From 45977d0e87ac988d04fccfb89221727aaf8d78a4 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Wed, 20 Dec 2006 11:19:32 +0100 Subject: 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 Signed-off-by: Jens Axboe --- include/linux/bsg.h | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) (limited to 'include/linux/bsg.h') diff --git a/include/linux/bsg.h b/include/linux/bsg.h index dc0d7282c4cb..0d212cc06abf 100644 --- a/include/linux/bsg.h +++ b/include/linux/bsg.h @@ -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 -- cgit