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savevm: teach qemu_fill_buffer to do partial refills

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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<quintela@redhat.com>
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Juan Quintela 2011-09-30 19:28:45 +02:00
parent cfce6d8934
commit 0046c45bc1
1 changed files with 11 additions and 3 deletions
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14
savevm.c
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@ -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);
if (len > 0) {
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 = len;
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_size += len;
f->buf_offset += len;
} else if (len != -EAGAIN)
f->has_error = 1;