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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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4
block/rbd.c
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@ -705,7 +705,7 @@ static BlockDriverAIOCB *qemu_rbd_aio_writev(BlockDriverState *bs,
return rbd_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
}
static int qemu_rbd_flush(BlockDriverState *bs)
static int qemu_rbd_co_flush(BlockDriverState *bs)
{
#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(0, 1, 1)
/* rbd_flush added in 0.1.1 */
@ -851,7 +851,7 @@ static BlockDriver bdrv_rbd = {
.bdrv_file_open = qemu_rbd_open,
.bdrv_close = qemu_rbd_close,
.bdrv_create = qemu_rbd_create,
.bdrv_flush = qemu_rbd_flush,
.bdrv_co_flush = qemu_rbd_co_flush,
.bdrv_get_info = qemu_rbd_getinfo,
.create_options = qemu_rbd_create_options,
.bdrv_getlength = qemu_rbd_getlength,