From: Wenchao Hao haowenchao@huawei.com

mainline inclusion from mainline-v5.18-rc1 commit ad515cada7dac3cdf5e1ad77a0ed696f5f34e0ab category: bugfix bugzilla: 187381, https://gitee.com/openeuler/kernel/issues/I5LBFL CVE: NA

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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

Conflict: drivers/scsi/scsi_transport_iscsi.c Signed-off-by: Yu Kuai yukuai3@huawei.com Reviewed-by: Jason Yan yanaijie@huawei.com Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- drivers/scsi/scsi_transport_iscsi.c | 89 +++++++++++++++++++++++++++++ include/scsi/scsi_transport_iscsi.h | 4 ++ 2 files changed, 93 insertions(+)

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index bd699906828f..eba74ac58735 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -2201,6 +2201,95 @@ 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); + conn->transport = transport; + conn->cid = cid; + + /* 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; + } + transport_register_device(&conn->dev); + + 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 diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h index 848ba2822a21..105458b20cd8 100644 --- a/include/scsi/scsi_transport_iscsi.h +++ b/include/scsi/scsi_transport_iscsi.h @@ -446,6 +446,10 @@ 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);