struct Scsi_Host;
struct scsi_device;
+/*
+ * MAX_COMMAND_SIZE is:
+ * The longest fixed-length SCSI CDB as per the SCSI standard.
+ * fixed-length means: commands that their size can be determined
+ * by their opcode and the CDB does not carry a length specifier, (unlike
+ * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
+ * true and the SCSI standard also defines extended commands and
+ * vendor specific commands that can be bigger than 16 bytes. The kernel
+ * will support these using the same infrastructure used for VARLEN CDB's.
+ * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
+ * supports without specifying a cmd_len by ULD's
+ */
+#define MAX_COMMAND_SIZE 16
+#if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
+# error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
+#endif
+
struct scsi_data_buffer {
struct sg_table table;
unsigned length;
int allowed;
int timeout_per_command;
- unsigned char cmd_len;
+ unsigned short cmd_len;
enum dma_data_direction sc_data_direction;
/* These elements define the operation we are about to perform */
-#define MAX_COMMAND_SIZE 16
- unsigned char cmnd[MAX_COMMAND_SIZE];
+ unsigned char *cmnd;
struct timer_list eh_timeout; /* Used to time out the command. */
extern int scsi_dma_map(struct scsi_cmnd *cmd);
extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
+struct scsi_cmnd *scsi_allocate_command(gfp_t gfp_mask);
+void scsi_free_command(gfp_t gfp_mask, struct scsi_cmnd *cmd);
+
static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
{
return cmd->sdb.table.nents;