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minio/pkg/utils/scsi/scsi.go

103 lines
2.5 KiB

// +build linux,amd64
/*
* Minimalist Object Storage, (C) 2015 Minio, 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.
*/
package scsi
import (
"errors"
"io/ioutil"
"path/filepath"
"github.com/minio/minio/pkg/iodine"
)
// NOTE : supporting virtio based scsi devices is out of scope for this implementation
// Attributes Scsi device attributes
type Attributes map[string]string
// Disks is a list of scsis disks and attributes
type Disks map[string]Attributes
// Get get disk scsi params
func (d Disks) Get(disk string) Attributes {
return d[disk]
}
// Len return len of total disks
func (d Disks) Len() int {
return len(d)
}
// GetDisks - get system devices list
func GetDisks() (Disks, error) {
var scsidevices []string
var scsiAttrList []string
d := Disks{}
sysFiles, err := ioutil.ReadDir(sysFSDEVICES)
if err != nil {
// may be an amazon instance, ignore this
return Disks{}, nil
}
scsidevices = filterdisks(sysFiles)
if len(scsidevices) == 0 {
// may be a docker instance, ignore this
return Disks{}, nil
}
for _, s := range scsidevices {
scsiAttrPath := filepath.Join(sysFSDEVICES, s)
scsiAttrs, err := ioutil.ReadDir(scsiAttrPath)
if err != nil {
return Disks{}, iodine.New(err, nil)
}
scsiBlockPath := filepath.Join(sysFSDEVICES, s, sysFSBLOCK)
scsidevList, err := ioutil.ReadDir(scsiBlockPath)
if err != nil {
return Disks{}, iodine.New(err, nil)
}
if len(scsidevList) > 1 {
return Disks{}, iodine.New(errors.New("Scsi address points to multiple block devices"), nil)
}
device := filepath.Join(udev, scsidevList[0].Name())
for _, sa := range scsiAttrs {
// Skip directories
if sa.IsDir() {
continue
}
// Skip symlinks
if !sa.Mode().IsRegular() {
continue
}
// Skip, not readable, write-only
if sa.Mode().Perm() == 128 {
continue
}
scsiAttrList = append(scsiAttrList, sa.Name())
}
if len(scsiAttrList) == 0 {
return Disks{}, iodine.New(errors.New("No scsi attributes found"), nil)
}
d[device] = getattrs(scsiAttrPath, scsiAttrList)
}
return d, nil
}