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block: Make bdrv_child_get_parent_aio_context I/O

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We want to use bdrv_child_get_parent_aio_context() from
bdrv_parent_drained_{begin,end}_single(), both of which are "I/O or GS"
functions.

Prior to 3ed4f708fe, all the implementations were I/O code anyway.
3ed4f708fe has put block jobs' AioContext field under the job mutex, so
to make child_job_get_parent_aio_context() work in an I/O context, we
need to take that lock there.

Furthermore, blk_root_get_parent_aio_context() is not marked as
anything, but is safe to run in an I/O context, so mark it that way now.
(blk_get_aio_context() is an I/O code function.)

With that done, all implementations explicitly are I/O code, so we can
mark bdrv_child_get_parent_aio_context() as I/O code, too, so callers
know it is safe to run from both GS and I/O contexts.

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20221107151321.211175-2-hreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Hanna Reitz 2022-11-07 16:13:19 +01:00 • committed by Kevin Wolf
parent e56b0c6631
commit d5f8d79c2f
6 changed files with 8 additions and 5 deletions
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2
include/block/block-io.h
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@ -171,6 +171,8 @@ void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event);
*/
AioContext *bdrv_get_aio_context(BlockDriverState *bs);
AioContext *bdrv_child_get_parent_aio_context(BdrvChild *c);
/**
* Move the current coroutine to the AioContext of @bs and return the old
* AioContext of the coroutine. Increase bs->in_flight so that draining @bs