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tape: library status: don't fail if the library does not support DVCID

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some libraries (e.g. Qualstar) don't support the DVCID bit in the READ
ELEMENT (B8) command (to return vendor/model of connected drives), so
make that part optional if it fails. We only ever use the serial number
in the `pmtx` tool, so there is not much downside to not having this.

This increases compatibility with such libraries

Reported in the forum:
https://forum.proxmox.com/threads/cant-query-tape-robot-status.131833/

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak 2023-08-09 11:12:55 +02:00 committed by Dietmar Maurer
parent c884061623
commit dc887e93be
1 changed files with 12 additions and 10 deletions
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6
pbs-tape/src/sg_pt_changer.rs
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@ -398,12 +398,13 @@ pub fn read_element_status<F: AsRawFd>(file: &mut F) -> Result<MtxStatus, Error>
// get the serial + vendor + model,
// some changer require this to be an extra scsi command
let page = get_element(
// some changers don't support this
if let Ok(page) = get_element(
&mut sg_raw,
ElementType::DataTransferWithDVCID,
allocation_len,
false,
)?;
) {
// should be in same order and same count, but be on the safe side.
// there should not be too many drives normally
for drive in drives.iter_mut() {
@ -415,6 +416,7 @@ pub fn read_element_status<F: AsRawFd>(file: &mut F) -> Result<MtxStatus, Error>
}
}
}
}
let page = get_element(
&mut sg_raw,