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[Qemu-devel] [PATCH v2 09/13] jobs: remove .exit callback


From: John Snow
Subject: [Qemu-devel] [PATCH v2 09/13] jobs: remove .exit callback
Date: Thu, 23 Aug 2018 18:22:45 -0400

Now that all of the jobs use the component finalization callbacks,
there's no use for the heavy-hammer .exit callback anymore.

job_exit becomes a glorified type shim so that we can call
job_completed from aio_bh_schedule_oneshot.

Move these three functions down into job.c to eliminate a
forward reference.

Signed-off-by: John Snow <address@hidden>
---
 include/qemu/job.h        | 11 -------
 job.c                     | 77 +++++++++++++++++++++--------------------------
 tests/test-blockjob-txn.c |  4 +--
 3 files changed, 36 insertions(+), 56 deletions(-)

diff --git a/include/qemu/job.h b/include/qemu/job.h
index 858cc2b37a..c5409c4b2d 100644
--- a/include/qemu/job.h
+++ b/include/qemu/job.h
@@ -213,17 +213,6 @@ struct JobDriver {
      */
     void (*drain)(Job *job);
 
-    /**
-     * If the callback is not NULL, exit will be invoked from the main thread
-     * when the job's coroutine has finished, but before transactional
-     * convergence; before @prepare or @abort.
-     *
-     * FIXME TODO: This callback is only temporary to transition remaining jobs
-     * to prepare/commit/abort/clean callbacks and will be removed before 3.1.
-     * is released.
-     */
-    void (*exit)(Job *job);
-
     /**
      * If the callback is not NULL, prepare will be invoked when all the jobs
      * belonging to the same transaction complete; or upon this job's 
completion
diff --git a/job.c b/job.c
index 01dd97fee3..72f7de1f36 100644
--- a/job.c
+++ b/job.c
@@ -535,49 +535,6 @@ void job_drain(Job *job)
     }
 }
 
-static void job_completed(Job *job);
-
-static void job_exit(void *opaque)
-{
-    Job *job = (Job *)opaque;
-    AioContext *aio_context = job->aio_context;
-
-    if (job->driver->exit) {
-        aio_context_acquire(aio_context);
-        job->driver->exit(job);
-        aio_context_release(aio_context);
-    }
-    job_completed(job);
-}
-
-/**
- * All jobs must allow a pause point before entering their job proper. This
- * ensures that jobs can be paused prior to being started, then resumed later.
- */
-static void coroutine_fn job_co_entry(void *opaque)
-{
-    Job *job = opaque;
-
-    assert(job && job->driver && job->driver->run);
-    job_pause_point(job);
-    job->ret = job->driver->run(job, &job->err);
-    job->deferred_to_main_loop = true;
-    aio_bh_schedule_oneshot(qemu_get_aio_context(), job_exit, job);
-}
-
-
-void job_start(Job *job)
-{
-    assert(job && !job_started(job) && job->paused &&
-           job->driver && job->driver->run);
-    job->co = qemu_coroutine_create(job_co_entry, job);
-    job->pause_count--;
-    job->busy = true;
-    job->paused = false;
-    job_state_transition(job, JOB_STATUS_RUNNING);
-    aio_co_enter(job->aio_context, job->co);
-}
-
 /* Assumes the block_job_mutex is held */
 static bool job_timer_not_pending(Job *job)
 {
@@ -894,6 +851,40 @@ static void job_completed(Job *job)
     }
 }
 
+/** Useful only as a type shim for aio_bh_schedule_oneshot. */
+static void job_exit(void *opaque)
+{
+    Job *job = (Job *)opaque;
+    job_completed(job);
+}
+
+/**
+ * All jobs must allow a pause point before entering their job proper. This
+ * ensures that jobs can be paused prior to being started, then resumed later.
+ */
+static void coroutine_fn job_co_entry(void *opaque)
+{
+    Job *job = opaque;
+
+    assert(job && job->driver && job->driver->run);
+    job_pause_point(job);
+    job->ret = job->driver->run(job, &job->err);
+    job->deferred_to_main_loop = true;
+    aio_bh_schedule_oneshot(qemu_get_aio_context(), job_exit, job);
+}
+
+void job_start(Job *job)
+{
+    assert(job && !job_started(job) && job->paused &&
+           job->driver && job->driver->run);
+    job->co = qemu_coroutine_create(job_co_entry, job);
+    job->pause_count--;
+    job->busy = true;
+    job->paused = false;
+    job_state_transition(job, JOB_STATUS_RUNNING);
+    aio_co_enter(job->aio_context, job->co);
+}
+
 void job_cancel(Job *job, bool force)
 {
     if (job->status == JOB_STATUS_CONCLUDED) {
diff --git a/tests/test-blockjob-txn.c b/tests/test-blockjob-txn.c
index ef29f35e44..86606f92b3 100644
--- a/tests/test-blockjob-txn.c
+++ b/tests/test-blockjob-txn.c
@@ -24,7 +24,7 @@ typedef struct {
     int *result;
 } TestBlockJob;
 
-static void test_block_job_exit(Job *job)
+static void test_block_job_clean(Job *job)
 {
     BlockJob *bjob = container_of(job, BlockJob, job);
     BlockDriverState *bs = blk_bs(bjob->blk);
@@ -73,7 +73,7 @@ static const BlockJobDriver test_block_job_driver = {
         .user_resume   = block_job_user_resume,
         .drain         = block_job_drain,
         .run           = test_block_job_run,
-        .exit          = test_block_job_exit,
+        .clean         = test_block_job_clean,
     },
 };
 
-- 
2.14.4




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