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87 lines
2.7 KiB
87 lines
2.7 KiB
/*
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* MinIO Cloud Storage, (C) 2016, 2017 MinIO, Inc.
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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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package cmd
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import (
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"context"
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"path"
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"github.com/minio/minio/pkg/sync/errgroup"
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)
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// getLoadBalancedDisks - fetches load balanced (sufficiently randomized) disk slice.
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func (xl xlObjects) getLoadBalancedDisks() (newDisks []StorageAPI) {
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disks := xl.getDisks()
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// Based on the random shuffling return back randomized disks.
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for _, i := range hashOrder(UTCNow().String(), len(disks)) {
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newDisks = append(newDisks, disks[i-1])
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}
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return newDisks
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}
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// This function does the following check, suppose
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// object is "a/b/c/d", stat makes sure that objects ""a/b/c""
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// "a/b" and "a" do not exist.
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func (xl xlObjects) parentDirIsObject(ctx context.Context, bucket, parent string) bool {
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var isParentDirObject func(string) bool
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isParentDirObject = func(p string) bool {
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if p == "." || p == SlashSeparator {
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return false
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}
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if xl.isObject(bucket, p) {
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// If there is already a file at prefix "p", return true.
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return true
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}
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// Check if there is a file as one of the parent paths.
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return isParentDirObject(path.Dir(p))
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}
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return isParentDirObject(parent)
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}
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// isObject - returns `true` if the prefix is an object i.e if
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// `xl.json` exists at the leaf, false otherwise.
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func (xl xlObjects) isObject(bucket, prefix string) (ok bool) {
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storageDisks := xl.getDisks()
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g := errgroup.WithNErrs(len(storageDisks))
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for index := range storageDisks {
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index := index
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g.Go(func() error {
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if storageDisks[index] == nil {
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return errDiskNotFound
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}
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// Check if 'prefix' is an object on this 'disk', else continue the check the next disk
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fi, err := storageDisks[index].StatFile(bucket, pathJoin(prefix, xlMetaJSONFile))
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if err != nil {
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return err
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}
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if fi.Size == 0 {
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return errCorruptedFormat
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}
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return nil
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}, index)
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}
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// NOTE: Observe we are not trying to read `xl.json` and figure out the actual
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// quorum intentionally, but rely on the default case scenario. Actual quorum
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// verification will happen by top layer by using getObjectInfo() and will be
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// ignored if necessary.
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readQuorum := getReadQuorum(len(storageDisks))
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return reduceReadQuorumErrs(GlobalContext, g.Wait(), objectOpIgnoredErrs, readQuorum) == nil
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}
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