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qemu-img: Convert by cluster size if target is compressed

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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 <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2014-05-06 21:08:43 +08:00 • committed by Stefan Hajnoczi
parent ec209aca83
commit 85f49cad87
2 changed files with 5 additions and 0 deletions
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4
include/block/block.h
View file

@ -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 {

1
qemu-img.c
View file

@ -1502,6 +1502,7 @@ 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;
}