include/linux/bsg.h

   1 #ifndef BSG_H
   2 #define BSG_H
   3
   4 struct sg_io_v4 {
   5         __s32 guard;            /* [i] 'Q' to differentiate from v3 */
   6         __u32 protocol;         /* [i] 0 -> SCSI , .... */
   7         __u32 subprotocol;      /* [i] 0 -> SCSI command, 1 -> SCSI task
   8                                    management function, .... */
   9
  10         __u32 request_len;      /* [i] in bytes */
  11         __u64 request;          /* [i], [*i] {SCSI: cdb} */
  12         __u32 request_attr;     /* [i] {SCSI: task attribute} */
  13         __u32 request_tag;      /* [i] {SCSI: task tag (only if flagged)} */
  14         __u32 request_priority; /* [i] {SCSI: task priority} */
  15         __u32 max_response_len; /* [i] in bytes */
  16         __u64 response;         /* [i], [*o] {SCSI: (auto)sense data} */
  17
  18         /* "din_" for data in (from device); "dout_" for data out (to device) */
  19         __u32 dout_xfer_len;    /* [i] bytes to be transferred to device */
  20         __u32 din_xfer_len;     /* [i] bytes to be transferred from device */
  21         __u64 dout_xferp;       /* [i], [*i] */
  22         __u64 din_xferp;        /* [i], [*o] */
  23
  24         __u32 timeout;          /* [i] units: millisecond */
  25         __u32 flags;            /* [i] bit mask */
  26         __u64 usr_ptr;          /* [i->o] unused internally */
  27         __u32 spare_in;         /* [i] */
  28
  29         __u32 driver_status;    /* [o] 0 -> ok */
  30         __u32 transport_status; /* [o] 0 -> ok */
  31         __u32 device_status;    /* [o] {SCSI: command completion status} */
  32         __u32 retry_delay;      /* [o] {SCSI: status auxiliary information} */
  33         __u32 info;             /* [o] additional information */
  34         __u32 duration;         /* [o] time to complete, in milliseconds */
  35         __u32 response_len;     /* [o] bytes of response actually written */
  36         __s32 din_resid;        /* [o] actual_din_xfer_len - din_xfer_len */
  37         __u32 generated_tag;    /* [o] {SCSI: task tag that transport chose} */
  38         __u32 spare_out;        /* [o] */
  39
  40         __u32 padding;
  41 };
  42
  43 #ifdef __KERNEL__
  44
  45 #if defined(CONFIG_BLK_DEV_BSG)
  46 struct bsg_class_device {
  47         struct class_device *class_dev;
  48         struct device *dev;
  49         int minor;
  50         struct gendisk *disk;
  51         struct list_head list;
  52 };
  53
  54 extern int bsg_register_disk(struct gendisk *);
  55 extern void bsg_unregister_disk(struct gendisk *);
  56 #else
  57 struct bsg_class_device { };
  58 #define bsg_register_disk(disk)         (0)
  59 #define bsg_unregister_disk(disk)       do { } while (0)
  60 #endif
  61
  62 #endif /* __KERNEL__ */
  63
  64 #endif