2016-05-30 19:51:59 -04:00
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/*
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2019-08-19 14:35:52 -04:00
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* MinIO Cloud Storage, (C) 2016-2019 MinIO, Inc.
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2016-05-30 19:51:59 -04:00
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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2016-08-18 19:23:42 -04:00
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package cmd
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2016-05-25 19:42:31 -04:00
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import (
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2018-04-05 18:04:40 -04:00
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"context"
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2017-01-31 18:34:49 -05:00
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"errors"
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2016-07-08 10:33:21 -04:00
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"hash/crc32"
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2016-06-02 19:34:15 -04:00
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"path"
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2016-07-26 14:34:48 -04:00
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"sync"
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2016-09-09 01:38:18 -04:00
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2019-09-05 18:51:27 -04:00
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jsoniter "github.com/json-iterator/go"
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2018-04-05 18:04:40 -04:00
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"github.com/minio/minio/cmd/logger"
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2016-05-25 19:42:31 -04:00
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)
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2016-07-13 14:56:25 -04:00
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// Returns number of errors that occurred the most (incl. nil) and the
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2017-08-14 21:09:29 -04:00
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// corresponding error value. NB When there is more than one error value that
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2016-07-13 14:56:25 -04:00
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// occurs maximum number of times, the error value returned depends on how
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// golang's map orders keys. This doesn't affect correctness as long as quorum
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// value is greater than or equal to simple majority, since none of the equally
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// maximal values would occur quorum or more number of times.
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2016-11-21 04:47:26 -05:00
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func reduceErrs(errs []error, ignoredErrs []error) (maxCount int, maxErr error) {
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2016-07-13 14:56:25 -04:00
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errorCounts := make(map[error]int)
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2016-07-09 16:01:32 -04:00
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for _, err := range errs {
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2018-04-10 12:36:37 -04:00
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if IsErrIgnored(err, ignoredErrs...) {
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2016-07-19 22:24:32 -04:00
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continue
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}
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2016-07-13 14:56:25 -04:00
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errorCounts[err]++
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}
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2017-03-22 13:15:16 -04:00
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2016-07-09 16:01:32 -04:00
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max := 0
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for err, count := range errorCounts {
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switch {
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case max < count:
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max = count
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maxErr = err
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// Prefer `nil` over other error values with the same
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// number of occurrences.
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case max == count && err == nil:
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maxErr = err
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}
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}
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2016-11-21 04:47:26 -05:00
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return max, maxErr
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}
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// reduceQuorumErrs behaves like reduceErrs by only for returning
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// values of maximally occurring errors validated against a generic
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// quorum number that can be read or write quorum depending on usage.
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func reduceQuorumErrs(ctx context.Context, errs []error, ignoredErrs []error, quorum int, quorumErr error) error {
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maxCount, maxErr := reduceErrs(errs, ignoredErrs)
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if maxCount >= quorum {
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return maxErr
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}
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return quorumErr
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2016-11-21 04:47:26 -05:00
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}
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// reduceReadQuorumErrs behaves like reduceErrs but only for returning
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// values of maximally occurring errors validated against readQuorum.
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2018-04-05 18:04:40 -04:00
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func reduceReadQuorumErrs(ctx context.Context, errs []error, ignoredErrs []error, readQuorum int) (maxErr error) {
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return reduceQuorumErrs(ctx, errs, ignoredErrs, readQuorum, errXLReadQuorum)
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2016-11-21 04:47:26 -05:00
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}
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// reduceWriteQuorumErrs behaves like reduceErrs but only for returning
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// values of maximally occurring errors validated against writeQuorum.
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2018-04-05 18:04:40 -04:00
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func reduceWriteQuorumErrs(ctx context.Context, errs []error, ignoredErrs []error, writeQuorum int) (maxErr error) {
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return reduceQuorumErrs(ctx, errs, ignoredErrs, writeQuorum, errXLWriteQuorum)
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}
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2017-08-14 21:09:29 -04:00
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// Similar to 'len(slice)' but returns the actual elements count
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2016-06-17 14:57:51 -04:00
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// skipping the unallocated elements.
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func diskCount(disks []StorageAPI) int {
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diskCount := 0
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for _, disk := range disks {
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if disk == nil {
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continue
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}
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diskCount++
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}
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return diskCount
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}
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// hashOrder - hashes input key to return consistent
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// hashed integer slice. Returned integer order is salted
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// with an input key. This results in consistent order.
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// NOTE: collisions are fine, we are not looking for uniqueness
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// in the slices returned.
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func hashOrder(key string, cardinality int) []int {
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2018-02-15 20:45:57 -05:00
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if cardinality <= 0 {
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// Returns an empty int slice for cardinality < 0.
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return nil
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2016-05-25 19:42:31 -04:00
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}
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2018-02-15 20:45:57 -05:00
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2016-07-21 22:07:00 -04:00
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nums := make([]int, cardinality)
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keyCrc := crc32.Checksum([]byte(key), crc32.IEEETable)
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2016-07-08 10:33:21 -04:00
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2017-11-30 15:57:03 -05:00
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start := int(keyCrc % uint32(cardinality))
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2016-07-21 22:07:00 -04:00
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for i := 1; i <= cardinality; i++ {
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nums[i-1] = 1 + ((start + i) % cardinality)
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}
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2016-07-08 10:33:21 -04:00
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return nums
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2016-05-25 19:42:31 -04:00
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}
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2019-09-05 18:51:27 -04:00
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// Constructs xlMetaV1 using `jsoniter` lib.
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2019-08-19 14:35:52 -04:00
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func xlMetaV1UnmarshalJSON(ctx context.Context, xlMetaBuf []byte) (xlMeta xlMetaV1, err error) {
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2019-09-05 18:51:27 -04:00
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var json = jsoniter.ConfigCompatibleWithStandardLibrary
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err = json.Unmarshal(xlMetaBuf, &xlMeta)
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return xlMeta, err
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2016-09-09 01:38:18 -04:00
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}
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// read xl.json from the given disk, parse and return xlV1MetaV1.Parts.
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2019-01-05 17:16:43 -05:00
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func readXLMetaParts(ctx context.Context, disk StorageAPI, bucket string, object string) ([]ObjectPartInfo, map[string]string, error) {
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2016-09-09 01:38:18 -04:00
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// Reads entire `xl.json`.
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xlMetaBuf, err := disk.ReadAll(bucket, path.Join(object, xlMetaJSONFile))
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if err != nil {
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2018-04-05 18:04:40 -04:00
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logger.LogIf(ctx, err)
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return nil, nil, err
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2016-09-09 01:38:18 -04:00
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}
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2018-03-01 14:37:57 -05:00
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2019-08-19 14:35:52 -04:00
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var xlMeta xlMetaV1
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xlMeta, err = xlMetaV1UnmarshalJSON(ctx, xlMetaBuf)
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if err != nil {
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return nil, nil, err
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}
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2016-09-09 01:38:18 -04:00
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2019-08-19 14:35:52 -04:00
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return xlMeta.Parts, xlMeta.Meta, nil
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2016-09-09 01:38:18 -04:00
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}
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2019-09-05 18:51:27 -04:00
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// read xl.json from the given disk and parse xlV1Meta.Stat and xlV1Meta.Meta using jsoniter.
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func readXLMetaStat(ctx context.Context, disk StorageAPI, bucket string, object string) (si statInfo,
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mp map[string]string, e error) {
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// Reads entire `xl.json`.
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xlMetaBuf, err := disk.ReadAll(bucket, path.Join(object, xlMetaJSONFile))
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if err != nil {
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2018-04-05 18:04:40 -04:00
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logger.LogIf(ctx, err)
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return si, nil, err
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2016-09-09 01:38:18 -04:00
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}
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2019-08-19 14:35:52 -04:00
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var xlMeta xlMetaV1
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xlMeta, err = xlMetaV1UnmarshalJSON(ctx, xlMetaBuf)
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2016-09-09 01:38:18 -04:00
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if err != nil {
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2019-08-19 14:35:52 -04:00
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return si, mp, err
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2016-09-09 01:38:18 -04:00
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}
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2017-05-14 15:05:51 -04:00
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2016-09-09 01:38:18 -04:00
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// Return structured `xl.json`.
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return xlMeta.Stat, xlMeta.Meta, nil
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2016-09-09 01:38:18 -04:00
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}
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2016-06-25 17:51:06 -04:00
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// readXLMeta reads `xl.json` and returns back XL metadata structure.
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2018-04-05 18:04:40 -04:00
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func readXLMeta(ctx context.Context, disk StorageAPI, bucket string, object string) (xlMeta xlMetaV1, err error) {
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2016-06-24 05:06:23 -04:00
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// Reads entire `xl.json`.
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2016-09-09 01:38:18 -04:00
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xlMetaBuf, err := disk.ReadAll(bucket, path.Join(object, xlMetaJSONFile))
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2016-06-25 17:51:06 -04:00
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if err != nil {
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2018-10-30 19:07:57 -04:00
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if err != errFileNotFound && err != errVolumeNotFound {
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2018-09-14 00:42:50 -04:00
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logger.GetReqInfo(ctx).AppendTags("disk", disk.String())
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2018-04-25 14:46:49 -04:00
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logger.LogIf(ctx, err)
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}
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2018-04-05 18:04:40 -04:00
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return xlMetaV1{}, err
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2016-06-02 19:34:15 -04:00
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}
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2018-11-13 14:57:03 -05:00
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if len(xlMetaBuf) == 0 {
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return xlMetaV1{}, errFileNotFound
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}
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2018-04-05 18:04:40 -04:00
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xlMeta, err = xlMetaV1UnmarshalJSON(ctx, xlMetaBuf)
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2016-09-09 01:38:18 -04:00
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if err != nil {
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2018-08-20 19:58:47 -04:00
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logger.GetReqInfo(ctx).AppendTags("disk", disk.String())
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logger.LogIf(ctx, err)
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2018-04-05 18:04:40 -04:00
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return xlMetaV1{}, err
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2016-05-25 19:42:31 -04:00
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}
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2016-06-24 05:06:23 -04:00
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// Return structured `xl.json`.
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return xlMeta, nil
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2016-05-25 19:42:31 -04:00
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}
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2016-07-12 21:23:40 -04:00
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2016-07-26 14:34:48 -04:00
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// Reads all `xl.json` metadata as a xlMetaV1 slice.
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// Returns error slice indicating the failed metadata reads.
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2018-04-05 18:04:40 -04:00
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func readAllXLMetadata(ctx context.Context, disks []StorageAPI, bucket, object string) ([]xlMetaV1, []error) {
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2016-07-26 14:34:48 -04:00
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errs := make([]error, len(disks))
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metadataArray := make([]xlMetaV1, len(disks))
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var wg = &sync.WaitGroup{}
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// Read `xl.json` parallelly across disks.
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for index, disk := range disks {
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if disk == nil {
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errs[index] = errDiskNotFound
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continue
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}
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wg.Add(1)
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// Read `xl.json` in routine.
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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var err error
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2018-04-05 18:04:40 -04:00
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metadataArray[index], err = readXLMeta(ctx, disk, bucket, object)
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2016-07-26 14:34:48 -04:00
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if err != nil {
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errs[index] = err
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return
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}
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}(index, disk)
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}
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// Wait for all the routines to finish.
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wg.Wait()
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// Return all the metadata.
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return metadataArray, errs
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}
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2017-02-24 12:20:40 -05:00
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// Return shuffled partsMetadata depending on distribution.
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func shufflePartsMetadata(partsMetadata []xlMetaV1, distribution []int) (shuffledPartsMetadata []xlMetaV1) {
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if distribution == nil {
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return partsMetadata
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}
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shuffledPartsMetadata = make([]xlMetaV1, len(partsMetadata))
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// Shuffle slice xl metadata for expected distribution.
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2016-07-16 11:35:30 -04:00
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for index := range partsMetadata {
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blockIndex := distribution[index]
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2017-02-24 12:20:40 -05:00
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shuffledPartsMetadata[blockIndex-1] = partsMetadata[index]
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2016-07-16 11:35:30 -04:00
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}
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2017-02-24 12:20:40 -05:00
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return shuffledPartsMetadata
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2016-07-16 11:35:30 -04:00
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}
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2017-02-24 12:20:40 -05:00
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// shuffleDisks - shuffle input disks slice depending on the
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2017-08-14 21:09:29 -04:00
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// erasure distribution. Return shuffled slice of disks with
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2017-02-24 12:20:40 -05:00
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// their expected distribution.
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func shuffleDisks(disks []StorageAPI, distribution []int) (shuffledDisks []StorageAPI) {
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if distribution == nil {
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return disks
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}
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shuffledDisks = make([]StorageAPI, len(disks))
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// Shuffle disks for expected distribution.
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2016-07-16 11:35:30 -04:00
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for index := range disks {
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blockIndex := distribution[index]
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2017-02-24 12:20:40 -05:00
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shuffledDisks[blockIndex-1] = disks[index]
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2016-07-16 11:35:30 -04:00
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}
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2017-02-24 12:20:40 -05:00
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return shuffledDisks
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2016-07-16 11:35:30 -04:00
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}
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2017-01-30 18:44:42 -05:00
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2017-06-14 20:14:27 -04:00
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// evalDisks - returns a new slice of disks where nil is set if
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2017-08-14 21:09:29 -04:00
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// the corresponding error in errs slice is not nil
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2017-06-14 20:14:27 -04:00
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func evalDisks(disks []StorageAPI, errs []error) []StorageAPI {
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if len(errs) != len(disks) {
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2018-04-05 18:04:40 -04:00
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logger.LogIf(context.Background(), errors.New("unexpected disks/errors slice length"))
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2017-06-14 20:14:27 -04:00
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return nil
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}
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newDisks := make([]StorageAPI, len(disks))
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for index := range errs {
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if errs[index] == nil {
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newDisks[index] = disks[index]
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} else {
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newDisks[index] = nil
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}
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}
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return newDisks
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}
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2017-10-06 12:38:01 -04:00
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// Errors specifically generated by calculatePartSizeFromIdx function.
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2017-01-31 18:34:49 -05:00
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var (
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errPartSizeZero = errors.New("Part size cannot be zero")
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errPartSizeIndex = errors.New("Part index cannot be smaller than 1")
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)
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2017-10-06 12:38:01 -04:00
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// calculatePartSizeFromIdx calculates the part size according to input index.
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// returns error if totalSize is -1, partSize is 0, partIndex is 0.
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2018-04-05 18:04:40 -04:00
|
|
|
func calculatePartSizeFromIdx(ctx context.Context, totalSize int64, partSize int64, partIndex int) (currPartSize int64, err error) {
|
2018-09-27 23:36:17 -04:00
|
|
|
if totalSize < -1 {
|
2018-04-05 18:04:40 -04:00
|
|
|
logger.LogIf(ctx, errInvalidArgument)
|
|
|
|
return 0, errInvalidArgument
|
2017-10-06 12:38:01 -04:00
|
|
|
}
|
2017-01-30 18:44:42 -05:00
|
|
|
if partSize == 0 {
|
2018-04-05 18:04:40 -04:00
|
|
|
logger.LogIf(ctx, errPartSizeZero)
|
|
|
|
return 0, errPartSizeZero
|
2017-01-30 18:44:42 -05:00
|
|
|
}
|
|
|
|
if partIndex < 1 {
|
2018-04-05 18:04:40 -04:00
|
|
|
logger.LogIf(ctx, errPartSizeIndex)
|
|
|
|
return 0, errPartSizeIndex
|
2017-01-30 18:44:42 -05:00
|
|
|
}
|
2019-04-30 19:27:31 -04:00
|
|
|
if totalSize == -1 {
|
|
|
|
return -1, nil
|
|
|
|
}
|
2017-10-06 12:38:01 -04:00
|
|
|
if totalSize > 0 {
|
|
|
|
// Compute the total count of parts
|
|
|
|
partsCount := totalSize/partSize + 1
|
|
|
|
// Return the part's size
|
|
|
|
switch {
|
|
|
|
case int64(partIndex) < partsCount:
|
|
|
|
currPartSize = partSize
|
|
|
|
case int64(partIndex) == partsCount:
|
|
|
|
// Size of last part
|
|
|
|
currPartSize = totalSize % partSize
|
|
|
|
default:
|
|
|
|
currPartSize = 0
|
|
|
|
}
|
2017-01-30 18:44:42 -05:00
|
|
|
}
|
2017-10-06 12:38:01 -04:00
|
|
|
return currPartSize, nil
|
2017-01-30 18:44:42 -05:00
|
|
|
}
|