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block/mirror: utilize job_exit shim 

Change the manual deferment to mirror_exit into the implicit
callback to job_exit and the mirror_exit callback.

This does change the order of some bdrv_unref calls and job_completed,
but thanks to the new context in which we call .exit, this is safe to
defer the possible flushing of any nodes to the job_finalize_single
cleanup stage.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20180830015734.19765-6-jsnow@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
John Snow 2018-08-29 21:57:30 -04:00 committed by Max Reitz
parent f369b48dc4
commit 7b508f6b7a
1 changed files with 11 additions and 18 deletions
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29
block/mirror.c
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@ -607,26 +607,22 @@ static void mirror_wait_for_all_io(MirrorBlockJob *s)
}
}
typedef struct {
int ret;
} MirrorExitData;
static void mirror_exit(Job *job, void *opaque)
static void mirror_exit(Job *job)
{
MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job);
BlockJob *bjob = &s->common;
MirrorExitData *data = opaque;
MirrorBDSOpaque *bs_opaque = s->mirror_top_bs->opaque;
AioContext *replace_aio_context = NULL;
BlockDriverState *src = s->mirror_top_bs->backing->bs;
BlockDriverState *target_bs = blk_bs(s->target);
BlockDriverState *mirror_top_bs = s->mirror_top_bs;
Error *local_err = NULL;
int ret = job->ret;
bdrv_release_dirty_bitmap(src, s->dirty_bitmap);
/* Make sure that the source BDS doesn't go away before we called
* job_completed(). */
/* Make sure that the source BDS doesn't go away during bdrv_replace_node,
* before we can call bdrv_drained_end */
bdrv_ref(src);
bdrv_ref(mirror_top_bs);
bdrv_ref(target_bs);
@ -652,7 +648,7 @@ static void mirror_exit(Job *job, void *opaque)
bdrv_set_backing_hd(target_bs, backing, &local_err);
if (local_err) {
error_report_err(local_err);
data->ret = -EPERM;
ret = -EPERM;
}
}
}
@ -662,7 +658,7 @@ static void mirror_exit(Job *job, void *opaque)
aio_context_acquire(replace_aio_context);
}
if (s->should_complete && data->ret == 0) {
if (s->should_complete && ret == 0) {
BlockDriverState *to_replace = src;
if (s->to_replace) {
to_replace = s->to_replace;
@ -679,7 +675,7 @@ static void mirror_exit(Job *job, void *opaque)
bdrv_drained_end(target_bs);
if (local_err) {
error_report_err(local_err);
data->ret = -EPERM;
ret = -EPERM;
}
}
if (s->to_replace) {
@ -710,12 +706,12 @@ static void mirror_exit(Job *job, void *opaque)
blk_insert_bs(bjob->blk, mirror_top_bs, &error_abort);
bs_opaque->job = NULL;
job_completed(job, data->ret);
g_free(data);
bdrv_drained_end(src);
bdrv_unref(mirror_top_bs);
bdrv_unref(src);
job->ret = ret;
}
static void mirror_throttle(MirrorBlockJob *s)
@ -815,7 +811,6 @@ static int mirror_flush(MirrorBlockJob *s)
static int coroutine_fn mirror_run(Job *job, Error **errp)
{
MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job);
MirrorExitData *data;
BlockDriverState *bs = s->mirror_top_bs->backing->bs;
BlockDriverState *target_bs = blk_bs(s->target);
bool need_drain = true;
@ -1035,14 +1030,10 @@ immediate_exit:
g_free(s->in_flight_bitmap);
bdrv_dirty_iter_free(s->dbi);
data = g_malloc(sizeof(*data));
data->ret = ret;
if (need_drain) {
bdrv_drained_begin(bs);
}
job_defer_to_main_loop(&s->common.job, mirror_exit, data);
return ret;
}
@ -1141,6 +1132,7 @@ static const BlockJobDriver mirror_job_driver = {
.user_resume = block_job_user_resume,
.drain = block_job_drain,
.run = mirror_run,
.exit = mirror_exit,
.pause = mirror_pause,
.complete = mirror_complete,
},
@ -1157,6 +1149,7 @@ static const BlockJobDriver commit_active_job_driver = {
.user_resume = block_job_user_resume,
.drain = block_job_drain,
.run = mirror_run,
.exit = mirror_exit,
.pause = mirror_pause,
.complete = mirror_complete,
},