Root/drivers/target/target_core_alua.h

1#ifndef TARGET_CORE_ALUA_H
2#define TARGET_CORE_ALUA_H
3
4/*
5 * INQUIRY response data, TPGS Field
6 *
7 * from spc4r17 section 6.4.2 Table 135
8 */
9#define TPGS_NO_ALUA 0x00
10#define TPGS_IMPLICT_ALUA 0x10
11#define TPGS_EXPLICT_ALUA 0x20
12
13/*
14 * ASYMMETRIC ACCESS STATE field
15 *
16 * from spc4r17 section 6.27 Table 245
17 */
18#define ALUA_ACCESS_STATE_ACTIVE_OPTMIZED 0x0
19#define ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED 0x1
20#define ALUA_ACCESS_STATE_STANDBY 0x2
21#define ALUA_ACCESS_STATE_UNAVAILABLE 0x3
22#define ALUA_ACCESS_STATE_OFFLINE 0xe
23#define ALUA_ACCESS_STATE_TRANSITION 0xf
24
25/*
26 * REPORT_TARGET_PORT_GROUP STATUS CODE
27 *
28 * from spc4r17 section 6.27 Table 246
29 */
30#define ALUA_STATUS_NONE 0x00
31#define ALUA_STATUS_ALTERED_BY_EXPLICT_STPG 0x01
32#define ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA 0x02
33
34/*
35 * From spc4r17, Table D.1: ASC and ASCQ Assignement
36 */
37#define ASCQ_04H_ALUA_STATE_TRANSITION 0x0a
38#define ASCQ_04H_ALUA_TG_PT_STANDBY 0x0b
39#define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE 0x0c
40#define ASCQ_04H_ALUA_OFFLINE 0x12
41
42/*
43 * Used as the default for Active/NonOptimized delay (in milliseconds)
44 * This can also be changed via configfs on a per target port group basis..
45 */
46#define ALUA_DEFAULT_NONOP_DELAY_MSECS 100
47#define ALUA_MAX_NONOP_DELAY_MSECS 10000 /* 10 seconds */
48/*
49 * Used for implict and explict ALUA transitional delay, that is disabled
50 * by default, and is intended to be used for debugging client side ALUA code.
51 */
52#define ALUA_DEFAULT_TRANS_DELAY_MSECS 0
53#define ALUA_MAX_TRANS_DELAY_MSECS 30000 /* 30 seconds */
54/*
55 * Used for the recommended application client implict transition timeout
56 * in seconds, returned by the REPORT_TARGET_PORT_GROUPS w/ extended header.
57 */
58#define ALUA_DEFAULT_IMPLICT_TRANS_SECS 0
59#define ALUA_MAX_IMPLICT_TRANS_SECS 255
60/*
61 * Used by core_alua_update_tpg_primary_metadata() and
62 * core_alua_update_tpg_secondary_metadata()
63 */
64#define ALUA_METADATA_PATH_LEN 512
65/*
66 * Used by core_alua_update_tpg_secondary_metadata()
67 */
68#define ALUA_SECONDARY_METADATA_WWN_LEN 256
69
70extern struct kmem_cache *t10_alua_lu_gp_cache;
71extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
72extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
73extern struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
74
75extern int target_emulate_report_target_port_groups(struct se_cmd *);
76extern int target_emulate_set_target_port_groups(struct se_cmd *);
77extern int core_alua_check_nonop_delay(struct se_cmd *);
78extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *,
79                struct se_device *, struct se_port *,
80                struct se_node_acl *, int, int);
81extern char *core_alua_dump_status(int);
82extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
83extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
84extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
85extern void core_alua_free_lu_gp_mem(struct se_device *);
86extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
87extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
88extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
89                    struct t10_alua_lu_gp *);
90extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
91                    struct t10_alua_lu_gp *);
92extern void core_alua_drop_lu_gp_dev(struct se_device *);
93extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
94            struct se_subsystem_dev *, const char *, int);
95extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
96extern struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
97                    struct se_port *);
98extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
99extern void core_alua_free_tg_pt_gp_mem(struct se_port *);
100extern void __core_alua_attach_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member *,
101                    struct t10_alua_tg_pt_gp *);
102extern ssize_t core_alua_show_tg_pt_gp_info(struct se_port *, char *);
103extern ssize_t core_alua_store_tg_pt_gp_info(struct se_port *, const char *,
104                        size_t);
105extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
106extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
107                    const char *, size_t);
108extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
109                        char *);
110extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
111                    const char *, size_t);
112extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
113                    char *);
114extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
115                    const char *, size_t);
116extern ssize_t core_alua_show_implict_trans_secs(struct t10_alua_tg_pt_gp *,
117                    char *);
118extern ssize_t core_alua_store_implict_trans_secs(struct t10_alua_tg_pt_gp *,
119                    const char *, size_t);
120extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
121                    char *);
122extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
123                    const char *, size_t);
124extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
125extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
126                    size_t);
127extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
128extern ssize_t core_alua_store_secondary_status(struct se_lun *,
129                    const char *, size_t);
130extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
131                    char *);
132extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
133                    const char *, size_t);
134extern int core_setup_alua(struct se_device *, int);
135
136#endif /* TARGET_CORE_ALUA_H */
137

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