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agent: Re-organize uevent processing

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Uevent::process() is a bit oddly organized.  It treats the onlining of
hotplugged memory as the "default" case, although that's quite specific,
while treating the handling of hotplugged block devices more like a special
case, although that's pretty close to being very general.

Furthermore splitting Uevent::is_block_add_event() from
Uevent::handle_block_add_event() doesn't make a lot of sense, since their
logic is intimately related to each other.

Alter the code to be a bit more sensible: first split on the "action" type
since that's the most fundamental difference, then handle the memory
onlining special case, then the block device add (which will become a lot
more general in future changes).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson
2021-03-04 14:38:33 +11:00
parent 55ed2ddd07
commit d2caff6c55
1 changed files with 24 additions and 24 deletions
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48
src/agent/src/uevent.rs
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@@ -51,20 +51,34 @@ impl Uevent {
event
}
// Check whether this is a block device hot-add event.
fn is_block_add_event(&self) -> bool {
async fn process_add(&self, logger: &Logger, sandbox: &Arc<Mutex<Sandbox>>) {
// Special case for memory hot-adds first
let online_path = format!("{}/{}/online", SYSFS_DIR, &self.devpath);
if online_path.starts_with(SYSFS_MEMORY_ONLINE_PATH) {
let _ = online_device(online_path.as_ref()).map_err(|e| {
error!(
*logger,
"failed to online device";
"device" => &self.devpath,
"error" => format!("{}", e),
)
});
return;
}
let pci_root_bus_path = create_pci_root_bus_path();
self.action == U_EVENT_ACTION_ADD
&& self.subsystem == "block"
// Check whether this is a block device hot-add event.
if !(self.subsystem == "block"
&& {
self.devpath.starts_with(pci_root_bus_path.as_str())
|| self.devpath.starts_with(ACPI_DEV_PATH) // NVDIMM/PMEM devices
}
&& !self.devname.is_empty()
}
&& !self.devname.is_empty())
{
return;
}
async fn handle_block_add_event(&self, sandbox: &Arc<Mutex<Sandbox>>) {
let pci_root_bus_path = create_pci_root_bus_path();
let mut sb = sandbox.lock().await;
// Record the event by sysfs path
@@ -95,22 +109,8 @@ impl Uevent {
}
async fn process(&self, logger: &Logger, sandbox: &Arc<Mutex<Sandbox>>) {
if self.is_block_add_event() {
return self.handle_block_add_event(sandbox).await;
} else if self.action == U_EVENT_ACTION_ADD {
let online_path = format!("{}/{}/online", SYSFS_DIR, &self.devpath);
// It's a memory hot-add event.
if online_path.starts_with(SYSFS_MEMORY_ONLINE_PATH) {
let _ = online_device(online_path.as_ref()).map_err(|e| {
error!(
*logger,
"failed to online device";
"device" => &self.devpath,
"error" => format!("{}", e),
)
});
return;
}
if self.action == U_EVENT_ACTION_ADD {
return self.process_add(logger, sandbox).await;
}
debug!(*logger, "ignoring event"; "uevent" => format!("{:?}", self));
}