39dca558a5
Currently, bsg doesn't make class backlinks (a process whereby you'd get a link to bsg in the device directory in the same way you get one for sg). This is because the bsg device is uninitialised, so the class device has nothing it can attach to. The fix is to make the bsg device point to the cdevice of the entity creating the bsg, necessitating changing the bsg_register_queue() prototype into a form that takes the generic device. Acked-by: FUJITA Tomonori <tomof@acm.org> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
#ifndef BSG_H
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#define BSG_H
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#define BSG_PROTOCOL_SCSI 0
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#define BSG_SUB_PROTOCOL_SCSI_CMD 0
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#define BSG_SUB_PROTOCOL_SCSI_TMF 1
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#define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2
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struct sg_io_v4 {
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__s32 guard; /* [i] 'Q' to differentiate from v3 */
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__u32 protocol; /* [i] 0 -> SCSI , .... */
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__u32 subprotocol; /* [i] 0 -> SCSI command, 1 -> SCSI task
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management function, .... */
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__u32 request_len; /* [i] in bytes */
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__u64 request; /* [i], [*i] {SCSI: cdb} */
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__u32 request_attr; /* [i] {SCSI: task attribute} */
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__u32 request_tag; /* [i] {SCSI: task tag (only if flagged)} */
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__u32 request_priority; /* [i] {SCSI: task priority} */
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__u32 max_response_len; /* [i] in bytes */
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__u64 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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__u32 dout_xfer_len; /* [i] bytes to be transferred to device */
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__u32 din_xfer_len; /* [i] bytes to be transferred from device */
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__u64 dout_xferp; /* [i], [*i] */
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__u64 din_xferp; /* [i], [*o] */
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__u32 timeout; /* [i] units: millisecond */
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__u32 flags; /* [i] bit mask */
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__u64 usr_ptr; /* [i->o] unused internally */
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__u32 spare_in; /* [i] */
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__u32 driver_status; /* [o] 0 -> ok */
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__u32 transport_status; /* [o] 0 -> ok */
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__u32 device_status; /* [o] {SCSI: command completion status} */
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__u32 retry_delay; /* [o] {SCSI: status auxiliary information} */
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__u32 info; /* [o] additional information */
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__u32 duration; /* [o] time to complete, in milliseconds */
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__u32 response_len; /* [o] bytes of response actually written */
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__s32 din_resid; /* [o] actual_din_xfer_len - din_xfer_len */
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__u32 generated_tag; /* [o] {SCSI: task tag that transport chose} */
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__u32 spare_out; /* [o] */
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__u32 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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struct device *dev;
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int minor;
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struct list_head list;
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struct request_queue *queue;
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};
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extern int bsg_register_queue(struct request_queue *, struct device *, const char *);
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extern void bsg_unregister_queue(struct request_queue *);
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#else
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#define bsg_register_queue(disk, dev, name) (0)
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#define bsg_unregister_queue(disk) do { } while (0)
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#endif
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#endif /* __KERNEL__ */
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#endif
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