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author | Nicholas Bellinger <nab@linux-iscsi.org> | 2010-12-17 11:11:26 -0800 |
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committer | James Bottomley <James.Bottomley@suse.de> | 2011-01-14 10:12:29 -0600 |
commit | c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 (patch) | |
tree | 71c6344688bf56ea6aaf18c586ab69ff4f077ade /drivers/target/target_core_alua.h | |
parent | f4013c3879d1bbd9f3ab8351185decd049502368 (diff) | |
download | op-kernel-dev-c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5.zip op-kernel-dev-c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5.tar.gz |
[SCSI] target: Add LIO target core v4.0.0-rc6
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>
Diffstat (limited to 'drivers/target/target_core_alua.h')
-rw-r--r-- | drivers/target/target_core_alua.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/target/target_core_alua.h b/drivers/target/target_core_alua.h new file mode 100644 index 0000000..c86f97a --- /dev/null +++ b/drivers/target/target_core_alua.h @@ -0,0 +1,126 @@ +#ifndef TARGET_CORE_ALUA_H +#define TARGET_CORE_ALUA_H + +/* + * INQUIRY response data, TPGS Field + * + * from spc4r17 section 6.4.2 Table 135 + */ +#define TPGS_NO_ALUA 0x00 +#define TPGS_IMPLICT_ALUA 0x10 +#define TPGS_EXPLICT_ALUA 0x20 + +/* + * ASYMMETRIC ACCESS STATE field + * + * from spc4r17 section 6.27 Table 245 + */ +#define ALUA_ACCESS_STATE_ACTIVE_OPTMIZED 0x0 +#define ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED 0x1 +#define ALUA_ACCESS_STATE_STANDBY 0x2 +#define ALUA_ACCESS_STATE_UNAVAILABLE 0x3 +#define ALUA_ACCESS_STATE_OFFLINE 0xe +#define ALUA_ACCESS_STATE_TRANSITION 0xf + +/* + * REPORT_TARGET_PORT_GROUP STATUS CODE + * + * from spc4r17 section 6.27 Table 246 + */ +#define ALUA_STATUS_NONE 0x00 +#define ALUA_STATUS_ALTERED_BY_EXPLICT_STPG 0x01 +#define ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA 0x02 + +/* + * From spc4r17, Table D.1: ASC and ASCQ Assignement + */ +#define ASCQ_04H_ALUA_STATE_TRANSITION 0x0a +#define ASCQ_04H_ALUA_TG_PT_STANDBY 0x0b +#define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE 0x0c +#define ASCQ_04H_ALUA_OFFLINE 0x12 + +/* + * Used as the default for Active/NonOptimized delay (in milliseconds) + * This can also be changed via configfs on a per target port group basis.. + */ +#define ALUA_DEFAULT_NONOP_DELAY_MSECS 100 +#define ALUA_MAX_NONOP_DELAY_MSECS 10000 /* 10 seconds */ +/* + * Used for implict and explict ALUA transitional delay, that is disabled + * by default, and is intended to be used for debugging client side ALUA code. + */ +#define ALUA_DEFAULT_TRANS_DELAY_MSECS 0 +#define ALUA_MAX_TRANS_DELAY_MSECS 30000 /* 30 seconds */ +/* + * Used by core_alua_update_tpg_primary_metadata() and + * core_alua_update_tpg_secondary_metadata() + */ +#define ALUA_METADATA_PATH_LEN 512 +/* + * Used by core_alua_update_tpg_secondary_metadata() + */ +#define ALUA_SECONDARY_METADATA_WWN_LEN 256 + +extern struct kmem_cache *t10_alua_lu_gp_cache; +extern struct kmem_cache *t10_alua_lu_gp_mem_cache; +extern struct kmem_cache *t10_alua_tg_pt_gp_cache; +extern struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; + +extern int core_emulate_report_target_port_groups(struct se_cmd *); +extern int core_emulate_set_target_port_groups(struct se_cmd *); +extern int core_alua_check_nonop_delay(struct se_cmd *); +extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *, + struct se_device *, struct se_port *, + struct se_node_acl *, int, int); +extern char *core_alua_dump_status(int); +extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int); +extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16); +extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *); +extern void core_alua_free_lu_gp_mem(struct se_device *); +extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *); +extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *); +extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *, + struct t10_alua_lu_gp *); +extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *, + struct t10_alua_lu_gp *); +extern void core_alua_drop_lu_gp_dev(struct se_device *); +extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp( + struct se_subsystem_dev *, const char *, int); +extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16); +extern struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( + struct se_port *); +extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *); +extern void core_alua_free_tg_pt_gp_mem(struct se_port *); +extern void __core_alua_attach_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member *, + struct t10_alua_tg_pt_gp *); +extern ssize_t core_alua_show_tg_pt_gp_info(struct se_port *, char *); +extern ssize_t core_alua_store_tg_pt_gp_info(struct se_port *, const char *, + size_t); +extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *); +extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *, + const char *, size_t); +extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *, + char *); +extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *, + const char *, size_t); +extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *, + char *); +extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *, + const char *, size_t); +extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *, + char *); +extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *, + const char *, size_t); +extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *); +extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *, + size_t); +extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *); +extern ssize_t core_alua_store_secondary_status(struct se_lun *, + const char *, size_t); +extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *, + char *); +extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *, + const char *, size_t); +extern int core_setup_alua(struct se_device *, int); + +#endif /* TARGET_CORE_ALUA_H */ |