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[3/4] block: Prevent sleeping jobs from resuming if they have been paused

Message ID 3d9011151512326b890d22bdab3530244ef349d7.1464346103.git.berto@igalia.com (mailing list archive)
State New, archived
Headers show

Commit Message

Alberto Garcia May 27, 2016, 10:53 a.m. UTC
If we pause a block job and drain its BlockDriverState we want that
the job remains inactive until we call block_job_resume() again.

However if we pause the job while it is sleeping then it will resume
when the sleep timer fires.

This patch prevents that from happening by checking if the job has
been paused after it comes back from sleeping.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Suggested-by: Kevin Wolf <kwolf@redhat.com>
---
 blockjob.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Max Reitz May 27, 2016, 11:07 a.m. UTC | #1
On 27.05.2016 12:53, Alberto Garcia wrote:
> If we pause a block job and drain its BlockDriverState we want that
> the job remains inactive until we call block_job_resume() again.
> 
> However if we pause the job while it is sleeping then it will resume
> when the sleep timer fires.
> 
> This patch prevents that from happening by checking if the job has
> been paused after it comes back from sleeping.
> 
> Signed-off-by: Alberto Garcia <berto@igalia.com>
> Suggested-by: Kevin Wolf <kwolf@redhat.com>
> ---
>  blockjob.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)

Reviewed-by: Max Reitz <mreitz@redhat.com>
diff mbox

Patch

diff --git a/blockjob.c b/blockjob.c
index c095cc5..01b896b 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -361,10 +361,12 @@  void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
     }
 
     job->busy = false;
+    if (!block_job_is_paused(job)) {
+        co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns);
+    }
+    /* The job can be paused while sleeping, so check this again */
     if (block_job_is_paused(job)) {
         qemu_coroutine_yield();
-    } else {
-        co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns);
     }
     job->busy = true;
 }