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Copy pathnvme.go
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89 lines (73 loc) · 2.28 KB
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// +build linux
/*
* MinIO Cloud Storage, (C) 2016-2020 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.
*/
/*
* This file has been adopted and then modified from Daniel Swarbrick's smart
* project residing at https://github.com/dswarbrick/smart
*
*/
package smart
import (
"fmt"
"math/big"
"unsafe"
"github.com/dswarbrick/smart/ioctl"
"golang.org/x/sys/unix"
)
// NVMe admin disk query constants
const (
NvmeAdminGetLogPage = 0x02
NvmeAdminIdentify = 0x06
)
var (
nvmeIoctlAdminCmd = ioctl.Iowr('N', 0x41, unsafe.Sizeof(nvmePassthruCommand{}))
)
// NewNVMeDevice creates a new NVMeDevice struct with name
func NewNVMeDevice(name string) *NVMeDevice {
return &NVMeDevice{name, -1}
}
// Open - open device file to find kernel info
func (d *NVMeDevice) Open() (err error) {
d.fd, err = unix.Open(d.Name, unix.O_RDWR, 0600)
return err
}
// Close - closes device file
func (d *NVMeDevice) Close() error {
return unix.Close(d.fd)
}
func (d *NVMeDevice) readLogPage(logID uint8, buf *[]byte) error {
bufLen := len(*buf)
if (bufLen < 4) || (bufLen > 0x4000) || (bufLen%4 != 0) {
return fmt.Errorf("Invalid buffer size")
}
cmd := nvmePassthruCommand{
opcode: NvmeAdminGetLogPage,
nsid: 0xffffffff, // FIXME
addr: uint64(uintptr(unsafe.Pointer(&(*buf)[0]))),
dataLen: uint32(bufLen),
cdw10: uint32(logID) | (((uint32(bufLen) / 4) - 1) << 16),
}
return ioctl.Ioctl(uintptr(d.fd), nvmeIoctlAdminCmd, uintptr(unsafe.Pointer(&cmd)))
}
// le128ToBigInt takes a little-endian 16-byte slice and returns a *big.Int representing it.
func le128ToBigInt(buf [16]byte) *big.Int {
// Int.SetBytes() expects big-endian input, so reverse the bytes locally first
rev := make([]byte, 16)
for x := 0; x < 16; x++ {
rev[x] = buf[16-x-1]
}
return new(big.Int).SetBytes(rev)
}