mirror of https://github.com/minio/minio.git
119 lines
3.5 KiB
Go
119 lines
3.5 KiB
Go
/*
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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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"sync"
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)
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// getLoadBalancedDisks - fetches load balanced (sufficiently randomized) disk slice.
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func (xl xlObjects) getLoadBalancedDisks() (disks []StorageAPI) {
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// Based on the random shuffling return back randomized disks.
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for _, i := range hashOrder(UTCNow().String(), len(xl.getDisks())) {
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disks = append(disks, xl.getDisks()[i-1])
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}
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return disks
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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 == "/" {
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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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var errs = make([]error, len(xl.getDisks()))
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var wg sync.WaitGroup
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for index, disk := range xl.getDisks() {
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if disk == nil {
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continue
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}
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wg.Add(1)
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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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 := disk.StatFile(bucket, path.Join(prefix, xlMetaJSONFile))
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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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if fi.Size == 0 {
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errs[index] = errCorruptedFormat
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return
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}
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}(index, disk)
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}
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wg.Wait()
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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 := len(xl.getDisks()) / 2
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return reduceReadQuorumErrs(context.Background(), errs, objectOpIgnoredErrs, readQuorum) == nil
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}
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// isObjectDir returns if the specified path represents an empty directory.
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func (xl xlObjects) isObjectDir(bucket, prefix string) (ok bool) {
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var errs = make([]error, len(xl.getDisks()))
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var wg sync.WaitGroup
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for index, disk := range xl.getDisks() {
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if disk == nil {
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continue
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}
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wg.Add(1)
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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// Check if 'prefix' is an object on this 'disk', else continue the check the next disk
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entries, err := disk.ListDir(bucket, prefix, 1)
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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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if len(entries) > 0 {
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errs[index] = errVolumeNotEmpty
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return
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}
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}(index, disk)
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}
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wg.Wait()
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readQuorum := len(xl.getDisks()) / 2
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return reduceReadQuorumErrs(context.Background(), errs, objectOpIgnoredErrs, readQuorum) == nil
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}
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