migration: remove the QEMUFileOps 'writev_buffer' callback

This directly implements the writev_buffer logic using QIOChannel APIs.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

1 files changed, 8 insertions, 16 deletions

diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 2f46873efd..355117fee0 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -248,10 +248,6 @@ static void qemu_iovec_release_ram(QEMUFile *f)
  */
 void qemu_fflush(QEMUFile *f)
 {
-    ssize_t ret = 0;
-    ssize_t expect = 0;
-    Error *local_error = NULL;
-
     if (!qemu_file_is_writable(f)) {
         return;
     }
@@ -260,22 +256,18 @@ void qemu_fflush(QEMUFile *f)
         return;
     }
     if (f->iovcnt > 0) {
-        expect = iov_size(f->iov, f->iovcnt);
-        ret = f->ops->writev_buffer(f->ioc, f->iov, f->iovcnt,
-                                    f->total_transferred, &local_error);
+        Error *local_error = NULL;
+        if (qio_channel_writev_all(f->ioc,
+                                   f->iov, f->iovcnt,
+                                   &local_error) < 0) {
+            qemu_file_set_error_obj(f, -EIO, local_error);
+        } else {
+            f->total_transferred += iov_size(f->iov, f->iovcnt);
+        }
 
         qemu_iovec_release_ram(f);
     }
 
-    if (ret >= 0) {
-        f->total_transferred += ret;
-    }
-    /* We expect the QEMUFile write impl to send the full
-     * data set we requested, so sanity check that.
-     */
-    if (ret != expect) {
-        qemu_file_set_error_obj(f, ret < 0 ? ret : -EIO, local_error);
-    }
     f->buf_index = 0;
     f->iovcnt = 0;
 }