kernel/blk_drv/scsi/sd.h

/* */
   1 /*
   2  *      sd.h Copyright (C) 1992 Drew Eckhardt 
   3  *      SCSI disk driver header file by
   4  *              Drew Eckhardt 
   5  *
   6  *      <drew@colorado.edu>
   7  */
   8 #ifndef _SD_H
   9         #define _SD_H
  10 /*
  11         $Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/sd.h,v 1.1 1992/07/24 06:27:38 root Exp root $
  12 */
  13 
  14 #ifndef _SCSI_H
  15 #include "scsi.h"
  16 #endif
  17 
  18 #ifndef _GENDISK_H
  19 #include <linux/genhd.h>
  20 #endif
  21 
  22 /*
  23         This is an arbitrary constant, and may be changed to whatever
  24         suits your purposes.  Note that smaller will get you a few bytes
  25         more in kernel space if that is your thing.
  26 */
  27 
  28 #define MAX_SD 4
  29 extern int NR_SD;
  30 
  31 extern struct hd_struct sd[MAX_SD << 4];
  32 
  33 typedef struct {
  34                 unsigned capacity;              /* size in blocks */
  35                 unsigned sector_size;           /* size in bytes */
  36                 Scsi_Device  *device;           
  37                 unsigned char sector_bit_size;  /* sector_size = 2 to the  bit size power */
  38                 unsigned char sector_bit_shift; /* power of 2 sectors per FS block */
  39                 unsigned ten:1;                 /* support ten byte read / write */
  40                 unsigned remap:1;               /* support remapping  */
  41                 } Scsi_Disk;
  42         
  43 extern Scsi_Disk rscsi_disks[MAX_SD];
  44 
  45 void sd_init(void);
  46 
  47 #define HOST (rscsi_disks[DEVICE_NR(CURRENT->dev)].device->host_no)
  48 #define ID (rscsi_disks[DEVICE_NR(CURRENT->dev)].device->id)
  49 #define LUN (rscsi_disks[DEVICE_NR(CURRENT->dev)].device->lun)
  50 #endif
/* */
root/kernel/blk_drv/scsi/sd.h

INCLUDED FROM
