diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-10-27 12:48:50 +0200 |
|---|---|---|
| committer | Fam Zheng <famz@redhat.com> | 2016-10-28 21:50:18 +0800 |
| commit | bae8196d9f97916de6323e70e3e374362ee16ec4 (patch) | |
| tree | d733f20bed98d2ddaf2a66709fb81f20c9f31d2b /include/block/blockjob.h | |
| parent | 50ab0e0908d592b8bda56c2d7495e1190d734b0b (diff) | |
| download | qemu-bae8196d9f97916de6323e70e3e374362ee16ec4.tar.gz | |
blockjob: introduce .drain callback for jobs
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>
Diffstat (limited to 'include/block/blockjob.h')
| -rw-r--r-- | include/block/blockjob.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/block/blockjob.h b/include/block/blockjob.h index 4ddb4ae2e1..2bb39f4d29 100644 --- a/include/block/blockjob.h +++ b/include/block/blockjob.h @@ -92,6 +92,13 @@ typedef struct BlockJobDriver { * besides job->blk to the new AioContext. */ void (*attached_aio_context)(BlockJob *job, AioContext *new_context); + + /* + * If the callback is not NULL, it will be invoked when the job has to be + * synchronously cancelled or completed; it should drain BlockDriverStates + * as required to ensure progress. + */ + void (*drain)(BlockJob *job); } BlockJobDriver; /** |