[PATCH] Use qemu_memalign instead of qemu_malloc

[Anthony Liguori]

I guess the main block code is not as defensive as I thought it was.  This patch
uses qemu_memalign to allocate the buffers for IO so that you don't get errors
when using O_DIRECT.

It applies on top of my previous patch to introduce copies in virtio-blk.

Signed-off-by: Anthony Liguori <[EMAIL PROTECTED]>

diff --git a/qemu/hw/virtio-blk.c b/qemu/hw/virtio-blk.c
index 2ea5669..669e55f 100644
--- a/qemu/hw/virtio-blk.c
+++ b/qemu/hw/virtio-blk.c
@@ -174,7 +174,7 @@ static void virtio_blk_handle_output(VirtIODevice *vdev, 
VirtQueue *vq)
            for (i = 1; i < req->elem.out_num; i++)
                req->size += req->elem.out_sg[i].iov_len;
 
-           req->buffer = qemu_malloc(req->size);
+           req->buffer = qemu_memalign(512, req->size);
            if (req->buffer == NULL) {
                qemu_free(req);
                break;
@@ -203,7 +203,7 @@ static void virtio_blk_handle_output(VirtIODevice *vdev, 
VirtQueue *vq)
            for (i = 0; i < req->elem.in_num - 1; i++)
                req->size += req->elem.in_sg[i].iov_len;
 
-           req->buffer = qemu_malloc(req->size);
+           req->buffer = qemu_memalign(512, req->size);
            if (req->buffer == NULL) {
                qemu_free(req);
                break;
--
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