drivers/scsi/sd.h

   1 #ifndef _SCSI_DISK_H
   2 #define _SCSI_DISK_H
   3
   4 /*
   5  * More than enough for everybody ;)  The huge number of majors
   6  * is a leftover from 16bit dev_t days, we don't really need that
   7  * much numberspace.
   8  */
   9 #define SD_MAJORS       16
  10
  11 /*
  12  * This is limited by the naming scheme enforced in sd_probe,
  13  * add another character to it if you really need more disks.
  14  */
  15 #define SD_MAX_DISKS    (((26 * 26) + 26 + 1) * 26)
  16
  17 /*
  18  * Time out in seconds for disks and Magneto-opticals (which are slower).
  19  */
  20 #define SD_TIMEOUT              (30 * HZ)
  21 #define SD_MOD_TIMEOUT          (75 * HZ)
  22
  23 /*
  24  * Number of allowed retries
  25  */
  26 #define SD_MAX_RETRIES          5
  27 #define SD_PASSTHROUGH_RETRIES  1
  28
  29 /*
  30  * Size of the initial data buffer for mode and read capacity data
  31  */
  32 #define SD_BUF_SIZE             512
  33
  34 struct scsi_disk {
  35         struct scsi_driver *driver;     /* always &sd_template */
  36         struct scsi_device *device;
  37         struct device   dev;
  38         struct gendisk  *disk;
  39         unsigned int    openers;        /* protected by BKL for now, yuck */
  40         sector_t        capacity;       /* size in 512-byte sectors */
  41         u32             index;
  42         u8              media_present;
  43         u8              write_prot;
  44         unsigned        previous_state : 1;
  45         unsigned        WCE : 1;        /* state of disk WCE bit */
  46         unsigned        RCD : 1;        /* state of disk RCD bit, unused */
  47         unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
  48 };
  49 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
  50
  51 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
  52 {
  53         return container_of(disk->private_data, struct scsi_disk, driver);
  54 }
  55
  56 #define sd_printk(prefix, sdsk, fmt, a...)                              \
  57         (sdsk)->disk ?                                                  \
  58         sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,                \
  59                     (sdsk)->disk->disk_name, ##a) :                     \
  60         sdev_printk(prefix, (sdsk)->device, fmt, ##a)
  61
  62 #endif /* _SCSI_DISK_H */