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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: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
FUJITA Tomonori 2006-12-20 11:19:32 +01:00 committed by Jens Axboe
parent 337ad41dea
commit 45977d0e87
1 changed files with 43 additions and 0 deletions
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43
include/linux/bsg.h
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@ -1,6 +1,47 @@
#ifndef 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)
struct bsg_class_device {
struct class_device *class_dev;
@ -18,4 +59,6 @@ struct bsg_class_device { };
#define bsg_unregister_disk(disk) do { } while (0)
#endif
#endif /* __KERNEL__ */
#endif