diff options
| -rw-r--r-- | block.c | 23 | ||||
| -rw-r--r-- | block/mirror.c | 9 | ||||
| -rw-r--r-- | blockdev.c | 18 | ||||
| -rw-r--r-- | include/block/block.h | 3 | ||||
| -rw-r--r-- | tests/qemu-iotests/085.out | 2 |
5 files changed, 43 insertions, 12 deletions
@@ -2087,6 +2087,7 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs, int64_t total_size; QemuOpts *opts = NULL; BlockDriverState *bs_snapshot; + Error *local_err = NULL; int ret; /* if snapshot, we create a temporary backing file and open it @@ -2136,7 +2137,12 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs, * call bdrv_unref() on it), so in order to be able to return one, we have * to increase bs_snapshot's refcount here */ bdrv_ref(bs_snapshot); - bdrv_append(bs_snapshot, bs); + bdrv_append(bs_snapshot, bs, &local_err); + if (local_err) { + error_propagate(errp, local_err); + ret = -EINVAL; + goto out; + } g_free(tmp_filename); return bs_snapshot; @@ -2927,20 +2933,25 @@ static void change_parent_backing_link(BlockDriverState *from, * parents of bs_top after bdrv_append() returns. If the caller needs to keep a * reference of its own, it must call bdrv_ref(). */ -void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) +void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, + Error **errp) { + Error *local_err = NULL; + assert(!atomic_read(&bs_top->in_flight)); assert(!atomic_read(&bs_new->in_flight)); - bdrv_ref(bs_top); + bdrv_set_backing_hd(bs_new, bs_top, &local_err); + if (local_err) { + error_propagate(errp, local_err); + goto out; + } change_parent_backing_link(bs_top, bs_new); - /* FIXME Error handling */ - bdrv_set_backing_hd(bs_new, bs_top, &error_abort); - bdrv_unref(bs_top); /* bs_new is now referenced by its new parents, we don't need the * additional reference any more. */ +out: bdrv_unref(bs_new); } diff --git a/block/mirror.c b/block/mirror.c index 8497e0db83..57f26c33a4 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -1099,6 +1099,7 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs, BlockDriverState *mirror_top_bs; bool target_graph_mod; bool target_is_backing; + Error *local_err = NULL; int ret; if (granularity == 0) { @@ -1130,9 +1131,15 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs, * it alive until block_job_create() even if bs has no parent. */ bdrv_ref(mirror_top_bs); bdrv_drained_begin(bs); - bdrv_append(mirror_top_bs, bs); + bdrv_append(mirror_top_bs, bs, &local_err); bdrv_drained_end(bs); + if (local_err) { + bdrv_unref(mirror_top_bs); + error_propagate(errp, local_err); + return; + } + /* Make sure that the source is not resized while the job is running */ s = block_job_create(job_id, driver, mirror_top_bs, BLK_PERM_CONSISTENT_READ, diff --git a/blockdev.c b/blockdev.c index ff781d9df3..8eb4e84fe0 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1768,6 +1768,17 @@ static void external_snapshot_prepare(BlkActionState *common, if (!state->new_bs->drv->supports_backing) { error_setg(errp, "The snapshot does not support backing images"); + return; + } + + /* This removes our old bs and adds the new bs. This is an operation that + * can fail, so we need to do it in .prepare; undoing it for abort is + * always possible. */ + bdrv_ref(state->new_bs); + bdrv_append(state->new_bs, state->old_bs, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; } } @@ -1778,8 +1789,6 @@ static void external_snapshot_commit(BlkActionState *common) bdrv_set_aio_context(state->new_bs, state->aio_context); - /* This removes our old bs and adds the new bs */ - bdrv_append(state->new_bs, state->old_bs); /* We don't need (or want) to use the transactional * bdrv_reopen_multiple() across all the entries at once, because we * don't want to abort all of them if one of them fails the reopen */ @@ -1794,7 +1803,9 @@ static void external_snapshot_abort(BlkActionState *common) ExternalSnapshotState *state = DO_UPCAST(ExternalSnapshotState, common, common); if (state->new_bs) { - bdrv_unref(state->new_bs); + if (state->new_bs->backing) { + bdrv_replace_in_backing_chain(state->new_bs, state->old_bs); + } } } @@ -1805,6 +1816,7 @@ static void external_snapshot_clean(BlkActionState *common) if (state->aio_context) { bdrv_drained_end(state->old_bs); aio_context_release(state->aio_context); + bdrv_unref(state->new_bs); } } diff --git a/include/block/block.h b/include/block/block.h index eac286124d..c7c4a3ac3a 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -236,7 +236,8 @@ int bdrv_create(BlockDriver *drv, const char* filename, QemuOpts *opts, Error **errp); int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); BlockDriverState *bdrv_new(void); -void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); +void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, + Error **errp); void bdrv_replace_in_backing_chain(BlockDriverState *old, BlockDriverState *new); diff --git a/tests/qemu-iotests/085.out b/tests/qemu-iotests/085.out index 08e4bb7218..182acb42cf 100644 --- a/tests/qemu-iotests/085.out +++ b/tests/qemu-iotests/085.out @@ -74,7 +74,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/ === Invalid command - snapshot node used as backing hd === -{"error": {"class": "GenericError", "desc": "Node 'snap_11' is busy: node is used as backing hd of 'virtio0'"}} +{"error": {"class": "GenericError", "desc": "Node 'snap_11' is busy: node is used as backing hd of 'snap_12'"}} === Invalid command - snapshot node has a backing image === |