block: Drop aio/cache consistency check from qmp_blockdev_add()

The TODO comment has been addressed a while ago and this is now checked
in raw-posix, so we don't have to special case this in blockdev-add any
more.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NMax Reitz <mreitz@redhat.com>

blockdev.c

@@ -3832,21 +3832,6 @@ void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
     QDict *qdict;
     Error *local_err = NULL;
 
-    /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
-     * cache.direct=false instead of silently switching to aio=threads, except
-     * when called from drive_new().
-     *
-     * For now, simply forbidding the combination for all drivers will do. */
-    if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
-        bool direct = options->has_cache &&
-                      options->cache->has_direct &&
-                      options->cache->direct;
-        if (!direct) {
-            error_setg(errp, "aio=native requires cache.direct=true");
-            goto fail;
-        }
-    }
-
     visit_type_BlockdevOptions(v, NULL, &options, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);

tests/qemu-iotests/087.out

@@ -27,7 +27,7 @@ QMP_VERSION
 Testing:
 QMP_VERSION
 {"return": {}}
-{"error": {"class": "GenericError", "desc": "aio=native requires cache.direct=true"}}
+{"error": {"class": "GenericError", "desc": "aio=native was specified, but it requires cache.direct=on, which was not specified."}}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "SHUTDOWN"}