[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>

1 files changed, 52 insertions, 0 deletions

diff --git a/include/target/target_core_configfs.h b/include/target/target_core_configfs.h
new file mode 100644
index 000000000000..40e6e740527c
--- /dev/null
+++ b/include/target/target_core_configfs.h
@@ -0,0 +1,52 @@
+#define TARGET_CORE_CONFIGFS_VERSION TARGET_CORE_MOD_VERSION
+
+#define TARGET_CORE_CONFIG_ROOT "/sys/kernel/config"
+
+#define TARGET_CORE_NAME_MAX_LEN        64
+#define TARGET_FABRIC_NAME_SIZE         32
+
+extern struct target_fabric_configfs *target_fabric_configfs_init(
+                                struct module *, const char *);
+extern void target_fabric_configfs_free(struct target_fabric_configfs *);
+extern int target_fabric_configfs_register(struct target_fabric_configfs *);
+extern void target_fabric_configfs_deregister(struct target_fabric_configfs *);
+
+struct target_fabric_configfs_template {
+        struct config_item_type tfc_discovery_cit;
+        struct config_item_type tfc_wwn_cit;
+        struct config_item_type tfc_tpg_cit;
+        struct config_item_type tfc_tpg_base_cit;
+        struct config_item_type tfc_tpg_lun_cit;
+        struct config_item_type tfc_tpg_port_cit;
+        struct config_item_type tfc_tpg_np_cit;
+        struct config_item_type tfc_tpg_np_base_cit;
+        struct config_item_type tfc_tpg_attrib_cit;
+        struct config_item_type tfc_tpg_param_cit;
+        struct config_item_type tfc_tpg_nacl_cit;
+        struct config_item_type tfc_tpg_nacl_base_cit;
+        struct config_item_type tfc_tpg_nacl_attrib_cit;
+        struct config_item_type tfc_tpg_nacl_auth_cit;
+        struct config_item_type tfc_tpg_nacl_param_cit;
+        struct config_item_type tfc_tpg_mappedlun_cit;
+};
+
+struct target_fabric_configfs {
+        char                    tf_name[TARGET_FABRIC_NAME_SIZE];
+        atomic_t                tf_access_cnt;
+        struct list_head        tf_list;
+        struct config_group     tf_group;
+        struct config_group     tf_disc_group;
+        struct config_group     *tf_default_groups[2];
+        /* Pointer to fabric's config_item */
+        struct config_item      *tf_fabric;
+        /* Passed from fabric modules */
+        struct config_item_type *tf_fabric_cit;
+        /* Pointer to target core subsystem */
+        struct configfs_subsystem *tf_subsys;
+        /* Pointer to fabric's struct module */
+        struct module *tf_module;
+        struct target_core_fabric_ops tf_ops;
+        struct target_fabric_configfs_template tf_cit_tmpl;
+};
+
+#define TF_CIT_TMPL(tf) (&(tf)->tf_cit_tmpl)