91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
//go:build linux
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// +build linux
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// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// This file has been adopted and then modified from Daniel Swarbrick's smart
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// project residing at https://github.com/dswarbrick/smart
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//
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package smart
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import (
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"fmt"
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"math/big"
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"unsafe"
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"github.com/dswarbrick/smart/ioctl"
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"golang.org/x/sys/unix"
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)
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// NVMe admin disk query constants
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const (
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NvmeAdminGetLogPage = 0x02
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NvmeAdminIdentify = 0x06
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)
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var (
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nvmeIoctlAdminCmd = ioctl.Iowr('N', 0x41, unsafe.Sizeof(nvmePassthruCommand{}))
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)
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// NewNVMeDevice creates a new NVMeDevice struct with name
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func NewNVMeDevice(name string) *NVMeDevice {
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return &NVMeDevice{name, -1}
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}
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// Open - open device file to find kernel info
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func (d *NVMeDevice) Open() (err error) {
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d.fd, err = unix.Open(d.Name, unix.O_RDWR, 0600)
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return err
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}
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// Close - closes device file
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func (d *NVMeDevice) Close() error {
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return unix.Close(d.fd)
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}
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func (d *NVMeDevice) readLogPage(logID uint8, buf *[]byte) error {
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bufLen := len(*buf)
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if (bufLen < 4) || (bufLen > 0x4000) || (bufLen%4 != 0) {
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return fmt.Errorf("Invalid buffer size")
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}
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cmd := nvmePassthruCommand{
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opcode: NvmeAdminGetLogPage,
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nsid: 0xffffffff, // FIXME
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addr: uint64(uintptr(unsafe.Pointer(&(*buf)[0]))),
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dataLen: uint32(bufLen),
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cdw10: uint32(logID) | (((uint32(bufLen) / 4) - 1) << 16),
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}
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return ioctl.Ioctl(uintptr(d.fd), nvmeIoctlAdminCmd, uintptr(unsafe.Pointer(&cmd)))
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}
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// le128ToBigInt takes a little-endian 16-byte slice and returns a *big.Int representing it.
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func le128ToBigInt(buf [16]byte) *big.Int {
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// Int.SetBytes() expects big-endian input, so reverse the bytes locally first
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rev := make([]byte, 16)
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for x := 0; x < 16; x++ {
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rev[x] = buf[16-x-1]
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}
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return new(big.Int).SetBytes(rev)
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}
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