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block: Add assertion for bdrv_graph_wrlock()

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bdrv_graph_wrlock() can't run in a coroutine (because it polls) and
requires holding the BQL. We already have GLOBAL_STATE_CODE() to assert
the latter. Assert the former as well and add a no_coroutine_fn marker.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230929145157.45443-23-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-09-29 16:51:57 +02:00
parent 680e0cc40c
commit e6e964b8b0
2 changed files with 4 additions and 2 deletions
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3
block/graph-lock.c
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@ -106,12 +106,13 @@ static uint32_t reader_count(void)
return rd;
}
void bdrv_graph_wrlock(BlockDriverState *bs)
void no_coroutine_fn bdrv_graph_wrlock(BlockDriverState *bs)
{
AioContext *ctx = NULL;
GLOBAL_STATE_CODE();
assert(!qatomic_read(&has_writer));
assert(!qemu_in_coroutine());
/*
* Release only non-mainloop AioContext. The mainloop often relies on the