socket: add iscsi_out_queue_length() function

This function allows the caller to determine the number of PDUs queued
for transmission for a given iscsi context.

Signed-off-by: David Disseldorp <ddiss@suse.de>

include/iscsi.h

@@ -82,6 +82,11 @@ EXTERN int iscsi_service(struct iscsi_context *iscsi, int revents);
  * How many commands are in flight.
  */
 EXTERN int iscsi_queue_length(struct iscsi_context *iscsi);
+/*
+ * How many commands are queued for dispatch.
+ */
+EXTERN int iscsi_out_queue_length(struct iscsi_context *iscsi);
+
 
 /************************************************************
  * Timeout Handling.

lib/libiscsi.def

@@ -46,6 +46,7 @@ iscsi_prefetch16_task
 iscsi_preventallow_sync
 iscsi_preventallow_task
 iscsi_queue_length
+iscsi_out_queue_length
 iscsi_queue_pdu
 iscsi_read10_sync
 iscsi_read10_task

lib/libiscsi.syms

@@ -44,6 +44,7 @@ iscsi_prefetch16_task
 iscsi_preventallow_sync
 iscsi_preventallow_task
 iscsi_queue_length
+iscsi_out_queue_length
 iscsi_queue_pdu
 iscsi_read10_sync
 iscsi_read10_task

lib/socket.c

@@ -439,6 +439,19 @@ iscsi_queue_length(struct iscsi_context *iscsi)
 	return i;
 }
 
+int
+iscsi_out_queue_length(struct iscsi_context *iscsi)
+{
+	int i = 0;
+	struct iscsi_pdu *pdu;
+
+	for (pdu = iscsi->outqueue; pdu; pdu = pdu->next) {
+		i++;
+	}
+
+	return i;
+}
+
 ssize_t
 iscsi_iovector_readv_writev(struct iscsi_context *iscsi, struct scsi_iovector *iovector, uint32_t pos, ssize_t count, int do_write)
 {