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minio/cmd/erasure-bucket.go

276 lines
8.4 KiB

/*
* MinIO Cloud Storage, (C) 2016-2020 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 (
"context"
"sort"
"github.com/minio/minio-go/v6/pkg/s3utils"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/sync/errgroup"
)
// list all errors that can be ignore in a bucket operation.
var bucketOpIgnoredErrs = append(baseIgnoredErrs, errDiskAccessDenied)
// list all errors that can be ignored in a bucket metadata operation.
var bucketMetadataOpIgnoredErrs = append(bucketOpIgnoredErrs, errVolumeNotFound)
/// Bucket operations
// MakeBucket - make a bucket.
func (er erasureObjects) MakeBucketWithLocation(ctx context.Context, bucket string, opts BucketOptions) error {
// Verify if bucket is valid.
if err := s3utils.CheckValidBucketNameStrict(bucket); err != nil {
return BucketNameInvalid{Bucket: bucket}
}
storageDisks := er.getDisks()
g := errgroup.WithNErrs(len(storageDisks))
// Make a volume entry on all underlying storage disks.
for index := range storageDisks {
index := index
g.Go(func() error {
if storageDisks[index] != nil {
if err := storageDisks[index].MakeVol(bucket); err != nil {
if err != errVolumeExists {
logger.LogIf(ctx, err)
}
return err
}
return nil
}
return errDiskNotFound
}, index)
}
writeQuorum := getWriteQuorum(len(storageDisks))
err := reduceWriteQuorumErrs(ctx, g.Wait(), bucketOpIgnoredErrs, writeQuorum)
return toObjectErr(err, bucket)
}
func undoDeleteBucket(storageDisks []StorageAPI, bucket string) {
g := errgroup.WithNErrs(len(storageDisks))
// Undo previous make bucket entry on all underlying storage disks.
for index := range storageDisks {
if storageDisks[index] == nil {
continue
}
index := index
g.Go(func() error {
_ = storageDisks[index].MakeVol(bucket)
return nil
}, index)
}
// Wait for all make vol to finish.
g.Wait()
}
// getBucketInfo - returns the BucketInfo from one of the load balanced disks.
func (er erasureObjects) getBucketInfo(ctx context.Context, bucketName string) (bucketInfo BucketInfo, err error) {
var bucketErrs []error
for _, disk := range er.getLoadBalancedDisks() {
if disk == nil {
bucketErrs = append(bucketErrs, errDiskNotFound)
continue
}
volInfo, serr := disk.StatVol(bucketName)
if serr == nil {
return BucketInfo(volInfo), nil
}
err = serr
// For any reason disk went offline continue and pick the next one.
if IsErrIgnored(err, bucketMetadataOpIgnoredErrs...) {
bucketErrs = append(bucketErrs, err)
continue
}
// Any error which cannot be ignored, we return quickly.
return BucketInfo{}, err
}
// If all our errors were ignored, then we try to
// reduce to one error based on read quorum.
// `nil` is deliberately passed for ignoredErrs
// because these errors were already ignored.
readQuorum := getReadQuorum(len(er.getDisks()))
return BucketInfo{}, reduceReadQuorumErrs(ctx, bucketErrs, nil, readQuorum)
}
// GetBucketInfo - returns BucketInfo for a bucket.
func (er erasureObjects) GetBucketInfo(ctx context.Context, bucket string) (bi BucketInfo, e error) {
bucketInfo, err := er.getBucketInfo(ctx, bucket)
if err != nil {
return bi, toObjectErr(err, bucket)
}
return bucketInfo, nil
}
// listBuckets - returns list of all buckets from a disk picked at random.
func (er erasureObjects) listBuckets(ctx context.Context) (bucketsInfo []BucketInfo, err error) {
for _, disk := range er.getLoadBalancedDisks() {
if disk == nil {
continue
}
var volsInfo []VolInfo
volsInfo, err = disk.ListVols()
if err == nil {
// NOTE: The assumption here is that volumes across all disks in
// readQuorum have consistent view i.e they all have same number
// of buckets. This is essentially not verified since healing
// should take care of this.
var bucketsInfo []BucketInfo
for _, volInfo := range volsInfo {
if isReservedOrInvalidBucket(volInfo.Name, true) {
continue
}
bucketsInfo = append(bucketsInfo, BucketInfo(volInfo))
}
// For buckets info empty, loop once again to check
// if we have, can happen if disks were down.
if len(bucketsInfo) == 0 {
continue
}
return bucketsInfo, nil
}
logger.LogIf(ctx, err)
// Ignore any disks not found.
if IsErrIgnored(err, bucketMetadataOpIgnoredErrs...) {
continue
}
break
}
return nil, err
}
// ListBuckets - lists all the buckets, sorted by its name.
func (er erasureObjects) ListBuckets(ctx context.Context) ([]BucketInfo, error) {
bucketInfos, err := er.listBuckets(ctx)
if err != nil {
return nil, toObjectErr(err)
}
// Sort by bucket name before returning.
sort.Sort(byBucketName(bucketInfos))
return bucketInfos, nil
}
// Dangling buckets should be handled appropriately, in this following situation
// we actually have quorum error to be `nil` but we have some disks where
// the bucket delete returned `errVolumeNotEmpty` but this is not correct
// can only happen if there are dangling objects in a bucket. Under such
// a situation we simply attempt a full delete of the bucket including
// the dangling objects. All of this happens under a lock and there
// is no way a user can create buckets and sneak in objects into namespace,
// so it is safer to do.
func deleteDanglingBucket(ctx context.Context, storageDisks []StorageAPI, dErrs []error, bucket string) {
for index, err := range dErrs {
if err == errVolumeNotEmpty {
// Attempt to delete bucket again.
if derr := storageDisks[index].DeleteVol(bucket, false); derr == errVolumeNotEmpty {
_ = cleanupDir(ctx, storageDisks[index], bucket, "")
_ = storageDisks[index].DeleteVol(bucket, false)
// Cleanup all the previously incomplete multiparts.
_ = cleanupDir(ctx, storageDisks[index], minioMetaMultipartBucket, bucket)
}
}
}
}
// DeleteBucket - deletes a bucket.
func (er erasureObjects) DeleteBucket(ctx context.Context, bucket string, forceDelete bool) error {
// Collect if all disks report volume not found.
storageDisks := er.getDisks()
g := errgroup.WithNErrs(len(storageDisks))
for index := range storageDisks {
index := index
g.Go(func() error {
if storageDisks[index] != nil {
if err := storageDisks[index].DeleteVol(bucket, forceDelete); err != nil {
return err
}
err := cleanupDir(ctx, storageDisks[index], minioMetaMultipartBucket, bucket)
if err != nil && err != errVolumeNotFound {
return err
}
return nil
}
return errDiskNotFound
}, index)
}
// Wait for all the delete vols to finish.
dErrs := g.Wait()
if forceDelete {
for _, err := range dErrs {
if err != nil {
undoDeleteBucket(storageDisks, bucket)
return toObjectErr(err, bucket)
}
}
return nil
}
writeQuorum := getWriteQuorum(len(storageDisks))
err := reduceWriteQuorumErrs(ctx, dErrs, bucketOpIgnoredErrs, writeQuorum)
if err == errErasureWriteQuorum {
undoDeleteBucket(storageDisks, bucket)
}
if err != nil {
return toObjectErr(err, bucket)
}
// If we reduce quorum to nil, means we have deleted buckets properly
// on some servers in quorum, we should look for volumeNotEmpty errors
// and delete those buckets as well.
deleteDanglingBucket(ctx, storageDisks, dErrs, bucket)
return nil
}
// IsNotificationSupported returns whether bucket notification is applicable for this layer.
func (er erasureObjects) IsNotificationSupported() bool {
return true
}
// IsListenBucketSupported returns whether listen bucket notification is applicable for this layer.
func (er erasureObjects) IsListenBucketSupported() bool {
return true
}
// IsEncryptionSupported returns whether server side encryption is implemented for this layer.
func (er erasureObjects) IsEncryptionSupported() bool {
return true
}
// IsCompressionSupported returns whether compression is applicable for this layer.
func (er erasureObjects) IsCompressionSupported() bool {
return true
}
// IsTaggingSupported indicates whether erasureObjects implements tagging support.
func (er erasureObjects) IsTaggingSupported() bool {
return true
}