LXR linux-bk/include/scsi/scsi

   1#ifndef _SCSI_SCSI_REQUEST_H
   2#define _SCSI_SCSI_REQUEST_H
   3
   4#include <scsi/scsi_cmnd.h>
   5
   6struct request;
   7struct scsi_cmnd;
   8struct scsi_device;
   9struct Scsi_Host;
  10
  11
  12/*
  13 * This is essentially a slimmed down version of Scsi_Cmnd.  The point of
  14 * having this is that requests that are injected into the queue as result
  15 * of things like ioctls and character devices shouldn't be using a
  16 * Scsi_Cmnd until such a time that the command is actually at the head
  17 * of the queue and being sent to the driver.
  18 */
  19struct scsi_request {
  20        int     sr_magic;
  21        int     sr_result;      /* Status code from lower level driver */
  22        unsigned char sr_sense_buffer[SCSI_SENSE_BUFFERSIZE];           /* obtained by REQUEST SENSE
  23                                                 * when CHECK CONDITION is
  24                                                 * received on original command 
  25                                                 * (auto-sense) */
  26
  27        struct Scsi_Host *sr_host;
  28        struct scsi_device *sr_device;
  29        struct scsi_cmnd *sr_command;
  30        struct request *sr_request;     /* A copy of the command we are
  31                                   working on */
  32        unsigned sr_bufflen;    /* Size of data buffer */
  33        void *sr_buffer;                /* Data buffer */
  34        int sr_allowed;
  35        enum dma_data_direction sr_data_direction;
  36        unsigned char sr_cmd_len;
  37        unsigned char sr_cmnd[MAX_COMMAND_SIZE];
  38        void (*sr_done) (struct scsi_cmnd *);   /* Mid-level done function */
  39        int sr_timeout_per_command;
  40        unsigned short sr_use_sg;       /* Number of pieces of scatter-gather */
  41        unsigned short sr_sglist_len;   /* size of malloc'd scatter-gather list */
  42        unsigned sr_underflow;  /* Return error if less than
  43                                   this amount is transferred */
  44        void *upper_private_data;       /* reserved for owner (usually upper
  45                                           level driver) of this request */
  46};
  47
  48extern struct scsi_request *scsi_allocate_request(struct scsi_device *, int);
  49extern void scsi_release_request(struct scsi_request *);
  50extern void scsi_wait_req(struct scsi_request *, const void *cmnd,
  51                          void *buffer, unsigned bufflen,
  52                          int timeout, int retries);
  53extern void scsi_do_req(struct scsi_request *, const void *cmnd,
  54                        void *buffer, unsigned bufflen,
  55                        void (*done) (struct scsi_cmnd *),
  56                        int timeout, int retries);
  57
  58struct scsi_mode_data {
  59        __u32   length;
  60        __u16   block_descriptor_length;
  61        __u8    medium_type;
  62        __u8    device_specific;
  63        __u8    header_length;
  64        __u8    longlba:1;
  65};
  66
  67extern int __scsi_mode_sense(struct scsi_request *SRpnt, int dbd,
  68                             int modepage, unsigned char *buffer, int len,
  69                             int timeout, int retries,
  70                             struct scsi_mode_data *data);
  71
  72
  73#endif /* _SCSI_SCSI_REQUEST_H */
  74