block: Make blk_co_pwrite() take a const buffer

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>
Message-Id: <20220705161527.1054072-6-afaria@redhat.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>

diff --git a/include/sysemu/block-backend-io.h b/include/sysemu/block-backend-io.h
index 8bf1296105b3eac3a207769d4c68b405a5ff9bb0..b048476a471c2d257d9c373971881ecbae83685a 100644 (file)
--- a/include/sysemu/block-backend-io.h
+++ b/include/sysemu/block-backend-io.h
@@ -129,7 +129,7 @@ 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);