075b8903d7
This patch also reverts previous changes which were merged for migration to the newer disk format. We will be bringing these changes in subsequent releases. But we wish to add protection in this release such that future release migrations are protected. Revert "fs: Migration should handle bucketConfigs as regular objects. (#4482)" This reverts commit976870a391. Revert "fs: Migrate object metadata to objects directory. (#4195)" This reverts commit76f4f20609.
462 lines
13 KiB
Go
462 lines
13 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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"io"
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"os"
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pathutil "path"
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"runtime"
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)
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// Removes only the file at given path does not remove
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// any parent directories, handles long paths for
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// windows automatically.
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func fsRemoveFile(filePath string) (err error) {
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if filePath == "" {
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return traceError(errInvalidArgument)
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}
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if err = checkPathLength(filePath); err != nil {
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return traceError(err)
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}
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if err = os.Remove(preparePath(filePath)); err != nil {
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if os.IsNotExist(err) {
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return traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return traceError(errFileAccessDenied)
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}
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return traceError(err)
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}
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return nil
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}
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// Removes all files and folders at a given path, handles
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// long paths for windows automatically.
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func fsRemoveAll(dirPath string) (err error) {
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if dirPath == "" {
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return traceError(errInvalidArgument)
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}
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if err = checkPathLength(dirPath); err != nil {
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return traceError(err)
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}
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if err = removeAll(dirPath); err != nil {
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if os.IsPermission(err) {
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return traceError(errVolumeAccessDenied)
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}
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return traceError(err)
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}
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return nil
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}
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// Removes a directory only if its empty, handles long
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// paths for windows automatically.
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func fsRemoveDir(dirPath string) (err error) {
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if dirPath == "" {
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return traceError(errInvalidArgument)
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}
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if err = checkPathLength(dirPath); err != nil {
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return traceError(err)
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}
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if err = os.Remove(preparePath(dirPath)); err != nil {
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if os.IsNotExist(err) {
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return traceError(errVolumeNotFound)
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} else if isSysErrNotEmpty(err) {
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return traceError(errVolumeNotEmpty)
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}
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return traceError(err)
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}
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return nil
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}
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// Creates a new directory, parent dir should exist
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// otherwise returns an error. If directory already
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// exists returns an error. Windows long paths
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// are handled automatically.
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func fsMkdir(dirPath string) (err error) {
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if dirPath == "" {
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return traceError(errInvalidArgument)
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}
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if err = checkPathLength(dirPath); err != nil {
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return traceError(err)
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}
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if err = os.Mkdir(preparePath(dirPath), 0777); err != nil {
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if os.IsExist(err) {
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return traceError(errVolumeExists)
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} else if os.IsPermission(err) {
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return traceError(errDiskAccessDenied)
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} else if isSysErrNotDir(err) {
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// File path cannot be verified since
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// one of the parents is a file.
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return traceError(errDiskAccessDenied)
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} else if isSysErrPathNotFound(err) {
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// Add specific case for windows.
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return traceError(errDiskAccessDenied)
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}
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return traceError(err)
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}
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return nil
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}
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func fsStat(statLoc string) (os.FileInfo, error) {
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if statLoc == "" {
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return nil, traceError(errInvalidArgument)
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}
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if err := checkPathLength(statLoc); err != nil {
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return nil, traceError(err)
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}
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fi, err := osStat(preparePath(statLoc))
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if err != nil {
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return nil, traceError(err)
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}
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return fi, nil
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}
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// Lookup if directory exists, returns directory
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// attributes upon success.
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func fsStatDir(statDir string) (os.FileInfo, error) {
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fi, err := fsStat(statDir)
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if err != nil {
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err = errorCause(err)
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if os.IsNotExist(err) {
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return nil, traceError(errVolumeNotFound)
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} else if os.IsPermission(err) {
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return nil, traceError(errVolumeAccessDenied)
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}
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return nil, traceError(err)
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}
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if !fi.IsDir() {
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return nil, traceError(errVolumeAccessDenied)
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}
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return fi, nil
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}
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// Lookup if file exists, returns file attributes upon success
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func fsStatFile(statFile string) (os.FileInfo, error) {
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fi, err := fsStat(statFile)
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if err != nil {
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err = errorCause(err)
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if os.IsNotExist(err) {
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return nil, traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return nil, traceError(errFileAccessDenied)
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} else if isSysErrNotDir(err) {
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return nil, traceError(errFileAccessDenied)
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} else if isSysErrPathNotFound(err) {
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return nil, traceError(errFileNotFound)
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}
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return nil, traceError(err)
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}
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if fi.IsDir() {
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return nil, traceError(errFileAccessDenied)
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}
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return fi, nil
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}
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// Opens the file at given path, optionally from an offset. Upon success returns
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// a readable stream and the size of the readable stream.
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func fsOpenFile(readPath string, offset int64) (io.ReadCloser, int64, error) {
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if readPath == "" || offset < 0 {
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return nil, 0, traceError(errInvalidArgument)
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}
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if err := checkPathLength(readPath); err != nil {
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return nil, 0, traceError(err)
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}
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fr, err := os.Open(preparePath(readPath))
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if err != nil {
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if os.IsNotExist(err) {
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return nil, 0, traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return nil, 0, traceError(errFileAccessDenied)
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} else if isSysErrNotDir(err) {
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// File path cannot be verified since one of the parents is a file.
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return nil, 0, traceError(errFileAccessDenied)
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} else if isSysErrPathNotFound(err) {
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// Add specific case for windows.
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return nil, 0, traceError(errFileNotFound)
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}
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return nil, 0, traceError(err)
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}
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// Stat to get the size of the file at path.
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st, err := osStat(preparePath(readPath))
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if err != nil {
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return nil, 0, traceError(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 nil, 0, traceError(errIsNotRegular)
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}
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// Seek to the requested offset.
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if offset > 0 {
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_, err = fr.Seek(offset, os.SEEK_SET)
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if err != nil {
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return nil, 0, traceError(err)
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}
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}
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// Success.
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return fr, st.Size(), nil
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}
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// Creates a file and copies data from incoming reader. Staging buffer is used by io.CopyBuffer.
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func fsCreateFile(filePath string, reader io.Reader, buf []byte, fallocSize int64) (int64, error) {
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if filePath == "" || reader == nil {
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return 0, traceError(errInvalidArgument)
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}
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if err := checkPathLength(filePath); err != nil {
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return 0, traceError(err)
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}
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if err := mkdirAll(pathutil.Dir(filePath), 0777); err != nil {
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return 0, traceError(err)
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}
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if err := checkDiskFree(pathutil.Dir(filePath), fallocSize); err != nil {
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return 0, traceError(err)
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}
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writer, err := os.OpenFile(preparePath(filePath), os.O_CREATE|os.O_WRONLY, 0666)
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if err != nil {
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// File path cannot be verified since one of the parents is a file.
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if isSysErrNotDir(err) {
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return 0, traceError(errFileAccessDenied)
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}
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return 0, err
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}
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defer writer.Close()
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// Fallocate only if the size is final object is known.
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if fallocSize > 0 {
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if err = fsFAllocate(int(writer.Fd()), 0, fallocSize); err != nil {
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return 0, traceError(err)
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}
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}
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var bytesWritten int64
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if buf != nil {
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bytesWritten, err = io.CopyBuffer(writer, reader, buf)
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if err != nil {
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return 0, traceError(err)
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}
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} else {
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bytesWritten, err = io.Copy(writer, reader)
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if err != nil {
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return 0, traceError(err)
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}
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}
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return bytesWritten, nil
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}
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// Removes uploadID at destination path.
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func fsRemoveUploadIDPath(basePath, uploadIDPath string) error {
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if basePath == "" || uploadIDPath == "" {
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return traceError(errInvalidArgument)
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}
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if err := checkPathLength(basePath); err != nil {
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return traceError(err)
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}
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if err := checkPathLength(uploadIDPath); err != nil {
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return traceError(err)
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}
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// List all the entries in uploadID.
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entries, err := readDir(uploadIDPath)
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if err != nil && err != errFileNotFound {
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return traceError(err)
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}
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// Delete all the entries obtained from previous readdir.
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for _, entryPath := range entries {
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err = fsDeleteFile(basePath, pathJoin(uploadIDPath, entryPath))
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if err != nil && err != errFileNotFound {
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return traceError(err)
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}
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}
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return nil
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}
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// fsFAllocate is similar to Fallocate but provides a convenient
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// wrapper to handle various operating system specific errors.
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func fsFAllocate(fd int, offset int64, len int64) (err error) {
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e := Fallocate(fd, offset, len)
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// Ignore errors when Fallocate is not supported in the current system
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if e != nil && !isSysErrNoSys(e) && !isSysErrOpNotSupported(e) {
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switch {
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case isSysErrNoSpace(e):
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err = errDiskFull
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case isSysErrIO(e):
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err = e
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default:
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// For errors: EBADF, EINTR, EINVAL, ENODEV, EPERM, ESPIPE and ETXTBSY
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// Appending was failed anyway, returns unexpected error
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err = errUnexpected
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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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// Renames source path to destination path, creates all the
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// missing parents if they don't exist.
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func fsRenameFile(sourcePath, destPath string) error {
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if err := checkPathLength(sourcePath); err != nil {
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return traceError(err)
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}
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if err := checkPathLength(destPath); err != nil {
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return traceError(err)
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}
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// Verify if source path exists.
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if _, err := os.Stat(preparePath(sourcePath)); err != nil {
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if os.IsNotExist(err) {
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return traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return traceError(errFileAccessDenied)
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} else if isSysErrPathNotFound(err) {
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return traceError(errFileNotFound)
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} else if isSysErrNotDir(err) {
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// File path cannot be verified since one of the parents is a file.
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return traceError(errFileAccessDenied)
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}
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return traceError(err)
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}
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if err := mkdirAll(pathutil.Dir(destPath), 0777); err != nil {
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return traceError(err)
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}
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if err := os.Rename(preparePath(sourcePath), preparePath(destPath)); err != nil {
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return traceError(err)
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}
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return nil
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}
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// Delete a file and its parent if it is empty at the destination path.
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// this function additionally protects the basePath from being deleted.
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func fsDeleteFile(basePath, deletePath string) error {
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if err := checkPathLength(basePath); err != nil {
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return traceError(err)
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}
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if err := checkPathLength(deletePath); err != nil {
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return traceError(err)
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}
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if basePath == deletePath {
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return nil
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}
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// Verify if the path exists.
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pathSt, err := osStat(preparePath(deletePath))
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if err != nil {
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if os.IsNotExist(err) {
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return traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return traceError(errFileAccessDenied)
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}
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return traceError(err)
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}
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if pathSt.IsDir() && !isDirEmpty(deletePath) {
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// Verify if directory is empty.
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return nil
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}
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// Attempt to remove path.
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if err = os.Remove(preparePath(deletePath)); err != nil {
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if os.IsNotExist(err) {
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return traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return traceError(errFileAccessDenied)
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} else if isSysErrNotEmpty(err) {
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return traceError(errVolumeNotEmpty)
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}
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return traceError(err)
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}
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// Recursively go down the next path and delete again.
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if err := fsDeleteFile(basePath, pathutil.Dir(deletePath)); err != nil {
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return err
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}
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return nil
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}
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// fsRemoveMeta safely removes a locked file and takes care of Windows special case
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func fsRemoveMeta(basePath, deletePath, tmpDir string) error {
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// Special case for windows please read through.
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if runtime.GOOS == globalWindowsOSName {
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// Ordinarily windows does not permit deletion or renaming of files still
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// in use, but if all open handles to that file were opened with FILE_SHARE_DELETE
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// then it can permit renames and deletions of open files.
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//
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// There are however some gotchas with this, and it is worth listing them here.
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// Firstly, Windows never allows you to really delete an open file, rather it is
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// flagged as delete pending and its entry in its directory remains visible
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// (though no new file handles may be opened to it) and when the very last
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// open handle to the file in the system is closed, only then is it truly
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// deleted. Well, actually only sort of truly deleted, because Windows only
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// appears to remove the file entry from the directory, but in fact that
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// entry is merely hidden and actually still exists and attempting to create
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// a file with the same name will return an access denied error. How long it
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// silently exists for depends on a range of factors, but put it this way:
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// if your code loops creating and deleting the same file name as you might
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// when operating a lock file, you're going to see lots of random spurious
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// access denied errors and truly dismal lock file performance compared to POSIX.
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//
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// We work-around these un-POSIX file semantics by taking a dual step to
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// deleting files. Firstly, it renames the file to tmp location into multipartTmpBucket
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// We always open files with FILE_SHARE_DELETE permission enabled, with that
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// flag Windows permits renaming and deletion, and because the name was changed
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// to a very random name somewhere not in its origin directory before deletion,
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// you don't see those unexpected random errors when creating files with the
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// same name as a recently deleted file as you do anywhere else on Windows.
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// Because the file is probably not in its original containing directory any more,
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// deletions of that directory will not fail with "directory not empty" as they
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// otherwise normally would either.
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tmpPath := pathJoin(tmpDir, mustGetUUID())
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fsRenameFile(deletePath, tmpPath)
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// Proceed to deleting the directory if empty
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fsDeleteFile(basePath, pathutil.Dir(deletePath))
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// Finally delete the renamed file.
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return fsDeleteFile(tmpDir, tmpPath)
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}
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return fsDeleteFile(basePath, deletePath)
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}
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