From 724134432ef21f1fb2b18bbe55b891d31181ccca Mon Sep 17 00:00:00 2001
From: Jinhua Cao <caojinhua1@huawei.com>
Date: Fri, 11 Feb 2022 14:25:39 +0800
Subject: [PATCH] qemu-img: block: dont blk_make_zero if discard_zeroes false

Signed-off-by: Jinhua Cao <caojinhua1@huawei.com>
---
 block/file-posix.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/file-posix.c b/block/file-posix.c
index b283093e5b..aed7529f44 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -804,7 +804,7 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
     }
 #endif
 
-    bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK;
+    bs->supported_zero_flags = s->discard_zeroes ? (BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) : 0;
     if (S_ISREG(st.st_mode)) {
         /* When extending regular files, we get zeros from the OS */
         bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
-- 
2.27.0