target: move code for CDB emulation

Move the existing code in target_core_cdb.c into the files for the command
sets that the emulations implement.

(roland + nab: Squash patch: Fix range calculation in WRITE SAME emulation
 when num blocks == 0s)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h
index f4f1eef..24d2004 100644
--- a/include/target/target_core_backend.h
+++ b/include/target/target_core_backend.h
@@ -25,7 +25,7 @@
 	void (*free_device)(void *);
 	int (*transport_complete)(struct se_cmd *cmd, struct scatterlist *);
 
-	int (*parse_cdb)(struct se_cmd *cmd, unsigned int *size);
+	int (*parse_cdb)(struct se_cmd *cmd);
 	int (*execute_cmd)(struct se_cmd *, struct scatterlist *, u32,
 			enum dma_data_direction);
 	int (*do_discard)(struct se_device *, sector_t, u32);
@@ -51,8 +51,8 @@
 
 void	target_complete_cmd(struct se_cmd *, u8);
 
-int	sbc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
-int	spc_parse_cdb(struct se_cmd *cmd, unsigned int *size, bool passthrough);
+int	sbc_parse_cdb(struct se_cmd *cmd);
+int	spc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
 
 void	transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
 int	transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);