[SCSI] iscsi_transport: Modidify recovery_tmo from sysfs

Added support to modify session->recovery_tmo from sysfs

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Acked-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 38 insertions, 5 deletions

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index b9aec304872c..d4b96623aa59 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1783,14 +1783,42 @@ show_priv_session_##field(struct device *dev, 				\
 {                                                                       \
         struct iscsi_cls_session *session =                             \
                         iscsi_dev_to_session(dev->parent);              \
+        if (session->field == -1)                                       \
+                return sprintf(buf, "off\n");                           \
         return sprintf(buf, format"\n", session->field);                \
 }
 
-#define iscsi_priv_session_attr(field, format)                          \
+#define iscsi_priv_session_attr_store(field)                            \
+static ssize_t                                                          \
+store_priv_session_##field(struct device *dev,                          \
+                           struct device_attribute *attr,               \
+                           const char *buf, size_t count)               \
+{                                                                       \
+        int val;                                                        \
+        char *cp;                                                       \
+        struct iscsi_cls_session *session =                             \
+                iscsi_dev_to_session(dev->parent);                      \
+        if ((session->state == ISCSI_SESSION_FREE) ||                   \
+            (session->state == ISCSI_SESSION_FAILED))                   \
+                return -EBUSY;                                          \
+        if (strncmp(buf, "off", 3) == 0)                                \
+                session->field = -1;                                    \
+        else {                                                          \
+                val = simple_strtoul(buf, &cp, 0);                      \
+                if (*cp != '\0' && *cp != '\n')                         \
+                        return -EINVAL;                                 \
+                session->field = val;                                   \
+        }                                                               \
+        return count;                                                   \
+}
+
+#define iscsi_priv_session_rw_attr(field, format)                       \
         iscsi_priv_session_attr_show(field, format)                     \
-static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
-                        NULL)
-iscsi_priv_session_attr(recovery_tmo, "%d");
+        iscsi_priv_session_attr_store(field)                            \
+static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUGO,            \
+                        show_priv_session_##field,                      \
+                        store_priv_session_##field)
+iscsi_priv_session_rw_attr(recovery_tmo, "%d");
 
 /*
  * iSCSI host attrs
@@ -1821,6 +1849,11 @@ do {									\
         count++;                                                        \
 } while (0)
 
+#define SETUP_PRIV_SESSION_RW_ATTR(field)                               \
+do {                                                                    \
+        priv->session_attrs[count] = &dev_attr_priv_sess_##field;       \
+        count++;                                                        \
+} while (0)
 
 #define SETUP_SESSION_RD_ATTR(field, param_flag)                        \
 do {                                                                    \
@@ -2008,7 +2041,7 @@ iscsi_register_transport(struct iscsi_transport *tt)
         SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
         SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
         SETUP_SESSION_RD_ATTR(targetalias, ISCSI_TARGET_ALIAS);
-        SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
+        SETUP_PRIV_SESSION_RW_ATTR(recovery_tmo);
         SETUP_PRIV_SESSION_RD_ATTR(state);
 
         BUG_ON(count > ISCSI_SESSION_ATTRS);