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block: Introduce bdrv_co_flush_to_os

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qcow2 has a writeback metadata cache, so flushing a qcow2 image actually
consists of writing back that cache to the protocol and only then flushes the
protocol in order to get everything stable on disk.

This introduces a separate bdrv_co_flush_to_os to reflect the split.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2011-11-10 18:10:11 +01:00
parent c68b89acd6
commit eb489bb1ec
3 changed files with 27 additions and 3 deletions
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13
block.c
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@ -2789,11 +2789,22 @@ static void coroutine_fn bdrv_flush_co_entry(void *opaque)
int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
{
int ret;
if (bs->open_flags & BDRV_O_NO_FLUSH) {
return 0;
} else if (!bs->drv) {
return 0;
} else if (bs->drv->bdrv_co_flush_to_disk) {
}
if (bs->drv->bdrv_co_flush_to_os) {
ret = bs->drv->bdrv_co_flush_to_os(bs);
if (ret < 0) {
return ret;
}
}
if (bs->drv->bdrv_co_flush_to_disk) {
return bs->drv->bdrv_co_flush_to_disk(bs);
} else if (bs->drv->bdrv_aio_flush) {
BlockDriverAIOCB *acb;