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564 lines
14 KiB
564 lines
14 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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"bytes"
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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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"runtime"
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"strings"
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"syscall"
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"github.com/minio/minio/pkg/disk"
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)
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const (
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fsMinSpacePercent = 5
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)
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// posix - implements StorageAPI interface.
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type posix struct {
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diskPath string
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minFreeDisk int64
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}
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// checkPathLength - returns error if given path name length more than 255
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func checkPathLength(pathName string) error {
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// For MS Windows, the maximum path length is 255
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if runtime.GOOS == "windows" {
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if len(pathName) > 255 {
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return errFileNameTooLong
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}
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return nil
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}
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// For non-windows system, check each path segment length is > 255
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for len(pathName) > 0 && pathName != "." && pathName != "/" {
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dir, file := slashpath.Dir(pathName), slashpath.Base(pathName)
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if len(file) > 255 {
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return errFileNameTooLong
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}
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pathName = dir
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}
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return nil
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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) bool {
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f, err := os.Open(dirname)
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if err != nil {
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errorIf(err, "Unable to access directory.")
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return false
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}
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defer f.Close()
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// List one entry.
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_, err = f.Readdirnames(1)
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if err != nil {
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if err == io.EOF {
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// Returns true if we have reached EOF, directory is indeed empty.
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return true
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}
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errorIf(err, "Unable to list directory.")
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return false
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}
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// Directory is not empty.
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return false
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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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return nil, errInvalidArgument
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}
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fs := posix{
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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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st, err := os.Stat(diskPath)
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if err != nil {
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if os.IsNotExist(err) {
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return fs, errDiskNotFound
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}
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return fs, err
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}
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if !st.IsDir() {
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return fs, syscall.ENOTDIR
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}
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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 space.
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func checkDiskFree(diskPath string, minFreeDisk int64) (err error) {
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if err = checkPathLength(diskPath); err != nil {
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return err
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}
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di, err := disk.GetInfo(diskPath)
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if err != nil {
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if os.IsNotExist(err) {
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return errDiskNotFound
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}
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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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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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// List all the volumes from diskPath.
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func listVols(dirPath string) ([]VolInfo, error) {
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if err := checkPathLength(dirPath); err != nil {
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return nil, err
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}
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entries, err := readDir(dirPath)
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if err != nil {
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return nil, errDiskNotFound
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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(slashpath.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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var fi os.FileInfo
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fi, err = os.Stat(pathJoin(dirPath, entry))
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if err != nil {
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// If the file does not exist, skip the entry.
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if os.IsNotExist(err) {
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continue
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}
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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 volsInfo, nil
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}
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// getVolDir - 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 posix) getVolDir(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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if err := checkPathLength(volume); err != nil {
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return "", err
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}
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volumeDir := pathJoin(s.diskPath, volume)
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return volumeDir, nil
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}
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// Make a volume entry.
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func (s posix) 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.getVolDir(volume)
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if err != nil {
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return err
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}
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// Make a volume entry.
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err = os.Mkdir(volumeDir, 0700)
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if err != nil && os.IsExist(err) {
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return errVolumeExists
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}
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// Success
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return nil
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}
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// ListVols - list volumes.
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func (s posix) ListVols() (volsInfo []VolInfo, err error) {
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volsInfo, err = listVols(s.diskPath)
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if err != nil {
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return nil, err
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}
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for i, vol := range volsInfo {
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volInfo := VolInfo{
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Name: vol.Name,
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Created: vol.Created,
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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 posix) StatVol(volume string) (volInfo VolInfo, 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 VolInfo{}, err
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}
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// Verify if volume is valid and it exists.
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volumeDir, err := s.getVolDir(volume)
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if err != nil {
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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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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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// 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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}, nil
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}
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// DeleteVol - delete a volume.
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func (s posix) DeleteVol(volume string) error {
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// Verify if volume is valid and it exists.
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volumeDir, err := s.getVolDir(volume)
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if err != nil {
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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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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 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 posix) 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.getVolDir(volume)
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if err != nil {
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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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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 reads exactly len(buf) bytes into buf. It returns the
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// number of bytes copied. The error is EOF only if no bytes were
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// read. On return, n == len(buf) if and only if err == nil. n == 0
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// for io.EOF. Additionally ReadFile also starts reading from an
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// offset.
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func (s posix) ReadFile(volume string, path string, offset int64, buf []byte) (n int64, err error) {
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volumeDir, err := s.getVolDir(volume)
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if err != nil {
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return 0, 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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if os.IsNotExist(err) {
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return 0, errVolumeNotFound
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}
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return 0, err
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}
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filePath := pathJoin(volumeDir, path)
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if err = checkPathLength(filePath); err != nil {
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return 0, err
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}
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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 0, errFileNotFound
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} else if os.IsPermission(err) {
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return 0, errFileAccessDenied
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} else if strings.Contains(err.Error(), "not a directory") {
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return 0, errFileNotFound
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}
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return 0, err
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}
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st, err := file.Stat()
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if err != nil {
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return 0, 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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return 0, 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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return 0, err
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}
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// Close the reader.
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defer file.Close()
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// Read file.
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m, err := io.ReadFull(file, buf)
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// Error unexpected is valid, set this back to nil.
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if err == io.ErrUnexpectedEOF {
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err = nil
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}
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// Success.
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return int64(m), err
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}
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// AppendFile - append a byte array at path, if file doesn't exist at
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// path this call explicitly creates it.
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func (s posix) AppendFile(volume, path string, buf []byte) (n int64, err error) {
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volumeDir, err := s.getVolDir(volume)
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if err != nil {
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return 0, 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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if os.IsNotExist(err) {
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return 0, errVolumeNotFound
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}
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return 0, err
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}
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if err = checkDiskFree(s.diskPath, s.minFreeDisk); err != nil {
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return 0, err
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}
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filePath := pathJoin(volumeDir, path)
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if err = checkPathLength(filePath); err != nil {
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return 0, err
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}
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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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return 0, errIsNotRegular
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}
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}
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// Create top level directories if they don't exist.
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if err = os.MkdirAll(filepath.Dir(filePath), 0700); err != nil {
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return 0, err
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}
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w, err := os.OpenFile(filePath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
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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 0, errFileAccessDenied
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}
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return 0, err
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}
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// Close upon return.
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defer w.Close()
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// Return io.Copy
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return io.Copy(w, bytes.NewReader(buf))
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}
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// StatFile - get file info.
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func (s posix) StatFile(volume, path string) (file FileInfo, err error) {
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volumeDir, err := s.getVolDir(volume)
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if err != nil {
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return FileInfo{}, 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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if os.IsNotExist(err) {
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return FileInfo{}, errVolumeNotFound
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}
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return FileInfo{}, err
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}
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filePath := slashpath.Join(volumeDir, path)
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if err = checkPathLength(filePath); err != nil {
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return FileInfo{}, err
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}
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st, err := os.Stat(filePath)
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if err != nil {
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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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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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if os.IsNotExist(err) {
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return errFileNotFound
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} else if os.IsPermission(err) {
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return errFileAccessDenied
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}
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return err
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}
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if pathSt.IsDir() && !isDirEmpty(deletePath) {
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// Verify if directory is empty.
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return nil
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}
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// Attempt to remove path.
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if err := os.Remove(deletePath); err != nil {
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return err
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}
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// Recursively go down the next path and delete again.
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if err := deleteFile(basePath, slashpath.Dir(deletePath)); err != nil {
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return err
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}
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return nil
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}
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// DeleteFile - delete a file at path.
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func (s posix) DeleteFile(volume, path string) error {
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volumeDir, err := s.getVolDir(volume)
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if err != nil {
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return 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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if os.IsNotExist(err) {
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return errVolumeNotFound
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}
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return err
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}
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// Following code is needed so that we retain "/" suffix if any in
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// path argument.
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filePath := pathJoin(volumeDir, path)
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if err = checkPathLength(filePath); err != nil {
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return err
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}
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// Delete file and delete parent directory as well if its empty.
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return deleteFile(volumeDir, filePath)
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}
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// RenameFile - rename source path to destination path atomically.
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func (s posix) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) error {
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srcVolumeDir, err := s.getVolDir(srcVolume)
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if err != nil {
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return err
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}
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dstVolumeDir, err := s.getVolDir(dstVolume)
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if err != nil {
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return err
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}
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// Stat a volume entry.
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_, err = os.Stat(srcVolumeDir)
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if err != nil {
|
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if os.IsNotExist(err) {
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return errVolumeNotFound
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}
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return err
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}
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_, err = os.Stat(dstVolumeDir)
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if err != nil {
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if os.IsNotExist(err) {
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return errVolumeNotFound
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}
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}
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srcIsDir := strings.HasSuffix(srcPath, slashSeparator)
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dstIsDir := strings.HasSuffix(dstPath, slashSeparator)
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// Either src and dst have to be directories or files, else return error.
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if !(srcIsDir && dstIsDir || !srcIsDir && !dstIsDir) {
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return errFileAccessDenied
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}
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if srcIsDir {
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// If source is a directory we expect the destination to be non-existent always.
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_, err = os.Stat(slashpath.Join(dstVolumeDir, dstPath))
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if err == nil {
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return errFileAccessDenied
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}
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if !os.IsNotExist(err) {
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return err
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}
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// Destination does not exist, hence proceed with the rename.
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}
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if err = os.MkdirAll(slashpath.Dir(slashpath.Join(dstVolumeDir, dstPath)), 0755); 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 errFileAccessDenied
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}
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return err
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}
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err = os.Rename(slashpath.Join(srcVolumeDir, srcPath), slashpath.Join(dstVolumeDir, dstPath))
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if err != nil {
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if os.IsNotExist(err) {
|
|
return errFileNotFound
|
|
}
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|