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minio/cmd/xl-v1.go

203 lines
5.6 KiB

/*
* 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"
"strings"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/bpool"
"github.com/minio/minio/pkg/dsync"
"github.com/minio/minio/pkg/madmin"
xnet "github.com/minio/minio/pkg/net"
"github.com/minio/minio/pkg/sync/errgroup"
)
// 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 {
// getDisks returns list of storageAPIs.
getDisks func() []StorageAPI
// getLockers returns list of remote and local lockers.
getLockers func() []dsync.NetLocker
// Locker mutex map.
nsMutex *nsLockMap
// Byte pools used for temporary i/o buffers.
bp *bpool.BytePoolCap
// TODO: ListObjects pool management, should be removed in future.
listPool *TreeWalkPool
}
// NewNSLock - initialize a new namespace RWLocker instance.
func (xl xlObjects) NewNSLock(ctx context.Context, bucket string, object string) RWLocker {
return xl.nsMutex.NewNSLock(ctx, xl.getLockers, bucket, object)
}
// Shutdown function for object storage interface.
func (xl xlObjects) Shutdown(ctx context.Context) error {
// Add any object layer shutdown activities here.
closeStorageDisks(xl.getDisks())
closeLockers(xl.getLockers())
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, offlineDisks madmin.BackendDisks) {
disksInfo = make([]DiskInfo, len(disks))
g := errgroup.WithNErrs(len(disks))
for index := range disks {
index := index
g.Go(func() error {
if disks[index] == nil {
// Storage disk is empty, perhaps ignored disk or not available.
return errDiskNotFound
}
info, err := disks[index].DiskInfo()
if err != nil {
if IsErr(err, baseErrs...) {
return err
}
reqInfo := (&logger.ReqInfo{}).AppendTags("disk", disks[index].String())
ctx := logger.SetReqInfo(context.Background(), reqInfo)
logger.LogIf(ctx, err)
}
disksInfo[index] = info
return nil
}, index)
}
getPeerAddress := func(diskPath string) (string, error) {
hostPort := strings.Split(diskPath, SlashSeparator)[0]
// Host will be empty for xl/fs disk paths.
if hostPort == "" {
return "", nil
}
thisAddr, err := xnet.ParseHost(hostPort)
if err != nil {
return "", err
}
return thisAddr.String(), nil
}
onlineDisks = make(madmin.BackendDisks)
offlineDisks = make(madmin.BackendDisks)
// Wait for the routines.
for i, err := range g.Wait() {
peerAddr, pErr := getPeerAddress(disksInfo[i].RelativePath)
if pErr != nil {
continue
}
if _, ok := offlineDisks[peerAddr]; !ok {
offlineDisks[peerAddr] = 0
}
if _, ok := onlineDisks[peerAddr]; !ok {
onlineDisks[peerAddr] = 0
}
if err != nil {
offlineDisks[peerAddr]++
continue
}
onlineDisks[peerAddr]++
}
// 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
usedList := make([]uint64, len(validDisksInfo))
totalList := make([]uint64, len(validDisksInfo))
availableList := make([]uint64, len(validDisksInfo))
mountPaths := make([]string, len(validDisksInfo))
for i, di := range validDisksInfo {
usedList[i] = di.Used
totalList[i] = di.Total
availableList[i] = di.Free
mountPaths[i] = di.RelativePath
}
storageInfo := StorageInfo{
Used: usedList,
Total: totalList,
Available: availableList,
MountPaths: mountPaths,
}
storageInfo.Backend.Type = BackendErasure
storageInfo.Backend.OnlineDisks = onlineDisks
storageInfo.Backend.OfflineDisks = offlineDisks
return storageInfo
}
// StorageInfo - returns underlying storage statistics.
func (xl xlObjects) StorageInfo(ctx context.Context) StorageInfo {
return getStorageInfo(xl.getDisks())
}