include/scsi/sg_request.h

   1 typedef struct scsi_request Scsi_Request;
   2
   3 static Scsi_Request *dummy_cmdp;        /* only used for sizeof */
   4
   5 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
   6         unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
   7         unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
   8         unsigned bufflen;       /* Size of (aggregate) data buffer */
   9         unsigned b_malloc_len;  /* actual len malloc'ed in buffer */
  10         void *buffer;           /* Data buffer or scatter list (k_use_sg>0) */
  11         char dio_in_use;        /* 0->indirect IO (or mmap), 1->dio */
  12         unsigned char cmd_opcode; /* first byte of command */
  13 } Sg_scatter_hold;
  14
  15 typedef struct sg_request {     /* SG_MAX_QUEUE requests outstanding per file */
  16         Scsi_Request *my_cmdp;  /* != 0  when request with lower levels */
  17         struct sg_request *nextrp;      /* NULL -> tail request (slist) */
  18         struct sg_fd *parentfp; /* NULL -> not in use */
  19         Sg_scatter_hold data;   /* hold buffer, perhaps scatter list */
  20         sg_io_hdr_t header;     /* scsi command+info, see <scsi/sg.h> */
  21         unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
  22         char res_used;          /* 1 -> using reserve buffer, 0 -> not ... */
  23         char orphan;            /* 1 -> drop on sight, 0 -> normal */
  24         char sg_io_owned;       /* 1 -> packet belongs to SG_IO */
  25         volatile char done;     /* 0->before bh, 1->before read, 2->read */
  26 } Sg_request;