/
xl-v1.go
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/
xl-v1.go
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/*
* Minio Cloud Storage, (C) 2016, 2017, 2018 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"context"
"sort"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/bpool"
)
// XL constants.
const (
// XL metadata file carries per object metadata.
xlMetaJSONFile = "xl.json"
)
// OfflineDisk represents an unavailable disk.
var OfflineDisk StorageAPI // zero value is nil
// xlObjects - Implements XL object layer.
type xlObjects struct {
// name space mutex for object layer.
nsMutex *nsLockMap
// getDisks returns list of storageAPIs.
getDisks func() []StorageAPI
// Byte pools used for temporary i/o buffers.
bp *bpool.BytePoolCap
// TODO: Deprecated only kept here for tests, should be removed in future.
storageDisks []StorageAPI
// TODO: ListObjects pool management, should be removed in future.
listPool *treeWalkPool
}
// Shutdown function for object storage interface.
func (xl xlObjects) Shutdown(ctx context.Context) error {
// Add any object layer shutdown activities here.
closeStorageDisks(xl.getDisks())
return nil
}
// byDiskTotal is a collection satisfying sort.Interface.
type byDiskTotal []DiskInfo
func (d byDiskTotal) Len() int { return len(d) }
func (d byDiskTotal) Swap(i, j int) { d[i], d[j] = d[j], d[i] }
func (d byDiskTotal) Less(i, j int) bool {
return d[i].Total < d[j].Total
}
// getDisksInfo - fetch disks info across all other storage API.
func getDisksInfo(disks []StorageAPI) (disksInfo []DiskInfo, onlineDisks int, offlineDisks int) {
disksInfo = make([]DiskInfo, len(disks))
for i, storageDisk := range disks {
if storageDisk == nil {
// Storage disk is empty, perhaps ignored disk or not available.
offlineDisks++
continue
}
info, err := storageDisk.DiskInfo()
if err != nil {
ctx := context.Background()
logger.GetReqInfo(ctx).AppendTags("disk", storageDisk.String())
logger.LogIf(ctx, err)
if IsErr(err, baseErrs...) {
offlineDisks++
continue
}
}
onlineDisks++
disksInfo[i] = info
}
// Success.
return disksInfo, onlineDisks, offlineDisks
}
// returns sorted disksInfo slice which has only valid entries.
// i.e the entries where the total size of the disk is not stated
// as 0Bytes, this means that the disk is not online or ignored.
func sortValidDisksInfo(disksInfo []DiskInfo) []DiskInfo {
var validDisksInfo []DiskInfo
for _, diskInfo := range disksInfo {
if diskInfo.Total == 0 {
continue
}
validDisksInfo = append(validDisksInfo, diskInfo)
}
sort.Sort(byDiskTotal(validDisksInfo))
return validDisksInfo
}
// Get an aggregated storage info across all disks.
func getStorageInfo(disks []StorageAPI) StorageInfo {
disksInfo, onlineDisks, offlineDisks := getDisksInfo(disks)
// Sort so that the first element is the smallest.
validDisksInfo := sortValidDisksInfo(disksInfo)
// If there are no valid disks, set total and free disks to 0
if len(validDisksInfo) == 0 {
return StorageInfo{}
}
// Combine all disks to get total usage.
var used uint64
for _, di := range validDisksInfo {
used = used + di.Used
}
_, sscParity := getRedundancyCount(standardStorageClass, len(disks))
_, rrscparity := getRedundancyCount(reducedRedundancyStorageClass, len(disks))
storageInfo := StorageInfo{
Used: used,
}
storageInfo.Backend.Type = BackendErasure
storageInfo.Backend.OnlineDisks = onlineDisks
storageInfo.Backend.OfflineDisks = offlineDisks
storageInfo.Backend.StandardSCParity = sscParity
storageInfo.Backend.RRSCParity = rrscparity
return storageInfo
}
// StorageInfo - returns underlying storage statistics.
func (xl xlObjects) StorageInfo(ctx context.Context) StorageInfo {
return getStorageInfo(xl.getDisks())
}