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authorKevin Wolf <kwolf@redhat.com>2014-06-04 15:09:35 +0200
committerKevin Wolf <kwolf@redhat.com>2014-06-26 13:51:01 +0200
commit8ee79e707a005c9274df7ce34265bb7d008b8cef (patch)
treef8402fad14af55bef4457d8a5888db05d1d11fec /block/cow.c
parent76c591b013782217cad67b35c74cd249e0413439 (diff)
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block: Catch backing files assigned to non-COW drivers
Since we parse backing.* options to add a backing file from the command line when the driver didn't assign one, it has been possible to have a backing file for e.g. raw images (it just was never accessed). This is obvious nonsense and should be rejected. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'block/cow.c')
-rw-r--r--block/cow.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/block/cow.c b/block/cow.c
index a05a92c..8f81ee6 100644
--- a/block/cow.c
+++ b/block/cow.c
@@ -414,6 +414,7 @@ static BlockDriver bdrv_cow = {
.bdrv_close = cow_close,
.bdrv_create = cow_create,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
+ .supports_backing = true,
.bdrv_read = cow_co_read,
.bdrv_write = cow_co_write,