[SCSI] iscsi class, iscsi_tcp, ib_iser: add sysfs chap file

The attached patches add sysfs files for the chap settings
to the iscsi transport class, iscsi_tcp and ib_iser. This is
needed for software iscsi because there are times when iscsid
can die and it will need to reread the values it was using.
And it is needed by qla4xxx for basic management opertaions.
This patch does not hook in qla4xxx yet, because I am not sure
the mbx command to use.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: Roland Dreier <rdreier@cisco.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 68 insertions, 16 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index b2827d112cb..1e722f5aabd 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -2186,8 +2186,9 @@ static struct iscsi_transport iscsi_tcp_transport = {
 				  ISCSI_EXP_STATSN |
 				  ISCSI_PERSISTENT_PORT |
 				  ISCSI_PERSISTENT_ADDRESS |
-				  ISCSI_TARGET_NAME |
-				  ISCSI_TPGT,
+				  ISCSI_TARGET_NAME | ISCSI_TPGT |
+				  ISCSI_USERNAME | ISCSI_PASSWORD |
+				  ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN,
 	.host_param_mask	= ISCSI_HOST_HWADDRESS |
 				  ISCSI_HOST_INITIATOR_NAME,
 	.host_template		= &iscsi_sht,
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 0a9c64e9ce8..63981edf9ab 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1461,6 +1461,10 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
 	iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
 	iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
 
+	kfree(session->password);
+	kfree(session->password_in);
+	kfree(session->username);
+	kfree(session->username_in);
 	kfree(session->targetname);
 	kfree(session->hwaddress);
 	kfree(session->initiatorname);
@@ -1869,6 +1873,30 @@ int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
 	case ISCSI_PARAM_EXP_STATSN:
 		sscanf(buf, "%u", &conn->exp_statsn);
 		break;
+	case ISCSI_PARAM_USERNAME:
+		kfree(session->username);
+		session->username = kstrdup(buf, GFP_KERNEL);
+		if (!session->username)
+			return -ENOMEM;
+		break;
+	case ISCSI_PARAM_USERNAME_IN:
+		kfree(session->username_in);
+		session->username_in = kstrdup(buf, GFP_KERNEL);
+		if (!session->username_in)
+			return -ENOMEM;
+		break;
+	case ISCSI_PARAM_PASSWORD:
+		kfree(session->password);
+		session->password = kstrdup(buf, GFP_KERNEL);
+		if (!session->password)
+			return -ENOMEM;
+		break;
+	case ISCSI_PARAM_PASSWORD_IN:
+		kfree(session->password_in);
+		session->password_in = kstrdup(buf, GFP_KERNEL);
+		if (!session->password_in)
+			return -ENOMEM;
+		break;
 	case ISCSI_PARAM_TARGET_NAME:
 		/* this should not change between logins */
 		if (session->targetname)
@@ -1942,6 +1970,18 @@ int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
 	case ISCSI_PARAM_TPGT:
 		len = sprintf(buf, "%d\n", session->tpgt);
 		break;
+	case ISCSI_PARAM_USERNAME:
+		len = sprintf(buf, "%s\n", session->username);
+		break;
+	case ISCSI_PARAM_USERNAME_IN:
+		len = sprintf(buf, "%s\n", session->username_in);
+		break;
+	case ISCSI_PARAM_PASSWORD:
+		len = sprintf(buf, "%s\n", session->password);
+		break;
+	case ISCSI_PARAM_PASSWORD_IN:
+		len = sprintf(buf, "%s\n", session->password_in);
+		break;
 	default:
 		return -ENOSYS;
 	}
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 5ec2fbea893..341d4fb5c6f 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -30,7 +30,7 @@
 #include <scsi/scsi_transport_iscsi.h>
 #include <scsi/iscsi_if.h>
 
-#define ISCSI_SESSION_ATTRS 11
+#define ISCSI_SESSION_ATTRS 15
 #define ISCSI_CONN_ATTRS 11
 #define ISCSI_HOST_ATTRS 2
 #define ISCSI_TRANSPORT_VERSION "2.0-724"
@@ -1196,30 +1196,37 @@ iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
 /*
  * iSCSI session attrs
  */
-#define iscsi_session_attr_show(param)					\
+#define iscsi_session_attr_show(param, perm)				\
 static ssize_t								\
 show_session_param_##param(struct class_device *cdev, char *buf)	\
 {									\
 	struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
 	struct iscsi_transport *t = session->transport;			\
+									\
+	if (perm && !capable(CAP_SYS_ADMIN))				\
+		return -EACCES;						\
 	return t->get_session_param(session, param, buf);		\
 }
 
-#define iscsi_session_attr(field, param)				\
-	iscsi_session_attr_show(param)					\
+#define iscsi_session_attr(field, param, perm)				\
+	iscsi_session_attr_show(param, perm)				\
 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
 			NULL);
 
-iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME);
-iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN);
-iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T);
-iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN);
-iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST);
-iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST);
-iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN);
-iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN);
-iscsi_session_attr(erl, ISCSI_PARAM_ERL);
-iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT);
+iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
+iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
+iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
+iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
+iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
+iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
+iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
+iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
+iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
+iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
+iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
+iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
+iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
+iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
 
 #define iscsi_priv_session_attr_show(field, format)			\
 static ssize_t								\
@@ -1433,6 +1440,10 @@ iscsi_register_transport(struct iscsi_transport *tt)
 	SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
 	SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
 	SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
+	SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
+	SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
+	SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
+	SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
 	SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
 
 	BUG_ON(count > ISCSI_SESSION_ATTRS);