diff options
Diffstat (limited to 'block/stream.c')
| -rw-r--r-- | block/stream.c | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/block/stream.c b/block/stream.c index 8744ad103f..22368ce186 100644 --- a/block/stream.c +++ b/block/stream.c @@ -161,21 +161,25 @@ static int coroutine_fn stream_run(Job *job, Error **errp) copy = false; - ret = bdrv_is_allocated(unfiltered_bs, offset, STREAM_CHUNK, &n); - if (ret == 1) { - /* Allocated in the top, no need to copy. */ - } else if (ret >= 0) { - /* Copy if allocated in the intermediate images. Limit to the - * known-unallocated area [offset, offset+n*BDRV_SECTOR_SIZE). */ - ret = bdrv_is_allocated_above(bdrv_cow_bs(unfiltered_bs), - s->base_overlay, true, - offset, n, &n); - /* Finish early if end of backing file has been reached */ - if (ret == 0 && n == 0) { - n = len - offset; + WITH_GRAPH_RDLOCK_GUARD() { + ret = bdrv_is_allocated(unfiltered_bs, offset, STREAM_CHUNK, &n); + if (ret == 1) { + /* Allocated in the top, no need to copy. */ + } else if (ret >= 0) { + /* + * Copy if allocated in the intermediate images. Limit to the + * known-unallocated area [offset, offset+n*BDRV_SECTOR_SIZE). + */ + ret = bdrv_is_allocated_above(bdrv_cow_bs(unfiltered_bs), + s->base_overlay, true, + offset, n, &n); + /* Finish early if end of backing file has been reached */ + if (ret == 0 && n == 0) { + n = len - offset; + } + + copy = (ret > 0); } - - copy = (ret > 0); } trace_stream_one_iteration(s, offset, n, ret); if (copy) { |