From 84d335f1317f6e3121896ff97d82da36dd7fc4c5 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@acm.org>
Date: Sat, 14 Aug 2021 03:24:11 +0000
Subject: [PATCH] scst_local: Make the SCSI host number available in sysfs

An example for the following SCST configuration:

TARGET_DRIVER scst_local {
	TARGET scst_local_tgt {
		session_name scst_local_host

		LUN 0 dummy
		LUN 1 test1
		LUN 2 test2
	}
}

$ cat /sys/kernel/scst_tgt/targets/scst_local/scst_local_tgt/sessions/scst_local_host/host_no
9


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@9488 d57e44dd-8a1f-0410-8b47-8ef2f437770f
---
 scst_local/scst_local.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/scst_local/scst_local.c b/scst_local/scst_local.c
index df20874d2..34d9727e8 100644
--- a/scst_local/scst_local.c
+++ b/scst_local/scst_local.c
@@ -483,6 +483,19 @@ static const struct attribute *scst_local_tgt_attrs[] = {
  ** Session attributes
  **/
 
+static ssize_t host_no_show(struct kobject *kobj,
+	struct kobj_attribute *attr, char *buf)
+{
+	struct scst_session *scst_sess =
+		container_of(kobj, struct scst_session, sess_kobj);
+	struct scst_local_sess *sess = scst_sess_get_tgt_priv(scst_sess);
+	struct Scsi_Host *host = sess->shost;
+
+	return host ? snprintf(buf, PAGE_SIZE, "%u\n", host->host_no) : -EINVAL;
+}
+
+static struct kobj_attribute scst_local_host_no_attr = __ATTR_RO(host_no);
+
 static ssize_t scst_local_transport_id_show(struct kobject *kobj,
 	struct kobj_attribute *attr, char *buf)
 {
@@ -571,6 +584,7 @@ static struct kobj_attribute scst_local_transport_id_attr =
 		scst_local_transport_id_store);
 
 static const struct attribute *scst_local_sess_attrs[] = {
+	&scst_local_host_no_attr.attr,
 	&scst_local_transport_id_attr.attr,
 	NULL,
 };