vhost: src file renames

Move tcm_vhost.c -> scsi.c

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Asias He <asias@redhat.com>
Acked-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 0 insertions, 2046 deletions

diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
deleted file mode 100644
index 19ca021..0000000
--- a/drivers/vhost/tcm_vhost.c
+++ /dev/null
@@ -1,2046 +0,0 @@
-/*******************************************************************************
- * Vhost kernel TCM fabric driver for virtio SCSI initiators
- *
- * (C) Copyright 2010-2012 RisingTide Systems LLC.
- * (C) Copyright 2010-2012 IBM Corp.
- *
- * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
- *
- * Authors: Nicholas A. Bellinger <nab@risingtidesystems.com>
- *          Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- ****************************************************************************/
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <generated/utsrelease.h>
-#include <linux/utsname.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/kthread.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/configfs.h>
-#include <linux/ctype.h>
-#include <linux/compat.h>
-#include <linux/eventfd.h>
-#include <linux/fs.h>
-#include <linux/miscdevice.h>
-#include <asm/unaligned.h>
-#include <scsi/scsi.h>
-#include <scsi/scsi_tcq.h>
-#include <target/target_core_base.h>
-#include <target/target_core_fabric.h>
-#include <target/target_core_fabric_configfs.h>
-#include <target/target_core_configfs.h>
-#include <target/configfs_macros.h>
-#include <linux/vhost.h>
-#include <linux/virtio_scsi.h>
-#include <linux/llist.h>
-#include <linux/bitmap.h>
-
-#include "vhost.c"
-#include "vhost.h"
-#include "tcm_vhost.h"
-
-enum {
-	VHOST_SCSI_VQ_CTL = 0,
-	VHOST_SCSI_VQ_EVT = 1,
-	VHOST_SCSI_VQ_IO = 2,
-};
-
-/*
- * VIRTIO_RING_F_EVENT_IDX seems broken. Not sure the bug is in
- * kernel but disabling it helps.
- * TODO: debug and remove the workaround.
- */
-enum {
-	VHOST_SCSI_FEATURES = (VHOST_FEATURES & (~VIRTIO_RING_F_EVENT_IDX)) |
-			      (1ULL << VIRTIO_SCSI_F_HOTPLUG)
-};
-
-#define VHOST_SCSI_MAX_TARGET	256
-#define VHOST_SCSI_MAX_VQ	128
-#define VHOST_SCSI_MAX_EVENT	128
-
-struct vhost_scsi_inflight {
-	/* Wait for the flush operation to finish */
-	struct completion comp;
-	/* Refcount for the inflight reqs */
-	struct kref kref;
-};
-
-struct vhost_scsi_virtqueue {
-	struct vhost_virtqueue vq;
-	/*
-	 * Reference counting for inflight reqs, used for flush operation. At
-	 * each time, one reference tracks new commands submitted, while we
-	 * wait for another one to reach 0.
-	 */
-	struct vhost_scsi_inflight inflights[2];
-	/*
-	 * Indicate current inflight in use, protected by vq->mutex.
-	 * Writers must also take dev mutex and flush under it.
-	 */
-	int inflight_idx;
-};
-
-struct vhost_scsi {
-	/* Protected by vhost_scsi->dev.mutex */
-	struct tcm_vhost_tpg **vs_tpg;
-	char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
-
-	struct vhost_dev dev;
-	struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
-
-	struct vhost_work vs_completion_work; /* cmd completion work item */
-	struct llist_head vs_completion_list; /* cmd completion queue */
-
-	struct vhost_work vs_event_work; /* evt injection work item */
-	struct llist_head vs_event_list; /* evt injection queue */
-
-	bool vs_events_missed; /* any missed events, protected by vq->mutex */
-	int vs_events_nr; /* num of pending events, protected by vq->mutex */
-};
-
-/* Local pointer to allocated TCM configfs fabric module */
-static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
-
-static struct workqueue_struct *tcm_vhost_workqueue;
-
-/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
-static DEFINE_MUTEX(tcm_vhost_mutex);
-static LIST_HEAD(tcm_vhost_list);
-
-static int iov_num_pages(struct iovec *iov)
-{
-	return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) -
-	       ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
-}
-
-void tcm_vhost_done_inflight(struct kref *kref)
-{
-	struct vhost_scsi_inflight *inflight;
-
-	inflight = container_of(kref, struct vhost_scsi_inflight, kref);
-	complete(&inflight->comp);
-}
-
-static void tcm_vhost_init_inflight(struct vhost_scsi *vs,
-				    struct vhost_scsi_inflight *old_inflight[])
-{
-	struct vhost_scsi_inflight *new_inflight;
-	struct vhost_virtqueue *vq;
-	int idx, i;
-
-	for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
-		vq = &vs->vqs[i].vq;
-
-		mutex_lock(&vq->mutex);
-
-		/* store old infight */
-		idx = vs->vqs[i].inflight_idx;
-		if (old_inflight)
-			old_inflight[i] = &vs->vqs[i].inflights[idx];
-
-		/* setup new infight */
-		vs->vqs[i].inflight_idx = idx ^ 1;
-		new_inflight = &vs->vqs[i].inflights[idx ^ 1];
-		kref_init(&new_inflight->kref);
-		init_completion(&new_inflight->comp);
-
-		mutex_unlock(&vq->mutex);
-	}
-}
-
-static struct vhost_scsi_inflight *
-tcm_vhost_get_inflight(struct vhost_virtqueue *vq)
-{
-	struct vhost_scsi_inflight *inflight;
-	struct vhost_scsi_virtqueue *svq;
-
-	svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
-	inflight = &svq->inflights[svq->inflight_idx];
-	kref_get(&inflight->kref);
-
-	return inflight;
-}
-
-static void tcm_vhost_put_inflight(struct vhost_scsi_inflight *inflight)
-{
-	kref_put(&inflight->kref, tcm_vhost_done_inflight);
-}
-
-static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
-{
-	return 1;
-}
-
-static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
-{
-	return 0;
-}
-
-static char *tcm_vhost_get_fabric_name(void)
-{
-	return "vhost";
-}
-
-static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
-{
-	struct tcm_vhost_tpg *tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-	struct tcm_vhost_tport *tport = tpg->tport;
-
-	switch (tport->tport_proto_id) {
-	case SCSI_PROTOCOL_SAS:
-		return sas_get_fabric_proto_ident(se_tpg);
-	case SCSI_PROTOCOL_FCP:
-		return fc_get_fabric_proto_ident(se_tpg);
-	case SCSI_PROTOCOL_ISCSI:
-		return iscsi_get_fabric_proto_ident(se_tpg);
-	default:
-		pr_err("Unknown tport_proto_id: 0x%02x, using"
-			" SAS emulation\n", tport->tport_proto_id);
-		break;
-	}
-
-	return sas_get_fabric_proto_ident(se_tpg);
-}
-
-static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
-{
-	struct tcm_vhost_tpg *tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-	struct tcm_vhost_tport *tport = tpg->tport;
-
-	return &tport->tport_name[0];
-}
-
-static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
-{
-	struct tcm_vhost_tpg *tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-	return tpg->tport_tpgt;
-}
-
-static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
-{
-	return 1;
-}
-
-static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
-	struct se_node_acl *se_nacl,
-	struct t10_pr_registration *pr_reg,
-	int *format_code,
-	unsigned char *buf)
-{
-	struct tcm_vhost_tpg *tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-	struct tcm_vhost_tport *tport = tpg->tport;
-
-	switch (tport->tport_proto_id) {
-	case SCSI_PROTOCOL_SAS:
-		return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
-					format_code, buf);
-	case SCSI_PROTOCOL_FCP:
-		return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
-					format_code, buf);
-	case SCSI_PROTOCOL_ISCSI:
-		return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
-					format_code, buf);
-	default:
-		pr_err("Unknown tport_proto_id: 0x%02x, using"
-			" SAS emulation\n", tport->tport_proto_id);
-		break;
-	}
-
-	return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
-			format_code, buf);
-}
-
-static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
-	struct se_node_acl *se_nacl,
-	struct t10_pr_registration *pr_reg,
-	int *format_code)
-{
-	struct tcm_vhost_tpg *tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-	struct tcm_vhost_tport *tport = tpg->tport;
-
-	switch (tport->tport_proto_id) {
-	case SCSI_PROTOCOL_SAS:
-		return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
-					format_code);
-	case SCSI_PROTOCOL_FCP:
-		return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
-					format_code);
-	case SCSI_PROTOCOL_ISCSI:
-		return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
-					format_code);
-	default:
-		pr_err("Unknown tport_proto_id: 0x%02x, using"
-			" SAS emulation\n", tport->tport_proto_id);
-		break;
-	}
-
-	return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
-			format_code);
-}
-
-static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
-	const char *buf,
-	u32 *out_tid_len,
-	char **port_nexus_ptr)
-{
-	struct tcm_vhost_tpg *tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-	struct tcm_vhost_tport *tport = tpg->tport;
-
-	switch (tport->tport_proto_id) {
-	case SCSI_PROTOCOL_SAS:
-		return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
-					port_nexus_ptr);
-	case SCSI_PROTOCOL_FCP:
-		return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
-					port_nexus_ptr);
-	case SCSI_PROTOCOL_ISCSI:
-		return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
-					port_nexus_ptr);
-	default:
-		pr_err("Unknown tport_proto_id: 0x%02x, using"
-			" SAS emulation\n", tport->tport_proto_id);
-		break;
-	}
-
-	return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
-			port_nexus_ptr);
-}
-
-static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
-	struct se_portal_group *se_tpg)
-{
-	struct tcm_vhost_nacl *nacl;
-
-	nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
-	if (!nacl) {
-		pr_err("Unable to allocate struct tcm_vhost_nacl\n");
-		return NULL;
-	}
-
-	return &nacl->se_node_acl;
-}
-
-static void tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
-	struct se_node_acl *se_nacl)
-{
-	struct tcm_vhost_nacl *nacl = container_of(se_nacl,
-			struct tcm_vhost_nacl, se_node_acl);
-	kfree(nacl);
-}
-
-static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
-{
-	return 1;
-}
-
-static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
-{
-	return;
-}
-
-static int tcm_vhost_shutdown_session(struct se_session *se_sess)
-{
-	return 0;
-}
-
-static void tcm_vhost_close_session(struct se_session *se_sess)
-{
-	return;
-}
-
-static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
-{
-	return 0;
-}
-
-static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
-{
-	/* Go ahead and process the write immediately */
-	target_execute_cmd(se_cmd);
-	return 0;
-}
-
-static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
-{
-	return 0;
-}
-
-static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
-{
-	return;
-}
-
-static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
-{
-	return 0;
-}
-
-static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
-{
-	return 0;
-}
-
-static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
-{
-	struct vhost_scsi *vs = tv_cmd->tvc_vhost;
-
-	llist_add(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
-
-	vhost_work_queue(&vs->dev, &vs->vs_completion_work);
-}
-
-static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
-{
-	struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
-				struct tcm_vhost_cmd, tvc_se_cmd);
-	vhost_scsi_complete_cmd(tv_cmd);
-	return 0;
-}
-
-static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
-{
-	struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
-				struct tcm_vhost_cmd, tvc_se_cmd);
-	vhost_scsi_complete_cmd(tv_cmd);
-	return 0;
-}
-
-static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
-{
-	return 0;
-}
-
-static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
-{
-	vs->vs_events_nr--;
-	kfree(evt);
-}
-
-static struct tcm_vhost_evt *tcm_vhost_allocate_evt(struct vhost_scsi *vs,
-	u32 event, u32 reason)
-{
-	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
-	struct tcm_vhost_evt *evt;
-
-	if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
-		vs->vs_events_missed = true;
-		return NULL;
-	}
-
-	evt = kzalloc(sizeof(*evt), GFP_KERNEL);
-	if (!evt) {
-		vq_err(vq, "Failed to allocate tcm_vhost_evt\n");
-		vs->vs_events_missed = true;
-		return NULL;
-	}
-
-	evt->event.event = event;
-	evt->event.reason = reason;
-	vs->vs_events_nr++;
-
-	return evt;
-}
-
-static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
-{
-	struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
-
-	/* TODO locking against target/backend threads? */
-	transport_generic_free_cmd(se_cmd, 1);
-
-	if (tv_cmd->tvc_sgl_count) {
-		u32 i;
-		for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
-			put_page(sg_page(&tv_cmd->tvc_sgl[i]));
-
-		kfree(tv_cmd->tvc_sgl);
-	}
-
-	tcm_vhost_put_inflight(tv_cmd->inflight);
-
-	kfree(tv_cmd);
-}
-
-static void tcm_vhost_do_evt_work(struct vhost_scsi *vs,
-	struct tcm_vhost_evt *evt)
-{
-	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
-	struct virtio_scsi_event *event = &evt->event;
-	struct virtio_scsi_event __user *eventp;
-	unsigned out, in;
-	int head, ret;
-
-	if (!vq->private_data) {
-		vs->vs_events_missed = true;
-		return;
-	}
-
-again:
-	vhost_disable_notify(&vs->dev, vq);
-	head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
-			ARRAY_SIZE(vq->iov), &out, &in,
-			NULL, NULL);
-	if (head < 0) {
-		vs->vs_events_missed = true;
-		return;
-	}
-	if (head == vq->num) {
-		if (vhost_enable_notify(&vs->dev, vq))
-			goto again;
-		vs->vs_events_missed = true;
-		return;
-	}
-
-	if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
-		vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
-				vq->iov[out].iov_len);
-		vs->vs_events_missed = true;
-		return;
-	}
-
-	if (vs->vs_events_missed) {
-		event->event |= VIRTIO_SCSI_T_EVENTS_MISSED;
-		vs->vs_events_missed = false;
-	}
-
-	eventp = vq->iov[out].iov_base;
-	ret = __copy_to_user(eventp, event, sizeof(*event));
-	if (!ret)
-		vhost_add_used_and_signal(&vs->dev, vq, head, 0);
-	else
-		vq_err(vq, "Faulted on tcm_vhost_send_event\n");
-}
-
-static void tcm_vhost_evt_work(struct vhost_work *work)
-{
-	struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
-					vs_event_work);
-	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
-	struct tcm_vhost_evt *evt;
-	struct llist_node *llnode;
-
-	mutex_lock(&vq->mutex);
-	llnode = llist_del_all(&vs->vs_event_list);
-	while (llnode) {
-		evt = llist_entry(llnode, struct tcm_vhost_evt, list);
-		llnode = llist_next(llnode);
-		tcm_vhost_do_evt_work(vs, evt);
-		tcm_vhost_free_evt(vs, evt);
-	}
-	mutex_unlock(&vq->mutex);
-}
-
-/* Fill in status and signal that we are done processing this command
- *
- * This is scheduled in the vhost work queue so we are called with the owner
- * process mm and can access the vring.
- */
-static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
-{
-	struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
-					vs_completion_work);
-	DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
-	struct virtio_scsi_cmd_resp v_rsp;
-	struct tcm_vhost_cmd *tv_cmd;
-	struct llist_node *llnode;
-	struct se_cmd *se_cmd;
-	int ret, vq;
-
-	bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
-	llnode = llist_del_all(&vs->vs_completion_list);
-	while (llnode) {
-		tv_cmd = llist_entry(llnode, struct tcm_vhost_cmd,
-				     tvc_completion_list);
-		llnode = llist_next(llnode);
-		se_cmd = &tv_cmd->tvc_se_cmd;
-
-		pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
-			tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
-
-		memset(&v_rsp, 0, sizeof(v_rsp));
-		v_rsp.resid = se_cmd->residual_count;
-		/* TODO is status_qualifier field needed? */
-		v_rsp.status = se_cmd->scsi_status;
-		v_rsp.sense_len = se_cmd->scsi_sense_length;
-		memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
-		       v_rsp.sense_len);
-		ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
-		if (likely(ret == 0)) {
-			struct vhost_scsi_virtqueue *q;
-			vhost_add_used(tv_cmd->tvc_vq, tv_cmd->tvc_vq_desc, 0);
-			q = container_of(tv_cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
-			vq = q - vs->vqs;
-			__set_bit(vq, signal);
-		} else
-			pr_err("Faulted on virtio_scsi_cmd_resp\n");
-
-		vhost_scsi_free_cmd(tv_cmd);
-	}
-
-	vq = -1;
-	while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
-		< VHOST_SCSI_MAX_VQ)
-		vhost_signal(&vs->dev, &vs->vqs[vq].vq);
-}
-
-static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
-	struct vhost_virtqueue *vq,
-	struct tcm_vhost_tpg *tv_tpg,
-	struct virtio_scsi_cmd_req *v_req,
-	u32 exp_data_len,
-	int data_direction)
-{
-	struct tcm_vhost_cmd *tv_cmd;
-	struct tcm_vhost_nexus *tv_nexus;
-
-	tv_nexus = tv_tpg->tpg_nexus;
-	if (!tv_nexus) {
-		pr_err("Unable to locate active struct tcm_vhost_nexus\n");
-		return ERR_PTR(-EIO);
-	}
-
-	tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
-	if (!tv_cmd) {
-		pr_err("Unable to allocate struct tcm_vhost_cmd\n");
-		return ERR_PTR(-ENOMEM);
-	}
-	tv_cmd->tvc_tag = v_req->tag;
-	tv_cmd->tvc_task_attr = v_req->task_attr;
-	tv_cmd->tvc_exp_data_len = exp_data_len;
-	tv_cmd->tvc_data_direction = data_direction;
-	tv_cmd->tvc_nexus = tv_nexus;
-	tv_cmd->inflight = tcm_vhost_get_inflight(vq);
-
-	return tv_cmd;
-}
-
-/*
- * Map a user memory range into a scatterlist
- *
- * Returns the number of scatterlist entries used or -errno on error.
- */
-static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
-	unsigned int sgl_count, struct iovec *iov, int write)
-{
-	unsigned int npages = 0, pages_nr, offset, nbytes;
-	struct scatterlist *sg = sgl;
-	void __user *ptr = iov->iov_base;
-	size_t len = iov->iov_len;
-	struct page **pages;
-	int ret, i;
-
-	pages_nr = iov_num_pages(iov);
-	if (pages_nr > sgl_count)
-		return -ENOBUFS;
-
-	pages = kmalloc(pages_nr * sizeof(struct page *), GFP_KERNEL);
-	if (!pages)
-		return -ENOMEM;
-
-	ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
-	/* No pages were pinned */
-	if (ret < 0)
-		goto out;
-	/* Less pages pinned than wanted */
-	if (ret != pages_nr) {
-		for (i = 0; i < ret; i++)
-			put_page(pages[i]);
-		ret = -EFAULT;
-		goto out;
-	}
-
-	while (len > 0) {
-		offset = (uintptr_t)ptr & ~PAGE_MASK;
-		nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
-		sg_set_page(sg, pages[npages], nbytes, offset);
-		ptr += nbytes;
-		len -= nbytes;
-		sg++;
-		npages++;
-	}
-
-out:
-	kfree(pages);
-	return ret;
-}
-
-static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
-	struct iovec *iov, unsigned int niov, int write)
-{
-	int ret;
-	unsigned int i;
-	u32 sgl_count;
-	struct scatterlist *sg;
-
-	/*
-	 * Find out how long sglist needs to be
-	 */
-	sgl_count = 0;
-	for (i = 0; i < niov; i++)
-		sgl_count += iov_num_pages(&iov[i]);
-
-	/* TODO overflow checking */
-
-	sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
-	if (!sg)
-		return -ENOMEM;
-	pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__,
-	       sg, sgl_count, !sg);
-	sg_init_table(sg, sgl_count);
-
-	tv_cmd->tvc_sgl = sg;
-	tv_cmd->tvc_sgl_count = sgl_count;
-
-	pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
-	for (i = 0; i < niov; i++) {
-		ret = vhost_scsi_map_to_sgl(sg, sgl_count, &iov[i], write);
-		if (ret < 0) {
-			for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
-				put_page(sg_page(&tv_cmd->tvc_sgl[i]));
-			kfree(tv_cmd->tvc_sgl);
-			tv_cmd->tvc_sgl = NULL;
-			tv_cmd->tvc_sgl_count = 0;
-			return ret;
-		}
-
-		sg += ret;
-		sgl_count -= ret;
-	}
-	return 0;
-}
-
-static void tcm_vhost_submission_work(struct work_struct *work)
-{
-	struct tcm_vhost_cmd *tv_cmd =
-		container_of(work, struct tcm_vhost_cmd, work);
-	struct tcm_vhost_nexus *tv_nexus;
-	struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
-	struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
-	int rc, sg_no_bidi = 0;
-
-	if (tv_cmd->tvc_sgl_count) {
-		sg_ptr = tv_cmd->tvc_sgl;
-/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
-#if 0
-		if (se_cmd->se_cmd_flags & SCF_BIDI) {
-			sg_bidi_ptr = NULL;
-			sg_no_bidi = 0;
-		}
-#endif
-	} else {
-		sg_ptr = NULL;
-	}
-	tv_nexus = tv_cmd->tvc_nexus;
-
-	rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
-			tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0],
-			tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len,
-			tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction,
-			0, sg_ptr, tv_cmd->tvc_sgl_count,
-			sg_bidi_ptr, sg_no_bidi);
-	if (rc < 0) {
-		transport_send_check_condition_and_sense(se_cmd,
-				TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
-		transport_generic_free_cmd(se_cmd, 0);
-	}
-}
-
-static void vhost_scsi_send_bad_target(struct vhost_scsi *vs,
-	struct vhost_virtqueue *vq, int head, unsigned out)
-{
-	struct virtio_scsi_cmd_resp __user *resp;
-	struct virtio_scsi_cmd_resp rsp;
-	int ret;
-
-	memset(&rsp, 0, sizeof(rsp));
-	rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
-	resp = vq->iov[out].iov_base;
-	ret = __copy_to_user(resp, &rsp, sizeof(rsp));
-	if (!ret)
-		vhost_add_used_and_signal(&vs->dev, vq, head, 0);
-	else
-		pr_err("Faulted on virtio_scsi_cmd_resp\n");
-}
-
-static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
-	struct vhost_virtqueue *vq)
-{
-	struct tcm_vhost_tpg **vs_tpg;
-	struct virtio_scsi_cmd_req v_req;
-	struct tcm_vhost_tpg *tv_tpg;
-	struct tcm_vhost_cmd *tv_cmd;
-	u32 exp_data_len, data_first, data_num, data_direction;
-	unsigned out, in, i;
-	int head, ret;
-	u8 target;
-
-	/*
-	 * We can handle the vq only after the endpoint is setup by calling the
-	 * VHOST_SCSI_SET_ENDPOINT ioctl.
-	 *
-	 * TODO: Check that we are running from vhost_worker which acts
-	 * as read-side critical section for vhost kind of RCU.
-	 * See the comments in struct vhost_virtqueue in drivers/vhost/vhost.h
-	 */
-	vs_tpg = rcu_dereference_check(vq->private_data, 1);
-	if (!vs_tpg)
-		return;
-
-	mutex_lock(&vq->mutex);
-	vhost_disable_notify(&vs->dev, vq);
-
-	for (;;) {
-		head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
-					ARRAY_SIZE(vq->iov), &out, &in,
-					NULL, NULL);
-		pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
-					head, out, in);
-		/* On error, stop handling until the next kick. */
-		if (unlikely(head < 0))
-			break;
-		/* Nothing new?  Wait for eventfd to tell us they refilled. */
-		if (head == vq->num) {
-			if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
-				vhost_disable_notify(&vs->dev, vq);
-				continue;
-			}
-			break;
-		}
-
-/* FIXME: BIDI operation */
-		if (out == 1 && in == 1) {
-			data_direction = DMA_NONE;
-			data_first = 0;
-			data_num = 0;
-		} else if (out == 1 && in > 1) {
-			data_direction = DMA_FROM_DEVICE;
-			data_first = out + 1;
-			data_num = in - 1;
-		} else if (out > 1 && in == 1) {
-			data_direction = DMA_TO_DEVICE;
-			data_first = 1;
-			data_num = out - 1;
-		} else {
-			vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
-					out, in);
-			break;
-		}
-
-		/*
-		 * Check for a sane resp buffer so we can report errors to
-		 * the guest.
-		 */
-		if (unlikely(vq->iov[out].iov_len !=
-					sizeof(struct virtio_scsi_cmd_resp))) {
-			vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
-				" bytes\n", vq->iov[out].iov_len);
-			break;
-		}
-
-		if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
-			vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
-				" bytes\n", vq->iov[0].iov_len);
-			break;
-		}
-		pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
-			" len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
-		ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
-				sizeof(v_req));
-		if (unlikely(ret)) {
-			vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
-			break;
-		}
-
-		/* Extract the tpgt */
-		target = v_req.lun[1];
-		tv_tpg = ACCESS_ONCE(vs_tpg[target]);
-
-		/* Target does not exist, fail the request */
-		if (unlikely(!tv_tpg)) {
-			vhost_scsi_send_bad_target(vs, vq, head, out);
-			continue;
-		}
-
-		exp_data_len = 0;
-		for (i = 0; i < data_num; i++)
-			exp_data_len += vq->iov[data_first + i].iov_len;
-
-		tv_cmd = vhost_scsi_allocate_cmd(vq, tv_tpg, &v_req,
-					exp_data_len, data_direction);
-		if (IS_ERR(tv_cmd)) {
-			vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
-					PTR_ERR(tv_cmd));
-			goto err_cmd;
-		}
-		pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
-			": %d\n", tv_cmd, exp_data_len, data_direction);
-
-		tv_cmd->tvc_vhost = vs;
-		tv_cmd->tvc_vq = vq;
-		tv_cmd->tvc_resp = vq->iov[out].iov_base;
-
-		/*
-		 * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
-		 * that will be used by tcm_vhost_new_cmd_map() and down into
-		 * target_setup_cmd_from_cdb()
-		 */
-		memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
-		/*
-		 * Check that the recieved CDB size does not exceeded our
-		 * hardcoded max for tcm_vhost
-		 */
-		/* TODO what if cdb was too small for varlen cdb header? */
-		if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
-					TCM_VHOST_MAX_CDB_SIZE)) {
-			vq_err(vq, "Received SCSI CDB with command_size: %d that"
-				" exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
-				scsi_command_size(tv_cmd->tvc_cdb),
-				TCM_VHOST_MAX_CDB_SIZE);
-			goto err_free;
-		}
-		tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
-
-		pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
-			tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
-
-		if (data_direction != DMA_NONE) {
-			ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
-					&vq->iov[data_first], data_num,
-					data_direction == DMA_TO_DEVICE);
-			if (unlikely(ret)) {
-				vq_err(vq, "Failed to map iov to sgl\n");
-				goto err_free;
-			}
-		}
-
-		/*
-		 * Save the descriptor from vhost_get_vq_desc() to be used to
-		 * complete the virtio-scsi request in TCM callback context via
-		 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
-		 */
-		tv_cmd->tvc_vq_desc = head;
-		/*
-		 * Dispatch tv_cmd descriptor for cmwq execution in process
-		 * context provided by tcm_vhost_workqueue.  This also ensures
-		 * tv_cmd is executed on the same kworker CPU as this vhost
-		 * thread to gain positive L2 cache locality effects..
-		 */
-		INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
-		queue_work(tcm_vhost_workqueue, &tv_cmd->work);
-	}
-
-	mutex_unlock(&vq->mutex);
-	return;
-
-err_free:
-	vhost_scsi_free_cmd(tv_cmd);
-err_cmd:
-	vhost_scsi_send_bad_target(vs, vq, head, out);
-	mutex_unlock(&vq->mutex);
-}
-
-static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
-{
-	pr_debug("%s: The handling func for control queue.\n", __func__);
-}
-
-static void tcm_vhost_send_evt(struct vhost_scsi *vs, struct tcm_vhost_tpg *tpg,
-	struct se_lun *lun, u32 event, u32 reason)
-{
-	struct tcm_vhost_evt *evt;
-
-	evt = tcm_vhost_allocate_evt(vs, event, reason);
-	if (!evt)
-		return;
-
-	if (tpg && lun) {
-		/* TODO: share lun setup code with virtio-scsi.ko */
-		/*
-		 * Note: evt->event is zeroed when we allocate it and
-		 * lun[4-7] need to be zero according to virtio-scsi spec.
-		 */
-		evt->event.lun[0] = 0x01;
-		evt->event.lun[1] = tpg->tport_tpgt & 0xFF;
-		if (lun->unpacked_lun >= 256)
-			evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
-		evt->event.lun[3] = lun->unpacked_lun & 0xFF;
-	}
-
-	llist_add(&evt->list, &vs->vs_event_list);
-	vhost_work_queue(&vs->dev, &vs->vs_event_work);
-}
-
-static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
-{
-	struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
-						poll.work);
-	struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
-
-	mutex_lock(&vq->mutex);
-	if (!vq->private_data)
-		goto out;
-
-	if (vs->vs_events_missed)
-		tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
-out:
-	mutex_unlock(&vq->mutex);
-}
-
-static void vhost_scsi_handle_kick(struct vhost_work *work)
-{
-	struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
-						poll.work);
-	struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
-
-	vhost_scsi_handle_vq(vs, vq);
-}
-
-static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
-{
-	vhost_poll_flush(&vs->vqs[index].vq.poll);
-}
-
-/* Callers must hold dev mutex */
-static void vhost_scsi_flush(struct vhost_scsi *vs)
-{
-	struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
-	int i;
-
-	/* Init new inflight and remember the old inflight */
-	tcm_vhost_init_inflight(vs, old_inflight);
-
-	/*
-	 * The inflight->kref was initialized to 1. We decrement it here to
-	 * indicate the start of the flush operation so that it will reach 0
-	 * when all the reqs are finished.
-	 */
-	for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
-		kref_put(&old_inflight[i]->kref, tcm_vhost_done_inflight);
-
-	/* Flush both the vhost poll and vhost work */
-	for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
-		vhost_scsi_flush_vq(vs, i);
-	vhost_work_flush(&vs->dev, &vs->vs_completion_work);
-	vhost_work_flush(&vs->dev, &vs->vs_event_work);
-
-	/* Wait for all reqs issued before the flush to be finished */
-	for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
-		wait_for_completion(&old_inflight[i]->comp);
-}
-
-/*
- * Called from vhost_scsi_ioctl() context to walk the list of available
- * tcm_vhost_tpg with an active struct tcm_vhost_nexus
- *
- *  The lock nesting rule is:
- *    tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
- */
-static int vhost_scsi_set_endpoint(
-	struct vhost_scsi *vs,
-	struct vhost_scsi_target *t)
-{
-	struct tcm_vhost_tport *tv_tport;
-	struct tcm_vhost_tpg *tv_tpg;
-	struct tcm_vhost_tpg **vs_tpg;
-	struct vhost_virtqueue *vq;
-	int index, ret, i, len;
-	bool match = false;
-
-	mutex_lock(&tcm_vhost_mutex);
-	mutex_lock(&vs->dev.mutex);
-
-	/* Verify that ring has been setup correctly. */
-	for (index = 0; index < vs->dev.nvqs; ++index) {
-		/* Verify that ring has been setup correctly. */
-		if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
-			ret = -EFAULT;
-			goto out;
-		}
-	}
-
-	len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
-	vs_tpg = kzalloc(len, GFP_KERNEL);
-	if (!vs_tpg) {
-		ret = -ENOMEM;
-		goto out;
-	}
-	if (vs->vs_tpg)
-		memcpy(vs_tpg, vs->vs_tpg, len);
-
-	list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
-		mutex_lock(&tv_tpg->tv_tpg_mutex);
-		if (!tv_tpg->tpg_nexus) {
-			mutex_unlock(&tv_tpg->tv_tpg_mutex);
-			continue;
-		}
-		if (tv_tpg->tv_tpg_vhost_count != 0) {
-			mutex_unlock(&tv_tpg->tv_tpg_mutex);
-			continue;
-		}
-		tv_tport = tv_tpg->tport;
-
-		if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
-			if (vs->vs_tpg && vs->vs_tpg[tv_tpg->tport_tpgt]) {
-				kfree(vs_tpg);
-				mutex_unlock(&tv_tpg->tv_tpg_mutex);
-				ret = -EEXIST;
-				goto out;
-			}
-			tv_tpg->tv_tpg_vhost_count++;
-			tv_tpg->vhost_scsi = vs;
-			vs_tpg[tv_tpg->tport_tpgt] = tv_tpg;
-			smp_mb__after_atomic_inc();
-			match = true;
-		}
-		mutex_unlock(&tv_tpg->tv_tpg_mutex);
-	}
-
-	if (match) {
-		memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
-		       sizeof(vs->vs_vhost_wwpn));
-		for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
-			vq = &vs->vqs[i].vq;
-			/* Flushing the vhost_work acts as synchronize_rcu */
-			mutex_lock(&vq->mutex);
-			rcu_assign_pointer(vq->private_data, vs_tpg);
-			vhost_init_used(vq);
-			mutex_unlock(&vq->mutex);
-		}
-		ret = 0;
-	} else {
-		ret = -EEXIST;
-	}
-
-	/*
-	 * Act as synchronize_rcu to make sure access to
-	 * old vs->vs_tpg is finished.
-	 */
-	vhost_scsi_flush(vs);
-	kfree(vs->vs_tpg);
-	vs->vs_tpg = vs_tpg;
-
-out:
-	mutex_unlock(&vs->dev.mutex);
-	mutex_unlock(&tcm_vhost_mutex);
-	return ret;
-}
-
-static int vhost_scsi_clear_endpoint(
-	struct vhost_scsi *vs,
-	struct vhost_scsi_target *t)
-{
-	struct tcm_vhost_tport *tv_tport;
-	struct tcm_vhost_tpg *tv_tpg;
-	struct vhost_virtqueue *vq;
-	bool match = false;
-	int index, ret, i;
-	u8 target;
-
-	mutex_lock(&tcm_vhost_mutex);
-	mutex_lock(&vs->dev.mutex);
-	/* Verify that ring has been setup correctly. */
-	for (index = 0; index < vs->dev.nvqs; ++index) {
-		if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
-			ret = -EFAULT;
-			goto err_dev;
-		}
-	}
-
-	if (!vs->vs_tpg) {
-		ret = 0;
-		goto err_dev;
-	}
-
-	for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
-		target = i;
-		tv_tpg = vs->vs_tpg[target];
-		if (!tv_tpg)
-			continue;
-
-		mutex_lock(&tv_tpg->tv_tpg_mutex);
-		tv_tport = tv_tpg->tport;
-		if (!tv_tport) {
-			ret = -ENODEV;
-			goto err_tpg;
-		}
-
-		if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
-			pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
-				" does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
-				tv_tport->tport_name, tv_tpg->tport_tpgt,
-				t->vhost_wwpn, t->vhost_tpgt);
-			ret = -EINVAL;
-			goto err_tpg;
-		}
-		tv_tpg->tv_tpg_vhost_count--;
-		tv_tpg->vhost_scsi = NULL;
-		vs->vs_tpg[target] = NULL;
-		match = true;
-		mutex_unlock(&tv_tpg->tv_tpg_mutex);
-	}
-	if (match) {
-		for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
-			vq = &vs->vqs[i].vq;
-			/* Flushing the vhost_work acts as synchronize_rcu */
-			mutex_lock(&vq->mutex);
-			rcu_assign_pointer(vq->private_data, NULL);
-			mutex_unlock(&vq->mutex);
-		}
-	}
-	/*
-	 * Act as synchronize_rcu to make sure access to
-	 * old vs->vs_tpg is finished.
-	 */
-	vhost_scsi_flush(vs);
-	kfree(vs->vs_tpg);
-	vs->vs_tpg = NULL;
-	WARN_ON(vs->vs_events_nr);
-	mutex_unlock(&vs->dev.mutex);
-	mutex_unlock(&tcm_vhost_mutex);
-	return 0;
-
-err_tpg:
-	mutex_unlock(&tv_tpg->tv_tpg_mutex);
-err_dev:
-	mutex_unlock(&vs->dev.mutex);
-	mutex_unlock(&tcm_vhost_mutex);
-	return ret;
-}
-
-static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
-{
-	if (features & ~VHOST_SCSI_FEATURES)
-		return -EOPNOTSUPP;
-
-	mutex_lock(&vs->dev.mutex);
-	if ((features & (1 << VHOST_F_LOG_ALL)) &&
-	    !vhost_log_access_ok(&vs->dev)) {
-		mutex_unlock(&vs->dev.mutex);
-		return -EFAULT;
-	}
-	vs->dev.acked_features = features;
-	smp_wmb();
-	vhost_scsi_flush(vs);
-	mutex_unlock(&vs->dev.mutex);
-	return 0;
-}
-
-static int vhost_scsi_open(struct inode *inode, struct file *f)
-{
-	struct vhost_scsi *s;
-	struct vhost_virtqueue **vqs;
-	int r, i;
-
-	s = kzalloc(sizeof(*s), GFP_KERNEL);
-	if (!s)
-		return -ENOMEM;
-
-	vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
-	if (!vqs) {
-		kfree(s);
-		return -ENOMEM;
-	}
-
-	vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
-	vhost_work_init(&s->vs_event_work, tcm_vhost_evt_work);
-
-	s->vs_events_nr = 0;
-	s->vs_events_missed = false;
-
-	vqs[VHOST_SCSI_VQ_CTL] = &s->vqs[VHOST_SCSI_VQ_CTL].vq;
-	vqs[VHOST_SCSI_VQ_EVT] = &s->vqs[VHOST_SCSI_VQ_EVT].vq;
-	s->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
-	s->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
-	for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
-		vqs[i] = &s->vqs[i].vq;
-		s->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
-	}
-	r = vhost_dev_init(&s->dev, vqs, VHOST_SCSI_MAX_VQ);
-
-	tcm_vhost_init_inflight(s, NULL);
-
-	if (r < 0) {
-		kfree(vqs);
-		kfree(s);
-		return r;
-	}
-
-	f->private_data = s;
-	return 0;
-}
-
-static int vhost_scsi_release(struct inode *inode, struct file *f)
-{
-	struct vhost_scsi *s = f->private_data;
-	struct vhost_scsi_target t;
-
-	mutex_lock(&s->dev.mutex);
-	memcpy(t.vhost_wwpn, s->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
-	mutex_unlock(&s->dev.mutex);
-	vhost_scsi_clear_endpoint(s, &t);
-	vhost_dev_stop(&s->dev);
-	vhost_dev_cleanup(&s->dev, false);
-	/* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
-	vhost_scsi_flush(s);
-	kfree(s->dev.vqs);
-	kfree(s);
-	return 0;
-}
-
-static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
-				unsigned long arg)
-{
-	struct vhost_scsi *vs = f->private_data;
-	struct vhost_scsi_target backend;
-	void __user *argp = (void __user *)arg;
-	u64 __user *featurep = argp;
-	u32 __user *eventsp = argp;
-	u32 events_missed;
-	u64 features;
-	int r, abi_version = VHOST_SCSI_ABI_VERSION;
-	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
-
-	switch (ioctl) {
-	case VHOST_SCSI_SET_ENDPOINT:
-		if (copy_from_user(&backend, argp, sizeof backend))
-			return -EFAULT;
-		if (backend.reserved != 0)
-			return -EOPNOTSUPP;
-
-		return vhost_scsi_set_endpoint(vs, &backend);
-	case VHOST_SCSI_CLEAR_ENDPOINT:
-		if (copy_from_user(&backend, argp, sizeof backend))
-			return -EFAULT;
-		if (backend.reserved != 0)
-			return -EOPNOTSUPP;
-
-		return vhost_scsi_clear_endpoint(vs, &backend);
-	case VHOST_SCSI_GET_ABI_VERSION:
-		if (copy_to_user(argp, &abi_version, sizeof abi_version))
-			return -EFAULT;
-		return 0;
-	case VHOST_SCSI_SET_EVENTS_MISSED:
-		if (get_user(events_missed, eventsp))
-			return -EFAULT;
-		mutex_lock(&vq->mutex);
-		vs->vs_events_missed = events_missed;
-		mutex_unlock(&vq->mutex);
-		return 0;
-	case VHOST_SCSI_GET_EVENTS_MISSED:
-		mutex_lock(&vq->mutex);
-		events_missed = vs->vs_events_missed;
-		mutex_unlock(&vq->mutex);
-		if (put_user(events_missed, eventsp))
-			return -EFAULT;
-		return 0;
-	case VHOST_GET_FEATURES:
-		features = VHOST_SCSI_FEATURES;
-		if (copy_to_user(featurep, &features, sizeof features))
-			return -EFAULT;
-		return 0;
-	case VHOST_SET_FEATURES:
-		if (copy_from_user(&features, featurep, sizeof features))
-			return -EFAULT;
-		return vhost_scsi_set_features(vs, features);
-	default:
-		mutex_lock(&vs->dev.mutex);
-		r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
-		/* TODO: flush backend after dev ioctl. */
-		if (r == -ENOIOCTLCMD)
-			r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
-		mutex_unlock(&vs->dev.mutex);
-		return r;
-	}
-}
-
-#ifdef CONFIG_COMPAT
-static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
-				unsigned long arg)
-{
-	return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
-}
-#endif
-
-static const struct file_operations vhost_scsi_fops = {
-	.owner          = THIS_MODULE,
-	.release        = vhost_scsi_release,
-	.unlocked_ioctl = vhost_scsi_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl	= vhost_scsi_compat_ioctl,
-#endif
-	.open           = vhost_scsi_open,
-	.llseek		= noop_llseek,
-};
-
-static struct miscdevice vhost_scsi_misc = {
-	MISC_DYNAMIC_MINOR,
-	"vhost-scsi",
-	&vhost_scsi_fops,
-};
-
-static int __init vhost_scsi_register(void)
-{
-	return misc_register(&vhost_scsi_misc);
-}
-
-static int vhost_scsi_deregister(void)
-{
-	return misc_deregister(&vhost_scsi_misc);
-}
-
-static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
-{
-	switch (tport->tport_proto_id) {
-	case SCSI_PROTOCOL_SAS:
-		return "SAS";
-	case SCSI_PROTOCOL_FCP:
-		return "FCP";
-	case SCSI_PROTOCOL_ISCSI:
-		return "iSCSI";
-	default:
-		break;
-	}
-
-	return "Unknown";
-}
-
-static void tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg,
-	struct se_lun *lun, bool plug)
-{
-
-	struct vhost_scsi *vs = tpg->vhost_scsi;
-	struct vhost_virtqueue *vq;
-	u32 reason;
-
-	if (!vs)
-		return;
-
-	mutex_lock(&vs->dev.mutex);
-	if (!vhost_has_feature(&vs->dev, VIRTIO_SCSI_F_HOTPLUG)) {
-		mutex_unlock(&vs->dev.mutex);
-		return;
-	}
-
-	if (plug)
-		reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
-	else
-		reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
-
-	vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
-	mutex_lock(&vq->mutex);
-	tcm_vhost_send_evt(vs, tpg, lun,
-			VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
-	mutex_unlock(&vq->mutex);
-	mutex_unlock(&vs->dev.mutex);
-}
-
-static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
-{
-	tcm_vhost_do_plug(tpg, lun, true);
-}
-
-static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
-{
-	tcm_vhost_do_plug(tpg, lun, false);
-}
-
-static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
-	struct se_lun *lun)
-{
-	struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-
-	mutex_lock(&tcm_vhost_mutex);
-
-	mutex_lock(&tv_tpg->tv_tpg_mutex);
-	tv_tpg->tv_tpg_port_count++;
-	mutex_unlock(&tv_tpg->tv_tpg_mutex);
-
-	tcm_vhost_hotplug(tv_tpg, lun);
-
-	mutex_unlock(&tcm_vhost_mutex);
-
-	return 0;
-}
-
-static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
-	struct se_lun *lun)
-{
-	struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-
-	mutex_lock(&tcm_vhost_mutex);
-
-	mutex_lock(&tv_tpg->tv_tpg_mutex);
-	tv_tpg->tv_tpg_port_count--;
-	mutex_unlock(&tv_tpg->tv_tpg_mutex);
-
-	tcm_vhost_hotunplug(tv_tpg, lun);
-
-	mutex_unlock(&tcm_vhost_mutex);
-}
-
-static struct se_node_acl *tcm_vhost_make_nodeacl(
-	struct se_portal_group *se_tpg,
-	struct config_group *group,
-	const char *name)
-{
-	struct se_node_acl *se_nacl, *se_nacl_new;
-	struct tcm_vhost_nacl *nacl;
-	u64 wwpn = 0;
-	u32 nexus_depth;
-
-	/* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
-		return ERR_PTR(-EINVAL); */
-	se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
-	if (!se_nacl_new)
-		return ERR_PTR(-ENOMEM);
-
-	nexus_depth = 1;
-	/*
-	 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
-	 * when converting a NodeACL from demo mode -> explict
-	 */
-	se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
-				name, nexus_depth);
-	if (IS_ERR(se_nacl)) {
-		tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
-		return se_nacl;
-	}
-	/*
-	 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
-	 */
-	nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
-	nacl->iport_wwpn = wwpn;
-
-	return se_nacl;
-}
-
-static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
-{
-	struct tcm_vhost_nacl *nacl = container_of(se_acl,
-				struct tcm_vhost_nacl, se_node_acl);
-	core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
-	kfree(nacl);
-}
-
-static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
-	const char *name)
-{
-	struct se_portal_group *se_tpg;
-	struct tcm_vhost_nexus *tv_nexus;
-
-	mutex_lock(&tv_tpg->tv_tpg_mutex);
-	if (tv_tpg->tpg_nexus) {
-		mutex_unlock(&tv_tpg->tv_tpg_mutex);
-		pr_debug("tv_tpg->tpg_nexus already exists\n");
-		return -EEXIST;
-	}
-	se_tpg = &tv_tpg->se_tpg;
-
-	tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
-	if (!tv_nexus) {
-		mutex_unlock(&tv_tpg->tv_tpg_mutex);
-		pr_err("Unable to allocate struct tcm_vhost_nexus\n");
-		return -ENOMEM;
-	}
-	/*
-	 *  Initialize the struct se_session pointer
-	 */
-	tv_nexus->tvn_se_sess = transport_init_session();
-	if (IS_ERR(tv_nexus->tvn_se_sess)) {
-		mutex_unlock(&tv_tpg->tv_tpg_mutex);
-		kfree(tv_nexus);
-		return -ENOMEM;
-	}
-	/*
-	 * Since we are running in 'demo mode' this call with generate a
-	 * struct se_node_acl for the tcm_vhost struct se_portal_group with
-	 * the SCSI Initiator port name of the passed configfs group 'name'.
-	 */
-	tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
-				se_tpg, (unsigned char *)name);
-	if (!tv_nexus->tvn_se_sess->se_node_acl) {
-		mutex_unlock(&tv_tpg->tv_tpg_mutex);
-		pr_debug("core_tpg_check_initiator_node_acl() failed"
-				" for %s\n", name);
-		transport_free_session(tv_nexus->tvn_se_sess);
-		kfree(tv_nexus);
-		return -ENOMEM;
-	}
-	/*
-	 * Now register the TCM vhost virtual I_T Nexus as active with the
-	 * call to __transport_register_session()
-	 */
-	__transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
-			tv_nexus->tvn_se_sess, tv_nexus);
-	tv_tpg->tpg_nexus = tv_nexus;
-
-	mutex_unlock(&tv_tpg->tv_tpg_mutex);
-	return 0;
-}
-
-static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg)
-{
-	struct se_session *se_sess;
-	struct tcm_vhost_nexus *tv_nexus;
-
-	mutex_lock(&tpg->tv_tpg_mutex);
-	tv_nexus = tpg->tpg_nexus;
-	if (!tv_nexus) {
-		mutex_unlock(&tpg->tv_tpg_mutex);
-		return -ENODEV;
-	}
-
-	se_sess = tv_nexus->tvn_se_sess;
-	if (!se_sess) {
-		mutex_unlock(&tpg->tv_tpg_mutex);
-		return -ENODEV;
-	}
-
-	if (tpg->tv_tpg_port_count != 0) {
-		mutex_unlock(&tpg->tv_tpg_mutex);
-		pr_err("Unable to remove TCM_vhost I_T Nexus with"
-			" active TPG port count: %d\n",
-			tpg->tv_tpg_port_count);
-		return -EBUSY;
-	}
-
-	if (tpg->tv_tpg_vhost_count != 0) {
-		mutex_unlock(&tpg->tv_tpg_mutex);
-		pr_err("Unable to remove TCM_vhost I_T Nexus with"
-			" active TPG vhost count: %d\n",
-			tpg->tv_tpg_vhost_count);
-		return -EBUSY;
-	}
-
-	pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
-		" %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
-		tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
-	/*
-	 * Release the SCSI I_T Nexus to the emulated vhost Target Port
-	 */
-	transport_deregister_session(tv_nexus->tvn_se_sess);
-	tpg->tpg_nexus = NULL;
-	mutex_unlock(&tpg->tv_tpg_mutex);
-
-	kfree(tv_nexus);
-	return 0;
-}
-
-static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg,
-	char *page)
-{
-	struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-	struct tcm_vhost_nexus *tv_nexus;
-	ssize_t ret;
-
-	mutex_lock(&tv_tpg->tv_tpg_mutex);
-	tv_nexus = tv_tpg->tpg_nexus;
-	if (!tv_nexus) {
-		mutex_unlock(&tv_tpg->tv_tpg_mutex);
-		return -ENODEV;
-	}
-	ret = snprintf(page, PAGE_SIZE, "%s\n",
-			tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
-	mutex_unlock(&tv_tpg->tv_tpg_mutex);
-
-	return ret;
-}
-
-static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg,
-	const char *page,
-	size_t count)
-{
-	struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-	struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
-	unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
-	int ret;
-	/*
-	 * Shutdown the active I_T nexus if 'NULL' is passed..
-	 */
-	if (!strncmp(page, "NULL", 4)) {
-		ret = tcm_vhost_drop_nexus(tv_tpg);
-		return (!ret) ? count : ret;
-	}
-	/*
-	 * Otherwise make sure the passed virtual Initiator port WWN matches
-	 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
-	 * tcm_vhost_make_nexus().
-	 */
-	if (strlen(page) >= TCM_VHOST_NAMELEN) {
-		pr_err("Emulated NAA Sas Address: %s, exceeds"
-				" max: %d\n", page, TCM_VHOST_NAMELEN);
-		return -EINVAL;
-	}
-	snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
-
-	ptr = strstr(i_port, "naa.");
-	if (ptr) {
-		if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
-			pr_err("Passed SAS Initiator Port %s does not"
-				" match target port protoid: %s\n", i_port,
-				tcm_vhost_dump_proto_id(tport_wwn));
-			return -EINVAL;
-		}
-		port_ptr = &i_port[0];
-		goto check_newline;
-	}
-	ptr = strstr(i_port, "fc.");
-	if (ptr) {
-		if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
-			pr_err("Passed FCP Initiator Port %s does not"
-				" match target port protoid: %s\n", i_port,
-				tcm_vhost_dump_proto_id(tport_wwn));
-			return -EINVAL;
-		}
-		port_ptr = &i_port[3]; /* Skip over "fc." */
-		goto check_newline;
-	}
-	ptr = strstr(i_port, "iqn.");
-	if (ptr) {
-		if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
-			pr_err("Passed iSCSI Initiator Port %s does not"
-				" match target port protoid: %s\n", i_port,
-				tcm_vhost_dump_proto_id(tport_wwn));
-			return -EINVAL;
-		}
-		port_ptr = &i_port[0];
-		goto check_newline;
-	}
-	pr_err("Unable to locate prefix for emulated Initiator Port:"
-			" %s\n", i_port);
-	return -EINVAL;
-	/*
-	 * Clear any trailing newline for the NAA WWN
-	 */
-check_newline:
-	if (i_port[strlen(i_port)-1] == '\n')
-		i_port[strlen(i_port)-1] = '\0';
-
-	ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
-	if (ret < 0)
-		return ret;
-
-	return count;
-}
-
-TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
-
-static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
-	&tcm_vhost_tpg_nexus.attr,
-	NULL,
-};
-
-static struct se_portal_group *tcm_vhost_make_tpg(struct se_wwn *wwn,
-	struct config_group *group,
-	const char *name)
-{
-	struct tcm_vhost_tport *tport = container_of(wwn,
-			struct tcm_vhost_tport, tport_wwn);
-
-	struct tcm_vhost_tpg *tpg;
-	unsigned long tpgt;
-	int ret;
-
-	if (strstr(name, "tpgt_") != name)
-		return ERR_PTR(-EINVAL);
-	if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
-		return ERR_PTR(-EINVAL);
-
-	tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
-	if (!tpg) {
-		pr_err("Unable to allocate struct tcm_vhost_tpg");
-		return ERR_PTR(-ENOMEM);
-	}
-	mutex_init(&tpg->tv_tpg_mutex);
-	INIT_LIST_HEAD(&tpg->tv_tpg_list);
-	tpg->tport = tport;
-	tpg->tport_tpgt = tpgt;
-
-	ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
-				&tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
-	if (ret < 0) {
-		kfree(tpg);
-		return NULL;
-	}
-	mutex_lock(&tcm_vhost_mutex);
-	list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
-	mutex_unlock(&tcm_vhost_mutex);
-
-	return &tpg->se_tpg;
-}
-
-static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
-{
-	struct tcm_vhost_tpg *tpg = container_of(se_tpg,
-				struct tcm_vhost_tpg, se_tpg);
-
-	mutex_lock(&tcm_vhost_mutex);
-	list_del(&tpg->tv_tpg_list);
-	mutex_unlock(&tcm_vhost_mutex);
-	/*
-	 * Release the virtual I_T Nexus for this vhost TPG
-	 */
-	tcm_vhost_drop_nexus(tpg);
-	/*
-	 * Deregister the se_tpg from TCM..
-	 */
-	core_tpg_deregister(se_tpg);
-	kfree(tpg);
-}
-
-static struct se_wwn *tcm_vhost_make_tport(struct target_fabric_configfs *tf,
-	struct config_group *group,
-	const char *name)
-{
-	struct tcm_vhost_tport *tport;
-	char *ptr;
-	u64 wwpn = 0;
-	int off = 0;
-
-	/* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
-		return ERR_PTR(-EINVAL); */
-
-	tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
-	if (!tport) {
-		pr_err("Unable to allocate struct tcm_vhost_tport");
-		return ERR_PTR(-ENOMEM);
-	}
-	tport->tport_wwpn = wwpn;
-	/*
-	 * Determine the emulated Protocol Identifier and Target Port Name
-	 * based on the incoming configfs directory name.
-	 */
-	ptr = strstr(name, "naa.");
-	if (ptr) {
-		tport->tport_proto_id = SCSI_PROTOCOL_SAS;
-		goto check_len;
-	}
-	ptr = strstr(name, "fc.");
-	if (ptr) {
-		tport->tport_proto_id = SCSI_PROTOCOL_FCP;
-		off = 3; /* Skip over "fc." */
-		goto check_len;
-	}
-	ptr = strstr(name, "iqn.");
-	if (ptr) {
-		tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
-		goto check_len;
-	}
-
-	pr_err("Unable to locate prefix for emulated Target Port:"
-			" %s\n", name);
-	kfree(tport);
-	return ERR_PTR(-EINVAL);
-
-check_len:
-	if (strlen(name) >= TCM_VHOST_NAMELEN) {
-		pr_err("Emulated %s Address: %s, exceeds"
-			" max: %d\n", name, tcm_vhost_dump_proto_id(tport),
-			TCM_VHOST_NAMELEN);
-		kfree(tport);
-		return ERR_PTR(-EINVAL);
-	}
-	snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
-
-	pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
-		" %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
-
-	return &tport->tport_wwn;
-}
-
-static void tcm_vhost_drop_tport(struct se_wwn *wwn)
-{
-	struct tcm_vhost_tport *tport = container_of(wwn,
-				struct tcm_vhost_tport, tport_wwn);
-
-	pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
-		" %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
-		tport->tport_name);
-
-	kfree(tport);
-}
-
-static ssize_t tcm_vhost_wwn_show_attr_version(
-	struct target_fabric_configfs *tf,
-	char *page)
-{
-	return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
-		"on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
-		utsname()->machine);
-}
-
-TF_WWN_ATTR_RO(tcm_vhost, version);
-
-static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
-	&tcm_vhost_wwn_version.attr,
-	NULL,
-};
-
-static struct target_core_fabric_ops tcm_vhost_ops = {
-	.get_fabric_name		= tcm_vhost_get_fabric_name,
-	.get_fabric_proto_ident		= tcm_vhost_get_fabric_proto_ident,
-	.tpg_get_wwn			= tcm_vhost_get_fabric_wwn,
-	.tpg_get_tag			= tcm_vhost_get_tag,
-	.tpg_get_default_depth		= tcm_vhost_get_default_depth,
-	.tpg_get_pr_transport_id	= tcm_vhost_get_pr_transport_id,
-	.tpg_get_pr_transport_id_len	= tcm_vhost_get_pr_transport_id_len,
-	.tpg_parse_pr_out_transport_id	= tcm_vhost_parse_pr_out_transport_id,
-	.tpg_check_demo_mode		= tcm_vhost_check_true,
-	.tpg_check_demo_mode_cache	= tcm_vhost_check_true,
-	.tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
-	.tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
-	.tpg_alloc_fabric_acl		= tcm_vhost_alloc_fabric_acl,
-	.tpg_release_fabric_acl		= tcm_vhost_release_fabric_acl,
-	.tpg_get_inst_index		= tcm_vhost_tpg_get_inst_index,
-	.release_cmd			= tcm_vhost_release_cmd,
-	.shutdown_session		= tcm_vhost_shutdown_session,
-	.close_session			= tcm_vhost_close_session,
-	.sess_get_index			= tcm_vhost_sess_get_index,
-	.sess_get_initiator_sid		= NULL,
-	.write_pending			= tcm_vhost_write_pending,
-	.write_pending_status		= tcm_vhost_write_pending_status,
-	.set_default_node_attributes	= tcm_vhost_set_default_node_attrs,
-	.get_task_tag			= tcm_vhost_get_task_tag,
-	.get_cmd_state			= tcm_vhost_get_cmd_state,
-	.queue_data_in			= tcm_vhost_queue_data_in,
-	.queue_status			= tcm_vhost_queue_status,
-	.queue_tm_rsp			= tcm_vhost_queue_tm_rsp,
-	/*
-	 * Setup callers for generic logic in target_core_fabric_configfs.c
-	 */
-	.fabric_make_wwn		= tcm_vhost_make_tport,
-	.fabric_drop_wwn		= tcm_vhost_drop_tport,
-	.fabric_make_tpg		= tcm_vhost_make_tpg,
-	.fabric_drop_tpg		= tcm_vhost_drop_tpg,
-	.fabric_post_link		= tcm_vhost_port_link,
-	.fabric_pre_unlink		= tcm_vhost_port_unlink,
-	.fabric_make_np			= NULL,
-	.fabric_drop_np			= NULL,
-	.fabric_make_nodeacl		= tcm_vhost_make_nodeacl,
-	.fabric_drop_nodeacl		= tcm_vhost_drop_nodeacl,
-};
-
-static int tcm_vhost_register_configfs(void)
-{
-	struct target_fabric_configfs *fabric;
-	int ret;
-
-	pr_debug("TCM_VHOST fabric module %s on %s/%s"
-		" on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
-		utsname()->machine);
-	/*
-	 * Register the top level struct config_item_type with TCM core
-	 */
-	fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
-	if (IS_ERR(fabric)) {
-		pr_err("target_fabric_configfs_init() failed\n");
-		return PTR_ERR(fabric);
-	}
-	/*
-	 * Setup fabric->tf_ops from our local tcm_vhost_ops
-	 */
-	fabric->tf_ops = tcm_vhost_ops;
-	/*
-	 * Setup default attribute lists for various fabric->tf_cit_tmpl
-	 */
-	TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
-	TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
-	TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
-	TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
-	TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
-	TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
-	TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
-	TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
-	TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
-	/*
-	 * Register the fabric for use within TCM
-	 */
-	ret = target_fabric_configfs_register(fabric);
-	if (ret < 0) {
-		pr_err("target_fabric_configfs_register() failed"
-				" for TCM_VHOST\n");
-		return ret;
-	}
-	/*
-	 * Setup our local pointer to *fabric
-	 */
-	tcm_vhost_fabric_configfs = fabric;
-	pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
-	return 0;
-};
-
-static void tcm_vhost_deregister_configfs(void)
-{
-	if (!tcm_vhost_fabric_configfs)
-		return;
-
-	target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
-	tcm_vhost_fabric_configfs = NULL;
-	pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
-};
-
-static int __init tcm_vhost_init(void)
-{
-	int ret = -ENOMEM;
-	/*
-	 * Use our own dedicated workqueue for submitting I/O into
-	 * target core to avoid contention within system_wq.
-	 */
-	tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
-	if (!tcm_vhost_workqueue)
-		goto out;
-
-	ret = vhost_scsi_register();
-	if (ret < 0)
-		goto out_destroy_workqueue;
-
-	ret = tcm_vhost_register_configfs();
-	if (ret < 0)
-		goto out_vhost_scsi_deregister;
-
-	return 0;
-
-out_vhost_scsi_deregister:
-	vhost_scsi_deregister();
-out_destroy_workqueue:
-	destroy_workqueue(tcm_vhost_workqueue);
-out:
-	return ret;
-};
-
-static void tcm_vhost_exit(void)
-{
-	tcm_vhost_deregister_configfs();
-	vhost_scsi_deregister();
-	destroy_workqueue(tcm_vhost_workqueue);
-};
-
-MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
-MODULE_LICENSE("GPL");
-module_init(tcm_vhost_init);
-module_exit(tcm_vhost_exit);