mirror of
https://github.com/minio/minio.git
synced 2024-12-25 06:35:56 -05:00
bccf549463
This change brings a change which was done for the 'mc' package to allow for clean repo and have a cleaner github drop in experience.
823 lines
20 KiB
Go
823 lines
20 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"bytes"
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"errors"
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"io"
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"io/ioutil"
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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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"sync/atomic"
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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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maxAllowedIOError = 5
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)
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// posix - implements StorageAPI interface.
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type posix struct {
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ioErrCount int32 // ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG
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diskPath string
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minFreeDisk int64
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}
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var errFaultyDisk = errors.New("Faulty disk")
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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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// Apple OS X path length is limited to 1016
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if runtime.GOOS == "darwin" && len(pathName) > 1016 {
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return errFileNameTooLong
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}
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// 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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} // Success.
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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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var err error
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// Disallow relative paths, figure out absolute paths.
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diskPath, err = filepath.Abs(diskPath)
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if err != nil {
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return nil, err
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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(preparePath(diskPath))
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if err != nil {
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if os.IsNotExist(err) {
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// Disk not found create it.
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if err = os.MkdirAll(diskPath, 0777); err != nil {
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return fs, err
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}
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return fs, nil
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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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// getDiskInfo returns given disk information.
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func getDiskInfo(diskPath string) (di disk.Info, err error) {
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if err = checkPathLength(diskPath); err == nil {
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di, err = disk.GetInfo(diskPath)
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}
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if os.IsNotExist(err) {
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err = errDiskNotFound
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}
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return di, err
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}
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// checkDiskFree verifies if disk path has sufficient minimum free disk space and files.
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func checkDiskFree(diskPath string, minFreeDisk int64) (err error) {
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di, err := getDiskInfo(diskPath)
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if err != nil {
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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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// Some filesystems do not implement a way to provide total inodes available, instead inodes
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// are allocated based on available disk space. For example CephFS, StoreNext CVFS, AzureFile driver.
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// Allow for the available disk to be separately validate and we will validate inodes only if
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// total inodes are provided by the underlying filesystem.
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if di.Files != 0 {
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availableFiles := (float64(di.Ffree) / (float64(di.Files) - (0.05 * float64(di.Files)))) * 100
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if int64(availableFiles) <= minFreeDisk {
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return errDiskFull
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}
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}
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// Success.
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return 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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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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defer func() {
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if err == syscall.EIO {
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atomic.AddInt32(&s.ioErrCount, 1)
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}
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}()
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if s.ioErrCount > maxAllowedIOError {
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return errFaultyDisk
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}
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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, with mode 0777 mkdir honors system umask.
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err = os.Mkdir(preparePath(volumeDir), 0777)
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if err != nil {
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if os.IsExist(err) {
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return errVolumeExists
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} else if os.IsPermission(err) {
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return errDiskAccessDenied
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}
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return err
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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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defer func() {
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if err == syscall.EIO {
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atomic.AddInt32(&s.ioErrCount, 1)
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}
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}()
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if s.ioErrCount > maxAllowedIOError {
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return nil, errFaultyDisk
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}
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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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// 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(preparePath(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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// StatVol - get volume info.
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func (s *posix) StatVol(volume string) (volInfo VolInfo, err error) {
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defer func() {
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if err == syscall.EIO {
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atomic.AddInt32(&s.ioErrCount, 1)
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}
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}()
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if s.ioErrCount > maxAllowedIOError {
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return VolInfo{}, errFaultyDisk
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}
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// Check disk availability.
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if _, err = getDiskInfo(s.diskPath); 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(preparePath(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) (err error) {
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defer func() {
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if err == syscall.EIO {
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atomic.AddInt32(&s.ioErrCount, 1)
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}
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}()
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if s.ioErrCount > maxAllowedIOError {
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return errFaultyDisk
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}
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// Check disk availability.
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if _, err = getDiskInfo(s.diskPath); err != nil {
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return 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 err
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}
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err = os.Remove(preparePath(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) (entries []string, err error) {
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defer func() {
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if err == syscall.EIO {
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atomic.AddInt32(&s.ioErrCount, 1)
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}
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}()
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if s.ioErrCount > maxAllowedIOError {
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return nil, errFaultyDisk
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}
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// Check disk availability.
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if _, err = getDiskInfo(s.diskPath); err != nil {
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return nil, 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 nil, err
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}
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// Stat a volume entry.
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_, err = os.Stat(preparePath(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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// ReadAll reads from r until an error or EOF and returns the data it read.
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// A successful call returns err == nil, not err == EOF. Because ReadAll is
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// defined to read from src until EOF, it does not treat an EOF from Read
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// as an error to be reported.
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// This API is meant to be used on files which have small memory footprint, do
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// not use this on large files as it would cause server to crash.
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func (s *posix) ReadAll(volume, path string) (buf []byte, err error) {
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defer func() {
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if err == syscall.EIO {
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atomic.AddInt32(&s.ioErrCount, 1)
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}
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}()
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if s.ioErrCount > maxAllowedIOError {
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return nil, errFaultyDisk
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}
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// Check disk availability.
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if _, err = getDiskInfo(s.diskPath); err != nil {
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return nil, 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 nil, err
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}
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// Stat a volume entry.
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_, err = os.Stat(preparePath(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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// Validate file path length, before reading.
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filePath := pathJoin(volumeDir, path)
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if err = checkPathLength(filePath); err != nil {
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return nil, err
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}
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// Open the file for reading.
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buf, err = ioutil.ReadFile(preparePath(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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} else if pathErr, ok := err.(*os.PathError); ok {
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switch pathErr.Err {
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case syscall.ENOTDIR, syscall.EISDIR:
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return nil, errFileNotFound
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default:
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if strings.Contains(pathErr.Err.Error(), "The handle is invalid") {
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// This case is special and needs to be handled for windows.
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return nil, errFileNotFound
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}
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}
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return nil, pathErr
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}
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return nil, err
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}
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return buf, nil
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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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defer func() {
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if err == syscall.EIO {
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atomic.AddInt32(&s.ioErrCount, 1)
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}
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}()
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if s.ioErrCount > maxAllowedIOError {
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return 0, errFaultyDisk
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}
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// Check disk availability.
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if _, err = getDiskInfo(s.diskPath); err != nil {
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return 0, 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 0, err
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}
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// Stat a volume entry.
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_, err = os.Stat(preparePath(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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// Validate effective path length before reading.
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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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// Open the file for reading.
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file, err := os.Open(preparePath(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, errFileAccessDenied
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}
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return 0, err
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}
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// Close the file descriptor.
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defer file.Close()
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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, errIsNotRegular
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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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// Read full until buffer.
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m, err := io.ReadFull(file, buf)
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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) (err error) {
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defer func() {
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if err == syscall.EIO {
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atomic.AddInt32(&s.ioErrCount, 1)
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}
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}()
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if s.ioErrCount > maxAllowedIOError {
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return errFaultyDisk
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}
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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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// Stat a volume entry.
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_, err = os.Stat(preparePath(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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filePath := pathJoin(volumeDir, path)
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if err = checkPathLength(filePath); err != nil {
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return err
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|
}
|
|
// Verify if the file already exists and is not of regular type.
|
|
var st os.FileInfo
|
|
if st, err = os.Stat(preparePath(filePath)); err == nil {
|
|
if !st.Mode().IsRegular() {
|
|
return errIsNotRegular
|
|
}
|
|
}
|
|
// Create top level directories if they don't exist.
|
|
// with mode 0777 mkdir honors system umask.
|
|
if err = mkdirAll(filepath.Dir(filePath), 0777); 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
|
|
} else if runtime.GOOS == "windows" && strings.Contains(err.Error(), "system cannot find the path specified") {
|
|
// Add specific case for windows.
|
|
return errFileAccessDenied
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Creates the named file with mode 0666 (before umask), or starts appending
|
|
// to an existig file.
|
|
w, err := os.OpenFile(preparePath(filePath), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0666)
|
|
if 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
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Close upon return.
|
|
defer w.Close()
|
|
|
|
// Return io.Copy
|
|
_, err = io.Copy(w, bytes.NewReader(buf))
|
|
return err
|
|
}
|
|
|
|
// StatFile - get file info.
|
|
func (s *posix) StatFile(volume, path string) (file FileInfo, err error) {
|
|
defer func() {
|
|
if err == syscall.EIO {
|
|
atomic.AddInt32(&s.ioErrCount, 1)
|
|
}
|
|
}()
|
|
|
|
if s.ioErrCount > maxAllowedIOError {
|
|
return FileInfo{}, errFaultyDisk
|
|
}
|
|
|
|
// Check disk availability.
|
|
if _, err = getDiskInfo(s.diskPath); err != nil {
|
|
return FileInfo{}, err
|
|
}
|
|
|
|
volumeDir, err := s.getVolDir(volume)
|
|
if err != nil {
|
|
return FileInfo{}, err
|
|
}
|
|
// Stat a volume entry.
|
|
_, err = os.Stat(preparePath(volumeDir))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return FileInfo{}, errVolumeNotFound
|
|
}
|
|
return FileInfo{}, err
|
|
}
|
|
|
|
filePath := slashpath.Join(volumeDir, path)
|
|
if err = checkPathLength(filePath); err != nil {
|
|
return FileInfo{}, err
|
|
}
|
|
st, err := os.Stat(preparePath(filePath))
|
|
if err != nil {
|
|
// 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() {
|
|
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(preparePath(deletePath))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return errFileNotFound
|
|
} else if os.IsPermission(err) {
|
|
return errFileAccessDenied
|
|
}
|
|
return err
|
|
}
|
|
if pathSt.IsDir() && !isDirEmpty(deletePath) {
|
|
// Verify if directory is empty.
|
|
return nil
|
|
}
|
|
// Attempt to remove path.
|
|
if err := os.Remove(preparePath(deletePath)); err != nil {
|
|
return err
|
|
}
|
|
// Recursively go down the next path and delete again.
|
|
if err := deleteFile(basePath, slashpath.Dir(deletePath)); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// DeleteFile - delete a file at path.
|
|
func (s *posix) DeleteFile(volume, path string) (err error) {
|
|
defer func() {
|
|
if err == syscall.EIO {
|
|
atomic.AddInt32(&s.ioErrCount, 1)
|
|
}
|
|
}()
|
|
|
|
if s.ioErrCount > maxAllowedIOError {
|
|
return errFaultyDisk
|
|
}
|
|
|
|
// Check disk availability.
|
|
if _, err = getDiskInfo(s.diskPath); err != nil {
|
|
return err
|
|
}
|
|
|
|
volumeDir, err := s.getVolDir(volume)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// Stat a volume entry.
|
|
_, err = os.Stat(preparePath(volumeDir))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return errVolumeNotFound
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Following code is needed so that we retain "/" suffix if any in
|
|
// path argument.
|
|
filePath := pathJoin(volumeDir, path)
|
|
if err = checkPathLength(filePath); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Delete file and delete parent directory as well if its empty.
|
|
return deleteFile(volumeDir, filePath)
|
|
}
|
|
|
|
// RenameFile - rename source path to destination path atomically.
|
|
func (s *posix) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err error) {
|
|
defer func() {
|
|
if err == syscall.EIO {
|
|
atomic.AddInt32(&s.ioErrCount, 1)
|
|
}
|
|
}()
|
|
|
|
if s.ioErrCount > maxAllowedIOError {
|
|
return errFaultyDisk
|
|
}
|
|
|
|
// Validate if disk is free.
|
|
if err = checkDiskFree(s.diskPath, s.minFreeDisk); err != nil {
|
|
return err
|
|
}
|
|
|
|
srcVolumeDir, err := s.getVolDir(srcVolume)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
dstVolumeDir, err := s.getVolDir(dstVolume)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// Stat a volume entry.
|
|
_, err = os.Stat(preparePath(srcVolumeDir))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return errVolumeNotFound
|
|
}
|
|
return err
|
|
}
|
|
_, err = os.Stat(preparePath(dstVolumeDir))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return errVolumeNotFound
|
|
}
|
|
}
|
|
|
|
srcIsDir := strings.HasSuffix(srcPath, slashSeparator)
|
|
dstIsDir := strings.HasSuffix(dstPath, slashSeparator)
|
|
// Either src and dst have to be directories or files, else return error.
|
|
if !(srcIsDir && dstIsDir || !srcIsDir && !dstIsDir) {
|
|
return errFileAccessDenied
|
|
}
|
|
srcFilePath := slashpath.Join(srcVolumeDir, srcPath)
|
|
if err = checkPathLength(srcFilePath); err != nil {
|
|
return err
|
|
}
|
|
dstFilePath := slashpath.Join(dstVolumeDir, dstPath)
|
|
if err = checkPathLength(dstFilePath); err != nil {
|
|
return err
|
|
}
|
|
if srcIsDir {
|
|
// If source is a directory we expect the destination to be non-existent always.
|
|
_, err = os.Stat(preparePath(dstFilePath))
|
|
if err == nil {
|
|
return errFileAccessDenied
|
|
}
|
|
if !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
// Destination does not exist, hence proceed with the rename.
|
|
}
|
|
// Creates all the parent directories, with mode 0777 mkdir honors system umask.
|
|
if err = mkdirAll(preparePath(slashpath.Dir(dstFilePath)), 0777); 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
|
|
} else if strings.Contains(err.Error(), "The system cannot find the path specified.") && runtime.GOOS == "windows" {
|
|
// This is a special case should be handled only for
|
|
// windows, because windows API does not return "not a
|
|
// directory" error message. Handle this specifically here.
|
|
return errFileAccessDenied
|
|
}
|
|
return err
|
|
}
|
|
// Finally attempt a rename.
|
|
err = os.Rename(preparePath(srcFilePath), preparePath(dstFilePath))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return errFileNotFound
|
|
}
|
|
return err
|
|
}
|
|
return nil
|
|
}
|