#ifndef _SCSI_DISK_H
  #define _SCSI_DISK_H
  
  /*
   * More than enough for everybody ;)  The huge number of majors
   * is a leftover from 16bit dev_t days, we don't really need that
   * much numberspace.
   */
  #define SD_MAJORS	16
  
  /*
   * Time out in seconds for disks and Magneto-opticals (which are slower).
   */
  #define SD_TIMEOUT		(30 * HZ)
  #define SD_MOD_TIMEOUT		(75 * HZ)
  /*
   * Flush timeout is a multiplier over the standard device timeout which is
   * user modifiable via sysfs but initially set to SD_TIMEOUT
   */
  #define SD_FLUSH_TIMEOUT_MULTIPLIER	2
  #define SD_WRITE_SAME_TIMEOUT	(120 * HZ)
  
  /*
   * Number of allowed retries
   */
  #define SD_MAX_RETRIES		5
  #define SD_PASSTHROUGH_RETRIES	1
  #define SD_MAX_MEDIUM_TIMEOUTS	2
  
  /*
   * Size of the initial data buffer for mode and read capacity data
   */
  #define SD_BUF_SIZE		512
  
  /*
   * Number of sectors at the end of the device to avoid multi-sector
   * accesses to in the case of last_sector_bug
   */
  #define SD_LAST_BUGGY_SECTORS	8
  
  enum {
  	SD_EXT_CDB_SIZE = 32,	/* Extended CDB size */
  	SD_MEMPOOL_SIZE = 2,	/* CDB pool size */
  };
  
  enum {
  	SD_MAX_WS10_BLOCKS = 0xffff,
  	SD_MAX_WS16_BLOCKS = 0x7fffff,
  };
  
  enum {
  	SD_LBP_FULL = 0,	/* Full logical block provisioning */
  	SD_LBP_UNMAP,		/* Use UNMAP command */
  	SD_LBP_WS16,		/* Use WRITE SAME(16) with UNMAP bit */
  	SD_LBP_WS10,		/* Use WRITE SAME(10) with UNMAP bit */
  	SD_LBP_ZERO,		/* Use WRITE SAME(10) with zero payload */
  	SD_LBP_DISABLE,		/* Discard disabled due to failed cmd */
  };
  
  struct scsi_disk {
  	struct scsi_driver *driver;	/* always &sd_template */
  	struct scsi_device *device;
  	struct device	dev;
  	struct gendisk	*disk;
  	atomic_t	openers;
  	sector_t	capacity;	/* size in 512-byte sectors */
  	u32		max_ws_blocks;
  	u32		max_unmap_blocks;
  	u32		unmap_granularity;
  	u32		unmap_alignment;
  	u32		index;
  	unsigned int	physical_block_size;
  	unsigned int	max_medium_access_timeouts;
  	unsigned int	medium_access_timed_out;
  	u8		media_present;
  	u8		write_prot;
  	u8		protection_type;/* Data Integrity Field */
  	u8		provisioning_mode;
  	unsigned	ATO : 1;	/* state of disk ATO bit */
  	unsigned	cache_override : 1; /* temp override of WCE,RCD */
  	unsigned	WCE : 1;	/* state of disk WCE bit */
  	unsigned	RCD : 1;	/* state of disk RCD bit, unused */
  	unsigned	DPOFUA : 1;	/* state of disk DPOFUA bit */
  	unsigned	first_scan : 1;
  	unsigned	lbpme : 1;
  	unsigned	lbprz : 1;
  	unsigned	lbpu : 1;
  	unsigned	lbpws : 1;
  	unsigned	lbpws10 : 1;
  	unsigned	lbpvpd : 1;
  	unsigned	ws10 : 1;
  	unsigned	ws16 : 1;
  };
  #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
  
  static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
  {
  	return container_of(disk->private_data, struct scsi_disk, driver);
  }
  
  #define sd_printk(prefix, sdsk, fmt, a...)				\
          (sdsk)->disk ?							\
  	sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,		\
  		    (sdsk)->disk->disk_name, ##a) :			\
  	sdev_printk(prefix, (sdsk)->device, fmt, ##a)
  
  static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
  {
  	switch (scmd->cmnd[0]) {
  	case READ_6:
  	case READ_10:
  	case READ_12:
  	case READ_16:
  	case SYNCHRONIZE_CACHE:
  	case VERIFY:
  	case VERIFY_12:
  	case VERIFY_16:
  	case WRITE_6:
  	case WRITE_10:
  	case WRITE_12:
  	case WRITE_16:
  	case WRITE_SAME:
  	case WRITE_SAME_16:
  	case UNMAP:
  		return 1;
  	case VARIABLE_LENGTH_CMD:
  		switch (scmd->cmnd[9]) {
  		case READ_32:
  		case VERIFY_32:
  		case WRITE_32:
  		case WRITE_SAME_32:
  			return 1;
  		}
  	}
  
  	return 0;
  }
  
  /*
   * A DIF-capable target device can be formatted with different
   * protection schemes.  Currently 0 through 3 are defined:
   *
   * Type 0 is regular (unprotected) I/O
   *
   * Type 1 defines the contents of the guard and reference tags
   *
   * Type 2 defines the contents of the guard and reference tags and
   * uses 32-byte commands to seed the latter
   *
   * Type 3 defines the contents of the guard tag only
   */
  
  enum sd_dif_target_protection_types {
  	SD_DIF_TYPE0_PROTECTION = 0x0,
  	SD_DIF_TYPE1_PROTECTION = 0x1,
  	SD_DIF_TYPE2_PROTECTION = 0x2,
  	SD_DIF_TYPE3_PROTECTION = 0x3,
  };
  
  /*
   * Data Integrity Field tuple.
   */
  struct sd_dif_tuple {
         __be16 guard_tag;	/* Checksum */
         __be16 app_tag;		/* Opaque storage */
         __be32 ref_tag;		/* Target LBA or indirect LBA */
  };
  
  #ifdef CONFIG_BLK_DEV_INTEGRITY
  
  extern void sd_dif_config_host(struct scsi_disk *);
  extern void sd_dif_prepare(struct request *rq, sector_t, unsigned int);
  extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
  
  #else /* CONFIG_BLK_DEV_INTEGRITY */
  
  static inline void sd_dif_config_host(struct scsi_disk *disk)
  {
  }
  static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
  {
  	return 0;
  }
  static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
  {
  }
  
  #endif /* CONFIG_BLK_DEV_INTEGRITY */
  
  #endif /* _SCSI_DISK_H */