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blockjob: introduce .drain callback for jobs

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This is required to decouple block jobs from running in an
AioContext.  With multiqueue block devices, a BlockDriverState
does not really belong to a single AioContext.

The solution is to first wait until all I/O operations are
complete; then loop in the main thread for the block job to
complete entirely.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-Id: <1477565348-5458-3-git-send-email-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-27 12:48:50 +02:00 • committed by Fam Zheng
parent 50ab0e0908
commit bae8196d9f
4 changed files with 71 additions and 25 deletions
Download patch file Download diff file Expand all files Collapse all files

17
block/backup.c
View file

@ -300,6 +300,21 @@ void backup_cow_request_end(CowRequest *req)
cow_request_end(req);
}
static void backup_drain(BlockJob *job)
{
BackupBlockJob *s = container_of(job, BackupBlockJob, common);
/* Need to keep a reference in case blk_drain triggers execution
* of backup_complete...
*/
if (s->target) {
BlockBackend *target = s->target;
blk_ref(target);
blk_drain(target);
blk_unref(target);
}
}
static const BlockJobDriver backup_job_driver = {
.instance_size = sizeof(BackupBlockJob),
.job_type = BLOCK_JOB_TYPE_BACKUP,
@ -307,6 +322,7 @@ static const BlockJobDriver backup_job_driver = {
.commit = backup_commit,
.abort = backup_abort,
.attached_aio_context = backup_attached_aio_context,
.drain = backup_drain,
};
static BlockErrorAction backup_error_action(BackupBlockJob *job,
@ -331,6 +347,7 @@ static void backup_complete(BlockJob *job, void *opaque)
BackupCompleteData *data = opaque;
blk_unref(s->target);
s->target = NULL;
block_job_completed(job, data->ret);
g_free(data);