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async: Register/unregister aiocontext in graph lock list

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Add/remove the AioContext in aio_context_list in graph-lock.c when it is
created/destroyed. This allows using the graph locking operations from
this AioContext.

In order to allow linking util/async.c with binaries that don't include
the block layer, introduce stubs for (un)register_aiocontext().

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20221207131838.239125-5-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2022-12-07 14:18:24 +01:00 committed by Kevin Wolf
parent 8aa77000c2
commit 587d82fae2
3 changed files with 15 additions and 0 deletions
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10
stubs/graph-lock.c Normal file
View File

@ -0,0 +1,10 @@
#include "qemu/osdep.h"
#include "block/graph-lock.h"
void register_aiocontext(AioContext *ctx)
{
}
void unregister_aiocontext(AioContext *ctx)
{
}

1
stubs/meson.build
View File

@ -13,6 +13,7 @@ stub_ss.add(files('error-printf.c'))
stub_ss.add(files('fdset.c'))
stub_ss.add(files('gdbstub.c'))
stub_ss.add(files('get-vm-name.c'))
stub_ss.add(files('graph-lock.c'))
if linux_io_uring.found()
stub_ss.add(files('io_uring.c'))
endif

4
util/async.c
View File

@ -27,6 +27,7 @@
#include "qapi/error.h"
#include "block/aio.h"
#include "block/thread-pool.h"
#include "block/graph-lock.h"
#include "qemu/main-loop.h"
#include "qemu/atomic.h"
#include "qemu/rcu_queue.h"
@ -376,6 +377,7 @@ aio_ctx_finalize(GSource *source)
qemu_rec_mutex_destroy(&ctx->lock);
qemu_lockcnt_destroy(&ctx->list_lock);
timerlistgroup_deinit(&ctx->tlg);
unregister_aiocontext(ctx);
aio_context_destroy(ctx);
}
@ -574,6 +576,8 @@ AioContext *aio_context_new(Error **errp)
ctx->thread_pool_min = 0;
ctx->thread_pool_max = THREAD_POOL_MAX_THREADS_DEFAULT;
register_aiocontext(ctx);
return ctx;
fail:
g_source_destroy(&ctx->source);