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_IMPLICIT_ALUA                      0x10
  11 #define TPGS_EXPLICIT_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_OPTIMIZED      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  * from spc4r36j section 6.37 Table 306
  27  */
  28 #define ALUA_T_SUP              0x80
  29 #define ALUA_O_SUP              0x40
  30 #define ALUA_LBD_SUP            0x10
  31 #define ALUA_U_SUP              0x08
  32 #define ALUA_S_SUP              0x04
  33 #define ALUA_AN_SUP             0x02
  34 #define ALUA_AO_SUP             0x01
  35
  36 /*
  37  * REPORT_TARGET_PORT_GROUP STATUS CODE
  38  *
  39  * from spc4r17 section 6.27 Table 246
  40  */
  41 #define ALUA_STATUS_NONE                                0x00
  42 #define ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG            0x01
  43 #define ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA            0x02
  44
  45 /*
  46  * From spc4r17, Table D.1: ASC and ASCQ Assignement
  47  */
  48 #define ASCQ_04H_ALUA_STATE_TRANSITION                  0x0a
  49 #define ASCQ_04H_ALUA_TG_PT_STANDBY                     0x0b
  50 #define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE                 0x0c
  51 #define ASCQ_04H_ALUA_OFFLINE                           0x12
  52
  53 /*
  54  * Used as the default for Active/NonOptimized delay (in milliseconds)
  55  * This can also be changed via configfs on a per target port group basis..
  56  */
  57 #define ALUA_DEFAULT_NONOP_DELAY_MSECS                  100
  58 #define ALUA_MAX_NONOP_DELAY_MSECS                      10000 /* 10 seconds */
  59 /*
  60  * Used for implicit and explicit ALUA transitional delay, that is disabled
  61  * by default, and is intended to be used for debugging client side ALUA code.
  62  */
  63 #define ALUA_DEFAULT_TRANS_DELAY_MSECS                  0
  64 #define ALUA_MAX_TRANS_DELAY_MSECS                      30000 /* 30 seconds */
  65 /*
  66  * Used for the recommended application client implicit transition timeout
  67  * in seconds, returned by the REPORT_TARGET_PORT_GROUPS w/ extended header.
  68  */
  69 #define ALUA_DEFAULT_IMPLICIT_TRANS_SECS                        0
  70 #define ALUA_MAX_IMPLICIT_TRANS_SECS                    255
  71 /*
  72  * Used by core_alua_update_tpg_primary_metadata() and
  73  * core_alua_update_tpg_secondary_metadata()
  74  */
  75 #define ALUA_METADATA_PATH_LEN                          512
  76 /*
  77  * Used by core_alua_update_tpg_secondary_metadata()
  78  */
  79 #define ALUA_SECONDARY_METADATA_WWN_LEN                 256
  80
  81 extern struct kmem_cache *t10_alua_lu_gp_cache;
  82 extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
  83 extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
  84 extern struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  85
  86 extern sense_reason_t target_emulate_report_target_port_groups(struct se_cmd *);
  87 extern sense_reason_t target_emulate_set_target_port_groups(struct se_cmd *);
  88 extern int core_alua_check_nonop_delay(struct se_cmd *);
  89 extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *,
  90                                 struct se_device *, struct se_port *,
  91                                 struct se_node_acl *, int, int);
  92 extern char *core_alua_dump_status(int);
  93 extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
  94 extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
  95 extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
  96 extern void core_alua_free_lu_gp_mem(struct se_device *);
  97 extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
  98 extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
  99 extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
 100                                         struct t10_alua_lu_gp *);
 101 extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
 102                                         struct t10_alua_lu_gp *);
 103 extern void core_alua_drop_lu_gp_dev(struct se_device *);
 104 extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
 105                         struct se_device *, const char *, int);
 106 extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
 107 extern struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
 108                                         struct se_port *);
 109 extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
 110 extern void core_alua_free_tg_pt_gp_mem(struct se_port *);
 111 extern void __core_alua_attach_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member *,
 112                                         struct t10_alua_tg_pt_gp *);
 113 extern ssize_t core_alua_show_tg_pt_gp_info(struct se_port *, char *);
 114 extern ssize_t core_alua_store_tg_pt_gp_info(struct se_port *, const char *,
 115                                                 size_t);
 116 extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
 117 extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
 118                                         const char *, size_t);
 119 extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
 120                                                 char *);
 121 extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
 122                                         const char *, size_t);
 123 extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
 124                                         char *);
 125 extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
 126                                         const char *, size_t);
 127 extern ssize_t core_alua_show_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
 128                                         char *);
 129 extern ssize_t core_alua_store_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
 130                                         const char *, size_t);
 131 extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
 132                                         char *);
 133 extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
 134                                         const char *, size_t);
 135 extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
 136 extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
 137                                         size_t);
 138 extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
 139 extern ssize_t core_alua_store_secondary_status(struct se_lun *,
 140                                         const char *, size_t);
 141 extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
 142                                         char *);
 143 extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
 144                                         const char *, size_t);
 145 extern int core_setup_alua(struct se_device *);
 146 extern sense_reason_t target_alua_state_check(struct se_cmd *cmd);
 147
 148 #endif /* TARGET_CORE_ALUA_H */