block: use coroutine interface for raw format

The raw format delegates all operations to bs->file (the protocol).
Previously this block driver exposed both sync and aio interfaces.
Since the block layer now works in terms of coroutines, expose the
coroutine interfaces and drop the others.  This avoids unnecessary
emulation of sync and aio interfaces.
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

block/raw.c

@@ -9,30 +9,16 @@ static int raw_open(BlockDriverState *bs, int flags)
     return 0;
 }
 
-static int raw_read(BlockDriverState *bs, int64_t sector_num,
-                    uint8_t *buf, int nb_sectors)
+static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num,
+                                     int nb_sectors, QEMUIOVector *qiov)
 {
-    return bdrv_read(bs->file, sector_num, buf, nb_sectors);
+    return bdrv_co_readv(bs->file, sector_num, nb_sectors, qiov);
 }
 
-static int raw_write(BlockDriverState *bs, int64_t sector_num,
-                     const uint8_t *buf, int nb_sectors)
+static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,
+                                      int nb_sectors, QEMUIOVector *qiov)
 {
-    return bdrv_write(bs->file, sector_num, buf, nb_sectors);
-}
-
-static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
-    int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
-    BlockDriverCompletionFunc *cb, void *opaque)
-{
-    return bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
-}
-
-static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
-    int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
-    BlockDriverCompletionFunc *cb, void *opaque)
-{
-    return bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
+    return bdrv_co_writev(bs->file, sector_num, nb_sectors, qiov);
 }
 
 static void raw_close(BlockDriverState *bs)
@@ -129,15 +115,13 @@ static BlockDriver bdrv_raw = {
 
     .bdrv_open          = raw_open,
     .bdrv_close         = raw_close,
-    .bdrv_read          = raw_read,
-    .bdrv_write         = raw_write,
+    .bdrv_co_readv      = raw_co_readv,
+    .bdrv_co_writev     = raw_co_writev,
     .bdrv_flush         = raw_flush,
     .bdrv_probe         = raw_probe,
     .bdrv_getlength     = raw_getlength,
     .bdrv_truncate      = raw_truncate,
 
-    .bdrv_aio_readv     = raw_aio_readv,
-    .bdrv_aio_writev    = raw_aio_writev,
     .bdrv_aio_flush     = raw_aio_flush,
     .bdrv_discard       = raw_discard,