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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/include/scsi/scsi_transport_iscsi.h
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * iSCSI transport class definitions
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  *
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@@ -5,20 +6,6 @@
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  * Copyright (C) Mike Christie, 2004 - 2006
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  * Copyright (C) Dmitry Yusupov, 2004 - 2005
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  * Copyright (C) Alex Aizman, 2004 - 2005
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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  */
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 #ifndef SCSI_TRANSPORT_ISCSI_H
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 #define SCSI_TRANSPORT_ISCSI_H
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  *			When not offloading the data path, this is called
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  *			from the scsi work queue without the session lock.
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  * @xmit_task		Requests LLD to transfer cmd task. Returns 0 or the
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- *			the number of bytes transferred on success, and -Exyz
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+ *			number of bytes transferred on success, and -Exyz
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  *			value on error. When offloading the data path, this
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  *			is called from queuecommand with the session lock, or
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  *			from the iscsi_conn_send_pdu context with the session
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 	void (*destroy_session) (struct iscsi_cls_session *session);
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 	struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
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 				uint32_t cid);
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+	void (*unbind_conn) (struct iscsi_cls_conn *conn, bool is_active);
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 	int (*bind_conn) (struct iscsi_cls_session *session,
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 			  struct iscsi_cls_conn *cls_conn,
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 			  uint64_t transport_eph, int is_leading);
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 				  uint32_t status, uint32_t pid,
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 				  uint32_t data_size, uint8_t *data);
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+/* iscsi class connection state */
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+enum iscsi_connection_state {
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+	ISCSI_CONN_UP = 0,
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+	ISCSI_CONN_DOWN,
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+	ISCSI_CONN_FAILED,
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+	ISCSI_CONN_BOUND,
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+};
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+
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+#define ISCSI_CLS_CONN_BIT_CLEANUP	1
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+
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 struct iscsi_cls_conn {
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 	struct list_head conn_list;	/* item in connlist */
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 	void *dd_data;			/* LLD private data */
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 	struct iscsi_transport *transport;
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 	uint32_t cid;			/* connection id */
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+	/*
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+	 * This protects the conn startup and binding/unbinding of the ep to
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+	 * the conn. Unbinding includes ep_disconnect and stop_conn.
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+	 */
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 	struct mutex ep_mutex;
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 	struct iscsi_endpoint *ep;
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+	/* Used when accessing flags and queueing work. */
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+	spinlock_t lock;
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+	unsigned long flags;
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+	struct work_struct cleanup_work;
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+
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 	struct device dev;		/* sysfs transport/container device */
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+	enum iscsi_connection_state state;
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 };
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 #define iscsi_dev_to_conn(_dev) \
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 	ISCSI_SESSION_FREE,
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 };
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+enum {
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+	ISCSI_SESSION_TARGET_UNBOUND,
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+	ISCSI_SESSION_TARGET_ALLOCATED,
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+	ISCSI_SESSION_TARGET_SCANNED,
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+	ISCSI_SESSION_TARGET_UNBINDING,
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+	ISCSI_SESSION_TARGET_MAX,
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+};
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+
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 #define ISCSI_MAX_TARGET -1
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 struct iscsi_cls_session {
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 	struct work_struct unblock_work;
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 	struct work_struct scan_work;
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 	struct work_struct unbind_work;
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+	struct work_struct destroy_work;
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 	/* recovery fields */
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 	int recovery_tmo;
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 	 */
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 	pid_t creator;
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 	int state;
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+	int target_state;			/* session target bind state */
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 	int sid;				/* session id */
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 	void *dd_data;				/* LLD private data */
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 	struct device dev;	/* sysfs transport/container device */
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 extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
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 extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
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 extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
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+extern void iscsi_put_endpoint(struct iscsi_endpoint *ep);
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 extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd);
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 extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost,
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 					      struct iscsi_transport *t,