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proxmox-backup/pbs-tape/src/sgutils2.rs

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//! Bindings for libsgutils2
//!
//! Incomplete, but we currently do not need more.
//!
//! See: `/usr/include/scsi/sg_pt.h`
//!
//! The SCSI Commands Reference Manual also contains some useful information.
use std::ffi::CStr;
use std::os::unix::io::AsRawFd;
use std::ptr::NonNull;
use anyhow::{bail, format_err, Error};
use endian_trait::Endian;
use libc::{c_char, c_int};
use serde::{Deserialize, Serialize};
use proxmox_io::ReadExt;
#[derive(thiserror::Error, Debug)]
pub struct SenseInfo {
pub sense_key: u8,
pub asc: u8,
pub ascq: u8,
}
impl std::fmt::Display for SenseInfo {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let sense_text = SENSE_KEY_DESCRIPTIONS
.get(self.sense_key as usize)
.map(|s| String::from(*s))
.unwrap_or_else(|| format!("Invalid sense {:02X}", self.sense_key));
if self.asc == 0 && self.ascq == 0 {
write!(f, "{}", sense_text)
} else {
let additional_sense_text = get_asc_ascq_string(self.asc, self.ascq);
write!(f, "{}, {}", sense_text, additional_sense_text)
}
}
}
#[derive(thiserror::Error, Debug)]
pub enum ScsiError {
#[error("{0}")]
Error(#[from] Error),
#[error("{0}")]
Sense(#[from] SenseInfo),
}
impl From<std::io::Error> for ScsiError {
fn from(error: std::io::Error) -> Self {
Self::Error(error.into())
}
}
// Opaque wrapper for sg_pt_base
#[repr(C)]
struct SgPtBase {
_private: [u8; 0],
}
#[repr(transparent)]
struct SgPt {
raw: NonNull<SgPtBase>,
}
impl Drop for SgPt {
fn drop(&mut self) {
unsafe { destruct_scsi_pt_obj(self.as_mut_ptr()) };
}
}
impl SgPt {
fn new() -> Result<Self, Error> {
Ok(Self {
raw: NonNull::new(unsafe { construct_scsi_pt_obj() })
.ok_or_else(|| format_err!("construct_scsi_pt_ob failed"))?,
})
}
fn as_ptr(&self) -> *const SgPtBase {
self.raw.as_ptr()
}
fn as_mut_ptr(&mut self) -> *mut SgPtBase {
self.raw.as_ptr()
}
}
/// Peripheral device type text (see `inquiry` command)
///
/// see <https://en.wikipedia.org/wiki/SCSI_Peripheral_Device_Type>
pub const PERIPHERAL_DEVICE_TYPE_TEXT: [&str; 32] = [
"Disk Drive",
"Tape Drive",
"Printer",
"Processor",
"Write-once",
"CD-ROM", // 05h
"Scanner",
"Optical",
"Medium Changer", // 08h
"Communications",
"ASC IT8",
"ASC IT8",
"RAID Array",
"Enclosure Services",
"Simplified direct-access",
"Optical card reader/writer",
"Bridging Expander",
"Object-based Storage",
"Automation/Drive Interface",
"Security manager",
"Reserved",
"Reserved",
"Reserved",
"Reserved",
"Reserved",
"Reserved",
"Reserved",
"Reserved",
"Reserved",
"Reserved",
"Reserved",
"Unknown",
];
// SENSE KEYS
pub const SENSE_KEY_NO_SENSE: u8 = 0x00;
pub const SENSE_KEY_RECOVERED_ERROR: u8 = 0x01;
pub const SENSE_KEY_NOT_READY: u8 = 0x02;
pub const SENSE_KEY_MEDIUM_ERROR: u8 = 0x03;
pub const SENSE_KEY_HARDWARE_ERROR: u8 = 0x04;
pub const SENSE_KEY_ILLEGAL_REQUEST: u8 = 0x05;
pub const SENSE_KEY_UNIT_ATTENTION: u8 = 0x06;
pub const SENSE_KEY_DATA_PROTECT: u8 = 0x07;
pub const SENSE_KEY_BLANK_CHECK: u8 = 0x08;
pub const SENSE_KEY_COPY_ABORTED: u8 = 0x0a;
pub const SENSE_KEY_ABORTED_COMMAND: u8 = 0x0b;
pub const SENSE_KEY_VOLUME_OVERFLOW: u8 = 0x0d;
pub const SENSE_KEY_MISCOMPARE: u8 = 0x0e;
// SAM STAT
const SAM_STAT_CHECK_CONDITION: i32 = 0x02;
/// Sense Key Descriptions
pub const SENSE_KEY_DESCRIPTIONS: [&str; 16] = [
"No Sense",
"Recovered Error",
"Not Ready",
"Medium Error",
"Hardware Error",
"Illegal Request",
"Unit Attention",
"Data Protect",
"Blank Check",
"Vendor specific",
"Copy Aborted",
"Aborted Command",
"Equal",
"Volume Overflow",
"Miscompare",
"Completed",
];
#[repr(C, packed)]
#[derive(Endian)]
// Standard Inquiry page - 36 bytes
struct InquiryPage {
peripheral_type: u8,
rmb: u8,
version: u8,
flags3: u8,
additional_length: u8,
flags5: u8,
flags6: u8,
flags7: u8,
vendor: [u8; 8],
product: [u8; 16],
revision: [u8; 4],
}
#[repr(C, packed)]
#[derive(Endian, Debug)]
pub struct RequestSenseFixed {
pub response_code: u8,
obsolete: u8,
pub flags2: u8,
pub information: [u8; 4],
pub additional_sense_len: u8,
pub command_specific_information: [u8; 4],
pub additional_sense_code: u8,
pub additional_sense_code_qualifier: u8,
pub field_replacable_unit_code: u8,
pub sense_key_specific: [u8; 3],
}
#[repr(C, packed)]
#[derive(Endian, Debug)]
struct RequestSenseDescriptor {
response_code: u8,
sense_key: u8,
additional_sense_code: u8,
additional_sense_code_qualifier: u8,
reserved: [u8; 4],
additional_sense_len: u8,
}
/// Inquiry result
#[derive(Serialize, Deserialize, Debug)]
pub struct InquiryInfo {
/// Peripheral device type (0-31)
pub peripheral_type: u8,
/// Peripheral device type as string
pub peripheral_type_text: String,
/// Vendor
pub vendor: String,
/// Product
pub product: String,
/// Revision
pub revision: String,
}
#[repr(C, packed)]
#[derive(Endian, Debug, Copy, Clone)]
pub struct ModeParameterHeader {
pub mode_data_len: u16,
// Note: medium_type and density_code are not the same. On HP
// drives, medium_type provides very limited information and is
// not compatible with IBM.
pub medium_type: u8,
pub flags3: u8,
reserved4: [u8; 2],
pub block_descriptior_len: u16,
}
impl ModeParameterHeader {
pub fn buffer_mode(&self) -> u8 {
(self.flags3 & 0b0111_0000) >> 4
}
pub fn set_buffer_mode(&mut self, buffer_mode: bool) {
let mut mode = self.flags3 & 0b1_000_1111;
if buffer_mode {
mode |= 0b0_001_0000;
}
self.flags3 = mode;
}
pub fn write_protect(&self) -> bool {
(self.flags3 & 0b1000_0000) != 0
}
}
#[repr(C, packed)]
#[derive(Endian, Debug, Copy, Clone)]
/// SCSI ModeBlockDescriptor for Tape devices
pub struct ModeBlockDescriptor {
pub density_code: u8,
pub number_of_blocks: [u8; 3],
reserverd: u8,
pub block_length: [u8; 3],
}
impl ModeBlockDescriptor {
pub fn block_length(&self) -> u32 {
((self.block_length[0] as u32) << 16)
+ ((self.block_length[1] as u32) << 8)
+ (self.block_length[2] as u32)
}
pub fn set_block_length(&mut self, length: u32) -> Result<(), Error> {
if length > 0x80_00_00 {
bail!("block length '{}' is too large", length);
}
self.block_length[0] = ((length & 0x00ff0000) >> 16) as u8;
self.block_length[1] = ((length & 0x0000ff00) >> 8) as u8;
self.block_length[2] = (length & 0x000000ff) as u8;
Ok(())
}
}
pub const SCSI_PT_DO_START_OK: c_int = 0;
pub const SCSI_PT_DO_BAD_PARAMS: c_int = 1;
pub const SCSI_PT_DO_TIMEOUT: c_int = 2;
pub const SCSI_PT_RESULT_GOOD: c_int = 0;
pub const SCSI_PT_RESULT_STATUS: c_int = 1;
pub const SCSI_PT_RESULT_SENSE: c_int = 2;
pub const SCSI_PT_RESULT_TRANSPORT_ERR: c_int = 3;
pub const SCSI_PT_RESULT_OS_ERR: c_int = 4;
#[link(name = "sgutils2")]
extern "C" {
#[allow(dead_code)]
fn scsi_pt_open_device(device_name: *const c_char, read_only: bool, verbose: c_int) -> c_int;
fn sg_is_scsi_cdb(cdbp: *const u8, clen: c_int) -> bool;
fn construct_scsi_pt_obj() -> *mut SgPtBase;
fn destruct_scsi_pt_obj(objp: *mut SgPtBase);
fn set_scsi_pt_data_in(objp: *mut SgPtBase, dxferp: *mut u8, dxfer_ilen: c_int);
fn set_scsi_pt_data_out(objp: *mut SgPtBase, dxferp: *const u8, dxfer_olen: c_int);
fn set_scsi_pt_cdb(objp: *mut SgPtBase, cdb: *const u8, cdb_len: c_int);
fn set_scsi_pt_sense(objp: *mut SgPtBase, sense: *mut u8, max_sense_len: c_int);
fn do_scsi_pt(objp: *mut SgPtBase, fd: c_int, timeout_secs: c_int, verbose: c_int) -> c_int;
fn get_scsi_pt_resid(objp: *const SgPtBase) -> c_int;
fn get_scsi_pt_sense_len(objp: *const SgPtBase) -> c_int;
fn get_scsi_pt_status_response(objp: *const SgPtBase) -> c_int;
fn get_scsi_pt_result_category(objp: *const SgPtBase) -> c_int;
fn get_scsi_pt_os_err(objp: *const SgPtBase) -> c_int;
fn sg_get_asc_ascq_str(
asc: c_int,
ascq: c_int,
buff_len: c_int,
buffer: *mut c_char,
) -> *const c_char;
}
/// Safe interface to run RAW SCSI commands
pub struct SgRaw<'a, F> {
file: &'a mut F,
buffer: Box<[u8]>,
sense_buffer: [u8; 32],
timeout: i32,
}
/// Get the string associated with ASC/ASCQ values
pub fn get_asc_ascq_string(asc: u8, ascq: u8) -> String {
let mut buffer = [0u8; 1024];
let res = unsafe {
sg_get_asc_ascq_str(
asc as c_int,
ascq as c_int,
buffer.len() as c_int,
buffer.as_mut_ptr() as *mut c_char,
)
};
proxmox_lang::try_block!({
if res.is_null() {
// just to be safe
bail!("unexpected NULL ptr");
}
Ok(unsafe { CStr::from_ptr(res) }.to_str()?.to_owned())
})
.unwrap_or_else(|_err: Error| format!("ASC={:02x}x, ASCQ={:02x}x", asc, ascq))
}
/// Allocate a page aligned buffer
///
/// SG RAWIO commands needs page aligned transfer buffers.
pub fn alloc_page_aligned_buffer(buffer_size: usize) -> Result<Box<[u8]>, Error> {
let page_size = unsafe { libc::sysconf(libc::_SC_PAGESIZE) } as usize;
let layout = std::alloc::Layout::from_size_align(buffer_size, page_size)?;
let dinp = unsafe { std::alloc::alloc_zeroed(layout) };
if dinp.is_null() {
bail!("alloc SCSI output buffer failed");
}
let buffer_slice = unsafe { std::slice::from_raw_parts_mut(dinp, buffer_size) };
Ok(unsafe { Box::from_raw(buffer_slice) })
}
impl<'a, F: AsRawFd> SgRaw<'a, F> {
/// Create a new instance to run commands
///
/// The file must be a handle to a SCSI device.
pub fn new(file: &'a mut F, buffer_size: usize) -> Result<Self, Error> {
let buffer;
if buffer_size > 0 {
buffer = alloc_page_aligned_buffer(buffer_size)?;
} else {
buffer = Box::new([]);
}
let sense_buffer = [0u8; 32];
Ok(Self {
file,
buffer,
sense_buffer,
timeout: 0,
})
}
/// Set the command timeout in seconds (0 means default (60 seconds))
pub fn set_timeout(&mut self, seconds: usize) {
if seconds > (i32::MAX as usize) {
self.timeout = i32::MAX; // don't care about larger values
} else {
self.timeout = seconds as i32;
}
}
// create new object with initialized data_in and sense buffer
fn create_scsi_pt_obj(&mut self) -> Result<SgPt, Error> {
let mut ptvp = SgPt::new()?;
if !self.buffer.is_empty() {
unsafe {
set_scsi_pt_data_in(
ptvp.as_mut_ptr(),
self.buffer.as_mut_ptr(),
self.buffer.len() as c_int,
)
};
}
unsafe {
set_scsi_pt_sense(
ptvp.as_mut_ptr(),
self.sense_buffer.as_mut_ptr(),
self.sense_buffer.len() as c_int,
)
};
Ok(ptvp)
}
fn do_scsi_pt_checked(&mut self, ptvp: &mut SgPt) -> Result<(), ScsiError> {
let res = unsafe { do_scsi_pt(ptvp.as_mut_ptr(), self.file.as_raw_fd(), self.timeout, 0) };
match res {
SCSI_PT_DO_START_OK => { /* Ok */ }
SCSI_PT_DO_BAD_PARAMS => {
return Err(format_err!("do_scsi_pt failed - bad pass through setup").into())
}
SCSI_PT_DO_TIMEOUT => return Err(format_err!("do_scsi_pt failed - timeout").into()),
code if code < 0 => {
let errno = unsafe { get_scsi_pt_os_err(ptvp.as_ptr()) };
let err = nix::Error::from_errno(nix::errno::Errno::from_i32(errno));
return Err(format_err!("do_scsi_pt failed with err {}", err).into());
}
unknown => {
return Err(format_err!("do_scsi_pt failed: unknown error {}", unknown).into())
}
}
if res < 0 {
let err = nix::Error::last();
return Err(format_err!("do_scsi_pt failed - {}", err).into());
}
if res != 0 {
return Err(format_err!("do_scsi_pt failed {}", res).into());
}
let sense_len = unsafe { get_scsi_pt_sense_len(ptvp.as_ptr()) };
let mut res_cat = unsafe { get_scsi_pt_result_category(ptvp.as_ptr()) };
let status = unsafe { get_scsi_pt_status_response(ptvp.as_ptr()) };
if res_cat == SCSI_PT_RESULT_TRANSPORT_ERR && status == SAM_STAT_CHECK_CONDITION {
res_cat = SCSI_PT_RESULT_SENSE;
}
match res_cat {
SCSI_PT_RESULT_GOOD => Ok(()),
SCSI_PT_RESULT_STATUS => {
if status != 0 {
return Err(
format_err!("unknown scsi error - status response {}", status).into(),
);
}
Ok(())
}
SCSI_PT_RESULT_SENSE => {
if sense_len == 0 {
return Err(format_err!("scsi command failed, but got no sense data").into());
}
let code = self.sense_buffer[0] & 0x7f;
let mut reader = &self.sense_buffer[..(sense_len as usize)];
let sense = match code {
0x70 => {
let sense: RequestSenseFixed = unsafe { reader.read_be_value()? };
SenseInfo {
sense_key: sense.flags2 & 0xf,
asc: sense.additional_sense_code,
ascq: sense.additional_sense_code_qualifier,
}
}
0x72 => {
let sense: RequestSenseDescriptor = unsafe { reader.read_be_value()? };
SenseInfo {
sense_key: sense.sense_key & 0xf,
asc: sense.additional_sense_code,
ascq: sense.additional_sense_code_qualifier,
}
}
0x71 | 0x73 => {
return Err(
format_err!("scsi command failed: received deferred Sense").into()
);
}
unknown => {
return Err(format_err!(
"scsi command failed: invalid Sense response code {:x}",
unknown
)
.into());
}
};
Err(ScsiError::Sense(sense))
}
SCSI_PT_RESULT_TRANSPORT_ERR => {
return Err(format_err!("scsi command failed: transport error").into())
}
SCSI_PT_RESULT_OS_ERR => {
let errno = unsafe { get_scsi_pt_os_err(ptvp.as_ptr()) };
let err = nix::Error::from_errno(nix::errno::Errno::from_i32(errno));
return Err(format_err!("scsi command failed with err {}", err).into());
}
unknown => {
return Err(
format_err!("scsi command failed: unknown result category {}", unknown).into(),
)
}
}
}
/// Run the specified RAW SCSI command
pub fn do_command(&mut self, cmd: &[u8]) -> Result<&[u8], ScsiError> {
if !unsafe { sg_is_scsi_cdb(cmd.as_ptr(), cmd.len() as c_int) } {
return Err(format_err!("no valid SCSI command").into());
}
if self.buffer.len() < 16 {
return Err(format_err!("input buffer too small").into());
}
let mut ptvp = self.create_scsi_pt_obj()?;
unsafe { set_scsi_pt_cdb(ptvp.as_mut_ptr(), cmd.as_ptr(), cmd.len() as c_int) };
self.do_scsi_pt_checked(&mut ptvp)?;
let resid = unsafe { get_scsi_pt_resid(ptvp.as_ptr()) } as usize;
if resid > self.buffer.len() {
return Err(
format_err!("do_scsi_pt failed - got strange resid (value too big)").into(),
);
}
let data_len = self.buffer.len() - resid;
Ok(&self.buffer[..data_len])
}
/// Run the specified RAW SCSI command, use data as input buffer
pub fn do_in_command<'b>(
&mut self,
cmd: &[u8],
data: &'b mut [u8],
) -> Result<&'b [u8], ScsiError> {
if !unsafe { sg_is_scsi_cdb(cmd.as_ptr(), cmd.len() as c_int) } {
return Err(format_err!("no valid SCSI command").into());
}
if data.is_empty() {
return Err(format_err!("got zero-sized input buffer").into());
}
let mut ptvp = self.create_scsi_pt_obj()?;
unsafe {
set_scsi_pt_data_in(ptvp.as_mut_ptr(), data.as_mut_ptr(), data.len() as c_int);
set_scsi_pt_cdb(ptvp.as_mut_ptr(), cmd.as_ptr(), cmd.len() as c_int);
};
self.do_scsi_pt_checked(&mut ptvp)?;
let resid = unsafe { get_scsi_pt_resid(ptvp.as_ptr()) } as usize;
if resid > data.len() {
return Err(
format_err!("do_scsi_pt failed - got strange resid (value too big)").into(),
);
}
let data_len = data.len() - resid;
Ok(&data[..data_len])
}
/// Run dataout command
///
/// Note: use alloc_page_aligned_buffer to alloc data transfer buffer
pub fn do_out_command(&mut self, cmd: &[u8], data: &[u8]) -> Result<(), ScsiError> {
if !unsafe { sg_is_scsi_cdb(cmd.as_ptr(), cmd.len() as c_int) } {
return Err(format_err!("no valid SCSI command").into());
}
let page_size = unsafe { libc::sysconf(libc::_SC_PAGESIZE) } as usize;
if ((data.as_ptr() as usize) & (page_size - 1)) != 0 {
return Err(format_err!("wrong transfer buffer alignment").into());
}
let mut ptvp = self.create_scsi_pt_obj()?;
unsafe {
set_scsi_pt_data_out(ptvp.as_mut_ptr(), data.as_ptr(), data.len() as c_int);
set_scsi_pt_cdb(ptvp.as_mut_ptr(), cmd.as_ptr(), cmd.len() as c_int);
};
self.do_scsi_pt_checked(&mut ptvp)?;
Ok(())
}
}
// Useful helpers
/// Converts SCSI ASCII text into String, trim zero and spaces
pub fn scsi_ascii_to_string(data: &[u8]) -> String {
String::from_utf8_lossy(data)
.trim_matches(char::from(0))
.trim()
.to_string()
}
/// Read SCSI Inquiry page
///
/// Returns Product/Vendor/Revision and device type.
pub fn scsi_inquiry<F: AsRawFd>(file: &mut F) -> Result<InquiryInfo, Error> {
let allocation_len: u8 = std::mem::size_of::<InquiryPage>() as u8;
let mut sg_raw = SgRaw::new(file, allocation_len as usize)?;
sg_raw.set_timeout(30); // use short timeout
let mut cmd = Vec::new();
cmd.extend(&[0x12, 0, 0, 0, allocation_len, 0]); // INQUIRY
let data = sg_raw
.do_command(&cmd)
.map_err(|err| format_err!("SCSI inquiry failed - {}", err))?;
proxmox_lang::try_block!({
let mut reader = data;
let page: InquiryPage = unsafe { reader.read_be_value()? };
let peripheral_type = page.peripheral_type & 31;
let info = InquiryInfo {
peripheral_type,
peripheral_type_text: PERIPHERAL_DEVICE_TYPE_TEXT[peripheral_type as usize].to_string(),
vendor: scsi_ascii_to_string(&page.vendor),
product: scsi_ascii_to_string(&page.product),
revision: scsi_ascii_to_string(&page.revision),
};
Ok(info)
})
.map_err(|err: Error| format_err!("decode inquiry page failed - {}", err))
}
/// Run SCSI Mode Sense
///
/// Warning: P needs to be repr(C, packed)]
pub fn scsi_mode_sense<F: AsRawFd, P: Endian>(
file: &mut F,
disable_block_descriptor: bool,
page_code: u8,
sub_page_code: u8,
) -> Result<(ModeParameterHeader, Option<ModeBlockDescriptor>, P), Error> {
let allocation_len: u16 = 4096;
let mut sg_raw = SgRaw::new(file, allocation_len as usize)?;
let mut cmd = Vec::new();
cmd.push(0x5A); // MODE SENSE(10)
if disable_block_descriptor {
cmd.push(8); // DBD=1 (Disable Block Descriptors)
} else {
cmd.push(0); // DBD=0 (Include Block Descriptors)
}
cmd.push(page_code & 63); // report current values for page_code
cmd.push(sub_page_code);
cmd.extend(&[0, 0, 0]); // reserved
cmd.extend(&allocation_len.to_be_bytes()); // allocation len
cmd.push(0); //control
let data = sg_raw
.do_command(&cmd)
.map_err(|err| format_err!("mode sense failed - {}", err))?;
proxmox_lang::try_block!({
let mut reader = data;
let head: ModeParameterHeader = unsafe { reader.read_be_value()? };
let expected_len = head.mode_data_len as usize + 2;
if data.len() < expected_len {
bail!(
"wrong mode_data_len: got {}, expected {}",
data.len(),
expected_len
);
} else if data.len() > expected_len {
// Note: Some hh7 drives returns the allocation_length
// instead of real data_len
let header_size = std::mem::size_of::<ModeParameterHeader>();
reader = &data[header_size..expected_len];
}
if disable_block_descriptor && head.block_descriptior_len != 0 {
let len = head.block_descriptior_len;
bail!("wrong block_descriptior_len: {}, expected 0", len);
}
let mut block_descriptor: Option<ModeBlockDescriptor> = None;
if !disable_block_descriptor {
if head.block_descriptior_len != 8 {
let len = head.block_descriptior_len;
bail!("wrong block_descriptior_len: {}, expected 8", len);
}
block_descriptor = Some(unsafe { reader.read_be_value()? });
}
let page: P = unsafe { reader.read_be_value()? };
Ok((head, block_descriptor, page))
})
.map_err(|err: Error| format_err!("decode mode sense failed - {}", err))
}
/// Resuqest Sense
pub fn scsi_request_sense<F: AsRawFd>(file: &mut F) -> Result<RequestSenseFixed, ScsiError> {
// request 252 bytes, as mentioned in the Seagate SCSI reference
let allocation_len: u8 = 252;
let mut sg_raw = SgRaw::new(file, allocation_len as usize)?;
sg_raw.set_timeout(30); // use short timeout
let mut cmd = Vec::new();
cmd.extend(&[0x03, 0, 0, 0, allocation_len, 0]); // REQUEST SENSE FIXED FORMAT
let data = sg_raw
.do_command(&cmd)
.map_err(|err| format_err!("request sense failed - {}", err))?;
let sense = proxmox_lang::try_block!({
let data_len = data.len();
if data_len < std::mem::size_of::<RequestSenseFixed>() {
bail!("got short data len ({})", data_len);
}
let code = data[0] & 0x7f;
if code != 0x70 {
bail!("received unexpected sense code '0x{:02x}'", code);
}
let mut reader = data;
let sense: RequestSenseFixed = unsafe { reader.read_be_value()? };
Ok(sense)
})
.map_err(|err: Error| format_err!("decode request sense failed - {}", err))?;
Ok(sense)
}
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