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scsi: iscsi: Add helper functions to manage iscsi_cls_conn

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- 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>
This commit is contained in:
Wenchao Hao 2022-03-09 20:57:57 -05:00 • committed by Martin K. Petersen
parent e1b353e7a3
commit ad515cada7
2 changed files with 101 additions and 0 deletions
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97
drivers/scsi/scsi_transport_iscsi.c
View file

@ -2317,6 +2317,103 @@ 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

4
include/scsi/scsi_transport_iscsi.h
View file

@ -442,6 +442,10 @@ extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
unsigned int target_id);
extern void iscsi_remove_session(struct iscsi_cls_session *session);
extern void iscsi_free_session(struct iscsi_cls_session *session);
extern struct iscsi_cls_conn *iscsi_alloc_conn(struct iscsi_cls_session *sess,
int dd_size, uint32_t cid);
extern int iscsi_add_conn(struct iscsi_cls_conn *conn);
extern void iscsi_remove_conn(struct iscsi_cls_conn *conn);
extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
int dd_size, uint32_t cid);
extern void iscsi_put_conn(struct iscsi_cls_conn *conn);