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LIO target is a full featured in-kernel target framework with the
following feature set:
High-performance, non-blocking, multithreaded architecture with SIMD
support.
Advanced SCSI feature set:
* Persistent Reservations (PRs)
* Asymmetric Logical Unit Assignment (ALUA)
* Protocol and intra-nexus multiplexing, load-balancing and failover (MC/S)
* Full Error Recovery (ERL=0,1,2)
* Active/active task migration and session continuation (ERL=2)
* Thin LUN provisioning (UNMAP and WRITE_SAMExx)
Multiprotocol target plugins
Storage media independence:
* Virtualization of all storage media; transparent mapping of IO to LUNs
* No hard limits on number of LUNs per Target; maximum LUN size ~750 TB
* Backstores: SATA, SAS, SCSI, BluRay, DVD, FLASH, USB, ramdisk, etc.
Standards compliance:
* Full compliance with IETF (RFC 3720)
* Full implementation of SPC-4 PRs and ALUA
Significant code cleanups done by Christoph Hellwig.
[jejb: fix up for new block bdev exclusive interface. Minor fixes from
Randy Dunlap and Dan Carpenter.]
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
127 lines
5.0 KiB
C
127 lines
5.0 KiB
C
#ifndef TARGET_CORE_ALUA_H
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#define TARGET_CORE_ALUA_H
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/*
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* INQUIRY response data, TPGS Field
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*
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* from spc4r17 section 6.4.2 Table 135
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*/
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#define TPGS_NO_ALUA 0x00
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#define TPGS_IMPLICT_ALUA 0x10
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#define TPGS_EXPLICT_ALUA 0x20
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/*
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* ASYMMETRIC ACCESS STATE field
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*
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* from spc4r17 section 6.27 Table 245
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*/
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#define ALUA_ACCESS_STATE_ACTIVE_OPTMIZED 0x0
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#define ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED 0x1
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#define ALUA_ACCESS_STATE_STANDBY 0x2
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#define ALUA_ACCESS_STATE_UNAVAILABLE 0x3
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#define ALUA_ACCESS_STATE_OFFLINE 0xe
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#define ALUA_ACCESS_STATE_TRANSITION 0xf
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/*
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* REPORT_TARGET_PORT_GROUP STATUS CODE
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*
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* from spc4r17 section 6.27 Table 246
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*/
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#define ALUA_STATUS_NONE 0x00
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#define ALUA_STATUS_ALTERED_BY_EXPLICT_STPG 0x01
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#define ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA 0x02
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/*
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* From spc4r17, Table D.1: ASC and ASCQ Assignement
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*/
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#define ASCQ_04H_ALUA_STATE_TRANSITION 0x0a
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#define ASCQ_04H_ALUA_TG_PT_STANDBY 0x0b
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#define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE 0x0c
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#define ASCQ_04H_ALUA_OFFLINE 0x12
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/*
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* Used as the default for Active/NonOptimized delay (in milliseconds)
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* This can also be changed via configfs on a per target port group basis..
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*/
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#define ALUA_DEFAULT_NONOP_DELAY_MSECS 100
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#define ALUA_MAX_NONOP_DELAY_MSECS 10000 /* 10 seconds */
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/*
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* Used for implict and explict ALUA transitional delay, that is disabled
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* by default, and is intended to be used for debugging client side ALUA code.
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*/
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#define ALUA_DEFAULT_TRANS_DELAY_MSECS 0
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#define ALUA_MAX_TRANS_DELAY_MSECS 30000 /* 30 seconds */
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/*
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* Used by core_alua_update_tpg_primary_metadata() and
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* core_alua_update_tpg_secondary_metadata()
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*/
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#define ALUA_METADATA_PATH_LEN 512
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/*
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* Used by core_alua_update_tpg_secondary_metadata()
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*/
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#define ALUA_SECONDARY_METADATA_WWN_LEN 256
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extern struct kmem_cache *t10_alua_lu_gp_cache;
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extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
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extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
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extern struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
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extern int core_emulate_report_target_port_groups(struct se_cmd *);
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extern int core_emulate_set_target_port_groups(struct se_cmd *);
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extern int core_alua_check_nonop_delay(struct se_cmd *);
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extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *,
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struct se_device *, struct se_port *,
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struct se_node_acl *, int, int);
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extern char *core_alua_dump_status(int);
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extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
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extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
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extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
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extern void core_alua_free_lu_gp_mem(struct se_device *);
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extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
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extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
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extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
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struct t10_alua_lu_gp *);
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extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
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struct t10_alua_lu_gp *);
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extern void core_alua_drop_lu_gp_dev(struct se_device *);
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extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
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struct se_subsystem_dev *, const char *, int);
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extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
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extern struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
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struct se_port *);
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extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
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extern void core_alua_free_tg_pt_gp_mem(struct se_port *);
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extern void __core_alua_attach_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member *,
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struct t10_alua_tg_pt_gp *);
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extern ssize_t core_alua_show_tg_pt_gp_info(struct se_port *, char *);
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extern ssize_t core_alua_store_tg_pt_gp_info(struct se_port *, const char *,
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size_t);
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extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
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extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
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const char *, size_t);
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extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
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char *);
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extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
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const char *, size_t);
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extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
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char *);
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extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
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const char *, size_t);
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extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
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char *);
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extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
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const char *, size_t);
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extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
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extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
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size_t);
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extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
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extern ssize_t core_alua_store_secondary_status(struct se_lun *,
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const char *, size_t);
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extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
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char *);
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extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
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const char *, size_t);
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extern int core_setup_alua(struct se_device *, int);
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#endif /* TARGET_CORE_ALUA_H */
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