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virtio-devices: Port devices over to new read_config_from_slice() helper

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Using this helper removes lots of duplicated code across the devices.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford
2020-07-16 10:34:51 +01:00
committed by Sebastien Boeuf
parent d262540857
commit 751a302050
10 changed files with 26 additions and 142 deletions
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15
virtio-devices/src/block.rs
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@@ -17,7 +17,6 @@ use crate::VirtioInterrupt;
use anyhow::anyhow;
use block_util::{build_disk_image_id, Request, RequestType, VirtioBlockConfig};
use libc::EFD_NONBLOCK;
use std::cmp;
use std::collections::HashMap;
use std::fs::File;
use std::io::{self, Read, Seek, SeekFrom, Write};
@@ -504,18 +503,8 @@ impl<T: 'static + DiskFile + Send> VirtioDevice for Block<T> {
self.acked_features |= v;
}
fn read_config(&self, offset: u64, mut data: &mut [u8]) {
let config_slice = self.config.as_slice();
let config_len = config_slice.len() as u64;
if offset >= config_len {
error!("Failed to read config space");
return;
}
if let Some(end) = offset.checked_add(data.len() as u64) {
// This write can't fail, offset and end are checked against config_len.
data.write_all(&config_slice[offset as usize..cmp::min(end, config_len) as usize])
.unwrap();
}
fn read_config(&self, offset: u64, data: &mut [u8]) {
self.read_config_from_slice(self.config.as_slice(), offset, data);
}
fn write_config(&mut self, offset: u64, data: &[u8]) {