From c9fdd142a4d58a97439686b4258912a66a39d4f3 Mon Sep 17 00:00:00 2001
From: Dietmar Maurer <dietmar@proxmox.com>
Date: Sat, 2 Jan 2021 13:38:57 +0100
Subject: [PATCH] tape: commit missing file

---
 src/tape/drive/tape_alert_flags.rs | 137 +++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 src/tape/drive/tape_alert_flags.rs

diff --git a/src/tape/drive/tape_alert_flags.rs b/src/tape/drive/tape_alert_flags.rs
new file mode 100644
index 00000000..5a65c783
--- /dev/null
+++ b/src/tape/drive/tape_alert_flags.rs
@@ -0,0 +1,137 @@
+use std::io::Read;
+use std::os::unix::io::AsRawFd;
+
+use anyhow::{bail, format_err, Error};
+
+use proxmox::tools::io::ReadExt;
+
+use crate::{
+    tape::{
+        sgutils2::SgRaw,
+    },
+};
+
+bitflags::bitflags!{
+
+    /// Tape Alert Flags
+    ///
+    /// See LTO SCSI Reference LOG_SENSE - LP 2Eh: TapeAlerts
+    pub struct TapeAlertFlags: u64 {
+        const READ_WARNING = 0x0001;
+        const WRITE_WARNING = 0002;
+        const HARD_ERROR = 0x0003;
+        const MEDIA = 0x0004;
+        const READ_FAILURE = 0x0005;
+        const WRITE_FAILURE = 0x0006;
+        const MEDIA_LIFE = 0x0007;
+        const NOT_DATA_GRADE = 0x0008;
+        const WRITE_PROTECT = 0x0009;
+        const NO_REMOVAL = 0x000A;
+        const CLEANING_MEDIA = 0x000B;
+        const UNSUPPORTED_FORMAT = 0x000C;
+        const UNRECOVERABLE_SNAPPED_TAPE = 0x000E;
+        const MEMORY_CHIP_IN_CARTRIDGE_FAILURE = 0x000F;
+        const FORCED_EJECT = 0x0010;
+        const READ_ONLY_FORMAT = 0x0011;
+        const TAPE_DIRECTORY_CORRUPTED = 0x0012;
+        const NEARING_MEDIA_LIFE = 0x0013;
+        const CLEAN_NOW = 0x0014;
+        const CLEAN_PERIODIC = 0x0015;
+        const EXPIRED_CLEANING_MEDIA = 0x0016;
+        const INVALID_CLEANING_TAPE = 0x0017;
+        const HOST_CHANNEL_FAILURE = 0x0019;
+        const COOLING_FAN_FAILURE = 0x001A;
+        const POWER_SUPPLY_FAILURE = 0x001B;
+        const HARDWARE_A = 0x001E;
+        const HARDWARE_B = 0x001F;
+        const INTERFACE = 0x0020;
+        const EJECT_MEDIA = 0x0021;
+        const DOWNLOAD_FAULT = 0x0022;
+        const DRIVE_TEMPERATURE = 0x0024;
+        const DRIVE_VOLTAGE = 0x0025;
+        const PREDICTIVE_FAILURE = 0x0026;
+        const DIAGNOSTICS_REQUIRED = 0x0027;
+        const LOADER_STRAY_TAPE = 0x0029;
+        const LOADER_HARDWARE = 0x002A;
+        const LOADER_MAGAZINE = 0x002D;
+        const DIMINISHED_NATIVE_CAPACITY = 0x0031;
+        const LOST_STATISTICS = 0x0032;
+        const TAPE_DIRECTORY_INVALID_AT_UNLOAD = 0x0033;
+        const TAPE_SYSTEM_AREA_WRITE_FAILURE = 0x0034;
+        const TAPE_SYSTEM_AREA_READ_FAILURE = 0x0035;
+        const NO_START_OF_DATA = 0x0036;
+        const LOADING_FAILURE = 0x0037;
+        const UNRECOVERABLE_UNLOAD_FAILURE = 0x0038;
+        const AUTOMATION_INTERFACE_FAILURE = 0x0039;
+        const FIRMWARE_FAILURE = 0x003A;
+        const WORM_INTEGRITY_CHECK_FAILED = 0x003B;
+        const WORM_OVERWRITE_ATTEMPTED = 0x003C;
+        const ENCRYPTION_POLICY_VIOLATION = 0x003D;
+    }
+}
+
+/// Read Tape Alert Flags using raw SCSI command.
+pub fn read_tape_alert_flags<F: AsRawFd>(file: &mut F) ->  Result<TapeAlertFlags, Error> {
+
+    let data = sg_read_tape_alert_flags(file)?;
+
+    decode_tape_alert_flags(&data)
+}
+
+fn sg_read_tape_alert_flags<F: AsRawFd>(file: &mut F) -> Result<Vec<u8>, Error> {
+
+    let mut sg_raw = SgRaw::new(file, 512)?;
+
+    let mut cmd = Vec::new();
+    cmd.push(0x4D); // LOG SENSE
+    cmd.push(0);
+    cmd.push(0x2e); // Tape Alert Flag page
+    cmd.push(0);
+    cmd.push(0);
+    cmd.push(0);
+    cmd.push(0);
+    cmd.extend(&[2u8, 0u8]); // alloc len
+    cmd.push(0u8); // control byte
+
+    sg_raw.do_command(&cmd)
+        .map_err(|err| format_err!("read tape alert flags failed - {}", err))
+        .map(|v| v.to_vec())
+}
+
+fn decode_tape_alert_flags(data: &[u8]) -> Result<TapeAlertFlags, Error> {
+
+    proxmox::try_block!({
+        if !(data[0] == 0x2e && data[1] == 0) {
+            bail!("invalid response");
+        }
+
+        let mut reader = &data[2..];
+
+        let page_len: u16 = unsafe { reader.read_be_value()? };
+        if page_len != 0x140 {
+            bail!("invalid page length");
+        }
+
+        let mut value: u64 = 0;
+
+        for _ in 1..65 {
+            let id: u16 = unsafe { reader.read_be_value()? };
+            if id < 1 || id > 64 {
+                bail!("invalid parameter id '{}'", id);
+            }
+            let bit: u64 = 1 << (id as usize - 1);
+            let mut data = [0u8;3];
+            reader.read_exact(&mut data)?;
+            if data[1] != 1 {
+                bail!("invalid parameter length");
+            }
+            match data[2] {
+                0 => {},
+                1 => { value |= bit; }
+                _ => bail!("invalid flag value"),
+            }
+        }
+
+        Ok(TapeAlertFlags::from_bits_truncate(value))
+    }).map_err(|err| format_err!("decode tape alert flags failed - {}", err))
+}