This change removes the ReadFileWithVerify function from the StorageAPI. The ReadFile was basically a redirection to ReadFileWithVerify. This change removes the redirection and moves the logic of ReadFileWithVerify directly into ReadFile. This removes a lot of unnecessary code in all StorageAPI implementations. Fixes #4946 * review: fix doc and typos
1002 lines
24 KiB
Go
1002 lines
24 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016, 2017 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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"encoding/hex"
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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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"sync"
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"sync/atomic"
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"syscall"
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humanize "github.com/dustin/go-humanize"
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"github.com/minio/minio/pkg/disk"
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)
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const (
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diskMinFreeSpace = 1 * humanize.GiByte // Min 1GiB free space.
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diskMinTotalSpace = diskMinFreeSpace // Min 1GiB total space.
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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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pool sync.Pool
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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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// 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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// Convert any '\' to '/'.
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pathName = filepath.ToSlash(pathName)
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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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if !os.IsNotExist(err) {
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errorIf(err, "Unable to access directory")
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}
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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 != io.EOF {
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if !os.IsNotExist(err) {
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errorIf(err, "Unable to list directory")
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}
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return false
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}
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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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// Initialize a new storage disk.
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func newPosix(path string) (StorageAPI, error) {
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if path == "" {
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return nil, errInvalidArgument
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}
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// Disallow relative paths, figure out absolute paths.
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diskPath, err := filepath.Abs(path)
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if err != nil {
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return nil, err
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}
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st := &posix{
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diskPath: diskPath,
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// 1MiB buffer pool for posix internal operations.
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pool: sync.Pool{
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New: func() interface{} {
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b := make([]byte, readSizeV1)
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return &b
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},
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},
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}
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fi, err := osStat((diskPath))
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if err == nil {
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if !fi.IsDir() {
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return nil, syscall.ENOTDIR
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}
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}
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if os.IsNotExist(err) {
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// Disk not found create it.
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err = os.MkdirAll(diskPath, 0777)
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if err != nil {
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return nil, err
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}
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}
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di, err := getDiskInfo((diskPath))
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if err != nil {
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return nil, err
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}
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// Check if disk has minimum required total space.
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if err = checkDiskMinTotal(di); err != nil {
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return nil, err
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}
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// Success.
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return st, 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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// List of operating systems where we ignore disk space
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// verification.
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var ignoreDiskFreeOS = []string{
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globalWindowsOSName,
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globalNetBSDOSName,
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globalSolarisOSName,
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}
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// check if disk total has minimum required size.
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func checkDiskMinTotal(di disk.Info) (err error) {
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// Remove 5% from total space for cumulative disk space
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// used for journalling, inodes etc.
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totalDiskSpace := float64(di.Total) * 0.95
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if int64(totalDiskSpace) <= diskMinTotalSpace {
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return errDiskFull
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}
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return nil
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}
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// check if disk free has minimum required size.
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func checkDiskMinFree(di disk.Info) error {
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// Remove 5% from free space for cumulative disk space used for journalling, inodes etc.
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availableDiskSpace := float64(di.Free) * 0.95
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if int64(availableDiskSpace) <= diskMinFreeSpace {
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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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// checkDiskFree verifies if disk path has sufficient minimum free disk space and files.
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func checkDiskFree(diskPath string, neededSpace int64) (err error) {
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// We don't validate disk space or inode utilization on windows.
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// Each windows call to 'GetVolumeInformationW' takes around
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// 3-5seconds. And StatDISK is not supported by Go for solaris
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// and netbsd.
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if contains(ignoreDiskFreeOS, runtime.GOOS) {
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return nil
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}
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var di disk.Info
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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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if err = checkDiskMinFree(di); err != nil {
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return err
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}
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// Check if we have enough space to store data
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if neededSpace > int64(float64(di.Free)*0.95) {
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return errDiskFull
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}
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return nil
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}
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// Implements stringer compatible interface.
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func (s *posix) String() string {
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return s.diskPath
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}
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// Init - this is a dummy call.
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func (s *posix) Init() error {
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return nil
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}
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// Close - this is a dummy call.
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func (s *posix) Close() error {
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return nil
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}
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// DiskInfo provides current information about disk space usage,
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// total free inodes and underlying filesystem.
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func (s *posix) DiskInfo() (info disk.Info, err error) {
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return getDiskInfo((s.diskPath))
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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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// checkDiskFound - validates if disk is available,
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// returns errDiskNotFound if not found.
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func (s *posix) checkDiskFound() (err error) {
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_, err = osStat((s.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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} else if isSysErrTooLong(err) {
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return errFileNameTooLong
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}
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}
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return err
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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 atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
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return errFaultyDisk
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}
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if err = s.checkDiskFound(); 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((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 atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
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return nil, errFaultyDisk
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}
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if err = s.checkDiskFound(); err != nil {
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return nil, err
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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 !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 = osStat((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 osStat() 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 atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
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return VolInfo{}, errFaultyDisk
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}
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if err = s.checkDiskFound(); 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 = osStat((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 osStat() 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 atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
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return errFaultyDisk
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}
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if err = s.checkDiskFound(); 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((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 isSysErrNotEmpty(err) {
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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 atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
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return nil, errFaultyDisk
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}
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if err = s.checkDiskFound(); 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 = osStat((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 atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
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return nil, errFaultyDisk
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}
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if err = s.checkDiskFound(); 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 = osStat((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((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 isSysErrHandleInvalid(pathErr.Err) {
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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.
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//
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// If an EOF happens after reading some but not all the bytes,
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// ReadFile returns ErrUnexpectedEOF.
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//
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// If the BitrotVerifier is not nil or not verified ReadFile
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// tries to verify whether the disk has bitrot.
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//
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// Additionally ReadFile also starts reading from an offset. ReadFile
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// semantics are same as io.ReadFull.
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func (s *posix) ReadFile(volume, path string, offset int64, buffer []byte, verifier *BitrotVerifier) (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 atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
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return 0, errFaultyDisk
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}
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if err = s.checkDiskFound(); 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 = osStat((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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}
|
|
|
|
// Validate effective path length before reading.
|
|
filePath := pathJoin(volumeDir, path)
|
|
if err = checkPathLength((filePath)); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
// Open the file for reading.
|
|
file, err := os.Open((filePath))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return 0, errFileNotFound
|
|
} else if os.IsPermission(err) {
|
|
return 0, errFileAccessDenied
|
|
} else if isSysErrNotDir(err) {
|
|
return 0, errFileAccessDenied
|
|
}
|
|
return 0, err
|
|
}
|
|
|
|
// Close the file descriptor.
|
|
defer file.Close()
|
|
|
|
st, err := file.Stat()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
// Verify it is a regular file, otherwise subsequent Seek is
|
|
// undefined.
|
|
if !st.Mode().IsRegular() {
|
|
return 0, errIsNotRegular
|
|
}
|
|
|
|
if verifier != nil && !verifier.IsVerified() {
|
|
bufp := s.pool.Get().(*[]byte)
|
|
defer s.pool.Put(bufp)
|
|
|
|
if offset != 0 {
|
|
if _, err = io.CopyBuffer(verifier, io.LimitReader(file, offset), *bufp); err != nil {
|
|
return 0, err
|
|
}
|
|
}
|
|
if _, err = file.Read(buffer); err != nil {
|
|
return 0, err
|
|
}
|
|
if _, err = verifier.Write(buffer); err != nil {
|
|
return 0, err
|
|
}
|
|
if _, err = io.CopyBuffer(verifier, file, *bufp); err != nil {
|
|
return 0, err
|
|
}
|
|
if !verifier.Verify() {
|
|
return 0, hashMismatchError{hex.EncodeToString(verifier.sum), hex.EncodeToString(verifier.Sum(nil))}
|
|
}
|
|
return int64(len(buffer)), err
|
|
}
|
|
|
|
m, err := file.ReadAt(buffer, offset)
|
|
if m > 0 && m < len(buffer) {
|
|
err = io.ErrUnexpectedEOF
|
|
}
|
|
return int64(m), err
|
|
}
|
|
|
|
func (s *posix) createFile(volume, path string) (f *os.File, err error) {
|
|
defer func() {
|
|
if err == syscall.EIO {
|
|
atomic.AddInt32(&s.ioErrCount, 1)
|
|
}
|
|
}()
|
|
|
|
if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
|
|
return nil, errFaultyDisk
|
|
}
|
|
|
|
if err = s.checkDiskFound(); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
volumeDir, err := s.getVolDir(volume)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Stat a volume entry.
|
|
_, err = osStat((volumeDir))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return nil, errVolumeNotFound
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
filePath := pathJoin(volumeDir, path)
|
|
if err = checkPathLength((filePath)); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Verify if the file already exists and is not of regular type.
|
|
var st os.FileInfo
|
|
if st, err = osStat((filePath)); err == nil {
|
|
if !st.Mode().IsRegular() {
|
|
return nil, errIsNotRegular
|
|
}
|
|
} else {
|
|
// Create top level directories if they don't exist.
|
|
// with mode 0777 mkdir honors system umask.
|
|
if err = os.MkdirAll(slashpath.Dir(filePath), 0777); err != nil {
|
|
// File path cannot be verified since one of the parents is a file.
|
|
if isSysErrNotDir(err) {
|
|
return nil, errFileAccessDenied
|
|
} else if isSysErrPathNotFound(err) {
|
|
// Add specific case for windows.
|
|
return nil, errFileAccessDenied
|
|
}
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
w, err := os.OpenFile((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 isSysErrNotDir(err) {
|
|
return nil, errFileAccessDenied
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
return w, nil
|
|
}
|
|
|
|
// PrepareFile - run prior actions before creating a new file for optimization purposes
|
|
// Currently we use fallocate when available to avoid disk fragmentation as much as possible
|
|
func (s *posix) PrepareFile(volume, path string, fileSize int64) (err error) {
|
|
// It doesn't make sense to create a negative-sized file
|
|
if fileSize <= 0 {
|
|
return errInvalidArgument
|
|
}
|
|
|
|
defer func() {
|
|
if err == syscall.EIO {
|
|
atomic.AddInt32(&s.ioErrCount, 1)
|
|
}
|
|
}()
|
|
|
|
if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
|
|
return errFaultyDisk
|
|
}
|
|
|
|
// Validate if disk is indeed free.
|
|
if err = checkDiskFree(s.diskPath, fileSize); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Create file if not found
|
|
w, err := s.createFile(volume, path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Close upon return.
|
|
defer w.Close()
|
|
|
|
// Allocate needed disk space to append data
|
|
e := Fallocate(int(w.Fd()), 0, fileSize)
|
|
|
|
// Ignore errors when Fallocate is not supported in the current system
|
|
if e != nil && !isSysErrNoSys(e) && !isSysErrOpNotSupported(e) {
|
|
switch {
|
|
case isSysErrNoSpace(e):
|
|
err = errDiskFull
|
|
case isSysErrIO(e):
|
|
err = e
|
|
default:
|
|
// For errors: EBADF, EINTR, EINVAL, ENODEV, EPERM, ESPIPE and ETXTBSY
|
|
// Appending was failed anyway, returns unexpected error
|
|
err = errUnexpected
|
|
}
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// AppendFile - append a byte array at path, if file doesn't exist at
|
|
// path this call explicitly creates it.
|
|
func (s *posix) AppendFile(volume, path string, buf []byte) (err error) {
|
|
defer func() {
|
|
if err == syscall.EIO {
|
|
atomic.AddInt32(&s.ioErrCount, 1)
|
|
}
|
|
}()
|
|
|
|
if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
|
|
return errFaultyDisk
|
|
}
|
|
|
|
// Create file if not found
|
|
w, err := s.createFile(volume, path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
_, err = w.Write(buf)
|
|
w.Close()
|
|
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 atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
|
|
return FileInfo{}, errFaultyDisk
|
|
}
|
|
|
|
if err = s.checkDiskFound(); err != nil {
|
|
return FileInfo{}, err
|
|
}
|
|
|
|
volumeDir, err := s.getVolDir(volume)
|
|
if err != nil {
|
|
return FileInfo{}, err
|
|
}
|
|
// Stat a volume entry.
|
|
_, err = osStat((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 := osStat((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 isSysErrNotDir(err) {
|
|
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 deletes a file path if its empty. If it's successfully deleted,
|
|
// it will recursively move up the tree, deleting empty parent directories
|
|
// until it finds one with files in it. Returns nil for a non-empty directory.
|
|
func deleteFile(basePath, deletePath string) error {
|
|
if basePath == deletePath {
|
|
return nil
|
|
}
|
|
|
|
// Attempt to remove path.
|
|
if err := os.Remove((deletePath)); err != nil {
|
|
// Ignore errors if the directory is not empty. The server relies on
|
|
// this functionality, and sometimes uses recursion that should not
|
|
// error on parent directories.
|
|
if isSysErrNotEmpty(err) {
|
|
return nil
|
|
}
|
|
|
|
if os.IsNotExist(err) {
|
|
return errFileNotFound
|
|
} else if os.IsPermission(err) {
|
|
return errFileAccessDenied
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Recursively go down the next path and delete again.
|
|
// Errors for parent directories shouldn't trickle down.
|
|
deleteFile(basePath, slashpath.Dir(deletePath))
|
|
|
|
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 atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
|
|
return errFaultyDisk
|
|
}
|
|
|
|
if err = s.checkDiskFound(); err != nil {
|
|
return err
|
|
}
|
|
|
|
volumeDir, err := s.getVolDir(volume)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// Stat a volume entry.
|
|
_, err = osStat((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 atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
|
|
return errFaultyDisk
|
|
}
|
|
|
|
if err = s.checkDiskFound(); 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 = osStat((srcVolumeDir))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return errVolumeNotFound
|
|
}
|
|
return err
|
|
}
|
|
_, err = osStat((dstVolumeDir))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return errVolumeNotFound
|
|
}
|
|
}
|
|
|
|
srcIsDir := hasSuffix(srcPath, slashSeparator)
|
|
dstIsDir := 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 = osStat((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 = os.MkdirAll(slashpath.Dir(dstFilePath), 0777); err != nil {
|
|
// File path cannot be verified since one of the parents is a file.
|
|
if isSysErrNotDir(err) {
|
|
return errFileAccessDenied
|
|
} else if isSysErrPathNotFound(err) {
|
|
// 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((srcFilePath), (dstFilePath))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return errFileNotFound
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Remove parent dir of the source file if empty
|
|
if parentDir := slashpath.Dir(srcFilePath); isDirEmpty(parentDir) {
|
|
deleteFile(srcVolumeDir, parentDir)
|
|
}
|
|
|
|
return nil
|
|
}
|