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block-backend: process I/O in the current AioContext

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Switch blk_aio_*() APIs over to multi-queue by using
qemu_get_current_aio_context() instead of blk_get_aio_context(). This
change will allow devices to process I/O in multiple IOThreads in the
future.

I audited existing blk_aio_*() callers:
- migration/block.c: blk_mig_lock() protects the data accessed by the
  completion callback.
- The remaining emulated devices and exports run with
  qemu_get_aio_context() == blk_get_aio_context().

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230912231037.826804-4-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2023-09-12 19:10:35 -04:00 committed by Kevin Wolf
parent c8bf923d5e
commit 46eb6e861b
1 changed files with 3 additions and 3 deletions
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6
block/block-backend.c
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@ -1547,7 +1547,7 @@ BlockAIOCB *blk_abort_aio_request(BlockBackend *blk,
acb->blk = blk;
acb->ret = ret;
replay_bh_schedule_oneshot_event(blk_get_aio_context(blk),
replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(),
error_callback_bh, acb);
return &acb->common;
}
@ -1601,11 +1601,11 @@ static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset,
acb->has_returned = false;
co = qemu_coroutine_create(co_entry, acb);
aio_co_enter(blk_get_aio_context(blk), co);
aio_co_enter(qemu_get_current_aio_context(), co);
acb->has_returned = true;
if (acb->rwco.ret != NOT_DONE) {
replay_bh_schedule_oneshot_event(blk_get_aio_context(blk),
replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(),
blk_aio_complete_bh, acb);
}