diff options
| -rw-r--r-- | qemu-img.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/qemu-img.c b/qemu-img.c index 2b2a3a86ca..e61d996e0f 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -3759,8 +3759,13 @@ static int img_rebase(int argc, char **argv) int64_t n; float local_progress = 0; - buf_old = blk_blockalign(blk, IO_BUF_SIZE); - buf_new = blk_blockalign(blk, IO_BUF_SIZE); + if (blk_old_backing && bdrv_opt_mem_align(blk_bs(blk_old_backing)) > + bdrv_opt_mem_align(blk_bs(blk))) { + buf_old = blk_blockalign(blk_old_backing, IO_BUF_SIZE); + } else { + buf_old = blk_blockalign(blk, IO_BUF_SIZE); + } + buf_new = blk_blockalign(blk_new_backing, IO_BUF_SIZE); size = blk_getlength(blk); if (size < 0) { |