block: Assertions for resize permission

This adds an assertion that ensures that the necessary resize permission has been granted before bdrv_truncate() is called. Signed-off-by: Kevin Wolf <[email protected]> Reviewed-by: Max Reitz <[email protected]> Acked-by: Fam Zheng <[email protected]>
itfvck · Feb 28, 2017 · c8f6d58 · c8f6d58
1 parent afa4b29
commit c8f6d58
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diff --git a/block.c b/block.c
@@ -3122,6 +3122,9 @@ int bdrv_truncate(BdrvChild *child, int64_t offset)
     BlockDriverState *bs = child->bs;
     BlockDriver *drv = bs->drv;
     int ret;
+
+    assert(child->perm & BLK_PERM_RESIZE);
+
     if (!drv)
         return -ENOMEDIUM;
     if (!drv->bdrv_truncate)

diff --git a/block/io.c b/block/io.c
@@ -1339,6 +1339,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
     assert(req->overlap_offset <= offset);
     assert(offset + bytes <= req->overlap_offset + req->overlap_bytes);
     assert(child->perm & BLK_PERM_WRITE);
+    assert(end_sector <= bs->total_sectors || child->perm & BLK_PERM_RESIZE);
 
     ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req);