[Qemu-devel] [PATCHv3 16/20] block/get_block_status: avoid redundant callouts on raw devices

[Peter Lieven <pl@kamp.de>]

if a raw device like an iscsi target or host device is used
the current implementation makes a second call out to get
the block status of bs->file. however, the raw driver already
has called bdrv_get_block_status on bs->file.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Peter Lieven <pl@kamp.de>
---
 block.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block.c b/block.c
index 3bf1163..f56660d 100644
--- a/block.c
+++ b/block.c
@@ -3277,7 +3277,8 @@ static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs,
 
     if (bs->file &&
         (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) &&
-        (ret & BDRV_BLOCK_OFFSET_VALID)) {
+        (ret & BDRV_BLOCK_OFFSET_VALID) &&
+        strcmp(bs->drv->format_name, "raw")) {
         ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS,
                                         *pnum, pnum);
         if (ret2 >= 0) {
-- 
1.7.9.5