mirror of https://github.com/minio/minio.git
628 lines
16 KiB
Go
628 lines
16 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 main
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import (
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"io"
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"os"
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"path"
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"path/filepath"
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"strings"
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"syscall"
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"github.com/Sirupsen/logrus"
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"github.com/minio/minio/pkg/disk"
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"github.com/minio/minio/pkg/safe"
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)
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const (
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fsMinSpacePercent = 5
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)
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// fsStorage - implements StorageAPI interface.
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type fsStorage struct {
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diskPath string
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minFreeDisk int64
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}
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// isDirEmpty - returns whether given directory is empty or not.
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func isDirEmpty(dirname string) (status bool, err error) {
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f, err := os.Open(dirname)
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if err == nil {
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defer f.Close()
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if _, err = f.Readdirnames(1); err == io.EOF {
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status = true
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err = nil
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}
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}
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return status, err
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}
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// isDirExist - returns whether given directory exists or not.
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func isDirExist(dirname string) (bool, error) {
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fi, e := os.Stat(dirname)
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if e != nil {
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if os.IsNotExist(e) {
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return false, nil
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}
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return false, e
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}
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return fi.IsDir(), nil
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}
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// Initialize a new storage disk.
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func newPosix(diskPath string) (StorageAPI, error) {
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if diskPath == "" {
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log.Debug("Disk cannot be empty")
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return nil, errInvalidArgument
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}
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st, err := os.Stat(diskPath)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": diskPath,
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}).Debugf("Stat failed, with error %s.", err)
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return nil, err
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}
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if !st.IsDir() {
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log.WithFields(logrus.Fields{
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"diskPath": diskPath,
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}).Debugf("Disk %s.", syscall.ENOTDIR)
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return nil, syscall.ENOTDIR
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}
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fs := fsStorage{
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diskPath: diskPath,
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minFreeDisk: fsMinSpacePercent, // Minimum 5% disk should be free.
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}
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log.WithFields(logrus.Fields{
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"diskPath": diskPath,
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"minFreeDisk": fsMinSpacePercent,
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}).Debugf("Successfully configured FS storage API.")
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return fs, nil
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}
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// checkDiskFree verifies if disk path has sufficient minium free disk
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// space.
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func checkDiskFree(diskPath string, minFreeDisk int64) (err error) {
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di, err := disk.GetInfo(diskPath)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": diskPath,
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}).Debugf("Failed to get disk info, %s", err)
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return err
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}
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// Remove 5% from total space for cumulative disk
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// space used for journalling, inodes etc.
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availableDiskSpace := (float64(di.Free) / (float64(di.Total) - (0.05 * float64(di.Total)))) * 100
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if int64(availableDiskSpace) <= minFreeDisk {
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log.WithFields(logrus.Fields{
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"availableDiskSpace": int64(availableDiskSpace),
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"minFreeDiskSpace": minFreeDisk,
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}).Debugf("Disk free space has reached its limit.")
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return errDiskFull
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}
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// Success.
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return nil
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}
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func removeDuplicateVols(volsInfo []VolInfo) []VolInfo {
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// Use map to record duplicates as we find them.
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result := []VolInfo{}
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m := make(map[string]VolInfo)
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for _, v := range volsInfo {
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if _, found := m[v.Name]; !found {
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m[v.Name] = v
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}
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}
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result = make([]VolInfo, 0, len(m))
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for _, v := range m {
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result = append(result, v)
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}
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// Return the new slice.
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return result
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}
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// gets all the unique directories from diskPath.
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func getAllUniqueVols(dirPath string) ([]VolInfo, error) {
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entries, err := readDir(dirPath)
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if err != nil {
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log.WithFields(logrus.Fields{
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"dirPath": dirPath,
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}).Debugf("readDir failed with error %s", err)
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return nil, err
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}
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var volsInfo []VolInfo
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for _, entry := range entries {
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if !strings.HasSuffix(entry, slashSeparator) || !isValidVolname(filepath.Clean(entry)) {
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// Skip if entry is neither a directory not a valid volume name.
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continue
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}
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fi, err := os.Stat(pathJoin(dirPath, entry))
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if err != nil {
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log.WithFields(logrus.Fields{
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"path": pathJoin(dirPath, entry),
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}).Debugf("Stat failed with error %s", err)
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return nil, err
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}
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volsInfo = append(volsInfo, VolInfo{
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Name: fi.Name(),
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// As os.Stat() doesn't carry other than ModTime(), use
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// ModTime() as CreatedTime.
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Created: fi.ModTime(),
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})
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}
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return removeDuplicateVols(volsInfo), nil
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}
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// getVolumeDir - will convert incoming volume names to
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// corresponding valid volume names on the backend in a platform
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// compatible way for all operating systems. If volume is not found
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// an error is generated.
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func (s fsStorage) getVolumeDir(volume string) (string, error) {
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if !isValidVolname(volume) {
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return "", errInvalidArgument
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}
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volumeDir := pathJoin(s.diskPath, volume)
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_, err := os.Stat(volumeDir)
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if err == nil {
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return volumeDir, nil
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}
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if os.IsNotExist(err) {
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var volsInfo []VolInfo
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volsInfo, err = getAllUniqueVols(s.diskPath)
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if err != nil {
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return volumeDir, errVolumeNotFound
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}
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for _, vol := range volsInfo {
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// Verify if lowercase version of the volume is equal to
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// the incoming volume, then use the proper name.
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if strings.ToLower(vol.Name) == volume {
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volumeDir = pathJoin(s.diskPath, vol.Name)
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return volumeDir, nil
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}
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}
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return volumeDir, errVolumeNotFound
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} else if os.IsPermission(err) {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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}).Debugf("Stat failed with error %s", err)
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return volumeDir, errVolumeAccessDenied
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}
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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}).Debugf("Stat failed with error %s", err)
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return volumeDir, err
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}
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// Make a volume entry.
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func (s fsStorage) MakeVol(volume string) (err error) {
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// Validate if disk is free.
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if err = checkDiskFree(s.diskPath, s.minFreeDisk); err != nil {
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return err
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}
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volumeDir, err := s.getVolumeDir(volume)
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if err == nil {
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// Volume already exists, return error.
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return errVolumeExists
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}
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// If volume not found create it.
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if err == errVolumeNotFound {
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// Make a volume entry.
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return os.Mkdir(volumeDir, 0700)
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}
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("MakeVol failed with %s", err)
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// For all other errors return here.
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return err
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}
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// ListVols - list volumes.
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func (s fsStorage) ListVols() (volsInfo []VolInfo, err error) {
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// Get disk info to be populated for VolInfo.
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var diskInfo disk.Info
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diskInfo, err = disk.GetInfo(s.diskPath)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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}).Debugf("Failed to get disk info, %s", err)
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return nil, err
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}
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volsInfo, err = getAllUniqueVols(s.diskPath)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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}).Debugf("getAllUniqueVols failed with %s", err)
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return nil, err
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}
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for i, vol := range volsInfo {
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// Volname on case sensitive fs backends can come in as
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// capitalized, but object layer cannot consume it
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// directly. Convert it as we see fit.
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volName := strings.ToLower(vol.Name)
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volInfo := VolInfo{
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Name: volName,
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Created: vol.Created,
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Total: diskInfo.Total,
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Free: diskInfo.Free,
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FSType: diskInfo.FSType,
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}
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volsInfo[i] = volInfo
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}
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return volsInfo, nil
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}
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// StatVol - get volume info.
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func (s fsStorage) StatVol(volume string) (volInfo VolInfo, err error) {
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// Verify if volume is valid and it exists.
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volumeDir, err := s.getVolumeDir(volume)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("getVolumeDir failed with %s", err)
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return VolInfo{}, err
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}
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// Stat a volume entry.
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var st os.FileInfo
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st, err = os.Stat(volumeDir)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("Stat on the volume failed with %s", err)
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if os.IsNotExist(err) {
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return VolInfo{}, errVolumeNotFound
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}
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return VolInfo{}, err
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}
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// Get disk info, to be returned back along with volume info.
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var diskInfo disk.Info
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diskInfo, err = disk.GetInfo(s.diskPath)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("Failed to get disk info, %s", err)
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return VolInfo{}, err
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}
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// As os.Stat() doesn't carry other than ModTime(), use ModTime()
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// as CreatedTime.
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createdTime := st.ModTime()
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return VolInfo{
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Name: volume,
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Created: createdTime,
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Free: diskInfo.Free,
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Total: diskInfo.Total,
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FSType: diskInfo.FSType,
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}, nil
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}
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// DeleteVol - delete a volume.
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func (s fsStorage) DeleteVol(volume string) error {
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// Verify if volume is valid and it exists.
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volumeDir, err := s.getVolumeDir(volume)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("getVolumeDir failed with %s", err)
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return err
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}
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err = os.Remove(volumeDir)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("Volume remove failed with %s", err)
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if os.IsNotExist(err) {
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return errVolumeNotFound
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} else if strings.Contains(err.Error(), "directory is not empty") {
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// On windows the string is slightly different, handle it here.
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return errVolumeNotEmpty
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} else if strings.Contains(err.Error(), "directory not empty") {
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// Hopefully for all other
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// operating systems, this is
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// assumed to be consistent.
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return errVolumeNotEmpty
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}
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return err
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}
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return nil
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}
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// ListDir - return all the entries at the given directory path.
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// If an entry is a directory it will be returned with a trailing "/".
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func (s fsStorage) ListDir(volume, dirPath string) ([]string, error) {
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// Verify if volume is valid and it exists.
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volumeDir, err := s.getVolumeDir(volume)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("getVolumeDir failed with %s", err)
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return nil, err
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}
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// Stat a volume entry.
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_, err = os.Stat(volumeDir)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("Stat on the volume failed with %s", err)
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if os.IsNotExist(err) {
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return nil, errVolumeNotFound
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}
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return nil, err
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}
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return readDir(pathJoin(volumeDir, dirPath))
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}
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// ReadFile - read a file at a given offset.
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func (s fsStorage) ReadFile(volume string, path string, offset int64) (readCloser io.ReadCloser, err error) {
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volumeDir, err := s.getVolumeDir(volume)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("getVolumeDir failed with %s", err)
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return nil, err
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}
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filePath := pathJoin(volumeDir, path)
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file, err := os.Open(filePath)
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if err != nil {
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if os.IsNotExist(err) {
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return nil, errFileNotFound
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} else if os.IsPermission(err) {
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return nil, errFileAccessDenied
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}
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"filePath": filePath,
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}).Debugf("Opening a file failed with %s", err)
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return nil, err
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}
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st, err := file.Stat()
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"filePath": filePath,
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}).Debugf("Stat failed with %s", err)
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return nil, err
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}
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// Verify if its not a regular file, since subsequent Seek is undefined.
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if !st.Mode().IsRegular() {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"filePath": filePath,
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}).Debugf("Unexpected type %s", errIsNotRegular)
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return nil, errFileNotFound
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}
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// Seek to requested offset.
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_, err = file.Seek(offset, os.SEEK_SET)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"filePath": filePath,
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"offset": offset,
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}).Debugf("Seek failed with %s", err)
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return nil, err
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}
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return file, nil
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}
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// CreateFile - create a file at path.
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func (s fsStorage) CreateFile(volume, path string) (writeCloser io.WriteCloser, err error) {
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volumeDir, err := s.getVolumeDir(volume)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("getVolumeDir failed with %s", err)
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return nil, err
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}
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if err = checkDiskFree(s.diskPath, s.minFreeDisk); err != nil {
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return nil, err
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}
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filePath := pathJoin(volumeDir, path)
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// Verify if the file already exists and is not of regular type.
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var st os.FileInfo
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if st, err = os.Stat(filePath); err == nil {
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if st.IsDir() {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"filePath": filePath,
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}).Debugf("Unexpected type %s", errIsNotRegular)
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return nil, errIsNotRegular
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}
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}
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w, err := safe.CreateFileWithPrefix(filePath, "$tmpfile")
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if err != nil {
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// File path cannot be verified since one of the parents is a file.
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if strings.Contains(err.Error(), "not a directory") {
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return nil, errFileAccessDenied
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}
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return nil, err
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}
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return w, nil
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}
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// StatFile - get file info.
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func (s fsStorage) StatFile(volume, path string) (file FileInfo, err error) {
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volumeDir, err := s.getVolumeDir(volume)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"volume": volume,
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}).Debugf("getVolumeDir failed with %s", err)
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return FileInfo{}, err
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}
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filePath := pathJoin(volumeDir, path)
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st, err := os.Stat(filePath)
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if err != nil {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"filePath": filePath,
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}).Debugf("Stat failed with %s", err)
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// File is really not found.
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if os.IsNotExist(err) {
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return FileInfo{}, errFileNotFound
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}
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// File path cannot be verified since one of the parents is a file.
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if strings.Contains(err.Error(), "not a directory") {
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return FileInfo{}, errFileNotFound
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}
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// Return all errors here.
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return FileInfo{}, err
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}
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// If its a directory its not a regular file.
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if st.Mode().IsDir() {
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log.WithFields(logrus.Fields{
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"diskPath": s.diskPath,
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"filePath": filePath,
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}).Debugf("File is %s.", errIsNotRegular)
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return FileInfo{}, errFileNotFound
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}
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return FileInfo{
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Volume: volume,
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Name: path,
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ModTime: st.ModTime(),
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Size: st.Size(),
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Mode: st.Mode(),
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}, nil
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}
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// deleteFile - delete file path if its empty.
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func deleteFile(basePath, deletePath string) error {
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if basePath == deletePath {
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return nil
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}
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// Verify if the path exists.
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pathSt, err := os.Stat(deletePath)
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if err != nil {
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log.WithFields(logrus.Fields{
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"deletePath": deletePath,
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}).Debugf("Stat failed with %s", err)
|
|
if os.IsNotExist(err) {
|
|
return errFileNotFound
|
|
} else if os.IsPermission(err) {
|
|
return errFileAccessDenied
|
|
}
|
|
return err
|
|
}
|
|
if pathSt.IsDir() {
|
|
// Verify if directory is empty.
|
|
empty, err := isDirEmpty(deletePath)
|
|
if err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"deletePath": deletePath,
|
|
}).Debugf("isDirEmpty failed with %s", err)
|
|
return err
|
|
}
|
|
if !empty {
|
|
return nil
|
|
}
|
|
}
|
|
// Attempt to remove path.
|
|
if err := os.Remove(deletePath); err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"deletePath": deletePath,
|
|
}).Debugf("Remove failed with %s", err)
|
|
return err
|
|
}
|
|
// Recursively go down the next path and delete again.
|
|
if err := deleteFile(basePath, path.Dir(deletePath)); err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"basePath": basePath,
|
|
"deleteDir": path.Dir(deletePath),
|
|
}).Debugf("deleteFile failed with %s", err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// DeleteFile - delete a file at path.
|
|
func (s fsStorage) DeleteFile(volume, path string) error {
|
|
volumeDir, err := s.getVolumeDir(volume)
|
|
if err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"volume": volume,
|
|
}).Debugf("getVolumeDir failed with %s", err)
|
|
return err
|
|
}
|
|
|
|
// Following code is needed so that we retain "/" suffix if any in
|
|
// path argument.
|
|
filePath := pathJoin(volumeDir, path)
|
|
|
|
// Delete file and delete parent directory as well if its empty.
|
|
return deleteFile(volumeDir, filePath)
|
|
}
|
|
|
|
// RenameFile - rename file.
|
|
func (s fsStorage) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) error {
|
|
srcVolumeDir, err := s.getVolumeDir(srcVolume)
|
|
if err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"volume": srcVolume,
|
|
}).Errorf("getVolumeDir failed with %s", err)
|
|
return err
|
|
}
|
|
dstVolumeDir, err := s.getVolumeDir(dstVolume)
|
|
if err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"volume": dstVolume,
|
|
}).Errorf("getVolumeDir failed with %s", err)
|
|
return err
|
|
}
|
|
if err = os.MkdirAll(path.Join(dstVolumeDir, path.Dir(dstPath)), 0755); err != nil {
|
|
// File path cannot be verified since one of the parents is a file.
|
|
if strings.Contains(err.Error(), "not a directory") {
|
|
return errFileAccessDenied
|
|
}
|
|
log.Errorf("os.MkdirAll failed with %s", err)
|
|
return err
|
|
}
|
|
err = os.Rename(path.Join(srcVolumeDir, srcPath), path.Join(dstVolumeDir, dstPath))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return errFileNotFound
|
|
}
|
|
log.Errorf("os.Rename failed with %s", err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|