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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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11
block/qcow.c
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@ -781,10 +781,9 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque)
static coroutine_fn int qcow_co_flush(BlockDriverState *bs)
{
return bdrv_aio_flush(bs->file, cb, opaque);
return bdrv_co_flush(bs->file);
}
static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
@ -824,9 +823,9 @@ static BlockDriver bdrv_qcow = {
.bdrv_is_allocated = qcow_is_allocated,
.bdrv_set_key = qcow_set_key,
.bdrv_make_empty = qcow_make_empty,
.bdrv_co_readv = qcow_co_readv,
.bdrv_co_writev = qcow_co_writev,
.bdrv_aio_flush = qcow_aio_flush,
.bdrv_co_readv = qcow_co_readv,
.bdrv_co_writev = qcow_co_writev,
.bdrv_co_flush = qcow_co_flush,
.bdrv_write_compressed = qcow_write_compressed,
.bdrv_get_info = qcow_get_info,