860 lines
25 KiB
Rust
860 lines
25 KiB
Rust
use std::time::SystemTime;
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use std::fs::{File, OpenOptions};
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use std::os::unix::fs::OpenOptionsExt;
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use std::os::unix::io::AsRawFd;
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use std::path::Path;
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use anyhow::{bail, format_err, Error};
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use endian_trait::Endian;
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use nix::fcntl::{fcntl, FcntlArg, OFlag};
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mod encryption;
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pub use encryption::*;
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mod volume_statistics;
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pub use volume_statistics::*;
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mod tape_alert_flags;
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pub use tape_alert_flags::*;
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mod mam;
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pub use mam::*;
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mod report_density;
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pub use report_density::*;
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use proxmox::{
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sys::error::SysResult,
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tools::io::{ReadExt, WriteExt},
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};
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use crate::{
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api2::types::{
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MamAttribute,
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Lp17VolumeStatistics,
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},
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tape::{
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BlockRead,
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BlockReadError,
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BlockWrite,
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file_formats::{
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BlockedWriter,
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BlockedReader,
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},
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},
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tools::sgutils2::{
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SgRaw,
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SenseInfo,
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ScsiError,
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InquiryInfo,
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ModeParameterHeader,
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ModeBlockDescriptor,
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alloc_page_aligned_buffer,
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scsi_inquiry,
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scsi_mode_sense,
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scsi_request_sense,
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},
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};
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#[repr(C, packed)]
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#[derive(Endian, Debug, Copy, Clone)]
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pub struct ReadPositionLongPage {
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flags: u8,
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reserved: [u8;3],
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partition_number: u32,
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pub logical_object_number: u64,
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pub logical_file_id: u64,
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obsolete: [u8;8],
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}
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#[repr(C, packed)]
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#[derive(Endian, Debug, Copy, Clone)]
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struct DataCompressionModePage {
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page_code: u8, // 0x0f
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page_length: u8, // 0x0e
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flags2: u8,
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flags3: u8,
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compression_algorithm: u32,
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decompression_algorithm: u32,
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reserved: [u8;4],
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}
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impl DataCompressionModePage {
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pub fn set_compression(&mut self, enable: bool) {
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if enable {
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self.flags2 |= 128;
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} else {
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self.flags2 = self.flags2 & 127;
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}
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}
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pub fn compression_enabled(&self) -> bool {
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(self.flags2 & 0b1000_0000) != 0
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}
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}
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#[repr(C, packed)]
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#[derive(Endian)]
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struct MediumConfigurationModePage {
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page_code: u8, // 0x1d
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page_length: u8, // 0x1e
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flags2: u8,
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reserved: [u8;29],
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}
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impl MediumConfigurationModePage {
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pub fn is_worm(&self) -> bool {
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(self.flags2 & 1) == 1
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}
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}
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#[derive(Debug)]
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pub struct LtoTapeStatus {
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pub block_length: u32,
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pub density_code: u8,
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pub buffer_mode: u8,
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pub write_protect: bool,
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pub compression: bool,
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}
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pub struct SgTape {
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file: File,
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info: InquiryInfo,
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encryption_key_loaded: bool,
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}
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impl SgTape {
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const SCSI_TAPE_DEFAULT_TIMEOUT: usize = 60*2; // 2 minutes
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/// Create a new instance
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///
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/// Uses scsi_inquiry to check the device type.
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pub fn new(mut file: File) -> Result<Self, Error> {
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let info = scsi_inquiry(&mut file)?;
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if info.peripheral_type != 1 {
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bail!("not a tape device (peripheral_type = {})", info.peripheral_type);
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}
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Ok(Self {
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file,
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info,
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encryption_key_loaded: false,
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})
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}
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/// Access to file descriptor - useful for testing
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pub fn file_mut(&mut self) -> &mut File {
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&mut self.file
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}
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pub fn info(&self) -> &InquiryInfo {
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&self.info
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}
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/// Return the maximum supported density code
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///
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/// This can be used to detect the drive generation.
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pub fn max_density_code(&mut self) -> Result<u8, Error> {
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report_density(&mut self.file)
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}
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pub fn open<P: AsRef<Path>>(path: P) -> Result<SgTape, Error> {
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// do not wait for media, use O_NONBLOCK
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let file = OpenOptions::new()
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.read(true)
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.write(true)
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.custom_flags(libc::O_NONBLOCK)
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.open(path)?;
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// then clear O_NONBLOCK
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let flags = fcntl(file.as_raw_fd(), FcntlArg::F_GETFL)
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.into_io_result()?;
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let mut flags = OFlag::from_bits_truncate(flags);
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flags.remove(OFlag::O_NONBLOCK);
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fcntl(file.as_raw_fd(), FcntlArg::F_SETFL(flags))
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.into_io_result()?;
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Self::new(file)
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}
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pub fn inquiry(&mut self) -> Result<InquiryInfo, Error> {
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scsi_inquiry(&mut self.file)
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}
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/// Erase medium.
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///
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/// EOD is written at the current position, which marks it as end
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/// of data. After the command is successfully completed, the
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/// drive is positioned immediately before End Of Data (not End Of
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/// Tape).
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pub fn erase_media(&mut self, fast: bool) -> Result<(), Error> {
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let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
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sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
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let mut cmd = Vec::new();
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cmd.push(0x19);
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if fast {
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cmd.push(0); // LONG=0
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} else {
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cmd.push(1); // LONG=1
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}
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cmd.extend(&[0, 0, 0, 0]);
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sg_raw.do_command(&cmd)
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.map_err(|err| format_err!("erase failed - {}", err))?;
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Ok(())
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}
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/// Format media, single partition
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pub fn format_media(&mut self, fast: bool) -> Result<(), Error> {
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// try to get info about loaded media first
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let (has_format, is_worm) = match self.read_medium_configuration_page() {
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Ok((_head, block_descriptor, page)) => {
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// FORMAT requires LTO5 or newer
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let has_format = block_descriptor.density_code >= 0x58;
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let is_worm = page.is_worm();
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(has_format, is_worm)
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}
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Err(_) => {
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// LTO3 and older do not supprt medium configuration mode page
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(false, false)
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}
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};
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if is_worm {
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// We cannot FORMAT WORM media! Instead we check if its empty.
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self.move_to_eom(false)?;
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let pos = self.position()?;
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if pos.logical_object_number != 0 {
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bail!("format failed - detected WORM media with data.");
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}
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Ok(())
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} else {
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self.rewind()?;
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let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
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sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
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let mut cmd = Vec::new();
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if has_format {
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cmd.extend(&[0x04, 0, 0, 0, 0, 0]); // FORMAT
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sg_raw.do_command(&cmd)?;
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if !fast {
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self.erase_media(false)?; // overwrite everything
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}
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} else {
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// try rewind/erase instead
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self.erase_media(fast)?
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}
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Ok(())
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}
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}
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/// Lock/Unlock drive door
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pub fn set_medium_removal(&mut self, allow: bool) -> Result<(), ScsiError> {
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let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
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sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
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let mut cmd = Vec::new();
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cmd.extend(&[0x1E, 0, 0, 0]);
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if allow {
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cmd.push(0);
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} else {
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cmd.push(1);
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}
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cmd.push(0); // control
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sg_raw.do_command(&cmd)?;
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Ok(())
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}
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pub fn rewind(&mut self) -> Result<(), Error> {
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let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
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sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
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let mut cmd = Vec::new();
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cmd.extend(&[0x01, 0, 0, 0, 0, 0]); // REWIND
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sg_raw.do_command(&cmd)
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.map_err(|err| format_err!("rewind failed - {}", err))?;
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Ok(())
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}
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pub fn locate_file(&mut self, position: u64) -> Result<(), Error> {
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if position == 0 {
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return self.rewind();
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}
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let position = position -1;
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let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
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sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
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let mut cmd = Vec::new();
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// Note: LOCATE(16) works for LTO4 or newer
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cmd.extend(&[0x92, 0b000_01_000, 0, 0]); // LOCATE(16) filemarks
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cmd.extend(&position.to_be_bytes());
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cmd.extend(&[0, 0, 0, 0]);
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sg_raw.do_command(&cmd)
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.map_err(|err| format_err!("locate file {} failed - {}", position, err))?;
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// move to other side of filemark
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cmd.truncate(0);
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cmd.extend(&[0x11, 0x01, 0, 0, 1, 0]); // SPACE(6) one filemarks
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sg_raw.do_command(&cmd)
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.map_err(|err| format_err!("locate file {} (space) failed - {}", position, err))?;
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Ok(())
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}
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pub fn position(&mut self) -> Result<ReadPositionLongPage, Error> {
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let expected_size = std::mem::size_of::<ReadPositionLongPage>();
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let mut sg_raw = SgRaw::new(&mut self.file, 32)?;
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sg_raw.set_timeout(30); // use short timeout
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let mut cmd = Vec::new();
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// READ POSITION LONG FORM works on LTO4 or newer (with recent
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// firmware), although it is missing in the IBM LTO4 SSCI
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// reference manual.
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cmd.extend(&[0x34, 0x06, 0, 0, 0, 0, 0, 0, 0, 0]); // READ POSITION LONG FORM
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let data = sg_raw.do_command(&cmd)
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.map_err(|err| format_err!("read position failed - {}", err))?;
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let page = proxmox::try_block!({
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if data.len() != expected_size {
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bail!("got unexpected data len ({} != {}", data.len(), expected_size);
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}
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let mut reader = &data[..];
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let page: ReadPositionLongPage = unsafe { reader.read_be_value()? };
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Ok(page)
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}).map_err(|err: Error| format_err!("decode position page failed - {}", err))?;
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if page.partition_number != 0 {
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bail!("detecthed partitioned tape - not supported");
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}
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Ok(page)
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}
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pub fn current_file_number(&mut self) -> Result<u64, Error> {
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let position = self.position()?;
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Ok(position.logical_file_id)
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}
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/// Check if we are positioned after a filemark (or BOT)
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pub fn check_filemark(&mut self) -> Result<bool, Error> {
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let pos = self.position()?;
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if pos.logical_object_number == 0 {
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// at BOT, Ok (no filemark required)
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return Ok(true);
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}
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// Note: SPACE blocks returns Err at filemark
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match self.space(-1, true) {
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Ok(_) => {
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self.space(1, true) // move back to end
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.map_err(|err| format_err!("check_filemark failed (space forward) - {}", err))?;
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Ok(false)
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}
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Err(ScsiError::Sense(SenseInfo { sense_key: 0, asc: 0, ascq: 1 })) => {
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// Filemark detected - good
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self.space(1, false) // move to EOT side of filemark
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.map_err(|err| format_err!("check_filemark failed (move to EOT side of filemark) - {}", err))?;
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Ok(true)
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}
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Err(err) => {
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bail!("check_filemark failed - {:?}", err);
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}
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}
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}
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pub fn move_to_eom(&mut self, write_missing_eof: bool) -> Result<(), Error> {
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let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
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sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
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let mut cmd = Vec::new();
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cmd.extend(&[0x11, 0x03, 0, 0, 0, 0]); // SPACE(6) move to EOD
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sg_raw.do_command(&cmd)
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.map_err(|err| format_err!("move to EOD failed - {}", err))?;
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if write_missing_eof {
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if !self.check_filemark()? {
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self.write_filemarks(1, false)?;
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}
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}
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Ok(())
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}
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fn space(&mut self, count: isize, blocks: bool) -> Result<(), ScsiError> {
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let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
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sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
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let mut cmd = Vec::new();
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// Use short command if possible (supported by all drives)
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if (count <= 0x7fffff) && (count > -0x7fffff) {
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cmd.push(0x11); // SPACE(6)
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if blocks {
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cmd.push(0); // blocks
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} else {
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cmd.push(1); // filemarks
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}
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cmd.push(((count >> 16) & 0xff) as u8);
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cmd.push(((count >> 8) & 0xff) as u8);
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cmd.push((count & 0xff) as u8);
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cmd.push(0); //control byte
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} else {
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cmd.push(0x91); // SPACE(16)
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if blocks {
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cmd.push(0); // blocks
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} else {
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cmd.push(1); // filemarks
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}
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cmd.extend(&[0, 0]); // reserved
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let count: i64 = count as i64;
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cmd.extend(&count.to_be_bytes());
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cmd.extend(&[0, 0, 0, 0]); // reserved
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}
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sg_raw.do_command(&cmd)?;
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Ok(())
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}
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pub fn space_filemarks(&mut self, count: isize) -> Result<(), Error> {
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self.space(count, false)
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.map_err(|err| format_err!("space filemarks failed - {}", err))
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}
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pub fn space_blocks(&mut self, count: isize) -> Result<(), Error> {
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self.space(count, true)
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.map_err(|err| format_err!("space blocks failed - {}", err))
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}
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pub fn eject(&mut self) -> Result<(), Error> {
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let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
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sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
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let mut cmd = Vec::new();
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cmd.extend(&[0x1B, 0, 0, 0, 0, 0]); // LODA/UNLOAD HOLD=0, LOAD=0
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sg_raw.do_command(&cmd)
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.map_err(|err| format_err!("eject failed - {}", err))?;
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Ok(())
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}
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pub fn load(&mut self) -> Result<(), Error> {
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let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
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sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
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let mut cmd = Vec::new();
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cmd.extend(&[0x1B, 0, 0, 0, 0b0000_0001, 0]); // LODA/UNLOAD HOLD=0, LOAD=1
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sg_raw.do_command(&cmd)
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.map_err(|err| format_err!("load media failed - {}", err))?;
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Ok(())
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}
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pub fn write_filemarks(
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&mut self,
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count: usize,
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immediate: bool,
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) -> Result<(), std::io::Error> {
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if count > 255 {
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proxmox::io_bail!("write_filemarks failed: got strange count '{}'", count);
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}
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let mut sg_raw = SgRaw::new(&mut self.file, 16)
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.map_err(|err| proxmox::io_format_err!("write_filemarks failed (alloc) - {}", err))?;
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sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
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let mut cmd = Vec::new();
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cmd.push(0x10);
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if immediate {
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cmd.push(1); // IMMED=1
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} else {
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cmd.push(0); // IMMED=0
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}
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cmd.extend(&[0, 0, count as u8]); // COUNT
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cmd.push(0); // control byte
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match sg_raw.do_command(&cmd) {
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Ok(_) => { /* OK */ }
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Err(ScsiError::Sense(SenseInfo { sense_key: 0, asc: 0, ascq: 2 })) => {
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/* LEOM - ignore */
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}
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Err(err) => {
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proxmox::io_bail!("write filemark failed - {}", err);
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}
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}
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Ok(())
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}
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// Flush tape buffers (WEOF with count 0 => flush)
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pub fn sync(&mut self) -> Result<(), std::io::Error> {
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self.write_filemarks(0, false)?;
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Ok(())
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}
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pub fn test_unit_ready(&mut self) -> Result<(), Error> {
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let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
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sg_raw.set_timeout(30); // use short timeout
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let mut cmd = Vec::new();
|
|
cmd.extend(&[0x00, 0, 0, 0, 0, 0]); // TEST UNIT READY
|
|
|
|
match sg_raw.do_command(&cmd) {
|
|
Ok(_) => Ok(()),
|
|
Err(err) => {
|
|
bail!("test_unit_ready failed - {}", err);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn wait_until_ready(&mut self) -> Result<(), Error> {
|
|
|
|
let start = SystemTime::now();
|
|
let max_wait = std::time::Duration::new(Self::SCSI_TAPE_DEFAULT_TIMEOUT as u64, 0);
|
|
|
|
loop {
|
|
match self.test_unit_ready() {
|
|
Ok(()) => return Ok(()),
|
|
_ => {
|
|
std::thread::sleep(std::time::Duration::new(1, 0));
|
|
if start.elapsed()? > max_wait {
|
|
bail!("wait_until_ready failed - got timeout");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Read Tape Alert Flags
|
|
pub fn tape_alert_flags(&mut self) -> Result<TapeAlertFlags, Error> {
|
|
read_tape_alert_flags(&mut self.file)
|
|
}
|
|
|
|
/// Read Cartridge Memory (MAM Attributes)
|
|
pub fn cartridge_memory(&mut self) -> Result<Vec<MamAttribute>, Error> {
|
|
read_mam_attributes(&mut self.file)
|
|
}
|
|
|
|
/// Read Volume Statistics
|
|
pub fn volume_statistics(&mut self) -> Result<Lp17VolumeStatistics, Error> {
|
|
return read_volume_statistics(&mut self.file);
|
|
}
|
|
|
|
pub fn set_encryption(
|
|
&mut self,
|
|
key: Option<[u8; 32]>,
|
|
) -> Result<(), Error> {
|
|
|
|
self.encryption_key_loaded = key.is_some();
|
|
|
|
set_encryption(&mut self.file, key)
|
|
}
|
|
|
|
// Note: use alloc_page_aligned_buffer to alloc data transfer buffer
|
|
//
|
|
// Returns true if the drive reached the Logical End Of Media (early warning)
|
|
fn write_block(&mut self, data: &[u8]) -> Result<bool, std::io::Error> {
|
|
|
|
let transfer_len = data.len();
|
|
|
|
if transfer_len > 0x800000 {
|
|
proxmox::io_bail!("write failed - data too large");
|
|
}
|
|
|
|
let mut sg_raw = SgRaw::new(&mut self.file, 0)
|
|
.unwrap(); // cannot fail with size 0
|
|
|
|
sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
|
|
let mut cmd = Vec::new();
|
|
cmd.push(0x0A); // WRITE
|
|
cmd.push(0x00); // VARIABLE SIZED BLOCKS
|
|
cmd.push(((transfer_len >> 16) & 0xff) as u8);
|
|
cmd.push(((transfer_len >> 8) & 0xff) as u8);
|
|
cmd.push((transfer_len & 0xff) as u8);
|
|
cmd.push(0); // control byte
|
|
|
|
//println!("WRITE {:?}", cmd);
|
|
//println!("WRITE {:?}", data);
|
|
|
|
match sg_raw.do_out_command(&cmd, data) {
|
|
Ok(()) => { return Ok(false) }
|
|
Err(ScsiError::Sense(SenseInfo { sense_key: 0, asc: 0, ascq: 2 })) => {
|
|
return Ok(true); // LEOM
|
|
}
|
|
Err(err) => {
|
|
proxmox::io_bail!("write failed - {}", err);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn read_block(&mut self, buffer: &mut [u8]) -> Result<usize, BlockReadError> {
|
|
let transfer_len = buffer.len();
|
|
|
|
if transfer_len > 0xFFFFFF {
|
|
return Err(BlockReadError::Error(
|
|
proxmox::io_format_err!("read failed - buffer too large")
|
|
));
|
|
}
|
|
|
|
let mut sg_raw = SgRaw::new(&mut self.file, 0)
|
|
.unwrap(); // cannot fail with size 0
|
|
|
|
sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
|
|
let mut cmd = Vec::new();
|
|
cmd.push(0x08); // READ
|
|
cmd.push(0x02); // VARIABLE SIZED BLOCKS, SILI=1
|
|
//cmd.push(0x00); // VARIABLE SIZED BLOCKS, SILI=0
|
|
cmd.push(((transfer_len >> 16) & 0xff) as u8);
|
|
cmd.push(((transfer_len >> 8) & 0xff) as u8);
|
|
cmd.push((transfer_len & 0xff) as u8);
|
|
cmd.push(0); // control byte
|
|
|
|
let data = match sg_raw.do_in_command(&cmd, buffer) {
|
|
Ok(data) => data,
|
|
Err(ScsiError::Sense(SenseInfo { sense_key: 0, asc: 0, ascq: 1 })) => {
|
|
return Err(BlockReadError::EndOfFile);
|
|
}
|
|
Err(ScsiError::Sense(SenseInfo { sense_key: 8, asc: 0, ascq: 5 })) => {
|
|
return Err(BlockReadError::EndOfStream);
|
|
}
|
|
Err(err) => {
|
|
return Err(BlockReadError::Error(
|
|
proxmox::io_format_err!("read failed - {}", err)
|
|
));
|
|
}
|
|
};
|
|
|
|
if data.len() != transfer_len {
|
|
return Err(BlockReadError::Error(
|
|
proxmox::io_format_err!("read failed - unexpected block len ({} != {})", data.len(), buffer.len())
|
|
));
|
|
}
|
|
|
|
Ok(transfer_len)
|
|
}
|
|
|
|
pub fn open_writer(&mut self) -> BlockedWriter<SgTapeWriter> {
|
|
let writer = SgTapeWriter::new(self);
|
|
BlockedWriter::new(writer)
|
|
}
|
|
|
|
pub fn open_reader(&mut self) -> Result<BlockedReader<SgTapeReader>, BlockReadError> {
|
|
let reader = SgTapeReader::new(self);
|
|
BlockedReader::open(reader)
|
|
}
|
|
|
|
/// Set important drive options
|
|
pub fn set_drive_options(
|
|
&mut self,
|
|
compression: Option<bool>,
|
|
block_length: Option<u32>,
|
|
buffer_mode: Option<bool>,
|
|
) -> Result<(), Error> {
|
|
|
|
// Note: Read/Modify/Write
|
|
|
|
let (mut head, mut block_descriptor, mut page) = self.read_compression_page()?;
|
|
|
|
let mut sg_raw = SgRaw::new(&mut self.file, 0)?;
|
|
sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
|
|
|
|
head.mode_data_len = 0; // need to b e zero
|
|
|
|
if let Some(compression) = compression {
|
|
page.set_compression(compression);
|
|
}
|
|
|
|
if let Some(block_length) = block_length {
|
|
block_descriptor.set_block_length(block_length)?;
|
|
}
|
|
|
|
if let Some(buffer_mode) = buffer_mode {
|
|
head.set_buffer_mode(buffer_mode);
|
|
}
|
|
|
|
let mut data = Vec::new();
|
|
unsafe {
|
|
data.write_be_value(head)?;
|
|
data.write_be_value(block_descriptor)?;
|
|
data.write_be_value(page)?;
|
|
}
|
|
|
|
let mut cmd = Vec::new();
|
|
cmd.push(0x55); // MODE SELECT(10)
|
|
cmd.push(0b0001_0000); // PF=1
|
|
cmd.extend(&[0,0,0,0,0]); //reserved
|
|
|
|
let param_list_len: u16 = data.len() as u16;
|
|
cmd.extend(¶m_list_len.to_be_bytes());
|
|
cmd.push(0); // control
|
|
|
|
let mut buffer = alloc_page_aligned_buffer(4096)?;
|
|
|
|
buffer[..data.len()].copy_from_slice(&data[..]);
|
|
|
|
sg_raw.do_out_command(&cmd, &buffer[..data.len()])
|
|
.map_err(|err| format_err!("set drive options failed - {}", err))?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn read_medium_configuration_page(
|
|
&mut self,
|
|
) -> Result<(ModeParameterHeader, ModeBlockDescriptor, MediumConfigurationModePage), Error> {
|
|
|
|
let (head, block_descriptor, page): (_,_, MediumConfigurationModePage)
|
|
= scsi_mode_sense(&mut self.file, false, 0x1d, 0)?;
|
|
|
|
proxmox::try_block!({
|
|
if (page.page_code & 0b0011_1111) != 0x1d {
|
|
bail!("wrong page code {}", page.page_code);
|
|
}
|
|
if page.page_length != 0x1e {
|
|
bail!("wrong page length {}", page.page_length);
|
|
}
|
|
|
|
let block_descriptor = match block_descriptor {
|
|
Some(block_descriptor) => block_descriptor,
|
|
None => bail!("missing block descriptor"),
|
|
};
|
|
|
|
Ok((head, block_descriptor, page))
|
|
}).map_err(|err| format_err!("read_medium_configuration failed - {}", err))
|
|
}
|
|
|
|
fn read_compression_page(
|
|
&mut self,
|
|
) -> Result<(ModeParameterHeader, ModeBlockDescriptor, DataCompressionModePage), Error> {
|
|
|
|
let (head, block_descriptor, page): (_,_, DataCompressionModePage)
|
|
= scsi_mode_sense(&mut self.file, false, 0x0f, 0)?;
|
|
|
|
proxmox::try_block!({
|
|
if (page.page_code & 0b0011_1111) != 0x0f {
|
|
bail!("wrong page code {}", page.page_code);
|
|
}
|
|
if page.page_length != 0x0e {
|
|
bail!("wrong page length {}", page.page_length);
|
|
}
|
|
|
|
let block_descriptor = match block_descriptor {
|
|
Some(block_descriptor) => block_descriptor,
|
|
None => bail!("missing block descriptor"),
|
|
};
|
|
|
|
Ok((head, block_descriptor, page))
|
|
}).map_err(|err| format_err!("read_compression_page failed: {}", err))
|
|
}
|
|
|
|
/// Read drive options/status
|
|
///
|
|
/// We read the drive compression page, including the
|
|
/// block_descriptor. This is all information we need for now.
|
|
pub fn read_drive_status(&mut self) -> Result<LtoTapeStatus, Error> {
|
|
|
|
// We do a Request Sense, but ignore the result.
|
|
// This clears deferred error or media changed events.
|
|
let _ = scsi_request_sense(&mut self.file);
|
|
|
|
let (head, block_descriptor, page) = self.read_compression_page()?;
|
|
|
|
Ok(LtoTapeStatus {
|
|
block_length: block_descriptor.block_length(),
|
|
write_protect: head.write_protect(),
|
|
buffer_mode: head.buffer_mode(),
|
|
compression: page.compression_enabled(),
|
|
density_code: block_descriptor.density_code,
|
|
})
|
|
}
|
|
}
|
|
|
|
impl Drop for SgTape {
|
|
fn drop(&mut self) {
|
|
// For security reasons, clear the encryption key
|
|
if self.encryption_key_loaded {
|
|
let _ = self.set_encryption(None);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
pub struct SgTapeReader<'a> {
|
|
sg_tape: &'a mut SgTape,
|
|
end_of_file: bool,
|
|
}
|
|
|
|
impl <'a> SgTapeReader<'a> {
|
|
|
|
pub fn new(sg_tape: &'a mut SgTape) -> Self {
|
|
Self { sg_tape, end_of_file: false, }
|
|
}
|
|
}
|
|
|
|
impl <'a> BlockRead for SgTapeReader<'a> {
|
|
|
|
fn read_block(&mut self, buffer: &mut [u8]) -> Result<usize, BlockReadError> {
|
|
if self.end_of_file {
|
|
return Err(BlockReadError::Error(proxmox::io_format_err!("detected read after EOF!")));
|
|
}
|
|
match self.sg_tape.read_block(buffer) {
|
|
Ok(usize) => Ok(usize),
|
|
Err(BlockReadError::EndOfFile) => {
|
|
self.end_of_file = true;
|
|
Err(BlockReadError::EndOfFile)
|
|
},
|
|
Err(err) => Err(err),
|
|
}
|
|
}
|
|
}
|
|
|
|
pub struct SgTapeWriter<'a> {
|
|
sg_tape: &'a mut SgTape,
|
|
_leom_sent: bool,
|
|
}
|
|
|
|
impl <'a> SgTapeWriter<'a> {
|
|
|
|
pub fn new(sg_tape: &'a mut SgTape) -> Self {
|
|
Self { sg_tape, _leom_sent: false }
|
|
}
|
|
}
|
|
|
|
impl <'a> BlockWrite for SgTapeWriter<'a> {
|
|
|
|
fn write_block(&mut self, buffer: &[u8]) -> Result<bool, std::io::Error> {
|
|
self.sg_tape.write_block(buffer)
|
|
}
|
|
|
|
fn write_filemark(&mut self) -> Result<(), std::io::Error> {
|
|
self.sg_tape.write_filemarks(1, true)
|
|
}
|
|
}
|