diff options
Diffstat (limited to 'include/block')
| -rw-r--r-- | include/block/block_int-global-state.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/block/block_int-global-state.h b/include/block/block_int-global-state.h index 5078d6a6ea..0f21b0570b 100644 --- a/include/block/block_int-global-state.h +++ b/include/block/block_int-global-state.h @@ -309,4 +309,21 @@ void bdrv_remove_aio_context_notifier(BlockDriverState *bs, */ void bdrv_drain_all_end_quiesce(BlockDriverState *bs); +/** + * Make sure that the function is running under both drain and BQL. + * The latter protects from concurrent writings + * from the GS API, while the former prevents concurrent reads + * from I/O. + */ +static inline void assert_bdrv_graph_writable(BlockDriverState *bs) +{ + /* + * TODO: this function is incomplete. Because the users of this + * assert lack the necessary drains, check only for BQL. + * Once the necessary drains are added, + * assert also for qatomic_read(&bs->quiesce_counter) > 0 + */ + assert(qemu_in_main_thread()); +} + #endif /* BLOCK_INT_GLOBAL_STATE */ |