block: Assert no write requests under BDRV_O_INCOMING
As long as BDRV_O_INCOMING is set, the image file is only opened so we
have a file descriptor for it. We're definitely not supposed to modify
the image, it's still owned by the migration source.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
diff --git a/block/io.c b/block/io.c
index 707c04b..2372994 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1301,6 +1301,7 @@
if (bs->read_only) {
return -EPERM;
}
+ assert(!(bs->open_flags & BDRV_O_INCOMING));
ret = bdrv_check_byte_request(bs, offset, bytes);
if (ret < 0) {
@@ -2462,6 +2463,7 @@
} else if (bs->read_only) {
return -EPERM;
}
+ assert(!(bs->open_flags & BDRV_O_INCOMING));
/* Do nothing if disabled. */
if (!(bs->open_flags & BDRV_O_UNMAP)) {
