tidb storage_unix 源码
tidb storage_unix 代码
文件路径：/br/pkg/lightning/common/storage_unix.go
// Copyright 2019 PingCAP, Inc.
//
// 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.
//go:build !windows
// TODO: Deduplicate this implementation with DM!
package common
import (
"reflect"
"syscall"
"github.com/pingcap/errors"
"github.com/pingcap/failpoint"
"golang.org/x/sys/unix"
)
// GetStorageSize gets storage's capacity and available size
func GetStorageSize(dir string) (size StorageSize, err error) {
failpoint.Inject("GetStorageSize", func(val failpoint.Value) {
injectedSize := val.(int)
failpoint.Return(StorageSize{Capacity: uint64(injectedSize), Available: uint64(injectedSize)}, nil)
})
var stat unix.Statfs_t
err = unix.Statfs(dir, &stat)
if err != nil {
return size, errors.Annotatef(err, "cannot get disk capacity at %s", dir)
}
// When container is run in MacOS, `bsize` obtained by `statfs` syscall is not the fundamental block size,
// but the `iosize` (optimal transfer block size) instead, it's usually 1024 times larger than the `bsize`.
// for example `4096 * 1024`. To get the correct block size, we should use `frsize`. But `frsize` isn't
// guaranteed to be supported everywhere, so we need to check whether it's supported before use it.
// For more details, please refer to: https://github.com/docker/for-mac/issues/2136
bSize := uint64(stat.Bsize)
field := reflect.ValueOf(&stat).Elem().FieldByName("Frsize")
if field.IsValid() {
if field.Kind() == reflect.Uint64 {
bSize = field.Uint()
} else {
bSize = uint64(field.Int())
}
}
// Available blocks * size per block = available space in bytes
size.Available = uint64(stat.Bavail) * bSize
size.Capacity = stat.Blocks * bSize
return
}
// SameDisk is used to check dir1 and dir2 in the same disk.
func SameDisk(dir1 string, dir2 string) (bool, error) {
st1 := syscall.Stat_t{}
st2 := syscall.Stat_t{}
if err := syscall.Stat(dir1, &st1); err != nil {
return false, err
}
if err := syscall.Stat(dir2, &st2); err != nil {
return false, err
}
return st1.Dev == st2.Dev, nil
}
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