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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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8
block/vmdk.c
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@ -1494,14 +1494,14 @@ static void vmdk_close(BlockDriverState *bs)
vmdk_free_extents(bs);
}
static int vmdk_flush(BlockDriverState *bs)
static coroutine_fn int vmdk_co_flush(BlockDriverState *bs)
{
int i, ret, err;
BDRVVmdkState *s = bs->opaque;
ret = bdrv_flush(bs->file);
ret = bdrv_co_flush(bs->file);
for (i = 0; i < s->num_extents; i++) {
err = bdrv_flush(s->extents[i].file);
err = bdrv_co_flush(s->extents[i].file);
if (err < 0) {
ret = err;
}
@ -1568,7 +1568,7 @@ static BlockDriver bdrv_vmdk = {
.bdrv_write = vmdk_co_write,
.bdrv_close = vmdk_close,
.bdrv_create = vmdk_create,
.bdrv_flush = vmdk_flush,
.bdrv_co_flush = vmdk_co_flush,
.bdrv_is_allocated = vmdk_is_allocated,
.bdrv_get_allocated_file_size = vmdk_get_allocated_file_size,