root/drivers/target/target_core_alua.h

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INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef TARGET_CORE_ALUA_H
   3 #define TARGET_CORE_ALUA_H
   4 
   5 #include <target/target_core_base.h>
   6 
   7 /*
   8  * INQUIRY response data, TPGS Field
   9  *
  10  * from spc4r17 section 6.4.2 Table 135
  11  */
  12 #define TPGS_NO_ALUA                            0x00
  13 #define TPGS_IMPLICIT_ALUA                      0x10
  14 #define TPGS_EXPLICIT_ALUA                      0x20
  15 
  16 /*
  17  * ASYMMETRIC ACCESS STATE field
  18  *
  19  * from spc4r36j section 6.37 Table 307
  20  */
  21 #define ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED      0x0
  22 #define ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED  0x1
  23 #define ALUA_ACCESS_STATE_STANDBY               0x2
  24 #define ALUA_ACCESS_STATE_UNAVAILABLE           0x3
  25 #define ALUA_ACCESS_STATE_LBA_DEPENDENT         0x4
  26 #define ALUA_ACCESS_STATE_OFFLINE               0xe
  27 #define ALUA_ACCESS_STATE_TRANSITION            0xf
  28 
  29 /*
  30  * from spc4r36j section 6.37 Table 306
  31  */
  32 #define ALUA_T_SUP              0x80
  33 #define ALUA_O_SUP              0x40
  34 #define ALUA_LBD_SUP            0x10
  35 #define ALUA_U_SUP              0x08
  36 #define ALUA_S_SUP              0x04
  37 #define ALUA_AN_SUP             0x02
  38 #define ALUA_AO_SUP             0x01
  39 
  40 /*
  41  * REPORT_TARGET_PORT_GROUP STATUS CODE
  42  *
  43  * from spc4r17 section 6.27 Table 246
  44  */
  45 #define ALUA_STATUS_NONE                                0x00
  46 #define ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG            0x01
  47 #define ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA            0x02
  48 
  49 /*
  50  * From spc4r17, Table D.1: ASC and ASCQ Assignement
  51  */
  52 #define ASCQ_04H_ALUA_STATE_TRANSITION                  0x0a
  53 #define ASCQ_04H_ALUA_TG_PT_STANDBY                     0x0b
  54 #define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE                 0x0c
  55 #define ASCQ_04H_ALUA_OFFLINE                           0x12
  56 
  57 /*
  58  * Used as the default for Active/NonOptimized delay (in milliseconds)
  59  * This can also be changed via configfs on a per target port group basis..
  60  */
  61 #define ALUA_DEFAULT_NONOP_DELAY_MSECS                  100
  62 #define ALUA_MAX_NONOP_DELAY_MSECS                      10000 /* 10 seconds */
  63 /*
  64  * Used for implicit and explicit ALUA transitional delay, that is disabled
  65  * by default, and is intended to be used for debugging client side ALUA code.
  66  */
  67 #define ALUA_DEFAULT_TRANS_DELAY_MSECS                  0
  68 #define ALUA_MAX_TRANS_DELAY_MSECS                      30000 /* 30 seconds */
  69 /*
  70  * Used for the recommended application client implicit transition timeout
  71  * in seconds, returned by the REPORT_TARGET_PORT_GROUPS w/ extended header.
  72  */
  73 #define ALUA_DEFAULT_IMPLICIT_TRANS_SECS                        0
  74 #define ALUA_MAX_IMPLICIT_TRANS_SECS                    255
  75 
  76 /* Used by core_alua_update_tpg_(primary,secondary)_metadata */
  77 #define ALUA_MD_BUF_LEN                                 1024
  78 
  79 extern struct kmem_cache *t10_alua_lu_gp_cache;
  80 extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
  81 extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
  82 extern struct kmem_cache *t10_alua_lba_map_cache;
  83 extern struct kmem_cache *t10_alua_lba_map_mem_cache;
  84 
  85 extern sense_reason_t target_emulate_report_target_port_groups(struct se_cmd *);
  86 extern sense_reason_t target_emulate_set_target_port_groups(struct se_cmd *);
  87 extern sense_reason_t target_emulate_report_referrals(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_lun *,
  91                                 struct se_node_acl *, int, int);
  92 extern char *core_alua_dump_status(int);
  93 extern struct t10_alua_lba_map *core_alua_allocate_lba_map(
  94                                 struct list_head *, u64, u64);
  95 extern int core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *, int, int);
  96 extern void core_alua_free_lba_map(struct list_head *);
  97 extern void core_alua_set_lba_map(struct se_device *, struct list_head *,
  98                                 int, int);
  99 extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
 100 extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
 101 extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
 102 extern void core_alua_free_lu_gp_mem(struct se_device *);
 103 extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
 104 extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
 105 extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
 106                                         struct t10_alua_lu_gp *);
 107 extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
 108                                         struct t10_alua_lu_gp *);
 109 extern void core_alua_drop_lu_gp_dev(struct se_device *);
 110 extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
 111                         struct se_device *, const char *, int);
 112 extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
 113 extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
 114 extern void target_detach_tg_pt_gp(struct se_lun *);
 115 extern void target_attach_tg_pt_gp(struct se_lun *, struct t10_alua_tg_pt_gp *);
 116 extern ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *, char *);
 117 extern ssize_t core_alua_store_tg_pt_gp_info(struct se_lun *, const char *,
 118                                                 size_t);
 119 extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
 120 extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
 121                                         const char *, size_t);
 122 extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
 123                                                 char *);
 124 extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
 125                                         const char *, size_t);
 126 extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
 127                                         char *);
 128 extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
 129                                         const char *, size_t);
 130 extern ssize_t core_alua_show_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
 131                                         char *);
 132 extern ssize_t core_alua_store_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
 133                                         const char *, size_t);
 134 extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
 135                                         char *);
 136 extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
 137                                         const char *, size_t);
 138 extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
 139 extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
 140                                         size_t);
 141 extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
 142 extern ssize_t core_alua_store_secondary_status(struct se_lun *,
 143                                         const char *, size_t);
 144 extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
 145                                         char *);
 146 extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
 147                                         const char *, size_t);
 148 extern int core_setup_alua(struct se_device *);
 149 extern sense_reason_t target_alua_state_check(struct se_cmd *cmd);
 150 
 151 #endif /* TARGET_CORE_ALUA_H */
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