[PATCH] start moving and splitting the scsi headers

This patch adds the following new files:

  include/scsi/scsi_cmnd.h
  include/scsi/scsi_device.h
  include/scsi/scsi_host.h

for each of the major scsi core data structures and makes the
old scsi.h and hosts.h include them for compatibality.  In the
next round of patches all reamining contents of those will
move to proper locations.

include/scsi/scsi_cmnd.h

+#ifndef _SCSI_SCSI_CMND_H
+#define _SCSI_SCSI_CMND_H
+
+#include <linux/list.h>
+#include <linux/types.h>
+
+struct request;
+struct scatterlist;
+struct scsi_device;
+struct scsi_request;
+
+
+/* embedded in scsi_cmnd */
+struct scsi_pointer {
+	char *ptr;		/* data pointer */
+	int this_residual;	/* left in this buffer */
+	struct scatterlist *buffer;	/* which buffer */
+	int buffers_residual;	/* how many buffers left */
+
+        dma_addr_t dma_handle;
+
+	volatile int Status;
+	volatile int Message;
+	volatile int have_data_in;
+	volatile int sent_command;
+	volatile int phase;
+};
+
+struct scsi_cmnd {
+	int     sc_magic;
+
+	struct scsi_device *device;
+	unsigned short state;
+	unsigned short owner;
+	struct scsi_request *sc_request;
+
+	struct list_head list;  /* scsi_cmnd participates in queue lists */
+
+	struct list_head eh_entry; /* entry for the host eh_cmd_q */
+	int eh_state;		/* Used for state tracking in error handlr */
+	int eh_eflags;		/* Used by error handlr */
+	void (*done) (struct scsi_cmnd *);	/* Mid-level done function */
+
+	/*
+	 * A SCSI Command is assigned a nonzero serial_number when internal_cmnd
+	 * passes it to the driver's queue command function.  The serial_number
+	 * is cleared when scsi_done is entered indicating that the command has
+	 * been completed.  If a timeout occurs, the serial number at the moment
+	 * of timeout is copied into serial_number_at_timeout.  By subsequently
+	 * comparing the serial_number and serial_number_at_timeout fields
+	 * during abort or reset processing, we can detect whether the command
+	 * has already completed.  This also detects cases where the command has
+	 * completed and the SCSI Command structure has already being reused
+	 * for another command, so that we can avoid incorrectly aborting or
+	 * resetting the new command.
+	 */
+	unsigned long serial_number;
+	unsigned long serial_number_at_timeout;
+
+	int retries;
+	int allowed;
+	int timeout_per_command;
+	int timeout_total;
+	int timeout;
+
+	/*
+	 * We handle the timeout differently if it happens when a reset, 
+	 * abort, etc are in process. 
+	 */
+	unsigned volatile char internal_timeout;
+
+	unsigned char cmd_len;
+	unsigned char old_cmd_len;
+	unsigned char sc_data_direction;
+	unsigned char sc_old_data_direction;
+
+	/* These elements define the operation we are about to perform */
+#define MAX_COMMAND_SIZE	16
+	unsigned char cmnd[MAX_COMMAND_SIZE];
+	unsigned request_bufflen;	/* Actual request size */
+
+	struct timer_list eh_timeout;	/* Used to time out the command. */
+	void *request_buffer;		/* Actual requested buffer */
+
+	/* These elements define the operation we ultimately want to perform */
+	unsigned char data_cmnd[MAX_COMMAND_SIZE];
+	unsigned short old_use_sg;	/* We save  use_sg here when requesting
+					 * sense info */
+	unsigned short use_sg;	/* Number of pieces of scatter-gather */
+	unsigned short sglist_len;	/* size of malloc'd scatter-gather list */
+	unsigned short abort_reason;	/* If the mid-level code requests an
+					 * abort, this is the reason. */
+	unsigned bufflen;	/* Size of data buffer */
+	void *buffer;		/* Data buffer */
+
+	unsigned underflow;	/* Return error if less than
+				   this amount is transferred */
+	unsigned old_underflow;	/* save underflow here when reusing the
+				 * command for error handling */
+
+	unsigned transfersize;	/* How much we are guaranteed to
+				   transfer with each SCSI transfer
+				   (ie, between disconnect / 
+				   reconnects.   Probably == sector
+				   size */
+
+	int resid;		/* Number of bytes requested to be
+				   transferred less actual number
+				   transferred (0 if not supported) */
+
+	struct request *request;	/* The command we are
+				   	   working on */
+
+#define SCSI_SENSE_BUFFERSIZE 	64
+	unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE];		/* obtained by REQUEST SENSE
+						 * when CHECK CONDITION is
+						 * received on original command 
+						 * (auto-sense) */
+
+	unsigned flags;
+
+	/* Low-level done function - can be used by low-level driver to point
+	 *        to completion function.  Not used by mid/upper level code. */
+	void (*scsi_done) (struct scsi_cmnd *);
+
+	/*
+	 * The following fields can be written to by the host specific code. 
+	 * Everything else should be left alone. 
+	 */
+	struct scsi_pointer SCp;	/* Scratchpad used by some host adapters */
+
+	unsigned char *host_scribble;	/* The host adapter is allowed to
+					   * call scsi_malloc and get some memory
+					   * and hang it here.     The host adapter
+					   * is also expected to call scsi_free
+					   * to release this memory.  (The memory
+					   * obtained by scsi_malloc is guaranteed
+					   * to be at an address < 16Mb). */
+
+	int result;		/* Status code from lower level driver */
+
+	unsigned char tag;	/* SCSI-II queued command tag */
+	unsigned long pid;	/* Process ID, starts at 0 */
+};
+
+/*
+ * These are the values that scsi_cmd->state can take.
+ */
+#define SCSI_STATE_TIMEOUT         0x1000
+#define SCSI_STATE_FINISHED        0x1001
+#define SCSI_STATE_FAILED          0x1002
+#define SCSI_STATE_QUEUED          0x1003
+#define SCSI_STATE_UNUSED          0x1006
+#define SCSI_STATE_DISCONNECTING   0x1008
+#define SCSI_STATE_INITIALIZING    0x1009
+#define SCSI_STATE_BHQUEUE         0x100a
+#define SCSI_STATE_MLQUEUE         0x100b
+
+
+extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, int);
+extern void scsi_put_command(struct scsi_cmnd *);
+extern void scsi_io_completion(struct scsi_cmnd *, int, int);
+
+#endif /* _SCSI_SCSI_CMND_H */

include/scsi/scsi_device.h

+#ifndef _SCSI_SCSI_DEVICE_H
+#define _SCSI_SCSI_DEVICE_H
+
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+
+struct request_queue;
+struct scsi_cmnd;
+
+
+struct scsi_device {
+	struct class_device	sdev_classdev;
+
+	struct list_head    siblings;   /* list of all devices on this host */
+	struct list_head    same_target_siblings; /* just the devices sharing same target id */
+	struct Scsi_Host *host;
+	struct request_queue *request_queue;
+	volatile unsigned short device_busy;	/* commands actually active on low-level */
+	spinlock_t sdev_lock;           /* also the request queue_lock */
+	spinlock_t list_lock;
+	struct list_head cmd_list;	/* queue of in use SCSI Command structures */
+	struct list_head starved_entry;
+	struct scsi_cmnd *current_cmnd;	/* currently active command */
+	unsigned short queue_depth;	/* How deep of a queue we want */
+	unsigned short last_queue_full_depth; /* These two are used by */
+	unsigned short last_queue_full_count; /* scsi_track_queue_full() */
+	unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
+					   jiffie count on our counter, they
+					   could all be from the same event. */
+
+	unsigned int id, lun, channel;
+
+	unsigned int manufacturer;	/* Manufacturer of device, for using 
+					 * vendor-specific cmd's */
+	unsigned sector_size;	/* size in bytes */
+
+	int access_count;	/* Count of open channels/mounts */
+
+	void *hostdata;		/* available to low-level driver */
+	char devfs_name[256];	/* devfs junk */
+	char type;
+	char scsi_level;
+	unsigned char inquiry_len;	/* valid bytes in 'inquiry' */
+	unsigned char * inquiry;	/* INQUIRY response data */
+	char * vendor;		/* [back_compat] point into 'inquiry' ... */
+	char * model;		/* ... after scan; point to static string */
+	char * rev;		/* ... "nullnullnullnull" before scan */
+	unsigned char current_tag;	/* current tag */
+	struct scsi_target      *sdev_target;   /* used only for single_lun */
+
+	unsigned online:1;
+
+	unsigned writeable:1;
+	unsigned removable:1;
+	unsigned changed:1;	/* Data invalid due to media change */
+	unsigned busy:1;	/* Used to prevent races */
+	unsigned lockable:1;	/* Able to prevent media removal */
+	unsigned locked:1;      /* Media removal disabled */
+	unsigned borken:1;	/* Tell the Seagate driver to be 
+				 * painfully slow on this device */
+	unsigned disconnect:1;	/* can disconnect */
+	unsigned soft_reset:1;	/* Uses soft reset option */
+	unsigned sdtr:1;	/* Device supports SDTR messages */
+	unsigned wdtr:1;	/* Device supports WDTR messages */
+	unsigned ppr:1;		/* Device supports PPR messages */
+	unsigned tagged_supported:1;	/* Supports SCSI-II tagged queuing */
+	unsigned tagged_queue:1;/* This is going away!!!!  Look at simple_tags
+				   instead!!!  Please fix your driver now!! */
+	unsigned simple_tags:1;	/* simple queue tag messages are enabled */
+	unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
+	unsigned single_lun:1;	/* Indicates we should only allow I/O to
+				 * one of the luns for the device at a 
+				 * time. */
+	unsigned was_reset:1;	/* There was a bus reset on the bus for 
+				 * this device */
+	unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
+				     * because we did a bus reset. */
+	unsigned use_10_for_rw:1; /* first try 10-byte read / write */
+	unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
+	unsigned no_start_on_add:1;	/* do not issue start on add */
+
+	unsigned int device_blocked;	/* Device returned QUEUE_FULL. */
+
+	unsigned int max_device_blocked; /* what device_blocked counts down from  */
+#define SCSI_DEFAULT_DEVICE_BLOCKED	3
+
+	struct device sdev_driverfs_dev;
+};
+#define	to_scsi_device(d)	\
+	container_of(d, struct scsi_device, sdev_driverfs_dev)
+
+extern struct scsi_device *scsi_add_device(struct Scsi_Host *,
+		uint, uint, uint);
+extern int scsi_remove_device(struct scsi_device *);
+extern void scsi_set_device_offline(struct scsi_device *);
+
+extern int scsi_device_get(struct scsi_device *);
+extern void scsi_device_put(struct scsi_device *);
+
+extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
+extern int scsi_track_queue_full(struct scsi_device *, int);
+
+extern int scsi_set_medium_removal(struct scsi_device *, char);
+
+#endif /* _SCSI_SCSI_DEVICE_H */