xl.json is the source of truth for all erasure coded objects, without which we won't be able to read the objects properly. This PR enables sync mode for writing `xl.json` such all writes go hit the disk and are persistent under situations such as abrupt power failures on servers running Minio.
174 lines
4.4 KiB
Go
174 lines
4.4 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 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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"sync"
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)
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// naughtyDisk wraps a POSIX disk and returns programmed errors
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// specified by the developer. The purpose is to simulate errors
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// that are hard to simulate in practice like DiskNotFound.
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// Programmed errors are stored in errors field.
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type naughtyDisk struct {
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// The real disk
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disk StorageAPI
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// Programmed errors: API call number => error to return
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errors map[int]error
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// The error to return when no error value is programmed
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defaultErr error
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// The current API call number
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callNR int
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// Data protection
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mu sync.Mutex
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}
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func newNaughtyDisk(d StorageAPI, errs map[int]error, defaultErr error) *naughtyDisk {
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return &naughtyDisk{disk: d, errors: errs, defaultErr: defaultErr}
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}
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func (d *naughtyDisk) String() string {
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return d.disk.String()
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}
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func (d *naughtyDisk) IsOnline() bool {
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if err := d.calcError(); err != nil {
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return err == errDiskNotFound
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}
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return d.disk.IsOnline()
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}
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func (d *naughtyDisk) LastError() (err error) {
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return nil
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}
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func (d *naughtyDisk) Close() (err error) {
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if err = d.calcError(); err != nil {
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return err
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}
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return d.disk.Close()
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}
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func (d *naughtyDisk) calcError() (err error) {
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d.mu.Lock()
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defer d.mu.Unlock()
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d.callNR++
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if err, ok := d.errors[d.callNR]; ok {
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return err
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}
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if d.defaultErr != nil {
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return d.defaultErr
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}
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return nil
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}
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func (d *naughtyDisk) DiskInfo() (info DiskInfo, err error) {
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if err := d.calcError(); err != nil {
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return info, err
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}
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return d.disk.DiskInfo()
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}
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func (d *naughtyDisk) MakeVol(volume string) (err error) {
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if err := d.calcError(); err != nil {
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return err
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}
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return d.disk.MakeVol(volume)
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}
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func (d *naughtyDisk) ListVols() (vols []VolInfo, err error) {
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if err := d.calcError(); err != nil {
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return nil, err
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}
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return d.disk.ListVols()
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}
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func (d *naughtyDisk) StatVol(volume string) (volInfo VolInfo, err error) {
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if err := d.calcError(); err != nil {
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return VolInfo{}, err
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}
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return d.disk.StatVol(volume)
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}
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func (d *naughtyDisk) DeleteVol(volume string) (err error) {
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if err := d.calcError(); err != nil {
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return err
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}
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return d.disk.DeleteVol(volume)
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}
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func (d *naughtyDisk) ListDir(volume, path string, count int) (entries []string, err error) {
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if err := d.calcError(); err != nil {
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return []string{}, err
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}
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return d.disk.ListDir(volume, path, count)
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}
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func (d *naughtyDisk) ReadFile(volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error) {
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if err := d.calcError(); err != nil {
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return 0, err
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}
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return d.disk.ReadFile(volume, path, offset, buf, verifier)
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}
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func (d *naughtyDisk) PrepareFile(volume, path string, length int64) error {
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if err := d.calcError(); err != nil {
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return err
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}
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return d.disk.PrepareFile(volume, path, length)
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}
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func (d *naughtyDisk) AppendFile(volume, path string, buf []byte) error {
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if err := d.calcError(); err != nil {
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return err
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}
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return d.disk.AppendFile(volume, path, buf)
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}
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func (d *naughtyDisk) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) error {
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if err := d.calcError(); err != nil {
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return err
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}
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return d.disk.RenameFile(srcVolume, srcPath, dstVolume, dstPath)
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}
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func (d *naughtyDisk) StatFile(volume string, path string) (file FileInfo, err error) {
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if err := d.calcError(); err != nil {
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return FileInfo{}, err
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}
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return d.disk.StatFile(volume, path)
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}
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func (d *naughtyDisk) DeleteFile(volume string, path string) (err error) {
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if err := d.calcError(); err != nil {
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return err
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}
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return d.disk.DeleteFile(volume, path)
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}
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func (d *naughtyDisk) WriteAll(volume string, path string, buf []byte) (err error) {
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if err := d.calcError(); err != nil {
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return err
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}
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return d.disk.WriteAll(volume, path, buf)
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}
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func (d *naughtyDisk) ReadAll(volume string, path string) (buf []byte, err error) {
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if err := d.calcError(); err != nil {
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return nil, err
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}
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return d.disk.ReadAll(volume, path)
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}
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