drivers/target/target_core_alua.h

   1 #ifndef TARGET_CORE_ALUA_H
   2 #define TARGET_CORE_ALUA_H
   3
   4 #include <target/target_core_base.h>
   5
   6 /*
   7  * INQUIRY response data, TPGS Field
   8  *
   9  * from spc4r17 section 6.4.2 Table 135
  10  */
  11 #define TPGS_NO_ALUA                            0x00
  12 #define TPGS_IMPLICIT_ALUA                      0x10
  13 #define TPGS_EXPLICIT_ALUA                      0x20
  14
  15 /*
  16  * ASYMMETRIC ACCESS STATE field
  17  *
  18  * from spc4r36j section 6.37 Table 307
  19  */
  20 #define ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED      0x0
  21 #define ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED  0x1
  22 #define ALUA_ACCESS_STATE_STANDBY               0x2
  23 #define ALUA_ACCESS_STATE_UNAVAILABLE           0x3
  24 #define ALUA_ACCESS_STATE_LBA_DEPENDENT         0x4
  25 #define ALUA_ACCESS_STATE_OFFLINE               0xe
  26 #define ALUA_ACCESS_STATE_TRANSITION            0xf
  27
  28 /*
  29  * from spc4r36j section 6.37 Table 306
  30  */
  31 #define ALUA_T_SUP              0x80
  32 #define ALUA_O_SUP              0x40
  33 #define ALUA_LBD_SUP            0x10
  34 #define ALUA_U_SUP              0x08
  35 #define ALUA_S_SUP              0x04
  36 #define ALUA_AN_SUP             0x02
  37 #define ALUA_AO_SUP             0x01
  38
  39 /*
  40  * REPORT_TARGET_PORT_GROUP STATUS CODE
  41  *
  42  * from spc4r17 section 6.27 Table 246
  43  */
  44 #define ALUA_STATUS_NONE                                0x00
  45 #define ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG            0x01
  46 #define ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA            0x02
  47
  48 /*
  49  * From spc4r17, Table D.1: ASC and ASCQ Assignement
  50  */
  51 #define ASCQ_04H_ALUA_STATE_TRANSITION                  0x0a
  52 #define ASCQ_04H_ALUA_TG_PT_STANDBY                     0x0b
  53 #define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE                 0x0c
  54 #define ASCQ_04H_ALUA_OFFLINE                           0x12
  55
  56 /*
  57  * Used as the default for Active/NonOptimized delay (in milliseconds)
  58  * This can also be changed via configfs on a per target port group basis..
  59  */
  60 #define ALUA_DEFAULT_NONOP_DELAY_MSECS                  100
  61 #define ALUA_MAX_NONOP_DELAY_MSECS                      10000 /* 10 seconds */
  62 /*
  63  * Used for implicit and explicit ALUA transitional delay, that is disabled
  64  * by default, and is intended to be used for debugging client side ALUA code.
  65  */
  66 #define ALUA_DEFAULT_TRANS_DELAY_MSECS                  0
  67 #define ALUA_MAX_TRANS_DELAY_MSECS                      30000 /* 30 seconds */
  68 /*
  69  * Used for the recommended application client implicit transition timeout
  70  * in seconds, returned by the REPORT_TARGET_PORT_GROUPS w/ extended header.
  71  */
  72 #define ALUA_DEFAULT_IMPLICIT_TRANS_SECS                        0
  73 #define ALUA_MAX_IMPLICIT_TRANS_SECS                    255
  74 /*
  75  * Used by core_alua_update_tpg_primary_metadata() and
  76  * core_alua_update_tpg_secondary_metadata()
  77  */
  78 #define ALUA_METADATA_PATH_LEN                          512
  79 /*
  80  * Used by core_alua_update_tpg_secondary_metadata()
  81  */
  82 #define ALUA_SECONDARY_METADATA_WWN_LEN                 256
  83
  84 /* Used by core_alua_update_tpg_(primary,secondary)_metadata */
  85 #define ALUA_MD_BUF_LEN                                 1024
  86
  87 extern struct kmem_cache *t10_alua_lu_gp_cache;
  88 extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
  89 extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
  90 extern struct kmem_cache *t10_alua_lba_map_cache;
  91 extern struct kmem_cache *t10_alua_lba_map_mem_cache;
  92
  93 extern sense_reason_t target_emulate_report_target_port_groups(struct se_cmd *);
  94 extern sense_reason_t target_emulate_set_target_port_groups(struct se_cmd *);
  95 extern sense_reason_t target_emulate_report_referrals(struct se_cmd *);
  96 extern int core_alua_check_nonop_delay(struct se_cmd *);
  97 extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *,
  98                                 struct se_device *, struct se_lun *,
  99                                 struct se_node_acl *, int, int);
 100 extern char *core_alua_dump_status(int);
 101 extern struct t10_alua_lba_map *core_alua_allocate_lba_map(
 102                                 struct list_head *, u64, u64);
 103 extern int core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *, int, int);
 104 extern void core_alua_free_lba_map(struct list_head *);
 105 extern void core_alua_set_lba_map(struct se_device *, struct list_head *,
 106                                 int, int);
 107 extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
 108 extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
 109 extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
 110 extern void core_alua_free_lu_gp_mem(struct se_device *);
 111 extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
 112 extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
 113 extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
 114                                         struct t10_alua_lu_gp *);
 115 extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
 116                                         struct t10_alua_lu_gp *);
 117 extern void core_alua_drop_lu_gp_dev(struct se_device *);
 118 extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
 119                         struct se_device *, const char *, int);
 120 extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
 121 extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
 122 extern void target_detach_tg_pt_gp(struct se_lun *);
 123 extern void target_attach_tg_pt_gp(struct se_lun *, struct t10_alua_tg_pt_gp *);
 124 extern ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *, char *);
 125 extern ssize_t core_alua_store_tg_pt_gp_info(struct se_lun *, const char *,
 126                                                 size_t);
 127 extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
 128 extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
 129                                         const char *, size_t);
 130 extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
 131                                                 char *);
 132 extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
 133                                         const char *, size_t);
 134 extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
 135                                         char *);
 136 extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
 137                                         const char *, size_t);
 138 extern ssize_t core_alua_show_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
 139                                         char *);
 140 extern ssize_t core_alua_store_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
 141                                         const char *, size_t);
 142 extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
 143                                         char *);
 144 extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
 145                                         const char *, size_t);
 146 extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
 147 extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
 148                                         size_t);
 149 extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
 150 extern ssize_t core_alua_store_secondary_status(struct se_lun *,
 151                                         const char *, size_t);
 152 extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
 153                                         char *);
 154 extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
 155                                         const char *, size_t);
 156 extern int core_setup_alua(struct se_device *);
 157 extern sense_reason_t target_alua_state_check(struct se_cmd *cmd);
 158
 159 #endif /* TARGET_CORE_ALUA_H */