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[Qemu-devel] [PATCH 1/5] savevm: teach qemu_fill_buffer to do partial re
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PATCH 1/5] savevm: teach qemu_fill_buffer to do partial refills |
Date: |
Thu, 6 Oct 2011 18:21:36 +0200 |
We will need on next patch to be able to lookahead on next patch
v2: rename "used" to "pending" (Alex Williams)
Signed-off-by: Juan Quintela <address@hidden>
Reviewed-by: Anthony Liguori <address@hidden>
---
savevm.c | 14 +++++++++++---
1 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/savevm.c b/savevm.c
index 46f2447..743c304 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 pending;
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);
+ pending = f->buf_size - f->buf_index;
+ if (pending > 0) {
+ memmove(f->buf, f->buf + f->buf_index, pending);
+ }
+ f->buf_index = 0;
+ f->buf_size = pending;
+
+ len = f->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
+ IO_BUF_SIZE - pending);
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