[SCSI] iscsi class, libiscsi: add iscsi sysfs session state file

This adds a iscsi session state file which exports the session
state for both software and hardware iscsi. It also hooks libiscsi
in.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

2 files changed, 31 insertions, 15 deletions

diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 71eda24114e9..278011fb3c2f 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -135,6 +135,14 @@ static inline void* iscsi_next_hdr(struct iscsi_cmd_task *ctask)
         return (void*)ctask->hdr + ctask->hdr_len;
 }
 
+/* Connection's states */
+enum {
+        ISCSI_CONN_INITIAL_STAGE,
+        ISCSI_CONN_STARTED,
+        ISCSI_CONN_STOPPED,
+        ISCSI_CONN_CLEANUP_WAIT,
+};
+
 struct iscsi_conn {
         struct iscsi_cls_conn   *cls_conn;      /* ptr to class connection */
         void                    *dd_data;       /* iscsi_transport data */
@@ -227,6 +235,17 @@ struct iscsi_pool {
         int                     max;            /* Max number of elements */
 };
 
+/* Session's states */
+enum {
+        ISCSI_STATE_FREE = 1,
+        ISCSI_STATE_LOGGED_IN,
+        ISCSI_STATE_FAILED,
+        ISCSI_STATE_TERMINATE,
+        ISCSI_STATE_IN_RECOVERY,
+        ISCSI_STATE_RECOVERY_FAILED,
+        ISCSI_STATE_LOGGING_OUT,
+};
+
 struct iscsi_session {
         /*
          * Syncs up the scsi eh thread with the iscsi eh thread when sending
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 404f11d331d6..0e869d9a3856 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -149,13 +149,6 @@ extern void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error);
 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
                           char *data, uint32_t data_size);
 
-
-/* Connection's states */
-#define ISCSI_CONN_INITIAL_STAGE        0
-#define ISCSI_CONN_STARTED              1
-#define ISCSI_CONN_STOPPED              2
-#define ISCSI_CONN_CLEANUP_WAIT         3
-
 struct iscsi_cls_conn {
         struct list_head conn_list;     /* item in connlist */
         void *dd_data;                  /* LLD private data */
@@ -169,19 +162,21 @@ struct iscsi_cls_conn {
 #define iscsi_dev_to_conn(_dev) \
         container_of(_dev, struct iscsi_cls_conn, dev)
 
-/* Session's states */
-#define ISCSI_STATE_FREE                1
-#define ISCSI_STATE_LOGGED_IN           2
-#define ISCSI_STATE_FAILED              3
-#define ISCSI_STATE_TERMINATE           4
-#define ISCSI_STATE_IN_RECOVERY         5
-#define ISCSI_STATE_RECOVERY_FAILED     6
-#define ISCSI_STATE_LOGGING_OUT         7
+#define iscsi_conn_to_session(_conn) \
+        iscsi_dev_to_session(_conn->dev.parent)
+
+/* iscsi class session state */
+enum {
+        ISCSI_SESSION_LOGGED_IN,
+        ISCSI_SESSION_FAILED,
+        ISCSI_SESSION_FREE,
+};
 
 struct iscsi_cls_session {
         struct list_head sess_list;             /* item in session_list */
         struct list_head host_list;
         struct iscsi_transport *transport;
+        spinlock_t lock;
 
         /* recovery fields */
         int recovery_tmo;
@@ -190,6 +185,7 @@ struct iscsi_cls_session {
 
         int target_id;
 
+        int state;
         int sid;                                /* session id */
         void *dd_data;                          /* LLD private data */
         struct device dev;      /* sysfs transport/container device */
@@ -214,6 +210,7 @@ struct iscsi_host {
 /*
  * session and connection functions that can be used by HW iSCSI LLDs
  */
+extern int iscsi_session_chkready(struct iscsi_cls_session *session);
 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
                                         struct iscsi_transport *transport);
 extern int iscsi_add_session(struct iscsi_cls_session *session,