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[Qemu-devel] [PATCH 2/4] block/null-{co, aio}: Return zeros when read
From: |
Max Reitz |
Subject: |
[Qemu-devel] [PATCH 2/4] block/null-{co, aio}: Return zeros when read |
Date: |
Sat, 20 Feb 2016 18:39:51 +0100 |
Currently, we do not define exactly what is returned when read, but
having a reliable source of zeros is always nice.
Signed-off-by: Max Reitz <address@hidden>
---
block/null.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/block/null.c b/block/null.c
index d90165d..ad883d9 100644
--- a/block/null.c
+++ b/block/null.c
@@ -90,6 +90,7 @@ static coroutine_fn int null_co_readv(BlockDriverState *bs,
int64_t sector_num, int nb_sectors,
QEMUIOVector *qiov)
{
+ qemu_iovec_memset(qiov, 0, 0, nb_sectors * BDRV_SECTOR_SIZE);
return null_co_common(bs);
}
@@ -159,6 +160,7 @@ static BlockAIOCB *null_aio_readv(BlockDriverState *bs,
BlockCompletionFunc *cb,
void *opaque)
{
+ qemu_iovec_memset(qiov, 0, 0, nb_sectors * BDRV_SECTOR_SIZE);
return null_aio_common(bs, cb, opaque);
}
--
2.7.1