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block: Use normal drain for bdrv_set_aio_context()

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Now that bdrv_set_aio_context() works inside drained sections, it can
also use the real drain function instead of open coding something
similar.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2019-02-08 16:53:37 +01:00
parent 247d273771
commit d70d595429
1 changed files with 6 additions and 9 deletions
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15
block.c
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@ -5268,18 +5268,16 @@ void bdrv_attach_aio_context(BlockDriverState *bs,
bs->walking_aio_notifiers = false;
}
/* 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)
{
AioContext *ctx = bdrv_get_aio_context(bs);
if (ctx == new_context) {
if (bdrv_get_aio_context(bs) == new_context) {
return;
}
aio_disable_external(ctx);
bdrv_parent_drained_begin(bs, NULL, false);
bdrv_drain(bs); /* ensure there are no in-flight requests */
bdrv_drained_begin(bs);
bdrv_detach_aio_context(bs);
/* This function executes in the old AioContext so acquire the new one in
@ -5287,8 +5285,7 @@ void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context)
*/
aio_context_acquire(new_context);
bdrv_attach_aio_context(bs, new_context);
bdrv_parent_drained_end(bs, NULL, false);
aio_enable_external(ctx);
bdrv_drained_end(bs);
aio_context_release(new_context);
}