[Qemu-devel] [PATCH 1/4] savevm: teach qemu_fill_buffer to do partial refills

[Juan Quintela]

We will need on next patch to be able to lookahead on next patch

Signed-off-by: Juan Quintela <address@hidden>
---
 savevm.c |   14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/savevm.c b/savevm.c
index 46f2447..31131df 100644
--- a/savevm.c
+++ b/savevm.c
@@ -455,6 +455,7 @@ void qemu_fflush(QEMUFile *f)
 static void qemu_fill_buffer(QEMUFile *f)
 {
     int len;
+    int used;

     if (!f->get_buffer)
         return;
@@ -462,10 +463,17 @@ static void qemu_fill_buffer(QEMUFile *f)
     if (f->is_write)
         abort();

-    len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
+    used = f->buf_size - f->buf_index;
+    if (used > 0) {
+        memmove(f->buf, f->buf + f->buf_index, used);
+    }
+    f->buf_index = 0;
+    f->buf_size = used;
+
+    len = f->get_buffer(f->opaque, f->buf + used, f->buf_offset,
+                        IO_BUF_SIZE - used);
     if (len > 0) {
-        f->buf_index = 0;
-        f->buf_size = len;
+        f->buf_size += len;
         f->buf_offset += len;
     } else if (len != -EAGAIN)
         f->has_error = 1;
-- 
1.7.6.4