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target_core_alua.h
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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 
70 extern struct kmem_cache *t10_alua_lu_gp_cache;
71 extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
72 extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
73 extern struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
74 
75 extern int target_emulate_report_target_port_groups(struct se_cmd *);
76 extern int target_emulate_set_target_port_groups(struct se_cmd *);
77 extern int core_alua_check_nonop_delay(struct se_cmd *);
78 extern 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);
81 extern char *core_alua_dump_status(int);
82 extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
83 extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
84 extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
85 extern void core_alua_free_lu_gp_mem(struct se_device *);
86 extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
87 extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
88 extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
89  struct t10_alua_lu_gp *);
90 extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
91  struct t10_alua_lu_gp *);
92 extern void core_alua_drop_lu_gp_dev(struct se_device *);
93 extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
94  struct se_subsystem_dev *, const char *, int);
95 extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
96 extern struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
97  struct se_port *);
98 extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
99 extern void core_alua_free_tg_pt_gp_mem(struct se_port *);
100 extern void __core_alua_attach_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member *,
101  struct t10_alua_tg_pt_gp *);
102 extern ssize_t core_alua_show_tg_pt_gp_info(struct se_port *, char *);
103 extern ssize_t core_alua_store_tg_pt_gp_info(struct se_port *, const char *,
104  size_t);
105 extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
106 extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
107  const char *, size_t);
108 extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
109  char *);
110 extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
111  const char *, size_t);
112 extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
113  char *);
114 extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
115  const char *, size_t);
116 extern ssize_t core_alua_show_implict_trans_secs(struct t10_alua_tg_pt_gp *,
117  char *);
118 extern ssize_t core_alua_store_implict_trans_secs(struct t10_alua_tg_pt_gp *,
119  const char *, size_t);
120 extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
121  char *);
122 extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
123  const char *, size_t);
124 extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
125 extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
126  size_t);
127 extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
128 extern ssize_t core_alua_store_secondary_status(struct se_lun *,
129  const char *, size_t);
130 extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
131  char *);
132 extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
133  const char *, size_t);
134 extern int core_setup_alua(struct se_device *, int);
135 
136 #endif /* TARGET_CORE_ALUA_H */
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