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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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6
block/vpc.c
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@ -467,9 +467,9 @@ static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num,
return ret;
}
static int vpc_flush(BlockDriverState *bs)
static coroutine_fn int vpc_co_flush(BlockDriverState *bs)
{
return bdrv_flush(bs->file);
return bdrv_co_flush(bs->file);
}
/*
@ -665,7 +665,7 @@ static BlockDriver bdrv_vpc = {
.bdrv_open = vpc_open,
.bdrv_read = vpc_co_read,
.bdrv_write = vpc_co_write,
.bdrv_flush = vpc_flush,
.bdrv_co_flush = vpc_co_flush,
.bdrv_close = vpc_close,
.bdrv_create = vpc_create,