/
blobfile.go
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/
blobfile.go
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// Copyright 2022 The CubeFS Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
package core
import (
"os"
"path/filepath"
"syscall"
"github.com/cubefs/cubefs/blobstore/blobnode/base"
"github.com/cubefs/cubefs/blobstore/blobnode/sys"
"github.com/cubefs/cubefs/blobstore/util/mergetask"
)
type RawFile interface {
Name() string
Fd() uintptr
ReadAt(b []byte, off int64) (n int, err error)
WriteAt(b []byte, off int64) (n int, err error)
Stat() (info os.FileInfo, err error)
Sync() error
Close() error
}
type BlobFile interface {
RawFile
Allocate(off int64, size int64) (err error)
Discard(off int64, size int64) (err error)
SysStat() (sysstat syscall.Stat_t, err error)
}
type blobFile struct {
file RawFile
syncHandler *mergetask.MergeTask
handleIOError func(err error)
}
func (ef *blobFile) Name() string {
return ef.file.Name()
}
func (ef *blobFile) Fd() uintptr {
return ef.file.Fd()
}
func (ef *blobFile) ReadAt(b []byte, off int64) (n int, err error) {
n, err = ef.file.ReadAt(b, off)
ef.handleError(err)
return
}
func (ef *blobFile) WriteAt(b []byte, off int64) (n int, err error) {
n, err = ef.file.WriteAt(b, off)
ef.handleError(err)
return
}
func (ef *blobFile) Stat() (info os.FileInfo, err error) {
info, err = ef.file.Stat()
ef.handleError(err)
return
}
func (ef *blobFile) Allocate(off int64, size int64) (err error) {
err = sys.PreAllocate(ef.file.Fd(), off, size)
ef.handleError(err)
return
}
func (ef *blobFile) Discard(off int64, size int64) (err error) {
err = sys.PunchHole(ef.file.Fd(), off, size)
ef.handleError(err)
return
}
func (ef *blobFile) SysStat() (sysstat syscall.Stat_t, err error) {
stat, err := ef.file.Stat()
ef.handleError(err)
if err != nil {
return sysstat, err
}
sysstat = *(stat.Sys().(*syscall.Stat_t))
return sysstat, err
}
func (ef *blobFile) Sync() error {
err := ef.syncHandler.Do(nil)
ef.handleError(err)
return err
}
func (ef *blobFile) Close() error {
return ef.file.Close()
}
func (ef *blobFile) handleError(err error) {
if base.IsEIO(err) && ef.handleIOError != nil {
ef.handleIOError(err)
}
}
func AlignSize(p int64, bound int64) (r int64) {
r = (p + bound - 1) & (^(bound - 1))
return r
}
func OpenFile(filename string, createIfMiss bool) (*os.File, error) {
fileExists, err := base.IsFileExists(filename)
if err != nil {
return nil, err
}
if !fileExists && !createIfMiss {
return nil, os.ErrNotExist
}
flag := os.O_RDWR
if !fileExists {
if err = os.MkdirAll(filepath.Dir(filename), 0o755); err != nil {
return nil, err
}
flag = os.O_RDWR | os.O_CREATE | os.O_EXCL | os.O_TRUNC
}
file, err := os.OpenFile(filename, flag, 0o644)
if err != nil {
return nil, err
}
return file, nil
}
func NewBlobFile(file RawFile, handleIOError func(err error)) BlobFile {
ef := &blobFile{
file: file,
handleIOError: handleIOError,
}
ef.syncHandler = mergetask.NewMergeTask(-1, func(interface{}) error {
return ef.file.Sync()
})
return ef
}