include/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 class_device cdev;
  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        WCE : 1;        /* state of disk WCE bit */
  45         unsigned        RCD : 1;        /* state of disk RCD bit, unused */
  46         unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
  47 };
  48 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,cdev)
  49
  50 static int  sd_revalidate_disk(struct gendisk *disk);
  51 static void sd_rw_intr(struct scsi_cmnd * SCpnt);
  52 static int  sd_probe(struct device *);
  53 static int  sd_remove(struct device *);
  54 static void sd_shutdown(struct device *dev);
  55 static int sd_suspend(struct device *dev, pm_message_t state);
  56 static int sd_resume(struct device *dev);
  57 static void sd_rescan(struct device *);
  58 static int  sd_init_command(struct scsi_cmnd *);
  59 static int  sd_issue_flush(struct device *, sector_t *);
  60 static void sd_prepare_flush(request_queue_t *, struct request *);
  61 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
  62 static void scsi_disk_release(struct class_device *cdev);
  63 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
  64 static void sd_print_result(struct scsi_disk *, int);
  65
  66 #define sd_printk(prefix, sdsk, fmt, a...)                              \
  67         (sdsk)->disk ?                                                  \
  68         sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,                \
  69                     (sdsk)->disk->disk_name, ##a) :                     \
  70         sdev_printk(prefix, (sdsk)->device, fmt, ##a)
  71
  72 #endif /* _SCSI_DISK_H */