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;
return ret;
}
-static int qcow2_co_flush(BlockDriverState *bs)
+static int qcow2_co_flush_to_os(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
int ret;
}
qemu_co_mutex_unlock(&s->lock);
+ return 0;
+}
+
+static int qcow2_co_flush_to_disk(BlockDriverState *bs)
+{
return bdrv_co_flush(bs->file);
}
.bdrv_co_readv = qcow2_co_readv,
.bdrv_co_writev = qcow2_co_writev,
- .bdrv_co_flush_to_disk = qcow2_co_flush,
+ .bdrv_co_flush_to_os = qcow2_co_flush_to_os,
+ .bdrv_co_flush_to_disk = qcow2_co_flush_to_disk,
.bdrv_co_discard = qcow2_co_discard,
.bdrv_truncate = qcow2_truncate,
*/
int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs);
+ /*
+ * Flushes all internal caches to the OS. The data may still sit in a
+ * writeback cache of the host OS, but it will survive a crash of the qemu
+ * process.
+ */
+ int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs);
+
int (*bdrv_aio_multiwrite)(BlockDriverState *bs, BlockRequest *reqs,
int num_reqs);
int (*bdrv_merge_requests)(BlockDriverState *bs, BlockRequest* a,