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block/stream: refactor stream to use job callbacks 

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20180906130225.5118-8-jsnow@redhat.com
Reviewed-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
master
John Snow 2018-09-06 09:02:16 -04:00 committed by Max Reitz
parent 737efc1eda
commit 1b57488acf
1 changed files with 15 additions and 8 deletions
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23
block/stream.c
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@ -54,16 +54,16 @@ static int coroutine_fn stream_populate(BlockBackend *blk,
return blk_co_preadv(blk, offset, qiov.size, &qiov, BDRV_REQ_COPY_ON_READ);
}
static void stream_exit(Job *job)
static int stream_prepare(Job *job)
{
StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
BlockJob *bjob = &s->common;
BlockDriverState *bs = blk_bs(bjob->blk);
BlockDriverState *base = s->base;
Error *local_err = NULL;
int ret = job->ret;
int ret = 0;
if (!job_is_cancelled(job) && bs->backing && ret == 0) {
if (bs->backing) {
const char *base_id = NULL, *base_fmt = NULL;
if (base) {
base_id = s->backing_file_str;
@ -75,12 +75,19 @@ static void stream_exit(Job *job)
bdrv_set_backing_hd(bs, base, &local_err);
if (local_err) {
error_report_err(local_err);
ret = -EPERM;
goto out;
return -EPERM;
}
}
out:
return ret;
}
static void stream_clean(Job *job)
{
StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
BlockJob *bjob = &s->common;
BlockDriverState *bs = blk_bs(bjob->blk);
/* Reopen the image back in read-only mode if necessary */
if (s->bs_flags != bdrv_get_flags(bs)) {
/* Give up write permissions before making it read-only */
@ -89,7 +96,6 @@ out:
}
g_free(s->backing_file_str);
job->ret = ret;
}
static int coroutine_fn stream_run(Job *job, Error **errp)
@ -206,7 +212,8 @@ static const BlockJobDriver stream_job_driver = {
.job_type = JOB_TYPE_STREAM,
.free = block_job_free,
.run = stream_run,
.exit = stream_exit,
.prepare = stream_prepare,
.clean = stream_clean,
.user_resume = block_job_user_resume,
.drain = block_job_drain,
},