Call blk_is_available() before using blk_bs() to obtain the root BlockDriverState behind the BlockBackend.
Signed-off-by: Max Reitz <mre...@redhat.com> --- blockdev.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/blockdev.c b/blockdev.c index 74d26a6..431afcd 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2213,6 +2213,7 @@ void qmp_block_commit(const char *device, bool has_speed, int64_t speed, Error **errp) { + BlockBackend *blk; BlockDriverState *bs; BlockDriverState *base_bs, *top_bs; AioContext *aio_context; @@ -2231,15 +2232,21 @@ void qmp_block_commit(const char *device, * live commit feature versions; for this to work, we must make sure to * perform the device lookup before any generic errors that may occur in a * scenario in which all optional arguments are omitted. */ - bs = bdrv_find(device); - if (!bs) { + blk = blk_by_name(device); + if (!blk) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return; } - aio_context = bdrv_get_aio_context(bs); + aio_context = blk_get_aio_context(blk); aio_context_acquire(aio_context); + if (!blk_is_available(blk)) { + error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); + goto out; + } + bs = blk_bs(blk); + /* drain all i/o before commits */ bdrv_drain_all(); -- 2.1.0