[deliverable/linux.git] / include / scsi / scsi_cmnd.h

#ifndef _SCSI_SCSI_CMND_H
#define _SCSI_SCSI_CMND_H

#include <linux/dma-mapping.h>
#include <linux/blkdev.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/scatterlist.h>
#include <scsi/scsi_device.h>

struct Scsi_Host;
struct scsi_device;
struct scsi_driver;

/*
 * 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 resid;
};

/* embedded in scsi_cmnd */
struct scsi_pointer {
	char *ptr;		/* data pointer */
	int this_residual;	/* left in this buffer */
	struct scatterlist *buffer;	/* which buffer */
	int buffers_residual;	/* how many buffers left */

        dma_addr_t dma_handle;

	volatile int Status;
	volatile int Message;
	volatile int have_data_in;
	volatile int sent_command;
	volatile int phase;
};

struct scsi_cmnd {
	struct scsi_device *device;
	struct list_head list;  /* scsi_cmnd participates in queue lists */
	struct list_head eh_entry; /* entry for the host eh_cmd_q */
	struct delayed_work abort_work;
	int eh_eflags;		/* Used by error handlr */

	/*
	 * A SCSI Command is assigned a nonzero serial_number before passed
	 * to the driver's queue command function.  The serial_number is
	 * cleared when scsi_done is entered indicating that the command
	 * has been completed.  It is a bug for LLDDs to use this number
	 * for purposes other than printk (and even that is only useful
	 * for debugging).
	 */
	unsigned long serial_number;

	/*
	 * This is set to jiffies as it was when the command was first
	 * allocated.  It is used to time how long the command has
	 * been outstanding
	 */
	unsigned long jiffies_at_alloc;

	int retries;
	int allowed;

	unsigned char prot_op;
	unsigned char prot_type;

	unsigned short cmd_len;
	enum dma_data_direction sc_data_direction;

	/* These elements define the operation we are about to perform */
	unsigned char *cmnd;


	/* These elements define the operation we ultimately want to perform */
	struct scsi_data_buffer sdb;
	struct scsi_data_buffer *prot_sdb;

	unsigned underflow;	/* Return error if less than
				   this amount is transferred */

	unsigned transfersize;	/* How much we are guaranteed to
				   transfer with each SCSI transfer
				   (ie, between disconnect / 
				   reconnects.   Probably == sector
				   size */

	struct request *request;	/* The command we are
				   	   working on */

#define SCSI_SENSE_BUFFERSIZE 	96
	unsigned char *sense_buffer;
				/* obtained by REQUEST SENSE when
				 * CHECK CONDITION is received on original
				 * command (auto-sense) */

	/* Low-level done function - can be used by low-level driver to point
	 *        to completion function.  Not used by mid/upper level code. */
	void (*scsi_done) (struct scsi_cmnd *);

	/*
	 * The following fields can be written to by the host specific code. 
	 * Everything else should be left alone. 
	 */
	struct scsi_pointer SCp;	/* Scratchpad used by some host adapters */

	unsigned char *host_scribble;	/* The host adapter is allowed to
					 * call scsi_malloc and get some memory
					 * and hang it here.  The host adapter
					 * is also expected to call scsi_free
					 * to release this memory.  (The memory
					 * obtained by scsi_malloc is guaranteed
					 * to be at an address < 16Mb). */

	int result;		/* Status code from lower level driver */

	unsigned char tag;	/* SCSI-II queued command tag */
};

/*
 * Return the driver private allocation behind the command.
 * Only works if cmd_size is set in the host template.
 */
static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd)
{
	return cmd + 1;
}

/* make sure not to use it with REQ_TYPE_BLOCK_PC commands */
static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
{
	return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
}

extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
extern void scsi_put_command(struct scsi_cmnd *);
extern void scsi_finish_command(struct scsi_cmnd *cmd);

extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
				 size_t *offset, size_t *len);
extern void scsi_kunmap_atomic_sg(void *virt);

extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask);

extern int scsi_dma_map(struct scsi_cmnd *cmd);
extern void scsi_dma_unmap(struct scsi_cmnd *cmd);

static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
{
	return cmd->sdb.table.nents;
}

static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
{
	return cmd->sdb.table.sgl;
}

static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
{
	return cmd->sdb.length;
}

static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
{
	cmd->sdb.resid = resid;
}

static inline int scsi_get_resid(struct scsi_cmnd *cmd)
{
	return cmd->sdb.resid;
}

#define scsi_for_each_sg(cmd, sg, nseg, __i)			\
	for_each_sg(scsi_sglist(cmd), sg, nseg, __i)

static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
{
	return blk_bidi_rq(cmd->request) &&
		(cmd->request->next_rq->special != NULL);
}

static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
{
	return scsi_bidi_cmnd(cmd) ?
		cmd->request->next_rq->special : &cmd->sdb;
}

static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
{
	return &cmd->sdb;
}

static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
					   void *buf, int buflen)
{
	return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
				   buf, buflen);
}

static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
					 void *buf, int buflen)
{
	return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
				 buf, buflen);
}

/*
 * The operations below are hints that tell the controller driver how
 * to handle I/Os with DIF or similar types of protection information.
 */
enum scsi_prot_operations {
	/* Normal I/O */
	SCSI_PROT_NORMAL = 0,

	/* OS-HBA: Protected, HBA-Target: Unprotected */
	SCSI_PROT_READ_INSERT,
	SCSI_PROT_WRITE_STRIP,

	/* OS-HBA: Unprotected, HBA-Target: Protected */
	SCSI_PROT_READ_STRIP,
	SCSI_PROT_WRITE_INSERT,

	/* OS-HBA: Protected, HBA-Target: Protected */
	SCSI_PROT_READ_PASS,
	SCSI_PROT_WRITE_PASS,
};

static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
{
	scmd->prot_op = op;
}

static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
{
	return scmd->prot_op;
}

/*
 * The controller usually does not know anything about the target it
 * is communicating with.  However, when DIX is enabled the controller
 * must be know target type so it can verify the protection
 * information passed along with the I/O.
 */
enum scsi_prot_target_type {
	SCSI_PROT_DIF_TYPE0 = 0,
	SCSI_PROT_DIF_TYPE1,
	SCSI_PROT_DIF_TYPE2,
	SCSI_PROT_DIF_TYPE3,
};

static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
{
	scmd->prot_type = type;
}

static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
{
	return scmd->prot_type;
}

static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
{
	return blk_rq_pos(scmd->request);
}

static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
{
	return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
}

static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
{
	return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
}

static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
{
	return cmd->prot_sdb;
}

#define scsi_for_each_prot_sg(cmd, sg, nseg, __i)		\
	for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)

static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
{
	cmd->result = (cmd->result & 0xffff00ff) | (status << 8);
}

static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
{
	cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
}

static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
{
	cmd->result = (cmd->result & 0x00ffffff) | (status << 24);
}

static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
{
	unsigned int xfer_len = scsi_out(scmd)->length;
	unsigned int prot_op = scsi_get_prot_op(scmd);
	unsigned int sector_size = scmd->device->sector_size;

	switch (prot_op) {
	case SCSI_PROT_NORMAL:
	case SCSI_PROT_WRITE_STRIP:
	case SCSI_PROT_READ_INSERT:
		return xfer_len;
	}

	return xfer_len + (xfer_len >> ilog2(sector_size)) * 8;
}

#endif /* _SCSI_SCSI_CMND_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _SCSI_SCSI_CMND_H
	2	#define _SCSI_SCSI_CMND_H
	3
	4	#include <linux/dma-mapping.h>
6f9a35e2	5	#include <linux/blkdev.h>
1da177e4 LT	6	#include <linux/list.h>
1da177e4 LT	7	#include <linux/types.h>
4e57b681	8	#include <linux/timer.h>
c6132da1	9	#include <linux/scatterlist.h>
8846bab1	10	#include <scsi/scsi_device.h>
1da177e4	11
b58d9154	12	struct Scsi_Host;
1da177e4	13	struct scsi_device;
18a4d0a2	14	struct scsi_driver;
1da177e4	15
64a87b24 BH	16	/*
	17	* MAX_COMMAND_SIZE is:
	18	* The longest fixed-length SCSI CDB as per the SCSI standard.
	19	* fixed-length means: commands that their size can be determined
	20	* by their opcode and the CDB does not carry a length specifier, (unlike
	21	* the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
	22	* true and the SCSI standard also defines extended commands and
	23	* vendor specific commands that can be bigger than 16 bytes. The kernel
	24	* will support these using the same infrastructure used for VARLEN CDB's.
	25	* So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
	26	* supports without specifying a cmd_len by ULD's
	27	*/
	28	#define MAX_COMMAND_SIZE 16
	29	#if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
	30	# error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
	31	#endif
	32
30b0c37b BH	33	struct scsi_data_buffer {
	34	struct sg_table table;
	35	unsigned length;
	36	int resid;
	37	};
1da177e4 LT	38
	39	/* embedded in scsi_cmnd */
	40	struct scsi_pointer {
	41	char ptr; / data pointer */
	42	int this_residual; /* left in this buffer */
	43	struct scatterlist buffer; / which buffer */
	44	int buffers_residual; /* how many buffers left */
	45
	46	dma_addr_t dma_handle;
	47
	48	volatile int Status;
	49	volatile int Message;
	50	volatile int have_data_in;
	51	volatile int sent_command;
	52	volatile int phase;
	53	};
	54
	55	struct scsi_cmnd {
1da177e4	56	struct scsi_device *device;
1da177e4	57	struct list_head list; /* scsi_cmnd participates in queue lists */
1da177e4	58	struct list_head eh_entry; /* entry for the host eh_cmd_q */
e494f6a7	59	struct delayed_work abort_work;
1da177e4	60	int eh_eflags; /* Used by error handlr */
1da177e4 LT	61
1da177e4 LT	62	/*
c6295cdf	63	* A SCSI Command is assigned a nonzero serial_number before passed
	64	* to the driver's queue command function. The serial_number is
	65	* cleared when scsi_done is entered indicating that the command
12a44162 MW	66	* has been completed. It is a bug for LLDDs to use this number
	67	* for purposes other than printk (and even that is only useful
	68	* for debugging).
1da177e4 LT	69	*/
1da177e4 LT	70	unsigned long serial_number;
12a44162	71
b21a4138 JB	72	/*
	73	* This is set to jiffies as it was when the command was first
	74	* allocated. It is used to time how long the command has
	75	* been outstanding
	76	*/
	77	unsigned long jiffies_at_alloc;
1da177e4 LT	78
	79	int retries;
	80	int allowed;
1da177e4	81
db007fc5 MP	82	unsigned char prot_op;
	83	unsigned char prot_type;
	84
db4742dd	85	unsigned short cmd_len;
1da177e4	86	enum dma_data_direction sc_data_direction;
1da177e4 LT	87
1da177e4 LT	88	/* These elements define the operation we are about to perform */
64a87b24	89	unsigned char *cmnd;
1da177e4	90
1da177e4 LT	91
1da177e4 LT	92	/* These elements define the operation we ultimately want to perform */
30b0c37b	93	struct scsi_data_buffer sdb;
7027ad72 MP	94	struct scsi_data_buffer *prot_sdb;
7027ad72 MP	95
1da177e4 LT	96	unsigned underflow; /* Return error if less than
1da177e4 LT	97	this amount is transferred */
1da177e4 LT	98
	99	unsigned transfersize; /* How much we are guaranteed to
	100	transfer with each SCSI transfer
	101	(ie, between disconnect /
	102	reconnects. Probably == sector
	103	size */
	104
1da177e4 LT	105	struct request request; / The command we are
	106	working on */
	107
	108	#define SCSI_SENSE_BUFFERSIZE 96
de25deb1	109	unsigned char *sense_buffer;
c67a848c MW	110	/* obtained by REQUEST SENSE when
	111	* CHECK CONDITION is received on original
	112	* command (auto-sense) */
1da177e4 LT	113
	114	/* Low-level done function - can be used by low-level driver to point
	115	* to completion function. Not used by mid/upper level code. */
	116	void (scsi_done) (struct scsi_cmnd );
	117
	118	/*
	119	* The following fields can be written to by the host specific code.
	120	* Everything else should be left alone.
	121	*/
	122	struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
	123
	124	unsigned char host_scribble; / The host adapter is allowed to
c67a848c MW	125	* call scsi_malloc and get some memory
	126	* and hang it here. The host adapter
	127	* is also expected to call scsi_free
	128	* to release this memory. (The memory
	129	* obtained by scsi_malloc is guaranteed
	130	* to be at an address < 16Mb). */
1da177e4 LT	131
	132	int result; /* Status code from lower level driver */
	133
	134	unsigned char tag; /* SCSI-II queued command tag */
1da177e4 LT	135	};
1da177e4 LT	136
b54197c4 CH	137	/*
	138	* Return the driver private allocation behind the command.
	139	* Only works if cmd_size is set in the host template.
	140	*/
	141	static inline void scsi_cmd_priv(struct scsi_cmnd cmd)
	142	{
	143	return cmd + 1;
	144	}
	145
329a402c	146	/* make sure not to use it with REQ_TYPE_BLOCK_PC commands */
18a4d0a2 MP	147	static inline struct scsi_driver scsi_cmd_to_driver(struct scsi_cmnd cmd)
18a4d0a2 MP	148	{
329a402c	149	return (struct scsi_driver *)cmd->request->rq_disk->private_data;
18a4d0a2 MP	150	}
18a4d0a2 MP	151
c53033f6	152	extern struct scsi_cmnd scsi_get_command(struct scsi_device , gfp_t);
1da177e4	153	extern void scsi_put_command(struct scsi_cmnd *);
1da177e4 LT	154	extern void scsi_finish_command(struct scsi_cmnd *cmd);
1da177e4 LT	155
cdb8c2a6 GL	156	extern void scsi_kmap_atomic_sg(struct scatterlist sg, int sg_count,
	157	size_t offset, size_t len);
	158	extern void scsi_kunmap_atomic_sg(void *virt);
	159
bb52d82f	160	extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask);
b58d9154	161
824d7b57 FT	162	extern int scsi_dma_map(struct scsi_cmnd *cmd);
	163	extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
	164
30b0c37b BH	165	static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
	166	{
	167	return cmd->sdb.table.nents;
	168	}
	169
	170	static inline struct scatterlist scsi_sglist(struct scsi_cmnd cmd)
	171	{
	172	return cmd->sdb.table.sgl;
	173	}
	174
	175	static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
	176	{
	177	return cmd->sdb.length;
	178	}
824d7b57 FT	179
	180	static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
	181	{
30b0c37b	182	cmd->sdb.resid = resid;
824d7b57 FT	183	}
	184
	185	static inline int scsi_get_resid(struct scsi_cmnd *cmd)
	186	{
30b0c37b	187	return cmd->sdb.resid;
824d7b57 FT	188	}
	189
	190	#define scsi_for_each_sg(cmd, sg, nseg, __i) \
c6132da1	191	for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
824d7b57	192
6f9a35e2 BH	193	static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
	194	{
	195	return blk_bidi_rq(cmd->request) &&
	196	(cmd->request->next_rq->special != NULL);
	197	}
	198
	199	static inline struct scsi_data_buffer scsi_in(struct scsi_cmnd cmd)
	200	{
	201	return scsi_bidi_cmnd(cmd) ?
	202	cmd->request->next_rq->special : &cmd->sdb;
	203	}
	204
	205	static inline struct scsi_data_buffer scsi_out(struct scsi_cmnd cmd)
	206	{
	207	return &cmd->sdb;
	208	}
	209
9ac16b61 FT	210	static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
	211	void *buf, int buflen)
	212	{
	213	return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	214	buf, buflen);
	215	}
	216
	217	static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
	218	void *buf, int buflen)
	219	{
	220	return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	221	buf, buflen);
	222	}
	223
db007fc5 MP	224	/*
	225	* The operations below are hints that tell the controller driver how
	226	* to handle I/Os with DIF or similar types of protection information.
	227	*/
	228	enum scsi_prot_operations {
	229	/* Normal I/O */
	230	SCSI_PROT_NORMAL = 0,
	231
	232	/* OS-HBA: Protected, HBA-Target: Unprotected */
	233	SCSI_PROT_READ_INSERT,
	234	SCSI_PROT_WRITE_STRIP,
	235
	236	/* OS-HBA: Unprotected, HBA-Target: Protected */
	237	SCSI_PROT_READ_STRIP,
	238	SCSI_PROT_WRITE_INSERT,
	239
	240	/* OS-HBA: Protected, HBA-Target: Protected */
	241	SCSI_PROT_READ_PASS,
	242	SCSI_PROT_WRITE_PASS,
db007fc5 MP	243	};
	244
	245	static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
	246	{
	247	scmd->prot_op = op;
	248	}
	249
	250	static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
	251	{
	252	return scmd->prot_op;
	253	}
	254
	255	/*
	256	* The controller usually does not know anything about the target it
	257	* is communicating with. However, when DIX is enabled the controller
	258	* must be know target type so it can verify the protection
	259	* information passed along with the I/O.
	260	*/
	261	enum scsi_prot_target_type {
	262	SCSI_PROT_DIF_TYPE0 = 0,
	263	SCSI_PROT_DIF_TYPE1,
	264	SCSI_PROT_DIF_TYPE2,
	265	SCSI_PROT_DIF_TYPE3,
	266	};
	267
	268	static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
	269	{
	270	scmd->prot_type = type;
	271	}
	272
	273	static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
	274	{
	275	return scmd->prot_type;
	276	}
	277
	278	static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
	279	{
83096ebf	280	return blk_rq_pos(scmd->request);
db007fc5 MP	281	}
db007fc5 MP	282
7027ad72 MP	283	static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
	284	{
	285	return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
	286	}
	287
	288	static inline struct scatterlist scsi_prot_sglist(struct scsi_cmnd cmd)
	289	{
	290	return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
	291	}
	292
	293	static inline struct scsi_data_buffer scsi_prot(struct scsi_cmnd cmd)
	294	{
	295	return cmd->prot_sdb;
	296	}
	297
	298	#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
	299	for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
	300
f290f197 JB	301	static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
f290f197 JB	302	{
3384db9e	303	cmd->result = (cmd->result & 0xffff00ff) \| (status << 8);
f290f197 JB	304	}
	305
	306	static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
	307	{
3384db9e	308	cmd->result = (cmd->result & 0xff00ffff) \| (status << 16);
f290f197 JB	309	}
	310
	311	static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
	312	{
3384db9e	313	cmd->result = (cmd->result & 0x00ffffff) \| (status << 24);
f290f197 JB	314	}
f290f197 JB	315
8846bab1 SG	316	static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
8846bab1 SG	317	{
5616b0a4	318	unsigned int xfer_len = scsi_out(scmd)->length;
8846bab1 SG	319	unsigned int prot_op = scsi_get_prot_op(scmd);
	320	unsigned int sector_size = scmd->device->sector_size;
	321
	322	switch (prot_op) {
	323	case SCSI_PROT_NORMAL:
	324	case SCSI_PROT_WRITE_STRIP:
	325	case SCSI_PROT_READ_INSERT:
	326	return xfer_len;
	327	}
	328
	329	return xfer_len + (xfer_len >> ilog2(sector_size)) * 8;
	330	}
	331
1da177e4	332	#endif /* _SCSI_SCSI_CMND_H */