[Qemu-devel] [PATCH v6 17/42] block: Use CAFs in bdrv_refresh_limits()

[Max Reitz]

Signed-off-by: Max Reitz <address@hidden>
Reviewed-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
 block/io.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/block/io.c b/block/io.c
index bcc770d336..dca4689b2f 100644
--- a/block/io.c
+++ b/block/io.c
@@ -135,6 +135,8 @@ static void bdrv_merge_limits(BlockLimits *dst, const 
BlockLimits *src)
 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
 {
     BlockDriver *drv = bs->drv;
+    BlockDriverState *storage_bs = bdrv_storage_bs(bs);
+    BlockDriverState *cow_bs = bdrv_filtered_cow_bs(bs);
     Error *local_err = NULL;
 
     memset(&bs->bl, 0, sizeof(bs->bl));
@@ -148,13 +150,13 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error 
**errp)
                                 drv->bdrv_aio_preadv) ? 1 : 512;
 
     /* Take some limits from the children as a default */
-    if (bs->file) {
-        bdrv_refresh_limits(bs->file->bs, &local_err);
+    if (storage_bs) {
+        bdrv_refresh_limits(storage_bs, &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
             return;
         }
-        bdrv_merge_limits(&bs->bl, &bs->file->bs->bl);
+        bdrv_merge_limits(&bs->bl, &storage_bs->bl);
     } else {
         bs->bl.min_mem_alignment = 512;
         bs->bl.opt_mem_alignment = getpagesize();
@@ -163,13 +165,13 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error 
**errp)
         bs->bl.max_iov = IOV_MAX;
     }
 
-    if (bs->backing) {
-        bdrv_refresh_limits(bs->backing->bs, &local_err);
+    if (cow_bs) {
+        bdrv_refresh_limits(cow_bs, &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
             return;
         }
-        bdrv_merge_limits(&bs->bl, &bs->backing->bs->bl);
+        bdrv_merge_limits(&bs->bl, &cow_bs->bl);
     }
 
     /* Then let the driver override it */
-- 
2.21.0