if the passed qiov contains exactly one iov we can pass the buffer directly.
Signed-off-by: Peter Lieven <p...@kamp.de> --- block/nfs.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/block/nfs.c b/block/nfs.c index ab5dcc2..bb4b75f 100644 --- a/block/nfs.c +++ b/block/nfs.c @@ -295,20 +295,27 @@ static int coroutine_fn nfs_co_pwritev(BlockDriverState *bs, uint64_t offset, NFSClient *client = bs->opaque; NFSRPC task; char *buf = NULL; + bool my_buffer = false; nfs_co_init_task(bs, &task); - buf = g_try_malloc(bytes); - if (bytes && buf == NULL) { - return -ENOMEM; + if (iov->niov != 1) { + buf = g_try_malloc(bytes); + if (bytes && buf == NULL) { + return -ENOMEM; + } + qemu_iovec_to_buf(iov, 0, buf, bytes); + my_buffer = true; + } else { + buf = iov->iov[0].iov_base; } - qemu_iovec_to_buf(iov, 0, buf, bytes); - if (nfs_pwrite_async(client->context, client->fh, offset, bytes, buf, nfs_co_generic_cb, &task) != 0) { - g_free(buf); + if (my_buffer) { + g_free(buf); + } return -ENOMEM; } @@ -317,7 +324,9 @@ static int coroutine_fn nfs_co_pwritev(BlockDriverState *bs, uint64_t offset, qemu_coroutine_yield(); } - g_free(buf); + if (my_buffer) { + g_free(buf); + } if (task.ret != bytes) { return task.ret < 0 ? task.ret : -EIO; -- 1.9.1