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Inline small file data in xl.meta file (#11758)

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Klaus Post 2021-03-30 02:00:55 +02:00 committed by GitHub
parent f5831174e6
commit 2623338dc5
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GPG key ID: 4AEE18F83AFDEB23
19 changed files with 1311 additions and 247 deletions
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42
cmd/bitrot-streaming.go
View file

@ -25,6 +25,7 @@ import (
"io"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/ioutil"
)
type errHashMismatch struct {
@ -37,10 +38,11 @@ func (err *errHashMismatch) Error() string {
// Calculates bitrot in chunks and writes the hash into the stream.
type streamingBitrotWriter struct {
iow io.WriteCloser
h hash.Hash
shardSize int64
canClose chan struct{} // Needed to avoid race explained in Close() call.
iow io.WriteCloser
closeWithErr func(err error) error
h hash.Hash
shardSize int64
canClose chan struct{} // Needed to avoid race explained in Close() call.
}
func (b *streamingBitrotWriter) Write(p []byte) (int, error) {
@ -66,16 +68,24 @@ func (b *streamingBitrotWriter) Close() error {
// 2) pipe.Close()
// Now pipe.Close() can return before the data is read on the other end of the pipe and written to the disk
// Hence an immediate Read() on the file can return incorrect data.
<-b.canClose
if b.canClose != nil {
<-b.canClose
}
return err
}
// Returns streaming bitrot writer implementation.
func newStreamingBitrotWriterBuffer(w io.Writer, algo BitrotAlgorithm, shardSize int64) io.WriteCloser {
return &streamingBitrotWriter{iow: ioutil.NopCloser(w), h: algo.New(), shardSize: shardSize, canClose: nil}
}
// Returns streaming bitrot writer implementation.
func newStreamingBitrotWriter(disk StorageAPI, volume, filePath string, length int64, algo BitrotAlgorithm, shardSize int64, heal bool) io.Writer {
r, w := io.Pipe()
h := algo.New()
bw := &streamingBitrotWriter{w, h, shardSize, make(chan struct{})}
bw := &streamingBitrotWriter{iow: w, closeWithErr: w.CloseWithError, h: h, shardSize: shardSize, canClose: make(chan struct{})}
go func() {
totalFileSize := int64(-1) // For compressed objects length will be unknown (represented by length=-1)
if length != -1 {
@ -123,7 +133,7 @@ func (b *streamingBitrotReader) ReadAt(buf []byte, offset int64) (int, error) {
// For the first ReadAt() call we need to open the stream for reading.
b.currOffset = offset
streamOffset := (offset/b.shardSize)*int64(b.h.Size()) + offset
if len(b.data) == 0 {
if len(b.data) == 0 && b.tillOffset != streamOffset {
b.rc, err = b.disk.ReadFileStream(context.TODO(), b.volume, b.filePath, streamOffset, b.tillOffset-streamOffset)
} else {
b.rc = io.NewSectionReader(bytes.NewReader(b.data), streamOffset, b.tillOffset-streamOffset)
@ -161,15 +171,13 @@ func (b *streamingBitrotReader) ReadAt(buf []byte, offset int64) (int, error) {
func newStreamingBitrotReader(disk StorageAPI, data []byte, volume, filePath string, tillOffset int64, algo BitrotAlgorithm, shardSize int64) *streamingBitrotReader {
h := algo.New()
return &streamingBitrotReader{
disk,
data,
nil,
volume,
filePath,
ceilFrac(tillOffset, shardSize)*int64(h.Size()) + tillOffset,
0,
h,
shardSize,
make([]byte, h.Size()),
disk: disk,
data: data,
volume: volume,
filePath: filePath,
tillOffset: ceilFrac(tillOffset, shardSize)*int64(h.Size()) + tillOffset,
h: h,
shardSize: shardSize,
hashBytes: make([]byte, h.Size()),
}
}

52
cmd/bitrot.go
View file

@ -17,6 +17,7 @@
package cmd
import (
"bytes"
"crypto/sha256"
"errors"
"hash"
@ -143,3 +144,54 @@ func bitrotShardFileSize(size int64, shardSize int64, algo BitrotAlgorithm) int6
}
return ceilFrac(size, shardSize)*int64(algo.New().Size()) + size
}
// bitrotVerify a single stream of data.
func bitrotVerify(r io.Reader, wantSize, partSize int64, algo BitrotAlgorithm, want []byte, shardSize int64) error {
if algo != HighwayHash256S {
h := algo.New()
if n, err := io.Copy(h, r); err != nil || n != wantSize {
// Premature failure in reading the object, file is corrupt.
return errFileCorrupt
}
if !bytes.Equal(h.Sum(nil), want) {
return errFileCorrupt
}
return nil
}
h := algo.New()
hashBuf := make([]byte, h.Size())
buf := make([]byte, shardSize)
left := wantSize
// Calculate the size of the bitrot file and compare
// it with the actual file size.
if left != bitrotShardFileSize(partSize, shardSize, algo) {
return errFileCorrupt
}
for left > 0 {
// Read expected hash...
h.Reset()
n, err := io.ReadFull(r, hashBuf)
if err != nil {
// Read's failed for object with right size, file is corrupt.
return err
}
// Subtract hash length..
left -= int64(n)
if left < shardSize {
shardSize = left
}
read, err := io.CopyBuffer(h, io.LimitReader(r, shardSize), buf)
if err != nil {
// Read's failed for object with right size, at different offsets.
return err
}
left -= read
if !bytes.Equal(h.Sum(nil), hashBuf) {
return errFileCorrupt
}
}
return nil
}

2
cmd/erasure-encode_test.go
View file

@ -139,7 +139,7 @@ func TestErasureEncode(t *testing.T) {
case *wholeBitrotWriter:
w.disk = badDisk{nil}
case *streamingBitrotWriter:
w.iow.(*io.PipeWriter).CloseWithError(errFaultyDisk)
w.closeWithErr(errFaultyDisk)
}
}
if test.offDisks > 0 {

18
cmd/erasure-healing-common.go
View file

@ -17,6 +17,7 @@
package cmd
import (
"bytes"
"context"
"time"
@ -198,8 +199,8 @@ func disksWithAllParts(ctx context.Context, onlineDisks []StorageAPI, partsMetad
dataErrs[i] = errDiskNotFound
continue
}
meta := partsMetadata[i]
if erasureDistributionReliable {
meta := partsMetadata[i]
if !meta.IsValid() {
continue
}
@ -221,6 +222,21 @@ func disksWithAllParts(ctx context.Context, onlineDisks []StorageAPI, partsMetad
}
}
// Always check data, if we got it.
if len(meta.Data) > 0 || meta.Size == 0 {
checksumInfo := meta.Erasure.GetChecksumInfo(meta.Parts[0].Number)
dataErrs[i] = bitrotVerify(bytes.NewBuffer(meta.Data),
int64(len(meta.Data)),
meta.Erasure.ShardFileSize(meta.Size),
checksumInfo.Algorithm,
checksumInfo.Hash, meta.Erasure.ShardSize())
if dataErrs[i] == nil {
// All parts verified, mark it as all data available.
availableDisks[i] = onlineDisk
}
continue
}
switch scanMode {
case madmin.HealDeepScan:
// disk has a valid xl.meta but may not have all the

326
cmd/erasure-healing-common_test.go
View file

@ -177,85 +177,269 @@ func TestListOnlineDisks(t *testing.T) {
}
object := "object"
data := bytes.Repeat([]byte("a"), 1024)
data := bytes.Repeat([]byte("a"), smallFileThreshold*2)
z := obj.(*erasureServerPools)
erasureDisks := z.serverPools[0].sets[0].getDisks()
for i, test := range testCases {
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader(data), int64(len(data)), "", ""), ObjectOptions{})
if err != nil {
t.Fatalf("Failed to putObject %v", err)
}
t.Run(fmt.Sprintf("case-%d", i), func(t *testing.T) {
partsMetadata, errs := readAllFileInfo(ctx, erasureDisks, bucket, object, "", false)
fi, err := getLatestFileInfo(ctx, partsMetadata, errs)
if err != nil {
t.Fatalf("Failed to getLatestFileInfo %v", err)
}
for j := range partsMetadata {
if errs[j] != nil {
t.Fatalf("Test %d: expected error to be nil: %s", i+1, errs[j])
}
partsMetadata[j].ModTime = test.modTimes[j]
}
tamperedIndex := -1
switch test._tamperBackend {
case deletePart:
for index, err := range test.errs {
if err != nil {
continue
}
// Remove a part from a disk
// which has a valid xl.meta,
// and check if that disk
// appears in outDatedDisks.
tamperedIndex = index
dErr := erasureDisks[index].Delete(context.Background(), bucket, pathJoin(object, fi.DataDir, "part.1"), false)
if dErr != nil {
t.Fatalf("Test %d: Failed to delete %s - %v", i+1,
filepath.Join(object, "part.1"), dErr)
}
break
}
case corruptPart:
for index, err := range test.errs {
if err != nil {
continue
}
// Corrupt a part from a disk
// which has a valid xl.meta,
// and check if that disk
// appears in outDatedDisks.
tamperedIndex = index
filePath := pathJoin(erasureDisks[index].String(), bucket, object, fi.DataDir, "part.1")
f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_SYNC, 0)
if err != nil {
t.Fatalf("Failed to open %s: %s\n", filePath, err)
}
f.Write([]byte("oops")) // Will cause bitrot error
f.Close()
break
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader(data), int64(len(data)), "", ""), ObjectOptions{})
if err != nil {
t.Fatalf("Failed to putObject %v", err)
}
}
onlineDisks, modTime := listOnlineDisks(erasureDisks, partsMetadata, test.errs)
if !modTime.Equal(test.expectedTime) {
t.Fatalf("Test %d: Expected modTime to be equal to %v but was found to be %v",
i+1, test.expectedTime, modTime)
}
availableDisks, newErrs := disksWithAllParts(ctx, onlineDisks, partsMetadata, test.errs, bucket, object, madmin.HealDeepScan)
test.errs = newErrs
if test._tamperBackend != noTamper {
if tamperedIndex != -1 && availableDisks[tamperedIndex] != nil {
t.Fatalf("Test %d: disk (%v) with part.1 missing is not a disk with available data",
i+1, erasureDisks[tamperedIndex])
partsMetadata, errs := readAllFileInfo(ctx, erasureDisks, bucket, object, "", false)
fi, err := getLatestFileInfo(ctx, partsMetadata, errs)
if err != nil {
t.Fatalf("Failed to getLatestFileInfo %v", err)
}
}
for j := range partsMetadata {
if errs[j] != nil {
t.Fatalf("Test %d: expected error to be nil: %s", i+1, errs[j])
}
partsMetadata[j].ModTime = test.modTimes[j]
}
tamperedIndex := -1
switch test._tamperBackend {
case deletePart:
for index, err := range test.errs {
if err != nil {
continue
}
// Remove a part from a disk
// which has a valid xl.meta,
// and check if that disk
// appears in outDatedDisks.
tamperedIndex = index
dErr := erasureDisks[index].Delete(context.Background(), bucket, pathJoin(object, fi.DataDir, "part.1"), false)
if dErr != nil {
t.Fatalf("Test %d: Failed to delete %s - %v", i+1,
filepath.Join(object, "part.1"), dErr)
}
break
}
case corruptPart:
for index, err := range test.errs {
if err != nil {
continue
}
// Corrupt a part from a disk
// which has a valid xl.meta,
// and check if that disk
// appears in outDatedDisks.
tamperedIndex = index
filePath := pathJoin(erasureDisks[index].String(), bucket, object, fi.DataDir, "part.1")
f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_SYNC, 0)
if err != nil {
t.Fatalf("Failed to open %s: %s\n", filePath, err)
}
f.Write([]byte("oops")) // Will cause bitrot error
f.Close()
break
}
}
onlineDisks, modTime := listOnlineDisks(erasureDisks, partsMetadata, test.errs)
if !modTime.Equal(test.expectedTime) {
t.Fatalf("Test %d: Expected modTime to be equal to %v but was found to be %v",
i+1, test.expectedTime, modTime)
}
availableDisks, newErrs := disksWithAllParts(ctx, onlineDisks, partsMetadata, test.errs, bucket, object, madmin.HealDeepScan)
test.errs = newErrs
if test._tamperBackend != noTamper {
if tamperedIndex != -1 && availableDisks[tamperedIndex] != nil {
t.Fatalf("Test %d: disk (%v) with part.1 missing is not a disk with available data",
i+1, erasureDisks[tamperedIndex])
}
}
})
}
}
// TestListOnlineDisksSmallObjects - checks if listOnlineDisks and outDatedDisks
// are consistent with each other.
func TestListOnlineDisksSmallObjects(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
obj, disks, err := prepareErasure16(ctx)
if err != nil {
t.Fatalf("Prepare Erasure backend failed - %v", err)
}
defer obj.Shutdown(context.Background())
defer removeRoots(disks)
type tamperKind int
const (
noTamper tamperKind = iota
deletePart tamperKind = iota
corruptPart tamperKind = iota
)
timeSentinel := time.Unix(1, 0).UTC()
threeNanoSecs := time.Unix(3, 0).UTC()
fourNanoSecs := time.Unix(4, 0).UTC()
modTimesThreeNone := []time.Time{
threeNanoSecs, threeNanoSecs, threeNanoSecs, threeNanoSecs,
threeNanoSecs, threeNanoSecs, threeNanoSecs,
timeSentinel, timeSentinel, timeSentinel, timeSentinel,
timeSentinel, timeSentinel, timeSentinel, timeSentinel,
timeSentinel,
}
modTimesThreeFour := []time.Time{
threeNanoSecs, threeNanoSecs, threeNanoSecs, threeNanoSecs,
threeNanoSecs, threeNanoSecs, threeNanoSecs, threeNanoSecs,
fourNanoSecs, fourNanoSecs, fourNanoSecs, fourNanoSecs,
fourNanoSecs, fourNanoSecs, fourNanoSecs, fourNanoSecs,
}
testCases := []struct {
modTimes []time.Time
expectedTime time.Time
errs []error
_tamperBackend tamperKind
}{
{
modTimes: modTimesThreeFour,
expectedTime: fourNanoSecs,
errs: []error{
nil, nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil,
},
_tamperBackend: noTamper,
},
{
modTimes: modTimesThreeNone,
expectedTime: threeNanoSecs,
errs: []error{
// Disks that have a valid xl.meta.
nil, nil, nil, nil, nil, nil, nil,
// Majority of disks don't have xl.meta.
errFileNotFound, errFileNotFound,
errFileNotFound, errFileNotFound,
errFileNotFound, errDiskAccessDenied,
errDiskNotFound, errFileNotFound,
errFileNotFound,
},
_tamperBackend: deletePart,
},
{
modTimes: modTimesThreeNone,
expectedTime: threeNanoSecs,
errs: []error{
// Disks that have a valid xl.meta.
nil, nil, nil, nil, nil, nil, nil,
// Majority of disks don't have xl.meta.
errFileNotFound, errFileNotFound,
errFileNotFound, errFileNotFound,
errFileNotFound, errDiskAccessDenied,
errDiskNotFound, errFileNotFound,
errFileNotFound,
},
_tamperBackend: corruptPart,
},
}
bucket := "bucket"
err = obj.MakeBucketWithLocation(ctx, "bucket", BucketOptions{})
if err != nil {
t.Fatalf("Failed to make a bucket %v", err)
}
object := "object"
data := bytes.Repeat([]byte("a"), smallFileThreshold/2)
z := obj.(*erasureServerPools)
erasureDisks := z.serverPools[0].sets[0].getDisks()
for i, test := range testCases {
t.Run(fmt.Sprintf("case-%d", i), func(t *testing.T) {
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader(data), int64(len(data)), "", ""), ObjectOptions{})
if err != nil {
t.Fatalf("Failed to putObject %v", err)
}
partsMetadata, errs := readAllFileInfo(ctx, erasureDisks, bucket, object, "", true)
_, err := getLatestFileInfo(ctx, partsMetadata, errs)
if err != nil {
t.Fatalf("Failed to getLatestFileInfo %v", err)
}
for j := range partsMetadata {
if errs[j] != nil {
t.Fatalf("Test %d: expected error to be nil: %s", i+1, errs[j])
}
partsMetadata[j].ModTime = test.modTimes[j]
}
if erasureDisks, err = writeUniqueFileInfo(ctx, erasureDisks, bucket, object, partsMetadata, diskCount(erasureDisks)); err != nil {
t.Fatal(ctx, err)
}
tamperedIndex := -1
switch test._tamperBackend {
case deletePart:
for index, err := range test.errs {
if err != nil {
continue
}
// Remove a part from a disk
// which has a valid xl.meta,
// and check if that disk
// appears in outDatedDisks.
tamperedIndex = index
dErr := erasureDisks[index].Delete(context.Background(), bucket, pathJoin(object, xlStorageFormatFile), false)
if dErr != nil {
t.Fatalf("Test %d: Failed to delete %s - %v", i+1,
pathJoin(object, xlStorageFormatFile), dErr)
}
break
}
case corruptPart:
for index, err := range test.errs {
if err != nil {
continue
}
// Corrupt a part from a disk
// which has a valid xl.meta,
// and check if that disk
// appears in outDatedDisks.
tamperedIndex = index
filePath := pathJoin(erasureDisks[index].String(), bucket, object, xlStorageFormatFile)
f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_SYNC, 0)
if err != nil {
t.Fatalf("Failed to open %s: %s\n", filePath, err)
}
f.Write([]byte("oops")) // Will cause bitrot error
f.Close()
break
}
}
partsMetadata, errs = readAllFileInfo(ctx, erasureDisks, bucket, object, "", true)
_, err = getLatestFileInfo(ctx, partsMetadata, errs)
if err != nil {
t.Fatalf("Failed to getLatestFileInfo %v", err)
}
onlineDisks, modTime := listOnlineDisks(erasureDisks, partsMetadata, test.errs)
if !modTime.Equal(test.expectedTime) {
t.Fatalf("Test %d: Expected modTime to be equal to %v but was found to be %v",
i+1, test.expectedTime, modTime)
}
availableDisks, newErrs := disksWithAllParts(ctx, onlineDisks, partsMetadata, test.errs, bucket, object, madmin.HealDeepScan)
test.errs = newErrs
if test._tamperBackend != noTamper {
if tamperedIndex != -1 && availableDisks[tamperedIndex] != nil {
t.Fatalf("Test %d: disk (%v) with part.1 missing is not a disk with available data",
i+1, erasureDisks[tamperedIndex])
}
}
})
}
}

57
cmd/erasure-healing.go
View file

@ -17,6 +17,7 @@
package cmd
import (
"bytes"
"context"
"errors"
"fmt"
@ -230,8 +231,7 @@ func shouldHealObjectOnDisk(erErr, dataErr error, meta FileInfo, quorumModTime t
}
// Heals an object by re-writing corrupt/missing erasure blocks.
func (er erasureObjects) healObject(ctx context.Context, bucket string, object string,
versionID string, partsMetadata []FileInfo, errs []error, lfi FileInfo, opts madmin.HealOpts) (result madmin.HealResultItem, err error) {
func (er erasureObjects) healObject(ctx context.Context, bucket string, object string, versionID string, partsMetadata []FileInfo, errs []error, opts madmin.HealOpts) (result madmin.HealResultItem, err error) {
dryRun := opts.DryRun
scanMode := opts.ScanMode
@ -379,6 +379,11 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
dataDir = migrateDataDir
}
var inlineBuffers []*bytes.Buffer
if len(latestMeta.Parts) <= 1 && latestMeta.Size < smallFileThreshold {
inlineBuffers = make([]*bytes.Buffer, len(outDatedDisks))
}
if !latestMeta.Deleted || latestMeta.TransitionStatus != lifecycle.TransitionComplete {
result.DataBlocks = latestMeta.Erasure.DataBlocks
result.ParityBlocks = latestMeta.Erasure.ParityBlocks
@ -398,6 +403,7 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
}
erasureInfo := latestMeta.Erasure
for partIndex := 0; partIndex < len(latestMeta.Parts); partIndex++ {
partSize := latestMeta.Parts[partIndex].Size
partActualSize := latestMeta.Parts[partIndex].ActualSize
@ -414,7 +420,7 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
if latestMeta.XLV1 {
partPath = pathJoin(object, fmt.Sprintf("part.%d", partNumber))
}
readers[i] = newBitrotReader(disk, nil, bucket, partPath, tillOffset, checksumAlgo, checksumInfo.Hash, erasure.ShardSize())
readers[i] = newBitrotReader(disk, partsMetadata[i].Data, bucket, partPath, tillOffset, checksumAlgo, checksumInfo.Hash, erasure.ShardSize())
}
writers := make([]io.Writer, len(outDatedDisks))
for i, disk := range outDatedDisks {
@ -422,8 +428,13 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
continue
}
partPath := pathJoin(tmpID, dataDir, fmt.Sprintf("part.%d", partNumber))
writers[i] = newBitrotWriter(disk, minioMetaTmpBucket, partPath,
tillOffset, DefaultBitrotAlgorithm, erasure.ShardSize(), true)
if len(inlineBuffers) > 0 {
inlineBuffers[i] = bytes.NewBuffer(make([]byte, 0, erasure.ShardFileSize(latestMeta.Size)))
writers[i] = newStreamingBitrotWriterBuffer(inlineBuffers[i], DefaultBitrotAlgorithm, erasure.ShardSize())
} else {
writers[i] = newBitrotWriter(disk, minioMetaTmpBucket, partPath,
tillOffset, DefaultBitrotAlgorithm, erasure.ShardSize(), true)
}
}
err = erasure.Heal(ctx, readers, writers, partSize)
closeBitrotReaders(readers)
@ -453,6 +464,11 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
Algorithm: checksumAlgo,
Hash: bitrotWriterSum(writers[i]),
})
if len(inlineBuffers) > 0 {
partsMetadata[i].Data = inlineBuffers[i].Bytes()
} else {
partsMetadata[i].Data = nil
}
}
// If all disks are having errors, we give up.
@ -462,6 +478,25 @@ func (er erasureObjects) healObject(ctx context.Context, bucket string, object s
}
}
if len(inlineBuffers) > 0 {
// Write directly...
if outDatedDisks, err = writeUniqueFileInfo(ctx, outDatedDisks, bucket, object, partsMetadata, diskCount(outDatedDisks)); err != nil {
logger.LogIf(ctx, err)
return result, toObjectErr(err, bucket, object)
}
result.ObjectSize = latestMeta.Size
for _, disk := range outDatedDisks {
if disk == OfflineDisk {
continue
}
for i, v := range result.Before.Drives {
if v.Endpoint == disk.String() {
result.After.Drives[i].State = madmin.DriveStateOk
}
}
}
return result, nil
}
defer er.deleteObject(context.Background(), minioMetaTmpBucket, tmpID, len(storageDisks)/2+1)
// Generate and write `xl.meta` generated from other disks.
@ -830,7 +865,13 @@ func (er erasureObjects) HealObject(ctx context.Context, bucket, object, version
storageEndpoints := er.getEndpoints()
// Read metadata files from all the disks
partsMetadata, errs := readAllFileInfo(healCtx, storageDisks, bucket, object, versionID, false)
// When versionID is empty, we read directly from the `null` versionID for healing.
if versionID == "" {
versionID = nullVersionID
}
partsMetadata, errs := readAllFileInfo(healCtx, storageDisks, bucket, object, versionID, true)
if isAllNotFound(errs) {
err = toObjectErr(errFileNotFound, bucket, object)
@ -841,11 +882,11 @@ func (er erasureObjects) HealObject(ctx context.Context, bucket, object, version
return defaultHealResult(FileInfo{}, storageDisks, storageEndpoints, errs, bucket, object, versionID, er.defaultParityCount), err
}
fi, err := getLatestFileInfo(healCtx, partsMetadata, errs)
_, err = getLatestFileInfo(healCtx, partsMetadata, errs)
if err != nil {
return er.purgeObjectDangling(healCtx, bucket, object, versionID, partsMetadata, errs, []error{}, opts)
}
// Heal the object.
return er.healObject(healCtx, bucket, object, versionID, partsMetadata, errs, fi, opts)
return er.healObject(healCtx, bucket, object, versionID, partsMetadata, errs, opts)
}

40
cmd/erasure-object.go
View file

@ -17,6 +17,7 @@
package cmd
import (
"bytes"
"context"
"errors"
"fmt"
@ -735,10 +736,21 @@ func (er erasureObjects) putObject(ctx context.Context, bucket string, object st
}()
writers := make([]io.Writer, len(onlineDisks))
dataSize := data.Size()
var inlineBuffers []*bytes.Buffer
if dataSize >= 0 && dataSize < smallFileThreshold {
inlineBuffers = make([]*bytes.Buffer, len(onlineDisks))
}
for i, disk := range onlineDisks {
if disk == nil {
continue
}
if len(inlineBuffers) > 0 {
inlineBuffers[i] = bytes.NewBuffer(make([]byte, 0, erasure.ShardFileSize(data.Size())))
writers[i] = newStreamingBitrotWriterBuffer(inlineBuffers[i], DefaultBitrotAlgorithm, erasure.ShardSize())
continue
}
writers[i] = newBitrotWriter(disk, minioMetaTmpBucket, tempErasureObj,
erasure.ShardFileSize(data.Size()), DefaultBitrotAlgorithm, erasure.ShardSize(), false)
}
@ -770,6 +782,9 @@ func (er erasureObjects) putObject(ctx context.Context, bucket string, object st
onlineDisks[i] = nil
continue
}
if len(inlineBuffers) > 0 && inlineBuffers[i] != nil {
partsMetadata[i].Data = inlineBuffers[i].Bytes()
}
partsMetadata[i].AddObjectPart(1, "", n, data.ActualSize())
partsMetadata[i].Erasure.AddChecksumInfo(ChecksumInfo{
PartNumber: 1,
@ -797,16 +812,29 @@ func (er erasureObjects) putObject(ctx context.Context, bucket string, object st
partsMetadata[index].Metadata = opts.UserDefined
partsMetadata[index].Size = n
partsMetadata[index].ModTime = modTime
if len(inlineBuffers) > 0 && inlineBuffers[index] != nil {
partsMetadata[index].Data = inlineBuffers[index].Bytes()
}
}
// Write unique `xl.meta` for each disk.
if onlineDisks, err = writeUniqueFileInfo(ctx, onlineDisks, minioMetaTmpBucket, tempObj, partsMetadata, writeQuorum); err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
if len(inlineBuffers) == 0 {
if onlineDisks, err = writeUniqueFileInfo(ctx, onlineDisks, minioMetaTmpBucket, tempObj, partsMetadata, writeQuorum); err != nil {
logger.LogIf(ctx, err)
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
// Rename the successfully written temporary object to final location.
if onlineDisks, err = renameData(ctx, onlineDisks, minioMetaTmpBucket, tempObj, fi.DataDir, bucket, object, writeQuorum, nil); err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
// Rename the successfully written temporary object to final location.
if onlineDisks, err = renameData(ctx, onlineDisks, minioMetaTmpBucket, tempObj, fi.DataDir, bucket, object, writeQuorum, nil); err != nil {
logger.LogIf(ctx, err)
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
} else {
// Write directly...
if onlineDisks, err = writeUniqueFileInfo(ctx, onlineDisks, bucket, object, partsMetadata, writeQuorum); err != nil {
logger.LogIf(ctx, err)
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
}
// Whether a disk was initially or becomes offline

78
cmd/erasure-object_test.go
View file

@ -24,6 +24,7 @@ import (
"io"
"io/ioutil"
"os"
"strconv"
"testing"
humanize "github.com/dustin/go-humanize"
@ -109,6 +110,10 @@ func TestErasureDeleteObjectBasic(t *testing.T) {
for _, test := range testCases {
test := test
t.Run("", func(t *testing.T) {
_, err := xl.GetObjectInfo(ctx, "bucket", "dir/obj", ObjectOptions{})
if err != nil {
t.Fatal("dir/obj not found before last test")
}
_, actualErr := xl.DeleteObject(ctx, test.bucket, test.object, ObjectOptions{})
if test.expectedErr != nil && actualErr != test.expectedErr {
t.Errorf("Expected to fail with %s, but failed with %s", test.expectedErr, actualErr)
@ -462,7 +467,7 @@ func TestPutObjectNoQuorum(t *testing.T) {
object := "object"
opts := ObjectOptions{}
// Create "object" under "bucket".
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader([]byte("abcd")), int64(len("abcd")), "", ""), opts)
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader(bytes.Repeat([]byte{'a'}, smallFileThreshold*2)), smallFileThreshold*2, "", ""), opts)
if err != nil {
t.Fatal(err)
}
@ -470,8 +475,8 @@ func TestPutObjectNoQuorum(t *testing.T) {
// Make 9 disks offline, which leaves less than quorum number of disks
// in a 16 disk Erasure setup. The original disks are 'replaced' with
// naughtyDisks that fail after 'f' successful StorageAPI method
// invocations, where f - [0,3)
for f := 0; f < 3; f++ {
// invocations, where f - [0,4)
for f := 0; f < 4; f++ {
diskErrors := make(map[int]error)
for i := 0; i <= f; i++ {
diskErrors[i] = nil
@ -491,13 +496,78 @@ func TestPutObjectNoQuorum(t *testing.T) {
}
z.serverPools[0].erasureDisksMu.Unlock()
// Upload new content to same object "object"
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader([]byte("abcd")), int64(len("abcd")), "", ""), opts)
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader(bytes.Repeat([]byte{byte(f)}, smallFileThreshold*2)), smallFileThreshold*2, "", ""), opts)
if !errors.Is(err, errErasureWriteQuorum) {
t.Errorf("Expected putObject to fail with %v, but failed with %v", toObjectErr(errErasureWriteQuorum, bucket, object), err)
}
}
}
func TestPutObjectNoQuorumSmall(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
// Create an instance of xl backend.
obj, fsDirs, err := prepareErasure16(ctx)
if err != nil {
t.Fatal(err)
}
// Cleanup backend directories.
defer obj.Shutdown(context.Background())
defer removeRoots(fsDirs)
z := obj.(*erasureServerPools)
xl := z.serverPools[0].sets[0]
// Create "bucket"
err = obj.MakeBucketWithLocation(ctx, "bucket", BucketOptions{})
if err != nil {
t.Fatal(err)
}
bucket := "bucket"
object := "object"
opts := ObjectOptions{}
// Create "object" under "bucket".
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader(bytes.Repeat([]byte{'a'}, smallFileThreshold/2)), smallFileThreshold/2, "", ""), opts)
if err != nil {
t.Fatal(err)
}
// Make 9 disks offline, which leaves less than quorum number of disks
// in a 16 disk Erasure setup. The original disks are 'replaced' with
// naughtyDisks that fail after 'f' successful StorageAPI method
// invocations, where f - [0,2)
for f := 0; f < 2; f++ {
t.Run("exec-"+strconv.Itoa(f), func(t *testing.T) {
diskErrors := make(map[int]error)
for i := 0; i <= f; i++ {
diskErrors[i] = nil
}
erasureDisks := xl.getDisks()
for i := range erasureDisks[:9] {
switch diskType := erasureDisks[i].(type) {
case *naughtyDisk:
erasureDisks[i] = newNaughtyDisk(diskType.disk, diskErrors, errFaultyDisk)
default:
erasureDisks[i] = newNaughtyDisk(erasureDisks[i], diskErrors, errFaultyDisk)
}
}
z.serverPools[0].erasureDisksMu.Lock()
xl.getDisks = func() []StorageAPI {
return erasureDisks
}
z.serverPools[0].erasureDisksMu.Unlock()
// Upload new content to same object "object"
_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t, bytes.NewReader(bytes.Repeat([]byte{byte(f)}, smallFileThreshold/2)), smallFileThreshold/2, "", ""), opts)
if !errors.Is(err, errErasureWriteQuorum) {
t.Errorf("Expected putObject to fail with %v, but failed with %v", toObjectErr(errErasureWriteQuorum, bucket, object), err)
}
})
}
}
func TestObjectQuorumFromMeta(t *testing.T) {
ExecObjectLayerTestWithDirs(t, testObjectQuorumFromMeta)
}

2
cmd/format-erasure.go
View file

@ -913,7 +913,7 @@ func makeFormatErasureMetaVolumes(disk StorageAPI) error {
return errDiskNotFound
}
// Attempt to create MinIO internal buckets.
return disk.MakeVolBulk(context.TODO(), minioMetaBucket, minioMetaTmpBucket, minioMetaMultipartBucket, dataUsageBucket)
return disk.MakeVolBulk(context.TODO(), minioMetaBucket, minioMetaTmpBucket, minioMetaMultipartBucket, minioMetaTmpDeletedBucket, dataUsageBucket, minioMetaTmpBucket+"-old")
}
// Initialize a new set of set formats which will be written to all disks.

2
cmd/metacache-entries.go
View file

@ -128,7 +128,7 @@ func (e *metaCacheEntry) fileInfo(bucket string) (*FileInfo, error) {
}, nil
}
if e.cached == nil {
fi, err := getFileInfo(e.metadata, bucket, e.name, "")
fi, err := getFileInfo(e.metadata, bucket, e.name, "", false)
if err != nil {
return nil, err
}

4
cmd/metacache-walk.go
View file

@ -55,6 +55,7 @@ type WalkDirOptions struct {
// WalkDir will traverse a directory and return all entries found.
// On success a sorted meta cache stream will be returned.
// Metadata has data stripped, if any.
func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writer) error {
// Verify if volume is valid and it exists.
volumeDir, err := s.getVolDir(opts.Bucket)
@ -94,7 +95,7 @@ func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writ
// behavior.
out <- metaCacheEntry{
name: opts.BaseDir,
metadata: metadata,
metadata: xlMetaV2TrimData(metadata),
}
} else {
if st, err := os.Lstat(pathJoin(volumeDir, opts.BaseDir, xlStorageFormatFile)); err == nil && st.Mode().IsRegular() {
@ -156,6 +157,7 @@ func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writ
logger.LogIf(ctx, err)
continue
}
meta.metadata = xlMetaV2TrimData(meta.metadata)
meta.name = strings.TrimSuffix(entry, xlStorageFormatFile)
meta.name = strings.TrimSuffix(meta.name, SlashSeparator)
meta.name = pathJoin(current, meta.name)

6
cmd/object-api-deleteobject_test.go
View file

@ -91,14 +91,16 @@ func testDeleteObject(obj ObjectLayer, instanceType string, t TestErrHandler) {
for _, object := range testCase.objectToUploads {
md5Bytes := md5.Sum([]byte(object.content))
_, err = obj.PutObject(context.Background(), testCase.bucketName, object.name, mustGetPutObjReader(t, strings.NewReader(object.content),
oi, err := obj.PutObject(context.Background(), testCase.bucketName, object.name, mustGetPutObjReader(t, strings.NewReader(object.content),
int64(len(object.content)), hex.EncodeToString(md5Bytes[:]), ""), ObjectOptions{})
t.Log(oi)
if err != nil {
t.Fatalf("%s : %s", instanceType, err.Error())
}
}
_, _ = obj.DeleteObject(context.Background(), testCase.bucketName, testCase.pathToDelete, ObjectOptions{})
oi, err := obj.DeleteObject(context.Background(), testCase.bucketName, testCase.pathToDelete, ObjectOptions{})
t.Log(oi, err)
result, err := obj.ListObjects(context.Background(), testCase.bucketName, "", "", "", 1000)
if err != nil {

3
cmd/object-api-utils.go
View file

@ -207,6 +207,9 @@ const SlashSeparator = "/"
// retainSlash - retains slash from a path.
func retainSlash(s string) string {
if s == "" {
return s
}
return strings.TrimSuffix(s, SlashSeparator) + SlashSeparator
}

9
cmd/test-utils_test.go
View file

@ -54,6 +54,7 @@ import (
"time"
"github.com/fatih/color"
"github.com/gorilla/mux"
"github.com/minio/minio-go/v7/pkg/s3utils"
"github.com/minio/minio-go/v7/pkg/signer"
@ -233,13 +234,7 @@ func initFSObjects(disk string, t *testing.T) (obj ObjectLayer) {
// Using this interface, functionalities to be used in tests can be
// made generalized, and can be integrated in benchmarks/unit tests/go check suite tests.
type TestErrHandler interface {
Log(args ...interface{})
Logf(format string, args ...interface{})
Error(args ...interface{})
Errorf(format string, args ...interface{})
Failed() bool
Fatal(args ...interface{})
Fatalf(format string, args ...interface{})
testing.TB
}
const (

9
cmd/xl-storage-format-utils.go
View file

@ -73,13 +73,18 @@ func getFileInfoVersions(xlMetaBuf []byte, volume, path string) (FileInfoVersion
}, nil
}
func getFileInfo(xlMetaBuf []byte, volume, path, versionID string) (FileInfo, error) {
func getFileInfo(xlMetaBuf []byte, volume, path, versionID string, data bool) (FileInfo, error) {
if isXL2V1Format(xlMetaBuf) {
var xlMeta xlMetaV2
if err := xlMeta.Load(xlMetaBuf); err != nil {
return FileInfo{}, err
}
return xlMeta.ToFileInfo(volume, path, versionID)
fi, err := xlMeta.ToFileInfo(volume, path, versionID)
if !data || err != nil {
return fi, err
}
fi.Data = xlMeta.data.find(fi.DataDir)
return fi, nil
}
xlMeta := &xlMetaV1Object{}

442
cmd/xl-storage-format-v2.go
View file

@ -18,12 +18,15 @@ package cmd
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"sort"
"strings"
"time"
"github.com/tinylib/msgp/msgp"
"github.com/google/uuid"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
@ -33,28 +36,55 @@ var (
// XL header specifies the format
xlHeader = [4]byte{'X', 'L', '2', ' '}
// XLv2 version 1
xlVersionV1 = [4]byte{'1', ' ', ' ', ' '}
// Current version being written.
xlVersionCurrent [4]byte
)
func checkXL2V1(buf []byte) error {
const (
// Breaking changes.
// Newer versions cannot be read by older software.
// This will prevent downgrades to incompatible versions.
xlVersionMajor = 1
// Non breaking changes.
// Bumping this is informational, but should be done
// if any change is made to the data stored, bumping this
// will allow to detect the exact version later.
xlVersionMinor = 1
)
func init() {
binary.LittleEndian.PutUint16(xlVersionCurrent[0:2], xlVersionMajor)
binary.LittleEndian.PutUint16(xlVersionCurrent[2:4], xlVersionMinor)
}
// checkXL2V1 will check if the metadata has correct header and is a known major version.
// The remaining payload and versions are returned.
func checkXL2V1(buf []byte) (payload []byte, major, minor uint16, err error) {
if len(buf) <= 8 {
return fmt.Errorf("xlMeta: no data")
return payload, 0, 0, fmt.Errorf("xlMeta: no data")
}
if !bytes.Equal(buf[:4], xlHeader[:]) {
return fmt.Errorf("xlMeta: unknown XLv2 header, expected %v, got %v", xlHeader[:4], buf[:4])
return payload, 0, 0, fmt.Errorf("xlMeta: unknown XLv2 header, expected %v, got %v", xlHeader[:4], buf[:4])
}
if !bytes.Equal(buf[4:8], xlVersionV1[:]) {
return fmt.Errorf("xlMeta: unknown XLv2 version, expected %v, got %v", xlVersionV1[:4], buf[4:8])
if bytes.Equal(buf[4:8], []byte("1 ")) {
// Set as 1,0.
major, minor = 1, 0
} else {
major, minor = binary.LittleEndian.Uint16(buf[4:6]), binary.LittleEndian.Uint16(buf[6:8])
}
if major > xlVersionMajor {
return buf[8:], major, minor, fmt.Errorf("xlMeta: unknown major version %d found", major)
}
return nil
return buf[8:], major, minor, nil
}
func isXL2V1Format(buf []byte) bool {
return checkXL2V1(buf) == nil
_, _, _, err := checkXL2V1(buf)
return err == nil
}
// The []journal contains all the different versions of the object.
@ -199,6 +229,317 @@ func (j xlMetaV2Version) Valid() bool {
// the journals for the object.
type xlMetaV2 struct {
Versions []xlMetaV2Version `json:"Versions" msg:"Versions"`
// data will contain raw data if any.
// data will be one or more versions indexed by storage dir.
// To remove all data set to nil.
data xlMetaInlineData `msg:"-"`
}
// xlMetaInlineData is serialized data in [string][]byte pairs.
//
//msgp:ignore xlMetaInlineData
type xlMetaInlineData []byte
// xlMetaInlineDataVer indicates the vesrion of the inline data structure.
const xlMetaInlineDataVer = 1
// versionOK returns whether the version is ok.
func (x xlMetaInlineData) versionOK() bool {
if len(x) == 0 {
return true
}
return x[0] > 0 && x[0] <= xlMetaInlineDataVer
}
// afterVersion returns the payload after the version, if any.
func (x xlMetaInlineData) afterVersion() []byte {
if len(x) == 0 {
return x
}
return x[1:]
}
// find the data with key s.
// Returns nil if not for or an error occurs.
func (x xlMetaInlineData) find(key string) []byte {
if len(x) == 0 || !x.versionOK() {
return nil
}
sz, buf, err := msgp.ReadMapHeaderBytes(x.afterVersion())
if err != nil || sz == 0 {
return nil
}
for i := uint32(0); i < sz; i++ {
var found []byte
found, buf, err = msgp.ReadMapKeyZC(buf)
if err != nil || sz == 0 {
return nil
}
if string(found) == key {
val, _, _ := msgp.ReadBytesZC(buf)
return val
}
// Skip it
_, buf, err = msgp.ReadBytesZC(buf)
if err != nil {
return nil
}
}
return nil
}
// validate checks if the data is valid.
// It does not check integrity of the stored data.
func (x xlMetaInlineData) validate() error {
if len(x) == 0 {
return nil
}
if !x.versionOK() {
return fmt.Errorf("xlMetaInlineData: unknown version 0x%x", x[0])
}
sz, buf, err := msgp.ReadMapHeaderBytes(x.afterVersion())
if err != nil {
return err
}
for i := uint32(0); i < sz; i++ {
var key []byte
key, buf, err = msgp.ReadMapKeyZC(buf)
if err != nil {
return err
}
if len(key) == 0 {
return fmt.Errorf("xlMetaInlineData: key %d is length 0", i)
}
_, buf, err = msgp.ReadBytesZC(buf)
if err != nil {
return err
}
}
return nil
}
// validate checks if the data is valid.
// It does not check integrity of the stored data.
func (x xlMetaInlineData) list() ([]string, error) {
if len(x) == 0 {
return nil, nil
}
if !x.versionOK() {
return nil, errors.New("xlMetaInlineData: unknown version")
}
sz, buf, err := msgp.ReadMapHeaderBytes(x.afterVersion())
if err != nil {
return nil, err
}
keys := make([]string, 0, sz)
for i := uint32(0); i < sz; i++ {
var key []byte
key, buf, err = msgp.ReadMapKeyZC(buf)
if err != nil {
return keys, err
}
if len(key) == 0 {
return keys, fmt.Errorf("xlMetaInlineData: key %d is length 0", i)
}
keys = append(keys, string(key))
// Skip data...
_, buf, err = msgp.ReadBytesZC(buf)
if err != nil {
return keys, err
}
}
return keys, nil
}
func (x xlMetaInlineData) entries() int {
if len(x) == 0 || !x.versionOK() {
return 0
}
sz, _, _ := msgp.ReadMapHeaderBytes(x.afterVersion())
return int(sz)
}
// replace will add or replace a key/value pair.
func (x *xlMetaInlineData) replace(key string, value []byte) {
in := x.afterVersion()
sz, buf, _ := msgp.ReadMapHeaderBytes(in)
keys := make([][]byte, 0, sz+1)
vals := make([][]byte, 0, sz+1)
// Version plus header...
plSize := 1 + msgp.MapHeaderSize
replaced := false
for i := uint32(0); i < sz; i++ {
var found, foundVal []byte
var err error
found, buf, err = msgp.ReadMapKeyZC(buf)
if err != nil {
break
}
foundVal, buf, err = msgp.ReadBytesZC(buf)
if err != nil {
break
}
plSize += len(found) + msgp.StringPrefixSize + msgp.ArrayHeaderSize
keys = append(keys, found)
if string(found) == key {
vals = append(vals, value)
plSize += len(value)
replaced = true
} else {
vals = append(vals, foundVal)
plSize += len(foundVal)
}
}
// Add one more.
if !replaced {
keys = append(keys, []byte(key))
vals = append(vals, value)
plSize += len(key) + len(value) + msgp.StringPrefixSize + msgp.ArrayHeaderSize
}
// Reserialize...
payload := make([]byte, 1, plSize)
payload[0] = xlMetaInlineDataVer
payload = msgp.AppendMapHeader(payload, uint32(len(keys)))
for i := range keys {
payload = msgp.AppendStringFromBytes(payload, keys[i])
payload = msgp.AppendBytes(payload, vals[i])
}
*x = payload
if err := x.validate(); err != nil {
panic(err)
}
}
// rename will rename a key.
// Returns whether the key was found.
func (x *xlMetaInlineData) rename(oldKey, newKey string) bool {
in := x.afterVersion()
sz, buf, _ := msgp.ReadMapHeaderBytes(in)
keys := make([][]byte, 0, sz)
vals := make([][]byte, 0, sz)
// Version plus header...
plSize := 1 + msgp.MapHeaderSize
found := false
for i := uint32(0); i < sz; i++ {
var foundKey, foundVal []byte
var err error
foundKey, buf, err = msgp.ReadMapKeyZC(buf)
if err != nil {
break
}
foundVal, buf, err = msgp.ReadBytesZC(buf)
if err != nil {
break
}
plSize += len(foundVal) + msgp.StringPrefixSize + msgp.ArrayHeaderSize
vals = append(vals, foundVal)
if string(foundKey) != oldKey {
keys = append(keys, foundKey)
plSize += len(foundKey)
} else {
keys = append(keys, []byte(newKey))
plSize += len(newKey)
found = true
}
}
// If not found, just return.
if !found {
return false
}
// Reserialize...
payload := make([]byte, 1, plSize)
payload[0] = xlMetaInlineDataVer
payload = msgp.AppendMapHeader(payload, uint32(len(keys)))
for i := range keys {
payload = msgp.AppendStringFromBytes(payload, keys[i])
payload = msgp.AppendBytes(payload, vals[i])
}
*x = payload
return true
}
// remove will remove a key.
// Returns whether the key was found.
func (x *xlMetaInlineData) remove(key string) bool {
in := x.afterVersion()
sz, buf, _ := msgp.ReadMapHeaderBytes(in)
keys := make([][]byte, 0, sz)
vals := make([][]byte, 0, sz)
// Version plus header...
plSize := 1 + msgp.MapHeaderSize
found := false
for i := uint32(0); i < sz; i++ {
var foundKey, foundVal []byte
var err error
foundKey, buf, err = msgp.ReadMapKeyZC(buf)
if err != nil {
break
}
foundVal, buf, err = msgp.ReadBytesZC(buf)
if err != nil {
break
}
if string(foundKey) != key {
plSize += msgp.StringPrefixSize + msgp.ArrayHeaderSize + len(foundKey) + len(foundVal)
keys = append(keys, foundKey)
vals = append(vals, foundVal)
} else {
found = true
}
}
// If not found, just return.
if !found {
return false
}
// If none left...
if len(keys) == 0 {
*x = nil
return true
}
// Reserialize...
payload := make([]byte, 1, plSize)
payload[0] = xlMetaInlineDataVer
payload = msgp.AppendMapHeader(payload, uint32(len(keys)))
for i := range keys {
payload = msgp.AppendStringFromBytes(payload, keys[i])
payload = msgp.AppendBytes(payload, vals[i])
}
*x = payload
return true
}
// xlMetaV2TrimData will trim any data from the metadata without unmarshalling it.
// If any error occurs the unmodified data is returned.
func xlMetaV2TrimData(buf []byte) []byte {
metaBuf, min, maj, err := checkXL2V1(buf)
if err != nil {
return buf
}
if maj == 1 && min < 1 {
// First version to carry data.
return buf
}
// Skip header
_, metaBuf, err = msgp.ReadBytesZC(metaBuf)
if err != nil {
logger.LogIf(GlobalContext, err)
return buf
}
// = input - current pos
ends := len(buf) - len(metaBuf)
if ends > len(buf) {
return buf
}
return buf[:ends]
}
// AddLegacy adds a legacy version, is only called when no prior
@ -219,12 +560,69 @@ func (z *xlMetaV2) AddLegacy(m *xlMetaV1Object) error {
}
// Load unmarshal and load the entire message pack.
// Note that references to the incoming buffer may be kept as data.
func (z *xlMetaV2) Load(buf []byte) error {
if err := checkXL2V1(buf); err != nil {
return err
buf, _, minor, err := checkXL2V1(buf)
if err != nil {
return errFileCorrupt
}
_, err := z.UnmarshalMsg(buf[8:])
return err
switch minor {
case 0:
_, err = z.UnmarshalMsg(buf)
if err != nil {
return errFileCorrupt
}
return nil
case 1:
v, buf, err := msgp.ReadBytesZC(buf)
if err != nil {
return errFileCorrupt
}
_, err = z.UnmarshalMsg(v)
if err != nil {
return errFileCorrupt
}
// Add remaining data.
z.data = nil
if len(buf) > 0 {
z.data = buf
if err := z.data.validate(); err != nil {
return errFileCorrupt
}
}
default:
return errors.New("unknown metadata version")
}
return nil
}
// AppendTo will marshal the data in z and append it to the provided slice.
func (z *xlMetaV2) AppendTo(dst []byte) ([]byte, error) {
sz := len(xlHeader) + len(xlVersionCurrent) + msgp.ArrayHeaderSize + z.Msgsize() + len(z.data) + len(dst)
if cap(dst) < sz {
buf := make([]byte, len(dst), sz)
copy(buf, dst)
dst = buf
}
if err := z.data.validate(); err != nil {
return nil, err
}
dst = append(dst, xlHeader[:]...)
dst = append(dst, xlVersionCurrent[:]...)
// Add "bin 32" type header to always have enough space.
// We will fill out the correct size when we know it.
dst = append(dst, 0xc6, 0, 0, 0, 0)
dataOffset := len(dst)
dst, err := z.MarshalMsg(dst)
if err != nil {
return nil, err
}
// Update size...
binary.BigEndian.PutUint32(dst[dataOffset-4:dataOffset], uint32(len(dst)-dataOffset))
return append(dst, z.data...), nil
}
// AddVersion adds a new version
@ -304,6 +702,10 @@ func (z *xlMetaV2) AddVersion(fi FileInfo) error {
ventry.ObjectV2.MetaUser[k] = v
}
}
// If asked to save data.
if len(fi.Data) > 0 || fi.Size == 0 {
z.data.replace(dd.String(), fi.Data)
}
}
if !ventry.Valid() {
@ -324,7 +726,7 @@ func (z *xlMetaV2) AddVersion(fi FileInfo) error {
return nil
}
case ObjectType:
if bytes.Equal(version.ObjectV2.VersionID[:], uv[:]) {
if version.ObjectV2.VersionID == uv {
z.Versions[i] = ventry
return nil
}
@ -332,7 +734,7 @@ func (z *xlMetaV2) AddVersion(fi FileInfo) error {
// Allowing delete marker to replaced with an proper
// object data type as well, this is not S3 complaint
// behavior but kept here for future flexibility.
if bytes.Equal(version.DeleteMarker.VersionID[:], uv[:]) {
if version.DeleteMarker.VersionID == uv {
z.Versions[i] = ventry
return nil
}
@ -352,7 +754,7 @@ func (j xlMetaV2DeleteMarker) ToFileInfo(volume, path string) (FileInfo, error)
versionID := ""
var uv uuid.UUID
// check if the version is not "null"
if !bytes.Equal(j.VersionID[:], uv[:]) {
if j.VersionID != uv {
versionID = uuid.UUID(j.VersionID).String()
}
fi := FileInfo{
@ -516,7 +918,7 @@ func (z *xlMetaV2) DeleteVersion(fi FileInfo) (string, bool, error) {
return version.ObjectV1.DataDir, len(z.Versions) == 0, nil
}
case DeleteType:
if bytes.Equal(version.DeleteMarker.VersionID[:], uv[:]) {
if version.DeleteMarker.VersionID == uv {
if updateVersion {
if len(z.Versions[i].DeleteMarker.MetaSys) == 0 {
z.Versions[i].DeleteMarker.MetaSys = make(map[string][]byte)
@ -538,7 +940,7 @@ func (z *xlMetaV2) DeleteVersion(fi FileInfo) (string, bool, error) {
return "", len(z.Versions) == 0, nil
}
case ObjectType:
if bytes.Equal(version.ObjectV2.VersionID[:], uv[:]) && updateVersion {
if version.ObjectV2.VersionID == uv && updateVersion {
z.Versions[i].ObjectV2.MetaSys[VersionPurgeStatusKey] = []byte(fi.VersionPurgeStatus)
return "", len(z.Versions) == 0, nil
}
@ -550,7 +952,7 @@ func (z *xlMetaV2) DeleteVersion(fi FileInfo) (string, bool, error) {
for _, version := range versions {
switch version.Type {
case ObjectType:
if bytes.Equal(version.ObjectV2.DataDir[:], dataDir[:]) {
if version.ObjectV2.DataDir == dataDir {
sameDataDirCount++
}
}
@ -564,7 +966,7 @@ func (z *xlMetaV2) DeleteVersion(fi FileInfo) (string, bool, error) {
}
switch version.Type {
case ObjectType:
if bytes.Equal(version.ObjectV2.VersionID[:], uv[:]) {
if version.ObjectV2.VersionID == uv {
if fi.TransitionStatus != "" {
z.Versions[i].ObjectV2.MetaSys[ReservedMetadataPrefixLower+"transition-status"] = []byte(fi.TransitionStatus)
return uuid.UUID(version.ObjectV2.DataDir).String(), len(z.Versions) == 0, nil

144
cmd/xl-storage-format-v2_test.go Normal file
View file

@ -0,0 +1,144 @@
/*
* MinIO Cloud Storage, (C) 2021 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 (
"bytes"
"testing"
"time"
)
func TestXLV2FormatData(t *testing.T) {
failOnErr := func(err error) {
t.Helper()
if err != nil {
t.Fatal(err)
}
}
data := []byte("some object data")
data2 := []byte("some other object data")
xl := xlMetaV2{}
fi := FileInfo{
Volume: "volume",
Name: "object-name",
VersionID: "756100c6-b393-4981-928a-d49bbc164741",
IsLatest: true,
Deleted: false,
TransitionStatus: "",
DataDir: "bffea160-ca7f-465f-98bc-9b4f1c3ba1ef",
XLV1: false,
ModTime: time.Now(),
Size: 0,
Mode: 0,
Metadata: nil,
Parts: nil,
Erasure: ErasureInfo{
Algorithm: ReedSolomon.String(),
DataBlocks: 4,
ParityBlocks: 2,
BlockSize: 10000,
Index: 1,
Distribution: []int{1, 2, 3, 4, 5, 6, 7, 8},
Checksums: []ChecksumInfo{{
PartNumber: 1,
Algorithm: HighwayHash256S,
Hash: nil,
}},
},
MarkDeleted: false,
DeleteMarkerReplicationStatus: "",
VersionPurgeStatus: "",
Data: data,
NumVersions: 1,
SuccessorModTime: time.Time{},
}
failOnErr(xl.AddVersion(fi))
fi.VersionID = mustGetUUID()
fi.DataDir = mustGetUUID()
fi.Data = data2
failOnErr(xl.AddVersion(fi))
serialized, err := xl.AppendTo(nil)
failOnErr(err)
// Roundtrip data
var xl2 xlMetaV2
failOnErr(xl2.Load(serialized))
// We should have one data entry
list, err := xl2.data.list()
failOnErr(err)
if len(list) != 2 {
t.Fatalf("want 1 entry, got %d", len(list))
}
if !bytes.Equal(xl2.data.find("bffea160-ca7f-465f-98bc-9b4f1c3ba1ef"), data) {
t.Fatal("Find data returned", xl2.data.find("bffea160-ca7f-465f-98bc-9b4f1c3ba1ef"))
}
if !bytes.Equal(xl2.data.find(fi.DataDir), data2) {
t.Fatal("Find data returned", xl2.data.find(fi.DataDir))
}
// Remove entry
xl2.data.remove(fi.DataDir)
failOnErr(xl2.data.validate())
if xl2.data.find(fi.DataDir) != nil {
t.Fatal("Data was not removed:", xl2.data.find(fi.DataDir))
}
if xl2.data.entries() != 1 {
t.Fatal("want 1 entry, got", xl2.data.entries())
}
// Re-add
xl2.data.replace(fi.DataDir, fi.Data)
failOnErr(xl2.data.validate())
if xl2.data.entries() != 2 {
t.Fatal("want 2 entries, got", xl2.data.entries())
}
// Replace entry
xl2.data.replace("bffea160-ca7f-465f-98bc-9b4f1c3ba1ef", data2)
failOnErr(xl2.data.validate())
if xl2.data.entries() != 2 {
t.Fatal("want 2 entries, got", xl2.data.entries())
}
if !bytes.Equal(xl2.data.find("bffea160-ca7f-465f-98bc-9b4f1c3ba1ef"), data2) {
t.Fatal("Find data returned", xl2.data.find("bffea160-ca7f-465f-98bc-9b4f1c3ba1ef"))
}
if !xl2.data.rename("bffea160-ca7f-465f-98bc-9b4f1c3ba1ef", "new-key") {
t.Fatal("old key was not found")
}
failOnErr(xl2.data.validate())
if !bytes.Equal(xl2.data.find("new-key"), data2) {
t.Fatal("Find data returned", xl2.data.find("bffea160-ca7f-465f-98bc-9b4f1c3ba1ef"))
}
if xl2.data.entries() != 2 {
t.Fatal("want 2 entries, got", xl2.data.entries())
}
if !bytes.Equal(xl2.data.find(fi.DataDir), data2) {
t.Fatal("Find data returned", xl2.data.find(fi.DataDir))
}
// Test trimmed
xl2 = xlMetaV2{}
failOnErr(xl2.Load(xlMetaV2TrimData(serialized)))
if len(xl2.data) != 0 {
t.Fatal("data, was not trimmed, bytes left:", len(xl2.data))
}
}

159
cmd/xl-storage.go
View file

@ -843,40 +843,49 @@ func (s *xlStorage) DeleteVersion(ctx context.Context, volume, path string, fi F
return err
}
buf, err = xlMeta.MarshalMsg(append(xlHeader[:], xlVersionV1[:]...))
if err != nil {
return err
}
// when data-dir is specified. Transition leverages existing DeleteObject
// api call to mark object as deleted. When object is pending transition,
// just update the metadata and avoid deleting data dir.
if dataDir != "" && fi.TransitionStatus != lifecycle.TransitionPending {
filePath := pathJoin(volumeDir, path, dataDir)
if err = checkPathLength(filePath); err != nil {
return err
}
tmpuuid := mustGetUUID()
if err = renameAll(filePath, pathutil.Join(s.diskPath, minioMetaTmpDeletedBucket, tmpuuid)); err != nil {
return err
}
}
// transitioned objects maintains metadata on the source cluster. When transition
// status is set, update the metadata to disk.
if !lastVersion || fi.TransitionStatus != "" {
// when data-dir is specified. Transition leverages existing DeleteObject
// api call to mark object as deleted. When object is pending transition,
// just update the metadata and avoid deleting data dir.
if dataDir != "" && fi.TransitionStatus != lifecycle.TransitionPending {
xlMeta.data.remove(dataDir)
filePath := pathJoin(volumeDir, path, dataDir)
if err = checkPathLength(filePath); err != nil {
return err
}
tmpuuid := mustGetUUID()
if err = renameAll(filePath, pathutil.Join(s.diskPath, minioMetaTmpDeletedBucket, tmpuuid)); err != nil {
if err != errFileNotFound {
return err
}
}
}
buf, err = xlMeta.AppendTo(nil)
if err != nil {
return err
}
return s.WriteAll(ctx, volume, pathJoin(path, xlStorageFormatFile), buf)
}
// Delete the meta file, if there are no more versions the
// top level parent is automatically removed.
filePath := pathJoin(volumeDir, path, xlStorageFormatFile)
// Move everything to trash.
filePath := retainSlash(pathJoin(volumeDir, path))
if err = checkPathLength(filePath); err != nil {
return err
}
err = renameAll(filePath, pathutil.Join(s.diskPath, minioMetaTmpDeletedBucket, mustGetUUID()))
return s.deleteFile(volumeDir, filePath, false)
// Delete parents if needed.
filePath = retainSlash(pathutil.Dir(pathJoin(volumeDir, path)))
if filePath == retainSlash(volumeDir) {
return err
}
s.deleteFile(volumeDir, filePath, false)
return err
}
// WriteMetadata - writes FileInfo metadata for path at `xl.meta`
@ -890,26 +899,36 @@ func (s *xlStorage) WriteMetadata(ctx context.Context, volume, path string, fi F
if !isXL2V1Format(buf) {
xlMeta, err = newXLMetaV2(fi)
if err != nil {
logger.LogIf(ctx, err)
return err
}
buf, err = xlMeta.MarshalMsg(append(xlHeader[:], xlVersionV1[:]...))
buf, err = xlMeta.AppendTo(nil)
if err != nil {
logger.LogIf(ctx, err)
return err
}
if err := xlMeta.Load(buf); err != nil {
panic(err)
}
} else {
if err = xlMeta.Load(buf); err != nil {
logger.LogIf(ctx, err)
return err
}
if err = xlMeta.AddVersion(fi); err != nil {
logger.LogIf(ctx, err)
return err
}
buf, err = xlMeta.MarshalMsg(append(xlHeader[:], xlVersionV1[:]...))
buf, err = xlMeta.AppendTo(nil)
if err != nil {
logger.LogIf(ctx, err)
return err
}
}
return s.WriteAll(ctx, volume, pathJoin(path, xlStorageFormatFile), buf)
}
func (s *xlStorage) renameLegacyMetadata(volumeDir, path string) (err error) {
@ -1005,16 +1024,20 @@ func (s *xlStorage) ReadVersion(ctx context.Context, volume, path, versionID str
return fi, errFileNotFound
}
fi, err = getFileInfo(buf, volume, path, versionID)
fi, err = getFileInfo(buf, volume, path, versionID, readData)
if err != nil {
return fi, err
}
if readData {
if len(fi.Data) > 0 || fi.Size == 0 {
return fi, nil
}
// Reading data for small objects when
// - object has not yet transitioned
// - object size lesser than 32KiB
// - object has maximum of 1 parts
if fi.TransitionStatus == "" && fi.DataDir != "" && fi.Size <= smallFileThreshold && len(fi.Parts) == 1 {
// Enable O_DIRECT optionally only if drive supports it.
requireDirectIO := globalStorageClass.GetDMA() == storageclass.DMAReadWrite
@ -1801,8 +1824,9 @@ func (s *xlStorage) RenameData(ctx context.Context, srcVolume, srcPath, dataDir,
return osErrToFileErr(err)
}
fi, err := getFileInfo(srcBuf, dstVolume, dstPath, "")
fi, err := getFileInfo(srcBuf, dstVolume, dstPath, "", true)
if err != nil {
logger.LogIf(ctx, err)
return err
}
@ -1955,29 +1979,36 @@ func (s *xlStorage) RenameData(ctx context.Context, srcVolume, srcPath, dataDir,
return err
}
dstBuf, err = xlMeta.MarshalMsg(append(xlHeader[:], xlVersionV1[:]...))
dstBuf, err = xlMeta.AppendTo(nil)
if err != nil {
logger.LogIf(ctx, err)
return errFileCorrupt
}
if err = s.WriteAll(ctx, srcVolume, pathJoin(srcPath, xlStorageFormatFile), dstBuf); err != nil {
return err
}
// Commit data
// Commit data, if any
if srcDataPath != "" {
if err = s.WriteAll(ctx, srcVolume, pathJoin(srcPath, xlStorageFormatFile), dstBuf); err != nil {
return err
}
tmpuuid := mustGetUUID()
renameAll(oldDstDataPath, pathutil.Join(s.diskPath, minioMetaTmpDeletedBucket, tmpuuid))
tmpuuid = mustGetUUID()
renameAll(dstDataPath, pathutil.Join(s.diskPath, minioMetaTmpDeletedBucket, tmpuuid))
if err = renameAll(srcDataPath, dstDataPath); err != nil {
logger.LogIf(ctx, err)
return osErrToFileErr(err)
}
}
// Commit meta-file
if err = renameAll(srcFilePath, dstFilePath); err != nil {
return osErrToFileErr(err)
// Commit meta-file
if err = renameAll(srcFilePath, dstFilePath); err != nil {
return osErrToFileErr(err)
}
} else {
// Write meta-file directly, no data
if err = s.WriteAll(ctx, dstVolume, pathJoin(dstPath, xlStorageFormatFile), dstBuf); err != nil {
return err
}
}
// Remove parent dir of the source file if empty
@ -2074,63 +2105,13 @@ func (s *xlStorage) bitrotVerify(partPath string, partSize int64, algo BitrotAlg
// Close the file descriptor.
defer file.Close()
if algo != HighwayHash256S {
h := algo.New()
if _, err = io.Copy(h, file); err != nil {
// Premature failure in reading the object,file is corrupt.
return errFileCorrupt
}
if !bytes.Equal(h.Sum(nil), sum) {
return errFileCorrupt
}
return nil
}
buf := make([]byte, shardSize)
h := algo.New()
hashBuf := make([]byte, h.Size())
fi, err := file.Stat()
if err != nil {
// Unable to stat on the file, return an expected error
// for healing code to fix this file.
return err
}
size := fi.Size()
// Calculate the size of the bitrot file and compare
// it with the actual file size.
if size != bitrotShardFileSize(partSize, shardSize, algo) {
return errFileCorrupt
}
var n int
for {
if size == 0 {
return nil
}
h.Reset()
n, err = file.Read(hashBuf)
if err != nil {
// Read's failed for object with right size, file is corrupt.
return err
}
size -= int64(n)
if size < int64(len(buf)) {
buf = buf[:size]
}
n, err = file.Read(buf)
if err != nil {
// Read's failed for object with right size, at different offsets.
return err
}
size -= int64(n)
h.Write(buf)
if !bytes.Equal(h.Sum(nil), hashBuf) {
return errFileCorrupt
}
}
return bitrotVerify(file, fi.Size(), partSize, algo, sum, shardSize)
}
func (s *xlStorage) VerifyFile(ctx context.Context, volume, path string, fi FileInfo) (err error) {

163
docs/bucket/versioning/xl-meta.go
View file

@ -18,9 +18,12 @@ package main
import (
"bytes"
"encoding/binary"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"os"
@ -28,8 +31,6 @@ import (
"github.com/tinylib/msgp/msgp"
)
var xlHeader = [4]byte{'X', 'L', '2', ' '}
func main() {
app := cli.NewApp()
app.Copyright = "MinIO, Inc."
@ -53,6 +54,10 @@ GLOBAL FLAGS:
Usage: "Print each file as a separate line without formatting",
Name: "ndjson",
},
cli.BoolFlag{
Usage: "Display inline data keys and sizes",
Name: "data",
},
}
app.Action = func(c *cli.Context) error {
@ -75,39 +80,57 @@ GLOBAL FLAGS:
r = f
}
// Read header
var tmp [4]byte
_, err := io.ReadFull(r, tmp[:])
b, err := ioutil.ReadAll(r)
if err != nil {
return err
}
if !bytes.Equal(tmp[:], xlHeader[:]) {
return fmt.Errorf("xlMeta: unknown XLv2 header, expected %v, got %v", xlHeader[:4], tmp[:4])
}
// Skip version check for now
_, err = io.ReadFull(r, tmp[:])
b, _, minor, err := checkXL2V1(b)
if err != nil {
return err
}
var buf bytes.Buffer
_, err = msgp.CopyToJSON(&buf, r)
if err != nil {
return err
buf := bytes.NewBuffer(nil)
var data xlMetaInlineData
switch minor {
case 0:
_, err = msgp.CopyToJSON(buf, bytes.NewBuffer(b))
if err != nil {
return err
}
case 1:
v, b, err := msgp.ReadBytesZC(b)
if err != nil {
return err
}
_, err = msgp.CopyToJSON(buf, bytes.NewBuffer(v))
if err != nil {
return err
}
data = b
default:
return errors.New("unknown metadata version")
}
if c.Bool("data") {
b, err := data.json()
if err != nil {
return err
}
buf = bytes.NewBuffer(b)
}
if c.Bool("ndjson") {
fmt.Println(buf.String())
continue
}
var msi map[string]interface{}
dec := json.NewDecoder(&buf)
dec := json.NewDecoder(buf)
// Use number to preserve integers.
dec.UseNumber()
err = dec.Decode(&msi)
if err != nil {
return err
}
b, err := json.MarshalIndent(msi, "", " ")
b, err = json.MarshalIndent(msi, "", " ")
if err != nil {
return err
}
@ -120,3 +143,111 @@ GLOBAL FLAGS:
log.Fatal(err)
}
}
var (
// XL header specifies the format
xlHeader = [4]byte{'X', 'L', '2', ' '}
// Current version being written.
xlVersionCurrent [4]byte
)
const (
// Breaking changes.
// Newer versions cannot be read by older software.
// This will prevent downgrades to incompatible versions.
xlVersionMajor = 1
// Non breaking changes.
// Bumping this is informational, but should be done
// if any change is made to the data stored, bumping this
// will allow to detect the exact version later.
xlVersionMinor = 1
)
func init() {
binary.LittleEndian.PutUint16(xlVersionCurrent[0:2], xlVersionMajor)
binary.LittleEndian.PutUint16(xlVersionCurrent[2:4], xlVersionMinor)
}
// checkXL2V1 will check if the metadata has correct header and is a known major version.
// The remaining payload and versions are returned.
func checkXL2V1(buf []byte) (payload []byte, major, minor uint16, err error) {
if len(buf) <= 8 {
return payload, 0, 0, fmt.Errorf("xlMeta: no data")
}
if !bytes.Equal(buf[:4], xlHeader[:]) {
return payload, 0, 0, fmt.Errorf("xlMeta: unknown XLv2 header, expected %v, got %v", xlHeader[:4], buf[:4])
}
if bytes.Equal(buf[4:8], []byte("1 ")) {
// Set as 1,0.
major, minor = 1, 0
} else {
major, minor = binary.LittleEndian.Uint16(buf[4:6]), binary.LittleEndian.Uint16(buf[6:8])
}
if major > xlVersionMajor {
return buf[8:], major, minor, fmt.Errorf("xlMeta: unknown major version %d found", major)
}
return buf[8:], major, minor, nil
}
const xlMetaInlineDataVer = 1
type xlMetaInlineData []byte
// afterVersion returns the payload after the version, if any.
func (x xlMetaInlineData) afterVersion() []byte {
if len(x) == 0 {
return x
}
return x[1:]
}
// versionOK returns whether the version is ok.
func (x xlMetaInlineData) versionOK() bool {
if len(x) == 0 {
return true
}
return x[0] > 0 && x[0] <= xlMetaInlineDataVer
}
func (x xlMetaInlineData) json() ([]byte, error) {
if len(x) == 0 {
return []byte("{}"), nil
}
if !x.versionOK() {
return nil, errors.New("xlMetaInlineData: unknown version")
}
sz, buf, err := msgp.ReadMapHeaderBytes(x.afterVersion())
if err != nil {
return nil, err
}
res := []byte("{")
for i := uint32(0); i < sz; i++ {
var key, val []byte
key, buf, err = msgp.ReadMapKeyZC(buf)
if err != nil {
return nil, err
}
if len(key) == 0 {
return nil, fmt.Errorf("xlMetaInlineData: key %d is length 0", i)
}
// Skip data...
val, buf, err = msgp.ReadBytesZC(buf)
if err != nil {
return nil, err
}
if i > 0 {
res = append(res, ',')
}
s := fmt.Sprintf(`"%s":%d`, string(key), len(val))
res = append(res, []byte(s)...)
}
res = append(res, '}')
return res, nil
}