libublk: io: rename process_io as wait_ios

process_io() actually just waits for incoming io commands and target IO
from io_uring, so it is readable to name it as wait_ios().

Signed-off-by: Ming Lei <tom.leiming@gmail.com>

src/io.rs

@@ -723,7 +723,7 @@ impl UblkQueue<'_> {
     }
 
     #[inline(always)]
-    fn process_io(&mut self, to_wait: usize) -> Result<i32, UblkError> {
+    fn wait_ios(&mut self, to_wait: usize) -> Result<i32, UblkError> {
         info!(
             "dev{}-q{}: to_submit {} inflight cmd {} stopping {}",
             self.dev.dev_info.dev_id,
@@ -733,10 +733,6 @@ impl UblkQueue<'_> {
             (self.q_state & UBLK_QUEUE_STOPPING)
         );
 
-        if self.queue_is_done() && self.q_ring.submission().is_empty() {
-            return Err(UblkError::QueueIsDown(-libc::ENODEV));
-        }
-
         let ret = self
             .q_ring
             .submit_and_wait(to_wait)
@@ -807,7 +803,11 @@ impl UblkQueue<'_> {
     where
         F: FnMut(&mut UblkIOCtx) -> Result<UblkIORes, UblkError>,
     {
-        match self.process_io(to_wait) {
+        if self.queue_is_done() && self.q_ring.submission().is_empty() {
+            return Err(UblkError::QueueIsDown(-libc::ENODEV));
+        }
+
+        match self.wait_ios(to_wait) {
             Err(r) => Err(r),
             Ok(done) => {
                 for idx in 0..done {