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minio/xl-v1-bucket.go

270 lines
6.8 KiB

/*
* Minio Cloud Storage, (C) 2016 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 main
import (
"sort"
"sync"
)
/// Bucket operations
// MakeBucket - make a bucket.
func (xl xlObjects) MakeBucket(bucket string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
nsMutex.Lock(bucket, "")
defer nsMutex.Unlock(bucket, "")
// Initialize sync waitgroup.
var wg = &sync.WaitGroup{}
// Initialize list of errors.
var dErrs = make([]error, len(xl.storageDisks))
// Make a volume entry on all underlying storage disks.
for index, disk := range xl.storageDisks {
if disk == nil {
dErrs[index] = errDiskNotFound
continue
}
wg.Add(1)
// Make a volume inside a go-routine.
go func(index int, disk StorageAPI) {
defer wg.Done()
err := disk.MakeVol(bucket)
if err != nil {
dErrs[index] = err
}
}(index, disk)
}
// Wait for all make vol to finish.
wg.Wait()
// Do we have write quorum?.
if !isQuorum(dErrs, xl.writeQuorum) {
// Purge successfully created buckets if we don't have writeQuorum.
xl.undoMakeBucket(bucket)
return toObjectErr(errXLWriteQuorum, bucket)
}
// Verify we have any other errors which should undo make bucket.
for _, err := range dErrs {
// Bucket already exists, return BucketExists error.
if err == errVolumeExists {
return toObjectErr(errVolumeExists, bucket)
}
// Undo make bucket for any other errors.
if err != nil && err != errDiskNotFound {
xl.undoMakeBucket(bucket)
return toObjectErr(err, bucket)
}
}
return nil
}
// undo make bucket operation upon quorum failure.
func (xl xlObjects) undoMakeBucket(bucket string) {
// Initialize sync waitgroup.
var wg = &sync.WaitGroup{}
// Undo previous make bucket entry on all underlying storage disks.
for index, disk := range xl.storageDisks {
if disk == nil {
continue
}
wg.Add(1)
// Delete a bucket inside a go-routine.
go func(index int, disk StorageAPI) {
defer wg.Done()
_ = disk.DeleteVol(bucket)
}(index, disk)
}
// Wait for all make vol to finish.
wg.Wait()
}
// list all errors that can be ignored in a bucket metadata operation.
var bucketMetadataOpIgnoredErrs = []error{
errDiskNotFound,
errDiskAccessDenied,
errFaultyDisk,
}
// getBucketInfo - returns the BucketInfo from one of the load balanced disks.
func (xl xlObjects) getBucketInfo(bucketName string) (bucketInfo BucketInfo, err error) {
for _, disk := range xl.getLoadBalancedQuorumDisks() {
if disk == nil {
continue
}
var volInfo VolInfo
volInfo, err = disk.StatVol(bucketName)
if err == nil {
bucketInfo = BucketInfo{
Name: volInfo.Name,
Created: volInfo.Created,
}
return bucketInfo, nil
}
// For any reason disk went offline continue and pick the next one.
if isErrIgnored(err, bucketMetadataOpIgnoredErrs) {
continue
}
break
}
return BucketInfo{}, err
}
// Checks whether bucket exists.
func (xl xlObjects) isBucketExist(bucket string) bool {
nsMutex.RLock(bucket, "")
defer nsMutex.RUnlock(bucket, "")
// Check whether bucket exists.
_, err := xl.getBucketInfo(bucket)
if err != nil {
if err == errVolumeNotFound {
return false
}
errorIf(err, "Stat failed on bucket "+bucket+".")
return false
}
return true
}
// GetBucketInfo - returns BucketInfo for a bucket.
func (xl xlObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketInfo{}, BucketNameInvalid{Bucket: bucket}
}
nsMutex.RLock(bucket, "")
defer nsMutex.RUnlock(bucket, "")
bucketInfo, err := xl.getBucketInfo(bucket)
if err != nil {
return BucketInfo{}, toObjectErr(err, bucket)
}
return bucketInfo, nil
}
// listBuckets - returns list of all buckets from a disk picked at random.
func (xl xlObjects) listBuckets() (bucketsInfo []BucketInfo, err error) {
for _, disk := range xl.getLoadBalancedQuorumDisks() {
if disk == nil {
continue
}
var volsInfo []VolInfo
volsInfo, err = disk.ListVols()
if err == nil {
// NOTE: The assumption here is that volumes across all disks in
// readQuorum have consistent view i.e they all have same number
// of buckets. This is essentially not verified since healing
// should take care of this.
var bucketsInfo []BucketInfo
for _, volInfo := range volsInfo {
// StorageAPI can send volume names which are incompatible
// with buckets, handle it and skip them.
if !IsValidBucketName(volInfo.Name) {
continue
}
bucketsInfo = append(bucketsInfo, BucketInfo{
Name: volInfo.Name,
Created: volInfo.Created,
})
}
return bucketsInfo, nil
}
// Ignore any disks not found.
if isErrIgnored(err, bucketMetadataOpIgnoredErrs) {
continue
}
break
}
return nil, err
}
// ListBuckets - lists all the buckets, sorted by its name.
func (xl xlObjects) ListBuckets() ([]BucketInfo, error) {
bucketInfos, err := xl.listBuckets()
if err != nil {
return nil, toObjectErr(err)
}
// Sort by bucket name before returning.
sort.Sort(byBucketName(bucketInfos))
return bucketInfos, nil
}
// DeleteBucket - deletes a bucket.
func (xl xlObjects) DeleteBucket(bucket string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
nsMutex.Lock(bucket, "")
defer nsMutex.Unlock(bucket, "")
// Collect if all disks report volume not found.
var volumeNotFoundErrCnt int
var wg = &sync.WaitGroup{}
var dErrs = make([]error, len(xl.storageDisks))
// Remove a volume entry on all underlying storage disks.
for index, disk := range xl.storageDisks {
if disk == nil {
dErrs[index] = errDiskNotFound
continue
}
wg.Add(1)
// Delete volume inside a go-routine.
go func(index int, disk StorageAPI) {
defer wg.Done()
err := disk.DeleteVol(bucket)
if err != nil {
dErrs[index] = err
}
}(index, disk)
}
// Wait for all the delete vols to finish.
wg.Wait()
// Count the errors for known errors, return quickly if we found
// an unknown error.
for _, err := range dErrs {
if err != nil {
if isErrIgnored(err, objMetadataOpIgnoredErrs) {
volumeNotFoundErrCnt++
continue
}
return toObjectErr(err, bucket)
}
}
// Return errVolumeNotFound if all disks report volume not found.
if volumeNotFoundErrCnt == len(xl.storageDisks) {
return toObjectErr(errVolumeNotFound, bucket)
}
return nil
}