148 lines
4.2 KiB
Go
148 lines
4.2 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016, 2017, 2018 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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"sort"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/bpool"
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)
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// XL constants.
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const (
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// XL metadata file carries per object metadata.
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xlMetaJSONFile = "xl.json"
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)
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// OfflineDisk represents an unavailable disk.
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var OfflineDisk StorageAPI // zero value is nil
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// xlObjects - Implements XL object layer.
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type xlObjects struct {
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// name space mutex for object layer.
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nsMutex *nsLockMap
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// getDisks returns list of storageAPIs.
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getDisks func() []StorageAPI
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// Byte pools used for temporary i/o buffers.
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bp *bpool.BytePoolCap
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// TODO: Deprecated only kept here for tests, should be removed in future.
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storageDisks []StorageAPI
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// TODO: ListObjects pool management, should be removed in future.
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listPool *treeWalkPool
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}
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// Shutdown function for object storage interface.
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func (xl xlObjects) Shutdown(ctx context.Context) error {
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// Add any object layer shutdown activities here.
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closeStorageDisks(xl.getDisks())
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return nil
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}
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// byDiskTotal is a collection satisfying sort.Interface.
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type byDiskTotal []DiskInfo
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func (d byDiskTotal) Len() int { return len(d) }
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func (d byDiskTotal) Swap(i, j int) { d[i], d[j] = d[j], d[i] }
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func (d byDiskTotal) Less(i, j int) bool {
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return d[i].Total < d[j].Total
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}
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// getDisksInfo - fetch disks info across all other storage API.
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func getDisksInfo(disks []StorageAPI) (disksInfo []DiskInfo, onlineDisks int, offlineDisks int) {
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disksInfo = make([]DiskInfo, len(disks))
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for i, storageDisk := range disks {
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if storageDisk == nil {
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// Storage disk is empty, perhaps ignored disk or not available.
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offlineDisks++
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continue
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}
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info, err := storageDisk.DiskInfo()
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if err != nil {
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ctx := context.Background()
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logger.GetReqInfo(ctx).AppendTags("disk", storageDisk.String())
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logger.LogIf(ctx, err)
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if IsErr(err, baseErrs...) {
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offlineDisks++
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continue
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}
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}
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onlineDisks++
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disksInfo[i] = info
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}
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// Success.
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return disksInfo, onlineDisks, offlineDisks
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}
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// returns sorted disksInfo slice which has only valid entries.
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// i.e the entries where the total size of the disk is not stated
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// as 0Bytes, this means that the disk is not online or ignored.
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func sortValidDisksInfo(disksInfo []DiskInfo) []DiskInfo {
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var validDisksInfo []DiskInfo
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for _, diskInfo := range disksInfo {
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if diskInfo.Total == 0 {
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continue
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}
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validDisksInfo = append(validDisksInfo, diskInfo)
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}
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sort.Sort(byDiskTotal(validDisksInfo))
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return validDisksInfo
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}
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// Get an aggregated storage info across all disks.
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func getStorageInfo(disks []StorageAPI) StorageInfo {
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disksInfo, onlineDisks, offlineDisks := getDisksInfo(disks)
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// Sort so that the first element is the smallest.
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validDisksInfo := sortValidDisksInfo(disksInfo)
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// If there are no valid disks, set total and free disks to 0
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if len(validDisksInfo) == 0 {
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return StorageInfo{}
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}
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// Combine all disks to get total usage.
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var used uint64
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for _, di := range validDisksInfo {
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used = used + di.Used
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}
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_, sscParity := getRedundancyCount(standardStorageClass, len(disks))
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_, rrscparity := getRedundancyCount(reducedRedundancyStorageClass, len(disks))
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storageInfo := StorageInfo{
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Used: used,
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}
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storageInfo.Backend.Type = BackendErasure
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storageInfo.Backend.OnlineDisks = onlineDisks
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storageInfo.Backend.OfflineDisks = offlineDisks
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storageInfo.Backend.StandardSCParity = sscParity
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storageInfo.Backend.RRSCParity = rrscparity
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return storageInfo
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}
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// StorageInfo - returns underlying storage statistics.
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func (xl xlObjects) StorageInfo(ctx context.Context) StorageInfo {
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return getStorageInfo(xl.getDisks())
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}
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