It does not mutate the buffer.

Signed-off-by: Alberto Faria <afaria@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
---
 include/sysemu/block-backend-io.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/sysemu/block-backend-io.h b/include/sysemu/block-backend-io.h
index 6630316795..6440e92028 100644
--- a/include/sysemu/block-backend-io.h
+++ b/include/sysemu/block-backend-io.h
@@ -130,7 +130,7 @@ static inline int coroutine_fn blk_co_pread(BlockBackend *blk, int64_t offset,
 }
 
 static inline int coroutine_fn blk_co_pwrite(BlockBackend *blk, int64_t offset,
-                                             int64_t bytes, void *buf,
+                                             int64_t bytes, const void *buf,
                                              BdrvRequestFlags flags)
 {
     QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
-- 
2.36.1