[Qemu-devel] [PATCH v2 03/11] Blockjobs: Internalize user_pause logic

[John Snow]

BlockJobs will begin hiding their state in preparation for some
refactorings anyway, so let's internalize the user_pause mechanism
instead of leaving it to callers to correctly manage.

Signed-off-by: John Snow <js...@redhat.com>
---
 block/io.c               |  2 +-
 blockdev.c               | 10 ++++------
 blockjob.c               | 16 ++++++++++++----
 include/block/blockjob.h | 11 ++++++++++-
 4 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/block/io.c b/block/io.c
index fdf7080..868b065 100644
--- a/block/io.c
+++ b/block/io.c
@@ -291,7 +291,7 @@ void bdrv_drain_all(void)
         AioContext *aio_context = blk_get_aio_context(job->blk);
 
         aio_context_acquire(aio_context);
-        block_job_pause(job);
+        block_job_pause(job, false);
         aio_context_release(aio_context);
     }
 
diff --git a/blockdev.c b/blockdev.c
index 03200e7..268452f 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -3629,7 +3629,7 @@ void qmp_block_job_cancel(const char *device,
         force = false;
     }
 
-    if (job->user_paused && !force) {
+    if (block_job_paused(job) && !force) {
         error_setg(errp, "The block job for device '%s' is currently paused",
                    device);
         goto out;
@@ -3646,13 +3646,12 @@ void qmp_block_job_pause(const char *device, Error 
**errp)
     AioContext *aio_context;
     BlockJob *job = find_block_job(device, &aio_context, errp);
 
-    if (!job || job->user_paused) {
+    if (!job || block_job_paused(job)) {
         return;
     }
 
-    job->user_paused = true;
     trace_qmp_block_job_pause(job);
-    block_job_pause(job);
+    block_job_pause(job, true);
     aio_context_release(aio_context);
 }
 
@@ -3661,11 +3660,10 @@ void qmp_block_job_resume(const char *device, Error 
**errp)
     AioContext *aio_context;
     BlockJob *job = find_block_job(device, &aio_context, errp);
 
-    if (!job || !job->user_paused) {
+    if (!job || !block_job_paused(job)) {
         return;
     }
 
-    job->user_paused = false;
     trace_qmp_block_job_resume(job);
     block_job_iostatus_reset(job);
     block_job_resume(job);
diff --git a/blockjob.c b/blockjob.c
index 6a300ba..2a35f50 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -104,7 +104,7 @@ static void block_job_detach_aio_context(void *opaque)
     /* In case the job terminates during aio_poll()... */
     block_job_ref(job);
 
-    block_job_pause(job);
+    block_job_pause(job, false);
 
     if (!job->paused) {
         /* If job is !job->busy this kicks it into the next pause point. */
@@ -343,9 +343,12 @@ void block_job_complete(BlockJob *job, Error **errp)
     job->driver->complete(job, errp);
 }
 
-void block_job_pause(BlockJob *job)
+void block_job_pause(BlockJob *job, bool user)
 {
     job->pause_count++;
+    if (user) {
+        job->user_paused = true;
+    }
 }
 
 static bool block_job_should_pause(BlockJob *job)
@@ -353,6 +356,11 @@ static bool block_job_should_pause(BlockJob *job)
     return job->pause_count > 0;
 }
 
+bool block_job_paused(BlockJob *job)
+{
+    return job ? job->user_paused : 0;
+}
+
 void coroutine_fn block_job_pause_point(BlockJob *job)
 {
     if (!block_job_should_pause(job)) {
@@ -386,6 +394,7 @@ void block_job_resume(BlockJob *job)
     if (job->pause_count) {
         return;
     }
+    job->user_paused = false;
     block_job_enter(job);
 }
 
@@ -592,8 +601,7 @@ BlockErrorAction block_job_error_action(BlockJob *job, 
BlockdevOnError on_err,
                                     action, &error_abort);
     if (action == BLOCK_ERROR_ACTION_STOP) {
         /* make the pause user visible, which will be resumed from QMP. */
-        job->user_paused = true;
-        block_job_pause(job);
+        block_job_pause(job, true);
         block_job_iostatus_set_err(job, error);
     }
     return action;
diff --git a/include/block/blockjob.h b/include/block/blockjob.h
index 4ddb4ae..081f6c2 100644
--- a/include/block/blockjob.h
+++ b/include/block/blockjob.h
@@ -347,10 +347,19 @@ void coroutine_fn block_job_pause_point(BlockJob *job);
 /**
  * block_job_pause:
  * @job: The job to be paused.
+ * @user: Requested explicitly via user?
  *
  * Asynchronously pause the specified job.
  */
-void block_job_pause(BlockJob *job);
+void block_job_pause(BlockJob *job, bool user);
+
+/**
+ * block_job_paused:
+ * @job: The job to query.
+ *
+ * Returns true if the job is user-paused.
+ */
+bool block_job_paused(BlockJob *job);
 
 /**
  * block_job_resume:
-- 
2.7.4