block: Remove bdrv_set_aio_context()
All callers of bdrv_set_aio_context() are eliminated now, they have
moved to bdrv_try_set_aio_context() and related safe functions. Remove
bdrv_set_aio_context().
With this, we can now know that the .set_aio_ctx callback must be
present in bdrv_set_aio_context_ignore() because
bdrv_can_set_aio_context() would have returned false previously, so
instead of checking the condition, we can assert it.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block.c b/block.c
index ddfae15..e3e77fe 100644
--- a/block.c
+++ b/block.c
@@ -5789,8 +5789,17 @@
bs->walking_aio_notifiers = false;
}
-/* @ignore will accumulate all visited BdrvChild object. The caller is
- * responsible for freeing the list afterwards. */
+/*
+ * Changes the AioContext used for fd handlers, timers, and BHs by this
+ * BlockDriverState and all its children and parents.
+ *
+ * The caller must own the AioContext lock for the old AioContext of bs, but it
+ * must not own the AioContext lock for new_context (unless new_context is the
+ * same as the current context of bs).
+ *
+ * @ignore will accumulate all visited BdrvChild object. The caller is
+ * responsible for freeing the list afterwards.
+ */
void bdrv_set_aio_context_ignore(BlockDriverState *bs,
AioContext *new_context, GSList **ignore)
{
@@ -5813,10 +5822,9 @@
if (g_slist_find(*ignore, child)) {
continue;
}
- if (child->role->set_aio_ctx) {
- *ignore = g_slist_prepend(*ignore, child);
- child->role->set_aio_ctx(child, new_context, ignore);
- }
+ assert(child->role->set_aio_ctx);
+ *ignore = g_slist_prepend(*ignore, child);
+ child->role->set_aio_ctx(child, new_context, ignore);
}
bdrv_detach_aio_context(bs);
@@ -5830,16 +5838,6 @@
aio_context_release(new_context);
}
-/* The caller must own the AioContext lock for the old AioContext of bs, but it
- * must not own the AioContext lock for new_context (unless new_context is
- * the same as the current context of bs). */
-void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context)
-{
- GSList *ignore_list = NULL;
- bdrv_set_aio_context_ignore(bs, new_context, &ignore_list);
- g_slist_free(ignore_list);
-}
-
static bool bdrv_parent_can_set_aio_context(BdrvChild *c, AioContext *ctx,
GSList **ignore, Error **errp)
{
diff --git a/docs/devel/multiple-iothreads.txt b/docs/devel/multiple-iothreads.txt
index 4f9012d..aeb997b 100644
--- a/docs/devel/multiple-iothreads.txt
+++ b/docs/devel/multiple-iothreads.txt
@@ -109,7 +109,7 @@
AioContext is a generic event loop that can be used by any QEMU subsystem.
The block layer has support for AioContext integrated. Each BlockDriverState
-is associated with an AioContext using bdrv_set_aio_context() and
+is associated with an AioContext using bdrv_try_set_aio_context() and
bdrv_get_aio_context(). This allows block layer code to process I/O inside the
right AioContext. Other subsystems may wish to follow a similar approach.
@@ -134,5 +134,5 @@
the BlockDriverState's AioContext to avoid the need to acquire/release around
each bdrv_*() call. The functions bdrv_add/remove_aio_context_notifier,
or alternatively blk_add/remove_aio_context_notifier if you use BlockBackends,
-can be used to get a notification whenever bdrv_set_aio_context() moves a
+can be used to get a notification whenever bdrv_try_set_aio_context() moves a
BlockDriverState to a different AioContext.
diff --git a/include/block/block.h b/include/block/block.h
index 531cf59..13ea050 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -583,15 +583,6 @@
*/
void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co);
-/**
- * bdrv_set_aio_context:
- *
- * Changes the #AioContext used for fd handlers, timers, and BHs by this
- * BlockDriverState and all its children.
- *
- * This function must be called with iothread lock held.
- */
-void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context);
void bdrv_set_aio_context_ignore(BlockDriverState *bs,
AioContext *new_context, GSList **ignore);
int bdrv_try_set_aio_context(BlockDriverState *bs, AioContext *ctx,
