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authorWenchao Hao <haowenchao@huawei.com>2022-03-10 04:57:57 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2022-03-15 07:19:50 +0300
commitad515cada7dac3cdf5e1ad77a0ed696f5f34e0ab (patch)
tree9547702575aadff819a99128788e7cf5bd47d939 /drivers/scsi/scsi_transport_iscsi.c
parente1b353e7a31dcaf47c234812c46a2db9cd5be584 (diff)
downloadlinux-ad515cada7dac3cdf5e1ad77a0ed696f5f34e0ab.tar.xz
scsi: iscsi: Add helper functions to manage iscsi_cls_conn
- iscsi_alloc_conn(): Allocate and initialize iscsi_cls_conn - iscsi_add_conn(): Expose iscsi_cls_conn to userspace via sysfs - iscsi_remove_conn(): Remove iscsi_cls_conn from sysfs Link: https://lore.kernel.org/r/20220310015759.3296841-2-haowenchao@huawei.com Reviewed-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Wenchao Hao <haowenchao@huawei.com> Signed-off-by: Wu Bo <wubo40@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_transport_iscsi.c')
-rw-r--r--drivers/scsi/scsi_transport_iscsi.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 754277bec63a..fe586336591b 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -2318,6 +2318,103 @@ void iscsi_free_session(struct iscsi_cls_session *session)
EXPORT_SYMBOL_GPL(iscsi_free_session);
/**
+ * iscsi_alloc_conn - alloc iscsi class connection
+ * @session: iscsi cls session
+ * @dd_size: private driver data size
+ * @cid: connection id
+ */
+struct iscsi_cls_conn *
+iscsi_alloc_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
+{
+ struct iscsi_transport *transport = session->transport;
+ struct iscsi_cls_conn *conn;
+
+ conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
+ if (!conn)
+ return NULL;
+ if (dd_size)
+ conn->dd_data = &conn[1];
+
+ mutex_init(&conn->ep_mutex);
+ INIT_LIST_HEAD(&conn->conn_list);
+ INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
+ conn->transport = transport;
+ conn->cid = cid;
+ conn->state = ISCSI_CONN_DOWN;
+
+ /* this is released in the dev's release function */
+ if (!get_device(&session->dev))
+ goto free_conn;
+
+ dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
+ device_initialize(&conn->dev);
+ conn->dev.parent = &session->dev;
+ conn->dev.release = iscsi_conn_release;
+
+ return conn;
+
+free_conn:
+ kfree(conn);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(iscsi_alloc_conn);
+
+/**
+ * iscsi_add_conn - add iscsi class connection
+ * @conn: iscsi cls connection
+ *
+ * This will expose iscsi_cls_conn to sysfs so make sure the related
+ * resources for sysfs attributes are initialized before calling this.
+ */
+int iscsi_add_conn(struct iscsi_cls_conn *conn)
+{
+ int err;
+ unsigned long flags;
+ struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent);
+
+ err = device_add(&conn->dev);
+ if (err) {
+ iscsi_cls_session_printk(KERN_ERR, session,
+ "could not register connection's dev\n");
+ return err;
+ }
+ err = transport_register_device(&conn->dev);
+ if (err) {
+ iscsi_cls_session_printk(KERN_ERR, session,
+ "could not register transport's dev\n");
+ device_del(&conn->dev);
+ return err;
+ }
+
+ spin_lock_irqsave(&connlock, flags);
+ list_add(&conn->conn_list, &connlist);
+ spin_unlock_irqrestore(&connlock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iscsi_add_conn);
+
+/**
+ * iscsi_remove_conn - remove iscsi class connection from sysfs
+ * @conn: iscsi cls connection
+ *
+ * Remove iscsi_cls_conn from sysfs, and wait for previous
+ * read/write of iscsi_cls_conn's attributes in sysfs to finish.
+ */
+void iscsi_remove_conn(struct iscsi_cls_conn *conn)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&connlock, flags);
+ list_del(&conn->conn_list);
+ spin_unlock_irqrestore(&connlock, flags);
+
+ transport_unregister_device(&conn->dev);
+ device_del(&conn->dev);
+}
+EXPORT_SYMBOL_GPL(iscsi_remove_conn);
+
+/**
* iscsi_create_conn - create iscsi class connection
* @session: iscsi cls session
* @dd_size: private driver data size