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virtio-devices: block: Refactor 'handle_event' for readability

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Signed-off-by: Bo Chen <chen.bo@intel.com>
This commit is contained in:
Bo Chen 2022-08-18 12:03:04 -07:00 committed by Sebastien Boeuf
parent 0b15e378c7
commit b4fe41ad0c
1 changed files with 49 additions and 53 deletions
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102
virtio-devices/src/block.rs
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@ -295,24 +295,21 @@ impl EpollHelperHandler for BlockEpollHandler {
// Process the queue only when the rate limit is not reached
if !rate_limit_reached {
match self.process_queue_submit() {
Ok(needs_notification) => {
if needs_notification {
if let Err(e) = self.signal_used_queue() {
return Err(EpollHelperError::HandleEvent(anyhow!(
"Failed to signal used queue: {:?}",
e
)));
}
}
}
Err(e) => {
return Err(EpollHelperError::HandleEvent(anyhow!(
"Failed to process queue (submit): {:?}",
let needs_notification = self.process_queue_submit().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to process queue (submit): {:?}",
e
))
})?;
if needs_notification {
self.signal_used_queue().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to signal used queue: {:?}",
e
)));
}
}
))
})?
};
}
}
COMPLETION_EVENT => {
@ -320,49 +317,48 @@ impl EpollHelperHandler for BlockEpollHandler {
EpollHelperError::HandleEvent(anyhow!("Failed to get queue event: {:?}", e))
})?;
match self.process_queue_complete() {
Ok(needs_notification) => {
if needs_notification {
if let Err(e) = self.signal_used_queue() {
return Err(EpollHelperError::HandleEvent(anyhow!(
"Failed to signal used queue: {:?}",
e
)));
}
}
}
Err(e) => {
return Err(EpollHelperError::HandleEvent(anyhow!(
"Failed to process queue (complete): {:?}",
let needs_notification = self.process_queue_complete().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to process queue (complete): {:?}",
e
))
})?;
if needs_notification {
self.signal_used_queue().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to signal used queue: {:?}",
e
)));
}
))
})?;
}
}
RATE_LIMITER_EVENT => {
if let Some(rate_limiter) = &mut self.rate_limiter {
// Upon rate limiter event, call the rate limiter handler
// and restart processing the queue.
if rate_limiter.event_handler().is_ok() {
match self.process_queue_submit() {
Ok(needs_notification) => {
if needs_notification {
if let Err(e) = self.signal_used_queue() {
return Err(EpollHelperError::HandleEvent(anyhow!(
"Failed to signal used queue: {:?}",
e
)));
}
}
}
Err(e) => {
return Err(EpollHelperError::HandleEvent(anyhow!(
"Failed to process queue (submit): {:?}",
e
)));
}
}
}
rate_limiter.event_handler().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to process rate limiter event: {:?}",
e
))
})?;
let needs_notification = self.process_queue_submit().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to process queue (submit): {:?}",
e
))
})?;
if needs_notification {
self.signal_used_queue().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to signal used queue: {:?}",
e
))
})?
};
} else {
return Err(EpollHelperError::HandleEvent(anyhow!(
"Unexpected 'RATE_LIMITER_EVENT' when rate_limiter is not enabled."