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