If target block driver forces compression, qemu-img convert needs to
write by cluster size as well as "-c" option.
Particularly, this applies for converting to VMDK streamOptimized
format.
Signed-off-by: Fam Zheng <f...@redhat.com>
---
include/block/block.h | 4 ++++
qemu-img.c | 1 +
2 files changed, 5 insertions(+)
diff --git a/include/block/block.h b/include/block/block.h
index 467fb2b..27d8598 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -34,6 +34,10 @@ typedef struct BlockDriverInfo {
* opened with BDRV_O_UNMAP flag for this to work.
*/
bool can_write_zeroes_with_unmap;
+ /*
+ * True if this block driver only supports compressed writes
+ */
+ bool needs_compressed_writes;
} BlockDriverInfo;
typedef struct BlockFragInfo {
diff --git a/qemu-img.c b/qemu-img.c
index 96f4463..ed4471b 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1480,6 +1480,7 @@ static int img_convert(int argc, char **argv)
goto out;
}
} else {
+ compress = compress || bdi.needs_compressed_writes;
cluster_sectors = bdi.cluster_size / BDRV_SECTOR_SIZE;
}
--
1.9.2
