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[Qemu-devel] [PATCH v5 5/7] Use writev ops if available
From: |
Orit Wasserman |
Subject: |
[Qemu-devel] [PATCH v5 5/7] Use writev ops if available |
Date: |
Fri, 22 Mar 2013 16:48:01 +0200 |
Update qemu_fflush and stdio_close to use writev ops if they are available
Use the buffers stored in the iovec.
Signed-off-by: Orit Wasserman <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>
---
savevm.c | 31 +++++++++++++++++++++++--------
1 file changed, 23 insertions(+), 8 deletions(-)
diff --git a/savevm.c b/savevm.c
index 8dad9ef..294434b 100644
--- a/savevm.c
+++ b/savevm.c
@@ -293,7 +293,7 @@ static int stdio_fclose(void *opaque)
QEMUFileStdio *s = opaque;
int ret = 0;
- if (s->file->ops->put_buffer) {
+ if (s->file->ops->put_buffer || s->file->ops->writev_buffer) {
int fd = fileno(s->stdio_file);
struct stat st;
@@ -516,20 +516,35 @@ static void qemu_file_set_error(QEMUFile *f, int ret)
}
}
-/** Flushes QEMUFile buffer
+/**
+ * Flushes QEMUFile buffer
*
+ * If there is writev_buffer QEMUFileOps it uses it otherwise uses
+ * put_buffer ops.
*/
static void qemu_fflush(QEMUFile *f)
{
- int ret = 0;
+ ssize_t ret = 0;
+ int i = 0;
- if (!f->ops->put_buffer) {
+ if (!f->ops->writev_buffer && !f->ops->put_buffer) {
return;
}
- if (f->is_write && f->buf_index > 0) {
- ret = f->ops->put_buffer(f->opaque, f->buf, f->pos, f->buf_index);
- if (ret >= 0) {
- f->pos += f->buf_index;
+
+ if (f->is_write && f->iovcnt > 0) {
+ if (f->ops->writev_buffer) {
+ ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt);
+ if (ret >= 0) {
+ f->pos += ret;
+ }
+ } else {
+ for (i = 0; i < f->iovcnt && ret >= 0; i++) {
+ ret = f->ops->put_buffer(f->opaque, f->iov[i].iov_base, f->pos,
+ f->iov[i].iov_len);
+ if (ret >= 0) {
+ f->pos += ret;
+ }
+ }
}
f->buf_index = 0;
f->iovcnt = 0;
--
1.7.11.7
- [Qemu-devel] [PATCH v5 0/7] Migration: Remove copying of guest ram pages, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 1/7] Add QemuFileWritevBuffer QemuFileOps, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 2/7] Add socket_writev_buffer function, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 3/7] Update bytes_xfer in qemu_put_byte, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 4/7] Store the data to send also in iovec, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 5/7] Use writev ops if available,
Orit Wasserman <=
- [Qemu-devel] [PATCH v5 6/7] Add qemu_put_buffer_async, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 7/7] Use qemu_put_buffer_async for guest memory pages, Orit Wasserman, 2013/03/22
- Re: [Qemu-devel] [PATCH v5 0/7] Migration: Remove copying of guest ram pages, Eric Blake, 2013/03/27