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tape: use loaded media_type in format_media (instead of drive_density)

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Required to format LTO4 media loaded in LTO5 drive).

Also contains some SCSI code cleanups.
This commit is contained in:
Dietmar Maurer
2021-04-23 07:27:30 +02:00
parent f2f43e1904
commit 33b8d7e5e8
2 changed files with 34 additions and 13 deletions
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26
src/tape/drive/lto/sg_tape.rs
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@ -106,7 +106,7 @@ pub struct LtoTapeStatus {
pub struct SgTape {
file: File,
info: InquiryInfo,
density_code: u8, // drive type
max_density_code: u8, // drive type
encryption_key_loaded: bool,
}
@ -125,12 +125,12 @@ impl SgTape {
bail!("not a tape device (peripheral_type = {})", info.peripheral_type);
}
let density_code = report_density(&mut file)?;
let max_density_code = report_density(&mut file)?;
Ok(Self {
file,
info,
density_code,
max_density_code,
encryption_key_loaded: false,
})
}
@ -144,6 +144,10 @@ impl SgTape {
&self.info
}
pub fn max_density_code(&self) -> u8 {
self.max_density_code
}
pub fn open<P: AsRef<Path>>(path: P) -> Result<SgTape, Error> {
// do not wait for media, use O_NONBLOCK
let file = OpenOptions::new()
@ -198,11 +202,14 @@ impl SgTape {
self.rewind()?;
// get info about loaded media first
let (head, _, _) = self.read_compression_page()?;
let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
let mut cmd = Vec::new();
if self.density_code >= 0x58 { // FORMAT requires LTO5 or newer)
if head.medium_type >= 0x58 { // FORMAT requires LTO5 or newer)
cmd.extend(&[0x04, 0, 0, 0, 0, 0]);
sg_raw.do_command(&cmd)?;
if !fast {
@ -210,7 +217,6 @@ impl SgTape {
}
} else {
// try rewind/erase instead
self.rewind()?;
self.erase_media(fast)?
}
@ -620,11 +626,7 @@ impl SgTape {
}
if let Some(buffer_mode) = buffer_mode {
let mut mode = head.flags3 & 0b1_000_1111;
if buffer_mode {
mode |= 0b0_001_0000;
}
head.flags3 = mode;
head.set_buffer_mode(buffer_mode);
}
let mut data = Vec::new();
@ -686,8 +688,8 @@ impl SgTape {
Ok(LtoTapeStatus {
block_length: block_descriptor.block_length(),
write_protect: (head.flags3 & 0b1000_0000) != 0,
buffer_mode: (head.flags3 & 0b0111_0000) >> 4,
write_protect: head.write_protect(),
buffer_mode: head.buffer_mode(),
compression: page.compression_enabled(),
density_code: block_descriptor.density_code,
})