diff options
| -rw-r--r-- | qemu-img.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/qemu-img.c b/qemu-img.c index 585b65640f..2b2a3a86ca 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -3814,6 +3814,8 @@ static int img_rebase(int argc, char **argv) } if (prefix_chain_bs) { + uint64_t bytes = n; + /* * If cluster wasn't changed since prefix_chain, we don't need * to take action @@ -3826,9 +3828,18 @@ static int img_rebase(int argc, char **argv) strerror(-ret)); goto out; } - if (!ret) { + if (!ret && n) { continue; } + if (!n) { + /* + * If we've reached EOF of the old backing, it means that + * offsets beyond the old backing size were read as zeroes. + * Now we will need to explicitly zero the cluster in + * order to preserve that state after the rebase. + */ + n = bytes; + } } /* |