text: /* SPDX-License-Identifier: GPL-2.0 */
  #ifndef TARGET_CORE_BASE_H
  #define TARGET_CORE_BASE_H
  
  #include <linux/configfs.h>      /* struct config_group */
  #include <linux/dma-direction.h> /* enum dma_data_direction */
  #include <linux/sbitmap.h>
  #include <linux/percpu-refcount.h>
  #include <linux/semaphore.h>     /* struct semaphore */
  #include <linux/completion.h>
  
  #define TARGET_CORE_VERSION		"v5.0"
  
  /*
   * Maximum size of a CDB that can be stored in se_cmd without allocating
   * memory dynamically for the CDB.
   */
  #define TCM_MAX_COMMAND_SIZE			32
  /*
   * From include/scsi/scsi_cmnd.h:SCSI_SENSE_BUFFERSIZE, currently
   * defined 96, but the real limit is 252 (or 260 including the header)
   */
  #define TRANSPORT_SENSE_BUFFER			96
  /* Used by transport_send_check_condition_and_sense() */
  #define SPC_SENSE_KEY_OFFSET			2
  #define SPC_ADD_SENSE_LEN_OFFSET		7
  #define SPC_DESC_TYPE_OFFSET			8
  #define SPC_ADDITIONAL_DESC_LEN_OFFSET		9
  #define SPC_VALIDITY_OFFSET			10
  #define SPC_ASC_KEY_OFFSET			12
  #define SPC_ASCQ_KEY_OFFSET			13
  #define TRANSPORT_IQN_LEN			224
  /* Used by target_core_store_alua_lu_gp() and target_core_alua_lu_gp_show_attr_members() */
  #define LU_GROUP_NAME_BUF			256
  /* Used by core_alua_store_tg_pt_gp_info() and target_core_alua_tg_pt_gp_show_attr_members() */
  #define TG_PT_GROUP_NAME_BUF			256
  /* Used to parse VPD into struct t10_vpd */
  #define VPD_TMP_BUF_SIZE			254
  /* Used by transport_generic_cmd_sequencer() */
  #define READ_BLOCK_LEN          		6
  #define READ_CAP_LEN            		8
  #define READ_POSITION_LEN       		20
  #define INQUIRY_LEN				36
  /* Used by transport_get_inquiry_vpd_serial() */
  #define INQUIRY_VPD_SERIAL_LEN			254
  /* Used by transport_get_inquiry_vpd_device_ident() */
  #define INQUIRY_VPD_DEVICE_IDENTIFIER_LEN	254
  
  #define INQUIRY_VENDOR_LEN			8
  #define INQUIRY_MODEL_LEN			16
  #define INQUIRY_REVISION_LEN			4
  
  /* Attempts before moving from SHORT to LONG */
  #define PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD	3
  #define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT	3  /* In milliseconds */
  #define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG	10 /* In milliseconds */
  
  #define PYX_TRANSPORT_STATUS_INTERVAL		5 /* In seconds */
  
  /* struct se_dev_attrib sanity values */
  /* Default max_unmap_lba_count */
  #define DA_MAX_UNMAP_LBA_COUNT			0
  /* Default max_unmap_block_desc_count */
  #define DA_MAX_UNMAP_BLOCK_DESC_COUNT		0
  /* Default unmap_granularity */
  #define DA_UNMAP_GRANULARITY_DEFAULT		0
  /* Default unmap_granularity_alignment */
  #define DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT	0
  /* Default unmap_zeroes_data */
  #define DA_UNMAP_ZEROES_DATA_DEFAULT		0
  /* Default max_write_same_len, disabled by default */
  #define DA_MAX_WRITE_SAME_LEN			0
  /* Use a model alias based on the configfs backend device name */
  #define DA_EMULATE_MODEL_ALIAS			0
  /* Emulation for WriteCache and SYNCHRONIZE_CACHE */
  #define DA_EMULATE_WRITE_CACHE			0
  /* Emulation for TASK_ABORTED status (TAS) by default */
  #define DA_EMULATE_TAS				1
  /* Emulation for Thin Provisioning UNMAP using block/blk-lib.c:blkdev_issue_discard() */
  #define DA_EMULATE_TPU				0
  /*
   * Emulation for Thin Provisioning WRITE_SAME w/ UNMAP=1 bit using
   * block/blk-lib.c:blkdev_issue_discard()
   */
  #define DA_EMULATE_TPWS				0
  /* Emulation for CompareAndWrite (AtomicTestandSet) by default */
  #define DA_EMULATE_CAW				1
  /* Emulation for 3rd Party Copy (ExtendedCopy) by default */
  #define DA_EMULATE_3PC				1
  /* No Emulation for PSCSI by default */
  #define DA_EMULATE_ALUA				0
  /* Emulate SCSI2 RESERVE/RELEASE and Persistent Reservations by default */
  #define DA_EMULATE_PR				1
  /* Enforce SCSI Initiator Port TransportID with 'ISID' for PR */
  #define DA_ENFORCE_PR_ISIDS			1
  /* Force SPC-3 PR Activate Persistence across Target Power Loss */
  #define DA_FORCE_PR_APTPL			0
  #define DA_STATUS_MAX_SECTORS_MIN		16
  #define DA_STATUS_MAX_SECTORS_MAX		8192
  /* By default don't report non-rotating (solid state) medium */
  #define DA_IS_NONROT				0
  /* Queue Algorithm Modifier default for restricted reordering in control mode page */
  #define DA_EMULATE_REST_REORD			0
  
  #define SE_INQUIRY_BUF				1024
  #define SE_MODE_PAGE_BUF			512
  #define SE_SENSE_BUF				96
  
  /* struct se_hba->hba_flags */
  enum hba_flags_table {
  	HBA_FLAGS_INTERNAL_USE	= 0x01,
  	HBA_FLAGS_PSCSI_MODE	= 0x02,
  };
  
  /* Special transport agnostic struct se_cmd->t_states */
  enum transport_state_table {
  	TRANSPORT_NO_STATE	= 0,
  	TRANSPORT_NEW_CMD	= 1,
  	TRANSPORT_WRITE_PENDING	= 3,
  	TRANSPORT_PROCESSING	= 5,
  	TRANSPORT_COMPLETE	= 6,
  	TRANSPORT_ISTATE_PROCESSING = 11,
  	TRANSPORT_COMPLETE_QF_WP = 18,
  	TRANSPORT_COMPLETE_QF_OK = 19,
  	TRANSPORT_COMPLETE_QF_ERR = 20,
  };
  
  /* Used for struct se_cmd->se_cmd_flags */
  enum se_cmd_flags_table {
  	SCF_SUPPORTED_SAM_OPCODE		= (1 << 0),
  	SCF_TRANSPORT_TASK_SENSE		= (1 << 1),
  	SCF_EMULATED_TASK_SENSE			= (1 << 2),
  	SCF_SCSI_DATA_CDB			= (1 << 3),
  	SCF_SCSI_TMR_CDB			= (1 << 4),
  	SCF_FUA					= (1 << 5),
  	SCF_SE_LUN_CMD				= (1 << 6),
  	SCF_BIDI				= (1 << 7),
  	SCF_SENT_CHECK_CONDITION		= (1 << 8),
  	SCF_OVERFLOW_BIT			= (1 << 9),
  	SCF_UNDERFLOW_BIT			= (1 << 10),
  	SCF_ALUA_NON_OPTIMIZED			= (1 << 11),
  	SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC	= (1 << 12),
  	SCF_COMPARE_AND_WRITE			= (1 << 13),
  	SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC	= (1 << 14),
  	SCF_ACK_KREF				= (1 << 15),
  	SCF_USE_CPUID				= (1 << 16),
  	SCF_TASK_ATTR_SET			= (1 << 17),
  	SCF_TREAT_READ_AS_NORMAL		= (1 << 18),
  };
  
  /*
   * Used by transport_send_check_condition_and_sense()
   * to signal which ASC/ASCQ sense payload should be built.
   */
  typedef unsigned __bitwise sense_reason_t;
  
  enum tcm_sense_reason_table {
  #define R(x)	(__force sense_reason_t )(x)
  	TCM_NO_SENSE				= R(0x00),
  	TCM_NON_EXISTENT_LUN			= R(0x01),
  	TCM_UNSUPPORTED_SCSI_OPCODE		= R(0x02),
  	TCM_INCORRECT_AMOUNT_OF_DATA		= R(0x03),
  	TCM_UNEXPECTED_UNSOLICITED_DATA		= R(0x04),
  	TCM_SERVICE_CRC_ERROR			= R(0x05),
  	TCM_SNACK_REJECTED			= R(0x06),
  	TCM_SECTOR_COUNT_TOO_MANY		= R(0x07),
  	TCM_INVALID_CDB_FIELD			= R(0x08),
  	TCM_INVALID_PARAMETER_LIST		= R(0x09),
  	TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE	= R(0x0a),
  	TCM_UNKNOWN_MODE_PAGE			= R(0x0b),
  	TCM_WRITE_PROTECTED			= R(0x0c),
  	TCM_CHECK_CONDITION_ABORT_CMD		= R(0x0d),
  	TCM_CHECK_CONDITION_UNIT_ATTENTION	= R(0x0e),
  	TCM_CHECK_CONDITION_NOT_READY		= R(0x0f),
  	TCM_RESERVATION_CONFLICT		= R(0x10),
  	TCM_ADDRESS_OUT_OF_RANGE		= R(0x11),
  	TCM_OUT_OF_RESOURCES			= R(0x12),
  	TCM_PARAMETER_LIST_LENGTH_ERROR		= R(0x13),
  	TCM_MISCOMPARE_VERIFY			= R(0x14),
  	TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED	= R(0x15),
  	TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED	= R(0x16),
  	TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED	= R(0x17),
  	TCM_COPY_TARGET_DEVICE_NOT_REACHABLE	= R(0x18),
  	TCM_TOO_MANY_TARGET_DESCS		= R(0x19),
  	TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE	= R(0x1a),
  	TCM_TOO_MANY_SEGMENT_DESCS		= R(0x1b),
  	TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE	= R(0x1c),
  	TCM_INSUFFICIENT_REGISTRATION_RESOURCES	= R(0x1d),
  	TCM_LUN_BUSY				= R(0x1e),
  	TCM_INVALID_FIELD_IN_COMMAND_IU         = R(0x1f),
  #undef R
  };
  
  enum target_sc_flags_table {
  	TARGET_SCF_BIDI_OP		= 0x01,
  	TARGET_SCF_ACK_KREF		= 0x02,
  	TARGET_SCF_UNKNOWN_SIZE		= 0x04,
  	TARGET_SCF_USE_CPUID		= 0x08,
  };
  
  /* fabric independent task management function values */
  enum tcm_tmreq_table {
  	TMR_ABORT_TASK		= 1,
  	TMR_ABORT_TASK_SET	= 2,
  	TMR_CLEAR_ACA		= 3,
  	TMR_CLEAR_TASK_SET	= 4,
  	TMR_LUN_RESET		= 5,
  	TMR_TARGET_WARM_RESET	= 6,
  	TMR_TARGET_COLD_RESET	= 7,
  	TMR_LUN_RESET_PRO	= 0x80,
  	TMR_UNKNOWN		= 0xff,
  };
  
  /* fabric independent task management response values */
  enum tcm_tmrsp_table {
  	TMR_FUNCTION_FAILED		= 0,
  	TMR_FUNCTION_COMPLETE		= 1,
  	TMR_TASK_DOES_NOT_EXIST		= 2,
  	TMR_LUN_DOES_NOT_EXIST		= 3,
  	TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED	= 4,
  	TMR_FUNCTION_REJECTED		= 5,
  };
  
  /*
   * Used for target SCSI statistics
   */
  typedef enum {
  	SCSI_INST_INDEX,
  	SCSI_AUTH_INTR_INDEX,
  	SCSI_INDEX_TYPE_MAX
  } scsi_index_t;
  
  struct se_cmd;
  
  struct t10_alua_lba_map_member {
  	struct list_head lba_map_mem_list;
  	int lba_map_mem_alua_state;
  	int lba_map_mem_alua_pg_id;
  };
  
  struct t10_alua_lba_map {
  	u64 lba_map_first_lba;
  	u64 lba_map_last_lba;
  	struct list_head lba_map_list;
  	struct list_head lba_map_mem_list;
  };
  
  struct t10_alua {
  	/* ALUA Target Port Group ID */
  	u16	alua_tg_pt_gps_counter;
  	u32	alua_tg_pt_gps_count;
  	/* Referrals support */
  	spinlock_t lba_map_lock;
  	u32     lba_map_segment_size;
  	u32     lba_map_segment_multiplier;
  	struct list_head lba_map_list;
  	spinlock_t tg_pt_gps_lock;
  	struct se_device *t10_dev;
  	/* Used for default ALUA Target Port Group */
  	struct t10_alua_tg_pt_gp *default_tg_pt_gp;
  	/* Used for default ALUA Target Port Group ConfigFS group */
  	struct config_group alua_tg_pt_gps_group;
  	struct list_head tg_pt_gps_list;
  };
  
  struct t10_alua_lu_gp {
  	u16	lu_gp_id;
  	int	lu_gp_valid_id;
  	u32	lu_gp_members;
  	atomic_t lu_gp_ref_cnt;
  	spinlock_t lu_gp_lock;
  	struct config_group lu_gp_group;
  	struct list_head lu_gp_node;
  	struct list_head lu_gp_mem_list;
  };
  
  struct t10_alua_lu_gp_member {
  	bool lu_gp_assoc;
  	atomic_t lu_gp_mem_ref_cnt;
  	spinlock_t lu_gp_mem_lock;
  	struct t10_alua_lu_gp *lu_gp;
  	struct se_device *lu_gp_mem_dev;
  	struct list_head lu_gp_mem_list;
  };
  
  struct t10_alua_tg_pt_gp {
  	u16	tg_pt_gp_id;
  	int	tg_pt_gp_valid_id;
  	int	tg_pt_gp_alua_supported_states;
  	int	tg_pt_gp_alua_access_status;
  	int	tg_pt_gp_alua_access_type;
  	int	tg_pt_gp_nonop_delay_msecs;
  	int	tg_pt_gp_trans_delay_msecs;
  	int	tg_pt_gp_implicit_trans_secs;
  	int	tg_pt_gp_pref;
  	int	tg_pt_gp_write_metadata;
  	u32	tg_pt_gp_members;
  	int	tg_pt_gp_alua_access_state;
  	atomic_t tg_pt_gp_ref_cnt;
  	spinlock_t tg_pt_gp_lock;
  	struct mutex tg_pt_gp_transition_mutex;
  	struct se_device *tg_pt_gp_dev;
  	struct config_group tg_pt_gp_group;
  	struct list_head tg_pt_gp_list;
  	struct list_head tg_pt_gp_lun_list;
  	struct se_lun *tg_pt_gp_alua_lun;
  	struct se_node_acl *tg_pt_gp_alua_nacl;
  };
  
  struct t10_vpd {
  	unsigned char device_identifier[INQUIRY_VPD_DEVICE_IDENTIFIER_LEN];
  	int protocol_identifier_set;
  	u32 protocol_identifier;
  	u32 device_identifier_code_set;
  	u32 association;
  	u32 device_identifier_type;
  	struct list_head vpd_list;
  };
  
  struct t10_wwn {
  	/*
  	 * SCSI left aligned strings may not be null terminated. +1 to ensure a
  	 * null terminator is always present.
  	 */
  	char vendor[INQUIRY_VENDOR_LEN + 1];
  	char model[INQUIRY_MODEL_LEN + 1];
  	char revision[INQUIRY_REVISION_LEN + 1];
  	char unit_serial[INQUIRY_VPD_SERIAL_LEN];
  	spinlock_t t10_vpd_lock;
  	struct se_device *t10_dev;
  	struct config_group t10_wwn_group;
  	struct list_head t10_vpd_list;
  };
  
  struct t10_pr_registration {
  	/* Used for fabrics that contain WWN+ISID */
  #define PR_REG_ISID_LEN				16
  	/* PR_REG_ISID_LEN + ',i,0x' */
  #define PR_REG_ISID_ID_LEN			(PR_REG_ISID_LEN + 5)
  	char pr_reg_isid[PR_REG_ISID_LEN];
  	/* Used during APTPL metadata reading */
  #define PR_APTPL_MAX_IPORT_LEN			256
  	unsigned char pr_iport[PR_APTPL_MAX_IPORT_LEN];
  	/* Used during APTPL metadata reading */
  #define PR_APTPL_MAX_TPORT_LEN			256
  	unsigned char pr_tport[PR_APTPL_MAX_TPORT_LEN];
  	u16 pr_aptpl_rpti;
  	u16 pr_reg_tpgt;
  	/* Reservation effects all target ports */
  	int pr_reg_all_tg_pt;
  	/* Activate Persistence across Target Power Loss */
  	int pr_reg_aptpl;
  	int pr_res_holder;
  	int pr_res_type;
  	int pr_res_scope;
  	/* Used for fabric initiator WWPNs using a ISID */
  	bool isid_present_at_reg;
  	u64 pr_res_mapped_lun;
  	u64 pr_aptpl_target_lun;
  	u16 tg_pt_sep_rtpi;
  	u32 pr_res_generation;
  	u64 pr_reg_bin_isid;
  	u64 pr_res_key;
  	atomic_t pr_res_holders;
  	struct se_node_acl *pr_reg_nacl;
  	/* Used by ALL_TG_PT=1 registration with deve->pr_ref taken */
  	struct se_dev_entry *pr_reg_deve;
  	struct list_head pr_reg_list;
  	struct list_head pr_reg_abort_list;
  	struct list_head pr_reg_aptpl_list;
  	struct list_head pr_reg_atp_list;
  	struct list_head pr_reg_atp_mem_list;
  };
  
  struct t10_reservation {
  	/* Reservation effects all target ports */
  	int pr_all_tg_pt;
  	/* Activate Persistence across Target Power Loss enabled
  	 * for SCSI device */
  	int pr_aptpl_active;
  #define PR_APTPL_BUF_LEN			262144
  	u32 pr_generation;
  	spinlock_t registration_lock;
  	spinlock_t aptpl_reg_lock;
  	/*
  	 * This will always be set by one individual I_T Nexus.
  	 * However with all_tg_pt=1, other I_T Nexus from the
  	 * same initiator can access PR reg/res info on a different
  	 * target port.
  	 *
  	 * There is also the 'All Registrants' case, where there is
  	 * a single *pr_res_holder of the reservation, but all
  	 * registrations are considered reservation holders.
  	 */
  	struct se_node_acl *pr_res_holder;
  	struct list_head registration_list;
  	struct list_head aptpl_reg_list;
  };
  
  struct se_tmr_req {
  	/* Task Management function to be performed */
  	u8			function;
  	/* Task Management response to send */
  	u8			response;
  	int			call_transport;
  	/* Reference to ITT that Task Mgmt should be performed */
  	u64			ref_task_tag;
  	void 			*fabric_tmr_ptr;
  	struct se_cmd		*task_cmd;
  	struct se_device	*tmr_dev;
  	struct list_head	tmr_list;
  };
  
  enum target_prot_op {
  	TARGET_PROT_NORMAL	= 0,
  	TARGET_PROT_DIN_INSERT	= (1 << 0),
  	TARGET_PROT_DOUT_INSERT	= (1 << 1),
  	TARGET_PROT_DIN_STRIP	= (1 << 2),
  	TARGET_PROT_DOUT_STRIP	= (1 << 3),
  	TARGET_PROT_DIN_PASS	= (1 << 4),
  	TARGET_PROT_DOUT_PASS	= (1 << 5),
  };
  
  #define TARGET_PROT_ALL	TARGET_PROT_DIN_INSERT | TARGET_PROT_DOUT_INSERT | \
  			TARGET_PROT_DIN_STRIP | TARGET_PROT_DOUT_STRIP | \
  			TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS
  
  enum target_prot_type {
  	TARGET_DIF_TYPE0_PROT,
  	TARGET_DIF_TYPE1_PROT,
  	TARGET_DIF_TYPE2_PROT,
  	TARGET_DIF_TYPE3_PROT,
  };
  
  /* Emulation for UNIT ATTENTION Interlock Control */
  enum target_ua_intlck_ctrl {
  	TARGET_UA_INTLCK_CTRL_CLEAR = 0,
  	TARGET_UA_INTLCK_CTRL_NO_CLEAR = 1,
  	TARGET_UA_INTLCK_CTRL_ESTABLISH_UA = 2,
  };
  
  enum target_core_dif_check {
  	TARGET_DIF_CHECK_GUARD  = 0x1 << 0,
  	TARGET_DIF_CHECK_APPTAG = 0x1 << 1,
  	TARGET_DIF_CHECK_REFTAG = 0x1 << 2,
  };
  
  /* for sam_task_attr */
  #define TCM_SIMPLE_TAG	0x20
  #define TCM_HEAD_TAG	0x21
  #define TCM_ORDERED_TAG	0x22
  #define TCM_ACA_TAG	0x24
  
  struct se_cmd {
  	/* SAM response code being sent to initiator */
  	u8			scsi_status;
  	u8			scsi_asc;
  	u8			scsi_ascq;
  	u16			scsi_sense_length;
  	unsigned		unknown_data_length:1;
  	bool			state_active:1;
  	u64			tag; /* SAM command identifier aka task tag */
  	/* Delay for ALUA Active/NonOptimized state access in milliseconds */
  	int			alua_nonop_delay;
  	/* See include/linux/dma-mapping.h */
  	enum dma_data_direction	data_direction;
  	/* For SAM Task Attribute */
  	int			sam_task_attr;
  	/* Used for se_sess->sess_tag_pool */
  	unsigned int		map_tag;
  	int			map_cpu;
  	/* Transport protocol dependent state, see transport_state_table */
  	enum transport_state_table t_state;
  	/* See se_cmd_flags_table */
  	u32			se_cmd_flags;
  	/* Total size in bytes associated with command */
  	u32			data_length;
  	u32			residual_count;
  	u64			orig_fe_lun;
  	/* Persistent Reservation key */
  	u64			pr_res_key;
  	/* Used for sense data */
  	void			*sense_buffer;
  	struct list_head	se_delayed_node;
  	struct list_head	se_qf_node;
  	struct se_device      *se_dev;
  	struct se_lun		*se_lun;
  	/* Only used for internal passthrough and legacy TCM fabric modules */
  	struct se_session	*se_sess;
  	struct se_tmr_req	*se_tmr_req;
  	struct llist_node	se_cmd_list;
  	struct completion	*free_compl;
  	struct completion	*abrt_compl;
  	const struct target_core_fabric_ops *se_tfo;
  	sense_reason_t		(*execute_cmd)(struct se_cmd *);
  	sense_reason_t (*transport_complete_callback)(struct se_cmd *, bool, int *);
  	void			*protocol_data;
  
  	unsigned char		*t_task_cdb;
  	unsigned char		__t_task_cdb[TCM_MAX_COMMAND_SIZE];
  	unsigned long long	t_task_lba;
  	unsigned int		t_task_nolb;
  	unsigned int		transport_state;
  #define CMD_T_ABORTED		(1 << 0)
  #define CMD_T_ACTIVE		(1 << 1)
  #define CMD_T_COMPLETE		(1 << 2)
  #define CMD_T_SENT		(1 << 4)
  #define CMD_T_STOP		(1 << 5)
  #define CMD_T_TAS		(1 << 10)
  #define CMD_T_FABRIC_STOP	(1 << 11)
  	spinlock_t		t_state_lock;
  	struct kref		cmd_kref;
  	struct completion	t_transport_stop_comp;
  
  	struct work_struct	work;
  
  	struct scatterlist	*t_data_sg;
  	struct scatterlist	*t_data_sg_orig;
  	unsigned int		t_data_nents;
  	unsigned int		t_data_nents_orig;
  	void			*t_data_vmap;
  	struct scatterlist	*t_bidi_data_sg;
  	unsigned int		t_bidi_data_nents;
  
  	/* Used for lun->lun_ref counting */
  	int			lun_ref_active;
  
  	struct list_head	state_list;
  
  	/* backend private data */
  	void			*priv;
  
  	/* DIF related members */
  	enum target_prot_op	prot_op;
  	enum target_prot_type	prot_type;
  	u8			prot_checks;
  	bool			prot_pto;
  	u32			prot_length;
  	u32			reftag_seed;
  	struct scatterlist	*t_prot_sg;
  	unsigned int		t_prot_nents;
  	sense_reason_t		pi_err;
  	u64			sense_info;
  	/*
  	 * CPU LIO will execute the cmd on. Defaults to the CPU the cmd is
  	 * initialized on. Drivers can override.
  	 */
  	int			cpuid;
  };
  
  struct se_ua {
  	u8			ua_asc;
  	u8			ua_ascq;
  	struct list_head	ua_nacl_list;
  };
  
  struct se_node_acl {
  	char			initiatorname[TRANSPORT_IQN_LEN];
  	/* Used to signal demo mode created ACL, disabled by default */
  	bool			dynamic_node_acl;
  	bool			dynamic_stop;
  	u32			queue_depth;
  	u32			acl_index;
  	enum target_prot_type	saved_prot_type;
  #define MAX_ACL_TAG_SIZE 64
  	char			acl_tag[MAX_ACL_TAG_SIZE];
  	/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
  	atomic_t		acl_pr_ref_count;
  	struct hlist_head	lun_entry_hlist;
  	struct se_session	*nacl_sess;
  	struct se_portal_group *se_tpg;
  	struct mutex		lun_entry_mutex;
  	spinlock_t		nacl_sess_lock;
  	struct config_group	acl_group;
  	struct config_group	acl_attrib_group;
  	struct config_group	acl_auth_group;
  	struct config_group	acl_param_group;
  	struct config_group	acl_fabric_stat_group;
  	struct list_head	acl_list;
  	struct list_head	acl_sess_list;
  	struct completion	acl_free_comp;
  	struct kref		acl_kref;
  };
  
  static inline struct se_node_acl *acl_to_nacl(struct config_item *item)
  {
  	return container_of(to_config_group(item), struct se_node_acl,
  			acl_group);
  }
  
  static inline struct se_node_acl *attrib_to_nacl(struct config_item *item)
  {
  	return container_of(to_config_group(item), struct se_node_acl,
  			acl_attrib_group);
  }
  
  static inline struct se_node_acl *auth_to_nacl(struct config_item *item)
  {
  	return container_of(to_config_group(item), struct se_node_acl,
  			acl_auth_group);
  }
  
  static inline struct se_node_acl *param_to_nacl(struct config_item *item)
  {
  	return container_of(to_config_group(item), struct se_node_acl,
  			acl_param_group);
  }
  
  static inline struct se_node_acl *fabric_stat_to_nacl(struct config_item *item)
  {
  	return container_of(to_config_group(item), struct se_node_acl,
  			acl_fabric_stat_group);
  }
  
  struct se_session {
  	atomic_t		stopped;
  	u64			sess_bin_isid;
  	enum target_prot_op	sup_prot_ops;
  	enum target_prot_type	sess_prot_type;
  	struct se_node_acl	*se_node_acl;
  	struct se_portal_group *se_tpg;
  	void			*fabric_sess_ptr;
  	struct percpu_ref	cmd_count;
  	struct list_head	sess_list;
  	struct list_head	sess_acl_list;
  	spinlock_t		sess_cmd_lock;
  	wait_queue_head_t	cmd_count_wq;
  	struct completion	stop_done;
  	void			*sess_cmd_map;
  	struct sbitmap_queue	sess_tag_pool;
  };
  
  struct se_device;
  struct se_transform_info;
  struct scatterlist;
  
  struct se_ml_stat_grps {
  	struct config_group	stat_group;
  	struct config_group	scsi_auth_intr_group;
  	struct config_group	scsi_att_intr_port_group;
  };
  
  struct se_lun_acl {
  	u64			mapped_lun;
  	struct se_node_acl	*se_lun_nacl;
  	struct se_lun		*se_lun;
  	struct config_group	se_lun_group;
  	struct se_ml_stat_grps	ml_stat_grps;
  };
  
  struct se_dev_entry {
  	u64			mapped_lun;
  	u64			pr_res_key;
  	u64			creation_time;
  	bool			lun_access_ro;
  	u32			attach_count;
  	atomic_long_t		total_cmds;
  	atomic_long_t		read_bytes;
  	atomic_long_t		write_bytes;
  	/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
  	struct kref		pr_kref;
  	struct completion	pr_comp;
  	struct se_lun_acl __rcu	*se_lun_acl;
  	spinlock_t		ua_lock;
  	struct se_lun __rcu	*se_lun;
  #define DEF_PR_REG_ACTIVE		1
  	unsigned long		deve_flags;
  	struct list_head	alua_port_list;
  	struct list_head	lun_link;
  	struct list_head	ua_list;
  	struct hlist_node	link;
  	struct rcu_head		rcu_head;
  };
  
  struct se_dev_attrib {
  	bool		emulate_model_alias;
  	bool		emulate_dpo;		/* deprecated */
  	bool		emulate_fua_write;
  	bool		emulate_fua_read;	/* deprecated */
  	bool		emulate_write_cache;
  	enum target_ua_intlck_ctrl emulate_ua_intlck_ctrl;
  	bool		emulate_tas;
  	bool		emulate_tpu;
  	bool		emulate_tpws;
  	bool		emulate_caw;
  	bool		emulate_3pc;
  	bool		emulate_pr;
  	enum target_prot_type pi_prot_type;
  	enum target_prot_type hw_pi_prot_type;
  	bool		pi_prot_verify;
  	bool		enforce_pr_isids;
  	bool		force_pr_aptpl;
  	bool		is_nonrot;
  	bool		emulate_rest_reord;
  	bool		unmap_zeroes_data;
  	u32		hw_block_size;
  	u32		block_size;
  	u32		hw_max_sectors;
  	u32		optimal_sectors;
  	u32		hw_queue_depth;
  	u32		queue_depth;
  	u32		max_unmap_lba_count;
  	u32		max_unmap_block_desc_count;
  	u32		unmap_granularity;
  	u32		unmap_granularity_alignment;
  	u32		max_write_same_len;
  	u32		max_bytes_per_io;
  	struct se_device *da_dev;
  	struct config_group da_group;
  };
  
  struct se_port_stat_grps {
  	struct config_group stat_group;
  	struct config_group scsi_port_group;
  	struct config_group scsi_tgt_port_group;
  	struct config_group scsi_transport_group;
  };
  
  struct scsi_port_stats {
  	atomic_long_t	cmd_pdus;
  	atomic_long_t	tx_data_octets;
  	atomic_long_t	rx_data_octets;
  };
  
  struct se_lun {
  	u64			unpacked_lun;
  	bool			lun_shutdown;
  	bool			lun_access_ro;
  	u32			lun_index;
  
  	/* RELATIVE TARGET PORT IDENTIFER */
  	u16			lun_rtpi;
  	atomic_t		lun_acl_count;
  	struct se_device __rcu	*lun_se_dev;
  
  	struct list_head	lun_deve_list;
  	spinlock_t		lun_deve_lock;
  
  	/* ALUA state */
  	int			lun_tg_pt_secondary_stat;
  	int			lun_tg_pt_secondary_write_md;
  	atomic_t		lun_tg_pt_secondary_offline;
  	struct mutex		lun_tg_pt_md_mutex;
  
  	/* ALUA target port group linkage */
  	struct list_head	lun_tg_pt_gp_link;
  	struct t10_alua_tg_pt_gp *lun_tg_pt_gp;
  	spinlock_t		lun_tg_pt_gp_lock;
  
  	struct se_portal_group	*lun_tpg;
  	struct scsi_port_stats	lun_stats;
  	struct config_group	lun_group;
  	struct se_port_stat_grps port_stat_grps;
  	struct completion	lun_shutdown_comp;
  	struct percpu_ref	lun_ref;
  	struct list_head	lun_dev_link;
  	struct hlist_node	link;
  	struct rcu_head		rcu_head;
  };
  
  struct se_dev_stat_grps {
  	struct config_group stat_group;
  	struct config_group scsi_dev_group;
  	struct config_group scsi_tgt_dev_group;
  	struct config_group scsi_lu_group;
  };
  
  struct se_cmd_queue {
  	struct llist_head	cmd_list;
  	struct work_struct	work;
  };
  
  struct se_dev_plug {
  	struct se_device	*se_dev;
  };
  
  struct se_device_queue {
  	struct list_head	state_list;
  	spinlock_t		lock;
  	struct se_cmd_queue	sq;
  };
  
  struct se_device {
  	/* RELATIVE TARGET PORT IDENTIFER Counter */
  	u16			dev_rpti_counter;
  	/* Used for SAM Task Attribute ordering */
  	u32			dev_cur_ordered_id;
  	u32			dev_flags;
  #define DF_CONFIGURED				0x00000001
  #define DF_FIRMWARE_VPD_UNIT_SERIAL		0x00000002
  #define DF_EMULATED_VPD_UNIT_SERIAL		0x00000004
  #define DF_USING_UDEV_PATH			0x00000008
  #define DF_USING_ALIAS				0x00000010
  #define DF_READ_ONLY				0x00000020
  	u8			transport_flags;
  	/* Physical device queue depth */
  	u32			queue_depth;
  	/* Used for SPC-2 reservations enforce of ISIDs */
  	u64			dev_res_bin_isid;
  	/* Pointer to transport specific device structure */
  	u32			dev_index;
  	u64			creation_time;
  	atomic_long_t		num_resets;
  	atomic_long_t		aborts_complete;
  	atomic_long_t		aborts_no_task;
  	atomic_long_t		num_cmds;
  	atomic_long_t		read_bytes;
  	atomic_long_t		write_bytes;
  	/* Active commands on this virtual SE device */
  	atomic_t		simple_cmds;
  	atomic_t		dev_ordered_sync;
  	atomic_t		dev_qf_count;
  	u32			export_count;
  	spinlock_t		delayed_cmd_lock;
  	spinlock_t		dev_reservation_lock;
  	unsigned int		dev_reservation_flags;
  #define DRF_SPC2_RESERVATIONS			0x00000001
  #define DRF_SPC2_RESERVATIONS_WITH_ISID		0x00000002
  	spinlock_t		se_port_lock;
  	spinlock_t		se_tmr_lock;
  	spinlock_t		qf_cmd_lock;
  	struct semaphore	caw_sem;
  	/* Used for legacy SPC-2 reservations */
  	struct se_session	*reservation_holder;
  	/* Used for ALUA Logical Unit Group membership */
  	struct t10_alua_lu_gp_member *dev_alua_lu_gp_mem;
  	/* Used for SPC-3 Persistent Reservations */
  	struct t10_pr_registration *dev_pr_res_holder;
  	struct list_head	dev_sep_list;
  	struct list_head	dev_tmr_list;
  	struct work_struct	qf_work_queue;
  	struct list_head	delayed_cmd_list;
  	struct list_head	qf_cmd_list;
  	/* Pointer to associated SE HBA */
  	struct se_hba		*se_hba;
  	/* T10 Inquiry and VPD WWN Information */
  	struct t10_wwn		t10_wwn;
  	/* T10 Asymmetric Logical Unit Assignment for Target Ports */
  	struct t10_alua		t10_alua;
  	/* T10 SPC-2 + SPC-3 Reservations */
  	struct t10_reservation	t10_pr;
  	struct se_dev_attrib	dev_attrib;
  	struct config_group	dev_action_group;
  	struct config_group	dev_group;
  	struct config_group	dev_pr_group;
  	struct se_dev_stat_grps dev_stat_grps;
  #define SE_DEV_ALIAS_LEN 512		/* must be less than PAGE_SIZE */
  	unsigned char		dev_alias[SE_DEV_ALIAS_LEN];
  #define SE_UDEV_PATH_LEN 512		/* must be less than PAGE_SIZE */
  	unsigned char		udev_path[SE_UDEV_PATH_LEN];
  	/* Pointer to template of function pointers for transport */
  	const struct target_backend_ops *transport;
  	struct se_lun		xcopy_lun;
  	/* Protection Information */
  	int			prot_length;
  	/* For se_lun->lun_se_dev RCU read-side critical access */
  	u32			hba_index;
  	struct rcu_head		rcu_head;
  	int			queue_cnt;
  	struct se_device_queue	*queues;
  };
  
  struct se_hba {
  	u16			hba_tpgt;
  	u32			hba_id;
  	/* See hba_flags_table */
  	u32			hba_flags;
  	/* Virtual iSCSI devices attached. */
  	u32			dev_count;
  	u32			hba_index;
  	/* Pointer to transport specific host structure. */
  	void			*hba_ptr;
  	struct list_head	hba_node;
  	spinlock_t		device_lock;
  	struct config_group	hba_group;
  	struct mutex		hba_access_mutex;
  	struct target_backend	*backend;
  };
  
  struct se_tpg_np {
  	struct se_portal_group *tpg_np_parent;
  	struct config_group	tpg_np_group;
  };
  
  static inline struct se_tpg_np *to_tpg_np(struct config_item *item)
  {
  	return container_of(to_config_group(item), struct se_tpg_np,
  			tpg_np_group);
  }
  
  struct se_portal_group {
  	/*
  	 * PROTOCOL IDENTIFIER value per SPC4, 7.5.1.
  	 *
  	 * Negative values can be used by fabric drivers for internal use TPGs.
  	 */
  	int			proto_id;
  	/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
  	atomic_t		tpg_pr_ref_count;
  	/* Spinlock for adding/removing ACLed Nodes */
  	struct mutex		acl_node_mutex;
  	/* Spinlock for adding/removing sessions */
  	spinlock_t		session_lock;
  	struct mutex		tpg_lun_mutex;
  	/* linked list for initiator ACL list */
  	struct list_head	acl_node_list;
  	struct hlist_head	tpg_lun_hlist;
  	struct se_lun		*tpg_virt_lun0;
  	/* List of TCM sessions associated wth this TPG */
  	struct list_head	tpg_sess_list;
  	/* Pointer to $FABRIC_MOD dependent code */
  	const struct target_core_fabric_ops *se_tpg_tfo;
  	struct se_wwn		*se_tpg_wwn;
  	struct config_group	tpg_group;
  	struct config_group	tpg_lun_group;
  	struct config_group	tpg_np_group;
  	struct config_group	tpg_acl_group;
  	struct config_group	tpg_attrib_group;
  	struct config_group	tpg_auth_group;
  	struct config_group	tpg_param_group;
  };
  
  static inline struct se_portal_group *to_tpg(struct config_item *item)
  {
  	return container_of(to_config_group(item), struct se_portal_group,
  			tpg_group);
  }
  
  static inline struct se_portal_group *attrib_to_tpg(struct config_item *item)
  {
  	return container_of(to_config_group(item), struct se_portal_group,
  			tpg_attrib_group);
  }
  
  static inline struct se_portal_group *auth_to_tpg(struct config_item *item)
  {
  	return container_of(to_config_group(item), struct se_portal_group,
  			tpg_auth_group);
  }
  
  static inline struct se_portal_group *param_to_tpg(struct config_item *item)
  {
  	return container_of(to_config_group(item), struct se_portal_group,
  			tpg_param_group);
  }
  
  enum {
  	/* Use se_cmd's cpuid for completion */
  	SE_COMPL_AFFINITY_CPUID		= -1,
  	/* Complete on current CPU */
  	SE_COMPL_AFFINITY_CURR_CPU	= -2,
  };
  
  struct se_wwn {
  	struct target_fabric_configfs *wwn_tf;
  	void			*priv;
  	struct config_group	wwn_group;
  	struct config_group	fabric_stat_group;
  	struct config_group	param_group;
  	int			cmd_compl_affinity;
  };
  
  static inline void atomic_inc_mb(atomic_t *v)
  {
  	smp_mb__before_atomic();
  	atomic_inc(v);
  	smp_mb__after_atomic();
  }
  
  static inline void atomic_dec_mb(atomic_t *v)
  {
  	smp_mb__before_atomic();
  	atomic_dec(v);
  	smp_mb__after_atomic();
  }
  
  static inline void target_free_tag(struct se_session *sess, struct se_cmd *cmd)
  {
  	sbitmap_queue_clear(&sess->sess_tag_pool, cmd->map_tag, cmd->map_cpu);
  }
  
  #endif /* TARGET_CORE_BASE_H */
  