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121 lines
3.6 KiB
121 lines
3.6 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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"sync"
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"github.com/minio/minio/cmd/logger"
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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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var xlTreeWalkIgnoredErrs = append(baseIgnoredErrs, errDiskAccessDenied, errVolumeNotFound, errFileNotFound)
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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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for _, disk := range xl.getLoadBalancedDisks() {
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if disk == nil {
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continue
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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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_, err := disk.StatFile(bucket, path.Join(prefix, xlMetaJSONFile))
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if err == nil {
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return true
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}
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// Ignore for file not found, disk not found or faulty disk.
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if IsErrIgnored(err, xlTreeWalkIgnoredErrs...) {
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continue
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}
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} // Exhausted all disks - return false.
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return false
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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 objectDirs = make([]bool, len(xl.getDisks()))
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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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objectDirs[index] = len(entries) == 0
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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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err := reduceReadQuorumErrs(context.Background(), errs, xlTreeWalkIgnoredErrs, readQuorum)
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if err != nil {
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reqInfo := &logger.ReqInfo{BucketName: bucket}
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reqInfo.AppendTags("prefix", prefix)
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ctx := logger.SetReqInfo(context.Background(), reqInfo)
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logger.LogIf(ctx, err)
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return false
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}
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for _, ok := range objectDirs {
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if !ok {
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// We perhaps found some entries in a prefix.
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return false
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}
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}
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// Return true if and only if the all directories are empty.
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return true
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}
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