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