root/include/linux/bsg.h

INCLUDED FROM

DEFINITIONS

1. bsg_register_queue
2. bsg_unregister_queue

#ifndef BSG_H
#define BSG_H

#define BSG_PROTOCOL_SCSI               0

#define BSG_SUB_PROTOCOL_SCSI_CMD       0
#define BSG_SUB_PROTOCOL_SCSI_TMF       1
#define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2

struct sg_io_v4 {
        __s32 guard;            /* [i] 'Q' to differentiate from v3 */
        __u32 protocol;         /* [i] 0 -> SCSI , .... */
        __u32 subprotocol;      /* [i] 0 -> SCSI command, 1 -> SCSI task
                                   management function, .... */

        __u32 request_len;      /* [i] in bytes */
        __u64 request;          /* [i], [*i] {SCSI: cdb} */
        __u64 request_tag;      /* [i] {SCSI: task tag (only if flagged)} */
        __u32 request_attr;     /* [i] {SCSI: task attribute} */
        __u32 request_priority; /* [i] {SCSI: task priority} */
        __u32 request_extra;    /* [i] {spare, for padding} */
        __u32 max_response_len; /* [i] in bytes */
        __u64 response;         /* [i], [*o] {SCSI: (auto)sense data} */

        /* "dout_": data out (to device); "din_": data in (from device) */
        __u32 dout_iovec_count; /* [i] 0 -> "flat" dout transfer else
                                   dout_xfer points to array of iovec */
        __u32 dout_xfer_len;    /* [i] bytes to be transferred to device */
        __u32 din_iovec_count;  /* [i] 0 -> "flat" din transfer */
        __u32 din_xfer_len;     /* [i] bytes to be transferred from device */
        __u64 dout_xferp;       /* [i], [*i] */
        __u64 din_xferp;        /* [i], [*o] */

        __u32 timeout;          /* [i] units: millisecond */
        __u32 flags;            /* [i] bit mask */
        __u64 usr_ptr;          /* [i->o] unused internally */
        __u32 spare_in;         /* [i] */

        __u32 driver_status;    /* [o] 0 -> ok */
        __u32 transport_status; /* [o] 0 -> ok */
        __u32 device_status;    /* [o] {SCSI: command completion status} */
        __u32 retry_delay;      /* [o] {SCSI: status auxiliary information} */
        __u32 info;             /* [o] additional information */
        __u32 duration;         /* [o] time to complete, in milliseconds */
        __u32 response_len;     /* [o] bytes of response actually written */
        __s32 din_resid;        /* [o] din_xfer_len - actual_din_xfer_len */
        __s32 dout_resid;       /* [o] dout_xfer_len - actual_dout_xfer_len */
        __u64 generated_tag;    /* [o] {SCSI: transport generated task tag} */
        __u32 spare_out;        /* [o] */

        __u32 padding;
};

#ifdef __KERNEL__

#if defined(CONFIG_BLK_DEV_BSG)
struct bsg_class_device {
        struct device *class_dev;
        struct device *parent;
        int minor;
        struct request_queue *queue;
        struct kref ref;
        void (*release)(struct device *);
};

extern int bsg_register_queue(struct request_queue *q,
                              struct device *parent, const char *name,
                              void (*release)(struct device *));
extern void bsg_unregister_queue(struct request_queue *);
#else
static inline int bsg_register_queue(struct request_queue *q,
                                     struct device *parent, const char *name,
                                     void (*release)(struct device *))
{
        return 0;
}
static inline void bsg_unregister_queue(struct request_queue *q)
{
}
#endif

#endif /* __KERNEL__ */

#endif