[Qemu-block] [PATCH 3/7] blockjob: create block_job_throttle

[John Snow]

This will replace mirror_throttle, for reuse in other jobs.

Signed-off-by: John Snow <address@hidden>
---
 block/mirror.c               | 15 ++-------------
 blockjob.c                   | 11 +++++++++++
 include/block/blockjob_int.h |  9 +++++++++
 3 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index eef5b598f5..60b52cfb19 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -590,17 +590,6 @@ static void mirror_exit(BlockJob *job, void *opaque)
     bdrv_unref(src);
 }
 
-static void mirror_throttle(MirrorBlockJob *s)
-{
-    int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
-
-    if (now - s->common.last_yield_ns > SLICE_TIME) {
-        block_job_sleep_ns(&s->common, 0);
-    } else {
-        block_job_pause_point(&s->common);
-    }
-}
-
 static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
 {
     int64_t offset;
@@ -621,7 +610,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
             int bytes = MIN(s->bdev_length - offset,
                             QEMU_ALIGN_DOWN(INT_MAX, s->granularity));
 
-            mirror_throttle(s);
+            block_job_throttle(&s->common);
 
             if (block_job_is_cancelled(&s->common)) {
                 s->initial_zeroing_ongoing = false;
@@ -649,7 +638,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
         int bytes = MIN(s->bdev_length - offset,
                         QEMU_ALIGN_DOWN(INT_MAX, s->granularity));
 
-        mirror_throttle(s);
+        block_job_throttle(&s->common);
 
         if (block_job_is_cancelled(&s->common)) {
             return 0;
diff --git a/blockjob.c b/blockjob.c
index 8cbc142f57..8d0c89a813 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -882,6 +882,17 @@ void block_job_yield(BlockJob *job)
     block_job_pause_point(job);
 }
 
+void block_job_throttle(BlockJob *job)
+{
+    int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
+
+    if (now - job->last_yield_ns > SLICE_TIME) {
+        block_job_sleep_ns(job, 0);
+    } else {
+        block_job_pause_point(job);
+    }
+}
+
 void block_job_iostatus_reset(BlockJob *job)
 {
     if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
diff --git a/include/block/blockjob_int.h b/include/block/blockjob_int.h
index 209fa1bb3e..1a771b1e2e 100644
--- a/include/block/blockjob_int.h
+++ b/include/block/blockjob_int.h
@@ -157,6 +157,15 @@ void block_job_sleep_ns(BlockJob *job, int64_t ns);
  */
 void block_job_yield(BlockJob *job);
 
+/**
+ * block_job_throttle:
+ * @job: The job that calls the function.
+ *
+ * Yield if it has been SLICE_TIME nanoseconds since the last yield.
+ * Otherwise, check if we need to pause (and update the yield counter).
+ */
+void block_job_throttle(BlockJob *job);
+
 /**
  * block_job_pause_all:
  *
-- 
2.14.3