diff options
Diffstat (limited to 'block/backup.c')
| -rw-r--r-- | block/backup.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/block/backup.c b/block/backup.c index 763f0d7ff6..db20249063 100644 --- a/block/backup.c +++ b/block/backup.c @@ -741,12 +741,19 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs, job->cluster_size = cluster_size; job->copy_bitmap = copy_bitmap; copy_bitmap = NULL; - job->use_copy_range = !compress; /* compression isn't supported for it */ job->copy_range_size = MIN_NON_ZERO(blk_get_max_transfer(job->common.blk), blk_get_max_transfer(job->target)); - job->copy_range_size = MAX(job->cluster_size, - QEMU_ALIGN_UP(job->copy_range_size, - job->cluster_size)); + job->copy_range_size = QEMU_ALIGN_DOWN(job->copy_range_size, + job->cluster_size); + /* + * Set use_copy_range, consider the following: + * 1. Compression is not supported for copy_range. + * 2. copy_range does not respect max_transfer (it's a TODO), so we factor + * that in here. If max_transfer is smaller than the job->cluster_size, + * we do not use copy_range (in that case it's zero after aligning down + * above). + */ + job->use_copy_range = !compress && job->copy_range_size > 0; /* Required permissions are already taken with target's blk_new() */ block_job_add_bdrv(&job->common, "target", target, 0, BLK_PERM_ALL, |