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linux-aio: use LinuxAioState from the running thread

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Remove usage of aio_context_acquire by always submitting asynchronous
AIO to the current thread's LinuxAioState.

In order to prevent mistakes from the caller side, avoid passing LinuxAioState
in laio_io_{plug/unplug} and laio_co_submit, and document the functions
to make clear that they work in the current thread's AioContext.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20230203131731.851116-2-eesposit@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2023-02-03 08:17:28 -05:00 • committed by Kevin Wolf
parent e95200c1c5
commit ab50533b69
5 changed files with 37 additions and 29 deletions
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5
include/sysemu/block-backend-io.h
View file

@ -90,6 +90,11 @@ void blk_iostatus_set_err(BlockBackend *blk, int error);
int blk_get_max_iov(BlockBackend *blk);
int blk_get_max_hw_iov(BlockBackend *blk);
/*
* blk_io_plug/unplug are thread-local operations. This means that multiple
* IOThreads can simultaneously call plug/unplug, but the caller must ensure
* that each unplug() is called in the same IOThread of the matching plug().
*/
void coroutine_fn blk_co_io_plug(BlockBackend *blk);
void co_wrapper blk_io_plug(BlockBackend *blk);