forked from minio/minio
/
erasure-object.go
2242 lines (1970 loc) · 69.5 KB
/
erasure-object.go
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"net/http"
"path"
"runtime"
"strconv"
"strings"
"sync"
"time"
"github.com/klauspost/readahead"
"github.com/minio/madmin-go/v3"
"github.com/minio/minio-go/v7/pkg/tags"
"github.com/minio/minio/internal/bucket/lifecycle"
"github.com/minio/minio/internal/bucket/object/lock"
"github.com/minio/minio/internal/bucket/replication"
"github.com/minio/minio/internal/crypto"
"github.com/minio/minio/internal/event"
"github.com/minio/minio/internal/hash"
xhttp "github.com/minio/minio/internal/http"
xioutil "github.com/minio/minio/internal/ioutil"
"github.com/minio/minio/internal/logger"
"github.com/minio/pkg/v2/mimedb"
"github.com/minio/pkg/v2/sync/errgroup"
"github.com/minio/pkg/v2/wildcard"
uatomic "go.uber.org/atomic"
)
// list all errors which can be ignored in object operations.
var objectOpIgnoredErrs = append(baseIgnoredErrs, errDiskAccessDenied, errUnformattedDisk)
// Object Operations
func countOnlineDisks(onlineDisks []StorageAPI) (online int) {
for _, onlineDisk := range onlineDisks {
if onlineDisk != nil && onlineDisk.IsOnline() {
online++
}
}
return online
}
// CopyObject - copy object source object to destination object.
// if source object and destination object are same we only
// update metadata.
func (er erasureObjects) CopyObject(ctx context.Context, srcBucket, srcObject, dstBucket, dstObject string, srcInfo ObjectInfo, srcOpts, dstOpts ObjectOptions) (oi ObjectInfo, err error) {
auditObjectErasureSet(ctx, dstObject, &er)
// This call shouldn't be used for anything other than metadata updates or adding self referential versions.
if !srcInfo.metadataOnly {
return oi, NotImplemented{}
}
if !dstOpts.NoLock {
lk := er.NewNSLock(dstBucket, dstObject)
lkctx, err := lk.GetLock(ctx, globalOperationTimeout)
if err != nil {
return oi, err
}
ctx = lkctx.Context()
defer lk.Unlock(lkctx)
}
// Read metadata associated with the object from all disks.
storageDisks := er.getDisks()
var metaArr []FileInfo
var errs []error
// Read metadata associated with the object from all disks.
if srcOpts.VersionID != "" {
metaArr, errs = readAllFileInfo(ctx, storageDisks, srcBucket, srcObject, srcOpts.VersionID, true)
} else {
metaArr, errs = readAllXL(ctx, storageDisks, srcBucket, srcObject, true, false, true)
}
readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, metaArr, errs, er.defaultParityCount)
if err != nil {
if errors.Is(err, errErasureReadQuorum) && !strings.HasPrefix(srcBucket, minioMetaBucket) {
_, derr := er.deleteIfDangling(ctx, srcBucket, srcObject, metaArr, errs, nil, srcOpts)
if derr != nil {
err = derr
}
}
return ObjectInfo{}, toObjectErr(err, srcBucket, srcObject)
}
// List all online disks.
onlineDisks, modTime, etag := listOnlineDisks(storageDisks, metaArr, errs, readQuorum)
// Pick latest valid metadata.
fi, err := pickValidFileInfo(ctx, metaArr, modTime, etag, readQuorum)
if err != nil {
return oi, toObjectErr(err, srcBucket, srcObject)
}
if fi.Deleted {
if srcOpts.VersionID == "" {
return oi, toObjectErr(errFileNotFound, srcBucket, srcObject)
}
return fi.ToObjectInfo(srcBucket, srcObject, srcOpts.Versioned || srcOpts.VersionSuspended), toObjectErr(errMethodNotAllowed, srcBucket, srcObject)
}
filterOnlineDisksInplace(fi, metaArr, onlineDisks)
versionID := srcInfo.VersionID
if srcInfo.versionOnly {
versionID = dstOpts.VersionID
// preserve destination versionId if specified.
if versionID == "" {
versionID = mustGetUUID()
fi.IsLatest = true // we are creating a new version so this is latest.
}
modTime = UTCNow()
}
fi.VersionID = versionID // set any new versionID we might have created
fi.ModTime = modTime // set modTime for the new versionID
if !dstOpts.MTime.IsZero() {
modTime = dstOpts.MTime
fi.ModTime = dstOpts.MTime
}
fi.Metadata = srcInfo.UserDefined
srcInfo.UserDefined["etag"] = srcInfo.ETag
inlineData := fi.InlineData()
freeVersionID := fi.TierFreeVersionID()
freeVersionMarker := fi.TierFreeVersion()
// Update `xl.meta` content on each disks.
for index := range metaArr {
if metaArr[index].IsValid() {
metaArr[index].ModTime = modTime
metaArr[index].VersionID = versionID
if !metaArr[index].InlineData() {
// If the data is not inlined, we may end up incorrectly
// inlining the data here, that leads to an inconsistent
// situation where some objects are were not inlined
// were now inlined, make sure to `nil` the Data such
// that xl.meta is written as expected.
metaArr[index].Data = nil
}
metaArr[index].Metadata = srcInfo.UserDefined
// Preserve existing values
if inlineData {
metaArr[index].SetInlineData()
}
if freeVersionID != "" {
metaArr[index].SetTierFreeVersionID(freeVersionID)
}
if freeVersionMarker {
metaArr[index].SetTierFreeVersion()
}
}
}
// Write unique `xl.meta` for each disk.
if _, err = writeUniqueFileInfo(ctx, onlineDisks, srcBucket, srcObject, metaArr, writeQuorum); err != nil {
return oi, toObjectErr(err, srcBucket, srcObject)
}
return fi.ToObjectInfo(srcBucket, srcObject, srcOpts.Versioned || srcOpts.VersionSuspended), nil
}
// GetObjectNInfo - returns object info and an object
// Read(Closer). When err != nil, the returned reader is always nil.
func (er erasureObjects) GetObjectNInfo(ctx context.Context, bucket, object string, rs *HTTPRangeSpec, h http.Header, opts ObjectOptions) (gr *GetObjectReader, err error) {
auditObjectErasureSet(ctx, object, &er)
// This is a special call attempted first to check for SOS-API calls.
gr, err = veeamSOSAPIGetObject(ctx, bucket, object, rs, opts)
if err == nil {
return gr, nil
}
// reset any error to 'nil'
err = nil
var unlockOnDefer bool
nsUnlocker := func() {}
defer func() {
if unlockOnDefer {
nsUnlocker()
}
}()
// Acquire lock
if !opts.NoLock {
lock := er.NewNSLock(bucket, object)
lkctx, err := lock.GetRLock(ctx, globalOperationTimeout)
if err != nil {
return nil, err
}
ctx = lkctx.Context()
// Release lock when the metadata is verified, and reader
// is ready to be read.
//
// This is possible to be lock free because
// - xl.meta for inlined objects has already read the data
// into memory, any mutation on xl.meta subsequently is
// inconsequential to the overall read operation.
// - xl.meta metadata is still verified for quorum under lock()
// however writing the response doesn't need to serialize
// concurrent writers
unlockOnDefer = true
nsUnlocker = func() { lock.RUnlock(lkctx) }
}
fi, metaArr, onlineDisks, err := er.getObjectFileInfo(ctx, bucket, object, opts, true)
if err != nil {
return nil, toObjectErr(err, bucket, object)
}
if !fi.DataShardFixed() {
diskMTime := pickValidDiskTimeWithQuorum(metaArr, fi.Erasure.DataBlocks)
if !diskMTime.Equal(timeSentinel) && !diskMTime.IsZero() {
for index := range onlineDisks {
if onlineDisks[index] == OfflineDisk {
continue
}
if !metaArr[index].IsValid() {
continue
}
if !metaArr[index].AcceptableDelta(diskMTime, shardDiskTimeDelta) {
// If disk mTime mismatches it is considered outdated
// https://github.com/minio/minio/pull/13803
//
// This check only is active if we could find maximally
// occurring disk mtimes that are somewhat same across
// the quorum. Allowing to skip those shards which we
// might think are wrong.
onlineDisks[index] = OfflineDisk
}
}
}
}
objInfo := fi.ToObjectInfo(bucket, object, opts.Versioned || opts.VersionSuspended)
if objInfo.DeleteMarker {
if opts.VersionID == "" {
return &GetObjectReader{
ObjInfo: objInfo,
}, toObjectErr(errFileNotFound, bucket, object)
}
// Make sure to return object info to provide extra information.
return &GetObjectReader{
ObjInfo: objInfo,
}, toObjectErr(errMethodNotAllowed, bucket, object)
}
if objInfo.IsRemote() {
gr, err := getTransitionedObjectReader(ctx, bucket, object, rs, h, objInfo, opts)
if err != nil {
return nil, err
}
unlockOnDefer = false
return gr.WithCleanupFuncs(nsUnlocker), nil
}
if objInfo.Size == 0 {
// Zero byte objects don't even need to further initialize pipes etc.
return NewGetObjectReaderFromReader(bytes.NewReader(nil), objInfo, opts)
}
fn, off, length, err := NewGetObjectReader(rs, objInfo, opts)
if err != nil {
return nil, err
}
if unlockOnDefer {
unlockOnDefer = fi.InlineData()
}
pr, pw := xioutil.WaitPipe()
go func() {
pw.CloseWithError(er.getObjectWithFileInfo(ctx, bucket, object, off, length, pw, fi, metaArr, onlineDisks))
}()
// Cleanup function to cause the go routine above to exit, in
// case of incomplete read.
pipeCloser := func() {
pr.CloseWithError(nil)
}
if !unlockOnDefer {
return fn(pr, h, pipeCloser, nsUnlocker)
}
return fn(pr, h, pipeCloser)
}
func (er erasureObjects) getObjectWithFileInfo(ctx context.Context, bucket, object string, startOffset int64, length int64, writer io.Writer, fi FileInfo, metaArr []FileInfo, onlineDisks []StorageAPI) error {
// Reorder online disks based on erasure distribution order.
// Reorder parts metadata based on erasure distribution order.
onlineDisks, metaArr = shuffleDisksAndPartsMetadataByIndex(onlineDisks, metaArr, fi)
// For negative length read everything.
if length < 0 {
length = fi.Size - startOffset
}
// Reply back invalid range if the input offset and length fall out of range.
if startOffset > fi.Size || startOffset+length > fi.Size {
logger.LogIf(ctx, InvalidRange{startOffset, length, fi.Size}, logger.Application)
return InvalidRange{startOffset, length, fi.Size}
}
// Get start part index and offset.
partIndex, partOffset, err := fi.ObjectToPartOffset(ctx, startOffset)
if err != nil {
return InvalidRange{startOffset, length, fi.Size}
}
// Calculate endOffset according to length
endOffset := startOffset
if length > 0 {
endOffset += length - 1
}
// Get last part index to read given length.
lastPartIndex, _, err := fi.ObjectToPartOffset(ctx, endOffset)
if err != nil {
return InvalidRange{startOffset, length, fi.Size}
}
var totalBytesRead int64
erasure, err := NewErasure(ctx, fi.Erasure.DataBlocks, fi.Erasure.ParityBlocks, fi.Erasure.BlockSize)
if err != nil {
return toObjectErr(err, bucket, object)
}
var healOnce sync.Once
for ; partIndex <= lastPartIndex; partIndex++ {
if length == totalBytesRead {
break
}
partNumber := fi.Parts[partIndex].Number
// Save the current part name and size.
partSize := fi.Parts[partIndex].Size
partLength := partSize - partOffset
// partLength should be adjusted so that we don't write more data than what was requested.
if partLength > (length - totalBytesRead) {
partLength = length - totalBytesRead
}
tillOffset := erasure.ShardFileOffset(partOffset, partLength, partSize)
// Get the checksums of the current part.
readers := make([]io.ReaderAt, len(onlineDisks))
prefer := make([]bool, len(onlineDisks))
for index, disk := range onlineDisks {
if disk == OfflineDisk {
continue
}
if !metaArr[index].IsValid() {
continue
}
if !metaArr[index].Erasure.Equal(fi.Erasure) {
continue
}
checksumInfo := metaArr[index].Erasure.GetChecksumInfo(partNumber)
partPath := pathJoin(object, metaArr[index].DataDir, fmt.Sprintf("part.%d", partNumber))
readers[index] = newBitrotReader(disk, metaArr[index].Data, bucket, partPath, tillOffset,
checksumInfo.Algorithm, checksumInfo.Hash, erasure.ShardSize())
// Prefer local disks
prefer[index] = disk.Hostname() == ""
}
written, err := erasure.Decode(ctx, writer, readers, partOffset, partLength, partSize, prefer)
// Note: we should not be defer'ing the following closeBitrotReaders() call as
// we are inside a for loop i.e if we use defer, we would accumulate a lot of open files by the time
// we return from this function.
closeBitrotReaders(readers)
if err != nil {
// If we have successfully written all the content that was asked
// by the client, but we still see an error - this would mean
// that we have some parts or data blocks missing or corrupted
// - attempt a heal to successfully heal them for future calls.
if written == partLength {
var scan madmin.HealScanMode
switch {
case errors.Is(err, errFileNotFound):
scan = madmin.HealNormalScan
case errors.Is(err, errFileCorrupt):
scan = madmin.HealDeepScan
}
switch scan {
case madmin.HealNormalScan, madmin.HealDeepScan:
healOnce.Do(func() {
globalMRFState.addPartialOp(partialOperation{
bucket: bucket,
object: object,
versionID: fi.VersionID,
queued: time.Now(),
setIndex: er.setIndex,
poolIndex: er.poolIndex,
})
})
// Healing is triggered and we have written
// successfully the content to client for
// the specific part, we should `nil` this error
// and proceed forward, instead of throwing errors.
err = nil
}
}
if err != nil {
return toObjectErr(err, bucket, object)
}
}
for i, r := range readers {
if r == nil {
onlineDisks[i] = OfflineDisk
}
}
// Track total bytes read from disk and written to the client.
totalBytesRead += partLength
// partOffset will be valid only for the first part, hence reset it to 0 for
// the remaining parts.
partOffset = 0
} // End of read all parts loop.
// Return success.
return nil
}
// GetObjectInfo - reads object metadata and replies back ObjectInfo.
func (er erasureObjects) GetObjectInfo(ctx context.Context, bucket, object string, opts ObjectOptions) (info ObjectInfo, err error) {
auditObjectErasureSet(ctx, object, &er)
// This is a special call attempted first to check for SOS-API calls.
info, err = veeamSOSAPIHeadObject(ctx, bucket, object, opts)
if err == nil {
return info, nil
}
// reset any error to 'nil'
err = nil
if !opts.NoLock {
// Lock the object before reading.
lk := er.NewNSLock(bucket, object)
lkctx, err := lk.GetRLock(ctx, globalOperationTimeout)
if err != nil {
return ObjectInfo{}, err
}
ctx = lkctx.Context()
defer lk.RUnlock(lkctx)
}
return er.getObjectInfo(ctx, bucket, object, opts)
}
func auditDanglingObjectDeletion(ctx context.Context, bucket, object, versionID string, tags map[string]interface{}) {
if len(logger.AuditTargets()) == 0 {
return
}
opts := AuditLogOptions{
Event: "DeleteDanglingObject",
Bucket: bucket,
Object: object,
VersionID: versionID,
Tags: tags,
}
auditLogInternal(ctx, opts)
}
func (er erasureObjects) deleteIfDangling(ctx context.Context, bucket, object string, metaArr []FileInfo, errs []error, dataErrs []error, opts ObjectOptions) (FileInfo, error) {
_, file, line, cok := runtime.Caller(1)
var err error
m, ok := isObjectDangling(metaArr, errs, dataErrs)
if ok {
tags := make(map[string]interface{}, 4)
tags["set"] = er.setIndex
tags["pool"] = er.poolIndex
tags["parity"] = m.Erasure.ParityBlocks
if cok {
tags["caller"] = fmt.Sprintf("%s:%d", file, line)
}
defer auditDanglingObjectDeletion(ctx, bucket, object, m.VersionID, tags)
err = errFileNotFound
if opts.VersionID != "" {
err = errFileVersionNotFound
}
fi := FileInfo{
VersionID: m.VersionID,
}
if opts.VersionID != "" {
fi.VersionID = opts.VersionID
}
fi.SetTierFreeVersionID(mustGetUUID())
disks := er.getDisks()
g := errgroup.WithNErrs(len(disks))
for index := range disks {
index := index
g.Go(func() error {
if disks[index] == nil {
return errDiskNotFound
}
return disks[index].DeleteVersion(ctx, bucket, object, fi, false)
}, index)
}
g.Wait()
}
return m, err
}
func readAllXL(ctx context.Context, disks []StorageAPI, bucket, object string, readData, inclFreeVers, allParts bool) ([]FileInfo, []error) {
metadataArray := make([]*xlMetaV2, len(disks))
metaFileInfos := make([]FileInfo, len(metadataArray))
metadataShallowVersions := make([][]xlMetaV2ShallowVersion, len(disks))
var v2bufs [][]byte
if !readData {
v2bufs = make([][]byte, len(disks))
}
g := errgroup.WithNErrs(len(disks))
// Read `xl.meta` in parallel across disks.
for index := range disks {
index := index
g.Go(func() (err error) {
if disks[index] == nil {
return errDiskNotFound
}
rf, err := disks[index].ReadXL(ctx, bucket, object, readData)
if err != nil {
return err
}
if !readData {
// Save the buffer so we can reuse it.
v2bufs[index] = rf.Buf
}
var xl xlMetaV2
if err = xl.LoadOrConvert(rf.Buf); err != nil {
return err
}
metadataArray[index] = &xl
metaFileInfos[index] = FileInfo{
DiskMTime: rf.DiskMTime,
}
return nil
}, index)
}
ignoredErrs := []error{
errFileNotFound,
errFileNameTooLong,
errVolumeNotFound,
errFileVersionNotFound,
io.ErrUnexpectedEOF, // some times we would read without locks, ignore these errors
io.EOF, // some times we would read without locks, ignore these errors
}
ignoredErrs = append(ignoredErrs, objectOpIgnoredErrs...)
errs := g.Wait()
for index, err := range errs {
if err == nil {
continue
}
if !IsErr(err, ignoredErrs...) {
logger.LogOnceIf(ctx, fmt.Errorf("Drive %s, path (%s/%s) returned an error (%w)",
disks[index], bucket, object, err),
disks[index].String())
}
}
for index := range metadataArray {
if metadataArray[index] != nil {
metadataShallowVersions[index] = metadataArray[index].versions
}
}
readQuorum := (len(disks) + 1) / 2
meta := &xlMetaV2{versions: mergeXLV2Versions(readQuorum, false, 1, metadataShallowVersions...)}
lfi, err := meta.ToFileInfo(bucket, object, "", inclFreeVers, allParts)
if err != nil {
for i := range errs {
if errs[i] == nil {
errs[i] = err
}
}
return metaFileInfos, errs
}
if !lfi.IsValid() {
for i := range errs {
if errs[i] == nil {
errs[i] = errCorruptedFormat
}
}
return metaFileInfos, errs
}
versionID := lfi.VersionID
if versionID == "" {
versionID = nullVersionID
}
for index := range metadataArray {
if metadataArray[index] == nil {
continue
}
// make sure to preserve this for diskmtime based healing bugfix.
diskMTime := metaFileInfos[index].DiskMTime
metaFileInfos[index], errs[index] = metadataArray[index].ToFileInfo(bucket, object, versionID, inclFreeVers, allParts)
if errs[index] != nil {
continue
}
if readData {
metaFileInfos[index].Data = metadataArray[index].data.find(versionID)
}
metaFileInfos[index].DiskMTime = diskMTime
}
if !readData {
for i := range v2bufs {
metaDataPoolPut(v2bufs[i])
}
}
// Return all the metadata.
return metaFileInfos, errs
}
func (er erasureObjects) getObjectFileInfo(ctx context.Context, bucket, object string, opts ObjectOptions, readData bool) (fi FileInfo, metaArr []FileInfo, onlineDisks []StorageAPI, err error) {
disks := er.getDisks()
var errs []error
// Read metadata associated with the object from all disks.
if opts.VersionID != "" {
metaArr, errs = readAllFileInfo(ctx, disks, bucket, object, opts.VersionID, readData)
} else {
metaArr, errs = readAllXL(ctx, disks, bucket, object, readData, opts.InclFreeVersions, true)
}
readQuorum, _, err := objectQuorumFromMeta(ctx, metaArr, errs, er.defaultParityCount)
if err != nil {
if errors.Is(err, errErasureReadQuorum) && !strings.HasPrefix(bucket, minioMetaBucket) {
_, derr := er.deleteIfDangling(ctx, bucket, object, metaArr, errs, nil, opts)
if derr != nil {
err = derr
}
}
return fi, nil, nil, toObjectErr(err, bucket, object)
}
if reducedErr := reduceReadQuorumErrs(ctx, errs, objectOpIgnoredErrs, readQuorum); reducedErr != nil {
if errors.Is(reducedErr, errErasureReadQuorum) && !strings.HasPrefix(bucket, minioMetaBucket) {
_, derr := er.deleteIfDangling(ctx, bucket, object, metaArr, errs, nil, opts)
if derr != nil {
reducedErr = derr
}
}
return fi, nil, nil, toObjectErr(reducedErr, bucket, object)
}
// List all online disks.
onlineDisks, modTime, etag := listOnlineDisks(disks, metaArr, errs, readQuorum)
// Pick latest valid metadata.
fi, err = pickValidFileInfo(ctx, metaArr, modTime, etag, readQuorum)
if err != nil {
return fi, nil, nil, err
}
if !fi.Deleted && len(fi.Erasure.Distribution) != len(onlineDisks) {
err := fmt.Errorf("unexpected file distribution (%v) from online disks (%v), looks like backend disks have been manually modified refusing to heal %s/%s(%s)",
fi.Erasure.Distribution, onlineDisks, bucket, object, opts.VersionID)
logger.LogOnceIf(ctx, err, "get-object-file-info-manually-modified")
return fi, nil, nil, toObjectErr(err, bucket, object, opts.VersionID)
}
filterOnlineDisksInplace(fi, metaArr, onlineDisks)
// if one of the disk is offline, return right here no need
// to attempt a heal on the object.
if countErrs(errs, errDiskNotFound) > 0 {
return fi, metaArr, onlineDisks, nil
}
var missingBlocks int
for i, err := range errs {
if err != nil && errors.Is(err, errFileNotFound) {
missingBlocks++
continue
}
// verify metadata is valid, it has similar erasure info
// as well as common modtime, if modtime is not possible
// verify if it has common "etag" atleast.
if metaArr[i].IsValid() && metaArr[i].Erasure.Equal(fi.Erasure) {
ok := metaArr[i].ModTime.Equal(modTime)
if modTime.IsZero() || modTime.Equal(timeSentinel) {
ok = etag != "" && etag == fi.Metadata["etag"]
}
if ok {
continue
}
} // in all other cases metadata is corrupt, do not read from it.
metaArr[i] = FileInfo{}
onlineDisks[i] = nil
missingBlocks++
}
// if missing metadata can be reconstructed, attempt to reconstruct.
// additionally do not heal delete markers inline, let them be
// healed upon regular heal process.
if !fi.Deleted && missingBlocks > 0 && missingBlocks < readQuorum {
globalMRFState.addPartialOp(partialOperation{
bucket: bucket,
object: object,
versionID: fi.VersionID,
queued: time.Now(),
setIndex: er.setIndex,
poolIndex: er.poolIndex,
})
}
return fi, metaArr, onlineDisks, nil
}
// getObjectInfo - wrapper for reading object metadata and constructs ObjectInfo.
func (er erasureObjects) getObjectInfo(ctx context.Context, bucket, object string, opts ObjectOptions) (objInfo ObjectInfo, err error) {
fi, _, _, err := er.getObjectFileInfo(ctx, bucket, object, opts, false)
if err != nil {
return objInfo, toObjectErr(err, bucket, object)
}
objInfo = fi.ToObjectInfo(bucket, object, opts.Versioned || opts.VersionSuspended)
if fi.Deleted {
if opts.VersionID == "" || opts.DeleteMarker {
return objInfo, toObjectErr(errFileNotFound, bucket, object)
}
// Make sure to return object info to provide extra information.
return objInfo, toObjectErr(errMethodNotAllowed, bucket, object)
}
return objInfo, nil
}
// getObjectInfoAndQuroum - wrapper for reading object metadata and constructs ObjectInfo, additionally returns write quorum for the object.
func (er erasureObjects) getObjectInfoAndQuorum(ctx context.Context, bucket, object string, opts ObjectOptions) (objInfo ObjectInfo, wquorum int, err error) {
fi, _, _, err := er.getObjectFileInfo(ctx, bucket, object, opts, false)
if err != nil {
return objInfo, er.defaultWQuorum(), toObjectErr(err, bucket, object)
}
wquorum = fi.WriteQuorum(er.defaultWQuorum())
objInfo = fi.ToObjectInfo(bucket, object, opts.Versioned || opts.VersionSuspended)
if !fi.VersionPurgeStatus().Empty() && opts.VersionID != "" {
// Make sure to return object info to provide extra information.
return objInfo, wquorum, toObjectErr(errMethodNotAllowed, bucket, object)
}
if fi.Deleted {
if opts.VersionID == "" || opts.DeleteMarker {
return objInfo, wquorum, toObjectErr(errFileNotFound, bucket, object)
}
// Make sure to return object info to provide extra information.
return objInfo, wquorum, toObjectErr(errMethodNotAllowed, bucket, object)
}
return objInfo, wquorum, nil
}
// Similar to rename but renames data from srcEntry to dstEntry at dataDir
func renameData(ctx context.Context, disks []StorageAPI, srcBucket, srcEntry string, metadata []FileInfo, dstBucket, dstEntry string, writeQuorum int) ([]StorageAPI, bool, error) {
g := errgroup.WithNErrs(len(disks))
fvID := mustGetUUID()
for index := range disks {
metadata[index].SetTierFreeVersionID(fvID)
}
diskVersions := make([]uint64, len(disks))
// Rename file on all underlying storage disks.
for index := range disks {
index := index
g.Go(func() error {
if disks[index] == nil {
return errDiskNotFound
}
// Pick one FileInfo for a disk at index.
fi := metadata[index]
// Assign index when index is initialized
if fi.Erasure.Index == 0 {
fi.Erasure.Index = index + 1
}
if !fi.IsValid() {
return errFileCorrupt
}
sign, err := disks[index].RenameData(ctx, srcBucket, srcEntry, fi, dstBucket, dstEntry)
if err != nil {
return err
}
diskVersions[index] = sign
return nil
}, index)
}
// Wait for all renames to finish.
errs := g.Wait()
var versionsDisparity bool
err := reduceWriteQuorumErrs(ctx, errs, objectOpIgnoredErrs, writeQuorum)
if err == nil {
versions := reduceCommonVersions(diskVersions, writeQuorum)
for index, dversions := range diskVersions {
if errs[index] != nil {
continue
}
if versions != dversions {
versionsDisparity = true
break
}
}
}
// We can safely allow RenameData errors up to len(er.getDisks()) - writeQuorum
// otherwise return failure.
return evalDisks(disks, errs), versionsDisparity, err
}
func (er erasureObjects) putMetacacheObject(ctx context.Context, key string, r *PutObjReader, opts ObjectOptions) (objInfo ObjectInfo, err error) {
data := r.Reader
// No metadata is set, allocate a new one.
if opts.UserDefined == nil {
opts.UserDefined = make(map[string]string)
}
storageDisks := er.getDisks()
// Get parity and data drive count based on storage class metadata
parityDrives := globalStorageClass.GetParityForSC(opts.UserDefined[xhttp.AmzStorageClass])
if parityDrives < 0 {
parityDrives = er.defaultParityCount
}
dataDrives := len(storageDisks) - parityDrives
// we now know the number of blocks this object needs for data and parity.
// writeQuorum is dataBlocks + 1
writeQuorum := dataDrives
if dataDrives == parityDrives {
writeQuorum++
}
// Validate input data size and it can never be less than zero.
if data.Size() < -1 {
logger.LogIf(ctx, errInvalidArgument, logger.Application)
return ObjectInfo{}, toObjectErr(errInvalidArgument)
}
// Initialize parts metadata
partsMetadata := make([]FileInfo, len(storageDisks))
fi := newFileInfo(pathJoin(minioMetaBucket, key), dataDrives, parityDrives)
fi.DataDir = mustGetUUID()
// Initialize erasure metadata.
for index := range partsMetadata {
partsMetadata[index] = fi
}
// Order disks according to erasure distribution
var onlineDisks []StorageAPI
onlineDisks, partsMetadata = shuffleDisksAndPartsMetadata(storageDisks, partsMetadata, fi)
erasure, err := NewErasure(ctx, fi.Erasure.DataBlocks, fi.Erasure.ParityBlocks, fi.Erasure.BlockSize)
if err != nil {
return ObjectInfo{}, toObjectErr(err, minioMetaBucket, key)
}
// Fetch buffer for I/O, returns from the pool if not allocates a new one and returns.
var buffer []byte
switch size := data.Size(); {
case size == 0:
buffer = make([]byte, 1) // Allocate atleast a byte to reach EOF
case size >= fi.Erasure.BlockSize:
buffer = er.bp.Get()
defer er.bp.Put(buffer)
case size < fi.Erasure.BlockSize:
// No need to allocate fully blockSizeV1 buffer if the incoming data is smaller.
buffer = make([]byte, size, 2*size+int64(fi.Erasure.ParityBlocks+fi.Erasure.DataBlocks-1))
}
if len(buffer) > int(fi.Erasure.BlockSize) {
buffer = buffer[:fi.Erasure.BlockSize]
}
shardFileSize := erasure.ShardFileSize(data.Size())
writers := make([]io.Writer, len(onlineDisks))
inlineBuffers := make([]*bytes.Buffer, len(onlineDisks))
for i, disk := range onlineDisks {
if disk == nil {
continue
}
if disk.IsOnline() {
inlineBuffers[i] = bytes.NewBuffer(make([]byte, 0, shardFileSize))
writers[i] = newStreamingBitrotWriterBuffer(inlineBuffers[i], DefaultBitrotAlgorithm, erasure.ShardSize())
}
}
n, erasureErr := erasure.Encode(ctx, data, writers, buffer, writeQuorum)
closeBitrotWriters(writers)
if erasureErr != nil {
return ObjectInfo{}, toObjectErr(erasureErr, minioMetaBucket, key)
}
// Should return IncompleteBody{} error when reader has fewer bytes
// than specified in request header.
if n < data.Size() {
return ObjectInfo{}, IncompleteBody{Bucket: minioMetaBucket, Object: key}
}
var index []byte
if opts.IndexCB != nil {
index = opts.IndexCB()
}
modTime := UTCNow()
for i, w := range writers {
if w == nil {
// Make sure to avoid writing to disks which we couldn't complete in erasure.Encode()
onlineDisks[i] = nil
continue
}
partsMetadata[i].Data = inlineBuffers[i].Bytes()
partsMetadata[i].AddObjectPart(1, "", n, data.ActualSize(), modTime, index, nil)
}
// Fill all the necessary metadata.
// Update `xl.meta` content on each disks.
for index := range partsMetadata {
partsMetadata[index].Size = n
partsMetadata[index].Fresh = true
partsMetadata[index].ModTime = modTime
partsMetadata[index].Metadata = opts.UserDefined
}
// Set an additional header when data is inlined.
for index := range partsMetadata {
partsMetadata[index].SetInlineData()
}
for i := 0; i < len(onlineDisks); i++ {
if onlineDisks[i] != nil && onlineDisks[i].IsOnline() {
// Object info is the same in all disks, so we can pick
// the first meta from online disk
fi = partsMetadata[i]
break
}
}
if _, err = writeUniqueFileInfo(ctx, onlineDisks, minioMetaBucket, key, partsMetadata, writeQuorum); err != nil {
return ObjectInfo{}, toObjectErr(err, minioMetaBucket, key)
}
return fi.ToObjectInfo(minioMetaBucket, key, opts.Versioned || opts.VersionSuspended), nil
}
// PutObject - creates an object upon reading from the input stream
// until EOF, erasure codes the data across all disk and additionally
// writes `xl.meta` which carries the necessary metadata for future
// object operations.
func (er erasureObjects) PutObject(ctx context.Context, bucket string, object string, data *PutObjReader, opts ObjectOptions) (objInfo ObjectInfo, err error) {
return er.putObject(ctx, bucket, object, data, opts)