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lto/sg_tape/encryption: remove non lto-4 supported byte 

from the SspDataEncryptionCapabilityPage

it seems we do not need it, since the EXTDECC flag is only used for
determining if the drive is capable to be configured via
ADI (Automation/Drive Interface) which we do not use at all.

this makes the call work with LTO-4 again

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak 2021-05-31 10:29:31 +02:00 committed by Dietmar Maurer
parent e21a15ab17
commit 84737fb33f
1 changed files with 2 additions and 13 deletions
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15
src/tape/drive/lto/sg_tape/encryption.rs
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@ -195,8 +195,7 @@ struct DataEncryptionStatus {
struct SspDataEncryptionCapabilityPage { struct SspDataEncryptionCapabilityPage {
page_code: u16, page_code: u16,
page_len: u16, page_len: u16,
extdecc_cfgp_byte: u8, reserved: [u8; 16],
reserved: [u8; 15],
} }
#[derive(Endian)] #[derive(Endian)]
@ -222,17 +221,7 @@ fn decode_spin_data_encryption_caps(data: &[u8]) -> Result<u8, Error> {
proxmox::try_block!({ proxmox::try_block!({
let mut reader = &data[..]; let mut reader = &data[..];
let page: SspDataEncryptionCapabilityPage = unsafe { reader.read_be_value()? }; let _page: SspDataEncryptionCapabilityPage = unsafe { reader.read_be_value()? };
let extdecc = (page.extdecc_cfgp_byte & 0b00001100) >> 2;
if extdecc != 2 {
bail!("not external data encryption control capable");
}
let cfg_p = page.extdecc_cfgp_byte & 0b00000011;
if cfg_p != 1 {
bail!("not allow to change logical block encryption parameters");
}
let mut aes_cgm_index = None; let mut aes_cgm_index = None;