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.
Doug, could you comment on this?
Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
---
include/scsi/sg.h | 39 +++++++++++++++++++++++++++++++++++++++
1 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/include/scsi/sg.h b/include/scsi/sg.h
index 519c49a..3877fb3 100644
--- a/include/scsi/sg.h
+++ b/include/scsi/sg.h
@@ -107,6 +107,45 @@ typedef struct sg_io_hdr
unsigned int info; /* [o] auxiliary information */
} sg_io_hdr_t; /* 64 bytes long (on i386) */
+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;
+};
+
#define SG_INTERFACE_ID_ORIG 'S'
/* Use negative values to flag difference from original sg_header structure */
--
1.4.1.1
-
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