultipartUpload(bucket, object, uploadID)
return err
}