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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"
"time"
"github.com/minio/minio/pkg/bpool"
"github.com/minio/minio/pkg/disk"
"github.com/minio/minio/pkg/errors"
)
// XL constants.
const (
// XL metadata file carries per object metadata.
xlMetaJSONFile = "xl.json"
)
// 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
// Variable represents bucket policies in memory.
bucketPolicies *bucketPolicies
// 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
}
// list of all errors that can be ignored in tree walk operation in XL
var xlTreeWalkIgnoredErrs = append(baseIgnoredErrs, errDiskAccessDenied, errVolumeNotFound, errFileNotFound)
// Shutdown function for object storage interface.
func (xl xlObjects) Shutdown(ctx context.Context) error {
// Add any object layer shutdown activities here.
for _, disk := range xl.getDisks() {
// This closes storage rpc client connections if any.
// Otherwise this is a no-op.
if disk == nil {
continue
}
disk.Close()
}
return nil
}
// Locking operations
// List namespace locks held in object layer
func (xl xlObjects) ListLocks(ctx context.Context, bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error) {
xl.nsMutex.lockMapMutex.Lock()
defer xl.nsMutex.lockMapMutex.Unlock()
// Fetch current time once instead of fetching system time for every lock.
timeNow := UTCNow()
volumeLocks := []VolumeLockInfo{}
for param, debugLock := range xl.nsMutex.debugLockMap {
if param.volume != bucket {
continue
}
// N B empty prefix matches all param.path.
if !hasPrefix(param.path, prefix) {
continue
}
volLockInfo := VolumeLockInfo{
Bucket: param.volume,
Object: param.path,
LocksOnObject: debugLock.counters.total,
TotalBlockedLocks: debugLock.counters.blocked,
LocksAcquiredOnObject: debugLock.counters.granted,
}
// Filter locks that are held on bucket, prefix.
for opsID, lockInfo := range debugLock.lockInfo {
// filter locks that were held for longer than duration.
elapsed := timeNow.Sub(lockInfo.since)
if elapsed < duration {
continue
}
// Add locks that are held for longer than duration.
volLockInfo.LockDetailsOnObject = append(volLockInfo.LockDetailsOnObject,
OpsLockState{
OperationID: opsID,
LockSource: lockInfo.lockSource,
LockType: lockInfo.lType,
Status: lockInfo.status,
Since: lockInfo.since,
})
volumeLocks = append(volumeLocks, volLockInfo)
}
}
return volumeLocks, nil
}
// Clear namespace locks held in object layer
func (xl xlObjects) ClearLocks(ctx context.Context, volLocks []VolumeLockInfo) error {
// Remove lock matching bucket/prefix held longer than duration.
for _, volLock := range volLocks {
xl.nsMutex.ForceUnlock(volLock.Bucket, volLock.Object)
}
return nil
}
// byDiskTotal is a collection satisfying sort.Interface.
type byDiskTotal []disk.Info
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 []disk.Info, onlineDisks int, offlineDisks int) {
disksInfo = make([]disk.Info, 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 {
errorIf(err, "Unable to fetch disk info for %#v", storageDisk)
if errors.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 []disk.Info) []disk.Info {
var validDisksInfo []disk.Info
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{
Total: 0,
Free: 0,
}
}
_, sscParity := getRedundancyCount(standardStorageClass, len(disks))
_, rrscparity := getRedundancyCount(reducedRedundancyStorageClass, len(disks))
// Total number of online data drives available
// This is the number of drives we report free and total space for
availableDataDisks := uint64(onlineDisks - sscParity)
// Return calculated storage info, choose the lowest Total and
// Free as the total aggregated values. Total capacity is always
// the multiple of smallest disk among the disk list.
storageInfo := StorageInfo{
Total: validDisksInfo[0].Total * availableDataDisks,
Free: validDisksInfo[0].Free * availableDataDisks,
}
storageInfo.Backend.Type = Erasure
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())
}