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tape: make fsf/bsf driver specific

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Because the virtual tape driver behaves different than LTO drives.
This commit is contained in:
Dietmar Maurer 2021-04-06 11:09:21 +02:00
parent d26985a600
commit 8b2c6f5dbc
3 changed files with 89 additions and 67 deletions
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31
src/tape/drive/lto/mod.rs
View File

@ -179,6 +179,14 @@ impl LtoTapeHandle {
Ok(status)
}
pub fn forward_space_count_files(&mut self, count: usize) -> Result<(), Error> {
self.sg_tape.space_filemarks(isize::try_from(count)?)
}
pub fn backward_space_count_files(&mut self, count: usize) -> Result<(), Error> {
self.sg_tape.space_filemarks(-isize::try_from(count)?)
}
pub fn erase_media(&mut self, fast: bool) -> Result<(), Error> {
self.sg_tape.erase_media(fast)
}
@ -211,12 +219,25 @@ impl TapeDriver for LtoTapeHandle {
self.sg_tape.move_to_eom()
}
fn forward_space_count_files(&mut self, count: usize) -> Result<(), Error> {
self.sg_tape.space_filemarks(isize::try_from(count)?)
}
fn move_to_last_file(&mut self) -> Result<(), Error> {
fn backward_space_count_files(&mut self, count: usize) -> Result<(), Error> {
self.sg_tape.space_filemarks(-isize::try_from(count)?)
self.move_to_eom()?;
let pos = self.current_file_number()?;
if pos == 0 {
bail!("move_to_last_file failed - media contains no data");
}
if pos == 1 {
self.rewind()?;
return Ok(());
}
self.backward_space_count_files(2)?;
self.forward_space_count_files(1)?;
Ok(())
}
fn rewind(&mut self) -> Result<(), Error> {

19
src/tape/drive/mod.rs
View File

@ -88,24 +88,7 @@ pub trait TapeDriver {
fn move_to_eom(&mut self) -> Result<(), Error>;
/// Move to last file
fn move_to_last_file(&mut self) -> Result<(), Error> {
self.move_to_eom()?;
if self.current_file_number()? == 0 {
bail!("move_to_last_file failed - media contains no data");
}
self.backward_space_count_files(2)?;
Ok(())
}
/// Forward space count files. The tape is positioned on the first block of the next file.
fn forward_space_count_files(&mut self, count: usize) -> Result<(), Error>;
/// Backward space count files. The tape is positioned on the last block of the previous file.
fn backward_space_count_files(&mut self, count: usize) -> Result<(), Error>;
fn move_to_last_file(&mut self) -> Result<(), Error>;
/// Current file number
fn current_file_number(&mut self) -> Result<u64, Error>;

106
src/tape/drive/virtual_tape.rs
View File

@ -181,6 +181,53 @@ impl VirtualTapeHandle {
Ok(list)
}
#[allow(dead_code)]
fn forward_space_count_files(&mut self, count: usize) -> Result<(), Error> {
let mut status = self.load_status()?;
match status.current_tape {
Some(VirtualTapeStatus { ref name, ref mut pos }) => {
let index = self.load_tape_index(name)
.map_err(|err| io::Error::new(io::ErrorKind::Other, err.to_string()))?;
let new_pos = *pos + count;
if new_pos <= index.files {
*pos = new_pos;
} else {
bail!("forward_space_count_files failed: move beyond EOT");
}
self.store_status(&status)
.map_err(|err| io::Error::new(io::ErrorKind::Other, err.to_string()))?;
Ok(())
}
None => bail!("drive is empty (no tape loaded)."),
}
}
// Note: behavior differs from LTO, because we always position at
// EOT side.
fn backward_space_count_files(&mut self, count: usize) -> Result<(), Error> {
let mut status = self.load_status()?;
match status.current_tape {
Some(VirtualTapeStatus { ref mut pos, .. }) => {
if count <= *pos {
*pos = *pos - count;
} else {
bail!("backward_space_count_files failed: move before BOT");
}
self.store_status(&status)
.map_err(|err| io::Error::new(io::ErrorKind::Other, err.to_string()))?;
Ok(())
}
None => bail!("drive is empty (no tape loaded)."),
}
}
}
impl TapeDriver for VirtualTapeHandle {
@ -199,6 +246,21 @@ impl TapeDriver for VirtualTapeHandle {
}
}
/// Move to last file
fn move_to_last_file(&mut self) -> Result<(), Error> {
self.move_to_eom()?;
if self.current_file_number()? == 0 {
bail!("move_to_last_file failed - media contains no data");
}
self.backward_space_count_files(1)?;
Ok(())
}
fn read_next_file(&mut self) -> Result<Option<Box<dyn TapeRead>>, io::Error> {
let mut status = self.load_status()
.map_err(|err| io::Error::new(io::ErrorKind::Other, err.to_string()))?;
@ -304,50 +366,6 @@ impl TapeDriver for VirtualTapeHandle {
}
}
fn forward_space_count_files(&mut self, count: usize) -> Result<(), Error> {
let mut status = self.load_status()?;
match status.current_tape {
Some(VirtualTapeStatus { ref name, ref mut pos }) => {
let index = self.load_tape_index(name)
.map_err(|err| io::Error::new(io::ErrorKind::Other, err.to_string()))?;
let new_pos = *pos + count;
if new_pos <= index.files {
*pos = new_pos;
} else {
bail!("forward_space_count_files failed: move beyond EOT");
}
self.store_status(&status)
.map_err(|err| io::Error::new(io::ErrorKind::Other, err.to_string()))?;
Ok(())
}
None => bail!("drive is empty (no tape loaded)."),
}
}
fn backward_space_count_files(&mut self, count: usize) -> Result<(), Error> {
let mut status = self.load_status()?;
match status.current_tape {
Some(VirtualTapeStatus { ref mut pos, .. }) => {
if count <= *pos {
*pos = *pos - count;
} else {
bail!("backward_space_count_files failed: move before BOT");
}
self.store_status(&status)
.map_err(|err| io::Error::new(io::ErrorKind::Other, err.to_string()))?;
Ok(())
}
None => bail!("drive is empty (no tape loaded)."),
}
}
fn rewind(&mut self) -> Result<(), Error> {
let mut status = self.load_status()?;
match status.current_tape {