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job: Move defer_to_main_loop to Job

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Move the defer_to_main_loop functionality from BlockJob to Job.

The code can be simplified because we can use job->aio_context in
job_defer_to_main_loop_bh() now, instead of having to access the
BlockDriverState.

Probably taking the data->aio_context lock in addition was already
unnecessary in the old code because we didn't actually make use of
anything protected by the old AioContext except getting the new
AioContext, in case it changed between scheduling the BH and running it.
But it's certainly unnecessary now that the BDS isn't accessed at all
any more.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Kevin Wolf 2018-04-17 16:41:17 +02:00
parent 08be6fe26f
commit 1908a5590c
12 changed files with 97 additions and 110 deletions
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32
job.c
View file

@ -28,6 +28,7 @@
#include "qapi/error.h"
#include "qemu/job.h"
#include "qemu/id.h"
#include "qemu/main-loop.h"
#include "trace-root.h"
static QLIST_HEAD(, Job) jobs = QLIST_HEAD_INITIALIZER(jobs);
@ -170,3 +171,34 @@ void job_unref(Job *job)
g_free(job);
}
}
typedef struct {
Job *job;
JobDeferToMainLoopFn *fn;
void *opaque;
} JobDeferToMainLoopData;
static void job_defer_to_main_loop_bh(void *opaque)
{
JobDeferToMainLoopData *data = opaque;
Job *job = data->job;
AioContext *aio_context = job->aio_context;
aio_context_acquire(aio_context);
data->fn(data->job, data->opaque);
aio_context_release(aio_context);
g_free(data);
}
void job_defer_to_main_loop(Job *job, JobDeferToMainLoopFn *fn, void *opaque)
{
JobDeferToMainLoopData *data = g_malloc(sizeof(*data));
data->job = job;
data->fn = fn;
data->opaque = opaque;
job->deferred_to_main_loop = true;
aio_bh_schedule_oneshot(qemu_get_aio_context(),
job_defer_to_main_loop_bh, data);
}