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#ifndef _BLK_H
#define _BLK_H
#include <linux/blkdev.h>
#include <linux/elevator.h>
#include <linux/locks.h>
#include <linux/config.h>
#include <linux/spinlock.h>
#include <linux/compiler.h>
extern void set_device_ro(kdev_t dev,int flag);
extern void add_blkdev_randomness(int major);
#ifdef CONFIG_BLK_DEV_RAM
extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
extern int rd_image_start; /* starting block # of image */
#ifdef CONFIG_BLK_DEV_INITRD
#define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
extern unsigned long initrd_start,initrd_end;
extern int initrd_below_start_ok; /* 1 if it is not an error if initrd_start < memory_start */
void initrd_init(void);
#endif /* CONFIG_BLK_DEV_INITRD */
#endif
/*
* end_request() and friends. Must be called with the request queue spinlock
* acquired. All functions called within end_request() _must_be_ atomic.
*
* Several drivers define their own end_request and call
* end_that_request_first() and end_that_request_last()
* for parts of the original function. This prevents
* code duplication in drivers.
*/
extern int end_that_request_first(struct request *, int, int);
extern void end_that_request_last(struct request *);
static inline void blkdev_dequeue_request(struct request *req)
{
list_del(&req->queuelist);
if (req->q)
elv_remove_request(req->q, req);
}
extern inline struct request *elv_next_request(request_queue_t *q)
{
struct request *rq;
while ((rq = __elv_next_request(q))) {
rq->flags |= REQ_STARTED;
if (&rq->queuelist == q->last_merge)
q->last_merge = NULL;
if ((rq->flags & REQ_DONTPREP) || !q->prep_rq_fn)
break;
/*
* all ok, break and return it
*/
if (!q->prep_rq_fn(q, rq))
break;
/*
* prep said no-go, kill it
*/
blkdev_dequeue_request(rq);
if (end_that_request_first(rq, 0, rq->nr_sectors))
BUG();
end_that_request_last(rq);
}
return rq;
}
#define _elv_add_request_core(q, rq, where, plug) \
do { \
if ((plug)) \
blk_plug_device((q)); \
(q)->elevator.elevator_add_req_fn((q), (rq), (where)); \
} while (0)
#define _elv_add_request(q, rq, back, p) do { \
if ((back)) \
_elv_add_request_core((q), (rq), (q)->queue_head.prev, (p)); \
else \
_elv_add_request_core((q), (rq), &(q)->queue_head, (p)); \
} while (0)
#define elv_add_request(q, rq, back) _elv_add_request((q), (rq), (back), 1)
#if defined(MAJOR_NR) || defined(IDE_DRIVER)
/*
* Add entries as needed.
*/
#ifdef IDE_DRIVER
#define DEVICE_NR(device) (minor(device) >> PARTN_BITS)
#define DEVICE_NAME "ide"
#elif (MAJOR_NR == RAMDISK_MAJOR)
/* ram disk */
#define DEVICE_NAME "ramdisk"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == Z2RAM_MAJOR)
/* Zorro II Ram */
#define DEVICE_NAME "Z2RAM"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == FLOPPY_MAJOR)
static void floppy_off(unsigned int nr);
#define DEVICE_NAME "floppy"
#define DEVICE_INTR do_floppy
#define DEVICE_NR(device) ( (minor(device) & 3) | ((minor(device) & 0x80 ) >> 5 ))
#elif (MAJOR_NR == HD_MAJOR)
/* Hard disk: timeout is 6 seconds. */
#define DEVICE_NAME "hard disk"
#define DEVICE_INTR do_hd
#define DEVICE_NR(device) (minor(device)>>6)
#elif (SCSI_DISK_MAJOR(MAJOR_NR))
#define DEVICE_NAME "scsidisk"
#define DEVICE_NR(device) (((major(device) & SD_MAJOR_MASK) << (8 - 4)) + (minor(device) >> 4))
/* Kludge to use the same number for both char and block major numbers */
#elif (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
#define DEVICE_NAME "Multiple devices driver"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == SCSI_TAPE_MAJOR)
#define DEVICE_NAME "scsitape"
#define DEVICE_INTR do_st
#define DEVICE_NR(device) (minor(device) & 0x7f)
#elif (MAJOR_NR == OSST_MAJOR)
#define DEVICE_NAME "onstream"
#define DEVICE_INTR do_osst
#define DEVICE_NR(device) (minor(device) & 0x7f)
#elif (MAJOR_NR == SCSI_CDROM_MAJOR)
#define DEVICE_NAME "CD-ROM"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == XT_DISK_MAJOR)
#define DEVICE_NAME "xt disk"
#define DEVICE_NR(device) (minor(device) >> 6)
#elif (MAJOR_NR == PS2ESDI_MAJOR)
#define DEVICE_NAME "PS/2 ESDI"
#define DEVICE_NR(device) (minor(device) >> 6)
#elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
#define DEVICE_NAME "CDU31A"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == ACSI_MAJOR) && (defined(CONFIG_ATARI_ACSI) || defined(CONFIG_ATARI_ACSI_MODULE))
#define DEVICE_NAME "ACSI"
#define DEVICE_INTR do_acsi
#define DEVICE_NR(device) (minor(device) >> 4)
#elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
#define DEVICE_NAME "Mitsumi CD-ROM"
/* #define DEVICE_INTR do_mcd */
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
#define DEVICE_NAME "Mitsumi CD-ROM"
/* #define DEVICE_INTR do_mcdx */
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
#define DEVICE_NAME "Matsushita CD-ROM controller #1"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
#define DEVICE_NAME "Matsushita CD-ROM controller #2"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
#define DEVICE_NAME "Matsushita CD-ROM controller #3"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
#define DEVICE_NAME "Matsushita CD-ROM controller #4"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
#define DEVICE_NAME "Aztech CD-ROM"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == CDU535_CDROM_MAJOR)
#define DEVICE_NAME "SONY-CDU535"
#define DEVICE_INTR do_cdu535
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
#define DEVICE_NAME "Goldstar R420"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == CM206_CDROM_MAJOR)
#define DEVICE_NAME "Philips/LMS CD-ROM cm206"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
#define DEVICE_NAME "DOLPHIN 8000AT CD-ROM"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == SANYO_CDROM_MAJOR)
#define DEVICE_NAME "Sanyo H94A CD-ROM"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == APBLOCK_MAJOR)
#define DEVICE_NAME "apblock"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == DDV_MAJOR)
#define DEVICE_NAME "ddv"
#define DEVICE_NR(device) (minor(device)>>PARTN_BITS)
#elif (MAJOR_NR == MFM_ACORN_MAJOR)
#define DEVICE_NAME "mfm disk"
#define DEVICE_INTR do_mfm
#define DEVICE_NR(device) (minor(device) >> 6)
#elif (MAJOR_NR == NBD_MAJOR)
#define DEVICE_NAME "nbd"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == MDISK_MAJOR)
#define DEVICE_NAME "mdisk"
#define DEVICE_NR(device) (minor(device))
#elif (MAJOR_NR == DASD_MAJOR)
#define DEVICE_NAME "dasd"
#define DEVICE_NR(device) (minor(device) >> PARTN_BITS)
#elif (MAJOR_NR == I2O_MAJOR)
#define DEVICE_NAME "I2O block"
#define DEVICE_NR(device) (minor(device)>>4)
#elif (MAJOR_NR == COMPAQ_SMART2_MAJOR)
#define DEVICE_NAME "ida"
#define DEVICE_NR(device) (minor(device) >> 4)
#endif /* MAJOR_NR == whatever */
#if (MAJOR_NR != SCSI_TAPE_MAJOR) && (MAJOR_NR != OSST_MAJOR)
#if !defined(IDE_DRIVER)
#ifndef CURRENT
#define CURRENT elv_next_request(&blk_dev[MAJOR_NR].request_queue)
#endif
#ifndef QUEUE
#define QUEUE (&blk_dev[MAJOR_NR].request_queue)
#endif
#ifndef QUEUE_EMPTY
#define QUEUE_EMPTY blk_queue_empty(QUEUE)
#endif
#ifndef DEVICE_NAME
#define DEVICE_NAME "unknown"
#endif
#define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
#ifdef DEVICE_INTR
static void (*DEVICE_INTR)(void) = NULL;
#endif
#define SET_INTR(x) (DEVICE_INTR = (x))
#ifdef DEVICE_INTR
#define CLEAR_INTR SET_INTR(NULL)
#else
#define CLEAR_INTR
#endif
#define INIT_REQUEST \
if (QUEUE_EMPTY) { \
CLEAR_INTR; \
return; \
} \
if (major(CURRENT->rq_dev) != MAJOR_NR) \
panic(DEVICE_NAME ": request list destroyed"); \
if (!CURRENT->bio) \
panic(DEVICE_NAME ": no bio"); \
#endif /* !defined(IDE_DRIVER) */
/*
* If we have our own end_request, we do not want to include this mess
*/
#ifndef LOCAL_END_REQUEST
static inline void end_request(int uptodate)
{
struct request *req = CURRENT;
if (end_that_request_first(req, uptodate, CURRENT->hard_cur_sectors))
return;
add_blkdev_randomness(major(req->rq_dev));
blkdev_dequeue_request(req);
end_that_request_last(req);
}
#endif /* !LOCAL_END_REQUEST */
#endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) */
#endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */
#endif /* _BLK_H */
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