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agent: Simplify do_add_swap()

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do_add_swap() has some mildly complex code to translate the PCI path of
a virtio-blk device (where the swap will reside) into a /dev path. However,
the device module already has get_virtio_blk_pci_device_name() which does
exactly that.  The existing code has some further advantages: it uses
more precise matching of the sysfs paths, and if necessary it will wait for
the device to be added to the guest.

While we're there, remove an unnecessary 'as u8' from the PCI path
construction: pci::Path::new() already accepts anything which implements
TryInfo<u8>, which u32 certainly does.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson 2021-09-24 15:36:40 +10:00
parent aad1a8734f
commit 75f426dd1e
1 changed files with 10 additions and 36 deletions
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46
src/agent/src/rpc.rs
View File

@ -3,7 +3,6 @@
// SPDX-License-Identifier: Apache-2.0
//
use crate::pci;
use async_trait::async_trait;
use rustjail::{pipestream::PipeStream, process::StreamType};
use tokio::io::{AsyncReadExt, AsyncWriteExt, ReadHalf};
@ -44,12 +43,15 @@ use nix::sys::stat;
use nix::unistd::{self, Pid};
use rustjail::process::ProcessOperations;
use crate::device::{add_devices, pcipath_to_sysfs, rescan_pci_bus, update_device_cgroup};
use crate::device::{
add_devices, get_virtio_blk_pci_device_name, rescan_pci_bus, update_device_cgroup,
};
use crate::linux_abi::*;
use crate::metrics::get_metrics;
use crate::mount::{add_storages, baremount, remove_mounts, STORAGE_HANDLER_LIST};
use crate::namespace::{NSTYPEIPC, NSTYPEPID, NSTYPEUTS};
use crate::network::setup_guest_dns;
use crate::pci;
use crate::random;
use crate::sandbox::Sandbox;
use crate::version::{AGENT_VERSION, API_VERSION};
@ -1204,7 +1206,9 @@ impl protocols::agent_ttrpc::AgentService for AgentService {
) -> ttrpc::Result<Empty> {
trace_rpc_call!(ctx, "add_swap", req);
do_add_swap(&req).map_err(|e| ttrpc_error(ttrpc::Code::INTERNAL, e.to_string()))?;
do_add_swap(&self.sandbox, &req)
.await
.map_err(|e| ttrpc_error(ttrpc::Code::INTERNAL, e.to_string()))?;
Ok(Empty::new())
}
@ -1557,43 +1561,13 @@ fn do_copy_file(req: &CopyFileRequest) -> Result<()> {
Ok(())
}
pub fn path_name_lookup<P: std::clone::Clone + AsRef<Path> + std::fmt::Debug>(
path: P,
lookup: &str,
) -> Result<(PathBuf, String)> {
for entry in fs::read_dir(path.clone())? {
let entry = entry?;
if let Some(name) = entry.path().file_name() {
if let Some(name) = name.to_str() {
if Some(0) == name.find(lookup) {
return Ok((entry.path(), name.to_string()));
}
}
}
}
Err(anyhow!("cannot get {} dir in {:?}", lookup, path))
}
fn do_add_swap(req: &AddSwapRequest) -> Result<()> {
// re-scan PCI bus
// looking for hidden devices
rescan_pci_bus().context("Could not rescan PCI bus")?;
async fn do_add_swap(sandbox: &Arc<Mutex<Sandbox>>, req: &AddSwapRequest) -> Result<()> {
let mut slots = Vec::new();
for slot in &req.PCIPath {
slots.push(pci::Slot::new(*slot as u8)?);
slots.push(pci::Slot::new(*slot)?);
}
let pcipath = pci::Path::new(slots)?;
let root_bus_sysfs = format!("{}{}", SYSFS_DIR, create_pci_root_bus_path());
let sysfs_rel_path = format!(
"{}{}",
root_bus_sysfs,
pcipath_to_sysfs(&root_bus_sysfs, &pcipath)?
);
let (mut virtio_path, _) = path_name_lookup(sysfs_rel_path, "virtio")?;
virtio_path.push("block");
let (_, dev_name) = path_name_lookup(virtio_path, "vd")?;
let dev_name = format!("/dev/{}", dev_name);
let dev_name = get_virtio_blk_pci_device_name(sandbox, &pcipath).await?;
let c_str = CString::new(dev_name)?;
let ret = unsafe { libc::swapon(c_str.as_ptr() as *const c_char, 0) };