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| author | John Snow <jsnow@redhat.com> | 2016-11-08 01:50:38 -0500 |
|---|---|---|
| committer | Jeff Cody <jcody@redhat.com> | 2016-11-14 22:47:34 -0500 |
| commit | 111049a4ecefc9cf1ac75c773f4c5c165f27fe63 (patch) | |
| tree | 60b90cb15047f7da10623da590f61c2500895cdc /block/replication.c | |
| parent | 5ccac6f186e4a480074880d958760c7105cf9ba8 (diff) | |
| download | qemu-111049a4ecefc9cf1ac75c773f4c5c165f27fe63.tar.gz | |
blockjob: refactor backup_start as backup_job_create
Refactor backup_start as backup_job_create, which only creates the job,
but does not automatically start it. The old interface, 'backup_start',
is not kept in favor of limiting the number of nearly-identical interfaces
that would have to be edited to keep up with QAPI changes in the future.
Callers that wish to synchronously start the backup_block_job can
instead just call block_job_start immediately after calling
backup_job_create.
Transactions are updated to use the new interface, calling block_job_start
only during the .commit phase, which helps prevent race conditions where
jobs may finish before we even finish building the transaction. This may
happen, for instance, during empty block backup jobs.
Reported-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1478587839-9834-6-git-send-email-jsnow@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
Diffstat (limited to 'block/replication.c')
| -rw-r--r-- | block/replication.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/block/replication.c b/block/replication.c index d5e2b0f497..729dd12499 100644 --- a/block/replication.c +++ b/block/replication.c @@ -421,6 +421,7 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode, int64_t active_length, hidden_length, disk_length; AioContext *aio_context; Error *local_err = NULL; + BlockJob *job; aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); @@ -508,17 +509,18 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode, bdrv_op_block_all(top_bs, s->blocker); bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); - backup_start(NULL, s->secondary_disk->bs, s->hidden_disk->bs, 0, - MIRROR_SYNC_MODE_NONE, NULL, false, - BLOCKDEV_ON_ERROR_REPORT, BLOCKDEV_ON_ERROR_REPORT, - BLOCK_JOB_INTERNAL, backup_job_completed, bs, - NULL, &local_err); + job = backup_job_create(NULL, s->secondary_disk->bs, s->hidden_disk->bs, + 0, MIRROR_SYNC_MODE_NONE, NULL, false, + BLOCKDEV_ON_ERROR_REPORT, + BLOCKDEV_ON_ERROR_REPORT, BLOCK_JOB_INTERNAL, + backup_job_completed, bs, NULL, &local_err); if (local_err) { error_propagate(errp, local_err); backup_job_cleanup(bs); aio_context_release(aio_context); return; } + block_job_start(job); break; default: aio_context_release(aio_context); |