Merge tag 'stable/for-linus-3.12-rc2-tag' of git://git.kernel.org/pub/scm/linux/kerne...

[karo-tx-linux.git] / include / target / target_core_fabric.h

diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h
index 7a16178424f9af3e9ac57eceb1629eda100fb0b9..882b650e32be1d51b9945f4c475e5adcc79b523a 100644 (file)
--- a/include/target/target_core_fabric.h
+++ b/include/target/target_core_fabric.h
@@ -84,6 +84,9 @@ struct target_core_fabric_ops {
 };
 
 struct se_session *transport_init_session(void);
+int transport_alloc_session_tags(struct se_session *, unsigned int,
+               unsigned int);
+struct se_session *transport_init_session_tags(unsigned int, unsigned int);
 void   __transport_register_session(struct se_portal_group *,
                struct se_node_acl *, struct se_session *, void *);
 void   transport_register_session(struct se_portal_group *,
@@ -131,6 +134,7 @@ int core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t);
 void   core_tmr_release_req(struct se_tmr_req *);
 int    transport_generic_handle_tmr(struct se_cmd *);
 void   transport_generic_request_failure(struct se_cmd *, sense_reason_t);
+void   __target_execute_cmd(struct se_cmd *);
 int    transport_lookup_tmr_lun(struct se_cmd *, u32);
 
 struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *,
@@ -175,4 +179,30 @@ u32        iscsi_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl *
 char   *iscsi_parse_pr_out_transport_id(struct se_portal_group *, const char *,
                u32 *, char **);
 
+/*
+ * The LIO target core uses DMA_TO_DEVICE to mean that data is going
+ * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
+ * that data is coming from the target (eg handling a READ).  However,
+ * this is just the opposite of what we have to tell the DMA mapping
+ * layer -- eg when handling a READ, the HBA will have to DMA the data
+ * out of memory so it can send it to the initiator, which means we
+ * need to use DMA_TO_DEVICE when we map the data.
+ */
+static inline enum dma_data_direction
+target_reverse_dma_direction(struct se_cmd *se_cmd)
+{
+       if (se_cmd->se_cmd_flags & SCF_BIDI)
+               return DMA_BIDIRECTIONAL;
+
+       switch (se_cmd->data_direction) {
+       case DMA_TO_DEVICE:
+               return DMA_FROM_DEVICE;
+       case DMA_FROM_DEVICE:
+               return DMA_TO_DEVICE;
+       case DMA_NONE:
+       default:
+               return DMA_NONE;
+       }
+}
+
 #endif /* TARGET_CORE_FABRICH */