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rust-agent: Report errors to caller if possible

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Various recently added error-causing calls

This addresses the following warning:

    warning: unused `std::result::Result` that must be used
      --> rustjail/src/cgroups/fs/mod.rs:93:9
       |
    93 |         cg.add_task(CgroupPid::from(pid as u64));
       |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       |
       = note: `#[warn(unused_must_use)]` on by default
       = note: this `Result` may be an `Err` variant, which should be handled

    warning: unused `std::result::Result` that must be used
       --> rustjail/src/cgroups/fs/mod.rs:196:17
        |
    196 |                 freezer_controller.thaw();
        |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: this `Result` may be an `Err` variant, which should be handled

    warning: unused `std::result::Result` that must be used
       --> rustjail/src/cgroups/fs/mod.rs:199:17
        |
    199 |                 freezer_controller.freeze();
        |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: this `Result` may be an `Err` variant, which should be handled

    warning: unused `std::result::Result` that must be used
       --> rustjail/src/cgroups/fs/mod.rs:365:9
        |
    365 |         cpuset_controller.set_cpus(&cpu.cpus);
        |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: this `Result` may be an `Err` variant, which should be handled

    warning: unused `std::result::Result` that must be used
       --> rustjail/src/cgroups/fs/mod.rs:369:9
        |
    369 |         cpuset_controller.set_mems(&cpu.mems);
        |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: this `Result` may be an `Err` variant, which should be handled

    warning: unused `std::result::Result` that must be used
       --> rustjail/src/cgroups/fs/mod.rs:381:13
        |
    381 |             cpu_controller.set_shares(shares);
        |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: this `Result` may be an `Err` variant, which should be handled

    warning: unused `std::result::Result` that must be used
       --> rustjail/src/cgroups/fs/mod.rs:385:5
        |
    385 |     cpu_controller.set_cfs_quota_and_period(cpu.quota, cpu.period);
        |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: this `Result` may be an `Err` variant, which should be handled

    warning: unused `std::result::Result` that must be used
        --> rustjail/src/cgroups/fs/mod.rs:1061:13
         |
    1061 |             cpuset_controller.set_cpus(cpuset_cpus);
         |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         |
         = note: this `Result` may be an `Err` variant, which should be handled

The specific case of cpu_controller.set_cfs_quota_and_period is
addressed in a way that changes the logic following a suggestion by
Liu Bin, who had just added the code.

Fixes: #750

Suggested-by: Liu Bin <bin@hyper.sh>
Signed-off-by: Christophe de Dinechin <dinechin@redhat.com>
This commit is contained in:
Christophe de Dinechin 2020-09-24 13:45:58 +02:00
parent d5b492a1e7
commit ee739c5d59
1 changed files with 9 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
src/agent/rustjail/src/cgroups/fs/mod.rs
View File

@ -91,7 +91,7 @@ impl CgroupManager for Manager {
let h = cgroups::hierarchies::auto();
let h = Box::new(&*h);
let cg = load_or_create(h, &self.cpath);
cg.add_task(CgroupPid::from(pid as u64));
cg.add_task(CgroupPid::from(pid as u64))?;
Ok(())
}
@ -194,10 +194,10 @@ impl CgroupManager for Manager {
let freezer_controller: &FreezerController = cg.controller_of().unwrap();
match state {
FreezerState::Thawed => {
freezer_controller.thaw();
freezer_controller.thaw()?;
}
FreezerState::Frozen => {
freezer_controller.freeze();
freezer_controller.freeze()?;
}
_ => {
return Err(nix::Error::Sys(Errno::EINVAL).into());
@ -363,11 +363,11 @@ fn set_cpu_resources(cg: &cgroups::Cgroup, cpu: &LinuxCPU) -> Result<()> {
let cpuset_controller: &CpuSetController = cg.controller_of().unwrap();
if !cpu.cpus.is_empty() {
cpuset_controller.set_cpus(&cpu.cpus);
cpuset_controller.set_cpus(&cpu.cpus)?;
}
if !cpu.mems.is_empty() {
cpuset_controller.set_mems(&cpu.mems);
cpuset_controller.set_mems(&cpu.mems)?;
}
let cpu_controller: &CpuController = cg.controller_of().unwrap();
@ -379,11 +379,12 @@ fn set_cpu_resources(cg: &cgroups::Cgroup, cpu: &LinuxCPU) -> Result<()> {
shares
};
if shares != 0 {
cpu_controller.set_shares(shares);
cpu_controller.set_shares(shares)?;
}
}
cpu_controller.set_cfs_quota_and_period(cpu.quota, cpu.period);
set_resource!(cpu_controller, set_cfs_quota, cpu, quota);
set_resource!(cpu_controller, set_cfs_period, cpu, period);
set_resource!(cpu_controller, set_rt_runtime, cpu, realtime_runtime);
set_resource!(cpu_controller, set_rt_period_us, cpu, realtime_period);
@ -1059,7 +1060,7 @@ impl Manager {
info!(sl!(), "updating cpuset for path {:?}", &r_path);
let cg = load_or_create(h, &r_path);
let cpuset_controller: &CpuSetController = cg.controller_of().unwrap();
cpuset_controller.set_cpus(cpuset_cpus);
cpuset_controller.set_cpus(cpuset_cpus)?;
}
Ok(())