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tape: rename retry_command to execute_scsi_command, make retry a flag

This commit is contained in:
Dietmar Maurer 2021-01-27 09:34:24 +01:00
parent ec8d9c6b80
commit 16b4d78400
1 changed files with 13 additions and 4 deletions
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17
src/tape/changer/sg_pt_changer.rs
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@ -74,17 +74,19 @@ struct AddressAssignmentPage {
reserved23: u8,
}
/// Repeat command until sucessful, sleep 1 second between invovations
/// Execute scsi commands, optionally repeat the command until
/// successful (sleep 1 second between invovations)
///
/// Any Sense key other than NO_SENSE, RECOVERED_ERROR, NOT_READY and
/// UNIT_ATTENTION aborts the loop and returns an error. If the device
/// reports "Not Ready - becoming ready", we wait up to 5 minutes.
///
/// Skipped errors are printed on stderr.
fn retry_command<F: AsRawFd>(
fn execute_scsi_command<F: AsRawFd>(
sg_raw: &mut SgRaw<F>,
cmd: &[u8],
error_prefix: &str,
retry: bool,
) -> Result<Vec<u8>, Error> {
let start = std::time::SystemTime::now();
@ -97,6 +99,9 @@ fn retry_command<F: AsRawFd>(
match sg_raw.do_command(&cmd) {
Ok(data) => return Ok(data.to_vec()),
Err(err) => {
if !retry {
bail!("{} failed: {}", error_prefix, err);
}
if let Some(ref sense) = err.sense {
if sense.sense_key == SENSE_KEY_NO_SENSE ||
@ -151,7 +156,7 @@ fn read_element_address_assignment<F: AsRawFd>(
cmd.push(allocation_len); // allocation len
cmd.push(0); //control
let data = retry_command(&mut sg_raw, &cmd, "read element address assignment")?;
let data = execute_scsi_command(&mut sg_raw, &cmd, "read element address assignment", true)?;
proxmox::try_block!({
let mut reader = &data[..];
@ -315,13 +320,17 @@ pub fn read_element_status<F: AsRawFd>(file: &mut F) -> Result<MtxStatus, Error>
let mut import_export_slots = Vec::new();
let mut transports = Vec::new();
let mut retry = true;
loop {
let cmd = scsi_read_element_status_cdb(start_element_address, allocation_len);
let data = retry_command(&mut sg_raw, &cmd, "read element status (B8h)")?;
let data = execute_scsi_command(&mut sg_raw, &cmd, "read element status (B8h)", retry)?;
let page = decode_element_status_page(&inquiry, &data, start_element_address)?;
retry = false; // only retry the first command
transports.extend(page.transports);
drives.extend(page.drives);
storage_slots.extend(page.storage_slots);