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block: change flush to co_flush

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Since coroutine operation is now mandatory, convert all bdrv_flush
implementations to coroutines.  For qcow2, this means taking the lock.
Other implementations are simpler and just forward bdrv_flush to the
underlying protocol, so they can avoid the lock.

The bdrv_flush callback is then unused and can be eliminated.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2011-10-20 13:16:24 +02:00 • committed by Kevin Wolf
parent e183ef75cc
commit 8b94ff8573
10 changed files with 29 additions and 33 deletions
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2
block.c
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@ -2892,8 +2892,6 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
qemu_coroutine_yield();
return co.ret;
}
} else if (bs->drv->bdrv_flush) {
return bs->drv->bdrv_flush(bs);
} else {
/*
* Some block drivers always operate in either writethrough or unsafe