[SCSI] iscsi_tcp: add new conn error to indicate tcp conn closed

If a target closed the connection, we will detect it in the
state_changed or data_ready callout. This adds a new conn
error value to use for this problem, so it is not confused
with when the initiator throws a conn error and drops
the connection.

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

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index c7e2ff2..2b1b834 100644 (file)
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -109,11 +109,14 @@ static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
  */
 static inline int iscsi_sw_sk_state_check(struct sock *sk)
 {
-       if ((sk->sk_state == TCP_CLOSE_WAIT ||
-            sk->sk_state == TCP_CLOSE) &&
-           !atomic_read(&sk->sk_rmem_alloc))
-               return -ECONNRESET;
+       struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
 
+       if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
+           !atomic_read(&sk->sk_rmem_alloc)) {
+               ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
+               iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
+               return -ECONNRESET;
+       }
        return 0;
 }
 
@@ -135,11 +138,7 @@ static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
        rd_desc.count = 1;
        tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
 
-       if (iscsi_sw_sk_state_check(sk) < 0) {
-               ISCSI_SW_TCP_DBG(conn, "iscsi_tcp_data_ready: "
-                                "TCP_CLOSE|TCP_CLOSE_WAIT\n");
-               iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-       }
+       iscsi_sw_sk_state_check(sk);
 
        read_unlock(&sk->sk_callback_lock);
 
@@ -161,11 +160,7 @@ static void iscsi_sw_tcp_state_change(struct sock *sk)
        conn = (struct iscsi_conn*)sk->sk_user_data;
        session = conn->session;
 
-       if (iscsi_sw_sk_state_check(sk) < 0) {
-               ISCSI_SW_TCP_DBG(conn, "iscsi_tcp_state_change: "
-                                "TCP_CLOSE|TCP_CLOSE_WAIT\n");
-               iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-       }
+       iscsi_sw_sk_state_check(sk);
 
        tcp_conn = conn->dd_data;
        tcp_sw_conn = tcp_conn->dd_data;

diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index 4426f00..d67dda2 100644 (file)
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -262,6 +262,7 @@ enum iscsi_err {
        ISCSI_ERR_NO_SCSI_CMD           = ISCSI_ERR_BASE + 17,
        ISCSI_ERR_INVALID_HOST          = ISCSI_ERR_BASE + 18,
        ISCSI_ERR_XMIT_FAILED           = ISCSI_ERR_BASE + 19,
+       ISCSI_ERR_TCP_CONN_CLOSE        = ISCSI_ERR_BASE + 20,
 };
 
 /*