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minio/pkg/scsi/scsi_linux.go

171 lines
3.7 KiB

/*
* Mini Object Storage, (C) 2014 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.
*/
// !build linux,amd64
package scsi
import (
"errors"
"io/ioutil"
"path"
)
// NOTE : supporting virtio based scsi devices
// is out of scope for this implementation
type Scsi struct {
Disk string
Scsiattrmap map[string][]byte
Diskattrmap map[string][]byte
}
type Devices struct {
List []Scsi
}
func (d *Devices) getInfo(disk string) (map[string][]byte, error) {
var diskAttrsList []string
var diskQueueAttrs []string
aggrAttrMap := make(map[string][]byte)
sysfs_block_dev := path.Join(SYSFS_BLOCK + disk)
sysfs_block_dev_queue := path.Join(sysfs_block_dev + "/queue")
scsiFiles, err := ioutil.ReadDir(sysfs_block_dev)
if err != nil {
return nil, err
}
scsiQueueFiles, err := ioutil.ReadDir(sysfs_block_dev_queue)
if err != nil {
return nil, err
}
for _, sf := range scsiFiles {
if sf.IsDir() {
continue
}
// Skip symlinks
if !sf.Mode().IsRegular() {
continue
}
// Skip, not readable, write-only
if sf.Mode().Perm() == 128 {
continue
}
diskAttrsList = append(diskAttrsList, sf.Name())
}
for _, sf := range scsiQueueFiles {
if sf.IsDir() {
continue
}
// Skip symlinks
if !sf.Mode().IsRegular() {
continue
}
// Skip, not readable, write-only
if sf.Mode().Perm() == 128 {
continue
}
diskQueueAttrs = append(diskQueueAttrs, sf.Name())
}
if len(diskAttrsList) == 0 {
return nil, errors.New("No disk attributes found")
}
if len(diskQueueAttrs) == 0 {
return nil, errors.New("No disk queue attributes found")
}
diskAttrMap := getattrs(sysfs_block_dev, diskAttrsList)
diskQueueAttrMap := getattrs(sysfs_block_dev_queue, diskQueueAttrs)
for k, v := range diskAttrMap {
aggrAttrMap[k] = v
}
for k, v := range diskQueueAttrMap {
aggrAttrMap[k] = v
}
return aggrAttrMap, nil
}
func (d *Devices) Get() error {
var scsidevices []string
var scsiAttrList []string
sysFiles, err := ioutil.ReadDir(SYSFS_SCSI_DEVICES)
if err != nil {
return err
}
scsidevices = filterdevices(sysFiles)
if len(scsidevices) == 0 {
return errors.New("No scsi devices found on the system")
}
for _, scsi := range scsidevices {
var _scsi Scsi
scsiAttrPath := path.Join(SYSFS_SCSI_DEVICES, scsi, "/")
scsiAttrs, err := ioutil.ReadDir(scsiAttrPath)
if err != nil {
return err
}
scsiBlockPath := path.Join(SYSFS_SCSI_DEVICES, scsi, "/block")
scsidevList, err := ioutil.ReadDir(scsiBlockPath)
if err != nil {
return err
}
if len(scsidevList) > 1 {
return errors.New("Scsi address points to multiple block devices")
}
_scsi.Disk = 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 errors.New("No scsi attributes found")
}
attrMap := getattrs(scsiAttrPath, scsiAttrList)
_scsi.Scsiattrmap = attrMap
_scsi.Diskattrmap, err = d.getInfo(scsidevList[0].Name())
if err != nil {
return err
}
d.List = append(d.List, _scsi)
}
return nil
}