diff options
Diffstat (limited to 'include/scsi/scsi_cmnd.h')
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index 8d20e60a94b..7ed883c8e48 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -7,10 +7,28 @@ #include <linux/types.h> #include <linux/timer.h> #include <linux/scatterlist.h> +#include <linux/blkdev.h> 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; @@ -64,8 +82,7 @@ struct scsi_cmnd { 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. */ |