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kernel-fxtec-pro1x/drivers/target/target_core_alua.h
Christoph Hellwig adf653f92f target: Subsume se_port + t10_alua_tg_pt_gp_member into se_lun 
This patch eliminates all se_port + t10_alua_tg_pt_gp_member usage,
and converts current users to direct se_lun pointer dereference.

This includes the removal of core_export_port(), core_release_port()
core_dev_export() and core_dev_unexport().  Along with conversion
of special case se_lun pointer dereference within PR ALL_TG_PT=1
and ALUA access state transition UNIT_ATTENTION handling.

Also, update core_enable_device_list_for_node() to reference the
new per se_lun->lun_deve_list when creating a new entry, or
replacing an existing one via RCU.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-06-01 00:26:38 -07:00

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#ifndef TARGET_CORE_ALUA_H
#define TARGET_CORE_ALUA_H
/*
* INQUIRY response data, TPGS Field
*
* from spc4r17 section 6.4.2 Table 135
*/
#define TPGS_NO_ALUA 0x00
#define TPGS_IMPLICIT_ALUA 0x10
#define TPGS_EXPLICIT_ALUA 0x20
/*
* ASYMMETRIC ACCESS STATE field
*
* from spc4r36j section 6.37 Table 307
*/
#define ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED 0x0
#define ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED 0x1
#define ALUA_ACCESS_STATE_STANDBY 0x2
#define ALUA_ACCESS_STATE_UNAVAILABLE 0x3
#define ALUA_ACCESS_STATE_LBA_DEPENDENT 0x4
#define ALUA_ACCESS_STATE_OFFLINE 0xe
#define ALUA_ACCESS_STATE_TRANSITION 0xf
/*
* from spc4r36j section 6.37 Table 306
*/
#define ALUA_T_SUP 0x80
#define ALUA_O_SUP 0x40
#define ALUA_LBD_SUP 0x10
#define ALUA_U_SUP 0x08
#define ALUA_S_SUP 0x04
#define ALUA_AN_SUP 0x02
#define ALUA_AO_SUP 0x01
/*
* REPORT_TARGET_PORT_GROUP STATUS CODE
*
* from spc4r17 section 6.27 Table 246
*/
#define ALUA_STATUS_NONE 0x00
#define ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG 0x01
#define ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA 0x02
/*
* From spc4r17, Table D.1: ASC and ASCQ Assignement
*/
#define ASCQ_04H_ALUA_STATE_TRANSITION 0x0a
#define ASCQ_04H_ALUA_TG_PT_STANDBY 0x0b
#define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE 0x0c
#define ASCQ_04H_ALUA_OFFLINE 0x12
/*
* Used as the default for Active/NonOptimized delay (in milliseconds)
* This can also be changed via configfs on a per target port group basis..
*/
#define ALUA_DEFAULT_NONOP_DELAY_MSECS 100
#define ALUA_MAX_NONOP_DELAY_MSECS 10000 /* 10 seconds */
/*
* Used for implicit and explicit ALUA transitional delay, that is disabled
* by default, and is intended to be used for debugging client side ALUA code.
*/
#define ALUA_DEFAULT_TRANS_DELAY_MSECS 0
#define ALUA_MAX_TRANS_DELAY_MSECS 30000 /* 30 seconds */
/*
* Used for the recommended application client implicit transition timeout
* in seconds, returned by the REPORT_TARGET_PORT_GROUPS w/ extended header.
*/
#define ALUA_DEFAULT_IMPLICIT_TRANS_SECS 0
#define ALUA_MAX_IMPLICIT_TRANS_SECS 255
/*
* Used by core_alua_update_tpg_primary_metadata() and
* core_alua_update_tpg_secondary_metadata()
*/
#define ALUA_METADATA_PATH_LEN 512
/*
* Used by core_alua_update_tpg_secondary_metadata()
*/
#define ALUA_SECONDARY_METADATA_WWN_LEN 256
/* Used by core_alua_update_tpg_(primary,secondary)_metadata */
#define ALUA_MD_BUF_LEN 1024
extern struct kmem_cache *t10_alua_lu_gp_cache;
extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
extern struct kmem_cache *t10_alua_lba_map_cache;
extern struct kmem_cache *t10_alua_lba_map_mem_cache;
extern sense_reason_t target_emulate_report_target_port_groups(struct se_cmd *);
extern sense_reason_t target_emulate_set_target_port_groups(struct se_cmd *);
extern sense_reason_t target_emulate_report_referrals(struct se_cmd *);
extern int core_alua_check_nonop_delay(struct se_cmd *);
extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *,
struct se_device *, struct se_lun *,
struct se_node_acl *, int, int);
extern char *core_alua_dump_status(int);
extern struct t10_alua_lba_map *core_alua_allocate_lba_map(
struct list_head *, u64, u64);
extern int core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *, int, int);
extern void core_alua_free_lba_map(struct list_head *);
extern void core_alua_set_lba_map(struct se_device *, struct list_head *,
int, int);
extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
extern void core_alua_free_lu_gp_mem(struct se_device *);
extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
struct t10_alua_lu_gp *);
extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
struct t10_alua_lu_gp *);
extern void core_alua_drop_lu_gp_dev(struct se_device *);
extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
struct se_device *, const char *, int);
extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
extern void target_detach_tg_pt_gp(struct se_lun *);
extern void target_attach_tg_pt_gp(struct se_lun *, struct t10_alua_tg_pt_gp *);
extern ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *, char *);
extern ssize_t core_alua_store_tg_pt_gp_info(struct se_lun *, const char *,
size_t);
extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
const char *, size_t);
extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
char *);
extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
const char *, size_t);
extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
char *);
extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
const char *, size_t);
extern ssize_t core_alua_show_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
char *);
extern ssize_t core_alua_store_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
const char *, size_t);
extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
char *);
extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
const char *, size_t);
extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
size_t);
extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
extern ssize_t core_alua_store_secondary_status(struct se_lun *,
const char *, size_t);
extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
char *);
extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
const char *, size_t);
extern int core_setup_alua(struct se_device *);
extern sense_reason_t target_alua_state_check(struct se_cmd *cmd);
#endif /* TARGET_CORE_ALUA_H */
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