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 spc4r36j section 6.37 Table 307
  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_LBA_DEPENDENT         0x4
  23 #define ALUA_ACCESS_STATE_OFFLINE               0xe
  24 #define ALUA_ACCESS_STATE_TRANSITION            0xf
  25
  26 /*
  27  * from spc4r36j section 6.37 Table 306
  28  */
  29 #define ALUA_T_SUP              0x80
  30 #define ALUA_O_SUP              0x40
  31 #define ALUA_LBD_SUP            0x10
  32 #define ALUA_U_SUP              0x08
  33 #define ALUA_S_SUP              0x04
  34 #define ALUA_AN_SUP             0x02
  35 #define ALUA_AO_SUP             0x01
  36
  37 /*
  38  * REPORT_TARGET_PORT_GROUP STATUS CODE
  39  *
  40  * from spc4r17 section 6.27 Table 246
  41  */
  42 #define ALUA_STATUS_NONE                                0x00
  43 #define ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG            0x01
  44 #define ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA            0x02
  45
  46 /*
  47  * From spc4r17, Table D.1: ASC and ASCQ Assignement
  48  */
  49 #define ASCQ_04H_ALUA_STATE_TRANSITION                  0x0a
  50 #define ASCQ_04H_ALUA_TG_PT_STANDBY                     0x0b
  51 #define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE                 0x0c
  52 #define ASCQ_04H_ALUA_OFFLINE                           0x12
  53
  54 /*
  55  * Used as the default for Active/NonOptimized delay (in milliseconds)
  56  * This can also be changed via configfs on a per target port group basis..
  57  */
  58 #define ALUA_DEFAULT_NONOP_DELAY_MSECS                  100
  59 #define ALUA_MAX_NONOP_DELAY_MSECS                      10000 /* 10 seconds */
  60 /*
  61  * Used for implicit and explicit ALUA transitional delay, that is disabled
  62  * by default, and is intended to be used for debugging client side ALUA code.
  63  */
  64 #define ALUA_DEFAULT_TRANS_DELAY_MSECS                  0
  65 #define ALUA_MAX_TRANS_DELAY_MSECS                      30000 /* 30 seconds */
  66 /*
  67  * Used for the recommended application client implicit transition timeout
  68  * in seconds, returned by the REPORT_TARGET_PORT_GROUPS w/ extended header.
  69  */
  70 #define ALUA_DEFAULT_IMPLICIT_TRANS_SECS                        0
  71 #define ALUA_MAX_IMPLICIT_TRANS_SECS                    255
  72 /*
  73  * Used by core_alua_update_tpg_primary_metadata() and
  74  * core_alua_update_tpg_secondary_metadata()
  75  */
  76 #define ALUA_METADATA_PATH_LEN                          512
  77 /*
  78  * Used by core_alua_update_tpg_secondary_metadata()
  79  */
  80 #define ALUA_SECONDARY_METADATA_WWN_LEN                 256
  81
  82 /* Used by core_alua_update_tpg_(primary,secondary)_metadata */
  83 #define ALUA_MD_BUF_LEN                                 1024
  84
  85 extern struct kmem_cache *t10_alua_lu_gp_cache;
  86 extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
  87 extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
  88 extern struct kmem_cache *t10_alua_lba_map_cache;
  89 extern struct kmem_cache *t10_alua_lba_map_mem_cache;
  90
  91 extern sense_reason_t target_emulate_report_target_port_groups(struct se_cmd *);
  92 extern sense_reason_t target_emulate_set_target_port_groups(struct se_cmd *);
  93 extern sense_reason_t target_emulate_report_referrals(struct se_cmd *);
  94 extern int core_alua_check_nonop_delay(struct se_cmd *);
  95 extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *,
  96                                 struct se_device *, struct se_lun *,
  97                                 struct se_node_acl *, int, int);
  98 extern char *core_alua_dump_status(int);
  99 extern struct t10_alua_lba_map *core_alua_allocate_lba_map(
 100                                 struct list_head *, u64, u64);
 101 extern int core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *, int, int);
 102 extern void core_alua_free_lba_map(struct list_head *);
 103 extern void core_alua_set_lba_map(struct se_device *, struct list_head *,
 104                                 int, int);
 105 extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
 106 extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
 107 extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
 108 extern void core_alua_free_lu_gp_mem(struct se_device *);
 109 extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
 110 extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
 111 extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
 112                                         struct t10_alua_lu_gp *);
 113 extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
 114                                         struct t10_alua_lu_gp *);
 115 extern void core_alua_drop_lu_gp_dev(struct se_device *);
 116 extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
 117                         struct se_device *, const char *, int);
 118 extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
 119 extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
 120 extern void target_detach_tg_pt_gp(struct se_lun *);
 121 extern void target_attach_tg_pt_gp(struct se_lun *, struct t10_alua_tg_pt_gp *);
 122 extern ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *, char *);
 123 extern ssize_t core_alua_store_tg_pt_gp_info(struct se_lun *, const char *,
 124                                                 size_t);
 125 extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
 126 extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
 127                                         const char *, size_t);
 128 extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
 129                                                 char *);
 130 extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
 131                                         const char *, size_t);
 132 extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
 133                                         char *);
 134 extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
 135                                         const char *, size_t);
 136 extern ssize_t core_alua_show_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
 137                                         char *);
 138 extern ssize_t core_alua_store_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
 139                                         const char *, size_t);
 140 extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
 141                                         char *);
 142 extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
 143                                         const char *, size_t);
 144 extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
 145 extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
 146                                         size_t);
 147 extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
 148 extern ssize_t core_alua_store_secondary_status(struct se_lun *,
 149                                         const char *, size_t);
 150 extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
 151                                         char *);
 152 extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
 153                                         const char *, size_t);
 154 extern int core_setup_alua(struct se_device *);
 155 extern sense_reason_t target_alua_state_check(struct se_cmd *cmd);
 156
 157 #endif /* TARGET_CORE_ALUA_H */