text: /*
   * File...........: linux/drivers/s390/block/dasd_int.h
   * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   *		    Horst Hummel <Horst.Hummel@de.ibm.com>
   *		    Martin Schwidefsky <schwidefsky@de.ibm.com>
   * Bugreports.to..: <Linux390@de.ibm.com>
   * Copyright IBM Corp. 1999, 2009
   */
  
  #ifndef DASD_INT_H
  #define DASD_INT_H
  
  #ifdef __KERNEL__
  
  /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
  #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
  #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
  
  /*
   * States a dasd device can have:
   *   new: the dasd_device structure is allocated.
   *   known: the discipline for the device is identified.
   *   basic: the device can do basic i/o.
   *   unfmt: the device could not be analyzed (format is unknown).
   *   ready: partition detection is done and the device is can do block io.
   *   online: the device accepts requests from the block device queue.
   *
   * Things to do for startup state transitions:
   *   new -> known: find discipline for the device and create devfs entries.
   *   known -> basic: request irq line for the device.
   *   basic -> ready: do the initial analysis, e.g. format detection,
   *                   do block device setup and detect partitions.
   *   ready -> online: schedule the device tasklet.
   * Things to do for shutdown state transitions:
   *   online -> ready: just set the new device state.
   *   ready -> basic: flush requests from the block device layer, clear
   *                   partition information and reset format information.
   *   basic -> known: terminate all requests and free irq.
   *   known -> new: remove devfs entries and forget discipline.
   */
  
  #define DASD_STATE_NEW	  0
  #define DASD_STATE_KNOWN  1
  #define DASD_STATE_BASIC  2
  #define DASD_STATE_UNFMT  3
  #define DASD_STATE_READY  4
  #define DASD_STATE_ONLINE 5
  
  #include <linux/module.h>
  #include <linux/wait.h>
  #include <linux/blkdev.h>
  #include <linux/genhd.h>
  #include <linux/hdreg.h>
  #include <linux/interrupt.h>
  #include <linux/log2.h>
  #include <asm/ccwdev.h>
  #include <linux/workqueue.h>
  #include <asm/debug.h>
  #include <asm/dasd.h>
  #include <asm/idals.h>
  
  /* DASD discipline magic */
  #define DASD_ECKD_MAGIC 0xC5C3D2C4
  #define DASD_DIAG_MAGIC 0xC4C9C1C7
  #define DASD_FBA_MAGIC 0xC6C2C140
  
  /*
   * SECTION: Type definitions
   */
  struct dasd_device;
  struct dasd_block;
  
  /* BIT DEFINITIONS FOR SENSE DATA */
  #define DASD_SENSE_BIT_0 0x80
  #define DASD_SENSE_BIT_1 0x40
  #define DASD_SENSE_BIT_2 0x20
  #define DASD_SENSE_BIT_3 0x10
  
  /* BIT DEFINITIONS FOR SIM SENSE */
  #define DASD_SIM_SENSE 0x0F
  #define DASD_SIM_MSG_TO_OP 0x03
  #define DASD_SIM_LOG 0x0C
  
  /* lock class for nested cdev lock */
  #define CDEV_NESTED_FIRST 1
  #define CDEV_NESTED_SECOND 2
  
  /*
   * SECTION: MACROs for klogd and s390 debug feature (dbf)
   */
  #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
  do { \
  	debug_sprintf_event(d_device->debug_area, \
  			    d_level, \
  			    d_str "\n", \
  			    d_data); \
  } while(0)
  
  #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
  do { \
  	debug_sprintf_exception(d_device->debug_area, \
  				d_level, \
  				d_str "\n", \
  				d_data); \
  } while(0)
  
  #define DBF_EVENT(d_level, d_str, d_data...)\
  do { \
  	debug_sprintf_event(dasd_debug_area, \
  			    d_level,\
  			    d_str "\n", \
  			    d_data); \
  } while(0)
  
  #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...)	\
  do { \
  	struct ccw_dev_id __dev_id;			\
  	ccw_device_get_id(d_cdev, &__dev_id);		\
  	debug_sprintf_event(dasd_debug_area,		\
  			    d_level,					\
  			    "0.%x.%04x " d_str "\n",			\
  			    __dev_id.ssid, __dev_id.devno, d_data);	\
  } while (0)
  
  #define DBF_EXC(d_level, d_str, d_data...)\
  do { \
  	debug_sprintf_exception(dasd_debug_area, \
  				d_level,\
  				d_str "\n", \
  				d_data); \
  } while(0)
  
  /* limit size for an errorstring */
  #define ERRORLENGTH 30
  
  /* definition of dbf debug levels */
  #define	DBF_EMERG	0	/* system is unusable			*/
  #define	DBF_ALERT	1	/* action must be taken immediately	*/
  #define	DBF_CRIT	2	/* critical conditions			*/
  #define	DBF_ERR		3	/* error conditions			*/
  #define	DBF_WARNING	4	/* warning conditions			*/
  #define	DBF_NOTICE	5	/* normal but significant condition	*/
  #define	DBF_INFO	6	/* informational			*/
  #define	DBF_DEBUG	6	/* debug-level messages			*/
  
  /* messages to be written via klogd and dbf */
  #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
  do { \
  	printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
  	       dev_name(&d_device->cdev->dev), d_args); \
  	DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
  } while(0)
  
  #define MESSAGE(d_loglevel,d_string,d_args...)\
  do { \
  	printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
  	DBF_EVENT(DBF_ALERT, d_string, d_args); \
  } while(0)
  
  /* messages to be written via klogd only */
  #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
  do { \
  	printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
  	       dev_name(&d_device->cdev->dev), d_args); \
  } while(0)
  
  #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
  do { \
  	printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
  } while(0)
  
  struct dasd_ccw_req {
  	unsigned int magic;		/* Eye catcher */
  	struct list_head devlist;	/* for dasd_device request queue */
  	struct list_head blocklist;	/* for dasd_block request queue */
  
  	/* Where to execute what... */
  	struct dasd_block *block;	/* the originating block device */
  	struct dasd_device *memdev;	/* the device used to allocate this */
  	struct dasd_device *startdev;	/* device the request is started on */
  	void *cpaddr;			/* address of ccw or tcw */
  	unsigned char cpmode;		/* 0 = cmd mode, 1 = itcw */
  	char status;			/* status of this request */
  	short retries;			/* A retry counter */
  	unsigned long flags;        	/* flags of this request */
  
  	/* ... and how */
  	unsigned long starttime;	/* jiffies time of request start */
  	unsigned long expires;		/* expiration period in jiffies */
  	char lpm;			/* logical path mask */
  	void *data;			/* pointer to data area */
  
  	/* these are important for recovering erroneous requests          */
  	int intrc;			/* internal error, e.g. from start_IO */
  	struct irb irb;			/* device status in case of an error */
  	struct dasd_ccw_req *refers;	/* ERP-chain queueing. */
  	void *function; 		/* originating ERP action */
  
  	/* these are for statistics only */
  	unsigned long long buildclk;	/* TOD-clock of request generation */
  	unsigned long long startclk;	/* TOD-clock of request start */
  	unsigned long long stopclk;	/* TOD-clock of request interrupt */
  	unsigned long long endclk;	/* TOD-clock of request termination */
  
          /* Callback that is called after reaching final status. */
  	void (*callback)(struct dasd_ccw_req *, void *data);
  	void *callback_data;
  };
  
  /*
   * dasd_ccw_req -> status can be:
   */
  #define DASD_CQR_FILLED 	0x00	/* request is ready to be processed */
  #define DASD_CQR_DONE		0x01	/* request is completed successfully */
  #define DASD_CQR_NEED_ERP	0x02	/* request needs recovery action */
  #define DASD_CQR_IN_ERP 	0x03	/* request is in recovery */
  #define DASD_CQR_FAILED 	0x04	/* request is finally failed */
  #define DASD_CQR_TERMINATED	0x05	/* request was stopped by driver */
  
  #define DASD_CQR_QUEUED 	0x80	/* request is queued to be processed */
  #define DASD_CQR_IN_IO		0x81	/* request is currently in IO */
  #define DASD_CQR_ERROR		0x82	/* request is completed with error */
  #define DASD_CQR_CLEAR_PENDING	0x83	/* request is clear pending */
  #define DASD_CQR_CLEARED	0x84	/* request was cleared */
  #define DASD_CQR_SUCCESS	0x85	/* request was successful */
  
  /* default expiration time*/
  #define DASD_EXPIRES	  300
  #define DASD_EXPIRES_MAX  40000000
  
  /* per dasd_ccw_req flags */
  #define DASD_CQR_FLAGS_USE_ERP   0	/* use ERP for this request */
  #define DASD_CQR_FLAGS_FAILFAST  1	/* FAILFAST */
  #define DASD_CQR_VERIFY_PATH	 2	/* path verification request */
  #define DASD_CQR_ALLOW_SLOCK	 3	/* Try this request even when lock was
  					 * stolen. Should not be combined with
  					 * DASD_CQR_FLAGS_USE_ERP
  					 */
  
  /* Signature for error recovery functions. */
  typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
  
  /*
   * Unique identifier for dasd device.
   */
  #define UA_NOT_CONFIGURED  0x00
  #define UA_BASE_DEVICE	   0x01
  #define UA_BASE_PAV_ALIAS  0x02
  #define UA_HYPER_PAV_ALIAS 0x03
  
  struct dasd_uid {
  	__u8 type;
  	char vendor[4];
  	char serial[15];
  	__u16 ssid;
  	__u8 real_unit_addr;
  	__u8 base_unit_addr;
  	char vduit[33];
  };
  
  /*
   * the struct dasd_discipline is
   * sth like a table of virtual functions, if you think of dasd_eckd
   * inheriting dasd...
   * no, currently we are not planning to reimplement the driver in C++
   */
  struct dasd_discipline {
  	struct module *owner;
  	char ebcname[8];	/* a name used for tagging and printks */
  	char name[8];		/* a name used for tagging and printks */
  	int max_blocks;		/* maximum number of blocks to be chained */
  
  	struct list_head list;	/* used for list of disciplines */
  
  	/*
  	 * Device recognition functions. check_device is used to verify
  	 * the sense data and the information returned by read device
  	 * characteristics. It returns 0 if the discipline can be used
  	 * for the device in question. uncheck_device is called during
  	 * device shutdown to deregister a device from its discipline.
  	 */
  	int (*check_device) (struct dasd_device *);
  	void (*uncheck_device) (struct dasd_device *);
  
  	/*
  	 * do_analysis is used in the step from device state "basic" to
  	 * state "accept". It returns 0 if the device can be made ready,
  	 * it returns -EMEDIUMTYPE if the device can't be made ready or
  	 * -EAGAIN if do_analysis started a ccw that needs to complete
  	 * before the analysis may be repeated.
  	 */
  	int (*do_analysis) (struct dasd_block *);
  
  	/*
  	 * This function is called, when new paths become available.
  	 * Disciplins may use this callback to do necessary setup work,
  	 * e.g. verify that new path is compatible with the current
  	 * configuration.
  	 */
  	int (*verify_path)(struct dasd_device *, __u8);
  
  	/*
  	 * Last things to do when a device is set online, and first things
  	 * when it is set offline.
  	 */
  	int (*ready_to_online) (struct dasd_device *);
  	int (*online_to_ready) (struct dasd_device *);
  
  	/*
  	 * Device operation functions. build_cp creates a ccw chain for
  	 * a block device request, start_io starts the request and
  	 * term_IO cancels it (e.g. in case of a timeout). format_device
  	 * returns a ccw chain to be used to format the device.
  	 * handle_terminated_request allows to examine a cqr and prepare
  	 * it for retry.
  	 */
  	struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
  					  struct dasd_block *,
  					  struct request *);
  	int (*start_IO) (struct dasd_ccw_req *);
  	int (*term_IO) (struct dasd_ccw_req *);
  	void (*handle_terminated_request) (struct dasd_ccw_req *);
  	struct dasd_ccw_req *(*format_device) (struct dasd_device *,
  					       struct format_data_t *);
  	int (*free_cp) (struct dasd_ccw_req *, struct request *);
  
  	/*
  	 * Error recovery functions. examine_error() returns a value that
  	 * indicates what to do for an error condition. If examine_error()
  	 * returns 'dasd_era_recover' erp_action() is called to create a
  	 * special error recovery ccw. erp_postaction() is called after
  	 * an error recovery ccw has finished its execution. dump_sense
  	 * is called for every error condition to print the sense data
  	 * to the console.
  	 */
  	dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
  	dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
  	void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
  			    struct irb *);
  	void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
  	void (*check_for_device_change) (struct dasd_device *,
  					 struct dasd_ccw_req *,
  					 struct irb *);
  
          /* i/o control functions. */
  	int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
  	int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
  	int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
  
  	/* suspend/resume functions */
  	int (*freeze) (struct dasd_device *);
  	int (*restore) (struct dasd_device *);
  
  	/* reload device after state change */
  	int (*reload) (struct dasd_device *);
  
  	int (*get_uid) (struct dasd_device *, struct dasd_uid *);
  };
  
  extern struct dasd_discipline *dasd_diag_discipline_pointer;
  
  /*
   * Notification numbers for extended error reporting notifications:
   * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
   * eer pointer) is freed. The error reporting module needs to do all necessary
   * cleanup steps.
   * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
   */
  #define DASD_EER_DISABLE 0
  #define DASD_EER_TRIGGER 1
  
  /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
  #define DASD_EER_FATALERROR  1
  #define DASD_EER_NOPATH      2
  #define DASD_EER_STATECHANGE 3
  #define DASD_EER_PPRCSUSPEND 4
  
  struct dasd_path {
  	__u8 opm;
  	__u8 tbvpm;
  	__u8 ppm;
  	__u8 npm;
  };
  
  struct dasd_device {
  	/* Block device stuff. */
  	struct dasd_block *block;
  
          unsigned int devindex;
  	unsigned long flags;	   /* per device flags */
  	unsigned short features;   /* copy of devmap-features (read-only!) */
  
  	/* extended error reporting stuff (eer) */
  	struct dasd_ccw_req *eer_cqr;
  
  	/* Device discipline stuff. */
  	struct dasd_discipline *discipline;
  	struct dasd_discipline *base_discipline;
  	char *private;
  	struct dasd_path path_data;
  
  	/* Device state and target state. */
  	int state, target;
  	struct mutex state_mutex;
  	int stopped;		/* device (ccw_device_start) was stopped */
  
  	/* reference count. */
          atomic_t ref_count;
  
  	/* ccw queue and memory for static ccw/erp buffers. */
  	struct list_head ccw_queue;
  	spinlock_t mem_lock;
  	void *ccw_mem;
  	void *erp_mem;
  	struct list_head ccw_chunks;
  	struct list_head erp_chunks;
  
  	atomic_t tasklet_scheduled;
          struct tasklet_struct tasklet;
  	struct work_struct kick_work;
  	struct work_struct restore_device;
  	struct work_struct reload_device;
  	struct timer_list timer;
  
  	debug_info_t *debug_area;
  
  	struct ccw_device *cdev;
  
  	/* hook for alias management */
  	struct list_head alias_list;
  
  	/* default expiration time in s */
  	unsigned long default_expires;
  };
  
  struct dasd_block {
  	/* Block device stuff. */
  	struct gendisk *gdp;
  	struct request_queue *request_queue;
  	spinlock_t request_queue_lock;
  	struct block_device *bdev;
  	atomic_t open_count;
  
  	unsigned long long blocks; /* size of volume in blocks */
  	unsigned int bp_block;	   /* bytes per block */
  	unsigned int s2b_shift;	   /* log2 (bp_block/512) */
  
  	struct dasd_device *base;
  	struct list_head ccw_queue;
  	spinlock_t queue_lock;
  
  	atomic_t tasklet_scheduled;
  	struct tasklet_struct tasklet;
  	struct timer_list timer;
  
  #ifdef CONFIG_DASD_PROFILE
  	struct dasd_profile_info_t profile;
  #endif
  };
  
  
  
  /* reasons why device (ccw_device_start) was stopped */
  #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
  #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
  #define DASD_STOPPED_PENDING 4         /* long busy */
  #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
  #define DASD_STOPPED_SU      16        /* summary unit check handling */
  #define DASD_STOPPED_PM      32        /* pm state transition */
  #define DASD_UNRESUMED_PM    64        /* pm resume failed state */
  
  /* per device flags */
  #define DASD_FLAG_OFFLINE	3	/* device is in offline processing */
  #define DASD_FLAG_EER_SNSS	4	/* A SNSS is required */
  #define DASD_FLAG_EER_IN_USE	5	/* A SNSS request is running */
  #define DASD_FLAG_DEVICE_RO	6	/* The device itself is read-only. Don't
  					 * confuse this with the user specified
  					 * read-only feature.
  					 */
  #define DASD_FLAG_IS_RESERVED	7	/* The device is reserved */
  #define DASD_FLAG_LOCK_STOLEN	8	/* The device lock was stolen */
  
  
  void dasd_put_device_wake(struct dasd_device *);
  
  /*
   * Reference count inliners
   */
  static inline void
  dasd_get_device(struct dasd_device *device)
  {
  	atomic_inc(&device->ref_count);
  }
  
  static inline void
  dasd_put_device(struct dasd_device *device)
  {
  	if (atomic_dec_return(&device->ref_count) == 0)
  		dasd_put_device_wake(device);
  }
  
  /*
   * The static memory in ccw_mem and erp_mem is managed by a sorted
   * list of free memory chunks.
   */
  struct dasd_mchunk
  {
  	struct list_head list;
  	unsigned long size;
  } __attribute__ ((aligned(8)));
  
  static inline void
  dasd_init_chunklist(struct list_head *chunk_list, void *mem,
  		    unsigned long size)
  {
  	struct dasd_mchunk *chunk;
  
  	INIT_LIST_HEAD(chunk_list);
  	chunk = (struct dasd_mchunk *) mem;
  	chunk->size = size - sizeof(struct dasd_mchunk);
  	list_add(&chunk->list, chunk_list);
  }
  
  static inline void *
  dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
  {
  	struct dasd_mchunk *chunk, *tmp;
  
  	size = (size + 7L) & -8L;
  	list_for_each_entry(chunk, chunk_list, list) {
  		if (chunk->size < size)
  			continue;
  		if (chunk->size > size + sizeof(struct dasd_mchunk)) {
  			char *endaddr = (char *) (chunk + 1) + chunk->size;
  			tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
  			tmp->size = size;
  			chunk->size -= size + sizeof(struct dasd_mchunk);
  			chunk = tmp;
  		} else
  			list_del(&chunk->list);
  		return (void *) (chunk + 1);
  	}
  	return NULL;
  }
  
  static inline void
  dasd_free_chunk(struct list_head *chunk_list, void *mem)
  {
  	struct dasd_mchunk *chunk, *tmp;
  	struct list_head *p, *left;
  
  	chunk = (struct dasd_mchunk *)
  		((char *) mem - sizeof(struct dasd_mchunk));
  	/* Find out the left neighbour in chunk_list. */
  	left = chunk_list;
  	list_for_each(p, chunk_list) {
  		if (list_entry(p, struct dasd_mchunk, list) > chunk)
  			break;
  		left = p;
  	}
  	/* Try to merge with right neighbour = next element from left. */
  	if (left->next != chunk_list) {
  		tmp = list_entry(left->next, struct dasd_mchunk, list);
  		if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
  			list_del(&tmp->list);
  			chunk->size += tmp->size + sizeof(struct dasd_mchunk);
  		}
  	}
  	/* Try to merge with left neighbour. */
  	if (left != chunk_list) {
  		tmp = list_entry(left, struct dasd_mchunk, list);
  		if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
  			tmp->size += chunk->size + sizeof(struct dasd_mchunk);
  			return;
  		}
  	}
  	__list_add(&chunk->list, left, left->next);
  }
  
  /*
   * Check if bsize is in { 512, 1024, 2048, 4096 }
   */
  static inline int
  dasd_check_blocksize(int bsize)
  {
  	if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
  		return -EMEDIUMTYPE;
  	return 0;
  }
  
  /* externals in dasd.c */
  #define DASD_PROFILE_ON	 1
  #define DASD_PROFILE_OFF 0
  
  extern debug_info_t *dasd_debug_area;
  extern struct dasd_profile_info_t dasd_global_profile;
  extern unsigned int dasd_profile_level;
  extern const struct block_device_operations dasd_device_operations;
  
  extern struct kmem_cache *dasd_page_cache;
  
  struct dasd_ccw_req *
  dasd_kmalloc_request(int , int, int, struct dasd_device *);
  struct dasd_ccw_req *
  dasd_smalloc_request(int , int, int, struct dasd_device *);
  void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
  void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
  
  static inline int
  dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
  {
  	return set_normalized_cda(ccw, cda);
  }
  
  struct dasd_device *dasd_alloc_device(void);
  void dasd_free_device(struct dasd_device *);
  
  struct dasd_block *dasd_alloc_block(void);
  void dasd_free_block(struct dasd_block *);
  
  void dasd_enable_device(struct dasd_device *);
  void dasd_set_target_state(struct dasd_device *, int);
  void dasd_kick_device(struct dasd_device *);
  void dasd_restore_device(struct dasd_device *);
  void dasd_reload_device(struct dasd_device *);
  
  void dasd_add_request_head(struct dasd_ccw_req *);
  void dasd_add_request_tail(struct dasd_ccw_req *);
  int  dasd_start_IO(struct dasd_ccw_req *);
  int  dasd_term_IO(struct dasd_ccw_req *);
  void dasd_schedule_device_bh(struct dasd_device *);
  void dasd_schedule_block_bh(struct dasd_block *);
  int  dasd_sleep_on(struct dasd_ccw_req *);
  int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
  int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
  void dasd_device_set_timer(struct dasd_device *, int);
  void dasd_device_clear_timer(struct dasd_device *);
  void dasd_block_set_timer(struct dasd_block *, int);
  void dasd_block_clear_timer(struct dasd_block *);
  int  dasd_cancel_req(struct dasd_ccw_req *);
  int dasd_flush_device_queue(struct dasd_device *);
  int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
  void dasd_generic_remove (struct ccw_device *cdev);
  int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
  int dasd_generic_set_offline (struct ccw_device *cdev);
  int dasd_generic_notify(struct ccw_device *, int);
  int dasd_generic_last_path_gone(struct dasd_device *);
  int dasd_generic_path_operational(struct dasd_device *);
  
  void dasd_generic_handle_state_change(struct dasd_device *);
  int dasd_generic_pm_freeze(struct ccw_device *);
  int dasd_generic_restore_device(struct ccw_device *);
  enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
  void dasd_generic_path_event(struct ccw_device *, int *);
  int dasd_generic_verify_path(struct dasd_device *, __u8);
  
  int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
  char *dasd_get_sense(struct irb *);
  
  void dasd_device_set_stop_bits(struct dasd_device *, int);
  void dasd_device_remove_stop_bits(struct dasd_device *, int);
  
  int dasd_device_is_ro(struct dasd_device *);
  
  
  /* externals in dasd_devmap.c */
  extern int dasd_max_devindex;
  extern int dasd_probeonly;
  extern int dasd_autodetect;
  extern int dasd_nopav;
  extern int dasd_nofcx;
  
  int dasd_devmap_init(void);
  void dasd_devmap_exit(void);
  
  struct dasd_device *dasd_create_device(struct ccw_device *);
  void dasd_delete_device(struct dasd_device *);
  
  int dasd_get_feature(struct ccw_device *, int);
  int dasd_set_feature(struct ccw_device *, int, int);
  
  int dasd_add_sysfs_files(struct ccw_device *);
  void dasd_remove_sysfs_files(struct ccw_device *);
  
  struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
  struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
  struct dasd_device *dasd_device_from_devindex(int);
  
  void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
  struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
  
  int dasd_parse(void);
  int dasd_busid_known(const char *);
  
  /* externals in dasd_gendisk.c */
  int  dasd_gendisk_init(void);
  void dasd_gendisk_exit(void);
  int dasd_gendisk_alloc(struct dasd_block *);
  void dasd_gendisk_free(struct dasd_block *);
  int dasd_scan_partitions(struct dasd_block *);
  void dasd_destroy_partitions(struct dasd_block *);
  
  /* externals in dasd_ioctl.c */
  int  dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
  
  /* externals in dasd_proc.c */
  int dasd_proc_init(void);
  void dasd_proc_exit(void);
  
  /* externals in dasd_erp.c */
  struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
  struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
  struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
  					    struct dasd_device *);
  void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
  void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
  void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
  
  /* externals in dasd_3990_erp.c */
  struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
  void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
  
  /* externals in dasd_eer.c */
  #ifdef CONFIG_DASD_EER
  int dasd_eer_init(void);
  void dasd_eer_exit(void);
  int dasd_eer_enable(struct dasd_device *);
  void dasd_eer_disable(struct dasd_device *);
  void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
  		    unsigned int id);
  void dasd_eer_snss(struct dasd_device *);
  
  static inline int dasd_eer_enabled(struct dasd_device *device)
  {
  	return device->eer_cqr != NULL;
  }
  #else
  #define dasd_eer_init()		(0)
  #define dasd_eer_exit()		do { } while (0)
  #define dasd_eer_enable(d)	(0)
  #define dasd_eer_disable(d)	do { } while (0)
  #define dasd_eer_write(d,c,i)	do { } while (0)
  #define dasd_eer_snss(d)	do { } while (0)
  #define dasd_eer_enabled(d)	(0)
  #endif	/* CONFIG_DASD_ERR */
  
  #endif				/* __KERNEL__ */
  
  #endif				/* DASD_H */
  