Re: [PATCH-for-4.6 3/6] vhost/scsi: Convert to target_alloc_session usage

[Michael S. Tsirkin]

On Sun, Jan 10, 2016 at 08:44:25PM +0000, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
> 
> Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>

Pls merge this patch yourself to avoid dependency issues.

> ---
>  drivers/vhost/scsi.c | 99 ++++++++++++++++++++++------------------------------
>  1 file changed, 41 insertions(+), 58 deletions(-)
> 
> diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
> index 29cfc57..cd5f20f 100644
> --- a/drivers/vhost/scsi.c
> +++ b/drivers/vhost/scsi.c
> @@ -1664,8 +1664,7 @@ static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
>  	mutex_unlock(&vhost_scsi_mutex);
>  }
>  
> -static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus,
> -				       struct se_session *se_sess)
> +static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess)
>  {
>  	struct vhost_scsi_cmd *tv_cmd;
>  	unsigned int i;
> @@ -1721,98 +1720,82 @@ static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
>  	NULL,
>  };
>  
> -static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
> -				const char *name)
> +static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg,
> +			       struct se_session *se_sess, void *p)
>  {
> -	struct se_portal_group *se_tpg;
> -	struct se_session *se_sess;
> -	struct vhost_scsi_nexus *tv_nexus;
>  	struct vhost_scsi_cmd *tv_cmd;
>  	unsigned int i;
>  
> -	mutex_lock(&tpg->tv_tpg_mutex);
> -	if (tpg->tpg_nexus) {
> -		mutex_unlock(&tpg->tv_tpg_mutex);
> -		pr_debug("tpg->tpg_nexus already exists\n");
> -		return -EEXIST;
> -	}
> -	se_tpg = &tpg->se_tpg;
> -
> -	tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
> -	if (!tv_nexus) {
> -		mutex_unlock(&tpg->tv_tpg_mutex);
> -		pr_err("Unable to allocate struct vhost_scsi_nexus\n");
> -		return -ENOMEM;
> -	}
> -	/*
> -	 *  Initialize the struct se_session pointer and setup tagpool
> -	 *  for struct vhost_scsi_cmd descriptors
> -	 */
> -	tv_nexus->tvn_se_sess = transport_init_session_tags(
> -					VHOST_SCSI_DEFAULT_TAGS,
> -					sizeof(struct vhost_scsi_cmd),
> -					TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
> -	if (IS_ERR(tv_nexus->tvn_se_sess)) {
> -		mutex_unlock(&tpg->tv_tpg_mutex);
> -		kfree(tv_nexus);
> -		return -ENOMEM;
> -	}
> -	se_sess = tv_nexus->tvn_se_sess;
>  	for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
>  		tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
>  
>  		tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
>  					VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
>  		if (!tv_cmd->tvc_sgl) {
> -			mutex_unlock(&tpg->tv_tpg_mutex);
>  			pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
>  			goto out;
>  		}
>  
>  		tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
> -					VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
> +				VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
>  		if (!tv_cmd->tvc_upages) {
> -			mutex_unlock(&tpg->tv_tpg_mutex);
>  			pr_err("Unable to allocate tv_cmd->tvc_upages\n");
>  			goto out;
>  		}
>  
>  		tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
> -					VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
> +				VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
>  		if (!tv_cmd->tvc_prot_sgl) {
> -			mutex_unlock(&tpg->tv_tpg_mutex);
>  			pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
>  			goto out;
>  		}
>  	}
> +	return 0;
> +out:
> +	vhost_scsi_free_cmd_map_res(se_sess);
> +	return -ENOMEM;
> +}
> +
> +static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
> +				const char *name)
> +{
> +	struct se_portal_group *se_tpg;
> +	struct vhost_scsi_nexus *tv_nexus;
> +
> +	mutex_lock(&tpg->tv_tpg_mutex);
> +	if (tpg->tpg_nexus) {
> +		mutex_unlock(&tpg->tv_tpg_mutex);
> +		pr_debug("tpg->tpg_nexus already exists\n");
> +		return -EEXIST;
> +	}
> +	se_tpg = &tpg->se_tpg;
> +
> +	tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
> +	if (!tv_nexus) {
> +		mutex_unlock(&tpg->tv_tpg_mutex);
> +		pr_err("Unable to allocate struct vhost_scsi_nexus\n");
> +		return -ENOMEM;
> +	}
>  	/*
>  	 * Since we are running in 'demo mode' this call with generate a
>  	 * struct se_node_acl for the vhost_scsi 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) {
> +	tv_nexus->tvn_se_sess = target_alloc_session(&tpg->se_tpg,
> +					VHOST_SCSI_DEFAULT_TAGS,
> +					sizeof(struct vhost_scsi_cmd),
> +					TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
> +					(unsigned char *)name, tv_nexus,
> +					vhost_scsi_nexus_cb);
> +	if (IS_ERR(tv_nexus->tvn_se_sess)) {
>  		mutex_unlock(&tpg->tv_tpg_mutex);
> -		pr_debug("core_tpg_check_initiator_node_acl() failed"
> -				" for %s\n", name);
> -		goto out;
> +		kfree(tv_nexus);
> +		return -ENOMEM;
>  	}
> -	/*
> -	 * Now register the TCM vhost virtual I_T Nexus as active.
> -	 */
> -	transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
> -			tv_nexus->tvn_se_sess, tv_nexus);
>  	tpg->tpg_nexus = tv_nexus;
>  
>  	mutex_unlock(&tpg->tv_tpg_mutex);
>  	return 0;
> -
> -out:
> -	vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
> -	transport_free_session(se_sess);
> -	kfree(tv_nexus);
> -	return -ENOMEM;
>  }
>  
>  static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
> @@ -1853,7 +1836,7 @@ static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
>  		" %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
>  		tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
>  
> -	vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
> +	vhost_scsi_free_cmd_map_res(se_sess);
>  	/*
>  	 * Release the SCSI I_T Nexus to the emulated vhost Target Port
>  	 */
> -- 
> 1.9.1