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target_core_alua: Referrals infrastructure

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Add infrastructure for referrals.

v2 changes:

 - Fix unsigned long long division in core_alua_state_lba_dependent on
   32-bit  (Fengguang + Chen + Hannes)
 - Fix compile warning in core_alua_state_lba_dependent (nab)
 - Convert segment_* + sectors variables in core_alua_state_lba_dependent
   to u64 (Hannes)

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Hannes Reinecke
2013-12-17 09:18:49 +01:00
committed by Nicholas Bellinger
parent fbfe858fea
commit c66094bf32
8 changed files with 210 additions and 3 deletions
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18
include/target/target_core_base.h
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@@ -247,10 +247,28 @@ typedef enum {
struct se_cmd;
struct t10_alua_lba_map_member {
struct list_head lba_map_mem_list;
int lba_map_mem_alua_state;
int lba_map_mem_alua_pg_id;
};
struct t10_alua_lba_map {
u64 lba_map_first_lba;
u64 lba_map_last_lba;
struct list_head lba_map_list;
struct list_head lba_map_mem_list;
};
struct t10_alua {
/* ALUA Target Port Group ID */
u16 alua_tg_pt_gps_counter;
u32 alua_tg_pt_gps_count;
/* Referrals support */
spinlock_t lba_map_lock;
u32 lba_map_segment_size;
u32 lba_map_segment_multiplier;
struct list_head lba_map_list;
spinlock_t tg_pt_gps_lock;
struct se_device *t10_dev;
/* Used for default ALUA Target Port Group */