block: move BQL logic of bdrv_co_invalidate_cache in bdrv_activate

Split bdrv_co_invalidate cache in two: the Global State (under BQL)
code that takes care of permissions and running GS callbacks,
and leave only the I/O code (->bdrv_co_invalidate_cache) running in
the I/O coroutine.

The only side effect is that bdrv_co_invalidate_cache is not
recursive anymore, and so is every direct call to
bdrv_invalidate_cache().

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20220209105452.1694545-6-eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 23 insertions, 14 deletions

diff --git a/block.c b/block.c
index 5e65f13..df353d5 100644
--- a/block.c
+++ b/block.c
@@ -6395,11 +6395,6 @@ void bdrv_init_with_whitelist(void)
 
 int bdrv_activate(BlockDriverState *bs, Error **errp)
 {
-    return bdrv_invalidate_cache(bs, errp);
-}
-
-int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp)
-{
     BdrvChild *child, *parent;
     Error *local_err = NULL;
     int ret;
@@ -6410,7 +6405,7 @@ int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp)
     }
 
     QLIST_FOREACH(child, &bs->children, next) {
-        bdrv_co_invalidate_cache(child->bs, &local_err);
+        bdrv_activate(child->bs, &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
             return -EINVAL;
@@ -6423,7 +6418,7 @@ int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp)
      * Note that the required permissions of inactive images are always a
      * subset of the permissions required after activating the image. This
      * allows us to just get the permissions upfront without restricting
-     * drv->bdrv_invalidate_cache().
+     * bdrv_co_invalidate_cache().
      *
      * It also means that in error cases, we don't have to try and revert to
      * the old permissions (which is an operation that could fail, too). We can
@@ -6438,13 +6433,10 @@ int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp)
             return ret;
         }
 
-        if (bs->drv->bdrv_co_invalidate_cache) {
-            bs->drv->bdrv_co_invalidate_cache(bs, &local_err);
-            if (local_err) {
-                bs->open_flags |= BDRV_O_INACTIVE;
-                error_propagate(errp, local_err);
-                return -EINVAL;
-            }
+        ret = bdrv_invalidate_cache(bs, errp);
+        if (ret < 0) {
+            bs->open_flags |= BDRV_O_INACTIVE;
+            return ret;
         }
 
         FOR_EACH_DIRTY_BITMAP(bs, bm) {
@@ -6473,6 +6465,23 @@ int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp)
     return 0;
 }
 
+int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp)
+{
+    Error *local_err = NULL;
+
+    assert(!(bs->open_flags & BDRV_O_INACTIVE));
+
+    if (bs->drv->bdrv_co_invalidate_cache) {
+        bs->drv->bdrv_co_invalidate_cache(bs, &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
+            return -EINVAL;
+        }
+    }
+
+    return 0;
+}
+
 void bdrv_activate_all(Error **errp)
 {
     BlockDriverState *bs;