4 #include <linux/blkdev.h>
5 #include <linux/locks.h>
6 #include <linux/config.h>
9 * NR_REQUEST is the number of entries in the request-queue.
10 * NOTE that writes may use only the low 2/3 of these: reads
16 * This is used in the elevator algorithm. We don't prioritise reads
17 * over writes any more --- although reads are more time-critical than
18 * writes, by treating them equally we increase filesystem throughput.
19 * This turns out to give better overall performance. -- sct
21 #define IN_ORDER(s1,s2) \
22 ((s1)->rq_dev < (s2)->rq_dev || (((s1)->rq_dev == (s2)->rq_dev && \
23 (s1)->sector < (s2)->sector)))
26 * These will have to be changed to be aware of different buffer
27 * sizes etc.. It actually needs a major cleanup.
29 #if defined(IDE_DRIVER) || defined(MD_DRIVER)
30 #define SECTOR_MASK ((BLOCK_SIZE >> 9) - 1)
32 #define SECTOR_MASK (blksize_size[MAJOR_NR] && \
33 blksize_size[MAJOR_NR][MINOR(CURRENT->rq_dev)] ? \
34 ((blksize_size[MAJOR_NR][MINOR(CURRENT->rq_dev)] >> 9) - 1) : \
35 ((BLOCK_SIZE >> 9) - 1))
36 #endif /* IDE_DRIVER */
38 #define SUBSECTOR(block) (CURRENT->current_nr_sectors > 0)
40 extern int cdrom_init(void);
42 #ifdef CONFIG_ISP16_CDI
43 extern int isp16_init(void);
44 #endif CONFIG_ISP16_CDI
46 extern int cdu31a_init(void);
48 #ifdef CONFIG_ATARI_ACSI
49 extern int acsi_init(void);
50 #endif CONFIG_ATARI_ACSI
52 extern int mcd_init(void);
55 extern int mcdx_init(void);
58 extern int sbpcd_init(void);
61 extern int aztcd_init(void);
64 extern int sony535_init(void);
67 extern int gscd_init(void);
70 extern int cm206_init(void);
73 extern int optcd_init(void);
76 extern int sjcd_init(void);
78 #ifdef CONFIG_CDI_INIT
79 extern int cdi_init(void);
80 #endif CONFIG_CDI_INIT
81 #ifdef CONFIG_BLK_DEV_HD
82 extern int hd_init(void);
84 #ifdef CONFIG_BLK_DEV_IDE
85 extern int ide_init(void);
87 #ifdef CONFIG_BLK_DEV_XD
88 extern int xd_init(void);
90 #ifdef CONFIG_BLK_DEV_LOOP
91 extern int loop_init(void);
93 #ifdef CONFIG_BLK_DEV_MD
94 extern int md_init(void);
95 #endif CONFIG_BLK_DEV_MD
97 extern int ap_init(void);
100 extern int ddv_init(void);
102 #ifdef CONFIG_AMIGA_Z2RAM
103 extern int z2_init(void);
105 #ifdef CONFIG_MAC_FLOPPY
106 extern int swim3_init(void);
109 extern void set_device_ro(kdev_t dev
,int flag
);
110 void add_blkdev_randomness(int major
);
112 extern int floppy_init(void);
113 extern void rd_load(void);
114 extern int rd_init(void);
115 extern int rd_doload
; /* 1 = load ramdisk, 0 = don't load */
116 extern int rd_prompt
; /* 1 = prompt for ramdisk, 0 = don't prompt */
117 extern int rd_image_start
; /* starting block # of image */
119 #ifdef CONFIG_BLK_DEV_INITRD
121 #define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
123 extern unsigned long initrd_start
,initrd_end
;
124 extern int mount_initrd
; /* zero if initrd should not be mounted */
125 extern int initrd_below_start_ok
; /* 1 if it is not an error if initrd_start < memory_start */
126 void initrd_init(void);
129 #ifdef CONFIG_BLK_DEV_PS2
130 extern int ps2esdi_init(void);
133 #define RO_IOCTLS(dev,where) \
134 case BLKROSET: { int __val; if (!suser()) return -EACCES; \
135 if (get_user(__val, (int *)(where))) return -EFAULT; \
136 set_device_ro((dev),__val); return 0; } \
137 case BLKROGET: { int __val = (is_read_only(dev) != 0) ; \
138 return put_user(__val,(int *) (where)); }
140 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
143 * Add entries as needed.
148 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
149 #define DEVICE_ON(device) /* nothing */
150 #define DEVICE_OFF(device) /* nothing */
152 #elif (MAJOR_NR == RAMDISK_MAJOR)
155 #define DEVICE_NAME "ramdisk"
156 #define DEVICE_REQUEST rd_request
157 #define DEVICE_NR(device) (MINOR(device))
158 #define DEVICE_ON(device)
159 #define DEVICE_OFF(device)
160 #define DEVICE_NO_RANDOM
162 #elif (MAJOR_NR == Z2RAM_MAJOR)
165 #define DEVICE_NAME "Z2RAM"
166 #define DEVICE_REQUEST do_z2_request
167 #define DEVICE_NR(device) (MINOR(device))
168 #define DEVICE_ON(device)
169 #define DEVICE_OFF(device)
171 #elif (MAJOR_NR == FLOPPY_MAJOR)
173 static void floppy_off(unsigned int nr
);
175 #define DEVICE_NAME "floppy"
176 #define DEVICE_INTR do_floppy
177 #define DEVICE_REQUEST do_fd_request
178 #define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))
179 #define DEVICE_ON(device)
180 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
182 #elif (MAJOR_NR == HD_MAJOR)
184 /* harddisk: timeout is 6 seconds.. */
185 #define DEVICE_NAME "harddisk"
186 #define DEVICE_INTR do_hd
187 #define DEVICE_TIMEOUT HD_TIMER
188 #define TIMEOUT_VALUE (6*HZ)
189 #define DEVICE_REQUEST do_hd_request
190 #define DEVICE_NR(device) (MINOR(device)>>6)
191 #define DEVICE_ON(device)
192 #define DEVICE_OFF(device)
194 #elif (MAJOR_NR == SCSI_DISK_MAJOR)
196 #define DEVICE_NAME "scsidisk"
197 #define DEVICE_INTR do_sd
198 #define TIMEOUT_VALUE (2*HZ)
199 #define DEVICE_REQUEST do_sd_request
200 #define DEVICE_NR(device) (MINOR(device) >> 4)
201 #define DEVICE_ON(device)
202 #define DEVICE_OFF(device)
204 /* Kludge to use the same number for both char and block major numbers */
205 #elif (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
207 #define DEVICE_NAME "Multiple devices driver"
208 #define DEVICE_REQUEST do_md_request
209 #define DEVICE_NR(device) (MINOR(device))
210 #define DEVICE_ON(device)
211 #define DEVICE_OFF(device)
213 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
215 #define DEVICE_NAME "scsitape"
216 #define DEVICE_INTR do_st
217 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
218 #define DEVICE_ON(device)
219 #define DEVICE_OFF(device)
221 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
223 #define DEVICE_NAME "CD-ROM"
224 #define DEVICE_INTR do_sr
225 #define DEVICE_REQUEST do_sr_request
226 #define DEVICE_NR(device) (MINOR(device))
227 #define DEVICE_ON(device)
228 #define DEVICE_OFF(device)
230 #elif (MAJOR_NR == XT_DISK_MAJOR)
232 #define DEVICE_NAME "xt disk"
233 #define DEVICE_REQUEST do_xd_request
234 #define DEVICE_NR(device) (MINOR(device) >> 6)
235 #define DEVICE_ON(device)
236 #define DEVICE_OFF(device)
238 #elif (MAJOR_NR == PS2ESDI_MAJOR)
240 #define DEVICE_NAME "PS/2 ESDI"
241 #define DEVICE_REQUEST do_ps2esdi_request
242 #define DEVICE_NR(device) (MINOR(device) >> 6)
243 #define DEVICE_ON(device)
244 #define DEVICE_OFF(device)
246 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
248 #define DEVICE_NAME "CDU31A"
249 #define DEVICE_REQUEST do_cdu31a_request
250 #define DEVICE_NR(device) (MINOR(device))
251 #define DEVICE_ON(device)
252 #define DEVICE_OFF(device)
254 #elif (MAJOR_NR == ACSI_MAJOR) && (defined(CONFIG_ATARI_ACSI) || defined(CONFIG_ATARI_ACSI_MODULE))
256 #define DEVICE_NAME "ACSI"
257 #define DEVICE_INTR do_acsi
258 #define DEVICE_REQUEST do_acsi_request
259 #define DEVICE_NR(device) (MINOR(device) >> 4)
260 #define DEVICE_ON(device)
261 #define DEVICE_OFF(device)
263 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
265 #define DEVICE_NAME "Mitsumi CD-ROM"
266 /* #define DEVICE_INTR do_mcd */
267 #define DEVICE_REQUEST do_mcd_request
268 #define DEVICE_NR(device) (MINOR(device))
269 #define DEVICE_ON(device)
270 #define DEVICE_OFF(device)
272 #elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
274 #define DEVICE_NAME "Mitsumi CD-ROM"
275 /* #define DEVICE_INTR do_mcdx */
276 #define DEVICE_REQUEST do_mcdx_request
277 #define DEVICE_NR(device) (MINOR(device))
278 #define DEVICE_ON(device)
279 #define DEVICE_OFF(device)
281 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
283 #define DEVICE_NAME "Matsushita CD-ROM controller #1"
284 #define DEVICE_REQUEST do_sbpcd_request
285 #define DEVICE_NR(device) (MINOR(device))
286 #define DEVICE_ON(device)
287 #define DEVICE_OFF(device)
289 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
291 #define DEVICE_NAME "Matsushita CD-ROM controller #2"
292 #define DEVICE_REQUEST do_sbpcd2_request
293 #define DEVICE_NR(device) (MINOR(device))
294 #define DEVICE_ON(device)
295 #define DEVICE_OFF(device)
297 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
299 #define DEVICE_NAME "Matsushita CD-ROM controller #3"
300 #define DEVICE_REQUEST do_sbpcd3_request
301 #define DEVICE_NR(device) (MINOR(device))
302 #define DEVICE_ON(device)
303 #define DEVICE_OFF(device)
305 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
307 #define DEVICE_NAME "Matsushita CD-ROM controller #4"
308 #define DEVICE_REQUEST do_sbpcd4_request
309 #define DEVICE_NR(device) (MINOR(device))
310 #define DEVICE_ON(device)
311 #define DEVICE_OFF(device)
313 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
315 #define DEVICE_NAME "Aztech CD-ROM"
316 #define DEVICE_REQUEST do_aztcd_request
317 #define DEVICE_NR(device) (MINOR(device))
318 #define DEVICE_ON(device)
319 #define DEVICE_OFF(device)
321 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
323 #define DEVICE_NAME "SONY-CDU535"
324 #define DEVICE_INTR do_cdu535
325 #define DEVICE_REQUEST do_cdu535_request
326 #define DEVICE_NR(device) (MINOR(device))
327 #define DEVICE_ON(device)
328 #define DEVICE_OFF(device)
330 #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
332 #define DEVICE_NAME "Goldstar R420"
333 #define DEVICE_REQUEST do_gscd_request
334 #define DEVICE_NR(device) (MINOR(device))
335 #define DEVICE_ON(device)
336 #define DEVICE_OFF(device)
338 #elif (MAJOR_NR == CM206_CDROM_MAJOR)
339 #define DEVICE_NAME "Philips/LMS cd-rom cm206"
340 #define DEVICE_REQUEST do_cm206_request
341 #define DEVICE_NR(device) (MINOR(device))
342 #define DEVICE_ON(device)
343 #define DEVICE_OFF(device)
345 #elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
347 #define DEVICE_NAME "DOLPHIN 8000AT CD-ROM"
348 #define DEVICE_REQUEST do_optcd_request
349 #define DEVICE_NR(device) (MINOR(device))
350 #define DEVICE_ON(device)
351 #define DEVICE_OFF(device)
353 #elif (MAJOR_NR == SANYO_CDROM_MAJOR)
355 #define DEVICE_NAME "Sanyo H94A CD-ROM"
356 #define DEVICE_REQUEST do_sjcd_request
357 #define DEVICE_NR(device) (MINOR(device))
358 #define DEVICE_ON(device)
359 #define DEVICE_OFF(device)
361 #elif (MAJOR_NR == APBLOCK_MAJOR)
363 #define DEVICE_NAME "apblock"
364 #define DEVICE_REQUEST ap_request
365 #define DEVICE_NR(device) (MINOR(device))
366 #define DEVICE_ON(device)
367 #define DEVICE_OFF(device)
369 #elif (MAJOR_NR == DDV_MAJOR)
371 #define DEVICE_NAME "ddv"
372 #define DEVICE_REQUEST ddv_request
373 #define DEVICE_NR(device) (MINOR(device)>>PARTN_BITS)
374 #define DEVICE_ON(device)
375 #define DEVICE_OFF(device)
377 #endif /* MAJOR_NR == whatever */
379 #if (MAJOR_NR != SCSI_TAPE_MAJOR)
380 #if !defined(IDE_DRIVER)
383 #define CURRENT (blk_dev[MAJOR_NR].current_request)
386 #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
389 static void (*DEVICE_INTR
)(void) = NULL
;
391 #ifdef DEVICE_TIMEOUT
394 ((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \
395 (timer_active |= 1<<DEVICE_TIMEOUT))
397 #define CLEAR_TIMER \
398 timer_active &= ~(1<<DEVICE_TIMEOUT)
400 #define SET_INTR(x) \
401 if ((DEVICE_INTR = (x)) != NULL) \
408 #define SET_INTR(x) (DEVICE_INTR = (x))
410 #endif /* DEVICE_TIMEOUT */
412 static void (DEVICE_REQUEST
)(void);
415 #define CLEAR_INTR SET_INTR(NULL)
420 #define INIT_REQUEST \
425 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \
426 panic(DEVICE_NAME ": request list destroyed"); \
428 if (!buffer_locked(CURRENT->bh)) \
429 panic(DEVICE_NAME ": block not locked"); \
432 #endif /* !defined(IDE_DRIVER) */
434 /* end_request() - SCSI devices have their own version */
435 /* - IDE drivers have their own copy too */
437 #if ! SCSI_BLK_MAJOR(MAJOR_NR)
439 #if defined(IDE_DRIVER) && !defined(_IDE_C) /* shared copy for IDE modules */
440 void ide_end_request(byte uptodate
, ide_hwgroup_t
*hwgroup
);
444 void ide_end_request(byte uptodate
, ide_hwgroup_t
*hwgroup
) {
445 struct request
*req
= hwgroup
->rq
;
447 static void end_request(int uptodate
) {
448 struct request
*req
= CURRENT
;
449 #endif /* IDE_DRIVER */
450 struct buffer_head
* bh
;
455 printk("end_request: I/O error, dev %s, sector %lu\n",
456 kdevname(req
->rq_dev
), req
->sector
);
457 if ((bh
= req
->bh
) != NULL
) {
458 nsect
= bh
->b_size
>> 9;
460 req
->nr_sectors
&= ~(nsect
- 1);
461 req
->sector
+= nsect
;
462 req
->sector
&= ~(nsect
- 1);
466 if ((bh
= req
->bh
) != NULL
) {
467 req
->bh
= bh
->b_reqnext
;
468 bh
->b_reqnext
= NULL
;
469 bh
->b_end_io(bh
, uptodate
);
470 if ((bh
= req
->bh
) != NULL
) {
471 req
->current_nr_sectors
= bh
->b_size
>> 9;
472 if (req
->nr_sectors
< req
->current_nr_sectors
) {
473 req
->nr_sectors
= req
->current_nr_sectors
;
474 printk("end_request: buffer-list destroyed\n");
476 req
->buffer
= bh
->b_data
;
480 #ifndef DEVICE_NO_RANDOM
481 add_blkdev_randomness(MAJOR(req
->rq_dev
));
484 hwgroup
->drive
->queue
= req
->next
;
485 blk_dev
[MAJOR(req
->rq_dev
)].current_request
= NULL
;
488 DEVICE_OFF(req
->rq_dev
);
490 #endif /* IDE_DRIVER */
491 if (req
->sem
!= NULL
)
493 req
->rq_status
= RQ_INACTIVE
;
494 wake_up(&wait_for_request
);
496 #endif /* defined(IDE_DRIVER) && !defined(_IDE_C) */
497 #endif /* ! SCSI_BLK_MAJOR(MAJOR_NR) */
498 #endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) */
500 #endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */