block: rename bdrv_co_drain to bdrv_co_drain_begin

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Manos Pitsidianakis <el13635@mail.ntua.gr>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

block/io.c

@@ -165,7 +165,7 @@ static void coroutine_fn bdrv_drain_invoke_entry(void *opaque)
     BlockDriverState *bs = data->bs;
 
     if (data->begin) {
-        bs->drv->bdrv_co_drain(bs);
+        bs->drv->bdrv_co_drain_begin(bs);
     } else {
         bs->drv->bdrv_co_drain_end(bs);
     }
@@ -179,7 +179,7 @@ static void bdrv_drain_invoke(BlockDriverState *bs, bool begin)
 {
     BdrvCoDrainData data = { .bs = bs, .done = false, .begin = begin};
 
-    if (!bs->drv || (begin && !bs->drv->bdrv_co_drain) ||
+    if (!bs->drv || (begin && !bs->drv->bdrv_co_drain_begin) ||
             (!begin && !bs->drv->bdrv_co_drain_end)) {
         return;
     }

block/qed.c

@@ -265,7 +265,7 @@ static bool qed_plug_allocating_write_reqs(BDRVQEDState *s)
     assert(!s->allocating_write_reqs_plugged);
     if (s->allocating_acb != NULL) {
         /* Another allocating write came concurrently.  This cannot happen
-         * from bdrv_qed_co_drain, but it can happen when the timer runs.
+         * from bdrv_qed_co_drain_begin, but it can happen when the timer runs.
          */
         qemu_co_mutex_unlock(&s->table_lock);
         return false;
@@ -358,7 +358,7 @@ static void bdrv_qed_attach_aio_context(BlockDriverState *bs,
     }
 }
 
-static void coroutine_fn bdrv_qed_co_drain(BlockDriverState *bs)
+static void coroutine_fn bdrv_qed_co_drain_begin(BlockDriverState *bs)
 {
     BDRVQEDState *s = bs->opaque;
 
@@ -1608,7 +1608,7 @@ static BlockDriver bdrv_qed = {
     .bdrv_check               = bdrv_qed_check,
     .bdrv_detach_aio_context  = bdrv_qed_detach_aio_context,
     .bdrv_attach_aio_context  = bdrv_qed_attach_aio_context,
-    .bdrv_co_drain            = bdrv_qed_co_drain,
+    .bdrv_co_drain_begin      = bdrv_qed_co_drain_begin,
 };
 
 static void bdrv_qed_init(void)

include/block/block_int.h

@@ -354,7 +354,7 @@ struct BlockDriver {
     int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo);
 
     /**
-     * bdrv_co_drain is called if implemented in the beginning of a
+     * bdrv_co_drain_begin is called if implemented in the beginning of a
      * drain operation to drain and stop any internal sources of requests in
      * the driver.
      * bdrv_co_drain_end is called if implemented at the end of the drain.
@@ -363,7 +363,7 @@ struct BlockDriver {
      * requests, or toggle an internal state. After the end of the drain new
      * requests will continue normally.
      */
-    void coroutine_fn (*bdrv_co_drain)(BlockDriverState *bs);
+    void coroutine_fn (*bdrv_co_drain_begin)(BlockDriverState *bs);
     void coroutine_fn (*bdrv_co_drain_end)(BlockDriverState *bs);
 
     void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child,