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Commit 45977d0e authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Jens Axboe
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bsg: add sg_io_v4 structure 



This patch adds sg_io_v4 structure that Doug proposed last month.

There's one major change from the RFC. I dropped iovec, which needs
compat stuff. The bsg code simply calls blk_rq_map_user against
dout_xferp/din_xferp. So if possible, the page frames are directly
mapped. If not possible, the block layer allocates new page frames and
does memory copies.

Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 337ad41d

include/linux/bsg.h

+43 −0
Original line number Original line Diff line number Diff line 
#ifndef BSG_H

#ifndef BSG_H

#define BSG_H

#define BSG_H





struct sg_io_v4 {

	int32_t guard;		/* [i] 'Q' to differentiate from v3 */

	uint32_t protocol;	/* [i] 0 -> SCSI , .... */

	uint32_t subprotocol;	/* [i] 0 -> SCSI command, 1 -> SCSI task

				   management function, .... */



	uint32_t request_len;	/* [i] in bytes */

	uint64_t request;	/* [i], [*i] {SCSI: cdb} */

	uint32_t request_attr;	/* [i] {SCSI: task attribute} */

	uint32_t request_tag;	/* [i] {SCSI: task tag (only if flagged)} */

	uint32_t request_priority;	/* [i] {SCSI: task priority} */

	uint32_t max_response_len;	/* [i] in bytes */

	uint64_t response;	/* [i], [*o] {SCSI: (auto)sense data} */



	/* "din_" for data in (from device); "dout_" for data out (to device) */

	uint32_t dout_xfer_len;	/* [i] bytes to be transferred to device */

	uint32_t din_xfer_len;	/* [i] bytes to be transferred from device */

	uint64_t dout_xferp;	/* [i], [*i] */

	uint64_t din_xferp;	/* [i], [*o] */



	uint32_t timeout;	/* [i] units: millisecond */

	uint32_t flags;		/* [i] bit mask */

	uint64_t usr_ptr;	/* [i->o] unused internally */

	uint32_t spare_in;	/* [i] */



	uint32_t driver_status;	/* [o] 0 -> ok */

	uint32_t transport_status;	/* [o] 0 -> ok */

	uint32_t device_status;	/* [o] {SCSI: command completion status} */

	uint32_t retry_delay;	/* [o] {SCSI: status auxiliary information} */

	uint32_t info;		/* [o] additional information */

	uint32_t duration;	/* [o] time to complete, in milliseconds */

	uint32_t response_len;	/* [o] bytes of response actually written */

	int32_t din_resid;	/* [o] actual_din_xfer_len - din_xfer_len */

	uint32_t generated_tag;	/* [o] {SCSI: task tag that transport chose} */

	uint32_t spare_out;	/* [o] */



	uint32_t padding;

};



#ifdef __KERNEL__



#if defined(CONFIG_BLK_DEV_BSG)

#if defined(CONFIG_BLK_DEV_BSG)

struct bsg_class_device {

struct bsg_class_device {

	struct class_device *class_dev;

	struct class_device *class_dev;
@@ -18,4 +59,6 @@ struct bsg_class_device { }; 
#define bsg_unregister_disk(disk)	do { } while (0)

#define bsg_unregister_disk(disk)	do { } while (0)

#endif

#endif





#endif /* __KERNEL__ */



#endif
 
#endif