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733 lines
20 KiB
733 lines
20 KiB
/*
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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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slashpath "path"
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"path/filepath"
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"strings"
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"sync"
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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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fsListLimit = 1000
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)
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// listParams - list object params used for list object map
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type listParams struct {
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bucket string
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recursive bool
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marker string
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prefix string
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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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listObjectMap map[listParams][]*treeWalker
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listObjectMapMutex *sync.Mutex
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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 newFS(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: 5, // Minimum 5% disk should be free.
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listObjectMap: make(map[listParams][]*treeWalker),
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listObjectMapMutex: &sync.Mutex{},
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}
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log.WithFields(logrus.Fields{
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"diskPath": diskPath,
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"minFreeDisk": 5,
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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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volumeFn := func(dirent fsDirent) bool {
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// Return all directories.
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return dirent.IsDir() && isValidVolname(filepath.Clean(dirent.name))
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}
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namesOnly := true // Returned are only names.
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dirents, err := scandir(dirPath, volumeFn, namesOnly)
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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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"namesOnly": true,
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}).Debugf("Scandir 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 _, dirent := range dirents {
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fi, err := os.Stat(filepath.Join(dirPath, dirent.name))
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if err != nil {
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log.WithFields(logrus.Fields{
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"path": filepath.Join(dirPath, dirent.name),
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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 := filepath.Join(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
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// the volume
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// is equal to the incoming volume, then use the proper
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// name.
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if strings.ToLower(vol.Name) == volume {
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volumeDir = filepath.Join(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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// Save the goroutine reference in the map
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func (s *fsStorage) saveTreeWalk(params listParams, walker *treeWalker) {
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s.listObjectMapMutex.Lock()
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defer s.listObjectMapMutex.Unlock()
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log.WithFields(logrus.Fields{
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"bucket": params.bucket,
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"recursive": params.recursive,
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"marker": params.marker,
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"prefix": params.prefix,
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}).Debugf("saveTreeWalk has been invoked.")
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walkers, _ := s.listObjectMap[params]
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walkers = append(walkers, walker)
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s.listObjectMap[params] = walkers
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log.Debugf("Successfully saved in listObjectMap.")
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}
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// Lookup the goroutine reference from map
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func (s *fsStorage) lookupTreeWalk(params listParams) *treeWalker {
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s.listObjectMapMutex.Lock()
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defer s.listObjectMapMutex.Unlock()
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log.WithFields(logrus.Fields{
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"bucket": params.bucket,
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"recursive": params.recursive,
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"marker": params.marker,
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"prefix": params.prefix,
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}).Debugf("lookupTreeWalk has been invoked.")
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if walkChs, ok := s.listObjectMap[params]; ok {
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for i, walkCh := range walkChs {
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if !walkCh.timedOut {
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newWalkChs := walkChs[i+1:]
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if len(newWalkChs) > 0 {
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s.listObjectMap[params] = newWalkChs
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} else {
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delete(s.listObjectMap, params)
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}
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log.WithFields(logrus.Fields{
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"bucket": params.bucket,
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"recursive": params.recursive,
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"marker": params.marker,
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"prefix": params.prefix,
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}).Debugf("Found the previous saved listsObjects params.")
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return walkCh
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}
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}
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// As all channels are timed out, delete the map entry
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delete(s.listObjectMap, params)
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}
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return nil
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}
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|
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// List operation.
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func (s fsStorage) ListFiles(volume, prefix, marker string, recursive bool, count int) ([]FileInfo, bool, 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,
|
|
"volume": volume,
|
|
}).Debugf("getVolumeDir failed with %s", err)
|
|
return nil, true, err
|
|
}
|
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var fileInfos []FileInfo
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|
|
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if marker != "" {
|
|
// Verify if marker has prefix.
|
|
if marker != "" && !strings.HasPrefix(marker, prefix) {
|
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log.WithFields(logrus.Fields{
|
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"diskPath": s.diskPath,
|
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"marker": marker,
|
|
"prefix": prefix,
|
|
}).Debugf("Marker doesn't have prefix in common.")
|
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return nil, true, errInvalidArgument
|
|
}
|
|
}
|
|
|
|
// Return empty response for a valid request when count is 0.
|
|
if count == 0 {
|
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return nil, true, nil
|
|
}
|
|
|
|
// Over flowing count - reset to fsListLimit.
|
|
if count < 0 || count > fsListLimit {
|
|
count = fsListLimit
|
|
}
|
|
|
|
// Verify if prefix exists.
|
|
prefixDir := slashpath.Dir(prefix)
|
|
prefixRootDir := slashpath.Join(volumeDir, prefixDir)
|
|
if status, err := isDirExist(prefixRootDir); !status {
|
|
if err == nil {
|
|
// Prefix does not exist, not an error just respond empty list response.
|
|
return nil, true, nil
|
|
} else if err.Error() == syscall.ENOTDIR.Error() {
|
|
// Prefix exists as a file.
|
|
return nil, true, nil
|
|
}
|
|
|
|
log.WithFields(logrus.Fields{
|
|
"volumeDir": volumeDir,
|
|
"prefixRootDir": prefixRootDir,
|
|
}).Debugf("isDirExist returned an unhandled error %s", err)
|
|
|
|
// Rest errors should be treated as failure.
|
|
return nil, true, err
|
|
}
|
|
|
|
// Maximum 1000 files returned in a single call.
|
|
// Further calls will set right marker value to continue reading the rest of the files.
|
|
// popTreeWalker returns nil if the call to ListFiles is done for the first time.
|
|
// On further calls to ListFiles to retrive more files within the timeout period,
|
|
// popTreeWalker returns the channel from which rest of the objects can be retrieved.
|
|
walker := s.lookupTreeWalk(listParams{volume, recursive, marker, prefix})
|
|
if walker == nil {
|
|
walker = startTreeWalk(filepath.ToSlash(s.diskPath), volume, prefix, marker, recursive)
|
|
}
|
|
nextMarker := ""
|
|
log.Debugf("Reading from the tree walk channel has begun.")
|
|
for i := 0; i < count; {
|
|
walkResult, ok := <-walker.ch
|
|
if !ok {
|
|
// Closed channel.
|
|
return fileInfos, true, nil
|
|
}
|
|
// For any walk error return right away.
|
|
if walkResult.err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"volume": volume,
|
|
"prefix": prefix,
|
|
"marker": marker,
|
|
"recursive": recursive,
|
|
}).Debugf("Walk resulted in an error %s", walkResult.err)
|
|
return nil, true, walkResult.err
|
|
}
|
|
fileInfo := walkResult.fileInfo
|
|
fileInfo.Name = filepath.ToSlash(fileInfo.Name)
|
|
fileInfos = append(fileInfos, fileInfo)
|
|
// We have listed everything return.
|
|
if walkResult.end {
|
|
return fileInfos, true, nil
|
|
}
|
|
nextMarker = fileInfo.Name
|
|
i++
|
|
}
|
|
params := listParams{volume, recursive, nextMarker, prefix}
|
|
log.WithFields(logrus.Fields{
|
|
"bucket": params.bucket,
|
|
"recursive": params.recursive,
|
|
"marker": params.marker,
|
|
"prefix": params.prefix,
|
|
}).Debugf("Save the tree walk into map for subsequent requests.")
|
|
s.saveTreeWalk(params, walker)
|
|
return fileInfos, false, nil
|
|
}
|
|
|
|
// ReadFile - read a file at a given offset.
|
|
func (s fsStorage) ReadFile(volume string, path string, offset int64) (readCloser io.ReadCloser, err 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 nil, err
|
|
}
|
|
|
|
filePath := filepath.Join(volumeDir, filepath.FromSlash(path))
|
|
file, err := os.Open(filePath)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return nil, errFileNotFound
|
|
} else if os.IsPermission(err) {
|
|
return nil, errFileAccessDenied
|
|
}
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"filePath": filePath,
|
|
}).Debugf("Opening a file failed with %s", err)
|
|
return nil, err
|
|
}
|
|
st, err := file.Stat()
|
|
if err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"filePath": filePath,
|
|
}).Debugf("Stat failed with %s", err)
|
|
return nil, err
|
|
}
|
|
// Verify if its not a regular file, since subsequent Seek is undefined.
|
|
if !st.Mode().IsRegular() {
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"filePath": filePath,
|
|
}).Debugf("Unexpected type %s", errIsNotRegular)
|
|
return nil, errFileNotFound
|
|
}
|
|
// Seek to requested offset.
|
|
_, err = file.Seek(offset, os.SEEK_SET)
|
|
if err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"filePath": filePath,
|
|
"offset": offset,
|
|
}).Debugf("Seek failed with %s", err)
|
|
return nil, err
|
|
}
|
|
return file, nil
|
|
}
|
|
|
|
// CreateFile - create a file at path.
|
|
func (s fsStorage) CreateFile(volume, path string) (writeCloser io.WriteCloser, err 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 nil, err
|
|
}
|
|
if err := checkDiskFree(s.diskPath, s.minFreeDisk); err != nil {
|
|
return nil, err
|
|
}
|
|
filePath := filepath.Join(volumeDir, path)
|
|
// Verify if the file already exists and is not of regular type.
|
|
if st, err := os.Stat(filePath); err == nil {
|
|
if st.IsDir() {
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"filePath": filePath,
|
|
}).Debugf("Unexpected type %s", errIsNotRegular)
|
|
return nil, errIsNotRegular
|
|
}
|
|
}
|
|
return safe.CreateFileWithPrefix(filePath, "$tmpfile")
|
|
}
|
|
|
|
// StatFile - get file info.
|
|
func (s fsStorage) StatFile(volume, path string) (file FileInfo, err 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 FileInfo{}, err
|
|
}
|
|
|
|
filePath := filepath.Join(volumeDir, filepath.FromSlash(path))
|
|
st, err := os.Stat(filePath)
|
|
if err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"filePath": filePath,
|
|
}).Debugf("Stat failed with %s", err)
|
|
|
|
// File is really not found.
|
|
if os.IsNotExist(err) {
|
|
return FileInfo{}, errFileNotFound
|
|
}
|
|
|
|
// File path cannot be verified since one of the parents is a file.
|
|
if strings.Contains(err.Error(), "not a directory") {
|
|
return FileInfo{}, errFileNotFound
|
|
}
|
|
|
|
// Return all errors here.
|
|
return FileInfo{}, err
|
|
}
|
|
|
|
// If its a directory its not a regular file.
|
|
if st.Mode().IsDir() {
|
|
log.WithFields(logrus.Fields{
|
|
"diskPath": s.diskPath,
|
|
"filePath": filePath,
|
|
}).Debugf("File is %s.", errIsNotRegular)
|
|
return FileInfo{}, errFileNotFound
|
|
}
|
|
return FileInfo{
|
|
Volume: volume,
|
|
Name: path,
|
|
ModTime: st.ModTime(),
|
|
Size: st.Size(),
|
|
Mode: st.Mode(),
|
|
}, nil
|
|
}
|
|
|
|
// deleteFile - delete file path if its empty.
|
|
func deleteFile(basePath, deletePath string) error {
|
|
if basePath == deletePath {
|
|
return nil
|
|
}
|
|
// Verify if the path exists.
|
|
pathSt, err := os.Stat(deletePath)
|
|
if err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"deletePath": deletePath,
|
|
}).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, filepath.Dir(deletePath)); err != nil {
|
|
log.WithFields(logrus.Fields{
|
|
"basePath": basePath,
|
|
"deleteDir": filepath.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 := filepath.Join(volumeDir, filepath.FromSlash(path))
|
|
if strings.HasSuffix(filepath.FromSlash(path), string(os.PathSeparator)) {
|
|
filePath = filePath + string(os.PathSeparator)
|
|
}
|
|
|
|
// Delete file and delete parent directory as well if its empty.
|
|
return deleteFile(volumeDir, filePath)
|
|
}
|
|
|