[PATCH 09/10] Scrub buffers involved in guest block I/O

[Aruna Balakrishnaiah]

vhost_scsi instance will be attached to the file's private data.
To get to the right file check the fdtable for each task, if the file
has registered its fops with vhost_net_open, if so we can retreive the
file's private data.

if (task->files->fdt->fd[i]->f_op->open == &vhost_scsi_open)
	vhost_scsi *vs = task->files->fdt->fd[i]->private_data;

struct vhost_virtqueue *vq = (struct vhost_virtqueue *)vs->vqs[i].vq;
scrub vq->iov[j].iov_base

Signed-off-by: Aruna Balakrishnaiah <aruna at linux.vnet.ibm.com>
---
 eppic_scripts/vhost_scsi_buffers.c |   71 ++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 eppic_scripts/vhost_scsi_buffers.c

diff --git a/eppic_scripts/vhost_scsi_buffers.c b/eppic_scripts/vhost_scsi_buffers.c
new file mode 100644
index 0000000..caa4982
--- /dev/null
+++ b/eppic_scripts/vhost_scsi_buffers.c
@@ -0,0 +1,71 @@
+string
+vhost_opt()
+{
+	    return "l";
+}
+
+string
+vhost_usage()
+{
+	    return "\n";
+}
+
+static void
+vhost_showusage()
+{
+	    printf("usage : vhost %s", vhost_usage());
+}
+
+string
+vhost_help()
+{
+	    return "Help";
+}
+
+void
+vhost_scsi(struct vhost_scsi *vs)
+{
+	if (vs == NULL)
+		return;
+
+	for (i = 0; i < 128; i++) {
+		struct vhost_virtqueue *vq = (struct vhost_virtqueue *)vs->vqs[i].vq;
+
+		for (j = 0; j < 1024; j++)
+		      memset((char *)vq->iov[j].iov_base, 'L', vq->iov[j].iov_len);
+		      memset((char *)&(vq->iov[j].iov_len), 'L', 0x8);
+	}
+}
+
+int
+vhost()
+{
+	struct list_head *head, *next;
+	struct task_struct *tsk;
+
+	tsk = &init_task;
+
+	head = (struct list_head *) &(tsk->tasks);
+	next = (struct list_head *) tsk->tasks.next;
+
+	while (next != head)
+	{
+		int i;
+		struct task_struct *task, *off = 0;
+
+		task = (struct task_struct *)((unsigned long)next - ((unsigned long)&(off->tasks)));
+
+		if (task->files && task->files->fdt) {
+			for (i = 0; i < task->files->fdt->max_fds; i++) {
+				if (task->files->fdt->fd[i] && task->files->fdt->fd[i]->f_op
+					&& task->files->fdt->fd[i]->f_op->open == &vhost_scsi_open)
+					vhost_scsi((struct vhost_scsi *)task->files->fdt->fd[i]->private_data);
+			}
+		}
+
+
+		next = (struct list_head *)task->tasks.next;
+	}
+
+	return 1;
+}