72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
|
|
||
|
|
/*
|
||
|
|
* sbull.h -- definitions for the char module
|
||
|
|
*
|
||
|
|
* Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet
|
||
|
|
* Copyright (C) 2001 O'Reilly & Associates
|
||
|
|
*
|
||
|
|
* The source code in this file can be freely used, adapted,
|
||
|
|
* and redistributed in source or binary form, so long as an
|
||
|
|
* acknowledgment appears in derived source files. The citation
|
||
|
|
* should list that the code comes from the book "Linux Device
|
||
|
|
* Drivers" by Alessandro Rubini and Jonathan Corbet, published
|
||
|
|
* by O'Reilly & Associates. No warranty is attached;
|
||
|
|
* we cannot take responsibility for errors or fitness for use.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#include <linux/ioctl.h>
|
||
|
|
|
||
|
|
/* Multiqueue only works on 2.4 */
|
||
|
|
#ifdef SBULL_MULTIQUEUE
|
||
|
|
# warning "Multiqueue only works on 2.4 kernels"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Macros to help debugging
|
||
|
|
*/
|
||
|
|
|
||
|
|
#undef PDEBUG /* undef it, just in case */
|
||
|
|
#ifdef SBULL_DEBUG
|
||
|
|
# ifdef __KERNEL__
|
||
|
|
/* This one if debugging is on, and kernel space */
|
||
|
|
# define PDEBUG(fmt, args...) printk( KERN_DEBUG "sbull: " fmt, ## args)
|
||
|
|
# else
|
||
|
|
/* This one for user space */
|
||
|
|
# define PDEBUG(fmt, args...) fprintf(stderr, fmt, ## args)
|
||
|
|
# endif
|
||
|
|
#else
|
||
|
|
# define PDEBUG(fmt, args...) /* not debugging: nothing */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#undef PDEBUGG
|
||
|
|
#define PDEBUGG(fmt, args...) /* nothing: it's a placeholder */
|
||
|
|
|
||
|
|
|
||
|
|
#define SBULL_MAJOR 0 /* dynamic major by default */
|
||
|
|
#define SBULL_DEVS 2 /* two disks */
|
||
|
|
#define SBULL_RAHEAD 2 /* two sectors */
|
||
|
|
#define SBULL_SIZE 2048 /* two megs each */
|
||
|
|
#define SBULL_BLKSIZE 1024 /* 1k blocks */
|
||
|
|
#define SBULL_HARDSECT 512 /* 2.2 and 2.4 can used different values */
|
||
|
|
|
||
|
|
#define SBULLR_MAJOR 0 /* Dynamic major for raw device */
|
||
|
|
/*
|
||
|
|
* The sbull device is removable: if it is left closed for more than
|
||
|
|
* half a minute, it is removed. Thus use a usage count and a
|
||
|
|
* kernel timer
|
||
|
|
*/
|
||
|
|
|
||
|
|
typedef struct Sbull_Dev {
|
||
|
|
int size;
|
||
|
|
int usage;
|
||
|
|
struct timer_list timer;
|
||
|
|
spinlock_t lock;
|
||
|
|
u8 *data;
|
||
|
|
#ifdef SBULL_MULTIQUEUE
|
||
|
|
request_queue_t *queue;
|
||
|
|
int busy;
|
||
|
|
#endif
|
||
|
|
} Sbull_Dev;
|