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>
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@ -1,6 +1,47 @@
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#ifndef BSG_H
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#define BSG_H
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struct sg_io_v4 {
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int32_t guard; /* [i] 'Q' to differentiate from v3 */
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uint32_t protocol; /* [i] 0 -> SCSI , .... */
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uint32_t subprotocol; /* [i] 0 -> SCSI command, 1 -> SCSI task
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management function, .... */
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uint32_t request_len; /* [i] in bytes */
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uint64_t request; /* [i], [*i] {SCSI: cdb} */
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uint32_t request_attr; /* [i] {SCSI: task attribute} */
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uint32_t request_tag; /* [i] {SCSI: task tag (only if flagged)} */
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uint32_t request_priority; /* [i] {SCSI: task priority} */
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uint32_t max_response_len; /* [i] in bytes */
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uint64_t response; /* [i], [*o] {SCSI: (auto)sense data} */
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/* "din_" for data in (from device); "dout_" for data out (to device) */
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uint32_t dout_xfer_len; /* [i] bytes to be transferred to device */
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uint32_t din_xfer_len; /* [i] bytes to be transferred from device */
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uint64_t dout_xferp; /* [i], [*i] */
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uint64_t din_xferp; /* [i], [*o] */
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uint32_t timeout; /* [i] units: millisecond */
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uint32_t flags; /* [i] bit mask */
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uint64_t usr_ptr; /* [i->o] unused internally */
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uint32_t spare_in; /* [i] */
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uint32_t driver_status; /* [o] 0 -> ok */
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uint32_t transport_status; /* [o] 0 -> ok */
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uint32_t device_status; /* [o] {SCSI: command completion status} */
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uint32_t retry_delay; /* [o] {SCSI: status auxiliary information} */
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uint32_t info; /* [o] additional information */
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uint32_t duration; /* [o] time to complete, in milliseconds */
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uint32_t response_len; /* [o] bytes of response actually written */
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int32_t din_resid; /* [o] actual_din_xfer_len - din_xfer_len */
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uint32_t generated_tag; /* [o] {SCSI: task tag that transport chose} */
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uint32_t spare_out; /* [o] */
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uint32_t padding;
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};
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#ifdef __KERNEL__
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#if defined(CONFIG_BLK_DEV_BSG)
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struct bsg_class_device {
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struct class_device *class_dev;
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@ -18,4 +59,6 @@ struct bsg_class_device { };
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#define bsg_unregister_disk(disk) do { } while (0)
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#endif
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#endif /* __KERNEL__ */
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#endif
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