diff options
Diffstat (limited to 'drivers/target/target_core_alua.h')
| -rw-r--r-- | drivers/target/target_core_alua.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/target/target_core_alua.h b/drivers/target/target_core_alua.h new file mode 100644 index 000000000..fc9637cce --- /dev/null +++ b/drivers/target/target_core_alua.h @@ -0,0 +1,151 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef TARGET_CORE_ALUA_H +#define TARGET_CORE_ALUA_H + +#include <target/target_core_base.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,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 */ |